refactor

README.md

@@ -1,4 +1,4 @@
-# dotSCAD 2.2
+# dotSCAD 2.2.1
 
 > **Reduce the burden of 3D modeling in mathematics.**
 
@@ -95,6 +95,7 @@ See [examples](examples).
 	- [ellipse_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-ellipse_extrude.html)
     - [stereographic_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-stereographic_extrude.html)
 	- [rounded_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-rounded_extrude.html)
+	- [bend_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-bend_extrude.html)	
 
 - 2D Shape
     - [shape_taiwan](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_taiwan.html)
@@ -111,7 +112,6 @@ See [examples](examples).
 	- [shape_path_extend](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_path_extend.html)		
 
 - 2D Shape Extrusion
-	- [bend_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-bend_extrude.html)
 	- [path_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-path_extrude.html)
 	- [ring_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-ring_extrude.html)
 	- [helix_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-helix_extrude.html)

RELEASE.md

@@ -1,5 +1,13 @@
 > Version numbers are based on [Semantic Versioning](https://semver.org/).
 
+# v2.2.1
+Bugfixes:
+- `util/sort`: z not sorted.
+
+Improvements:
+- Faster when the `style` of `function_grapher` is `"LINES"` or `"HULL_LINES"`.
+- Dedup pixels of `pixel/px_polyline`, `pixel/px_circle`, `pixel/px_cylinder`, `pixel/px_sphere`, `pixel/px_polygon`.
+
 # v2.2
 - Bugfixes
   - `util/sort`: fix "search term not found" warning when `by` is `"idx"`.

docs/lib2x-polyline3d.md

@@ -6,7 +6,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates.
 
 - `points` : The list of `[x, y, z]` points of the polyline. The points are indexed from 0 to n-1.
 - `thickness` : The line thickness.
-- `startingStyle` : The end-cap style of the starting point. The value must be `"CAP_BUTT"`, `"CAP_CIRCLE"` or `"CAP_SPHERE"`. The default value is `"CAP_CIRCL"`. 
+- `startingStyle` : The end-cap style of the starting point. The value must be `"CAP_BUTT"`, `"CAP_CIRCLE"` or `"CAP_SPHERE"`. The default value is `"CAP_CIRCLE"`. 
 - `endingStyle` : The end-cap style of the ending point. The value must be `"CAP_BUTT"`, `"CAP_CIRCLE"` or `"CAP_SPHERE"`. The default value is `"CAP_CIRCLE"`.
 - `$fa`, `$fs`, `$fn` : Used by the `circle` or `sphere` module internally. Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) or [the sphere module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#sphere) for more details. The final fragments of a circle will be a multiple of 4 to fit edges if possible.
 

docs/lib2x-px_gray.md

@@ -73,7 +73,7 @@ I provide a tool [img2gray](https://github.com/JustinSDK/img2gray) for convertin
 
 After converting the image, use the data in the text file as the `levels` value of `pixel_gray`, you can build a model like this:
 
-    include <pixel/px_gray.scad>;
+    use <pixel/px_gray.scad>;
 
     levels = [
         [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 

docs/lib2x-ring_extrude.md

@@ -11,7 +11,7 @@ If your 2D shape is not solid, indexes of triangles are required. See [polysecti
 - `shape_pts` : A list of points represent a shape. See the example below.
 - `radius` : The circle radius.
 - `angle` : Defaults to 360. Specifies the number of degrees to sweep, starting at the positive X axis. It also accepts a 2 element vector which defines the central angle. The first element of the vector is the beginning angle in degrees, and the second element is the ending angle.
-- `twist` : The number of degrees of through which the shape is extruded.
+- `twist` : The number of degrees of through which the shape is twisted.
 - `scale` : Scales the 2D shape by this value over the length of the extrusion. Scale can be a scalar or a vector.
 - `triangles` : `"SOLID"` (default), `"HOLLOW"` or user-defined indexes. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 - `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.

docs/lib2x-shape_cyclicpolygon.md

@@ -4,7 +4,7 @@ Returns shape points of a regular cyclic polygon. They can be used with xxx_extr
 
 ## Parameters
 
-- `sides` : The radius of the circle.
+- `sides` : The sides of the circle.
 - `circle_r` : The radius of the circumcircle.
 - `corner_r` : The radius of the circle at a corner.
 - `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.

docs/lib2x-voronoi2d.md

@@ -19,10 +19,7 @@ Creats a [Voronoi diagram](https://en.wikipedia.org/wiki/Voronoi_diagram). The i
 
     use <voronoi2d.scad>;
 
-    xs = rands(-20, 20, 50);
-    ys = rands(-20, 20, 50);
-
-    points = [for(i = [0:len(xs) - 1]) [xs[i], ys[i]]];
+    points = [for(i = [0:50]) rands(-20, 20, 2)];
 
     voronoi2d(points);
     translate([60, 0, 0]) 

examples/dot_photo_sphere.scad

@@ -0,0 +1,125 @@
+use <pixel/px_gray.scad>;
+use <experimental/ptf_sphere.scad>;
+
+photo_size = [100, 100];
+radius = 50;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 153, 162, 152, 97, 82, 120, 155, 66, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 146, 146, 131, 118, 96, 75, 46, 46, 191, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 139, 130, 117, 99, 78, 53, 38, 64, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 108, 102, 95, 74, 60, 38, 47, 89, 85, 153, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 101, 77, 67, 52, 38, 48, 82, 109, 73, 48, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 70, 40, 42, 57, 84, 107, 92, 62, 38, 164, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 215, 100, 89, 102, 115, 91, 72, 44, 47, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 112, 114, 102, 86, 68, 51, 41, 66, 101, 94, 140, 194, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 156, 93, 80, 65, 51, 36, 59, 97, 100, 69, 49, 110, 93, 223, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 222, 70, 54, 47, 45, 69, 96, 110, 91, 58, 40, 92, 76, 70, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 225, 222, 141, 104, 111, 140, 144, 109, 77, 41, 49, 87, 64, 42, 197, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 221, 227, 223, 224, 228, 227, 220, 166, 129, 116, 46, 74, 89, 42, 40, 155, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 224, 224, 224, 227, 223, 169, 130, 129, 129, 88, 100, 58, 37, 62, 176, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 226, 226, 226, 226, 216, 134, 130, 127, 130, 118, 76, 42, 54, 92, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 226, 223, 228, 225, 228, 221, 182, 131, 131, 129, 128, 112, 41, 56, 95, 182, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 202, 212, 209, 212, 220, 225, 225, 153, 129, 125, 127, 130, 120, 86, 118, 208, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 197, 210, 197, 164, 255, 255, 255, 255, 255, 255, 255, 42, 6, 4, 0, 3, 1, 2, 2, 0, 4, 3, 2, 16, 87, 154, 134, 157, 150, 144, 112, 80, 120, 175, 102, 72, 76, 79, 81, 77, 79, 75, 77, 72, 68, 62, 61, 56, 55, 53, 53, 66, 72, 79, 84, 51, 22, 10, 6, 1, 3, 4, 2, 5, 1, 1, 0, 0, 2, 6, 2, 39, 96, 139, 163, 152, 127, 80, 169, 215, 180, 100, 9, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 211, 183, 151, 191, 255, 255, 255, 255, 220, 10, 1, 1, 1, 3, 0, 1, 0, 2, 0, 1, 6, 80, 181, 165, 141, 135, 116, 112, 92, 64, 117, 99, 109, 66, 58, 56, 65, 60, 63, 63, 62, 58, 55, 53, 52, 53, 58, 62, 69, 74, 84, 81, 22, 2, 6, 2, 2, 3, 1, 3, 0, 0, 1, 1, 0, 1, 3, 5, 97, 117, 176, 149, 134, 121, 97, 71, 125, 163, 122, 55, 37, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 218, 192, 156, 117, 255, 255, 255, 255, 158, 1, 0, 0, 1, 0, 0, 2, 2, 1, 2, 0, 35, 113, 89, 81, 88, 108, 74, 69, 61, 75, 120, 138, 104, 112, 15, 56, 55, 53, 54, 51, 53, 56, 56, 60, 60, 66, 74, 82, 89, 94, 73, 14, 6, 8, 2, 2, 4, 1, 4, 0, 6, 7, 1, 5, 0, 1, 18, 135, 103, 143, 117, 123, 104, 86, 67, 74, 129, 80, 98, 15, 138, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 210, 187, 160, 106, 142, 255, 255, 255, 104, 1, 5, 1, 2, 0, 3, 1, 0, 0, 5, 3, 71, 154, 123, 102, 67, 88, 78, 79, 97, 117, 148, 173, 105, 5, 8, 64, 185, 121, 77, 72, 71, 73, 77, 82, 86, 91, 96, 100, 109, 64, 9, 5, 4, 1, 2, 1, 2, 0, 2, 5, 0, 0, 2, 1, 2, 37, 201, 144, 99, 80, 69, 86, 84, 72, 77, 109, 148, 153, 53, 20, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 223, 201, 181, 144, 96, 117, 255, 255, 255, 79, 4, 1, 1, 5, 0, 1, 0, 2, 0, 5, 2, 128, 207, 186, 153, 106, 45, 20, 32, 74, 81, 31, 9, 2, 7, 88, 255, 255, 255, 199, 146, 107, 99, 99, 95, 107, 108, 117, 117, 85, 6, 3, 2, 1, 5, 2, 0, 0, 1, 1, 4, 0, 1, 4, 4, 77, 202, 182, 104, 169, 144, 120, 79, 94, 84, 95, 121, 120, 28, 0, 127, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 204, 187, 163, 124, 79, 139, 255, 255, 255, 18, 1, 4, 1, 0, 2, 4, 1, 0, 5, 0, 16, 178, 255, 219, 185, 115, 71, 1, 0, 1, 3, 3, 3, 19, 148, 255, 255, 255, 255, 255, 255, 255, 224, 203, 172, 175, 159, 163, 155, 17, 4, 5, 0, 0, 0, 0, 1, 0, 4, 2, 1, 2, 0, 2, 83, 216, 199, 160, 113, 217, 191, 151, 86, 4, 1, 0, 2, 1, 5, 48, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 213, 255, 255, 255, 255, 255, 255, 225, 212, 198, 181, 160, 127, 89, 77, 193, 255, 255, 255, 19, 1, 0, 0, 1, 0, 5, 0, 1, 3, 0, 34, 201, 255, 255, 189, 108, 38, 1, 1, 2, 0, 2, 52, 201, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 131, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 5, 0, 1, 6, 128, 208, 196, 179, 132, 133, 255, 212, 158, 81, 3, 0, 1, 0, 4, 69, 214, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 208, 193, 199, 208, 206, 205, 198, 193, 180, 166, 149, 123, 87, 73, 138, 217, 255, 255, 255, 104, 0, 1, 1, 3, 1, 2, 9, 0, 0, 5, 36, 193, 226, 211, 169, 107, 2, 7, 0, 6, 6, 75, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 2, 4, 80, 194, 185, 173, 149, 104, 145, 255, 210, 147, 62, 4, 6, 2, 0, 74, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 205, 186, 168, 154, 151, 140, 120, 95, 70, 86, 139, 143, 125, 255, 255, 255, 118, 4, 2, 1, 1, 6, 0, 0, 1, 0, 0, 35, 141, 165, 167, 113, 72, 2, 0, 3, 8, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 165, 4, 1, 1, 1, 0, 0, 1, 1, 1, 0, 3, 1, 7, 76, 95, 149, 156, 147, 123, 89, 143, 206, 181, 111, 36, 3, 0, 6, 73, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 214, 177, 136, 105, 81, 113, 145, 156, 88, 84, 255, 255, 255, 197, 4, 3, 1, 1, 1, 1, 1, 4, 0, 5, 23, 130, 85, 91, 110, 5, 6, 2, 32, 196, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 71, 9, 1, 1, 0, 0, 0, 0, 1, 1, 3, 0, 2, 46, 151, 172, 140, 132, 117, 97, 65, 121, 122, 127, 72, 3, 1, 5, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 204, 188, 165, 145, 120, 82, 69, 182, 255, 255, 255, 64, 2, 4, 1, 0, 6, 1, 0, 3, 0, 10, 133, 139, 134, 30, 3, 2, 72, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 2, 1, 1, 0, 0, 0, 0, 1, 1, 0, 6, 7, 113, 140, 120, 120, 91, 88, 66, 73, 126, 97, 108, 42, 2, 5, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 210, 196, 179, 161, 138, 118, 83, 60, 141, 255, 255, 255, 255, 100, 29, 3, 1, 1, 1, 0, 6, 2, 4, 56, 121, 33, 5, 6, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 6, 4, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 48, 103, 73, 69, 112, 68, 64, 78, 108, 150, 162, 73, 6, 15, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 211, 199, 186, 169, 154, 135, 106, 159, 213, 169, 203, 255, 255, 255, 255, 255, 219, 152, 93, 41, 9, 0, 0, 0, 8, 2, 3, 20, 159, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 168, 0, 2, 1, 0, 0, 1, 1, 1, 1, 1, 0, 5, 97, 157, 141, 104, 89, 71, 95, 106, 135, 94, 22, 7, 14, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 218, 207, 199, 187, 176, 162, 147, 126, 114, 255, 255, 170, 113, 135, 255, 255, 255, 255, 255, 255, 255, 255, 255, 179, 100, 48, 11, 4, 57, 209, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 6, 164, 204, 176, 133, 65, 3, 3, 2, 0, 7, 3, 15, 199, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 226, 228, 227, 224, 222, 216, 209, 204, 196, 185, 174, 163, 153, 134, 115, 151, 255, 209, 157, 103, 67, 216, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 94, 0, 1, 2, 0, 3, 1, 0, 2, 0, 1, 1, 25, 220, 255, 203, 147, 63, 7, 0, 1, 2, 8, 35, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 215, 211, 211, 203, 209, 202, 196, 188, 178, 172, 165, 150, 138, 125, 105, 151, 255, 184, 133, 86, 66, 156, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 91, 5, 0, 0, 5, 2, 2, 5, 0, 0, 5, 0, 42, 255, 255, 200, 134, 46, 0, 2, 3, 2, 49, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 194, 182, 172, 197, 193, 185, 185, 174, 169, 161, 149, 145, 126, 114, 94, 131, 200, 162, 118, 79, 68, 129, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 93, 0, 0, 0, 3, 0, 0, 0, 2, 6, 0, 4, 52, 206, 210, 176, 98, 19, 5, 3, 0, 53, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 198, 111, 36, 182, 173, 177, 163, 164, 157, 143, 135, 129, 112, 101, 83, 82, 177, 135, 97, 62, 84, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 162, 0, 1, 3, 0, 1, 5, 0, 0, 4, 2, 2, 60, 141, 158, 129, 86, 2, 0, 6, 74, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 229, 143, 2, 165, 165, 159, 152, 63, 61, 135, 123, 115, 104, 89, 70, 59, 128, 113, 79, 66, 103, 160, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 196, 8, 0, 0, 1, 2, 0, 4, 5, 0, 1, 0, 48, 124, 81, 88, 45, 5, 3, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 164, 7, 111, 147, 146, 140, 41, 28, 123, 112, 99, 87, 75, 60, 63, 87, 89, 65, 80, 131, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 73, 2, 2, 0, 3, 0, 0, 2, 0, 3, 0, 38, 149, 142, 74, 0, 0, 103, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 44, 60, 132, 126, 129, 43, 11, 103, 96, 90, 73, 61, 62, 71, 100, 90, 93, 128, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 107, 46, 11, 0, 2, 4, 0, 0, 1, 2, 8, 100, 50, 5, 14, 136, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255] 
+];
+
+dots = px_gray(levels, center = true, normalize = true);
+
+color("white")
+    for(dot = dots) {   
+        translate(ptf_sphere(photo_size, dot[0] + photo_size / 2, radius, [180, 180])) 
+            square(dot[1] * 2.5);
+    }
+    
+rotate([180, 0, 0])
+color("white")
+    for(dot = dots) {   
+        translate(ptf_sphere(photo_size, dot[0] + photo_size / 2, radius, [180, 180])) 
+            square(dot[1] * 2.5);
+    }
+    
+color("black") 
+    sphere(50);

examples/hollow_out/hollow_out_cylinder.scad

@@ -0,0 +1,41 @@
+use <hull_polyline3d.scad>;
+use <experimental/tri_delaunay.scad>;
+use <experimental/tri_bisectors.scad>;
+use <experimental/ptf_bend.scad>;
+
+size = [100, 40];
+pt_nums = 20;
+thickness = 1;
+radius = 15;
+fn = 12;
+
+xs = rands(0, size[0], pt_nums);
+ys = rands(0, size[1], pt_nums);
+half_fn = fn / 2;
+dx = size[0] / fn;
+dy = size[1] / half_fn;
+points = concat(
+    [
+        [0, 0], [size[0], 0], 
+        [size[0], size[1]], [0, size[1]]
+    ],
+    [for(i = [1:fn - 1]) [i * dx, 0]],
+    [for(i = [1:fn - 1]) [i * dx, size[1]]],
+    [for(i = [1:half_fn - 1]) [0, dy * i]],
+    [for(i = [1:half_fn - 1]) [size[0], dy * i]],    
+    [for(i = [0:len(xs) - 1]) [xs[i], ys[i]]]
+);   
+
+bisectors = [
+    for(tri = tri_delaunay(points)) 
+    each tri_bisectors([points[tri[0]], points[tri[1]], points[tri[2]]])
+];
+
+for(line = bisectors) {
+    pts = [for(p = line) ptf_bend(size, p, radius, 360)];
+    hull_polyline3d(
+        concat(pts, [pts[0]]), 
+        thickness = thickness,
+        $fn = 4
+    );
+}

examples/hollow_out/hollow_out_holder.scad

@@ -0,0 +1,27 @@
+use <hull_polyline3d.scad>;
+use <experimental/ptf_bend.scad>;
+use <hollow_out_square.scad>;
+
+width = 5;
+columns = 30;
+rows = 15;
+radius = 30;
+angle = 360;
+thickness = 2;
+    
+lines = concat(
+    hollow_out_square([columns, rows], width),
+    [[
+        for(x = [0:width:width * columns]) [x, rows * width]
+    ]]
+);
+
+for(line = lines) {  
+   transformed = [for(pt = line) ptf_bend([columns * width, rows * width], pt, radius, angle)];
+   hull_polyline3d(transformed, thickness, $fn = 4);
+}
+
+translate([0, 0, -thickness / 2])
+linear_extrude(thickness)
+rotate(180 / columns)
+    circle(radius + thickness / 2, $fn = columns);

examples/hollow_out/hollow_out_square.scad

@@ -0,0 +1,31 @@
+use <util/rand.scad>;
+use <experimental/tri_bisectors.scad>;
+
+function h_lines_in_square(width) = 
+    let(
+        w = width / 2,
+        i = ceil(rand() * 10) % 2,
+        tris = i == 0 ? 
+                [
+                    [[0, 0], [width, 0], [width, width]],
+                    [[0, 0], [width, width], [0, width]]
+                ] 
+                :
+                [
+                    [[width, 0], [0, width], [0, 0]],
+                    [[width, 0], [width, width], [0, width]]
+                ]
+    )
+    concat(tri_bisectors(tris[0]), tri_bisectors(tris[1]));
+
+function hollow_out_square(size, width) =
+    let(
+        columns = size[0],
+        rows = size[1]
+    )
+    [
+        for(y = [0:width:width * rows - width])
+            for(x = [0:width:width * columns - width])
+                for(line = h_lines_in_square(width)) 
+                    [for(p = line) p + [x, y]] 
+    ];

