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Richard Milewski
2025-06-21 12:35:16 -07:00
parent a0ba3cb6e6
commit 8224ab1006
2 changed files with 16 additions and 17 deletions
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@@ -409,7 +409,7 @@ _ANCHOR_TYPES = ["intersect","hull"];
// Things get difficult when the objects are curved, or even when their edges are not neatly aligned with the coordinate axes. // Things get difficult when the objects are curved, or even when their edges are not neatly aligned with the coordinate axes.
// In these cases, the library may provide multiple different anchoring schemes, called the anchor types. When a module supports // In these cases, the library may provide multiple different anchoring schemes, called the anchor types. When a module supports
// multiple anchor types, use the `atype=` parameter to select the anchor type you need. // multiple anchor types, use the `atype=` parameter to select the anchor type you need.
// . // .
// First consider the case of a simple rectangle whose corners have been rounded. Where should the anchors lie? // First consider the case of a simple rectangle whose corners have been rounded. Where should the anchors lie?
// The default anchor type puts them in the same location as the anchors of an unrounded rectangle, which means that for // The default anchor type puts them in the same location as the anchors of an unrounded rectangle, which means that for
// positive rounding radii, they are not even located on the perimeter of the object. // positive rounding radii, they are not even located on the perimeter of the object.

31
skin.scad
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@@ -3458,10 +3458,6 @@ function associate_vertices(polygons, split, curpoly=0) =
) )
associate_vertices(newpoly, split, curpoly+1); associate_vertices(newpoly, split, curpoly+1);
// Section: Texturing // Section: Texturing
// Some operations are able to add texture to the objects they create. A texture can be any regularly repeated variation in the height of the surface. // Some operations are able to add texture to the objects they create. A texture can be any regularly repeated variation in the height of the surface.
// To define a texture you need to specify how the height should vary over a rectangular block that is repeated to tile the object. Because textures // To define a texture you need to specify how the height should vary over a rectangular block that is repeated to tile the object. Because textures
@@ -3543,12 +3539,15 @@ function associate_vertices(polygons, split, curpoly=0) =
// dots together. But in 3D example we need to triangulate the points on a grid, and this triangulation is not unique. // dots together. But in 3D example we need to triangulate the points on a grid, and this triangulation is not unique.
// The `style` argument lets you specify how the points are triangulated using the styles supported by {{vnf_vertex_array()}}. // The `style` argument lets you specify how the points are triangulated using the styles supported by {{vnf_vertex_array()}}.
// In the example below we have expanded the 2D example into 3D: // In the example below we have expanded the 2D example into 3D:
//
// ```openscad // ```openscad
// [[0,0,0,0], // [[0,0,0,0],
// [0,1,1,0], // [0,1,1,0],
// [0,1,1,0], // [0,1,1,0],
// [0,0,0,0]] // [0,0,0,0]]
// ``` // ```
//
// Continues:
// and we show the 3D triangulations produced by the different styles: // and we show the 3D triangulations produced by the different styles:
// Figure(3D,Big,NoAxes,VPR=[45.5,0,18.2],VPT=[2.3442,-6.25815,3.91529],VPD=35.5861): // Figure(3D,Big,NoAxes,VPR=[45.5,0,18.2],VPT=[2.3442,-6.25815,3.91529],VPD=35.5861):
// tex = [ // tex = [
@@ -3623,7 +3622,7 @@ function associate_vertices(polygons, split, curpoly=0) =
// extra points can be introduced in the interior of faces leading to unexpected irregularities in the textures, which appear // extra points can be introduced in the interior of faces leading to unexpected irregularities in the textures, which appear
// as extra triangles. These artifacts can be minimized by making the VNF texture's faces as large as possible rather than using // as extra triangles. These artifacts can be minimized by making the VNF texture's faces as large as possible rather than using
// a triangulated VNF, but depending on the specific VNF texture, it may be impossible to entirely eliminate them. // a triangulated VNF, but depending on the specific VNF texture, it may be impossible to entirely eliminate them.
// Figure(3D,Big,NoAxes,VPR=[140.9,0,345.7],VPT=[9.48289,-0.88709,5.7837],VPD=39.5401): The left shows a normal bricks_vnf texture. The right shows a texture that was first passed through {{vnf_triangulate()}}. Note the extra triangle artifacts visible at the ends on the brick faces. // Figure(3D,Med,NoAxes,VPR=[140.9,0,345.7],VPT=[9.48289,-0.88709,5.7837],VPD=39.5401): The left shows a normal bricks_vnf texture. The right shows a texture that was first passed through {{vnf_triangulate()}}. Note the extra triangle artifacts visible at the ends on the brick faces.
// tex = texture("bricks_vnf"); // tex = texture("bricks_vnf");
// cyl(d=10,h=15,texture=tex, tex_reps=[4,2],tex_samples=5,rounding=2); // cyl(d=10,h=15,texture=tex, tex_reps=[4,2],tex_samples=5,rounding=2);
// up(7)fwd(-3)right(15)cyl(d=10,h=15,texture=vnf_triangulate(tex), tex_reps=[4,2],tex_samples=5,rounding=2); // up(7)fwd(-3)right(15)cyl(d=10,h=15,texture=vnf_triangulate(tex), tex_reps=[4,2],tex_samples=5,rounding=2);
@@ -3632,18 +3631,18 @@ function associate_vertices(polygons, split, curpoly=0) =
// **img2scad.py** is a python script that creates a texture array from most common raster image formats, including gif, png, jpeg. // **img2scad.py** is a python script that creates a texture array from most common raster image formats, including gif, png, jpeg.
// **img2scad.html** contains a javascript creates a texture array from any image your browser can render. // **img2scad.html** contains a javascript creates a texture array from any image your browser can render.
// **geotiff2scad.py** is a python script creates a texture array from geotiff depth maps. // **geotiff2scad.py** is a python script creates a texture array from geotiff depth maps.
// . // .
// All three of these scripts place a named array in an .scad file with names specified at run time. These files should be included in your model. // Each of these scripts places a named array in an .scad file with names specified at run time. Use include<> to add the array to your model.
// Figure(3D,Med,NoAxes): On the left the `tex_samples` value is small and the texture is blocky. On the right, the default value of 8 allows a reasonable fit to the cylinder. // .
// xdistribute(spacing=5){ // This is some text before the test image.
// cyl(d=10/PI, h=5, chamfer=0, // .
// texture=texture("bricks_vnf"), tex_samples=1, tex_reps=[6,3], tex_depth=.2); // Here is a globe created using geotiff2scad.py to generate the texture array.
// cyl(d=10/PI, h=5, chamfer=0, //
// texture=texture("bricks_vnf"), tex_samples=8, tex_reps=[6,3], tex_depth=.2); // ![Geotiff Example](images/skin/globe_animation.png)
// } // <img align="left" alt="Geotiff Example" src="images/skin/globe_animation.png" width="320" height="240">
//
// Continues: // Continues:
// This is some text after the test image.
// Function: texture() // Function: texture()
// Topics: Textures, Knurling // Topics: Textures, Knurling
// Synopsis: Produce a standard texture. // Synopsis: Produce a standard texture.