update readme

README.md

@@ -1,133 +1,164 @@
-# dotSCAD 1.3
+# dotSCAD 2.2
 
-> Reduce the burden of 3D modeling in mathematics. Compatible with OpenSCAD 2015.03 or laters.
+> **Reduce the burden of 3D modeling in mathematics.**
 
-![dotSCAD](WhirlingTaiwan.JPG)
+![dotSCAD](featured_img/LeopardCatTaiwan.JPG)
 
-[![license/LGPL](https://img.shields.io/badge/license-LGPL-blue.svg)](https://github.com/JustinSDK/lib-openscad/blob/master/LICENSE)
+[![license/LGPL](LICENSE.svg)](https://github.com/JustinSDK/lib-openscad/blob/master/LICENSE)
 
 ## Introduction
 
+**Based on OpenSCAD 2019.05.** For old OpenSCAD versions, please use dotSCAD 1.3. You can download all versions from the [releases](https://github.com/JustinSDK/dotSCAD/releases).
+
 OpenSCAD uses three library locations, the installation library, built-in library, and user defined libraries. It's convenient to set `OPENSCADPATH`. Check [Setting OPENSCADPATH](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries#Setting_OPENSCADPATH) in [OpenSCAD User Manual/Libraries](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries) for details.
 
-Every module or function is located in the file which has the same name as the module or the function. For example, if you want to use the `line2d` module to draw a line, `include <line2d.scad>;` first. 
+Every module or function is located in the file which has the same name as the module or the function. For example, if you want to use the `line2d` module to draw a line, `use <line2d.scad>;` first. 
 
-	include <line2d.scad>;
+	use <line2d.scad>;
 
 	line2d(p1 = [0, 0], p2 = [5, 0], width = 1);
 
-Some modules depend on other modules. For example, the `polyline2d` module depends on the `line2d` module, so you also have to `include <line2d.scad>;` besides `include <polyline3d.scad>;`. 
+Some module files are organized in a directory. For example, px_circle.scad exists in `pixel` directory. You have to prefix the directory name when including `px_circle`.
 
-	include <line2d.scad>;
-	include <polyline3d.scad>;
+    use <pixel/px_circle.scad>;
+	
+	points = px_circle(radius = 10);
+	for(pt = points) {
+        translate(pt) square(1);
+	}
 
-	polyline2d(points = [[1, 2], [-5, -4], [-5, 3], [5, 5]], width = 1);
+## Examples
 
-If OpenSCAD generates "WARNING: Ignoring unknown xxx function" or "WARNING: Ignoring unknown xxx module" when using one module of dotSCAD. Just try to `include <xxx.scad>;`.
+See [examples](examples).
 
-Too many dependencies? Because OpenSCAD doesn't provide namespace management, I personally think that exposing dependencies is better than hiding them. In this way, users can have their own way to manage dependencies. How to categorize dependencies is up to you. For example, you can include your commonly-used modules and functions in "commonly_used.scad" and then `include <commonly_used.scad>;` in the ".scad" file of your project.
+![examples](examples/images/gallery.JPG)
 
 ## Documentation
 
 - 2D
-    - [arc](https://openhome.cc/eGossip/OpenSCAD/lib-arc.html)
-	- [pie](https://openhome.cc/eGossip/OpenSCAD/lib-pie.html)
-	- [rounded_square](https://openhome.cc/eGossip/OpenSCAD/lib-rounded_square.html)
-	- [line2d](https://openhome.cc/eGossip/OpenSCAD/lib-line2d.html)
-	- [polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib-polyline2d.html)
-	- [hull_polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib-hull_polyline2d.html)
-	- [hexagons](https://openhome.cc/eGossip/OpenSCAD/lib-hexagons.html)
-	- [polytransversals](https://openhome.cc/eGossip/OpenSCAD/lib-polytransversals.html)
-    - [multi_line_text](https://openhome.cc/eGossip/OpenSCAD/lib-multi_line_text.html)
-	- [voronoi2d](https://openhome.cc/eGossip/OpenSCAD/lib-voronoi2d.html)
+    - [arc](https://openhome.cc/eGossip/OpenSCAD/lib2x-arc.html)
+	- [pie](https://openhome.cc/eGossip/OpenSCAD/lib2x-pie.html)
+	- [rounded_square](https://openhome.cc/eGossip/OpenSCAD/lib2x-rounded_square.html)
+	- [line2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-line2d.html)
+	- [polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-polyline2d.html)
+	- [hull_polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-hull_polyline2d.html)
+	- [hexagons](https://openhome.cc/eGossip/OpenSCAD/lib2x-hexagons.html)
+	- [polytransversals](https://openhome.cc/eGossip/OpenSCAD/lib2x-polytransversals.html)
+    - [multi_line_text](https://openhome.cc/eGossip/OpenSCAD/lib2x-multi_line_text.html)
+	- [voronoi2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-voronoi2d.html)
 
 - 3D
-	- [rounded_cube](https://openhome.cc/eGossip/OpenSCAD/lib-rounded_cube.html)
-    - [rounded_cylinder](https://openhome.cc/eGossip/OpenSCAD/lib-rounded_cylinder.html)
-    - [crystal_ball](https://openhome.cc/eGossip/OpenSCAD/lib-crystal_ball.html)
-	- [line3d](https://openhome.cc/eGossip/OpenSCAD/lib-line3d.html)
-	- [polyline3d](https://openhome.cc/eGossip/OpenSCAD/lib-polyline3d.html)
-	- [hull_polyline3d](https://openhome.cc/eGossip/OpenSCAD/lib-hull_polyline3d.html)
-	- [function_grapher](https://openhome.cc/eGossip/OpenSCAD/lib-function_grapher.html)
-	- [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html)
-	- [starburst](https://openhome.cc/eGossip/OpenSCAD/lib-starburst.html)
-	- [voronoi3d](https://openhome.cc/eGossip/OpenSCAD/lib-voronoi3d.html)
+	- [rounded_cube](https://openhome.cc/eGossip/OpenSCAD/lib2x-rounded_cube.html)
+    - [rounded_cylinder](https://openhome.cc/eGossip/OpenSCAD/lib2x-rounded_cylinder.html)
+    - [crystal_ball](https://openhome.cc/eGossip/OpenSCAD/lib2x-crystal_ball.html)
+	- [line3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-line3d.html)
+	- [polyline3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-polyline3d.html)
+	- [hull_polyline3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-hull_polyline3d.html)
+	- [function_grapher](https://openhome.cc/eGossip/OpenSCAD/lib2x-function_grapher.html)
+	- [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html)
+	- [starburst](https://openhome.cc/eGossip/OpenSCAD/lib2x-starburst.html)
+	- [voronoi3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-voronoi3d.html)
 	
 - Transformation
-    - [along_with](https://openhome.cc/eGossip/OpenSCAD/lib-along_with.html)
-	- [hollow_out](https://openhome.cc/eGossip/OpenSCAD/lib-hollow_out.html)
-	- [bend](https://openhome.cc/eGossip/OpenSCAD/lib-bend.html)
-	- [shear](https://openhome.cc/eGossip/OpenSCAD/lib-shear.html)
+    - [along_with](https://openhome.cc/eGossip/OpenSCAD/lib2x-along_with.html)
+	- [hollow_out](https://openhome.cc/eGossip/OpenSCAD/lib2x-hollow_out.html)
+	- [bend](https://openhome.cc/eGossip/OpenSCAD/lib2x-bend.html)
+	- [shear](https://openhome.cc/eGossip/OpenSCAD/lib2x-shear.html)
 
 - Functon
-	- [rotate_p](https://openhome.cc/eGossip/OpenSCAD/lib-rotate_p.html)
-	- [sub_str](https://openhome.cc/eGossip/OpenSCAD/lib-sub_str.html)
-	- [split_str](https://openhome.cc/eGossip/OpenSCAD/lib-split_str.html)
-	- [parse_number](https://openhome.cc/eGossip/OpenSCAD/lib-parse_number.html)
-	- [cross_sections](https://openhome.cc/eGossip/OpenSCAD/lib-cross_sections.html)
-	- [paths2sections](https://openhome.cc/eGossip/OpenSCAD/lib-paths2sections.html)
-	- [path_scaling_sections](https://openhome.cc/eGossip/OpenSCAD/lib-path_scaling_sections.html)
-	- [bijection_offset](https://openhome.cc/eGossip/OpenSCAD/lib-bijection_offset.html)
-	- [in_polyline](https://openhome.cc/eGossip/OpenSCAD/lib-in_polyline.html)
-	- [in_shape](https://openhome.cc/eGossip/OpenSCAD/lib-in_shape.html)
-	- [midpt_smooth](https://openhome.cc/eGossip/OpenSCAD/lib-midpt_smooth.html)
-	- [trim_shape](https://openhome.cc/eGossip/OpenSCAD/lib-trim_shape.html)
-	- [triangulate](https://openhome.cc/eGossip/OpenSCAD/lib-triangulate.html)
+	- [rotate_p](https://openhome.cc/eGossip/OpenSCAD/lib2x-rotate_p.html)
+	- [cross_sections](https://openhome.cc/eGossip/OpenSCAD/lib2x-cross_sections.html)
+	- [paths2sections](https://openhome.cc/eGossip/OpenSCAD/lib2x-paths2sections.html)
+	- [path_scaling_sections](https://openhome.cc/eGossip/OpenSCAD/lib2x-path_scaling_sections.html)
+	- [bijection_offset](https://openhome.cc/eGossip/OpenSCAD/lib2x-bijection_offset.html)
+	- [in_polyline](https://openhome.cc/eGossip/OpenSCAD/lib2x-in_polyline.html)
+	- [in_shape](https://openhome.cc/eGossip/OpenSCAD/lib2x-in_shape.html)
+	- [midpt_smooth](https://openhome.cc/eGossip/OpenSCAD/lib2x-midpt_smooth.html)
+	- [trim_shape](https://openhome.cc/eGossip/OpenSCAD/lib2x-trim_shape.html)
+	- [triangulate](https://openhome.cc/eGossip/OpenSCAD/lib2x-triangulate.html)
 	
 - Path
-    - [arc_path](https://openhome.cc/eGossip/OpenSCAD/lib-arc_path.html)
-	- [circle_path](https://openhome.cc/eGossip/OpenSCAD/lib-circle_path.html)
-    - [bezier_curve](https://openhome.cc/eGossip/OpenSCAD/lib-bezier_curve.html)
-	- [bezier_surface](https://openhome.cc/eGossip/OpenSCAD/lib-bezier_surface.html)
-	- [bezier_smooth](https://openhome.cc/eGossip/OpenSCAD/lib-bezier_smooth.html)
-    - [helix](https://openhome.cc/eGossip/OpenSCAD/lib-helix.html)
-    - [golden_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-golden_spiral.html)
-    - [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral.html)
-    - [sphere_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-sphere_spiral.html)
-	- [torus_knot](https://openhome.cc/eGossip/OpenSCAD/lib-torus_knot.html)
+    - [arc_path](https://openhome.cc/eGossip/OpenSCAD/lib2x-arc_path.html)
+	- [circle_path](https://openhome.cc/eGossip/OpenSCAD/lib2x-circle_path.html)
+    - [bspline_curve](https://openhome.cc/eGossip/OpenSCAD/lib2x-bspline_curve.html)
+	- [bezier_curve](https://openhome.cc/eGossip/OpenSCAD/lib2x-bezier_curve.html)
+	- [bezier_surface](https://openhome.cc/eGossip/OpenSCAD/lib2x-bezier_surface.html)
+	- [bezier_smooth](https://openhome.cc/eGossip/OpenSCAD/lib2x-bezier_smooth.html)
+    - [helix](https://openhome.cc/eGossip/OpenSCAD/lib2x-helix.html)
+    - [golden_spiral](https://openhome.cc/eGossip/OpenSCAD/lib2x-golden_spiral.html)
+    - [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib2x-archimedean_spiral.html)
+    - [sphere_spiral](https://openhome.cc/eGossip/OpenSCAD/lib2x-sphere_spiral.html)
+	- [torus_knot](https://openhome.cc/eGossip/OpenSCAD/lib2x-torus_knot.html)
 