examples/hollow_out/hollow_out_starburst.scad

@@ -0,0 +1,35 @@
+use <shape_starburst.scad>;
+use <hull_polyline3d.scad>;
+use <experimental/tri_bisectors.scad>;
+
+r1 = 30;
+r2 = 12;
+h = 10;
+n = 5;
+thickness = 1.75;
+half = true;
+
+module hollow_out_starburst(r1, r2, h, n, thickness, half = false) {
+    star = [for(p = shape_starburst(r1, r2, n)) [p[0], p[1], 0]];
+    leng = len(star);
+    tris = concat(
+        [for(i = [0:leng - 2]) [[0, 0, h], star[i], star[i + 1]]],
+        [[[0, 0, h], star[leng - 1], star[0]]]
+    );
+    
+    module half_star() {
+        for(tri = tris) {
+            hull_polyline3d(concat(tri, [tri[0]]), thickness = thickness);
+            for(line = tri_bisectors(tri)) {
+                hull_polyline3d(concat(line, [line[0]]), thickness = thickness);
+            }
+        }    
+    }
+    
+    half_star();
+    if(!half) {
+        mirror([0, 0, 1]) half_star();
+    }
+}
+
+hollow_out_starburst(r1, r2, h, n, thickness, half);

examples/hollow_out/hollow_out_torus.scad

@@ -0,0 +1,22 @@
+use <hull_polyline3d.scad>;
+use <experimental/ptf_torus.scad>;
+use <hollow_out_square.scad>;
+
+width = 5;
+columns = 10;
+rows = 30;
+radius = 30;
+thickness = 2;
+twist = 0;
+
+lines = hollow_out_square([columns, rows], width);
+
+for(line = lines) {  
+   transformed = [for(pt = line) ptf_torus([columns * width, rows * width], pt, [radius, radius / 2], twist = twist)];
+   hull_polyline3d(transformed, thickness, $fn = 4);
+}
+
+color("black")
+rotate_extrude($fn = 36)
+translate([radius * 1.5, 0, 0])
+    circle(radius / 2);

examples/hollow_out/hollow_out_vase.scad

@@ -0,0 +1,65 @@
+use <hull_polyline3d.scad>;
+use <bezier_curve.scad>;
+use <rotate_p.scad>;
+use <paths2sections.scad>;
+use <experimental/hollow_out_sweep.scad>;
+use <experimental/tri_bisectors.scad>;
+
+t_step = 0.1;
+width = 3;
+fn = 18;
+line_style = "HULL_LINES"; // [LINES, HULL_LINES]
+
+p0 = [30, 0, 0];
+p1 = [80, 0, 50];
+p2 = [0, 0, 60];
+p3 = [25, 0, 120];
+p4 = [35, 0, 130];
+
+hollow_out_vase([p0, p1, p2, p3, p4], t_step, width, fn, line_style);
+
+module hollow_out_vase(ctrl_pts, t_step, width, fn, line_style) {
+    bezier = bezier_curve(t_step, 
+        ctrl_pts
+    );
+    
+    fpt = ctrl_pts[len(ctrl_pts) - 1];
+
+    a_step = 360 / fn;
+    sects = paths2sections([
+        for(a = [0:a_step:360 - a_step])
+        [for(p = bezier) rotate_p(p, [0, 0, a])]
+    ]);
+    
+    // body
+    hollow_out_sweep(sects, thickness = width, style = line_style, $fn = 4);
+
+    leng_sect = len(sects[0]);
+
+    // bottom
+    fst_sect = sects[0];
+    fst_tris = concat(
+        [for(i = [0:leng_sect - 2]) [[0, 0, 0], fst_sect[i], fst_sect[i + 1]]],
+        [[[0, 0, 0], fst_sect[leng_sect - 1], fst_sect[0]]]
+    );
+    for(tri = fst_tris) {
+        lines = tri_bisectors(tri);
+        for(line = lines) {
+            hull_polyline3d(line, thickness = width, $fn = 4);
+        }
+        hull_polyline3d([lines[2][1], [0, 0, 0]], thickness = width, $fn = 4);
+    }
+
+    // mouth
+    lst_sect = sects[len(sects) - 1];
+    lst_tris = concat(
+        [for(i = [0:leng_sect - 2]) [[0, 0, fpt[2]], lst_sect[i], lst_sect[i + 1]]],
+        [[[0, 0,  fpt[2]], lst_sect[leng_sect - 1], lst_sect[0]]]
+    );
+    dangling_pts = [for(tri = lst_tris) tri_bisectors(tri)[1][1]];
+    offset_z = [0, 0, width];
+    for(i = [0: leng_sect - 1]) {
+       hull_polyline3d([lst_sect[i] + offset_z, dangling_pts[i]], thickness = width, $fn = 4);
+       hull_polyline3d([lst_sect[(i + 1) % leng_sect] + offset_z, dangling_pts[i]], thickness = width, $fn = 4);   
+    }
+}

examples/hollow_out/hollow_torus_knot.scad

@@ -0,0 +1,50 @@
+use <torus_knot.scad>;
+use <cross_sections.scad>;
+use <circle_path.scad>;
+use <shape_pentagram.scad>;
+use <experimental/tri_bisectors.scad>;
+use <experimental/hollow_out_sweep.scad>;
+
+p = 2;
+q = 3;
+phi_step = 0.075;
+thickness = .1;
+section_style = "STAR";    // [STAR, CIRCLE]
+line_style = "HULL_LINES"; // [LINES, HULL_LINES]
+
+if(section_style == "STAR") {
+    hollow_out_torus_knot(shape_pentagram(.5), p, q, phi_step, thickness, line_style);
+}
+else {
+    hollow_out_torus_knot(circle_path(radius = .5, $fn = 12), p, q, phi_step, thickness, line_style);
+}
+
+module hollow_out_torus_knot(shape, p, q, phi_step, thickness, line_style) {
+    function angy_angz(p1, p2) = 
+        let(
+            dx = p2[0] - p1[0],
+            dy = p2[1] - p1[1],
+            dz = p2[2] - p1[2],
+            ya = atan2(dz, sqrt(dx * dx + dy * dy)),
+            za = atan2(dy, dx)
+        ) [ya, za];
+
+    function sects_by_path(shape, path) =
+        let(
+            lines = [
+                for(i = [0:len(path) - 2])
+                [path[i], path[i + 1]]
+            ],
+            angles = [
+                for(line = lines)
+                let(a = angy_angz(line[0], line[1]))
+                [0, 90 - a[0], a[1]]
+            ]
+        )
+       cross_sections(shape, path, concat([angles[0]], angles));
+    
+    pts = torus_knot(p, q, phi_step);
+    sects = sects_by_path(shape, pts);
+
+    hollow_out_sweep(sects, thickness, closed = true, style = line_style);
+}

examples/maze/circle_maze.scad

@@ -0,0 +1,33 @@
+use <hull_polyline2d.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
+use <experimental/ptf_circle.scad>;
+
+module circle_maze(start, r_blocks, block_width, wall_thickness, origin_offset) {
+    double_r_blocks = r_blocks * 2;
+    blocks = mz_blocks(
+        start,  
+        double_r_blocks, double_r_blocks
+    );
+
+    width = double_r_blocks * block_width;
+    walls = mz_walls(blocks, double_r_blocks, double_r_blocks, block_width);
+    
+    half_width =  width / 2;
+    offset = is_undef(origin_offset) ? [-half_width, -half_width] : origin_offset;
+    
+    for(wall = walls) {
+        for(i = [0:len(wall) - 2]) {
+            p0 = ptf_circle(wall[i], offset);
+            p1 = ptf_circle(wall[i + 1], offset);
+            hull_polyline2d([p0, p1], width = wall_thickness);
+        }
+    } 
+}
+
+circle_maze(
+    start = [1, 1], 
+    r_blocks = 5, 
+    block_width = 2, 
+    wall_thickness = .75
+);

examples/maze/cube_maze.scad

@@ -3,7 +3,7 @@ use <square_maze.scad>;
 maze_rows = 8;
 block_width = 2;
 wall_thickness = 1;
-inner_cube = false;
+inner_cube = true;
 travel_all = true;
 
 module cube_maze(maze_rows, block_width, wall_thickness, inner_cube, travel_all) {
@@ -20,17 +20,8 @@ module cube_maze(maze_rows, block_width, wall_thickness, inner_cube, travel_all)
     module two_mazes() {
         module one_maze() {
             translate([origin, origin, half_cube_size]) 
-                linear_extrude(wall_thickness) build_square_maze(
-                    maze_rows, 
-                    maze_rows, 
-                    go_maze(
-                        1, 1,   // starting point
-                        starting_maze(maze_rows, maze_rows),  
-                        maze_rows, maze_rows
-                    ), 
-                    block_width, 
-                    wall_thickness
-                );
+            linear_extrude(wall_thickness) 
+                square_maze([1, 1], maze_rows, block_width, wall_thickness);
         }
 
         one_maze();  

examples/maze/cylinder_maze.scad

@@ -1,5 +1,6 @@
 use <bend.scad>;
-use <square_maze.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
 
 radius = 30; 
 height = 60;
@@ -11,8 +12,7 @@ wall_top_scale = 0.25;
 
 fn = 24;
 
-module build_ramp_maze(rows, columns, blocks, block_width, wall_thickness, wall_height, wall_top_scale) {
-
+module cylinder_maze() {
     module ramp_line(point1, point2, width = 1, height = 1, top_scale = 0.25) {
         angle = 90 - atan((point2[1] - point1[1]) / (point2[0] - point1[0]));
         offset_x = 0.5 * width * cos(angle);
@@ -32,61 +32,26 @@ module build_ramp_maze(rows, columns, blocks, block_width, wall_thickness, wall_
         }
     }
 
-    module draw_ramp_block(block, block_width, wall_thickness, wall_height, wall_top_scale) {
-        translate([get_x(block) - 1, get_y(block) - 1] * block_width) {
-            if(upper_wall(block) || upper_right_wall(block)) {
-                ramp_line(
-                    [0, block_width], [block_width, block_width], wall_thickness, wall_height, wall_top_scale
-                ); 
-            }
-
-            if(right_wall(block) || upper_right_wall(block)) {
-                ramp_line(
-                    [block_width, block_width], [block_width, 0], wall_thickness, wall_height, wall_top_scale
-                ); 
-            }
-        }
-    }
-
-    for(block = blocks) {        
-        draw_ramp_block(
-            block, 
-            block_width, 
-            wall_thickness,
-            wall_height,
-            wall_top_scale
-        );
-    }
-
-    ramp_line(
-        [0, 0], [block_width * columns, 0], 
-        wall_thickness, wall_height, wall_top_scale
-    );
-} 
-
-module cylinder_maze() {
     maze_rows = round(height / block_width);
     maze_columns = round(2 * 3.14159 * radius / block_width);
 
-    maze_blocks = go_maze(
-        1, maze_rows,   
-        starting_maze(maze_rows, maze_columns),  
+    maze_blocks = mz_blocks(
+        [1, maze_rows],  
         maze_rows, maze_columns,
         x_circular = true
     );
-    
+
+    walls = mz_walls(maze_blocks, maze_rows, maze_columns, block_width, left_border = false);
+
     leng_circumference = block_width * maze_columns + wall_thickness;
 
     bend(size = [leng_circumference, block_width * maze_rows + wall_thickness, wall_height], angle = 360 + 360 * wall_thickness / leng_circumference, frags = fn) 
-        translate([0, wall_thickness / 2, 0]) build_ramp_maze(
-            maze_rows, 
-            maze_columns, 
-            maze_blocks, 
-            block_width, 
-            wall_thickness,
-            wall_height,
-            wall_top_scale
-        );
+    translate([0, wall_thickness / 2])
+        for(wall = walls) {
+            for(i = [0:len(wall) - 2]) {
+                ramp_line(wall[i], wall[i + 1], wall_thickness, wall_height, wall_top_scale);
+            }
+        }
 }
 
 cylinder_maze();

examples/maze/euler_maze.scad

@@ -1,5 +1,6 @@
 use <line2d.scad>;
 use <arc.scad>;
+use <util/rand.scad>;
 
 number_of_circles = 15;
 minimum_radius = 3;
@@ -36,7 +37,7 @@ module euler_maze(n, r, d, width = 1) {
         line2d(p3, p4, width = width, p1Style = "CAP_ROUND", p2Style = "CAP_ROUND");  
                    
         if(n != 0) {
-            rand_a = rands(15, 180, 15)[0];
+            rand_a = rand(15, 180);
             angle_between_gap = rand_a - gap_angle;         
             twoGapsCircle(outer_r, d, 
                 gap_angle,

examples/maze/heart2heart_maze.scad

@@ -1,6 +1,6 @@
 use <arc.scad>;
-use <square_maze.scad>;
 use <heart_maze.scad>;
+use <experimental/mz_blocks.scad>;
 
 names = ["Justin", "Monica"];
 font_name = "Arial Black";
@@ -31,9 +31,9 @@ module heart_base(name, font_name, font_size, radius, ring_thickness, tip_r_of_h
 }
 
 module heart2heart_maze(names, font_name, font_size, radius_of_heart, tip_r_of_heart, wall_thickness, cblocks, levels, spacing) {
-    maze = go_maze(1, 1, 
-        starting_maze(cblocks, levels),
-        cblocks, levels, y_circular = true
+    maze = mz_blocks(
+	    [1, 1],  
+	    cblocks, levels, y_circular = true
     );
 
     translate([0, 0, wall_thickness])

examples/maze/heart_maze.scad

@@ -1,8 +1,9 @@
 use <line2d.scad>;
 use <hollow_out.scad>;
-use <square_maze.scad>;
 use <ellipse_extrude.scad>;
 use <arc.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_get.scad>;
 
 radius_of_heart = 12;
 height_of_heart = 25;
@@ -58,6 +59,15 @@ module heart_to_heart_wall(radius, length, angle, thickness) {
 }
 
 module heart_maze(maze, radius, cblocks, levels, thickness = 1) {    
+	function no_wall(block) = get_wall_type(block) == "NO_WALL";
+	function upper_wall(block) = get_wall_type(block) == "UPPER_WALL";
+	function right_wall(block) = get_wall_type(block) == "RIGHT_WALL";
+	function upper_right_wall(block) = get_wall_type(block) == "UPPER_RIGHT_WALL";
+
+	function get_x(block) = mz_get(block, "x"); 
+	function get_y(block) = mz_get(block, "y");
+	function get_wall_type(block) = mz_get(block, "w");
+	
     arc_angle = 360 / cblocks;
 	r = radius / (levels + 1);
 
@@ -96,8 +106,8 @@ module heart_maze(maze, radius, cblocks, levels, thickness = 1) {
 	}
 }
 
-maze = go_maze(1, 1, 
-	starting_maze(cblocks, levels),
+maze = mz_blocks(
+	[1, 1],  
 	cblocks, levels, y_circular = true
 );
 

examples/maze/mobius_maze.scad

@@ -1,7 +1,7 @@
 use <hull_polyline3d.scad>;
-use <rotate_p.scad>;
-use <square_maze.scad>;
-use <twisted_maze.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
+use <experimental/ptf_ring.scad>;
 
 rows = 48;
 columns = 8;
@@ -14,14 +14,16 @@ leng = rows * block_width;
 radius = 0.5 * leng / PI;
 a_step = 360 / leng;
 
-blocks = go_maze( 
-    1, 1,   // starting point
-    starting_maze(rows, columns),  
-    rows, columns, y_circular = true
+blocks = mz_blocks(
+    [1, 1],  
+    rows, columns, 
+    y_circular = true
 );
-walls = maze_walls(blocks, rows, columns, block_width, bottom_border = false);
 
-for(wall_pts = y_twist(walls, angle, rows, columns, block_width)) {  
-   z_rotated = [for(pt = wall_pts) rotate_p([radius + pt[0], 0, pt[2]], a_step * pt[1])];
-   hull_polyline3d(z_rotated, wall_thickness);
+walls = mz_walls(blocks, rows, columns, block_width, bottom_border = false);
+
+size = [columns * block_width, rows * block_width];
+for(wall_pts = walls) {  
+   transformed = [for(pt = wall_pts) ptf_ring(size, pt, radius, 360, angle)];
+   hull_polyline3d(transformed, wall_thickness);
 }

examples/maze/pyramid_maze.scad

@@ -10,26 +10,15 @@ module pyramid_maze(maze_rows, block_width, wall_thickness) {
         linear_extrude(height, scale = 0) 
             square(leng, center = true);
     }
-
-    maze_blocks = go_maze(
-        1, 1,   // starting point
-        starting_maze(maze_rows, maze_rows),  
-        maze_rows, maze_rows
-    ); 
-   
+    
     leng = maze_rows * block_width ;
     half_leng = leng / 2;
     
     intersection() {
         linear_extrude(leng * 2) 
-        translate([-half_leng, -half_leng]) build_square_maze(
-            maze_rows, 
-            maze_rows, 
-            maze_blocks, 
-            block_width, 
-            wall_thickness
-        );
-        
+        translate([-half_leng, -half_leng]) 
+            square_maze([1, 1], maze_rows, block_width, wall_thickness);
+
         pyramid(leng + wall_thickness);
     }
 }

examples/maze/random_scala.scad

@@ -0,0 +1,27 @@
+use <experimental/mz_hamiltonian.scad>;
+
+module random_scala(rows, columns, start, width, height) {
+    line = mz_hamiltonian(rows, columns, start);
+    leng = len(line);
+    
+    for(i = [0:leng - 1]) {
+        p1 = line[i];
+        translate(p1)
+        linear_extrude(height * i * 2 + height)
+            square(width + 0.01, center = true);
+            
+        p2 = line[(i + 1) % leng];
+        
+        translate(p1 + (p2 - p1) / 2)        
+        linear_extrude(height * (2 * i + 1) + height)
+            square(width + 0.01, center = true);
+    }
+}
+
+random_scala(
+    rows = 2, 
+    columns = 3,
+    start = [0, 0],
+    width = .5,
+    height = .25
+);

examples/maze/regular_polygon_maze.scad

@@ -1,6 +1,7 @@
 use <line2d.scad>;
 use <hollow_out.scad>;
-use <square_maze.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_get.scad>;
 
 // only for creating a small maze
 
@@ -36,13 +37,22 @@ module regular_polygon_to_polygon_wall(radius, length, angle, thickness, sides)
 }
 
 module regular_polygon_maze(radius, cblocks, levels, thickness = 1, sides) {    
+	function no_wall(block) = get_wall_type(block) == "NO_WALL";
+	function upper_wall(block) = get_wall_type(block) == "UPPER_WALL";
+	function right_wall(block) = get_wall_type(block) == "RIGHT_WALL";
+	function upper_right_wall(block) = get_wall_type(block) == "UPPER_RIGHT_WALL";
+
+	function get_x(block) = mz_get(block, "x"); 
+	function get_y(block) = mz_get(block, "y");
+	function get_wall_type(block) = mz_get(block, "w");
+
     arc_angle = 360 / cblocks;
 	r = radius / (levels + 1);
 	
-	maze = go_maze(1, 1, 
-        starting_maze(cblocks, levels),
-        cblocks, levels, y_circular = true
-    );
+	maze = mz_blocks(
+		[1, 1],  
+		cblocks, levels, y_circular = true
+	);
 
 	difference() {
 		render() union() {

examples/maze/sphere_maze.scad

@@ -0,0 +1,38 @@
+use <hull_polyline3d.scad>;
+use <matrix/m_rotation.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
+use <experimental/ptf_sphere.scad>;
+
+r = 10;
+rows = 24;
+columns = 18;
+block_width = 1;
+wall_thickness = .5;   
+pole_offset = block_width * 1.5;
+
+module sphere_maze() {
+    size = [rows * block_width, columns * block_width + pole_offset * 2];
+    blocks = mz_blocks(
+        [1, 1],  
+        rows, columns, 
+        y_circular = true
+    );
+
+    p_offset = [block_width * rows, pole_offset, 0];
+    mr = m_rotation(90);
+
+    walls = mz_walls(blocks, rows, columns, block_width, bottom_border = false);
+    for(wall_pts = walls) {  
+        rxpts = [
+            for(p = wall_pts) 
+                ptf_sphere(size, mr * [p[0], p[1], 0, 0] + p_offset, r)
+        ];
+        hull_polyline3d(rxpts, wall_thickness, $fn = 6);
+    }
+}
+
+sphere_maze();
+color("black") 
+rotate([0, 90, 0]) 
+    sphere(r);

examples/maze/square_maze.scad

@@ -1,355 +1,27 @@
-use <line2d.scad>;
-use <polyline2d.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
 
