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based on vertex normal

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Justin Lin 2022-04-28 10:08:39 +08:00
parent 4510f43cc0
commit 05443666c3
1 changed files with 3 additions and 2 deletions
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src/surface/sf_thickenT.scad
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@ -41,8 +41,9 @@ module sf_thickenT(points, thickness, triangles = undef, direction = "BOTH", con
if(is_list(direction)) {
dir_v = direction / norm(direction);
mid = sorted(points)[leng_pts / 2];
tri = cnn_tris[search([mid], points)[0]][0];
nv = _face_normal([for(i = [2, 1, 0]) points[tri[i]]]); // OpenSCAD requires clockwise
tris = cnn_tris[search([mid], points)[0]];
nvs = [for(tri = tris) _face_normal([for(i = [2, 1, 0]) points[tri[i]]])]; // OpenSCAD requires clockwise
nv = sum(nvs) / len(nvs);
off = dir_v * thickness;
pts = [for(p = points) p + off];