 - Extrusion
-    - [box_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-box_extrude.html)
-	- [ellipse_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-ellipse_extrude.html)
-    - [stereographic_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-stereographic_extrude.html)
-	- [rounded_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-rounded_extrude.html)
+    - [box_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-box_extrude.html)
+	- [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)
 
 - 2D Shape
-    - [shape_taiwan](https://openhome.cc/eGossip/OpenSCAD/lib-shape_taiwan.html)
-	- [shape_arc](https://openhome.cc/eGossip/OpenSCAD/lib-shape_arc.html)
-	- [shape_pie](https://openhome.cc/eGossip/OpenSCAD/lib-shape_pie.html)
-	- [shape_ellipse](https://openhome.cc/eGossip/OpenSCAD/lib-shape_ellipse.html)
-    - [shape_square](https://openhome.cc/eGossip/OpenSCAD/lib-shape_square.html)
-	- [shape_trapezium](https://openhome.cc/eGossip/OpenSCAD/lib-shape_trapezium.html)
-	- [shape_cyclicpolygon](https://openhome.cc/eGossip/OpenSCAD/lib-shape_cyclicpolygon.html)
-    - [shape_pentagram](https://openhome.cc/eGossip/OpenSCAD/lib-shape_pentagram.html)	
-    - [shape_starburst](https://openhome.cc/eGossip/OpenSCAD/lib-shape_starburst.html)	    
-	- [shape_superformula](https://openhome.cc/eGossip/OpenSCAD/lib-shape_superformula.html)
-	- [shape_glued2circles](https://openhome.cc/eGossip/OpenSCAD/lib-shape_glued2circles.html)
-	- [shape_path_extend](https://openhome.cc/eGossip/OpenSCAD/lib-shape_path_extend.html)		
+    - [shape_taiwan](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_taiwan.html)
+	- [shape_arc](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_arc.html)
+	- [shape_pie](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_pie.html)
+	- [shape_ellipse](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_ellipse.html)
+    - [shape_square](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_square.html)
+	- [shape_trapezium](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_trapezium.html)
+	- [shape_cyclicpolygon](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_cyclicpolygon.html)
+    - [shape_pentagram](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_pentagram.html)	
+    - [shape_starburst](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_starburst.html)	    
+	- [shape_superformula](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_superformula.html)
+	- [shape_glued2circles](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_glued2circles.html)
+	- [shape_path_extend](https://openhome.cc/eGossip/OpenSCAD/lib2x-shape_path_extend.html)		
 
 - 2D Shape Extrusion
-	- [bend_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-bend_extrude.html)
-	- [path_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-path_extrude.html)
-	- [ring_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-ring_extrude.html)
-	- [helix_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-helix_extrude.html)
-	- [golden_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-golden_spiral_extrude.html)
-	- [archimedean_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral_extrude.html)
-	- [sphere_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-sphere_spiral_extrude.html)
+	- [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)
+	- [golden_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-golden_spiral_extrude.html)
+	- [archimedean_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-archimedean_spiral_extrude.html)
+	- [sphere_spiral_extrude](https://openhome.cc/eGossip/OpenSCAD/lib2x-sphere_spiral_extrude.html)
+
+- Utilities
+	- [util/sub_str](https://openhome.cc/eGossip/OpenSCAD/lib2x-sub_str.html)
+	- [util/split_str](https://openhome.cc/eGossip/OpenSCAD/lib2x-split_str.html)
+	- [util/parse_number](https://openhome.cc/eGossip/OpenSCAD/lib2x-parse_number.html)
+    - [util/reverse](https://openhome.cc/eGossip/OpenSCAD/lib2x-reverse.html)
+	- [util/slice](https://openhome.cc/eGossip/OpenSCAD/lib2x-slice.html)
+	- [util/sort](https://openhome.cc/eGossip/OpenSCAD/lib2x-sort.html)
+	- [util/rand](https://openhome.cc/eGossip/OpenSCAD/lib2x-rand.html)
+	- [util/fibseq](https://openhome.cc/eGossip/OpenSCAD/lib2x-fibseq.html)	
 
 - Matrix
-	- [m_cumulate](https://openhome.cc/eGossip/OpenSCAD/lib-m_cumulate.html)	
-	- [m_translation](https://openhome.cc/eGossip/OpenSCAD/lib-m_translation.html)
-	- [m_rotation](https://openhome.cc/eGossip/OpenSCAD/lib-m_rotation.html)
-	- [m_scaling](https://openhome.cc/eGossip/OpenSCAD/lib-m_scaling.html)
-	- [m_mirror](https://openhome.cc/eGossip/OpenSCAD/lib-m_mirror.html)
-	- [m_shearing](https://openhome.cc/eGossip/OpenSCAD/lib-m_shearing.html)
+	- [matrix/m_cumulate](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_cumulate.html)	
+	- [matrix/m_translation](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_translation.html)
+	- [matrix/m_rotation](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_rotation.html)
+	- [matrix/m_scaling](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_scaling.html)
+	- [matrix/m_mirror](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_mirror.html)
+	- [matrix/m_shearing](https://openhome.cc/eGossip/OpenSCAD/lib2x-m_shearing.html)
 
-- Other
-    - [turtle2d](https://openhome.cc/eGossip/OpenSCAD/lib-turtle2d.html)
-    - [turtle3d](https://openhome.cc/eGossip/OpenSCAD/lib-turtle3d.html)
-	- [log](https://openhome.cc/eGossip/OpenSCAD/lib-log.html)
+- Turtle
+    - [turtle/turtle2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-turtle2d.html)
+    - [turtle/turtle3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-turtle3d.html)
+    - [turtle/t2d](https://openhome.cc/eGossip/OpenSCAD/lib2x-t2d.html)
+    - [turtle/t3d](https://openhome.cc/eGossip/OpenSCAD/lib2x-t3d.html)
 
+- Pixel
+    - [pixel/px_line](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_line.html)
+	- [pixel/px_polyline](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_polyline.html)
+	- [pixel/px_circle](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_circle.html)
+	- [pixel/px_cylinder](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_cylinder.html)
+	- [pixel/px_sphere](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_sphere.html)
+	- [pixel/px_polygon](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_polygon.html)
+	- [pixel/px_from](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_from.html)
+    - [pixel/px_ascii](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_ascii.html)
+	- [pixel/px_gray](https://openhome.cc/eGossip/OpenSCAD/lib2x-px_gray.html)
+
+- Part
+    - [part/connector_peg](https://openhome.cc/eGossip/OpenSCAD/lib2x-connector_peg.html)
+	- [part/cone](https://openhome.cc/eGossip/OpenSCAD/lib2x-cone.html)
+	- [part/joint_T](https://openhome.cc/eGossip/OpenSCAD/lib2-joint_T.html)
+	
 ## Bugs and Feedback
 
 For bugs, questions and discussions please use the [Github Issues](https://github.com/JustinSDK/dotSCAD/issues).

RELEASE.md

@@ -1,5 +1,59 @@
 > Version numbers are based on [Semantic Versioning](https://semver.org/).
 
+# v2.2
+- Bugfixes
+  - `util/sort`: fix "search term not found" warning when `by` is `"idx"`.
+- Better dependency management. Just `use` modules you want. Existing scripts are not required to do any change.
+
+# v2.1
+- Bugfixes
+  - `bend_extrude`: fix wrong rotation.
+  - `bijection_offset`: fix point order.
+- New parameters.
+  - `box_extrude`: new `twist` parameter.
+  - `crystall_ball`: new `thickness` parameter.
+- New modules and functions.
+  - [bspline_curve](https://openhome.cc/eGossip/OpenSCAD/lib2-bspline_curve.html)
+  - [util/rand](https://openhome.cc/eGossip/OpenSCAD/lib2-rand.html)
+  - [util/fibseq](https://openhome.cc/eGossip/OpenSCAD/lib2-fibseq.html)
+  - [pixel/px_from](https://openhome.cc/eGossip/OpenSCAD/lib2-px_from.html)
+  - [pixel/px_ascii](https://openhome.cc/eGossip/OpenSCAD/lib2-px_ascii.html)
+  - [pixel/px_gray](https://openhome.cc/eGossip/OpenSCAD/lib2-px_gray.html)
+  - [part/connector_peg](https://openhome.cc/eGossip/OpenSCAD/lib2-connector_peg.html)
+  - [part/cone](https://openhome.cc/eGossip/OpenSCAD/lib2-cone.html)
+  - [part/joint_T](https://openhome.cc/eGossip/OpenSCAD/lib2-joint_T.html)
+  - [turtle/t2d](https://openhome.cc/eGossip/OpenSCAD/lib2-t2d.html)
+  - [turtle/t3d](https://openhome.cc/eGossip/OpenSCAD/lib2-t3d.html)  
+
+# v2.0
+- Use new features of OpenSCAD-2019.05 to refactor internal implementation.
+- Delete the `log` module which is never used.
+- Directory changed.
+  - `m_cumulate`, `m_mirror`, `m_rotation`, `m_scaling`, `m_shearing` and `m_translation` are moved into the `matrix` directory.
+  - `turtle2d` and `turtle3d` are moved into the `turtle` directory.
+  - `parse_number`, `split_str` and `sub_str` are moved into the `util` directory.
+- New modules and functions.
+  - [pixel/px_line](https://openhome.cc/eGossip/OpenSCAD/lib2-px_line.html)
+  - [pixel/px_polyline](https://openhome.cc/eGossip/OpenSCAD/lib2-px_polyline.html)
+  - [pixel/px_circle](https://openhome.cc/eGossip/OpenSCAD/lib2-px_circle.html)
+  - [pixel/px_cylinder](https://openhome.cc/eGossip/OpenSCAD/lib2-px_cylinder.html)
+  - [pixel/px_sphere](https://openhome.cc/eGossip/OpenSCAD/lib2-px_sphere.html)
+  - [pixel/px_polygon](https://openhome.cc/eGossip/OpenSCAD/lib2-px_polygon.html)
+  - [util/reverse](https://openhome.cc/eGossip/OpenSCAD/lib2-reverse.html)
+  - [util/slice](https://openhome.cc/eGossip/OpenSCAD/lib2-slice.html)
+  - [util/sort](https://openhome.cc/eGossip/OpenSCAD/lib2-sort.html)  
+
+# v1.3.3
+- Bugfixes
+  - `in_shape`: Wrong variable name.
+
+# v1.3.2
+- All-in-one source file.
+  - You can use `include <dotSCAD.scad>;` or `use <dotSCAD.scad>;` if you really don't want to care about dependencies.
+
+- Bugfixes
+  - `along_with`: Wrong variable scope.
+  
 # v1.3.1
 - Bugfixes
   - `in_polyline`: Wrong parameter name.