-// NO_WALL = 0;       
-// UPPER_WALL = 1;    
-// RIGHT_WALL = 2;    
-// UPPER_RIGHT_WALL = 3; 
-
-function no_wall(block) = get_wall_type(block) == 0;
-function upper_wall(block) = get_wall_type(block) == 1;
-function right_wall(block) = get_wall_type(block) == 2;
-function upper_right_wall(block) = get_wall_type(block) == 3;
-
-function block(x, y, wall_type, visited) = [x, y, wall_type, visited];
-function get_x(block) = block[0];
-function get_y(block) = block[1];
-function get_wall_type(block) = block[2];
-
-// create a starting maze for being visited later.
-function starting_maze(rows, columns) =  [
-    for(y = [1:rows]) 
-        for(x = [1:columns]) 
-            block(
-                x, y, 
-                // all blocks have upper and right walls
-                3, 
-                // unvisited
-                false 
-            )
-];
-
-// find out the index of a block with the position (x, y)
-function indexOf(x, y, maze, i = 0) =
-    i > len(maze) ? -1 : (
-        [get_x(maze[i]), get_y(maze[i])] == [x, y] ? i : 
-            indexOf(x, y, maze, i + 1)
+module square_maze(start, rows, block_width, wall_thickness) {
+    blocks = mz_blocks(
+        start,  
+        rows, rows
     );
 
-// is (x, y) visited?
-function visited(x, y, maze) = maze[indexOf(x, y, maze)][3];
+    walls = mz_walls(blocks, rows, rows, block_width);
 
-// is (x, y) visitable?
-function visitable(x, y, maze, rows, columns) = 
-    y > 0 && y <= rows &&     // y bound
-    x > 0 && x <= columns &&  // x bound
-    !visited(x, y, maze);     // unvisited
-
-// setting (x, y) as being visited
-function set_visited(x, y, maze) = [
-    for(b = maze) 
-        [x, y] == [get_x(b), get_y(b)] ? 
-            [x, y, get_wall_type(b), true] : b
-];
-    
-// 0(right)、1(upper)、2(left)、3(down)
-function rand_dirs() =
-    [
-        [0, 1, 2, 3],
-        [0, 1, 3, 2],
-        [0, 2, 1, 3],
-        [0, 2, 3, 1],
-        [0, 3, 1, 2],
-        [0, 3, 2, 1],
-        [1, 0, 2, 3],
-        [1, 0, 3, 2],
-        [1, 2, 0, 3],
-        [1, 2, 3, 0],
-        [1, 3, 0, 2],
-        [1, 3, 2, 0],
-        [2, 0, 1, 3],
-        [2, 0, 3, 1],
-        [2, 1, 0, 3],
-        [2, 1, 3, 0],
-        [2, 3, 0, 1],
-        [2, 3, 1, 0],
-        [3, 0, 1, 2],
-        [3, 0, 2, 1],
-        [3, 1, 0, 2],
-        [3, 1, 2, 0],
-        [3, 2, 0, 1],
-        [3, 2, 1, 0]
-    ][round(rands(0, 24, 1)[0])]; 
-
-// get x value by dir
-function next_x(x, dir, columns, circular) = 
-    let(nx = x + [1, 0, -1, 0][dir])
-    circular ? 
-        nx < 1 ? nx + columns : (
-            nx > columns ? nx % columns : nx
-        )
-        :
-        nx;
-    
-// get y value by dir
-function next_y(y, dir, rows, circular) = 
-    let(ny = y + [0, 1, 0, -1][dir])
-    circular ? 
-        ny < 1 ? ny + rows : (
-            ny > rows ? ny % rows : ny
-        )
-        :
-        ny;
-    
-// go right and carve the right wall
-function go_right_from(x, y, maze) = [
-    for(b = maze) [get_x(b), get_y(b)] == [x, y] ? (
-        upper_right_wall(b) ? 
-            [x, y, 1, visited(x, y, maze)] : 
-            [x, y, 0, visited(x, y, maze)]
-        
-    ) : b
-]; 
-
-// go up and carve the upper wall
-function go_up_from(x, y, maze) = [
-    for(b = maze) [get_x(b), get_y(b)] == [x, y] ? (
-        upper_right_wall(b) ? 
-            [x, y, 2, visited(x, y, maze)] :  
-            [x, y, 0, visited(x, y, maze)]
-        
-    ) : b
-]; 
-
-// go left and carve the right wall of the left block
-function go_left_from(x, y, maze, columns) = 
-    let(
-        x_minus_one = x - 1,
-        nx = x_minus_one < 1 ? x_minus_one + columns : x_minus_one
-    )
-    [
-        for(b = maze) [get_x(b), get_y(b)] == [nx, y] ? (
-            upper_right_wall(b) ? 
-                [nx, y, 1, visited(nx, y, maze)] : 
-                [nx, y, 0, visited(nx, y, maze)]
-        ) : b
-    ]; 
-
-// go down and carve the upper wall of the down block
-function go_down_from(x, y, maze, rows) = [
-    let(
-        y_minus_one = y - 1,
-        ny = y_minus_one < 1 ? y_minus_one + rows : y_minus_one
-    )
-    for(b = maze) [get_x(b), get_y(b)] == [x, ny] ? (
-        upper_right_wall(b) ? 
-            [x, ny, 2, visited(x, ny, maze)] : 
-            [x, ny, 0, visited(x, ny, maze)]
-    ) : b
-]; 
-
-// 0(right)、1(upper)、2(left)、3(down)
-function try_block(dir, x, y, maze, rows, columns) =
-    dir == 0 ? go_right_from(x, y, maze) : 
-    dir == 1 ? go_up_from(x, y, maze) : 
-    dir == 2 ? go_left_from(x, y, maze, columns) : 
-    /*dir 3*/  go_down_from(x, y, maze, rows);
-
-
-// find out visitable dirs from (x, y)
-function visitable_dirs_from(x, y, maze, rows, columns, x_circular, y_circular) = [
-    for(dir = [0, 1, 2, 3]) 
-        if(visitable(next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), maze, rows, columns)) 
-            dir
-];  
-    
-// go maze from (x, y)
-function go_maze(x, y, maze, rows, columns, x_circular = false, y_circular = false) = 
-    //  have visitable dirs?
-    len(visitable_dirs_from(x, y, maze, rows, columns, x_circular, y_circular)) == 0 ? 
-        set_visited(x, y, maze)      // road closed
-        : walk_around_from(          
-            x, y, 
-            rand_dirs(),             
-            set_visited(x, y, maze), 
-            rows, columns,
-            x_circular, y_circular
-        );
-
-// try four directions
-function walk_around_from(x, y, dirs, maze, rows, columns, x_circular, y_circular, i = 4) =
-    // all done?
-    i > 0 ? 
-        // not yet
-        walk_around_from(x, y, dirs, 
-            // try one direction
-            try_routes_from(x, y, dirs[4 - i], maze, rows, columns, x_circular, y_circular),  
-            rows, columns, 
-            x_circular, y_circular,
-            i - 1) 
-        : maze;
-        
-function try_routes_from(x, y, dir, maze, rows, columns, x_circular, y_circular) = 
-    // is the dir visitable?
-    visitable(next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), maze, rows, columns) ?     
-        // try the block 
-        go_maze(
-            next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), 
-            try_block(dir, x, y, maze, rows, columns),
-            rows, columns,
-            x_circular, y_circular
-        ) 
-        // road closed so return maze directly
-        : maze;   
-
-// ==========
-module build_square_maze(rows, columns, blocks, block_width, wall_thickness, left_border = true, bottom_border = true) {
-    module build_block(block, block_width, wall_thickness) {
-        translate([get_x(block) - 1, get_y(block) - 1] * block_width) {
-            if(upper_wall(block) || upper_right_wall(block)) {
-                // draw a upper wall
-                line2d(
-                    [0, block_width], [block_width, block_width], wall_thickness
-                ); 
-            }
-            
-            if(right_wall(block) || upper_right_wall(block)) {
-                // draw a right wall
-                line2d(
-                    [block_width, block_width], [block_width, 0], wall_thickness
-                ); 
+    for(wall = walls) {
+        for(i = [0:len(wall) - 2]) {
+            hull() {
+                translate(wall[i]) square(wall_thickness, center = true);
+                translate(wall[i + 1]) square(wall_thickness, center = true);
             }
         }
-    }
-    
-    for(block = blocks) {
-        build_block(
-            block, 
-            block_width, 
-            wall_thickness
-        );
-    }
-
-    if(left_border) {
-        line2d([0, 0], [0, block_width * rows], wall_thickness);
-    }
-
-    if(bottom_border) {
-        line2d([0, 0], [block_width * columns, 0], wall_thickness);
-    }
-}         
-
-// ==========
-
-module build_hex_maze(y_cells, x_cells, maze_vector, cell_radius, wall_thickness, left_border = true, bottom_border = true) {
-	function cell_position(x_cell, y_cell) =
-		let(
-			grid_h = 2 * cell_radius * sin(60),
-			grid_w = cell_radius + cell_radius * cos(60)
-		)
-		[grid_w * x_cell, grid_h * y_cell + (x_cell % 2 == 0 ? 0 : grid_h / 2), 0];
-
-    module hex_seg(begin, end) {
-		polyline2d(
-			[for(a = [begin:60:end]) 
-				[cell_radius * cos(a), cell_radius * sin(a)]], 
-			wall_thickness,
-			startingStyle = "CAP_ROUND", endingStyle = "CAP_ROUND"
-		);
-	}
-
-	module build_upper_right() { hex_seg(0, 60); }
-	module build_upper() { hex_seg(60, 120); }
-	module build_upper_left() { hex_seg(120, 180);	}		
-	module build_down_left() { hex_seg(180, 240); }
-	module build_down() { hex_seg(240, 300); }
-	module build_down_right() { hex_seg(300, 360); }	
-
-	module build_cell(block) {
-		module build_right_wall(x_cell) {
-			if(x_cell % 2 != 0) {
-				build_down_right();
-			}
-			else {
-				build_upper_right();
-			}
-		}
-
-		module build_row_wall(x_cell, y_cell) {
-			if(x_cell % 2 != 0) {
-				build_upper_right();
-				build_upper_left();
-			}
-			else {
-				build_down_right();
-			}
-		}
-
-		x = get_x(block) - 1;
-		y = get_y(block) - 1;
-
-		translate(cell_position(x, y)) {
-			build_row_wall(x, y); 
-
-			if(upper_wall(block) || upper_right_wall(block)) {
-				build_upper();
-			}
-			if(right_wall(block) || upper_right_wall(block)) {
-				build_right_wall(x);
-			}  
-		}
-		
-	}
-	
-	// create the wall of maze
-	for(block = maze_vector) {
-		build_cell(block);
-	}  
-
-    if(left_border) {
-		for(y = [0:y_cells - 1]) {
-			translate(cell_position(0, y)) {
-				build_upper_left();
-				build_down_left();
-			}
-		}
-	}
-
-    if(bottom_border) {
-		for(x = [0:x_cells - 1]) {
-			translate(cell_position(x, 0)) {
-				build_down();
-				if(x % 2 == 0) {
-					build_down_left();
-					build_down_right();
-				}
-			}
-		}	
-	}
+    } 
 }
 
-// ==========
-
-function block_walls(block, block_width) = 
-    let(
-        loc = [get_x(block) - 1, get_y(block) - 1] * block_width,
-        upper = upper_wall(block) || upper_right_wall(block) ? [[0, block_width] + loc, [block_width, block_width] + loc] : [],
-        right = right_wall(block) || upper_right_wall(block) ? [[block_width, block_width] + loc, [block_width, 0] + loc] : []
-    )
-    concat(upper, right); 
-  
-function maze_walls(blocks, rows, columns, block_width, left_border = true, bottom_border = true) = 
-    let(
-        left_walls = left_border ? [for(y = [0:rows - 1]) [[0, block_width * (y + 1)], [0, block_width * y]]] : [],
-        buttom_walls = bottom_border ? [for(x = [0:columns - 1]) [[block_width * x, 0], [block_width * (x + 1), 0]]] : []
-    )
-     concat(
-        [
-            for(block = blocks) 
-            let(pts = block_walls(block, block_width))
-            if(pts != []) pts
-        ]
-        , left_walls, buttom_walls
-    );
-
-// ==========
+square_maze(
+    start = [1, 1], 
+    rows = 10, 
+    block_width = 2, 
+    wall_thickness = 1
+);

examples/maze/step_pyramid_maze.scad

@@ -29,13 +29,7 @@ module pyramid_with_stairs(base_width, stairs_width, rows) {
     }
 }
 
-module step_pyramid_maze(maze_rows, block_width, stairs_width) {
-    maze_blocks = go_maze(
-        1, 1,   // starting point
-        starting_maze(maze_rows, maze_rows),  
-        maze_rows, maze_rows
-    ); 
-    
+module step_pyramid_maze(maze_rows, block_width, stairs_width) {    
     intersection() {
         pyramid_with_stairs(
             maze_rows * block_width, stairs_width, maze_rows);
@@ -46,13 +40,7 @@ module step_pyramid_maze(maze_rows, block_width, stairs_width) {
             
             translate([-(maze_rows * block_width) / 2, -(maze_rows * block_width) / 2, 0]) 
             difference() {
-                build_square_maze(
-                    maze_rows, 
-                    maze_rows, 
-                    maze_blocks, 
-                    block_width, 
-                    stairs_width
-                );
+                square_maze([1, 1], maze_rows, block_width, stairs_width);
 
                 // entry
                 translate([0, stairs_width]) 

examples/maze/stereographic_hex_maze.scad

@@ -1,5 +1,7 @@
+use <polyline2d.scad>;
 use <stereographic_extrude.scad>;
-use <square_maze.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_get.scad>;
 
 x_cells = 10;
 cell_radius = 20;
@@ -8,6 +10,102 @@ fn = 24;
 shadow = "YES"; // [YES, NO]
 wall_height = 1;
 
+module build_hex_maze(y_cells, x_cells, maze_vector, cell_radius, wall_thickness, left_border = true, bottom_border = true) {
+	function no_wall(block) = get_wall_type(block) == "NO_WALL";
+	function upper_wall(block) = get_wall_type(block) == "UPPER_WALL";
+	function right_wall(block) = get_wall_type(block) == "RIGHT_WALL";
+	function upper_right_wall(block) = get_wall_type(block) == "UPPER_RIGHT_WALL";
+
+	function get_x(block) = mz_get(block, "x"); 
+	function get_y(block) = mz_get(block, "y");
+	function get_wall_type(block) = mz_get(block, "w");
+
+	function cell_position(x_cell, y_cell) =
+		let(
+			grid_h = 2 * cell_radius * sin(60),
+			grid_w = cell_radius + cell_radius * cos(60)
+		)
+		[grid_w * x_cell, grid_h * y_cell + (x_cell % 2 == 0 ? 0 : grid_h / 2), 0];
+
+    module hex_seg(begin, end) {
+		polyline2d(
+			[for(a = [begin:60:end]) 
+				[cell_radius * cos(a), cell_radius * sin(a)]], 
+			wall_thickness,
+			startingStyle = "CAP_ROUND", endingStyle = "CAP_ROUND"
+		);
+	}
+
+	module build_upper_right() { hex_seg(0, 60); }
+	module build_upper() { hex_seg(60, 120); }
+	module build_upper_left() { hex_seg(120, 180);	}		
+	module build_down_left() { hex_seg(180, 240); }
+	module build_down() { hex_seg(240, 300); }
+	module build_down_right() { hex_seg(300, 360); }	
+
+	module build_cell(block) {
+		module build_right_wall(x_cell) {
+			if(x_cell % 2 != 0) {
+				build_down_right();
+			}
+			else {
+				build_upper_right();
+			}
+		}
+
+		module build_row_wall(x_cell, y_cell) {
+			if(x_cell % 2 != 0) {
+				build_upper_right();
+				build_upper_left();
+			}
+			else {
+				build_down_right();
+			}
+		}
+
+		x = get_x(block) - 1;
+		y = get_y(block) - 1;
+
+		translate(cell_position(x, y)) {
+			build_row_wall(x, y); 
+
+			if(upper_wall(block) || upper_right_wall(block)) {
+				build_upper();
+			}
+			if(right_wall(block) || upper_right_wall(block)) {
+				build_right_wall(x);
+			}  
+		}
+		
+	}
+	
+	// create the wall of maze
+	for(block = maze_vector) {
+		build_cell(block);
+	}  
+
+    if(left_border) {
+		for(y = [0:y_cells - 1]) {
+			translate(cell_position(0, y)) {
+				build_upper_left();
+				build_down_left();
+			}
+		}
+	}
+
+    if(bottom_border) {
+		for(x = [0:x_cells - 1]) {
+			translate(cell_position(x, 0)) {
+				build_down();
+				if(x % 2 == 0) {
+					build_down_left();
+					build_down_right();
+				}
+			}
+		}	
+	}
+}
+
 module hex_maze_stereographic_projection(x_cells, cell_radius, wall_thickness, fn, wall_height, shadow) {
     y_cells = round(0.866 * x_cells - 0.211);
 
@@ -22,7 +120,10 @@ module hex_maze_stereographic_projection(x_cells, cell_radius, wall_thickness, f
     pyramid_height = square_w / sqrt(2);
   
     // create a maze     
-    maze_vector = go_maze(1, 1, starting_maze(y_cells, x_cells), y_cells, x_cells);
+    maze_vector = mz_blocks(
+        [1, 1],  
+        y_cells, x_cells
+    );
 
     stereographic_extrude(square_w, $fn = fn) 
     translate([grid_w - square_w / 2, grid_h - square_w / 2, 0]) 

examples/maze/stereographic_square_maze.scad

@@ -9,23 +9,11 @@ shadow = "YES"; // [YES, NO]
 wall_height = 2;
 
 module stereographic_projection_maze2(maze_rows, block_width, wall_thickness, fn, wall_height, shadow) {
-    maze_blocks = go_maze(
-        1, 1,   // starting point
-        starting_maze(maze_rows, maze_rows),  
-        maze_rows, maze_rows
-    ); 
-
     length = block_width * maze_rows + wall_thickness;
     
     module maze() {
         translate([-block_width * maze_rows / 2, -block_width * maze_rows / 2, 0]) 
-            build_square_maze(
-                maze_rows, 
-                maze_rows, 
-                maze_blocks, 
-                block_width, 
-                wall_thickness
-            );
+            square_maze([1, 1], maze_rows, block_width, wall_thickness);
     }
     
     stereographic_extrude(shadow_side_leng = length, $fn = fn)

examples/maze/torus_maze.scad

@@ -0,0 +1,34 @@
+use <hull_polyline3d.scad>;
+use <experimental/ptf_torus.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
+
+rows = 36;
+columns = 12;
+block_width = 2;
+wall_thickness = 1;   
+angle = 180;
+twist = 360;
+
+leng = rows * block_width;
+radius = 0.5 * leng / PI;
+a_step = 360 / leng;
+
+blocks = mz_blocks(
+    [1, 1],  
+    rows, columns, 
+    x_circular = true, y_circular = true
+);
+
+walls = mz_walls(blocks, rows, columns, block_width, left_border = false, bottom_border = false);
+
+size = [columns * block_width, rows * block_width];
+for(wall_pts = walls) {  
+   transformed = [for(pt = wall_pts) ptf_torus(size, pt, [radius, radius / 2], twist = twist)];
+   hull_polyline3d(transformed, wall_thickness, $fn = 4);
+}
+
+color("black")
+rotate_extrude($fn = 36)
+translate([radius * 1.5, 0, 0])
+    circle(radius / 2);

examples/maze/twisted_maze.scad

@@ -1,6 +1,7 @@
 use <hull_polyline3d.scad>;
-use <rotate_p.scad>;
-use <square_maze.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_walls.scad>;
+use <experimental/ptf_y_twist.scad>;
 
 rows = 16;
 columns = 8;
@@ -9,30 +10,15 @@ wall_thickness = 1;
 angle = 180;
 // $fn = 24;
 
