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triangles : counter-clockwise

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Justin Lin
2021-06-26 20:43:53 +08:00
parent 74ed27cbc4
commit 43d25322f0
1 changed files with 6 additions and 5 deletions
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11
src/surface/sf_thicken_tri.scad
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@@ -5,6 +5,9 @@ use <../util/sum.scad>;
use <../surface/sf_solidify_tri.scad>; use <../surface/sf_solidify_tri.scad>;
module sf_thicken_tri(points, triangles, thickness, direction = "BOTH") { module sf_thicken_tri(points, triangles, thickness, direction = "BOTH") {
// triangles : counter-clockwise
tris = [for(tri = triangles) [tri[2], tri[1], tri[0]]];
ascending = function(e1, e2) e1 - e2; ascending = function(e1, e2) e1 - e2;
function connected_tris(leng_pts, triangles) = function connected_tris(leng_pts, triangles) =
@@ -40,7 +43,7 @@ module sf_thicken_tri(points, triangles, thickness, direction = "BOTH") {
let(v = cross(tri[2] - tri[0], tri[1] - tri[0])) v / norm(v); let(v = cross(tri[2] - tri[0], tri[1] - tri[0])) v / norm(v);
leng_pts = len(points); leng_pts = len(points);
cnn_tris = connected_tris(leng_pts, triangles); cnn_tris = connected_tris(leng_pts, tris);
if(is_list(direction)) { if(is_list(direction)) {
dir_v = direction / norm(direction); dir_v = direction / norm(direction);
@@ -103,7 +106,6 @@ points = [for(i = [0:50]) rands(-200, 200, 2)];
delaunay = tri_delaunay(points, ret = "DELAUNAY"); delaunay = tri_delaunay(points, ret = "DELAUNAY");
// count-clockwise (dotSCAD 2D polygon convention)
indices = tri_delaunay_indices(delaunay); indices = tri_delaunay_indices(delaunay);
shapes = tri_delaunay_shapes(delaunay); shapes = tri_delaunay_shapes(delaunay);
@@ -112,12 +114,11 @@ for(tri = shapes) {
polygon(tri); polygon(tri);
} }
// triangles: clockwise (openscad 3D face convention)
triangles = [for(tri = indices) [tri[2], tri[1], tri[0]]];
pts = [for(p = points) [p[0], p[1], rands(100, 120, 1)[0]]]; pts = [for(p = points) [p[0], p[1], rands(100, 120, 1)[0]]];
thickness = 5; thickness = 5;
sf_thicken_tri(pts, triangles, thickness); sf_thicken_tri(pts, indices, thickness);
*/ */