docs/lib-log.md

@@ -1,46 +0,0 @@
-# log
-
-A log module which supports simple level configurations and color titles. 
-
-## Parameters
-
-- `$log_level` : The accepted values are `"OFF"` (-1), `"INFO"` (20), 
-   `"WARNING"` (30), `"ERROR"` (40) or positive integers. The default value is `"INFO"`.
-- `level` : The accepted values are `"OFF"` (-1), `"INFO"` (20), 
-   `"WARNING"` (30), `"ERROR"` (40) or positive integers. If the value is greater or equal to `$log_level`, the `echo` message will display in the console.
-- `level_color` : Controls the color of level title. It accepts the same values as the CSS `color` property. 
-
-## Examples
-
-	include <log.scad>;
-	
-	log() 
-	    echo("    INFO message");
-	    
-	log("WARNING")
-	    echo("    WARNING message"); 
-	
-	log("ERROR") {
-	    echo("    ERROR message 1"); 
-	    echo("    ERROR message 2"); 
-	}
-
-![log](images/lib-log-1.JPG)
-
-	include <log.scad>;
-	
-	$log_level = "WARNING";
-	
-	log() 
-	    echo("    INFO message");
-	    
-	log("WARNING", "purple")
-	    echo("    WARNING message"); 
-	
-	log("ERROR", "rgb(255, 100, 100)") {
-	    echo("    ERROR message 1"); 
-	    echo("    ERROR message 2"); 
-	}
-
-![log](images/lib-log-2.JPG)
-

docs/lib-m_multiply.md

@@ -1,25 +0,0 @@
-# m_multiply
-
-Multiply two 4x4 transformation matrice.
-
-**Since:** 1.1
-
-## Parameters
-
-- `ma`, `mb` : Two 4x4 transformation matrice.
-
-## Examples
-
-	include <m_multiply.scad>;
-	include <m_scaling.scad>;
-	include <m_rotation.scad>;
-
-	ma = m_scaling([0.5, 1, 2]);
-	mb = m_rotation([0, 0, 90]);
-
-	cube(10);
-	multmatrix(m_multiply(ma, mb))
-		translate([15, 0, 0])  cube(10);
-
-![m_multiply](images/lib-m_multiply-1.JPG)
-

docs/lib-parse_number.md

@@ -1,16 +0,0 @@
-# parse_number
-
-Parses the string argument as an number. It depends on the `split_str` and the `sub_str` functions so remember to include split_str.scad and sub_str.scad.
-
-## Parameters
-
-- `t` : A string containing the number representation to be parsed.
-
-## Examples
-
-	include <sub_str.scad>;
-	include <split_str.scad>;
-    include <parse_number.scad>;
-    
-	echo(parse_number("10") + 1);    // ECHO: 11
-	echo(parse_number("-1.1") + 1);  // ECHO: -0.1

docs/lib2x-along_with.md

@@ -12,8 +12,8 @@ Puts children along the given path. If there's only one child, it will put the c
 
 ## Examples
 
-	include <along_with.scad>;
-	include <circle_path.scad>;
+	use <along_with.scad>;
+	use <circle_path.scad>;
 	
 	$fn = 24;
 	
@@ -24,8 +24,8 @@ Puts children along the given path. If there's only one child, it will put the c
 
 ![along_with](images/lib-along_with-1.JPG)
 
-	include <along_with.scad>;
-	include <circle_path.scad>;
+	use <along_with.scad>;
+	use <circle_path.scad>;
 
 	$fn = 24;
 
@@ -44,10 +44,8 @@ Puts children along the given path. If there's only one child, it will put the c
 
 ![along_with](images/lib-along_with-2.JPG)
 
-	include <along_with.scad>;
-	include <circle_path.scad>;
-	include <rotate_p.scad>;
-	include <golden_spiral.scad>;
+	use <along_with.scad>;
+	use <golden_spiral.scad>;
 
 	pts_angles = golden_spiral(
 		from = 5, 
@@ -65,8 +63,8 @@ Puts children along the given path. If there's only one child, it will put the c
 
 ![along_with](images/lib-along_with-3.JPG)
 
-	include <bezier_curve.scad>;
-	include <along_with.scad>;
+	use <bezier_curve.scad>;
+	use <along_with.scad>;
 
 	module scales() {
 		module one_scale() {

docs/lib2x-arc.md

@@ -6,13 +6,14 @@ Creates an arc. You can pass a 2 element vector to define the central angle. Its
 
 - `radius` : The radius of the circle.
 - `angle` : A single value or 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.
+- `width` : The width of the arc.
 - `width_mode` : The default value is `"LINE_CROSS"`. The arc line will move outward by `width / 2` and inward by `width / 2`. If it's `"LINE_OUTWARD"`, The arc line moves outward by `width`. The `"LINE_INWARD"` moves the arc line inward by `width`.
 - `$fa`, `$fs`, `$fn` : Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details.
 
 
 ## Examples
   
-    include <arc.scad>;
+    use <arc.scad>;
     
     $fn = 24;
     arc(radius = 20, angle = [45, 290], width = 2);
@@ -20,7 +21,7 @@ Creates an arc. You can pass a 2 element vector to define the central angle. Its
 
 ![arc](images/lib-arc-1.JPG)
 
-    include <arc.scad>;
+    use <arc.scad>;
     
     $fn = 24;
     arc(radius = 20, angle = [45, 290], width = 2, width_mode = "LINE_OUTWARD");
@@ -28,7 +29,7 @@ Creates an arc. You can pass a 2 element vector to define the central angle. Its
 
 ![arc](images/lib-arc-2.JPG)
 
-    include <arc.scad>;
+    use <arc.scad>;
     
     $fn = 24;
     arc(radius = 20, angle = [45, 290], width = 2, width_mode = "LINE_INWARD");

docs/lib2x-arc_path.md

@@ -11,8 +11,8 @@ Creates an arc path. You can pass a 2 element vector to define the central angle
 
 ## Examples
   
-    include <arc_path.scad>;
-    include <hull_polyline2d.scad>;
+    use <arc_path.scad>;
+    use <hull_polyline2d.scad>;
     
     $fn = 24;
     points = arc_path(radius = 20, angle = [45, 290]);
@@ -20,8 +20,8 @@ Creates an arc path. You can pass a 2 element vector to define the central angle
 
 ![arc_path](images/lib-arc_path-1.JPG)
 
-    include <arc_path.scad>;
-    include <hull_polyline2d.scad>;
+    use <arc_path.scad>;
+    use <hull_polyline2d.scad>;
     
     $fn = 24;
     points = arc_path(radius = 20, angle = 135);

docs/lib2x-archimedean_spiral.md

@@ -16,9 +16,8 @@ An `init_angle` less than 180 degrees is not recommended because the function us
 
 ## Examples
 
-    include <line2d.scad>;
-	include <polyline2d.scad>;
-    include <archimedean_spiral.scad>;
+	use <polyline2d.scad>;
+    use <archimedean_spiral.scad>;
 	
 	points_angles = archimedean_spiral(
 	    arm_distance = 10,
@@ -31,10 +30,9 @@ An `init_angle` less than 180 degrees is not recommended because the function us
 	
 	polyline2d(points, width = 1);
 
-
 ![archimedean_spiral](images/lib-archimedean_spiral-1.JPG)
 	
-    include <archimedean_spiral.scad>;
+    use <archimedean_spiral.scad>;
     
 	points_angles = archimedean_spiral(
 	    arm_distance = 10,  

docs/lib2x-archimedean_spiral_extrude.md

@@ -2,25 +2,19 @@
 
 Extrudes a 2D shape along the path of an archimedean spiral. 
 
-When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
-
-Dependencies: `rotate_p`, `archimedean_spiral`, `cross_sections`, `polysections`.
+When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 ## Parameters
 
 - `shape_pts` : A list of points represent a shape. See the example below.
-- `arm_distance`, `init_angle`, `point_distance`, `num_of_points` and `rt_dir` : See [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib-archimedean_spiral.html) for details.
+- `arm_distance`, `init_angle`, `point_distance`, `num_of_points` and `rt_dir` : See [archimedean_spiral](https://openhome.cc/eGossip/OpenSCAD/lib2x-archimedean_spiral.html) for details.
 - `twist` : The number of degrees of through which the shape is extruded.
 - `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/lib-polysections.html) for details.
+- `triangles` : `"SOLID"` (default), `"HOLLOW"` or user-defined indexes. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 ## Examples
     
-	include <archimedean_spiral.scad>;
-	include <rotate_p.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <archimedean_spiral_extrude.scad>;
+	use <archimedean_spiral_extrude.scad>;
 
 	shape_pts = [
 		[5, 0],

docs/lib2x-bend.md

@@ -12,7 +12,7 @@ Bends a 3D object into an arc shape.
 
 The containing cube of the target object should be laid down on the x-y plane. For example.
 
-    include <bend.scad>;
+    use <bend.scad>;
 
 	x = 9.25;
 	y = 9.55;
@@ -25,7 +25,7 @@ The containing cube of the target object should be laid down on the x-y plane. F
 
 Once you have the size of the containing cube, you can use it as the `size` argument of the `bend` module.
 
-    include <bend.scad>;
+    use <bend.scad>;
 
 	x = 9.25;
 	y = 9.55;
@@ -40,7 +40,7 @@ Once you have the size of the containing cube, you can use it as the `size` argu
 
 The arc shape is smoother if the `frags` value is larger. 
 
-    include <bend.scad>;
+    use <bend.scad>;
 	
 	x = 9.25;
 	y = 9.55;

docs/lib2x-bend_extrude.md

@@ -25,7 +25,7 @@ The containing square of the target shape should be laid down on the x-y plane.
 
 Once you have the size of the containing square, you can use it as the `size` argument of the `bend_extrude` module.
 
-	include <bend_extrude.scad>;
+	use <bend_extrude.scad>;
 
 	x = 9.25;
 	y = 9.55;

docs/lib2x-bezier_curve.md

@@ -5,14 +5,14 @@ Given a set of control points, the `bezier_curve` function returns points of the
 ## Parameters
 
 - `t_step` : The distance between two points of the Bézier path.
-- `points` : A set of `[x, y, z]` control points.
+- `points` : A list of `[x, y]` or `[x, y, z]` control points.
 
 ## Examples
 
 If you have four control points and combine with the `hull_polyline3d` module:
 
-    include <hull_polyline3d.scad>;
-	include <bezier_curve.scad>;
+    use <hull_polyline3d.scad>;
+	use <bezier_curve.scad>;
 
 	t_step = 0.05;
 	width = 2;

docs/lib2x-bezier_smooth.md

@@ -2,8 +2,6 @@
 
 Given a path, the `bezier_smooth` function uses bazier curves to smooth all corners. You can use it to create smooth lines or rounded shapes.
 
-Dependencies: the `bezier_curve` function.
-
 ## Parameters
 
 - `path_pts` : A list of points represent the path.
@@ -13,9 +11,8 @@ Dependencies: the `bezier_curve` function.
 
 ## Examples
 
-	include <hull_polyline3d.scad>;
-	include <bezier_curve.scad>;
-	include <bezier_smooth.scad>;
+	use <hull_polyline3d.scad>;
+	use <bezier_smooth.scad>;
 
 	width = 2;
 	round_d = 15;
@@ -39,8 +36,7 @@ Dependencies: the `bezier_curve` function.
 