-function y_twist(walls, angle, rows, columns, block_width) = 
-    let(
-        x_offset = columns * block_width / 2,
-        x_centered = [
-            for(wall_pts = walls) 
-                [for(pt = wall_pts) [pt[0], pt[1], 0] + [-x_offset, 0, 0]]
-        ],
-        a_step = angle / (rows * block_width)
-    )
-    [
-        for(wall_pts = x_centered)    
-           [
-               for(pt = wall_pts)
-                   rotate_p(pt, [0, pt[1] * a_step, 0]) + [x_offset, 0, 0]
-           ]
-    ];
-
-blocks = go_maze( 
-    1, 1,   // starting point
-    starting_maze(rows, columns),  
+blocks = mz_blocks(
+    [1, 1],  
     rows, columns
 );
-    
-walls = maze_walls(blocks, rows, columns, block_width);
-for(wall_pts = y_twist(walls, angle, rows, columns, block_width)) {   
-   hull_polyline3d(wall_pts, wall_thickness);
+
+walls = mz_walls(blocks, rows, columns, block_width);
+
+size = [columns * block_width, rows * block_width];
+for(wall_pts = walls) {  
+   transformed = [for(pt = wall_pts) ptf_y_twist(size, pt, angle)];
+   hull_polyline3d(transformed, wall_thickness);
 }

examples/perlin_noise_cylinder.scad

@@ -0,0 +1,59 @@
+use <util/rand.scad>;
+use <experimental/pnoise2s.scad>;
+use <experimental/sf_solidify.scad>;
+use <experimental/ptf_bend.scad>;
+use <util/slice.scad>;
+
+radius = 40;
+height = 100;
+thickness_scale = 1;
+step = 4;
+
+module perlin_noise_cylinder(radius, height, thickness_scale, step) {
+    size = [2 * PI * radius, height];
+
+    surface_inside = [
+        for(y = [0:step:size[1]])
+            concat(
+                [
+                    for(x = [0:step:size[0] - 1])
+                    [x / 10, y / 10, 0] 
+                ],
+                [[size[0] / 10, y / 10, 0]]
+            )
+    ];
+
+    seed = rand(0, 256);
+    leng_row = len(surface_inside[0]);
+    surface_outside = [
+            for(ri = [0:len(surface_inside) - 1])
+                let(
+                    row = surface_inside[ri],
+                    row_for_noise = concat(slice(row, 0, leng_row - 1), [[0, row[leng_row - 1][1], 0]]),
+                    ns = pnoise2s(row_for_noise, seed)
+                )
+                [
+                    for(ci = [0:len(ns) - 1])
+                        [surface_inside[ri][ci][0], surface_inside[ri][ci][1], thickness_scale * (ns[ci] + 1)]
+                ]
+        ];
+
+    size_div_10 = size / 10;
+    radius_div_10 = radius / 10;
+    t_surface_outside = [
+            for(row = surface_outside)
+                [for(p = row)
+                    ptf_bend(size_div_10, p, radius_div_10, 360)
+                ]
+        ];
+    t_surface_inside = [
+        for(row = surface_inside)
+            [for(p = row)
+                ptf_bend(size_div_10, p, radius_div_10, 360)
+            ]
+    ];
+ 
+    sf_solidify(t_surface_outside, t_surface_inside);
+}
+
+perlin_noise_cylinder(radius, height, thickness_scale, step);

examples/photo_sphere.scad

@@ -0,0 +1,111 @@
+use <experimental/sf_sphere.scad>;
+
+radius = 50;
+thickness = 10;
+depth = 5;
+angle = [180, 180];
+invert = false;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 153, 162, 152, 97, 82, 120, 155, 66, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 146, 146, 131, 118, 96, 75, 46, 46, 191, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 139, 130, 117, 99, 78, 53, 38, 64, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 108, 102, 95, 74, 60, 38, 47, 89, 85, 153, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 101, 77, 67, 52, 38, 48, 82, 109, 73, 48, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 70, 40, 42, 57, 84, 107, 92, 62, 38, 164, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 215, 100, 89, 102, 115, 91, 72, 44, 47, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 112, 114, 102, 86, 68, 51, 41, 66, 101, 94, 140, 194, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 156, 93, 80, 65, 51, 36, 59, 97, 100, 69, 49, 110, 93, 223, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 222, 70, 54, 47, 45, 69, 96, 110, 91, 58, 40, 92, 76, 70, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 225, 222, 141, 104, 111, 140, 144, 109, 77, 41, 49, 87, 64, 42, 197, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 221, 227, 223, 224, 228, 227, 220, 166, 129, 116, 46, 74, 89, 42, 40, 155, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 224, 224, 224, 227, 223, 169, 130, 129, 129, 88, 100, 58, 37, 62, 176, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 226, 226, 226, 226, 216, 134, 130, 127, 130, 118, 76, 42, 54, 92, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 226, 223, 228, 225, 228, 221, 182, 131, 131, 129, 128, 112, 41, 56, 95, 182, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 202, 212, 209, 212, 220, 225, 225, 153, 129, 125, 127, 130, 120, 86, 118, 208, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 176, 176, 193, 191, 198, 201, 209, 134, 129, 128, 128, 127, 128, 185, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 154, 149, 152, 166, 168, 174, 181, 130, 128, 131, 131, 123, 128, 125, 189, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 142, 116, 123, 128, 138, 140, 145, 136, 128, 124, 131, 128, 130, 131, 133, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 206, 184, 224, 178, 158, 145, 108, 124, 131, 125, 130, 131, 129, 127, 130, 130, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 221, 226, 224, 222, 102, 100, 128, 131, 125, 127, 128, 128, 127, 129, 144, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 224, 227, 224, 194, 125, 117, 122, 128, 128, 124, 130, 128, 126, 129, 132, 145, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 213, 255, 255, 255, 255, 255, 255, 225, 212, 198, 181, 160, 127, 89, 77, 193, 255, 255, 255, 19, 1, 0, 0, 1, 0, 5, 0, 1, 3, 0, 34, 201, 255, 255, 189, 108, 38, 1, 1, 2, 0, 2, 52, 201, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 131, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 5, 0, 1, 6, 128, 208, 196, 179, 132, 133, 255, 212, 158, 81, 3, 0, 1, 0, 4, 69, 214, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 208, 193, 199, 208, 206, 205, 198, 193, 180, 166, 149, 123, 87, 73, 138, 217, 255, 255, 255, 104, 0, 1, 1, 3, 1, 2, 9, 0, 0, 5, 36, 193, 226, 211, 169, 107, 2, 7, 0, 6, 6, 75, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 2, 4, 80, 194, 185, 173, 149, 104, 145, 255, 210, 147, 62, 4, 6, 2, 0, 74, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 205, 186, 168, 154, 151, 140, 120, 95, 70, 86, 139, 143, 125, 255, 255, 255, 118, 4, 2, 1, 1, 6, 0, 0, 1, 0, 0, 35, 141, 165, 167, 113, 72, 2, 0, 3, 8, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 165, 4, 1, 1, 1, 0, 0, 1, 1, 1, 0, 3, 1, 7, 76, 95, 149, 156, 147, 123, 89, 143, 206, 181, 111, 36, 3, 0, 6, 73, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 214, 177, 136, 105, 81, 113, 145, 156, 88, 84, 255, 255, 255, 197, 4, 3, 1, 1, 1, 1, 1, 4, 0, 5, 23, 130, 85, 91, 110, 5, 6, 2, 32, 196, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 71, 9, 1, 1, 0, 0, 0, 0, 1, 1, 3, 0, 2, 46, 151, 172, 140, 132, 117, 97, 65, 121, 122, 127, 72, 3, 1, 5, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 204, 188, 165, 145, 120, 82, 69, 182, 255, 255, 255, 64, 2, 4, 1, 0, 6, 1, 0, 3, 0, 10, 133, 139, 134, 30, 3, 2, 72, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 2, 1, 1, 0, 0, 0, 0, 1, 1, 0, 6, 7, 113, 140, 120, 120, 91, 88, 66, 73, 126, 97, 108, 42, 2, 5, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 210, 196, 179, 161, 138, 118, 83, 60, 141, 255, 255, 255, 255, 100, 29, 3, 1, 1, 1, 0, 6, 2, 4, 56, 121, 33, 5, 6, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 6, 4, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 48, 103, 73, 69, 112, 68, 64, 78, 108, 150, 162, 73, 6, 15, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 211, 199, 186, 169, 154, 135, 106, 159, 213, 169, 203, 255, 255, 255, 255, 255, 219, 152, 93, 41, 9, 0, 0, 0, 8, 2, 3, 20, 159, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 168, 0, 2, 1, 0, 0, 1, 1, 1, 1, 1, 0, 5, 97, 157, 141, 104, 89, 71, 95, 106, 135, 94, 22, 7, 14, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 218, 207, 199, 187, 176, 162, 147, 126, 114, 255, 255, 170, 113, 135, 255, 255, 255, 255, 255, 255, 255, 255, 255, 179, 100, 48, 11, 4, 57, 209, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 6, 164, 204, 176, 133, 65, 3, 3, 2, 0, 7, 3, 15, 199, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 226, 228, 227, 224, 222, 216, 209, 204, 196, 185, 174, 163, 153, 134, 115, 151, 255, 209, 157, 103, 67, 216, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 94, 0, 1, 2, 0, 3, 1, 0, 2, 0, 1, 1, 25, 220, 255, 203, 147, 63, 7, 0, 1, 2, 8, 35, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 215, 211, 211, 203, 209, 202, 196, 188, 178, 172, 165, 150, 138, 125, 105, 151, 255, 184, 133, 86, 66, 156, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 91, 5, 0, 0, 5, 2, 2, 5, 0, 0, 5, 0, 42, 255, 255, 200, 134, 46, 0, 2, 3, 2, 49, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 194, 182, 172, 197, 193, 185, 185, 174, 169, 161, 149, 145, 126, 114, 94, 131, 200, 162, 118, 79, 68, 129, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 93, 0, 0, 0, 3, 0, 0, 0, 2, 6, 0, 4, 52, 206, 210, 176, 98, 19, 5, 3, 0, 53, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 198, 111, 36, 182, 173, 177, 163, 164, 157, 143, 135, 129, 112, 101, 83, 82, 177, 135, 97, 62, 84, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 162, 0, 1, 3, 0, 1, 5, 0, 0, 4, 2, 2, 60, 141, 158, 129, 86, 2, 0, 6, 74, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 229, 143, 2, 165, 165, 159, 152, 63, 61, 135, 123, 115, 104, 89, 70, 59, 128, 113, 79, 66, 103, 160, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 196, 8, 0, 0, 1, 2, 0, 4, 5, 0, 1, 0, 48, 124, 81, 88, 45, 5, 3, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 164, 7, 111, 147, 146, 140, 41, 28, 123, 112, 99, 87, 75, 60, 63, 87, 89, 65, 80, 131, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 73, 2, 2, 0, 3, 0, 0, 2, 0, 3, 0, 38, 149, 142, 74, 0, 0, 103, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 44, 60, 132, 126, 129, 43, 11, 103, 96, 90, 73, 61, 62, 71, 100, 90, 93, 128, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 107, 46, 11, 0, 2, 4, 0, 0, 1, 2, 8, 100, 50, 5, 14, 136, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_sphere(levels, radius, thickness, depth, angle, invert);

examples/tiled_line_mobius.scad

@@ -0,0 +1,40 @@
+use <util/rand.scad>;
+use <hull_polyline3d.scad>;
+use <experimental/ptf_ring.scad>;
+
+size = [20, 100];
+line_width = 1;
+step = 1; 
+twist = 180;
+$fn = 8;
+
+module tiled_line_mobius(size, twist, step, line_width = 1) {
+    sizexy = is_num(size) ? [size, size] : size;
+    s = is_undef(step) ? line_width * 2 : step;
+ 
+    function rand_diagonal_line_pts(x, y, size) = 
+        rand(0, 1) >= 0.5 ? [[x, y], [x + size, y + size]] : [[x + size, y], [x, y + size]];
+        
+    lines = concat(
+        [
+            for(x = [0:s:sizexy[0] - s]) 
+                for(y = [0:s:sizexy[1] - s]) 
+                    rand_diagonal_line_pts(x, y, s)
+        ],
+        [
+            for(i = [0:step:size[1] - 1])
+                [[0, i], [0, i + step]]
+        ],
+        [
+            for(i = [0:step:size[1] - 1])
+                [[size[0], i], [size[0], i + step]]
+        ]
+    );
+            
+    for(line = lines) {
+        pts = [for(p = line) ptf_ring(size, p, size[0], twist = twist)];
+        hull_polyline3d(pts, thickness = line_width);
+    }
+}
+
+tiled_line_mobius(size, twist, step, line_width);

examples/tiled_line_torus.scad

@@ -0,0 +1,36 @@
+use <util/rand.scad>;
+use <hull_polyline3d.scad>;
+use <experimental/ptf_torus.scad>;
+
+size = [20, 50];
+line_width = 1;
+step = 1; 
+twist = 180;
+$fn = 4;
+
+module tiled_line_torus(size, twist, step, line_width = 1) {
+    sizexy = is_num(size) ? [size, size] : size;
+    s = is_undef(step) ? line_width * 2 : step;
+ 
+    function rand_diagonal_line_pts(x, y, size) = 
+        rand(0, 1) >= 0.5 ? [[x, y], [x + size, y + size]] : [[x + size, y], [x, y + size]];
+        
+    lines = concat(
+        [
+            for(x = [0:s:sizexy[0] - s]) 
+                for(y = [0:s:sizexy[1] - s]) 
+                    rand_diagonal_line_pts(x, y, s)
+        ]
+    );
+            
+    for(line = lines) {
+        pts = [for(p = line) ptf_torus(size, p, [size[0], size[0] / 2], twist = twist)];
+        hull_polyline3d(pts, thickness = line_width);
+    }
+}
+
+tiled_line_torus(size, twist, step, line_width);
+color("black")
+rotate_extrude($fn = 36)
+translate([size[0] * 1.5, 0, 0])
+    circle(size[0] / 2);

examples/tiled_lines.scad

@@ -1,11 +1,12 @@
 use <line2d.scad>;
+use <util/rand.scad>;
 
-module tiled_lines(size, line_width = 1, step) {
+module tiled_lines(size, step, line_width = 1) {
     sizexy = is_num(size) ? [size, size] : size;
     s = is_undef(step) ? line_width * 2 : step;
  
     module rand_diagonal_line(x, y, size) {
-        if(rands(0, 1, 1)[0] >= 0.5) {
+        if(rand(0, 1) >= 0.5) {
             line2d([x, y], [x + size, y + size], width = line_width);
         } 
         else {
@@ -21,7 +22,7 @@ module tiled_lines(size, line_width = 1, step) {
 }
 
 size = [50, 25];
-line_width = 1;
 step = 2; 
+line_width = 1;
 
-tiled_lines(size, line_width, step);
+tiled_lines(size, step, line_width);

examples/voronoi/voronoi_penholder.scad

@@ -0,0 +1,53 @@
+use <hull_polyline2d.scad>;
+use <shape_square.scad>;
+use <hollow_out.scad>;
+use <bend_extrude.scad>;
+use <experimental/voronoi2d_cells.scad>;
+
+xy = [100, 40];
+pt_nums = 20;
+thickness = 2;
+
+voronoi_penholder(xy, pt_nums, thickness);
+
+module voronoi_penholder(xy, pt_nums, thickness) {
+    xs1 = rands(0, xy[0], pt_nums);
+    ys1 = rands(0, xy[1], pt_nums);
+    points = [for(i = [0:len(xs1) - 1]) [xs1[i], ys1[i]]];
+
+    cpts = concat(
+        [for(p = points) if(p[0] > xy[0] - 10) p + [-xy[0], 0]],
+        points,
+        [for(p = points) if(p[0] < 10) p + [xy[0], 0]]
+    );
+
+    function default_region_size(points) = 
+        let(
+            xs = [for(p = points) p[0]],
+            ys = [for(p = points) abs(p[1])]
+        )
+        max([(max(xs) -  min(xs) / 2), (max(ys) -  min(ys)) / 2]);
+
+    size = default_region_size(cpts);  
+    region_shape = shape_square(size, corner_r = size / 5);
+
+    cells = voronoi2d_cells(cpts, region_shape);
+    bend_extrude(size = [xy[0], xy[1]], thickness = thickness, angle = 360, $fn = 48) 
+    {
+        for(i = [0:len(cpts) - 1]) {
+            cell = cells[i];
+            hull_polyline2d(concat(cell, [cell[0]]), width = thickness);
+            
+        }
+    }
+
+    r = 0.5 * xy[0] / PI;
+
+    linear_extrude(thickness)
+        circle(r, $fn = 48);
+
+    translate([0, 0, xy[1]])    
+    linear_extrude(thickness)
+    hollow_out(shell_thickness = thickness)
+        circle(r, $fn = 48);
+}

src/_impl/_triangulate_impl.scad

@@ -19,9 +19,10 @@ function _triangulate_snipable(shape_pts, u, v, w, n, indices, epsilon = 0.0001)
         bx = b[0],
         by = b[1],
         cx = c[0],
-        cy = c[1]
+        cy = c[1],
+        determinant = cross([bx - ax, by - ay],  [cx - ax, cy - ay])
     )
-    epsilon > (((bx - ax) * (cy - ay)) - ((by - ay) * (cx - ax))) ? 
+    epsilon > determinant ? 
         false : _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices);
     
 function _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices, p = 0) = 

src/archimedean_spiral_extrude.scad

@@ -10,7 +10,7 @@
 
 use <archimedean_spiral.scad>;
 use <cross_sections.scad>;
-use <polysections.scad>;
+use <sweep.scad>;
 
 module archimedean_spiral_extrude(shape_pts, arm_distance, init_angle, point_distance, num_of_points, 
                                   rt_dir = "CT_CLK", twist = 0, scale = 1.0, triangles = "SOLID") {
@@ -32,7 +32,7 @@ module archimedean_spiral_extrude(shape_pts, arm_distance, init_angle, point_dis
 
     sections = cross_sections(shape_pts, points, angles, twist, scale);
 