 ![bezier_smooth](images/lib-bezier_smooth-1.JPG)
 
-	include <bezier_curve.scad>;
-	include <bezier_smooth.scad>;
+	use <bezier_smooth.scad>;
 
 	round_d = 10;
 

docs/lib2x-bezier_surface.md

@@ -2,8 +2,6 @@
 
 Given a set of control points, the `bezier_surface` function returns points of the Bézier surface. Combined with the `function_grapher` module defined in my library, you can create a Bézier surface.
 
-It depends on the `bezier_curve` function so remember to include bezier_curve.scad.
-
 ## Parameters
 
 - `t_step` : The distance between two points of the Bézier path.
@@ -13,9 +11,8 @@ It depends on the `bezier_curve` function so remember to include bezier_curve.sc
 
 If you have 16 control points and combine with the `function_grapher` module:
 
-	include <bezier_curve.scad>;
-	include <bezier_surface.scad>; 
-	include <function_grapher.scad>;
+	use <bezier_surface.scad>; 
+	use <function_grapher.scad>;
 
 	t_step = 0.05;
 	thickness = 0.5;

docs/lib2x-bijection_offset.md

@@ -12,7 +12,7 @@ Move 2D outlines outward or inward by a given amount. Each point of the offsette
 
 ## Examples
 
-	include <bijection_offset.scad>;
+	use <bijection_offset.scad>;
 
 	shape = [
 		[15, 0],
@@ -32,11 +32,9 @@ Move 2D outlines outward or inward by a given amount. Each point of the offsette
 
 ![bijection_offset](images/lib-bijection_offset-1.JPG)
 
-	include <bijection_offset.scad>;
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
-	include <bezier_curve.scad>;
+	use <bijection_offset.scad>;
+	use <path_extrude.scad>;
+	use <bezier_curve.scad>;
 
 	shape = [
 		[5, 0],

docs/lib2x-box_extrude.md

@@ -8,17 +8,18 @@ Creates a box (container) from a 2D object.
 - `shell_thickness` : The thickness between the exterior and interior.
 - `offset_mode` : `"delta"` (default) or `"r"`. See [offset](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#offset) for details.
 - `chamfer` : Default `false`. See [offset](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#offset) for details.
+- `twist`, `slices`, `scale`: The same as `linear_extrude`. **Since:** 2.1.
 
 ## Examples
 
-    include <box_extrude.scad>;
+    use <box_extrude.scad>;
     
 	box_extrude(height = 30, shell_thickness = 2) 
 	    circle(r = 30);
 
 ![box_extrude](images/lib-box_extrude-1.JPG)
 
-    include <box_extrude.scad>;
+    use <box_extrude.scad>;
     
 	box_extrude(height = 30, shell_thickness = 2) 
 	    text("XD", size = 40, font = "Cooper Black");

docs/lib2x-bspline_curve.md

@@ -0,0 +1,86 @@
+# bspline_curve
+
+[B-spline](https://en.wikipedia.org/wiki/B-spline) interpolation using [de Boor's algorithm](https://en.wikipedia.org/wiki/De_Boor%27s_algorithm). This function returns points of the B-spline path. Combined with the `polyline`, `polyline3d` or `hull_polyline3d` module, you can create a B-spline curve.
+
+**Since:** 2.1
+
+## Parameters
+
+- `t_step` : The increment amount along the curve in the [0, 1] range.
+- `degree` : The degree of B-spline. Must be less than or equal to `len(points) - 1`.
+- `points` : A list of `[x, y]` or `[x, y, z]` control points. 
+- `knots` : The knot vector. It's a non-decreasing sequence with length `len(points) + degree + 1`. If not provided, a uniform knot vector is generated automatically.
+- `weights` : The weights of control points. If not provided, the weight of each point is 1.
+
+## Examples
+
+    use <bspline_curve.scad>;
+    
+	points = [
+		[-10, 0],
+		[-5,  5],
+		[ 5, -5],
+		[ 10, 0]
+	];
+
+	color("red") for(p = points) {
+		translate(p) 
+			sphere(0.5);
+	}
+
+    // knots: [0, 1, 2, 3, 4, 5, 6]
+	// weights: [1, 1, 1, 1]
+	for(p = bspline_curve(0.01, 2, points)) {
+		translate(p) 
+			sphere(0.1);
+	}
+
+![bspline_curve](images/lib2-bspline_curve-1.JPG)
+
+    use <bspline_curve.scad>;
+    
+	points = [
+		[-10, 0],
+		[-5,  5],
+		[ 5, -5],
+		[ 10, 0]
+	];
+
+    // a non-uniform B-spline curve
+    knots = [0, 1/8, 1/4, 1/2, 3/4, 4/5, 1];
+    
+	color("red") for(p = points) {
+		translate(p) 
+			sphere(0.5);
+	}
+
+	for(p = bspline_curve(0.01, 2, points, knots)) {
+		translate(p) 
+			sphere(0.1);
+	}
+
+![bspline_curve](images/lib2-bspline_curve-2.JPG)
+
+	use <bspline_curve.scad>;
+		
+	points = [
+		[-10, 0],
+		[-5,  5],
+		[ 5, -5],
+		[ 10, 0]
+	];
+
+	// For a clamped B-spline curve, the first `degree + 1` and the last `degree + 1` knots must be identical.
+	knots = [0, 0, 0, 1, 2, 2, 2];
+
+	color("red") for(p = points) {
+		translate(p) 
+			sphere(0.5);
+	}
+
+	for(p = bspline_curve(0.01, 2, points, knots)) {
+		translate(p) 
+			sphere(0.1);
+	}
+
+![bspline_curve](images/lib2-bspline_curve-3.JPG)

docs/lib2x-circle_path.md

@@ -10,7 +10,7 @@ Sometimes you need all points on the path of a circle. Here's the function. Its
 
 ## Examples
 
-    include <circle_path.scad>;
+    use <circle_path.scad>;
 
 	$fn = 24;
 	

docs/lib2x-cone.md

@@ -0,0 +1,67 @@
+# cone
+
+Create a cone for rotatable models.
+
+![cone](images/lib2-cone-1.JPG)
+
+**Since:** 2.1
+
+
+## Parameters
+
+- `radius` : The radius of the cone.
+- `length` : The length of the cone.
+- `spacing` : The spacing between the cone and void component. Default to `0.5`.
+- `angle` : The angle between the bottom and hypotenuse. Default to `50` degree.
+- `void` : The void component for differencing. It's used to create a cavity for a cone. Default to `false`.
+- `ends` : Default to `false`. To create a double-ended cone, set it to `true`.
+
+## Examples
+
+	use <part/cone.scad>;
+
+	radius = 2.5;
+    length = 2;
+	spacing = 0.5;
+
+	$fn = 48;
+
+	cone(
+		radius = radius, 
+		spacing = spacing,
+        length = 2
+	);
+
+	%cone(
+		radius = radius, 
+		spacing = spacing,
+        length = 2,		
+        void = true
+	);
+
+![cone](images/lib2-cone-2.JPG)
+
+	use <part/cone.scad>;
+
+	radius = 2.5;
+    length = 2;
+	spacing = 0.5;
+
+	$fn = 48;
+
+	cone(
+		radius = radius, 
+		spacing = spacing,
+        length = 2,
+        ends = true
+	);
+
+	%cone(
+		radius = radius, 
+		spacing = spacing,
+        length = 2,		
+        void = true,
+        ends = true
+	);
+
+![cone](images/lib2-cone-3.JPG)

docs/lib2x-connector_peg.md

@@ -0,0 +1,60 @@
+# connector_peg
+
+Create a connector peg.
+
+![connector_peg](images/lib2-connector_peg-3.JPG)
+
+**Since:** 2.1
+
+
+## Parameters
+
+- `radius` : The shaft radius of the peg.
+- `height` : The height of the pag. Default to `2.5 * radius`.
+- `spacing` : The spacing between the peg and void component. Default to `0.5`.
+- `void` : The void component for differencing. It's used to create a cavity for a peg. Default to `false`.
+- `ends` : Default to `false`. To create a double-ended peg, set it to `true`.
+
+## Examples
+
+	use <part/connector_peg.scad>;
+
+	radius = 2.5;
+	spacing = 0.5;
+
+	$fn = 48;
+
+	connector_peg(
+		radius = radius, 
+		spacing = spacing
+	);
+
+	%connector_peg(
+		radius = radius, 
+		spacing = spacing,
+		void = true
+	);
+
+![connector_peg](images/lib2-connector_peg-1.JPG)
+
+	use <part/connector_peg.scad>;
+
+	radius = 2.5;
+	spacing = 0.5;
+
+	$fn = 48;
+
+	connector_peg(
+		radius = radius, 
+		spacing = spacing,
+		ends = true
+	);
+
+	%connector_peg(
+		radius = radius, 
+		spacing = spacing,
+		ends = true,
+		void = true
+	);
+
+![connector_peg](images/lib2-connector_peg-2.JPG)

docs/lib2x-cross_sections.md

@@ -2,8 +2,6 @@
 
 Given a 2D shape, points and angles along the path, this function will return all cross-sections. Combined with the `polysections` module, you can create a specific path extrusion.
 
-It depends on the `rotate_p` function. Remember to include "rotate_p.scad".
-
 ## Parameters
 
 - `shape_pts`: A list of points represent a shape. See the example below.
@@ -14,10 +12,9 @@ It depends on the `rotate_p` function. Remember to include "rotate_p.scad".
 
 ## Examples
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <cross_sections.scad>;
-	include <archimedean_spiral.scad>;
+	use <polysections.scad>;
+	use <cross_sections.scad>;
+	use <archimedean_spiral.scad>;
 
 	shape_pts = [
 		[-2, -10],

docs/lib2x-crystal_ball.md

@@ -4,46 +4,42 @@ Uses spherical coordinate system to create a crystal ball.
 
 ![Spherical coordinates (r, θ, φ) often used in mathematics](https://upload.wikimedia.org/wikipedia/commons/d/dc/3D_Spherical_2.svg)
 
-Dependencies: `rotate_p`, `cross_sections`, `polysections`, `ring_extrude`, `shape_pie`.
-
 ## Parameters
 
 - `radius` : The radial distance r. 
 - `theta` : The azimuthal angle. It defaults to 360. It also accepts a 2 element vector. The first element of the vector is the beginning angle in degrees, and the second element is the ending angle.
 - `phi` : The polar angle. It defaults to 180. It also accepts a 2 element vector. The first element of the vector is the beginning angle in degrees, and the second element is the ending angle.
+- `thickness` : The thickness of the ball. **Since:** 2.1.
 - `$fa`, `$fs`, `$fn` : 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 will be a multiple of 4 to fit edges.
 
 ## Examples
 
-	include <rotate_p.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <ring_extrude.scad>;
-	include <shape_pie.scad>;
-	include <crystal_ball.scad>;
-	
+	use <crystal_ball.scad>;
+
 	crystal_ball(radius = 6);
-	
+
 	translate([12, 0, 0]) 
-	    crystal_ball(
-	        radius = 6, 
-	        theta = 270,
-	        $fn = 12
-	    );
-	
+		crystal_ball(
+			radius = 6, 
+			theta = 270,
+			thickness = 1,
+			$fn = 12
+		);
+
 	translate([24, 0, 0]) 
-	    crystal_ball(
-	        radius = 6, 
-	        theta = 270,
-	        phi = 90,
-	        $fn = 12
-	    );    
-	    
+		crystal_ball(
+			radius = 6, 
+			theta = 270,
+			phi = 90,
+			$fn = 12
+		);    
+
 	translate([36, 0, 0]) 
-	    crystal_ball(
-	        radius = 6, 
-	        theta = [-30, 270],
-	        phi = [30, 60]
-	    );        
+		crystal_ball(
+			radius = 6, 
+			theta = [-30, 270],
+			phi = [30, 60],
+			thickness = 2
+		);           
 
 ![crystal_ball](images/lib-crystal_ball-1.JPG)

docs/lib2x-ellipse_extrude.md

@@ -10,7 +10,7 @@ Extrudes a 2D object along the path of an ellipse from 0 to 180 degrees. The sem
 
 ## Examples
 
-	include <ellipse_extrude.scad>;
+	use <ellipse_extrude.scad>;
 	
 	semi_minor_axis = 5;
 	 
@@ -19,7 +19,7 @@ Extrudes a 2D object along the path of an ellipse from 0 to 180 degrees. The sem
 
 ![ellipse_extrude](images/lib-ellipse_extrude-1.JPG)
 
-	include <ellipse_extrude.scad>;
+	use <ellipse_extrude.scad>;
 	
 	semi_minor_axis = 5;
 	 
@@ -28,7 +28,7 @@ Extrudes a 2D object along the path of an ellipse from 0 to 180 degrees. The sem
 
 ![ellipse_extrude](images/lib-ellipse_extrude-2.JPG)
 
-    include <ellipse_extrude.scad>;
+    use <ellipse_extrude.scad>;
 
 	semi_minor_axis = 5;
 	 
@@ -39,7 +39,7 @@ Extrudes a 2D object along the path of an ellipse from 0 to 180 degrees. The sem
 
 ![ellipse_extrude](images/lib-ellipse_extrude-3.JPG)
 
-	include <ellipse_extrude.scad>;
+	use <ellipse_extrude.scad>;
 	
 	semi_minor_axis = 10;
 	 

docs/lib2x-fibseq.md

@@ -0,0 +1,16 @@
+# fibseq
+
+Generate a Fibonacci sequence.
+
+**Since:**: 2.1
+
+## Parameters
+
+- `from` : The nth Fibonacci number you wanna start from.
+- `to` : The nth Fibonacci number you wanna go to.
+
+## Examples
+    
+	use <util/fibseq.scad>;
+	
+	echo(fibseq(1, 10));  // ECHO: [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

docs/lib2x-function_grapher.md

@@ -2,8 +2,6 @@
 
 Given a set of points `[x, y, f(x, y)]` where `f(x, y)` is a mathematics function, the `function_grapher` module can create the graph of `f(x, y)`.
 
-It depends on the `line3d`, `polyline3d`, `hull_polyline3d` modules so you have to include "line3d.scad", "polyline3d.scad" and "hull_polyline3d.scad".
-
 ## Parameters
 
 - `points` : A set of points `[x, y, f(x, y)]`. See examples below.
@@ -14,10 +12,7 @@ It depends on the `line3d`, `polyline3d`, `hull_polyline3d` modules so you have
 
 ## Examples
 
-	include <line3d.scad>;
-	include <polyline3d.scad>;
-	include <hull_polyline3d.scad>;
-	include <function_grapher.scad>;
+	use <function_grapher.scad>;
 	
 	points = [
 	    [[0, 0, 1], [1, 0, 2], [2, 0, 2], [3, 0, 3]],
@@ -32,10 +27,7 @@ It depends on the `line3d`, `polyline3d`, `hull_polyline3d` modules so you have
 
 ![function_grapher](images/lib-function_grapher-1.JPG)
 
-	include <line3d.scad>;
-	include <polyline3d.scad>;
-	include <hull_polyline3d.scad>;
-	include <function_grapher.scad>;
+	use <function_grapher.scad>;
 	
 	function f(x, y) = 
 	   30 * (
@@ -60,10 +52,7 @@ It depends on the `line3d`, `polyline3d`, `hull_polyline3d` modules so you have
 
 ![function_grapher](images/lib-function_grapher-2.JPG)
 
-	include <line3d.scad>;
-	include <polyline3d.scad>;
-	include <hull_polyline3d.scad>;
-	include <function_grapher.scad>;
+	use <function_grapher.scad>;
 
 	function f(x, y) = 
 	   30 * (
@@ -89,10 +78,7 @@ It depends on the `line3d`, `polyline3d`, `hull_polyline3d` modules so you have
 
 ![function_grapher](images/lib-function_grapher-3.JPG)
 
-	include <line3d.scad>;
-	include <polyline3d.scad>;
-	include <hull_polyline3d.scad>;
-	include <function_grapher.scad>;
+	use <function_grapher.scad>;
 
 	function f(x, y) = 
 	   30 * (

docs/lib2x-golden_spiral.md

@@ -4,8 +4,6 @@ Gets all points and angles on the path of a golden spiral based on Fibonacci num
 
 It returns a vector of `[[x, y], angle]`. 
 
-Because of depending on `circle_path` and `rotate_p`, remember to include "circle_path.scad" and "rotate_p.scad".
-
 ## Parameters
 
 - `from` : The nth Fibonacci number you wanna start from.
@@ -15,9 +13,7 @@ Because of depending on `circle_path` and `rotate_p`, remember to include "circl
 
 ## Examples
     
-	include <circle_path.scad>;
-	include <rotate_p.scad>;
-	include <golden_spiral.scad>;
+	use <golden_spiral.scad>;
 	        
 	pts_angles = golden_spiral(
 	    from = 3, 
@@ -32,9 +28,7 @@ Because of depending on `circle_path` and `rotate_p`, remember to include "circl
 
 ![golden_spiral](images/lib-golden_spiral-1.JPG)
 	
-	include <circle_path.scad>;
-	include <rotate_p.scad>;
-	include <golden_spiral.scad>;
+	use <golden_spiral.scad>;
 	        
 	pts_angles = golden_spiral(
 	    from = 5, 

docs/lib2x-golden_spiral_extrude.md

@@ -2,9 +2,7 @@
 
 Extrudes a 2D shape along the path of a golden spiral. 
 
-When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
-
-Dependencies: `circle_path`, `rotate_p`, `golden_spiral`, `cross_sections`, `polysections`.
+When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 ## Parameters
 
@@ -15,16 +13,11 @@ Dependencies: `circle_path`, `rotate_p`, `golden_spiral`, `cross_sections`, `pol
 - `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
 - `twist` : The number of degrees of through which the shape is extruded.
 - `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/lib-polysections.html) for details.
+- `triangles` : `"SOLID"` (default), `"HOLLOW"` or user-defined indexes. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 ## Examples
     
-	include <circle_path.scad>;
-	include <rotate_p.scad>;
-	include <golden_spiral.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <golden_spiral_extrude.scad>;
+	use <golden_spiral_extrude.scad>;
 
 	shape_pts = [
 		[2, -10],
@@ -45,12 +38,8 @@ Dependencies: `circle_path`, `rotate_p`, `golden_spiral`, `cross_sections`, `pol
 
 ![golden_spiral_extrude](images/lib-golden_spiral_extrude-1.JPG)
 
-    include <circle_path.scad>;
-	include <rotate_p.scad>;
-	include <golden_spiral.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <golden_spiral_extrude.scad>;
+    use <circle_path.scad>;
+	use <golden_spiral_extrude.scad>;
 
 	$fn = 12;
 

docs/lib2x-helix.md

@@ -13,8 +13,8 @@ Gets all points on the path of a spiral around a cylinder. Its `$fa`, `$fs` and
 
 ## Examples
     
-	include <helix.scad>;
-	include <hull_polyline3d.scad>;
+	use <helix.scad>;
+	use <hull_polyline3d.scad>;
 	
 	$fn = 12;
 	
@@ -34,8 +34,8 @@ Gets all points on the path of a spiral around a cylinder. Its `$fa`, `$fs` and
 
 ![helix](images/lib-helix-1.JPG)
 
-	include <helix.scad>;
-	include <hull_polyline3d.scad>;
+	use <helix.scad>;
+	use <hull_polyline3d.scad>;
 
 	$fn = 12;
 

docs/lib2x-helix_extrude.md

@@ -2,12 +2,10 @@
 
 Extrudes a 2D shape along a helix path. 
 
-When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
+When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 Its `$fa`, `$fs` and `$fn` parameters are consistent with the `cylinder` module. 
 
-Dependencies: `helix`, `rotate_p`, `cross_sections`, `polysections`.
-
 ## Parameters
 
 - `shape_pts` : A list of points represent a shape. See the example below.
@@ -18,16 +16,12 @@ Dependencies: `helix`, `rotate_p`, `cross_sections`, `polysections`.
 - `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
 - `twist` : The number of degrees of through which the shape is extruded.
 - `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/lib-polysections.html) for details.
+- `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 cylinder module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#cylinder) for more details.
 
 ## Examples
     
-	include <helix.scad>;
-	include <rotate_p.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <helix_extrude.scad>;
+	use <helix_extrude.scad>;
 
 	shape_pts = [
 		[5, -2],
@@ -49,11 +43,7 @@ Dependencies: `helix`, `rotate_p`, `cross_sections`, `polysections`.
 
 ![helix_extrude](images/lib-helix_extrude-1.JPG)
 
-	include <helix.scad>;
-	include <rotate_p.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <helix_extrude.scad>;
+	use <helix_extrude.scad>;
 
 	r1 = 40;
 	r2 = 20;

docs/lib2x-hexagons.md

@@ -10,7 +10,7 @@ A hexagonal structure is useful in many situations. This module creates hexagons
 
 ## Examples
 
-	include <hexagons.scad>;
+	use <hexagons.scad>;
 	
 	radius = 20;
 	spacing = 2;
@@ -20,7 +20,7 @@ A hexagonal structure is useful in many situations. This module creates hexagons
 
 ![hexagons](images/lib-hexagons-1.JPG)
 
-	include <hexagons.scad>;
+	use <hexagons.scad>;
 	
 	radius = 20;
 	spacing = 2;

docs/lib2x-hollow_out.md

@@ -8,7 +8,7 @@ Hollows out a 2D object.
 
 ## Examples
 
-    include <hollow_out.scad>;
+    use <hollow_out.scad>;
 
 	hollow_out(shell_thickness = 1) circle(r = 3, $fn = 48);
     hollow_out(shell_thickness = 1) square([10, 5]);

docs/lib2x-hull_polyline2d.md

@@ -10,7 +10,7 @@ Creates a 2D polyline from a list of `[x, y]` coordinates. As the name says, it
 
 ## Examples
 
-	include <hull_polyline2d.scad>;
+	use <hull_polyline2d.scad>;
 	
 	$fn = 4;
 	

docs/lib2x-hull_polyline3d.md

@@ -10,7 +10,7 @@ Creates a 3D polyline from a list of `[x, y, z]` coordinates. As the name says,
 
 ## Examples
 
-    include <hull_polyline3d.scad>;
+    use <hull_polyline3d.scad>;
 
 	hull_polyline3d(
 	    points = [
@@ -25,7 +25,7 @@ Creates a 3D polyline from a list of `[x, y, z]` coordinates. As the name says,
 
 ![polyline3d](images/lib-hull_polyline3d-1.JPG)
 
-    include <hull_polyline3d.scad>;
+    use <hull_polyline3d.scad>;
     
 	r = 50;
 	points = [

docs/lib2x-in_polyline.md

@@ -12,7 +12,7 @@ Checks wether a point is on a line.
 