-    polysections(
+    sweep(
         sections,
         triangles = triangles
     );

src/experimental/_impl/_convex_hull_impl.scad

@@ -0,0 +1,59 @@
+use <util/slice.scad>;
+
+function _convex_hull_lt_than_by_xy(p1, p2) =
+    p1[0] < p2[0] || (p1[0] == p2[0] && p1[1] < p2[1]);
+
+function _convex_hull_sort_by_xy(lt) = 
+    let(leng = len(lt))
+    leng <= 1 ? lt : 
+        let(
+            pivot = lt[0],
+            before = [for(j = 1; j < leng; j = j + 1) if(_convex_hull_lt_than_by_xy(lt[j], pivot)) lt[j]],
+            after =  [for(j = 1; j < leng; j = j + 1) if(!_convex_hull_lt_than_by_xy(lt[j], pivot)) lt[j]]
+        )
+        concat(_convex_hull_sort_by_xy(before), [pivot], _convex_hull_sort_by_xy(after));
+
+// oa->ob ct_clk : greater than 0
+function _convex_hull_impl_dir(o, a, b) =
+    let(
+        ox = o[0],
+        oy = o[1],
+        ax = a[0],
+        ay = a[1],
+        bx = b[0],
+        by = b[1]
+    )
+    (ax - ox) * (by - oy) - (ay - oy) * (bx - ox);
+
+function _convex_hull_convex_hull_lower_m(chain, p, m) = 
+    (m >= 2 && _convex_hull_impl_dir(chain[m - 2], chain[m - 1], p) <= 0) ? _convex_hull_convex_hull_lower_m(chain, p, m - 1) : m;
+
+function _convex_hull_lower_chain(points, leng, chain, m, i) =
+    i == leng ? chain : 
+        let(
+            current_m = _convex_hull_convex_hull_lower_m(chain, points[i], m)
+        )
+        _convex_hull_lower_chain(
+            points,
+            leng,
+            concat(slice(chain, 0, current_m), [points[i]]),
+            current_m + 1,
+            i + 1
+        );
+            
+function _convex_hull_upper_m(chain, p, m, t) =
+    (m >= t && _convex_hull_impl_dir(chain[m - 2], chain[m - 1], p) <= 0) ?
+        _convex_hull_upper_m(chain, p, m - 1, t) : m;
+        
+function _convex_hull_upper_chain(points, chain, m, t, i) =
+    i < 0 ? chain :
+        let(
+            current_m = _convex_hull_upper_m(chain, points[i], m, t)
+        )
+        _convex_hull_upper_chain(
+            points,
+            concat(slice(chain, 0, current_m), [points[i]]),
+            current_m + 1,
+            t,
+            i - 1
+        );

src/experimental/_impl/_convex_intersection_for_impl.scad

@@ -0,0 +1,10 @@
+use <experimental/convex_intersection.scad>;
+
+function _convex_intersection_for(shapes, pre, leng, i = 2) = 
+    i == leng ? pre :
+    let(r = convex_intersection(pre, shapes[i]))
+    r == [] ? [] 
+            : _convex_intersection_for(shapes, 
+                  r, 
+                  leng, i + 1
+              );

src/experimental/_impl/_convex_intersection_impl.scad

@@ -0,0 +1,12 @@
+use <experimental/intersection_p.scad>;
+
+function _intersection_ps(shape, line_pts, epsilon) = 
+    let(
+        leng = len(shape),
+        pts = concat(shape, [shape[0]])
+    )
+    [
+        for(i = [0:leng - 1]) 
+        let(p = intersection_p(line_pts, [pts[i], pts[i + 1]], epsilon = epsilon))
+        if(p != []) p
+    ];

src/experimental/_impl/_m_determinant_impl.scad

@@ -0,0 +1,18 @@
+use <util/slice.scad>;
+use <experimental/sum.scad>;
+
+function _m_determinant_sub(matrix, leng, fc) = 
+    let(
+        init_sub_m = [for(i = [1:leng - 1]) matrix[i]],
+        sub_m = [for(i = [0:len(init_sub_m) - 1]) 
+            concat(slice(init_sub_m[i], 0, fc), slice(init_sub_m[i], fc + 1))
+        ],
+        sgn = pow(-1, fc % 2)
+    )
+    sgn * matrix[0][fc] * _m_determinant(sub_m);
+
+function _m_determinant(matrix) = 
+    let(leng = len(matrix))
+    leng == 2 ? matrix[0][0] * matrix[1][1] - matrix[1][0] * matrix[0][1] :
+        let(indices = [for(i = [0:leng - 1]) i])
+        sum([for(fc = indices) _m_determinant_sub(matrix, leng, fc)]);

src/experimental/_impl/_mz_blocks_impl.scad

@@ -0,0 +1,191 @@
+use <experimental/_impl/_mz_comm.scad>;
+
+// create a starting maze for being visited later.
+function starting_maze(rows, columns) =  [
+    for(y = [1:rows]) 
+        for(x = [1:columns]) 
+            block(
+                x, y, 
+                // all blocks have upper and right walls
+                3, 
+                // unvisited
+                false 
+            )
+];
+
+// find out the index of a block with the position (x, y)
+function indexOf(x, y, maze, i = 0) =
+    i > len(maze) ? -1 : (
+        [get_x(maze[i]), get_y(maze[i])] == [x, y] ? i : 
+            indexOf(x, y, maze, i + 1)
+    );
+
+// is (x, y) visited?
+function visited(x, y, maze) = maze[indexOf(x, y, maze)][3];
+
+// is (x, y) visitable?
+function visitable(x, y, maze, rows, columns) = 
+    y > 0 && y <= rows &&     // y bound
+    x > 0 && x <= columns &&  // x bound
+    !visited(x, y, maze);     // unvisited
+
+// setting (x, y) as being visited
+function set_visited(x, y, maze) = [
+    for(b = maze) 
+        [x, y] == [get_x(b), get_y(b)] ? 
+            [x, y, get_wall_type(b), true] : b
+];
+    
+// 0(right), 1(upper), 2(left), 3(down)
+_rand_dir_table = [
+    [0, 1, 2, 3],
+    [0, 1, 3, 2],
+    [0, 2, 1, 3],
+    [0, 2, 3, 1],
+    [0, 3, 1, 2],
+    [0, 3, 2, 1],
+    [1, 0, 2, 3],
+    [1, 0, 3, 2],
+    [1, 2, 0, 3],
+    [1, 2, 3, 0],
+    [1, 3, 0, 2],
+    [1, 3, 2, 0],
+    [2, 0, 1, 3],
+    [2, 0, 3, 1],
+    [2, 1, 0, 3],
+    [2, 1, 3, 0],
+    [2, 3, 0, 1],
+    [2, 3, 1, 0],
+    [3, 0, 1, 2],
+    [3, 0, 2, 1],
+    [3, 1, 0, 2],
+    [3, 1, 2, 0],
+    [3, 2, 0, 1],
+    [3, 2, 1, 0]
+];
+function rand_dirs() =
+    _rand_dir_table[round(rands(0, 24, 1)[0])]; 
+
+// get x value by dir
+_next_x_table = [1, 0, -1, 0];
+function next_x(x, dir, columns, circular) = 
+    let(nx = x + _next_x_table[dir])
+    circular ? 
+        nx < 1 ? nx + columns : (
+            nx > columns ? nx % columns : nx
+        )
+        :
+        nx;
+    
+// get y value by dir
+_next_y_table = [0, 1, 0, -1];
+function next_y(y, dir, rows, circular) = 
+    let(ny = y + _next_y_table[dir])
+    circular ? 
+        ny < 1 ? ny + rows : (
+            ny > rows ? ny % rows : ny
+        )
+        :
+        ny;
+    
+// go right and carve the right wall
+function go_right_from(x, y, maze) = [
+    for(b = maze) [get_x(b), get_y(b)] == [x, y] ? (
+        upper_right_wall(b) ? 
+            [x, y, 1, visited(x, y, maze)] : 
+            [x, y, 0, visited(x, y, maze)]
+        
+    ) : b
+]; 
+
+// go up and carve the upper wall
+function go_up_from(x, y, maze) = [
+    for(b = maze) [get_x(b), get_y(b)] == [x, y] ? (
+        upper_right_wall(b) ? 
+            [x, y, 2, visited(x, y, maze)] :  
+            [x, y, 0, visited(x, y, maze)]
+        
+    ) : b
+]; 
+
+// go left and carve the right wall of the left block
+function go_left_from(x, y, maze, columns) = 
+    let(
+        x_minus_one = x - 1,
+        nx = x_minus_one < 1 ? x_minus_one + columns : x_minus_one
+    )
+    [
+        for(b = maze) [get_x(b), get_y(b)] == [nx, y] ? (
+            upper_right_wall(b) ? 
+                [nx, y, 1, visited(nx, y, maze)] : 
+                [nx, y, 0, visited(nx, y, maze)]
+        ) : b
+    ]; 
+
+// go down and carve the upper wall of the down block
+function go_down_from(x, y, maze, rows) = [
+    let(
+        y_minus_one = y - 1,
+        ny = y_minus_one < 1 ? y_minus_one + rows : y_minus_one
+    )
+    for(b = maze) [get_x(b), get_y(b)] == [x, ny] ? (
+        upper_right_wall(b) ? 
+            [x, ny, 2, visited(x, ny, maze)] : 
+            [x, ny, 0, visited(x, ny, maze)]
+    ) : b
+]; 
+
+// 0(right), 1(upper), 2(left), 3(down)
+function try_block(dir, x, y, maze, rows, columns) =
+    dir == 0 ? go_right_from(x, y, maze) : 
+    dir == 1 ? go_up_from(x, y, maze) : 
+    dir == 2 ? go_left_from(x, y, maze, columns) : 
+    /*dir 3*/  go_down_from(x, y, maze, rows);
+
+
+// find out visitable dirs from (x, y)
+_visitable_dir_table = [0, 1, 2, 3];
+function visitable_dirs_from(x, y, maze, rows, columns, x_circular, y_circular) = [
+    for(dir = _visitable_dir_table) 
+        if(visitable(next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), maze, rows, columns)) 
+            dir
+];  
+    
+// go maze from (x, y)
+function go_maze(x, y, maze, rows, columns, x_circular = false, y_circular = false) = 
+    //  have visitable dirs?
+    len(visitable_dirs_from(x, y, maze, rows, columns, x_circular, y_circular)) == 0 ? 
+        set_visited(x, y, maze)      // road closed
+        : walk_around_from(          
+            x, y, 
+            rand_dirs(),             
+            set_visited(x, y, maze), 
+            rows, columns,
+            x_circular, y_circular
+        );
+
+// try four directions
+function walk_around_from(x, y, dirs, maze, rows, columns, x_circular, y_circular, i = 4) =
+    // all done?
+    i > 0 ? 
+        // not yet
+        walk_around_from(x, y, dirs, 
+            // try one direction
+            try_routes_from(x, y, dirs[4 - i], maze, rows, columns, x_circular, y_circular),  
+            rows, columns, 
+            x_circular, y_circular,
+            i - 1) 
+        : maze;
+        
+function try_routes_from(x, y, dir, maze, rows, columns, x_circular, y_circular) = 
+    // is the dir visitable?
+    visitable(next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), maze, rows, columns) ?     
+        // try the block 
+        go_maze(
+            next_x(x, dir, columns, x_circular), next_y(y, dir, rows, y_circular), 
+            try_block(dir, x, y, maze, rows, columns),
+            rows, columns,
+            x_circular, y_circular
+        ) 
+        // road closed so return maze directly
+        : maze; 

src/experimental/_impl/_mz_comm.scad

@@ -0,0 +1,14 @@
+// NO_WALL = 0;       
+// UPPER_WALL = 1;    
+// RIGHT_WALL = 2;    
+// UPPER_RIGHT_WALL = 3; 
+
+function no_wall(block) = get_wall_type(block) == 0;
+function upper_wall(block) = get_wall_type(block) == 1;
+function right_wall(block) = get_wall_type(block) == 2;
+function upper_right_wall(block) = get_wall_type(block) == 3;
+
+function block(x, y, wall_type, visited) = [x, y, wall_type, visited];
+function get_x(block) = block[0];
+function get_y(block) = block[1];
+function get_wall_type(block) = block[2];

src/experimental/_impl/_mz_hamiltonian_impl.scad

@@ -0,0 +1,56 @@
+use <util/has.scad>;
+
+function _mz_hamiltonian_upper(x, y) =
+    let(
+        nx = (x - 1) * 2,
+        ny = (y - 1) * 2
+    )
+    [[nx, ny + 2], [nx + 1, ny + 2], [nx + 2, ny + 2]];
+
+function _mz_hamiltonian_right(x, y) =
+    let(
+        nx = (x - 1) * 2,
+        ny = (y - 1) * 2
+    )
+    [[nx + 2, ny + 2], [nx + 2, ny + 1], [nx + 2, ny]];
+    
+function _mz_hamiltonian_upper_right(x, y) =
+    let(
+        nx = (x - 1) * 2,
+        ny = (y - 1) * 2
+    )
+    [[nx, ny + 2], [nx + 1, ny + 2], [nx + 2, ny + 2], [nx + 2, ny + 1], [nx + 2, ny]];
+
+function _mz_hamiltonian_corner_value(dots, x, y) =
+    let(
+        c1 = has(dots, [x, y], sorted = true) ? 1 : 0,
+        c2 = has(dots, [x, y + 1], sorted = true) ? 2 : 0,
+        c3 = has(dots, [x + 1, y + 1], sorted = true) ? 4 : 0,
+        c4 = has(dots, [x + 1, y], sorted = true) ? 8 : 0
+    )
+    c1 + c2 + c3 + c4;
+
+_mz_hamiltonian_dir_table = [
+    [4,  0], [12, 0], [13, 0], // UP
+    [1,  1], [3,  1], [7,  1], // DOWN
+    [2,  2], [6,  2], [14, 2], // LEFT
+    [8,  3], [9,  3], [11, 3]  // RIGHT
+];
+function _mz_hamiltonian_dir(cr_value) = 
+    lookup(cr_value, _mz_hamiltonian_dir_table);
+
+_mz_hamiltonian_nxt_offset = [
+    [0,  1],  // UP
+    [0, -1],  // DOWN
+    [-1, 0],  // LEFT
+    [1,  0]   // RIGHT
+];
+function _mz_hamiltonian_travel(dot_pts, p, leng, i = 0) = 
+    i == leng ? [] :
+    let(
+        dir_i = _mz_hamiltonian_dir(_mz_hamiltonian_corner_value(dot_pts, p[0], p[1])),
+        nxt_p = p + _mz_hamiltonian_nxt_offset[dir_i]
+    )
+    concat(
+        [p], _mz_hamiltonian_travel(dot_pts, nxt_p, leng, i + 1)
+    );

src/experimental/_impl/_mz_walls_impl.scad

@@ -0,0 +1,9 @@
+use <experimental/_impl/_mz_comm.scad>;
+
+function block_walls(block, block_width) = 
+    let(
+        loc = [get_x(block) - 1, get_y(block) - 1] * block_width,
+        upper = upper_wall(block) || upper_right_wall(block) ? [[0, block_width] + loc, [block_width, block_width] + loc] : [],
+        right = right_wall(block) || upper_right_wall(block) ? [[block_width, block_width] + loc, [block_width, 0] + loc] : []
+    )
+    concat(upper, right); 

src/experimental/_impl/_pnoise1_impl.scad

@@ -0,0 +1,17 @@
+use <experimental/_impl/_pnoise_comm.scad>;
+
+function _pnoise1_grad1(hashvalue, x) = (hashvalue % 2 == 0) ? x : -x; 
+
+function _pnoise1_impl(x, seed) =
+    let(
+        xi = floor(x),
+        xf = x - xi,
+        u = _pnoise_fade(xf),
+        a = _pnoise_lookup_poise_table(seed + xi),
+        b = _pnoise_lookup_poise_table(seed + xi + 1)
+    )
+    _pnoise_lerp(
+        _pnoise1_grad1(a, xf),
+        _pnoise1_grad1(b, xf - 1),
+        u
+    );

src/experimental/_impl/_pnoise2_impl.scad

@@ -0,0 +1,36 @@
+use <experimental/_impl/_pnoise_comm.scad>;
+
+function _pnoise2_grad2(hashvalue, x, y) = 
+    let(case = hashvalue % 8)
+    case == 0 ? y :
+    case == 1 ? x + y :
+    case == 2 ? x:
+    case == 3 ? x - y:
+    case == 4 ? -y:
+    case == 5 ? -x - y:
+    case == 6 ? -x : -x + y;
+
+function _pnoise2(x, y, seed) =
+    let(
+        xi = floor(x),
+        yi = floor(y),
+        xf = x - xi,
+        yf = y - yi,
+        u = _pnoise_fade(xf),
+        v = _pnoise_fade(yf),
+        aa = _pnoise_lookup_poise_table(_pnoise_lookup_poise_table(seed + xi) + yi),
+        ba = _pnoise_lookup_poise_table(_pnoise_lookup_poise_table(seed + xi + 1) + yi),
+        ab = _pnoise_lookup_poise_table(_pnoise_lookup_poise_table(seed + xi) + yi + 1),
+        bb = _pnoise_lookup_poise_table(_pnoise_lookup_poise_table(seed + xi + 1) + yi + 1),
+        y1 = _pnoise_lerp(
+            _pnoise2_grad2(aa, xf, yf),
+            _pnoise2_grad2(ba, xf - 1, yf),
+            u
+        ),
+        y2 = _pnoise_lerp(
+            _pnoise2_grad2(ab, xf, yf - 1),
+            _pnoise2_grad2(bb, xf - 1, yf - 1),
+            u
+        )             
+    )
+    _pnoise_lerp(y1, y2, v);

src/experimental/_impl/_pnoise3_impl.scad

@@ -0,0 +1,96 @@
+use <experimental/_impl/_pnoise_comm.scad>;
+
+function _pnoise3_grad3(hashvalue, x, y, z) = 
+    let(case = hashvalue % 16)
+    case ==  0 ? x + y :
+    case ==  1 ? -x + y :
+    case ==  2 ? x - y:
+    case ==  3 ? -x - y:
+    case ==  4 ? x + z:
+    case ==  5 ? -x + z:
+    case ==  6 ? x - z : 
+    case ==  7 ? -x - z : 
+    case ==  8 ? y + z : 
+    case ==  9 ? -y + z : 
+    case == 10 ? y - z : 
+    case == 11 ? -y - z : 
+    case == 12 ? y + x : 
+    case == 13 ? -y + z : 
+    case == 14 ? y - x : -y - z;
+
+function _pnoise3(x, y, z, seed) =
+    let(
+        xi = floor(x),
+        yi = floor(y),
+        zi = floor(z),        
+        xf = x - xi,
+        yf = y - yi,
+        zf = z - zi,
+        u = _pnoise_fade(xf),
+        v = _pnoise_fade(yf),
+        w = _pnoise_fade(zf),
+
+        aaa = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi) + yi
+                ) + zi            
+        ),
+        aba = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi) + yi + 1
+                ) + zi            
+        ),        
+        aab = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi) + yi
+                ) + zi + 1     
+        ),
+        abb = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi) + yi + 1
+                ) + zi + 1
+        ),
+        baa = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi + 1) + yi
+                ) + zi            
+        ),
+        bba = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi + 1) + yi + 1
+                ) + zi            
+        ),    
+        bab = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi + 1) + yi
+                ) + zi + 1
+        ),
+        bbb = _pnoise_lookup_poise_table(
+            _pnoise_lookup_poise_table(
+                    _pnoise_lookup_poise_table(seed + xi + 1) + yi + 1
+                ) + zi + 1
+        ),        
+        x1 = _pnoise_lerp(
+            _pnoise3_grad3(aaa, xf, yf, zf),
+            _pnoise3_grad3(baa, xf - 1, yf, zf),
+            u
+        ),
+        x2 = _pnoise_lerp(
+            _pnoise3_grad3(aba, xf, yf - 1, zf),
+            _pnoise3_grad3(bba, xf - 1, yf - 1, zf),
+            u
+        ),
+        y1 = _pnoise_lerp(x1, x2, v),
+        x3 = _pnoise_lerp(
+            _pnoise3_grad3(aab, xf, yf, zf - 1),
+            _pnoise3_grad3(bab, xf - 1, yf, zf - 1),
+            u
+        ),
+        x4 = _pnoise_lerp(
+            _pnoise3_grad3(abb, xf, yf - 1, zf - 1),
+            _pnoise3_grad3(bbb, xf - 1, yf - 1, zf - 1),
+            u
+        ),
+        y2 = _pnoise_lerp(x3, x4, v)      
+    )
+    _pnoise_lerp(y1, y2, w);