 ## Examples
 
-    include <in_polyline.scad>;
+    use <in_polyline.scad>;
 
     pts = [
         [0, 0],
@@ -27,7 +27,7 @@ Checks wether a point is on a line.
 
 ----
 
-    include <in_polyline.scad>;
+    use <in_polyline.scad>;
 
     pts = [
         [10, 0, 10],

docs/lib2x-in_shape.md

@@ -13,8 +13,8 @@ Checks wether a point is inside a shape.
 
 ## Examples
 
-    include <shape_taiwan.scad>;
-    include <in_shape.scad>;
+    use <shape_taiwan.scad>;
+    use <in_shape.scad>;
 
     points = shape_taiwan(30);
 

docs/lib2x-joint_T.md

@@ -0,0 +1,32 @@
+# joint_T
+
+Create a joint_T for rotatable models.
+
+![joint_T](images/lib2-joint_T-1.JPG)
+
+**Since:** 2.1
+
+## Parameters
+
+- `shaft_r` : The shaft radius of the joint_T.
+- `shaft_h` : The height of the shaft.
+- `t_leng` : The length of the T part.
+- `thickness` : The thicnkess of the ring.
+- `spacing` : The spacing between the shaft and the ring. Default to `0.5`.
+- `center` : `false` (default) for z ranges from 0 to `shaft_h`. `true` for z ranges from `-shaft_h / 2` to `shaft_h / 2`.
+
+## Examples
+
+	use <part/joint_T.scad>;
+
+	$fn = 48;
+
+	joint_T(
+		shaft_r = 2,
+		shaft_h = 15,
+		t_leng = 15,
+		thickness = 2,
+		spacing = 0.5
+	);
+
+![joint_T](images/lib2-joint_T-2.JPG)

docs/lib2x-line2d.md

@@ -13,7 +13,7 @@ Creates a line from two points. When the end points are `CAP_ROUND`, you can use
 
 ## Examples
 
-    include <line2d.scad>;
+    use <line2d.scad>;
     
     $fn = 24;
 

docs/lib2x-line3d.md

@@ -13,7 +13,7 @@ Creates a 3D line from two points.
 
 ## Examples
 
-    include <line3d.scad>;
+    use <line3d.scad>;
     
 	line3d(
 	    p1 = [0, 0, 0], 
@@ -24,7 +24,7 @@ Creates a 3D line from two points.
 
 ![line3d](images/lib-line3d-1.JPG)
 
-    include <line3d.scad>;
+    use <line3d.scad>;
 	
 	line3d(
 	    p1 = [0, 0, 0], 
@@ -37,7 +37,7 @@ Creates a 3D line from two points.
 
 ![line3d](images/lib-line3d-2.JPG)
 			   
-    include <line3d.scad>;
+    use <line3d.scad>;
     
     line3d(
         p1 = [0, 0, 0], 

docs/lib2x-m_cumulate.md

@@ -6,14 +6,16 @@ The power of using transformation matrice is that you can cumulate all transform
 
 ## Parameters
 
+The dir changed since 2.0. 
+
 - `matrice` : A list of 4x4 transformation matrice.
 
 ## Examples
 
-	include <m_rotation.scad>;
-	include <m_scaling.scad>;
-	include <m_translation.scad>;
-	include <m_cumulate.scad>
+	use <matrix/m_rotation.scad>;
+	use <matrix/m_scaling.scad>;
+	use <matrix/m_translation.scad>;
+	use <matrix/m_cumulate.scad>
 
 	m = m_cumulate([
 		m_translation([10, 20, 10]), m_scaling(2), m_rotation(60)]

docs/lib2x-m_mirror.md

@@ -0,0 +1,25 @@
+# m_mirror
+
+The dir changed since 2.0. 
+
+Generate a 4x4 transformation matrix which can pass into `multmatrix` to mirror the child element on a plane through the origin. 
+
+**Since:** 1.1
+
+## Parameters
+
+- `v` : The normal vector of a plane intersecting the origin through which to mirror the object.
+
+## Examples
+
+	use <matrix/m_mirror.scad>;
+
+	rotate([0, 0, 10]) 
+		cube([3, 2, 1]);
+		
+	multmatrix(m_mirror([1, 1, 0]))
+		rotate([0, 0, 10]) 
+			cube([3, 2, 1]);
+
+![m_mirror](images/lib-m_mirror-1.JPG)
+

docs/lib2x-m_rotation.md

@@ -1,5 +1,7 @@
 # m_rotation
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to rotate the child element about the axis of the coordinate system or around an arbitrary axis. 
 
 **Since:** 1.1
@@ -11,7 +13,7 @@ Generate a 4x4 transformation matrix which can pass into `multmatrix` to rotate
 
 ## Examples
 
-	include <m_rotation.scad>;
+	use <matrix/m_rotation.scad>;
 
 	point = [20, 0, 0];
 	a = [0, -45, 45];
@@ -25,7 +27,7 @@ Generate a 4x4 transformation matrix which can pass into `multmatrix` to rotate
 
 ![m_rotation](images/lib-m_rotation-1.JPG)
 
-	include <m_rotation.scad>;
+	use <matrix/m_rotation.scad>;
 
 	v = [10, 10, 10];
 

docs/lib2x-m_scaling.md

@@ -1,5 +1,7 @@
 # m_scaling
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to scale its child elements using the specified vector.
 
 **Since:** 1.1
@@ -10,7 +12,7 @@ Generate a 4x4 transformation matrix which can pass into `multmatrix` to scale i
 
 ## Examples
 
-	include <m_scaling.scad>;
+	use <matrix/m_scaling.scad>;
 
 	cube(10);
 	translate([15, 0, 0]) 

docs/lib2x-m_shearing.md

@@ -1,5 +1,7 @@
 # m_shearing
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to shear all child elements along the X-axis, Y-axis, or Z-axis in 3D.
 
 **Since:** 1.1
@@ -12,7 +14,7 @@ Generate a 4x4 transformation matrix which can pass into `multmatrix` to shear a
 
 ## Examples
 
-	include <m_shearing.scad>;
+	use <matrix/m_shearing.scad>;
 
 	color("red") {
 		multmatrix(m_shearing(sx = [1, 0]))

docs/lib2x-m_translation.md

@@ -1,5 +1,7 @@
 # m_translation
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to translates (moves) its child elements along the specified vector.
 
 **Since:** 1.1
@@ -10,11 +12,11 @@ Generate a 4x4 transformation matrix which can pass into `multmatrix` to transla
 
 ## Examples
 
-	include <m_translation.scad>;
+	use <matrix/m_translation.scad>;
 
 	cube(2, center = true); 
 	multmatrix(m_translation([5, 0, 0]))
-	    sphere(1,center = true);
+	    sphere(1);
 
 ![m_translation](images/lib-m_translation-1.JPG)
 

docs/lib2x-midpt_smooth.md

@@ -12,10 +12,9 @@ Given a 2D path, this function constructs a mid-point smoothed version by joinin
 
 ## Examples
 
-    include <hull_polyline2d.scad>;
-    include <shape_taiwan.scad>;
-    include <bijection_offset.scad>;
-    include <midpt_smooth.scad>;
+    use <hull_polyline2d.scad>;
+    use <shape_taiwan.scad>;
+    use <midpt_smooth.scad>;
 
     taiwan = shape_taiwan(50);  
     smoothed = midpt_smooth(taiwan, 20, true);

docs/lib2x-multi_line_text.md

@@ -9,7 +9,7 @@ Creates multi-line text from a list of strings. Parameters are the same as the b
 
 ## Examples
     
-	include <multi_line_text.scad>;
+	use <multi_line_text.scad>;
 
 	multi_line_text(
 		["Welcome", "to", "Taiwan"],

docs/lib2x-parse_number.md

@@ -0,0 +1,16 @@
+# parse_number
+
+The dir changed since 2.0. 
+
+Parses the string argument as an number. 
+
+## Parameters
+
+- `t` : A string containing the number representation to be parsed.
+
+## Examples
+
+    use <util/parse_number.scad>;
+    
+	echo(parse_number("10") + 1);    // ECHO: 11
+	echo(parse_number("-1.1") + 1);  // ECHO: -0.1

docs/lib2x-path_extrude.md

@@ -2,9 +2,7 @@
 
 It extrudes a 2D shape along a path. This module is suitable for a path created by a continuous function.
 
-It depends on the `rotate_p` function and the `polysections` module. Remember to include "rotate_p.scad" and "polysections.scad".
-
-When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib-polysections.html) for details.
+When using this module, you should use points to represent the 2D shape. If your 2D shape is not solid, indexes of triangles are required. See [polysections](https://openhome.cc/eGossip/OpenSCAD/lib2x-polysections.html) for details.
 
 ## Parameters
 
@@ -18,10 +16,8 @@ When using this module, you should use points to represent the 2D shape. If your
 
 ## Examples
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
-	include <bezier_curve.scad>;
+	use <path_extrude.scad>;
+	use <bezier_curve.scad>;
 
 	t_step = 0.05;
 	width = 2;
@@ -47,10 +43,8 @@ When using this module, you should use points to represent the 2D shape. If your
 
 ![path_extrude](images/lib-path_extrude-1.JPG)
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
-	include <bezier_curve.scad>;
+	use <path_extrude.scad>;
+	use <bezier_curve.scad>;
 
 	t_step = 0.05;
 
@@ -81,10 +75,8 @@ When using this module, you should use points to represent the 2D shape. If your
 
 ![path_extrude](images/lib-path_extrude-2.JPG)
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
-	include <bezier_curve.scad>;
+	use <path_extrude.scad>;
+	use <bezier_curve.scad>;
 	
 	t_step = 0.05;
 	
@@ -130,11 +122,7 @@ When using this module, you should use points to represent the 2D shape. If your
 
 If you want to extrude a shape along a path precisely, providing enough information about how to rotate sections is necessary. If you want to extrude a shape along a helix, `helix_extrude` is more suitable because it knows how to dig out necessary data for rotating sections precisely.
 
-	include <helix.scad>;
-	include <rotate_p.scad>;
-	include <cross_sections.scad>;
-	include <polysections.scad>;
-	include <helix_extrude.scad>;
+	use <helix_extrude.scad>;
 
 	shape_pts = [
 		[0,0],
@@ -153,11 +141,8 @@ If you want to extrude a shape along a path precisely, providing enough informat
 
 If you have only points, what `path_extrude` can do is to **guess** data about rotations. The different algorithm will dig out different data. For example:
 
-	include <helix.scad>;
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <helix.scad>;
-	include <path_extrude.scad>;
+	use <helix.scad>;
+	use <path_extrude.scad>;
 
 	shape_pts = [
 		[0,0],
@@ -180,10 +165,8 @@ You might think this is wrong. Actually, it's not. It's the correct/default beha
 
  The `method` parameter is default to `"AXIS_ANGLE"`, a way to guess information from points. It accepts `"EULER_ANGLE"`, too. 
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <helix.scad>;
-	include <path_extrude.scad>;
+	use <helix.scad>;
+	use <path_extrude.scad>;
 
 	shape_pts = [
 		[0,0],
@@ -206,9 +189,7 @@ You might think this is wrong. Actually, it's not. It's the correct/default beha
 
 `"EULER_ANGLE"` will generate an abrupt when the path is exactly vertical. [The problem happened in (older) Blender, too.](https://download.blender.org/documentation/htmlI/ch09s04.html) 
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
+	use <path_extrude.scad>;
 
 	shape_pts = [[5, -5], [5, 5], [-5, 5], [-5, -5]];
 
@@ -232,9 +213,7 @@ You might think this is wrong. Actually, it's not. It's the correct/default beha
 
 The problem doesn't happen when `method` is `"AXIS_ANGLE"`.
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
+	use <path_extrude.scad>;
 
 	shape_pts = [[5, -5], [5, 5], [-5, 5], [-5, -5]];
 
@@ -262,11 +241,9 @@ So, which is the correct method? Both methods are correct when you provide only
 
 `"EULER_ANGLE"`, however, generates the same section at the same point. This means that you don't have to adjust sections if you want to extrude along a closed path. It's an advantage when extruding. For example:
 
-	include <shape_pentagram.scad>;
-	include <rotate_p.scad>;
-	include <polysections.scad>;
-	include <path_extrude.scad>;
-	include <torus_knot.scad>;
+	use <shape_pentagram.scad>;
+	use <path_extrude.scad>;
+	use <torus_knot.scad>;
 
 	p = 2;
 	q = 3;

docs/lib2x-path_scaling_sections.md

@@ -15,11 +15,10 @@ You can use any point as the first point of the edge path. Just remember that yo
 
 ## Examples
 
-	include <hull_polyline3d.scad>;
-	include <shape_taiwan.scad>;
-	include <path_scaling_sections.scad>;
-	include <m_scaling.scad>;
-	include <polysections.scad>;
+	use <hull_polyline3d.scad>;
+	use <shape_taiwan.scad>;
+	use <path_scaling_sections.scad>;
+	use <polysections.scad>;
 
 	taiwan = shape_taiwan(100);
 	fst_pt = [13, 0, 0];
@@ -39,12 +38,11 @@ You can use any point as the first point of the edge path. Just remember that yo
 
 ![path_scaling_sections](images/lib-path_scaling_sections-1.JPG)
 
-	include <hull_polyline3d.scad>;
-	include <shape_taiwan.scad>;
-	include <path_scaling_sections.scad>;
-	include <m_scaling.scad>;
-	include <polysections.scad>;
-	include <bezier_curve.scad>;
+	use <hull_polyline3d.scad>;
+	use <shape_taiwan.scad>;
+	use <path_scaling_sections.scad>;
+	use <polysections.scad>;
+	use <bezier_curve.scad>;
 
 
 	taiwan = shape_taiwan(100);
@@ -65,12 +63,11 @@ You can use any point as the first point of the edge path. Just remember that yo
 
 ![path_scaling_sections](images/lib-path_scaling_sections-2.JPG)
 
-	include <shape_taiwan.scad>;
-	include <path_scaling_sections.scad>;
-	include <m_scaling.scad>;
-	include <polysections.scad>;
-	include <bezier_curve.scad>;
-	include <rotate_p.scad>;
+	use <shape_taiwan.scad>;
+	use <path_scaling_sections.scad>;
+	use <polysections.scad>;
+	use <bezier_curve.scad>;
+	use <rotate_p.scad>;
 
 	taiwan = shape_taiwan(100);
 	fst_pt = [13, 0, 0];
@@ -102,12 +99,11 @@ You can use any point as the first point of the edge path. Just remember that yo
 
 ![path_scaling_sections](images/lib-path_scaling_sections-3.JPG)	
 
-	include <hull_polyline3d.scad>;
-	include <shape_taiwan.scad>;
-	include <path_scaling_sections.scad>;
-	include <m_scaling.scad>;
-	include <polysections.scad>;
-    include <rotate_p.scad>;
+	use <hull_polyline3d.scad>;
+	use <shape_taiwan.scad>;
+	use <path_scaling_sections.scad>;
+	use <polysections.scad>;
+    use <rotate_p.scad>;
 
 	taiwan = shape_taiwan(100);
 

docs/lib2x-paths2sections.md

@@ -10,9 +10,9 @@ You paths should be indexed count-clockwisely.
 
 ## Examples
 
-	include <paths2sections.scad>;
-	include <hull_polyline3d.scad>;
-	include <polysections.scad>;
+	use <paths2sections.scad>;
+	use <hull_polyline3d.scad>;
+	use <polysections.scad>;
 	
 	paths = [
 	    [[5, 0, 5], [15, 10, 10], [25, 20, 5]],
@@ -31,10 +31,10 @@ You paths should be indexed count-clockwisely.
 
 ![paths2sections](images/lib-paths2sections-1.JPG)
 
-	include <bezier_curve.scad>;
-	include <paths2sections.scad>;
-	include <hull_polyline3d.scad>;
-	include <polysections.scad>;
+	use <bezier_curve.scad>;
+	use <paths2sections.scad>;
+	use <hull_polyline3d.scad>;
+	use <polysections.scad>;
 	
 	t_step = 0.05;
 	

docs/lib2x-pie.md

@@ -10,7 +10,7 @@ Creates a pie (circular sector). You can pass a 2 element vector to define the c
 
 ## Examples
 
-    include <pie.scad>;
+    use <pie.scad>;
 
     pie(radius = 20, angle = [210, 310]);   
     translate([-15, 0, 0]) pie(radius = 20, angle = [45, 135]);  

docs/lib2x-polyline2d.md

@@ -1,6 +1,6 @@
 # polyline2d
 
-Creates a polyline from a list of `x`, `y` coordinates. When the end points are `CAP_ROUND`, you can use `$fa`, `$fs` or `$fn` to controll the circle module used internally. It depends on the `line2d` module so you have to `include` line2d.scad.
+Creates a polyline from a list of `x`, `y` coordinates. When the end points are `CAP_ROUND`, you can use `$fa`, `$fs` or `$fn` to controll the circle module used internally.
 
 ## Parameters
 
@@ -12,16 +12,14 @@ Creates a polyline from a list of `x`, `y` coordinates. When the end points are
 
 ## Examples
 
-    include <line2d.scad>;
-    include <polyline2d.scad>;
+    use <polyline2d.scad>;
 
     $fn = 24;
 	polyline2d(points = [[1, 2], [-5, -4], [-5, 3], [5, 5]], width = 1);
 
 ![polyline2d](images/lib-polyline2d-1.JPG)
 
-    include <line2d.scad>;
-    include <polyline2d.scad>;
+    use <polyline2d.scad>;
     
     $fn = 24;
     polyline2d(points = [[1, 2], [-5, -4], [-5, 3], [5, 5]], width = 1,
@@ -29,8 +27,7 @@ Creates a polyline from a list of `x`, `y` coordinates. When the end points are
 
 ![polyline2d](images/lib-polyline2d-2.JPG)
 
-    include <line2d.scad>;
-    include <polyline2d.scad>;
+    use <polyline2d.scad>;
     
     $fn = 24;
 	polyline2d(points = [[1, 2], [-5, -4], [-5, 3], [5, 5]], width = 1,

docs/lib2x-polyline3d.md

@@ -1,6 +1,6 @@
 # polyline3d
 
-Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `line3d` module so you have to `include` line3d.scad.
+Creates a polyline from a list of `[x, y, z]` coordinates. 
 
 ## Parameters
 
@@ -12,8 +12,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `li
 
 ## Examples
 
-    include <line3d.scad>;
-    include <polyline3d.scad>;
+    use <polyline3d.scad>;
 
 	polyline3d(
 	    points = [
@@ -28,8 +27,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `li
 
 ![polyline3d](images/lib-polyline3d-1.JPG)
 
-    include <line3d.scad>;
-    include <polyline3d.scad>;
+    use <polyline3d.scad>;
 
 	polyline3d(
 	    points = [
@@ -45,8 +43,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `li
 
 ![polyline3d](images/lib-polyline3d-2.JPG)
 
-    include <line3d.scad>;
-    include <polyline3d.scad>;
+    use <polyline3d.scad>;
 
 	polyline3d(
 	    points = [
@@ -63,8 +60,7 @@ Creates a polyline from a list of `[x, y, z]` coordinates. It depends on the `li
 
 ![polyline3d](images/lib-polyline3d-3.JPG)
 
-    include <line3d.scad>;
-    include <polyline3d.scad>;
+    use <polyline3d.scad>;
     
 	r = 20;
 	h = 5;

docs/lib2x-polysections.md

@@ -44,8 +44,8 @@ When defining triangles, you can use clockwise or counter-clockwise indexes.
 
 ## Examples
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
+	use <rotate_p.scad>;
+	use <polysections.scad>;
 
 	section1 = [
 		[20, 0, 0],
@@ -68,8 +68,8 @@ When defining triangles, you can use clockwise or counter-clockwise indexes.
 
 ![polysections](images/lib-polysections-7.JPG)
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
+	use <rotate_p.scad>;
+	use <polysections.scad>;
 	
 	section1 = [
 	    // outer
@@ -98,8 +98,8 @@ When defining triangles, you can use clockwise or counter-clockwise indexes.
 
 ![polysections](images/lib-polysections-8.JPG)
 
-	include <rotate_p.scad>;
-	include <polysections.scad>;
+	use <rotate_p.scad>;
+	use <polysections.scad>;
 	
 	section1 = [
 	    // outer

docs/lib2x-polytransversals.md

@@ -18,9 +18,9 @@ You can view it as a better polyline2d module. If you have only the points of a
 