src/experimental/_impl/_pnoise_comm.scad

@@ -0,0 +1,8 @@
+_pnoise_table = [151,160,137,91,90,15,131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,190,6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,88,237,149,56,87,174,20,125,136,171,168,68,175,74,165,71,134,139,48,27,166,77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,102,143,54,65,25,63,161,1,216,80,73,209,76,132,187,208,89,18,169,200,196,135,130,116,188,159,86,164,100,109,198,173,186,3,64,52,217,226,250,124,123,5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,223,183,170,213,119,248,152,2,44,154,163,70,221,153,101,155,167,43,172,9,129,22,39,253,19,98,108,110,79,113,224,232,178,185,112,104,218,246,97,228,251,34,242,193,238,210,144,12,191,179,162,241,81,51,145,235,249,14,239,107,49,192,214,31,181,199,106,157,184,84,204,176,115,121,50,45,127,4,150,254,138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180];
+
+// Simplex
+function _pnoise_fade(t) = pow(t, 3) * (t * (t * 6 - 15) + 10);
+
+function _pnoise_lerp(a, b, t) = a + t * (b - a);
+
+function _pnoise_lookup_poise_table(i) = _pnoise_table[i % 256];

src/experimental/_impl/_pnoise_contour_impl.scad

@@ -0,0 +1,29 @@
+use <experimental/pnoise2.scad>;
+
+INFINITY = 1e200 * 1e200;
+
+function _pnoise_contour_step_sub(x, y, current_noise, seed, step_leng, step_angle, heading, min_delta, maybe_heading, close_noise, maybe_x, maybe_y, theta) =
+    theta >= heading + 90 ? [maybe_x, maybe_y, maybe_heading] :
+    let(
+        nx = x + step_leng * cos(theta),
+        ny = y + step_leng * sin(theta),
+        new_noise = pnoise2(nx, ny, seed),
+        delta = abs(new_noise - current_noise)        
+    )
+    delta < min_delta ? 
+        _pnoise_contour_step_sub(x, y, current_noise, seed, step_leng, step_angle, heading, delta, theta, new_noise, nx, ny, theta + step_angle) :
+        _pnoise_contour_step_sub(x, y, current_noise, seed, step_leng, step_angle, heading, min_delta, maybe_heading, close_noise, maybe_x, maybe_y, theta + step_angle);
+
+function _pnoise_contour_step(x, y, heading, noise, seed, step_leng, step_angle) = 
+    _pnoise_contour_step_sub(
+        x, y, 
+        is_undef(noise) ? pnoise2(x, y, seed) : noise,
+        seed, step_leng, step_angle, heading, INFINITY, heading, -1, -1, -1, heading - 90
+    );
+
+function _pnoise_contour(x, y, heading, noise, seed, steps, step_leng, step_angle, i = 0) =
+    i == steps ? [[x, y]] :
+    let(
+        xyh = _pnoise_contour_step(x, y, heading, noise, seed, step_leng, step_angle)
+    )
+    concat([[x, y]], _pnoise_contour(xyh[0], xyh[1], xyh[2], noise, seed, steps, step_leng, step_angle, i + 1));

src/experimental/_impl/_px_surround_impl.scad

@@ -0,0 +1,35 @@
+use <util/has.scad>;
+
+function _px_surround_corner_value(pts, x, y) =
+    let(
+        c1 = has(pts, [x, y - 1], sorted = true) || has(pts, [x - 1, y - 1], sorted = true) ? 1 : 0,
+        c2 = has(pts, [x - 1, y], sorted = true) || has(pts, [x - 1, y + 1], sorted = true) ? 2 : 0,
+        c3 = has(pts, [x, y + 1], sorted = true) || has(pts, [x + 1, y + 1], sorted = true) ? 4 : 0,
+        c4 = has(pts, [x + 1, y], sorted = true) || has(pts, [x + 1, y - 1], sorted = true) ? 8 : 0
+    )
+    c1 + c2 + c3 + c4;
+
+_px_surround_dir_table = [
+    [4,  0], [6,  0], [7, 0],    // RIGHT
+    [8,  1], [12, 1], [14, 1],   // DOWN
+    [2,  2], [3,  2], [11, 2],   // UP
+    [1,  3], [9,  3], [13, 3]    // LEFT
+];
+function _px_surround_dir(cr_value) = 
+    lookup(cr_value, _px_surround_dir_table);
+
+_px_surround_nxt_offset = [
+    [1,  0],   // RIGHT
+    [0, -1],   // DOWN
+    [0,  1],   // UP
+    [-1, 0]    // LEFT
+];
+function _px_surround_travel(pts, p, fst) = 
+    let(
+        dir_i = _px_surround_dir(_px_surround_corner_value(pts, p[0], p[1])),
+        nxt_p = p + _px_surround_nxt_offset[dir_i]
+    )
+    nxt_p == fst ? [p] :
+    concat(
+        [p], _px_surround_travel(pts, nxt_p, fst)
+    );

src/experimental/_impl/_sf_square_surfaces.scad

@@ -0,0 +1,22 @@
+function _sf_square_surfaces(levels, thickness, depth, invert) =
+    let(
+        rows = len(levels),
+        columns = len(levels[0]),
+        offset_z = invert ? 0 : thickness - depth,
+        surface1 = [
+            for(r = [0:rows - 1]) 
+            [
+                for(c = [0:columns - 1]) 
+                let(lv = invert ? 255 - levels[rows - r - 1][c] : levels[rows - r - 1][c])
+                [c, r, lv / 255 * depth + offset_z]
+            ]
+        ],
+        surface2 = [
+            for(r = [0:rows - 1]) 
+            [
+                for(c = [0:columns - 1]) 
+                [c, r, 0]
+            ]
+        ]        
+    )
+    [surface1, surface2];

src/experimental/_impl/_sum_impl.scad

@@ -0,0 +1,2 @@
+function _sum_impl(lt, leng, i = 0) =
+    i >= leng - 1 ? lt[i] : (lt[i] + _sum_impl(lt, leng, i + 1));

src/experimental/_impl/_tri_delaunay_impl.scad

@@ -0,0 +1,48 @@
+use <experimental/tri_circumcircle.scad>;
+
+// [max, min, min, max]      
+function _tri_delaunay_boundIndices(points, leng, indices, i = 0) =
+    let(
+        bounds = i < leng - 1 ? _tri_delaunay_boundIndices(points, leng, indices, i + 1)
+                              : [undef, undef, undef, undef],
+        p0 = points[indices[0]],
+        p1 = points[indices[1]],
+        p2 = points[i],
+        c_circle = tri_circumcircle([p0, p1, p2]),
+        r = c_circle[1],
+        cside = c_circle == [] ? undef : cross(p1 - p0, c_circle[0] - p1),
+        pside = cross(p1 - p0, p2 - p1),
+        pdot = (p2 - p0) * (p2 - p1)
+    )
+    pdot < 0 && 0 == pside  ? [-1, 1, 1, -1] :
+    c_circle == [] ? bounds :
+    pside > 0 && cside > 0  ? [bounds[0], bounds[1], bounds[2], bounds[3] ? min(bounds[3], r) : r]  :
+    pside > 0 && cside <= 0 ? [bounds[0], bounds[1], bounds[2] ? max(bounds[2], r) : r, bounds[3]] :
+    pside <= 0 && cside > 0 ? [bounds[0], bounds[1] ? max(bounds[1],r) : r, bounds[2], bounds[3]] :
+                              [bounds[0] ? min(bounds[0], r) : r, bounds[1], bounds[2], bounds[3]]; // is_undef(cside) also returns this
+
+function _tri_delaunay_try_triangle(points, indices_boundIndices, i) = 
+   let(
+      indices = indices_boundIndices[0],
+      bounds = indices_boundIndices[1],
+      p0 = points[indices[0]],
+      p1 = points[indices[1]],
+      p2 = points[i],
+      c_circle = tri_circumcircle([p0, p1, p2]),
+      r = c_circle[1],
+      cside = c_circle == [] ? undef : cross(p1 - p0, c_circle[0] - p1)
+   )
+   c_circle == [] ? undef : 
+   (cside > 1  && (!bounds[2] && (!bounds[1] || r>=bounds[1]) && (!bounds[3] || r<=bounds[3]))) ||
+   (cside <= 1 && (!bounds[1] && (!bounds[2] || r>=bounds[2]) && (!bounds[0] || r<=bounds[0]))) ? concat(indices, [i]) :
+   undef;
+   
+function _tri_delaunay_triangleIndices(points, leng, indices_boundIndices, triangles, i = 0) =
+   let(
+      indices = indices_boundIndices[0],
+      newtriangle = _tri_delaunay_try_triangle(points, indices_boundIndices, i),
+      newtriangles = newtriangle ? concat(triangles, [newtriangle]) : triangles
+   )
+   i <= indices[1] ? _tri_delaunay_triangleIndices(points, leng, indices_boundIndices, [], indices[1] + 1) : 
+   i< leng - 1 ? _tri_delaunay_triangleIndices(points, leng, indices_boundIndices, newtriangles,i + 1) :
+   newtriangles;

src/experimental/_impl/_tri_ear_clipping_impl.scad

@@ -0,0 +1,92 @@
+function _triangulate_in_triangle(p0, p1, p2, p) =
+    let(
+        v0 = p0 - p,
+        v1 = p1 - p,
+        v2 = p2 - p,
+        c0 = cross(v0, v1),
+        c1 = cross(v1, v2),
+        c2 = cross(v2, v0)
+    )
+    (c0 > 0 && c1 > 0 && c2 > 0) || (c0 < 0 && c1 < 0 && c2 < 0);
+
+function _triangulate_snipable(shape_pts, u, v, w, n, indices, epsilon = 0.0001) =
+    let(
+        a = shape_pts[indices[u]],
+        b = shape_pts[indices[v]],
+        c = shape_pts[indices[w]],
+        ax = a[0],
+        ay = a[1],
+        bx = b[0],
+        by = b[1],
+        cx = c[0],
+        cy = c[1],
+        determinant = cross([bx - ax, by - ay],  [cx - ax, cy - ay])
+    )
+    epsilon > determinant ? 
+        false : _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices);
+    
+function _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices, p = 0) = 
+    p == n ? true : (
+        ((p == u) || (p == v) || (p == w)) ? _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices, p + 1) : (
+            _triangulate_in_triangle(a, b, c, shape_pts[indices[p]]) ? 
+                false : _triangulate_snipable_sub(shape_pts, n, u, v, w, a, b, c, indices, p + 1)
+        )
+    );
+
+// remove the elem at idx v from indices  
+function _triangulate_remove_v(indices, v, num_of_vertices) = 
+    let(
+        nv_minuns_one = num_of_vertices - 1
+    )
+    v == 0 ? [for(i = 1; i <= nv_minuns_one; i = i + 1) indices[i]] : (
+        v == nv_minuns_one ? [for(i = 0; i < v; i = i + 1) indices[i]] : concat(
+            [for(i = 0; i < v; i = i + 1) indices[i]], 
+            [for(i = v + 1; i <= nv_minuns_one; i = i + 1) indices[i]]
+        )
+    );
+    
+function _triangulate_zero_or_value(num_of_vertices, value) = 
+    num_of_vertices <= value ? 0 : value;
+
+function _triangulate_real_triangulate_sub(shape_pts, collector, indices, v, num_of_vertices, count, epsilon) = 
+    let(
+        // idxes of three consecutive vertices
+        u = _triangulate_zero_or_value(num_of_vertices, v),     
+        vi = _triangulate_zero_or_value(num_of_vertices, u + 1), 
+        w = _triangulate_zero_or_value(num_of_vertices, vi + 1) 
+    )
+    _triangulate_snipable(shape_pts, u, vi, w, num_of_vertices, indices, epsilon) ? 
+        _triangulate_snip(shape_pts, collector, indices, u, vi, w, num_of_vertices, count, epsilon) : 
+        _triangulate_real_triangulate(shape_pts, collector, indices, vi, num_of_vertices, count, epsilon);
+        
+function _triangulate_snip(shape_pts, collector, indices, u, v, w, num_of_vertices, count, epsilon) = 
+    let(
+        a = indices[u],
+        b = indices[v],
+        c = indices[w],
+        new_nv = num_of_vertices - 1
+    )
+    _triangulate_real_triangulate( 
+        shape_pts, 
+        concat(collector, [[a, b, c]]),  
+        _triangulate_remove_v(indices, v, num_of_vertices),
+        v, 
+        new_nv,
+        2 * new_nv,
+        epsilon
+    );
+
+function _triangulate_real_triangulate(shape_pts, collector, indices, v, num_of_vertices, count, epsilon) = 
+    count <= 0 ? [] : (
+        num_of_vertices == 2 ? 
+            collector : _triangulate_real_triangulate_sub(shape_pts, collector, indices, v, num_of_vertices, count - 1,  epsilon)
+    );
+    
+function _tri_ear_clipping_impl(shape_pts,  epsilon) =
+    let(
+        num_of_vertices = len(shape_pts),
+        v = num_of_vertices - 1,
+        indices = [for(vi = 0; vi <= v; vi = vi + 1) vi],
+        count = 2 * num_of_vertices        
+    )
+    num_of_vertices < 3 ? [] : _triangulate_real_triangulate(shape_pts, [], indices, v, num_of_vertices, count, epsilon);

src/experimental/_impl/_voronoi2d_cells_impl.scad

@@ -0,0 +1,25 @@
+
+use <rotate_p.scad>;
+
+function _default_region_size(points) = 
+    let(
+        xs = [for(p = points) p[0]],
+        ys = [for(p = points) abs(p[1])]
+    )
+    max([(max(xs) -  min(xs) / 2), (max(ys) -  min(ys)) / 2]);
+
+function _cells_lt_before_intersection(shape, size, points, pt) =
+    let(half_region_size = 0.5 * size)
+    [
+        for(p = points)
+            if(pt != p)
+            let(
+                v = p - pt,
+                offset = (pt + p) / 2 - v / norm(v) * half_region_size,
+                a = atan2(v[1], v[0])            
+            )
+            [
+                for(sp = shape)
+                     rotate_p(sp, a) + offset
+            ]
+    ];

src/experimental/_impl/_voronoi2d_lines_impl.scad

@@ -0,0 +1,37 @@
+function _voronoi2d_lines_tri_vertex(tri, p) = 
+    tri[0] == p || tri[1] == p || tri[2] == p;
+
+function _voronoi2d_lines_tri_same(tri1, tri2) = 
+    _voronoi2d_lines_tri_vertex(tri1, tri2[0]) && _voronoi2d_lines_tri_vertex(tri1, tri2[1]) && _voronoi2d_lines_tri_vertex(tri1, tri2[2]);
+
+function _voronoi2d_lines_tri_coedge(tri1, tri2) =
+    let(
+        n1 = _voronoi2d_lines_tri_vertex(tri2, tri1[0]) ? 1 : 0,
+        n2 = _voronoi2d_lines_tri_vertex(tri2, tri1[1]) ? 1 : 0,
+        n = n1 + n2
+    )
+    (n > 1) || ((n + (_voronoi2d_lines_tri_vertex(tri2, tri1[2]) ? 1 : 0)) > 1);
+    
+function _voronoi2d_lines_tri_neighbors_impl(tris, me, leng, nbrs = [], i = 0) = 
+    len(nbrs) == 3 || i == leng ? nbrs :
+    !_voronoi2d_lines_tri_same(me, tris[i]) && _voronoi2d_lines_tri_coedge(me, tris[i]) ? _voronoi2d_lines_tri_neighbors_impl(tris, me, leng, concat(nbrs, [tris[i]]), i + 1) :
+    _voronoi2d_lines_tri_neighbors_impl(tris, me, leng, nbrs, i + 1);
+        
+function _voronoi2d_lines_tri_neighbors(tris, me) = 
+    _voronoi2d_lines_tri_neighbors_impl(tris, me, len(tris));       
+
+function _voronoi2d_lines_line_has(line, p) =
+    p == line[0] || p == line[1];
+
+function _voronoi2d_lines_same_line(line1, line2) =
+    _voronoi2d_lines_line_has(line1, line2[0]) && _voronoi2d_lines_line_has(line1, line2[1]);
+
+function _voronoi2d_lines_lines_has(lines, line, leng, i = 0) = 
+    i == leng ? false :
+    _voronoi2d_lines_same_line(lines[i], line) ? true : _voronoi2d_lines_lines_has(lines, line, leng, i + 1);
+
+function _voronoi2d_lines_dedup_lines_impl(src, dest, leng, i = 0) = 
+    i == leng ? dest :
+    _voronoi2d_lines_lines_has(dest, src[i], len(dest)) ? _voronoi2d_lines_dedup_lines_impl(src, dest, leng, i + 1) : _voronoi2d_lines_dedup_lines_impl(src, concat(dest, [src[i]]), leng, i + 1);
+
+function _voronoi2d_lines_dedup_lines(lines) = _voronoi2d_lines_dedup_lines_impl(lines, [], len(lines));

src/experimental/convex_center_p.scad

@@ -0,0 +1,3 @@
+use <experimental/sum.scad>;
+
+function convex_center_p(points) = sum(points) / len(points);

src/experimental/convex_ct_clk_order.scad

@@ -0,0 +1,10 @@
+use <util/sort.scad>;
+use <experimental/convex_center_p.scad>;
+
+function convex_ct_clk_order(points) =
+    let(
+        cpt = convex_center_p(points),
+        pts_as = [for(p = points) [p, atan2(p[1] - cpt[1], p[0] - cpt[0])]],
+        sorted = sort(pts_as, by = "idx", idx = 1)
+    )
+    [for(v = sorted) v[0]];

src/experimental/convex_hull.scad

@@ -0,0 +1,11 @@
+use <experimental/_impl/_convex_hull_impl.scad>;
+
+function convex_hull(points) = 
+    let(
+        sorted = _convex_hull_sort_by_xy(points),
+        leng = len(sorted),
+        lwr_ch = _convex_hull_lower_chain(sorted, leng, [], 0, 0),
+        leng_lwr_ch = len(lwr_ch),
+        chain = _convex_hull_upper_chain(sorted, lwr_ch, leng_lwr_ch, leng_lwr_ch + 1, leng - 2)
+    )
+    [for(i = [0:len(chain) - 2]) chain[i]];

src/experimental/convex_intersection.scad

@@ -0,0 +1,18 @@
+
+use <in_shape.scad>;
+use <experimental/_impl/_convex_intersection_impl.scad>;
+use <experimental/convex_ct_clk_order.scad>;
+
+function convex_intersection(shape1, shape2, epsilon = 0.0001) =
+    (shape1 == [] || shape2 == []) ? [] :
+    let(
+        leng = len(shape1),
+        pts = concat(shape1, [shape1[0]])
+    )
+    convex_ct_clk_order(
+        concat(
+            [for(p = shape1) if(in_shape(shape2, p, include_edge = true)) p], 
+            [for(p = shape2) if(in_shape(shape1, p, include_edge = true)) p],
+            [for(i = [0:leng - 1]) each _intersection_ps(shape2, [pts[i], pts[i + 1]], epsilon)] 
+        )
+    );  

src/experimental/convex_intersection_for.scad

@@ -0,0 +1,10 @@
+use <experimental/convex_intersection.scad>;
+use <experimental/_impl/_convex_intersection_for_impl.scad>;
+                
+function convex_intersection_for(shapes) = 
+    let(leng = len(shapes))
+    _convex_intersection_for(
+        shapes, 
+        convex_intersection(shapes[0], shapes[1]), 
+        leng
+    );

src/experimental/demo/convex_hull_demo.scad

@@ -0,0 +1,15 @@
+use <hull_polyline2d.scad>;
+use <experimental/tri_bisectors.scad>;
+use <experimental/convex_hull.scad>;
+use <shape_starburst.scad>;
+
+xs = rands(-20, 20, 150);
+ys = rands(-20, 20, 150);
+points = [for(i = [0:len(xs) - 1]) [xs[i], ys[i]]];
+
+for(p = points) {
+    translate(p)
+        sphere(.5);
+}
+hull_shape = convex_hull(points);
+#hull_polyline2d(concat(hull_shape, [hull_shape[0]]), width = 1);