 ## Examples
 
-	include <rotate_p.scad>;
-	include <polytransversals.scad>;
-	include <hull_polyline2d.scad>;
+	use <rotate_p.scad>;
+	use <polytransversals.scad>;
+	use <hull_polyline2d.scad>;
 	
 	r = 35;    
 	tran_pts = [[-5, 0], [0, 5], [5, 0]];

docs/lib2x-px_ascii.md

@@ -0,0 +1,40 @@
+# px_ascii
+
+Generate 8x8 pixel points of printable ASCII characters (codes 32dec to 126dec). You can use these points to build pixel-style models. 
+
+**Since:** 2.1
+
+## Parameters
+
+- `char` : A printable ASCII character.
+- `center`: . If `true`, object is centered in X- and Y-axis. Otherwise, the object is placed in the positive quadrant. Defaults to `false`.
+- `invert`: Inverts points of the character. Default to `false`. 
+
+## Examples
+
+    use <pixel/px_ascii.scad>;
+
+    for(i = [0:94]) {
+        translate([8 * (i % 10), -8 * floor(i / 10), 0]) 
+            for(p = px_ascii(chr(i + 32))) {
+                translate(p) 
+                    linear_extrude(1, scale = 0.8) 
+                        square(1);
+            }
+    }       
+
+![px_ascii](images/lib2-px_ascii-1.JPG)
+
+    use <pixel/px_ascii.scad>;
+
+    t = "dotSCAD";
+     
+    for(i = [0:len(t) - 1]) {
+        translate([i * 8, 0]) 
+            for(pt = px_ascii(t[i], invert = true)) {
+                translate(pt)
+                    sphere(0.5, $fn = 24);
+            }
+    }
+
+![px_ascii](images/lib2-px_ascii-2.JPG)

docs/lib2x-px_circle.md

@@ -0,0 +1,32 @@
+# px_circle
+
+Returns points that can be used to draw a pixel-style circle.
+
+**Since:** 2.0
+
+## Parameters
+
+- `radius` : The circle radius. The value must be an integer.
+- `filled` : Default to `false`. Set it `true` if you want a filled circle.
+
+## Examples
+
+	use <pixel/px_circle.scad>;
+
+	for(pt = px_circle(10)) {
+		translate(pt)
+			square(1, center = true);
+	}
+
+![px_circle](images/lib2-px_circle-1.JPG)
+
+	use <pixel/px_circle.scad>;
+
+	for(pt = px_circle(10, filled = true)) {
+		translate(pt)
+			linear_extrude(1, scale = 0.5) 
+				square(1, center = true);
+	}
+		
+![px_circle](images/lib2-px_circle-2.JPG)
+

docs/lib2x-px_cylinder.md

@@ -0,0 +1,33 @@
+# px_cylinder
+
+Returns points that can be used to draw a pixel-style cylinder.
+
+**Since:** 2.0
+
+## Parameters
+
+- `radius` : The radius of the cylinder. It also accepts a vector `[r1, r2]`. `r1` is the bottom radius and `r2` is the top radius of a cone. Values must be an integer.
+- `h` : The height of the cylinder or cone. 
+- `filled` : Default to `false`. Set it `true` if you want a filled cylinder.
+- `thickness`: Default to 1. The thickness when `filled` is `false`. The value must be an integer.
+
+## Examples
+
+	use <pixel/px_cylinder.scad>;
+
+	for(pt = px_cylinder([10, 15], 10)) {
+		translate(pt)
+			cube(1, center = true);
+	}
+
+![px_cylinder](images/lib2-px_cylinder-1.JPG)
+
+	use <pixel/px_cylinder.scad>;
+
+	for(pt = px_cylinder([20, 15], h = 10, thickness = 3)) {
+		translate(pt)
+			cube(1, center = true);
+	}
+	
+![px_cylinder](images/lib2-px_cylinder-2.JPG)
+

docs/lib2x-px_from.md

@@ -0,0 +1,108 @@
+# px_from
+
+Given a list of 0s and 1s that represent a black-and-white image. This function translates them into pixel points. You can use these points to build pixel-style models.
+
+**Since:** 2.1
+
+## Parameters
+
+- `binaries` : A list of 0s and 1s.
+- `center`: . If `true`, object is centered in X- and Y-axis. Otherwise, the object is placed in the positive quadrant. Defaults to `false`.
+- `invert`: Inverts how binaries are translated into points. Default to `false`. 1s are translated into points. Otherwise, 0s are translated into points.
+
+## Examples
+
+    use <pixel/px_from.scad>;
+
+    pts = px_from([
+        [0,0,0,0,0,0,0,0],
+        [0,0,0,1,1,0,0,0],
+        [0,0,1,1,1,1,0,0],
+        [0,1,1,0,0,1,1,0],
+        [0,1,1,0,0,1,1,0],
+        [0,1,1,1,1,1,1,0],
+        [0,1,1,0,0,1,1,0],
+        [0,0,0,0,0,0,0,0]
+    ]);
+                
+    for(pt = pts) {
+        translate(pt) square(1);
+    }
+
+    translate([8, 0]) for(pt = pts) {
+        translate(pt) text("A", font="Arial Black", 1);
+    }
+
+![px_from](images/lib2-px_from-1.JPG)
+
+I provide a tool [img2binary](https://github.com/JustinSDK/img2binary) for converting an image into 0 and 1. A black and white picture is suggested. 0 is for black and 1 is for white. Given an image like this:
+
+![px_from](images/lib2-px_from-2.JPG)
+
+The tool converts it into binaries. Combined with the `pixel_from`, you can build a model like this:
+
+    use <pixel/px_from.scad>;
+
+    pts = px_from([
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1],
+        [1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1],
+        [1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1],
+        [1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1],
+        [1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1],
+        [1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1],
+        [1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1],
+        [1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1],
+        [1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
+    ], invert = true);
+                
+    for(pt = pts) {
+        translate(pt) sphere(.5, $fn = 24);
+    }
+
+![px_from](images/lib2-px_from-3.JPG)

docs/lib2x-px_gray.md

@@ -0,0 +1,187 @@
+# px_gray
+
+Given a list of numbers (0 ~ 255) that represent a gray image. This function translates them into a list of `[x, y, level]`s.
+
+**Since:** 2.1
+
+## Parameters
+
+- `levels` : A list of numbers (0 ~ 255).
+- `center`: . If `true`, object is centered in X- and Y-axis. Otherwise, the object is placed in the positive quadrant. Defaults to `false`.
+- `invert`: Inverts the `level` value of the returned `[x, y, value]`. Default to `false`. 
+- `normalize`: Normalize the `level` value of the returned `[x, y, value]`. Default to `false`. If it's `true`, the `level` value ranges from 0 to 1.
+ 
+## Examples
+
+    use <pixel/px_gray.scad>;
+
+    levels = [
+        [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255],
+        [255, 255, 0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255],
+        [255, 255, 0, 0, 170, 170, 170, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255],
+        [255, 255, 0, 0, 170, 170, 170, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255],
+        [0, 0, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [0, 0, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [0, 0, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [0, 0, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 85, 85, 0, 0],
+        [0, 0, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 85, 85, 0, 0],
+        [0, 0, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0],
+        [0, 0, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0],
+        [0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0],
+        [0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0],
+        [0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0],
+        [0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 85, 85, 0, 0],
+        [0, 0, 170, 170, 170, 170, 170, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 85, 170, 170, 170, 170, 170, 85, 85, 0, 0],
+        [0, 0, 170, 170, 85, 85, 85, 85, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [0, 0, 170, 170, 85, 85, 85, 85, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [0, 0, 170, 170, 85, 85, 85, 85, 85, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 85, 85, 85, 85, 85, 85, 85, 0, 0],
+        [255, 255, 0, 0, 0, 0, 0, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 0, 0, 0, 0, 0, 255, 255],
+        [255, 255, 0, 0, 0, 0, 0, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 0, 0, 0, 0, 0, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 0, 0, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 0, 0, 0, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 0, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 0, 0, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 0, 0, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 0, 0, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255],
+        [255, 255, 255, 255, 255, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255]
+    ];
+
+    dots = px_gray(levels, center = true);
+    for(dot = dots) {
+        g = 1 - dot[1] / 255;
+        h = dot[1] / 85;
+        color([g, g, g]) 
+            translate(dot[0]) 
+                linear_extrude(h) 
+                    square(1);
+    }
+
+![px_gray](images/lib2-px_gray-1.JPG)
+
+I provide a tool [img2gray](https://github.com/JustinSDK/img2gray) for converting an image into data required by this function. Given an image like this:
+
+![px_gray](images/caterpillar.JPG)
+
+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>;
+
+    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], 
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+        [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);
+    for(dot = dots) {
+        translate(dot[0]) 
+            square(dot[1]);
+    }
+
+![px_gray](images/lib2-px_gray-2.JPG)

docs/lib2x-px_line.md

@@ -0,0 +1,31 @@
+# px_line
+
+Given two points. `px_line` returns points that can be used to draw a pixel-style line.
+
+**Since:** 2.0
+
+## Parameters
+
+- `p1` : The start point `[x, y]` or `[x, y, z]`. x, y, z must be integer.
+- `p2` : The end point `[x, y]` or `[x, y, z]`. x, y, z must be integer.
+
+## Examples
+
+	use <pixel/px_line.scad>;
+
+	for(pt = px_line([-10, 0], [20, 50])) {
+		translate(pt) 
+			square(1, center = true);
+	}
+
+![px_line](images/lib2-px_line-1.JPG)
+
+	use <pixel/px_line.scad>;
+
+	for(pt = px_line([-10, 0, -10], [20, 50, 10])) {
+		translate(pt) 
+			cube(1, center = true);
+	}
+
+![px_line](images/lib2-px_line-2.JPG)
+

docs/lib2x-px_polygon.md

@@ -0,0 +1,36 @@
+# px_polygon
+
+Returns points that can be used to draw a pixel-style polygon.
+
+**Since:** 2.0
+
+## Parameters
+
+- `points` : A list of points. Each point can be `[x, y]`. x, y must be integer.
+- `filled` : Default to `false`. Set it `true` if you want a filled polygon.
+
+## Examples
+
+    use <pixel/px_polygon.scad>;
+	use <shape_pentagram.scad>;
+
+	pentagram = [
+		for(pt = shape_pentagram(15)) 
+			[round(pt[0]), round(pt[1])]
+	];
+
+	for(pt = px_polygon(pentagram)) {
+		translate(pt) 
+			linear_extrude(1, scale = 0.5) 
+			    square(1, center = true);
+	}
+
+	translate([30, 0])
+        for(pt = px_polygon(pentagram, filled = true)) {
+            translate(pt) 
+                linear_extrude(1, scale = 0.5) 
+                    square(1, center = true);
+        }
+
+![px_polygon](images/lib2-px_polygon-1.JPG)
+

docs/lib2x-px_polyline.md

@@ -0,0 +1,52 @@
+# px_polyline
+
+Given a list of points. `px_polyline` returns points that can be used to draw a pixel-style polyline.
+
+**Since:** 2.0
+
+## Parameters
+
+- `points` : A list of points. Each point can be `[x, y]` or `[x, y, z]`. x, y, z must be integer.
+
+## Examples
+
+	use <pixel/px_polyline.scad>;
+	use <shape_pentagram.scad>;
+
+	pentagram = [
+		for(pt = shape_pentagram(15)) 
+			[round(pt[0]), round(pt[1])]
+	];
+
+	for(pt = px_polyline(concat(pentagram, [pentagram[0]]))) {
+		translate(pt) 
+			linear_extrude(1, scale = 0.5) 
+			    square(1, center = true);
+	}
+
+![px_polyline](images/lib2-px_polyline-1.JPG)
+
+	use <pixel/px_polyline.scad>;
+	use <sphere_spiral.scad>;
+
+	points_angles = sphere_spiral(
+		radius = 20, 
+		za_step = 5
+	);
+
+	points = [
+		for(pa = points_angles) 
+		let(pt = pa[0])
+		[round(pt[0]), round(pt[1]), round(pt[2])]
+	];
+
+	for(a = [0:30:330]) { 
+		rotate(a) 
+			for(pt = px_polyline(points)) {
+				translate(pt)
+					cube(1, center = true);
+			}
+	}
+		
+![px_polyline](images/lib2-px_polyline-2.JPG)
+

docs/lib2x-px_sphere.md

@@ -0,0 +1,22 @@
+# px_sphere
+
+Returns points that can be used to draw a pixel-style sphere.
+
+**Since:** 2.0
+
+## Parameters
+
+- `radius` : The radius of the sphere. The value must be an integer.
+- `filled` : Default to `false`. Set it `true` if you want a filled sphere.
+- `thickness`: Default to 1. The thickness when `filled` is `false`. The value must be an integer.
+
+## Examples
+
+	use <pixel/px_sphere.scad>;
+
+	for(pt = px_sphere(10)) {
+		translate(pt)
+			cube(1, center = true);
+	}
+
+![px_sphere](images/lib2-px_sphere-1.JPG)