src/experimental/demo/convex_intersection_demo.scad

@@ -0,0 +1,18 @@
+use <hull_polyline2d.scad>;
+use <rotate_p.scad>;
+use <shape_square.scad>;
+use <experimental/convex_intersection.scad>;
+
+sq1 = shape_square(size = 10, corner_r = 3, $fn = 12);
+sq2 = [for(p = sq1) rotate_p(p + [5, 0], 45)];
+sq3 = [for(p = sq1) rotate_p(p + [5, 0], -45)];
+
+intersection1 = convex_intersection(sq1, sq2);
+intersection2 = convex_intersection(intersection1, sq3);
+
+polygon(intersection1);    
+#polygon(intersection2);    
+
+%polygon(sq1);
+%polygon(sq2);
+%polygon(sq3);

src/experimental/demo/loft_demo.scad

@@ -0,0 +1,31 @@
+use <shape_starburst.scad>;
+use <circle_path.scad>;
+use <rotate_p.scad>;
+use <experimental/loft.scad>;
+    
+sects = [
+    for(i = 10; i >= 4; i = i - 1)
+    [
+        for(p = shape_starburst(15, 12, i % 2 == 1 ? i : i - 1)) rotate_p([p[0], p[1], 5 * (i - 4)], i * 10)
+    ]
+];
+loft(sects, slices = 3);
+
+translate([30, 0, 0])
+difference() {
+    loft(
+        [
+            [for(p = circle_path(10, $fn = 3)) [p[0], p[1], 15]],
+            [for(p = circle_path(15, $fn = 24)) [p[0], p[1], 0]]        
+        ],
+        slices = 4
+    );
+
+    loft(
+        [
+            [for(p = circle_path(8, $fn = 3)) [p[0], p[1], 15.1]],
+            [for(p = circle_path(13, $fn = 24)) [p[0], p[1], -0.1]]        
+        ],
+        slices = 4
+    );    
+}

src/experimental/demo/photo_bend.scad

@@ -0,0 +1,111 @@
+use <experimental/sf_bend.scad>;
+
+radius = 50;
+thickness = 10;
+depth = 8;
+angle = 180;
+invert = false;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 153, 162, 152, 97, 82, 120, 155, 66, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 146, 146, 131, 118, 96, 75, 46, 46, 191, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 139, 130, 117, 99, 78, 53, 38, 64, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 108, 102, 95, 74, 60, 38, 47, 89, 85, 153, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 101, 77, 67, 52, 38, 48, 82, 109, 73, 48, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 70, 40, 42, 57, 84, 107, 92, 62, 38, 164, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 215, 100, 89, 102, 115, 91, 72, 44, 47, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 112, 114, 102, 86, 68, 51, 41, 66, 101, 94, 140, 194, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 156, 93, 80, 65, 51, 36, 59, 97, 100, 69, 49, 110, 93, 223, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 222, 70, 54, 47, 45, 69, 96, 110, 91, 58, 40, 92, 76, 70, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 225, 222, 141, 104, 111, 140, 144, 109, 77, 41, 49, 87, 64, 42, 197, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 221, 227, 223, 224, 228, 227, 220, 166, 129, 116, 46, 74, 89, 42, 40, 155, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 224, 224, 224, 227, 223, 169, 130, 129, 129, 88, 100, 58, 37, 62, 176, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 226, 226, 226, 226, 216, 134, 130, 127, 130, 118, 76, 42, 54, 92, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 226, 223, 228, 225, 228, 221, 182, 131, 131, 129, 128, 112, 41, 56, 95, 182, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 202, 212, 209, 212, 220, 225, 225, 153, 129, 125, 127, 130, 120, 86, 118, 208, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 176, 176, 193, 191, 198, 201, 209, 134, 129, 128, 128, 127, 128, 185, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 154, 149, 152, 166, 168, 174, 181, 130, 128, 131, 131, 123, 128, 125, 189, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 142, 116, 123, 128, 138, 140, 145, 136, 128, 124, 131, 128, 130, 131, 133, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 206, 184, 224, 178, 158, 145, 108, 124, 131, 125, 130, 131, 129, 127, 130, 130, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 221, 226, 224, 222, 102, 100, 128, 131, 125, 127, 128, 128, 127, 129, 144, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 224, 227, 224, 194, 125, 117, 122, 128, 128, 124, 130, 128, 126, 129, 132, 145, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 225, 228, 224, 169, 128, 129, 95, 92, 127, 132, 124, 130, 130, 123, 127, 129, 172, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 229, 227, 226, 227, 222, 136, 128, 122, 88, 83, 106, 128, 127, 133, 123, 132, 130, 128, 129, 185, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 229, 223, 219, 219, 216, 205, 199, 196, 188, 179, 192, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 225, 226, 225, 207, 131, 129, 124, 80, 80, 82, 103, 131, 126, 126, 131, 128, 129, 128, 130, 200, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 225, 224, 224, 224, 224, 223, 219, 215, 205, 201, 194, 183, 176, 158, 162, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 224, 224, 228, 174, 128, 126, 207, 178, 89, 84, 84, 115, 129, 126, 125, 127, 127, 127, 127, 134, 226, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 222, 227, 225, 222, 227, 227, 225, 223, 224, 223, 220, 215, 208, 196, 192, 179, 171, 168, 146, 138, 195, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 204, 188, 165, 145, 120, 82, 69, 182, 255, 255, 255, 64, 2, 4, 1, 0, 6, 1, 0, 3, 0, 10, 133, 139, 134, 30, 3, 2, 72, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 2, 1, 1, 0, 0, 0, 0, 1, 1, 0, 6, 7, 113, 140, 120, 120, 91, 88, 66, 73, 126, 97, 108, 42, 2, 5, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 210, 196, 179, 161, 138, 118, 83, 60, 141, 255, 255, 255, 255, 100, 29, 3, 1, 1, 1, 0, 6, 2, 4, 56, 121, 33, 5, 6, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 6, 4, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 48, 103, 73, 69, 112, 68, 64, 78, 108, 150, 162, 73, 6, 15, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 211, 199, 186, 169, 154, 135, 106, 159, 213, 169, 203, 255, 255, 255, 255, 255, 219, 152, 93, 41, 9, 0, 0, 0, 8, 2, 3, 20, 159, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 168, 0, 2, 1, 0, 0, 1, 1, 1, 1, 1, 0, 5, 97, 157, 141, 104, 89, 71, 95, 106, 135, 94, 22, 7, 14, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 218, 207, 199, 187, 176, 162, 147, 126, 114, 255, 255, 170, 113, 135, 255, 255, 255, 255, 255, 255, 255, 255, 255, 179, 100, 48, 11, 4, 57, 209, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 6, 164, 204, 176, 133, 65, 3, 3, 2, 0, 7, 3, 15, 199, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 226, 228, 227, 224, 222, 216, 209, 204, 196, 185, 174, 163, 153, 134, 115, 151, 255, 209, 157, 103, 67, 216, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 94, 0, 1, 2, 0, 3, 1, 0, 2, 0, 1, 1, 25, 220, 255, 203, 147, 63, 7, 0, 1, 2, 8, 35, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 215, 211, 211, 203, 209, 202, 196, 188, 178, 172, 165, 150, 138, 125, 105, 151, 255, 184, 133, 86, 66, 156, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 91, 5, 0, 0, 5, 2, 2, 5, 0, 0, 5, 0, 42, 255, 255, 200, 134, 46, 0, 2, 3, 2, 49, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 194, 182, 172, 197, 193, 185, 185, 174, 169, 161, 149, 145, 126, 114, 94, 131, 200, 162, 118, 79, 68, 129, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 93, 0, 0, 0, 3, 0, 0, 0, 2, 6, 0, 4, 52, 206, 210, 176, 98, 19, 5, 3, 0, 53, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 198, 111, 36, 182, 173, 177, 163, 164, 157, 143, 135, 129, 112, 101, 83, 82, 177, 135, 97, 62, 84, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 162, 0, 1, 3, 0, 1, 5, 0, 0, 4, 2, 2, 60, 141, 158, 129, 86, 2, 0, 6, 74, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 229, 143, 2, 165, 165, 159, 152, 63, 61, 135, 123, 115, 104, 89, 70, 59, 128, 113, 79, 66, 103, 160, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 196, 8, 0, 0, 1, 2, 0, 4, 5, 0, 1, 0, 48, 124, 81, 88, 45, 5, 3, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 164, 7, 111, 147, 146, 140, 41, 28, 123, 112, 99, 87, 75, 60, 63, 87, 89, 65, 80, 131, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 73, 2, 2, 0, 3, 0, 0, 2, 0, 3, 0, 38, 149, 142, 74, 0, 0, 103, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 44, 60, 132, 126, 129, 43, 11, 103, 96, 90, 73, 61, 62, 71, 100, 90, 93, 128, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 107, 46, 11, 0, 2, 4, 0, 0, 1, 2, 8, 100, 50, 5, 14, 136, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_bend(levels, radius, thickness, depth, angle, invert);

src/experimental/demo/photo_ring.scad

@@ -0,0 +1,112 @@
+use <experimental/sf_ring.scad>;
+
+radius = 50;
+thickness = 10;
+depth = 5;
+angle = 90;
+twist = 90;
+invert = true;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_ring(levels, radius, thickness, depth, angle, twist, invert);

src/experimental/demo/photo_sphere.scad

@@ -0,0 +1,111 @@
+use <experimental/sf_sphere.scad>;
+
+radius = 50;
+thickness = 10;
+depth = 5;
+angle = [180, 180];
+invert = false;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 153, 162, 152, 97, 82, 120, 155, 66, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 146, 146, 131, 118, 96, 75, 46, 46, 191, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 139, 130, 117, 99, 78, 53, 38, 64, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 108, 102, 95, 74, 60, 38, 47, 89, 85, 153, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 101, 77, 67, 52, 38, 48, 82, 109, 73, 48, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 70, 40, 42, 57, 84, 107, 92, 62, 38, 164, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 215, 100, 89, 102, 115, 91, 72, 44, 47, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 112, 114, 102, 86, 68, 51, 41, 66, 101, 94, 140, 194, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 156, 93, 80, 65, 51, 36, 59, 97, 100, 69, 49, 110, 93, 223, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 222, 70, 54, 47, 45, 69, 96, 110, 91, 58, 40, 92, 76, 70, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 225, 222, 141, 104, 111, 140, 144, 109, 77, 41, 49, 87, 64, 42, 197, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_sphere(levels, radius, thickness, depth, angle, invert);

src/experimental/demo/photo_square.scad

@@ -0,0 +1,109 @@
+use <experimental/sf_square.scad>;
+
+thicnkess = 10;
+depth = 5;
+invert = false;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 85, 62, 173, 255, 255, 222, 154, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 147, 16, 73, 166, 190, 8, 17, 99, 97, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 151, 11, 26, 153, 111, 61, 58, 40, 128, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 137, 73, 74, 154, 131, 24, 18, 95, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 217, 153, 162, 152, 97, 82, 120, 155, 66, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 146, 146, 131, 118, 96, 75, 46, 46, 191, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 185, 139, 130, 117, 99, 78, 53, 38, 64, 168, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 194, 108, 102, 95, 74, 60, 38, 47, 89, 85, 153, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 101, 77, 67, 52, 38, 48, 82, 109, 73, 48, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 70, 40, 42, 57, 84, 107, 92, 62, 38, 164, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 215, 100, 89, 102, 115, 91, 72, 44, 47, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 112, 114, 102, 86, 68, 51, 41, 66, 101, 94, 140, 194, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 156, 93, 80, 65, 51, 36, 59, 97, 100, 69, 49, 110, 93, 223, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 222, 70, 54, 47, 45, 69, 96, 110, 91, 58, 40, 92, 76, 70, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 226, 225, 222, 141, 104, 111, 140, 144, 109, 77, 41, 49, 87, 64, 42, 197, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 221, 227, 223, 224, 228, 227, 220, 166, 129, 116, 46, 74, 89, 42, 40, 155, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 224, 224, 224, 227, 223, 169, 130, 129, 129, 88, 100, 58, 37, 62, 176, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 226, 226, 226, 226, 216, 134, 130, 127, 130, 118, 76, 42, 54, 92, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 226, 223, 228, 225, 228, 221, 182, 131, 131, 129, 128, 112, 41, 56, 95, 182, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 202, 212, 209, 212, 220, 225, 225, 153, 129, 125, 127, 130, 120, 86, 118, 208, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 176, 176, 193, 191, 198, 201, 209, 134, 129, 128, 128, 127, 128, 185, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 154, 149, 152, 166, 168, 174, 181, 130, 128, 131, 131, 123, 128, 125, 189, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 142, 116, 123, 128, 138, 140, 145, 136, 128, 124, 131, 128, 130, 131, 133, 222, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 206, 184, 224, 178, 158, 145, 108, 124, 131, 125, 130, 131, 129, 127, 130, 130, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 225, 221, 226, 224, 222, 102, 100, 128, 131, 125, 127, 128, 128, 127, 129, 144, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 227, 224, 227, 224, 194, 125, 117, 122, 128, 128, 124, 130, 128, 126, 129, 132, 145, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 255, 255, 213, 255, 255, 255, 255, 255, 255, 225, 212, 198, 181, 160, 127, 89, 77, 193, 255, 255, 255, 19, 1, 0, 0, 1, 0, 5, 0, 1, 3, 0, 34, 201, 255, 255, 189, 108, 38, 1, 1, 2, 0, 2, 52, 201, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 131, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 5, 0, 1, 6, 128, 208, 196, 179, 132, 133, 255, 212, 158, 81, 3, 0, 1, 0, 4, 69, 214, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 208, 193, 199, 208, 206, 205, 198, 193, 180, 166, 149, 123, 87, 73, 138, 217, 255, 255, 255, 104, 0, 1, 1, 3, 1, 2, 9, 0, 0, 5, 36, 193, 226, 211, 169, 107, 2, 7, 0, 6, 6, 75, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 2, 4, 80, 194, 185, 173, 149, 104, 145, 255, 210, 147, 62, 4, 6, 2, 0, 74, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 205, 186, 168, 154, 151, 140, 120, 95, 70, 86, 139, 143, 125, 255, 255, 255, 118, 4, 2, 1, 1, 6, 0, 0, 1, 0, 0, 35, 141, 165, 167, 113, 72, 2, 0, 3, 8, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 165, 4, 1, 1, 1, 0, 0, 1, 1, 1, 0, 3, 1, 7, 76, 95, 149, 156, 147, 123, 89, 143, 206, 181, 111, 36, 3, 0, 6, 73, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 214, 177, 136, 105, 81, 113, 145, 156, 88, 84, 255, 255, 255, 197, 4, 3, 1, 1, 1, 1, 1, 4, 0, 5, 23, 130, 85, 91, 110, 5, 6, 2, 32, 196, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 71, 9, 1, 1, 0, 0, 0, 0, 1, 1, 3, 0, 2, 46, 151, 172, 140, 132, 117, 97, 65, 121, 122, 127, 72, 3, 1, 5, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 204, 188, 165, 145, 120, 82, 69, 182, 255, 255, 255, 64, 2, 4, 1, 0, 6, 1, 0, 3, 0, 10, 133, 139, 134, 30, 3, 2, 72, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 17, 2, 1, 1, 0, 0, 0, 0, 1, 1, 0, 6, 7, 113, 140, 120, 120, 91, 88, 66, 73, 126, 97, 108, 42, 2, 5, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 224, 210, 196, 179, 161, 138, 118, 83, 60, 141, 255, 255, 255, 255, 100, 29, 3, 1, 1, 1, 0, 6, 2, 4, 56, 121, 33, 5, 6, 127, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 6, 4, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 48, 103, 73, 69, 112, 68, 64, 78, 108, 150, 162, 73, 6, 15, 134, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 219, 211, 199, 186, 169, 154, 135, 106, 159, 213, 169, 203, 255, 255, 255, 255, 255, 219, 152, 93, 41, 9, 0, 0, 0, 8, 2, 3, 20, 159, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 168, 0, 2, 1, 0, 0, 1, 1, 1, 1, 1, 0, 5, 97, 157, 141, 104, 89, 71, 95, 106, 135, 94, 22, 7, 14, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 227, 222, 218, 207, 199, 187, 176, 162, 147, 126, 114, 255, 255, 170, 113, 135, 255, 255, 255, 255, 255, 255, 255, 255, 255, 179, 100, 48, 11, 4, 57, 209, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 123, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 6, 164, 204, 176, 133, 65, 3, 3, 2, 0, 7, 3, 15, 199, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 226, 228, 227, 224, 222, 216, 209, 204, 196, 185, 174, 163, 153, 134, 115, 151, 255, 209, 157, 103, 67, 216, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 94, 0, 1, 2, 0, 3, 1, 0, 2, 0, 1, 1, 25, 220, 255, 203, 147, 63, 7, 0, 1, 2, 8, 35, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 215, 211, 211, 203, 209, 202, 196, 188, 178, 172, 165, 150, 138, 125, 105, 151, 255, 184, 133, 86, 66, 156, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 91, 5, 0, 0, 5, 2, 2, 5, 0, 0, 5, 0, 42, 255, 255, 200, 134, 46, 0, 2, 3, 2, 49, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 194, 182, 172, 197, 193, 185, 185, 174, 169, 161, 149, 145, 126, 114, 94, 131, 200, 162, 118, 79, 68, 129, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 93, 0, 0, 0, 3, 0, 0, 0, 2, 6, 0, 4, 52, 206, 210, 176, 98, 19, 5, 3, 0, 53, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 198, 111, 36, 182, 173, 177, 163, 164, 157, 143, 135, 129, 112, 101, 83, 82, 177, 135, 97, 62, 84, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 162, 0, 1, 3, 0, 1, 5, 0, 0, 4, 2, 2, 60, 141, 158, 129, 86, 2, 0, 6, 74, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 229, 143, 2, 165, 165, 159, 152, 63, 61, 135, 123, 115, 104, 89, 70, 59, 128, 113, 79, 66, 103, 160, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 196, 8, 0, 0, 1, 2, 0, 4, 5, 0, 1, 0, 48, 124, 81, 88, 45, 5, 3, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 164, 7, 111, 147, 146, 140, 41, 28, 123, 112, 99, 87, 75, 60, 63, 87, 89, 65, 80, 131, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 73, 2, 2, 0, 3, 0, 0, 2, 0, 3, 0, 38, 149, 142, 74, 0, 0, 103, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 44, 60, 132, 126, 129, 43, 11, 103, 96, 90, 73, 61, 62, 71, 100, 90, 93, 128, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 107, 46, 11, 0, 2, 4, 0, 0, 1, 2, 8, 100, 50, 5, 14, 136, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_square(levels, thicnkess, depth, invert);

src/experimental/demo/photo_torus.scad

@@ -0,0 +1,112 @@
+use <experimental/sf_torus.scad>;
+
+radius = [100, 50];
+thickness = 10;
+depth = 5;
+angle = [180, 180];
+twist = -90;
+invert = false;
+levels = [
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 180, 219, 255, 255, 224, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
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+    [255, 255, 255, 215, 211, 211, 203, 209, 202, 196, 188, 178, 172, 165, 150, 138, 125, 105, 151, 255, 184, 133, 86, 66, 156, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 91, 5, 0, 0, 5, 2, 2, 5, 0, 0, 5, 0, 42, 255, 255, 200, 134, 46, 0, 2, 3, 2, 49, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 194, 182, 172, 197, 193, 185, 185, 174, 169, 161, 149, 145, 126, 114, 94, 131, 200, 162, 118, 79, 68, 129, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 93, 0, 0, 0, 3, 0, 0, 0, 2, 6, 0, 4, 52, 206, 210, 176, 98, 19, 5, 3, 0, 53, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 198, 111, 36, 182, 173, 177, 163, 164, 157, 143, 135, 129, 112, 101, 83, 82, 177, 135, 97, 62, 84, 138, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 162, 0, 1, 3, 0, 1, 5, 0, 0, 4, 2, 2, 60, 141, 158, 129, 86, 2, 0, 6, 74, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 229, 143, 2, 165, 165, 159, 152, 63, 61, 135, 123, 115, 104, 89, 70, 59, 128, 113, 79, 66, 103, 160, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 196, 8, 0, 0, 1, 2, 0, 4, 5, 0, 1, 0, 48, 124, 81, 88, 45, 5, 3, 105, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 164, 7, 111, 147, 146, 140, 41, 28, 123, 112, 99, 87, 75, 60, 63, 87, 89, 65, 80, 131, 210, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 73, 2, 2, 0, 3, 0, 0, 2, 0, 3, 0, 38, 149, 142, 74, 0, 0, 103, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 44, 60, 132, 126, 129, 43, 11, 103, 96, 90, 73, 61, 62, 71, 100, 90, 93, 128, 192, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 107, 46, 11, 0, 2, 4, 0, 0, 1, 2, 8, 100, 50, 5, 14, 136, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 147, 21, 115, 114, 106, 64, 3, 71, 83, 70, 58, 56, 73, 92, 112, 144, 177, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 188, 118, 56, 17, 6, 2, 10, 0, 3, 3, 11, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 48, 68, 95, 94, 72, 2, 33, 68, 53, 64, 73, 91, 114, 136, 163, 211, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 186, 127, 58, 8, 2, 25, 169, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 210, 102, 76, 69, 67, 12, 14, 53, 67, 77, 89, 108, 138, 158, 206, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 204, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 229, 139, 79, 57, 0, 58, 90, 102, 116, 140, 158, 212, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 228, 169, 135, 124, 128, 136, 167, 198, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255], 
+    [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+];
+
+sf_torus(levels, radius, thickness, depth, angle, twist, invert);

src/experimental/demo/pnoise1_demo.scad

@@ -0,0 +1,18 @@
+use <hull_polyline2d.scad>;
+use <util/rand.scad>;
+use <experimental/zip2.scad>;
+use <experimental/pnoise1.scad>;
+use <experimental/pnoise1s.scad>;
+
+seed = rand();
+hull_polyline2d(
+    [for(x = [0:.1:10]) [x, pnoise1(x, seed)]], width = .1
+);
+
+xs = [for(x = [0:.2:8.3]) x];
+ys = pnoise1s(xs);
+
+translate([0, 2])
+    hull_polyline2d(
+        zip2(xs, ys), width = .1
+    );

src/experimental/demo/pnoise2_demo.scad

@@ -0,0 +1,48 @@
+use <util/rand.scad>;
+use <function_grapher.scad>;
+use <experimental/pnoise2s.scad>;
+
+module demo1() {
+    points = [
+        for(y = [0:.2:10])
+            for(x = [0:.2:10])
+                [x, y]
+    ];
+    noise = pnoise2s(points);
+    
+    for(i = [0:len(points) - 1]) {
+        c = (noise[i] + 1.1) / 2;
+        color([c, c, c])
+        translate(points[i])
+            square(.2);
+    }
+}
+
+
+module demo2() {
+    points = [
+        for(y = [0:.2:10])
+            [
+                for(x = [0:.2:10])
+                [x, y]
+            ]
+    ];
+
+    seed = rand(0, 256);
+    function_grapher(
+        [
+            for(ri = [0:len(points) - 1])
+                let(ns = pnoise2s(points[ri], seed))
+                    [
+                        for(ci = [0:len(ns) - 1])
+                            [points[ri][ci][0], points[ri][ci][1], ns[ci]]
+                    ]
+        ], 
+        0.25)
+    ;
+}
+
+demo1();
+
+translate([12, 0]) 
+    demo2();

src/experimental/demo/pnoise3_demo.scad

@@ -0,0 +1,70 @@
+use <util/rand.scad>;
+use <experimental/pnoise2s.scad>;
+use <experimental/pnoise3s.scad>;
+
+module demo1() {
+    for(z = [0:.2:5]) {
+        points = [
+            for(y = [0:.2:5])
+                for(x = [0:.2:5])
+                    [x, y, z]
+        ];    
+        noise = pnoise3s(points, 3);
+        for(i = [0:len(points) - 1]) {
+            alpha = abs(noise[i] + .5);            
+            color([.75, .75, .75, alpha < 0 ? 0 : alpha > 1 ? 1 : alpha])
+            translate(points[i])
+                cube(.2);
+        }
+    }
+}
+
+module demo2() {
+    points = [
+        for(y = [0:.2:10])
+            [
+                for(x = [0:.2:10])
+                [x, y]
+            ]
+    ];
+    
+    seed = rand(0, 256);
+    
+    points_with_h = [
+            for(ri = [0:len(points) - 1])
+                let(ns = pnoise2s(points[ri], seed))
+                    [
+                        for(ci = [0:len(ns) - 1])
+                            [points[ri][ci][0], points[ri][ci][1], ns[ci] + 1]
+                    ]
+        ];
+    
+    h_scale = 1.5;
+    for(row = points_with_h) {        
+        for(i = [0:len(row) - 1]) {
+            p = row[i];
+            pts = [
+                for(z = [0:.2:p[2] * h_scale]) [p[0], p[1], z]
+            ];
+            noise = pnoise3s(pts, seed);
+            for(j = [0:len(pts) - 1]) {
+                if(noise[j] > 0) {
+                    color(
+                        pts[j][2] < 1.25 ? "green" : 
+                        pts[j][2] < 1.75 ? "Olive" : "white")
+                    translate(pts[j])
+                        cube(.2);
+                }           
+            }
+        }
+    }
+    
+    color("LimeGreen")
+    linear_extrude(.2)
+        square(10);
+}
+
+demo1();
+
+translate([8, 0]) 
+    demo2();

src/experimental/demo/pnoise_counter_demo.scad

@@ -0,0 +1,15 @@
+use <hull_polyline2d.scad>;
+use <experimental/pnoise_contour.scad>;
+
+for(y = [0:2:4]) {
+    for(x = [0:2:4]) {
+        hull_polyline2d(pnoise_contour(x, y, noise = 0.025, steps = 200), width = .1, $fn = 4);
+    }
+}
+
+translate([10, 0]) 
+for(y = [0:2:4]) {
+    for(x = [0:2:4]) {
+        hull_polyline2d(pnoise_contour(x, y, steps = 100), width = .05, $fn = 4);
+    }
+}

src/experimental/demo/px_surround_demo.scad

@@ -0,0 +1,27 @@
+use <pixel/px_circle.scad>;
+use <pixel/px_polyline.scad>;
+use <shape_pentagram.scad>;
+use <hull_polyline2d.scad>;
+use <experimental/px_surround.scad>;
+
+pts = px_circle(10, true);
+for(p = pts) {
+    translate(p)
+        square(1, center = true);
+}
+#hull_polyline2d(px_surround(pts), width = .1);
+
+
+pentagram = [
+    for(pt = shape_pentagram(15)) 
+        [round(pt[0]), round(pt[1])]
+];
+pts2 = px_polyline(concat(pentagram, [pentagram[0]]));
+translate([30, 0]) {
+    for(pt = pts2) {
+        translate(pt) 
+            linear_extrude(1, scale = 0.5) 
+                square(1, center = true);
+    }
+    #hull_polyline2d(px_surround(pts2), width = .1);
+}

src/experimental/demo/tri_delaunay_demo.scad

@@ -0,0 +1,16 @@
+use <hull_polyline2d.scad>;
+use <experimental/tri_delaunay.scad>;
+   
+points=[for(i = [0:50]) rands(-20, 20, 2)];
+
+for(tri = tri_delaunay(points)) {
+    hull_polyline2d(
+        [points[tri[0]], points[tri[1]], points[tri[2]], points[tri[0]]], width = .2
+    );
+}
+
+color("red")
+for(point = points) {
+   translate(point) 
+       circle(.5);
+}

src/experimental/demo/triangulate_tri_bisectors_demo.scad

@@ -0,0 +1,14 @@
+use <hull_polyline2d.scad>;
+use <triangulate.scad>; 
+use <shape_starburst.scad>;
+use <experimental/tri_bisectors.scad>;
+
+shape = shape_starburst(30, 12, 10);
+hull_polyline2d(concat(shape, [shape[0]]), width = 1);
+
+tris = triangulate(shape);
+for(tri = tris) {
+    for(line = tri_bisectors([for(idx = tri) shape[idx]])) {
+        hull_polyline2d(line, width = 1);
+    }
+}

src/experimental/demo/voronoi2d_cells_demo.scad

@@ -0,0 +1,32 @@
+use <hull_polyline2d.scad>;
+use <shape_square.scad>;
+use <experimental/voronoi2d_cells.scad>;
+
+xs1 = rands(-20, 20, 15);
+ys1 = rands(-20, 20, 15);
+points = [for(i = [0:len(xs1) - 1]) [xs1[i], ys1[i]]];
+
+function default_region_size(points) = 
+    let(
+        xs = [for(p = points) p[0]],
+        ys = [for(p = points) abs(p[1])]
+    )
+    max([(max(xs) -  min(xs) / 2), (max(ys) -  min(ys)) / 2]);
+
+size = default_region_size(points);  
+region_shape = shape_square(size, corner_r = size / 10);
+
+cells = voronoi2d_cells(points, region_shape);
+for(i = [0:len(points) - 1]) {
+    pt = points[i];
+    cell = cells[i];
+    
+    linear_extrude(1)
+        hull_polyline2d(concat(cell, [cell[0]]), width = 1);
+    
+    color(rands(0, 1, 3))
+    translate(pt)    
+    linear_extrude(2, scale = 0.8)
+    translate(-pt)    
+        polygon(cell);
+}

src/experimental/demo/voronoi2d_lines_demo.scad

@@ -0,0 +1,30 @@
+use <hull_polyline2d.scad>;
+use <experimental/voronoi2d_lines.scad>;
+use <experimental/convex_hull.scad>;
+
+pt_nums = 50;
+width = 1;
+points = [for(i = [0:pt_nums - 1]) rands(-50, 50, 2)];   
+
+hull_pts = convex_hull(points);
+hull_polyline2d(
+    concat(hull_pts, [hull_pts[0]]), 
+    width = width, $fn = 4
+);
+  
+intersection() {  
+    for(line = voronoi2d_lines(points)) {
+        hull_polyline2d(
+            line, 
+            width = width,
+            $fn = 4
+        );
+    }
+    
+    polygon(hull_pts);
+}
+
+#for(p = points) {
+    translate(p)
+        circle(.5);
+}

src/experimental/flat.scad

@@ -0,0 +1 @@
+function flat(lt) = [for(row_pts = lt) each row_pts];

src/experimental/gcd.scad

@@ -0,0 +1 @@
+function gcd(m, n) = n == 0 ? m : gcd(n, m % n);

src/experimental/hollow_out_sweep.scad

@@ -0,0 +1,55 @@
+use <util/rand.scad>;
+use <line3d.scad>;
+use <hull_polyline3d.scad>;
+use <experimental/tri_bisectors.scad>;
+
+// style: LINES or HULL_LINES
+module hollow_out_sweep(sections, thickness, closed = false, style = "LINES") {
+    function rects(sects) = 
+        let(
+            sects_leng = len(sects),
+            shape_pt_leng = len(sects[0])
+        )
+        [
+            for(i = [0:sects_leng - 2])
+                let(
+                    sect1 = sects[i],
+                    sect2 = sects[i + 1]
+                )
+                for(j = [0:shape_pt_leng - 1])
+                    let(k = (j + 1) % shape_pt_leng)
+                    [sect1[j], sect1[k], sect2[k], sect2[j]]
+        ];
+        
+    function rand_tris(rect) =
+        let(
+            i = ceil(rand() * 10) % 2
+        )
+        i == 0 ?
+            [[rect[0], rect[1], rect[2]], [rect[0], rect[2], rect[3]]] :
+            [[rect[1], rect[2], rect[3]], [rect[1], rect[3], rect[0]]];        
+    
+    sects = closed ? concat(sections, [sections[0]]) : sections;
+    lines = [
+        for(rect = rects(sects)) 
+            for(tri = rand_tris(rect)) 
+                each tri_bisectors(tri) 
+    ];
+
+    if(style == "LINES") {
+        for(line = lines) {
+            line3d(
+                p1 = line[0], 
+                p2 = line[1],
+                thickness = thickness, 
+                p1Style = "CAP_SPHERE", 
+                p2Style = "CAP_SPHERE"
+            );
+        }
+    }   
+    else if(style == "HULL_LINES") { 
+        for(line = lines) {
+            hull_polyline3d(line, thickness = thickness);
+        }
+    }
+}

src/experimental/intersection_p.scad

@@ -0,0 +1,9 @@
+use <__comm__/__line_intersection.scad>;
+use <__comm__/__in_line.scad>;
+
+function intersection_p(line_pts1, line_pts2, ext = false, epsilon = 0.0001) =
+     let(
+         pt = __line_intersection(line_pts1, line_pts2, epsilon)
+     )
+     ext ? pt :
+     pt != [] && __in_line(line_pts1, pt, epsilon) && __in_line(line_pts2, pt, epsilon) ? pt : [];

src/experimental/lcm.scad

@@ -0,0 +1,3 @@
+use <experimental/gcd.scad>;
+
+function lcm(m, n) = m * n / gcd(m, n);

src/experimental/loft.scad

@@ -0,0 +1,56 @@
+use <experimental/lcm.scad>;
+use <experimental/sweep.scad>;
+   
+module loft(sections, slices = 1) {
+    function inter_pts(p1, p2, n) =
+        let(
+            v = p2 - p1,
+            dx = v[0] / n,
+            dy = v[1] / n,
+            dz = v[2] / n
+        )
+        [for(i = [1:n - 1]) p1 + [dx, dy, dz] * i];
+
+    function _interpolate(sect, leng, n, i = 0) = 
+        i == leng ? [] :
+        let(
+            p1 = sect[i],
+            p2 = sect[(i + 1) % leng]
+        )
+        concat(
+            [p1], 
+            inter_pts(p1, p2, n),
+            _interpolate(sect, leng, n, i + 1)
+        );
+
+    function interpolate(sect, n) = 
+        n <= 1 ? sect : _interpolate(sect, len(sect), n);
+        
+    module _loft(sect1, sect2, slices) {
+        function inter_sects(s1, s2, s_leng, slices) = 
+            slices == 1 ? [] : 
+                let(
+                    dps = [
+                        for(i = [0:lcm_n - 1])
+                        (s2[i] - s1[i]) / slices
+                    ]
+                )
+                [for(i = [1:slices - 1]) s1 + dps * i];
+
+        lcm_n = lcm(len(sect1), len(sect2));
+        new_sect1 = interpolate(sect1, lcm_n / len(sect1));
+        new_sect2 = interpolate(sect2, lcm_n / len(sect2));
+        
+        sweep(
+            concat(
+                [new_sect1],
+                inter_sects(new_sect1, new_sect2, lcm_n, slices),
+                [new_sect2]
+            )
+        );
+    }
+        
+    for(i = [0:len(sections) - 2]) {
+        _loft(sections[i], sections[i + 1], slices);
+    }
+}

src/experimental/m_determinant.scad

@@ -0,0 +1,3 @@
+use <experimental/_impl/_m_determinant_impl.scad>;
+
+function m_determinant(matrix) = _m_determinant(matrix);

src/experimental/mz_blocks.scad

@@ -0,0 +1,8 @@
+use <experimental/_impl/_mz_blocks_impl.scad>;
+
+function mz_blocks(start, rows, columns, maze, x_circular = false, y_circular = false) = 
+    go_maze( 
+        start[0], start[1],   // starting point
+        is_undef(maze) ? starting_maze(rows, columns) : maze,  
+        rows, columns, x_circular, y_circular
+    );

src/experimental/mz_get.scad

@@ -0,0 +1,9 @@
+function mz_get(block, query) = 
+    let(
+        i = search(query, [
+            ["x", 0],
+            ["y", 1],
+            ["w", 2]
+ 	    ])[0]
+    )
+    i != 2 ? block[i] : ["NO_WALL", "UPPER_WALL", "RIGHT_WALL", "UPPER_RIGHT_WALL"][block[i]];

src/experimental/mz_hamiltonian.scad

@@ -0,0 +1,31 @@
+use <experimental/_impl/_mz_hamiltonian_impl.scad>;
+use <experimental/mz_blocks.scad>;
+use <experimental/mz_get.scad>;
+use <util/sort.scad>;
+use <util/dedup.scad>;
+
+function mz_hamiltonian(rows, columns, start) =
+    let(
+        blocks = mz_blocks(
+            [1, 1],  
+            rows, columns
+        ),
+        all = concat(
+            [
+                for(block = blocks)
+                let(
+                    x = mz_get(block, "x"),
+                    y = mz_get(block, "y"),
+                    wall_type = mz_get(block, "w"),
+                    pts = wall_type == "UPPER_WALL" ? _mz_hamiltonian_upper(x, y) :
+                wall_type == "RIGHT_WALL" ? _mz_hamiltonian_right(x, y) :
+                wall_type == "UPPER_RIGHT_WALL" ? _mz_hamiltonian_upper_right(x, y) : []
+                )
+                each pts
+            ],
+            [for(x = [0:columns * 2 - 1]) [x, 0]],
+            [for(y = [0:rows * 2 - 1]) [0, y]]
+        ),
+        dot_pts = dedup(sort(all, by = "vt"), sorted = true)
+    )
+    _mz_hamiltonian_travel(dot_pts, start, rows * columns * 4);

src/experimental/mz_walls.scad

@@ -0,0 +1,15 @@
+use <experimental/_impl/_mz_walls_impl.scad>;
+
+function mz_walls(blocks, rows, columns, block_width, left_border = true, bottom_border = true) = 
+    let(
+        left_walls = left_border ? [for(y = [0:rows - 1]) [[0, block_width * (y + 1)], [0, block_width * y]]] : [],
+        buttom_walls = bottom_border ? [for(x = [0:columns - 1]) [[block_width * x, 0], [block_width * (x + 1), 0]]] : []
+    )
+     concat(
+        [
+            for(block = blocks) 
+            let(pts = block_walls(block, block_width))
+            if(pts != []) pts
+        ]
+        , left_walls, buttom_walls
+    );

src/experimental/note.md

@@ -0,0 +1,14 @@
+- deprecate `polysections`, use `sweep`.
+- deprecate `trianglate`, use `tri_ear_clipping`.
+- `sort` supports a list of ints?
+- `px_union`, `px_intersection`, `px_difference`?
+- `bsearch` supports `by`, `idx`?
+- `bsearch` supports a list of ints?
+
+Preview
+
+- `sweep`
+- `util/has`
+- `util/dedup`
+- `util/bsearch` for a sorted lt by z, y, x
+- `util/sort` supports `by = "vt"`

src/experimental/pnoise1.scad

@@ -0,0 +1,4 @@
+use <util/rand.scad>;
+use <experimental/_impl/_pnoise1_impl.scad>;
+
+function pnoise1(x, seed) = _pnoise1_impl(x, seed % 256);

src/experimental/pnoise1s.scad

@@ -0,0 +1,6 @@
+use <util/rand.scad>;
+use <experimental/_impl/_pnoise1_impl.scad>;
+
+function pnoise1s(xs, seed) = 
+    let(sd = is_undef(seed) ? floor(rand(0, 256)) : seed % 256)
+    [for(x = xs) _pnoise1_impl(x, sd)];

src/experimental/pnoise2.scad

@@ -0,0 +1,4 @@
+use <util/rand.scad>;
+use <experimental/_impl/_pnoise2_impl.scad>;
+
+function pnoise2(x, y, seed) = _pnoise2(x, y, seed % 256);

src/experimental/pnoise2s.scad

@@ -0,0 +1,6 @@
+use <util/rand.scad>;
+use <experimental/_impl/_pnoise2_impl.scad>;
+
+function pnoise2s(points, seed) = 
+    let(sd = is_undef(seed) ? floor(rand(0, 256)) : seed % 256)
+    [for(p = points) _pnoise2(p[0], p[1], sd)];