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61 lines
1.5 KiB
Markdown
61 lines
1.5 KiB
Markdown
# sf_thickenT
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It thickens a surface with triangular mesh.
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## Parameters
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- `points` : A list of `[x, y, z]`s.
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- `thickness` : The depth of the thickening.
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- `triangles` : Determine which points are connected by an edge. All triangles have points in the same direction, counter-clockwise. If it's ignored, `sf_thickenT` would use `[x, y]` to do Delaunay trianglation.
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- `direction` : The direction of thickening. It accepts `"BOTH"` (default), `"FORWARD"` or `"BACKWARD"`. Thickening is applied in both directions from the surface, the direction of the surface normals or the opposite direction to the surface normals. It also accept a direction vector `[x, y, z]`. Thickening is only applied in the direction you give.
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## Examples
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use <surface/sf_thickenT.scad>
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thickness = .2;
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a_step = 15;
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r_step = 0.2;
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function f(x, y) = (y ^ 2 - x ^ 2) / 4;
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points = [
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for(a = [a_step:a_step:360], r = [r_step:r_step:2])
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let(
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x = r * cos(a),
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y = r * sin(a)
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)
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[x, y, f(x, y)]
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];
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sf_thickenT(points, thickness);
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use <triangle/tri_delaunay.scad>
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use <surface/sf_thickenT.scad>
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u_step = 10;
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v_step = 0.2;
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thickness = .2;
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points = [
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for(u = [0:u_step:360], v = [-1:v_step:1])
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let(
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x = (1 + v / 2 * cos(u / 2)) * cos(u),
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y = (1 + v / 2 * cos(u / 2)) * sin(u),
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z = v / 2 * sin(u / 2)
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)
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[x, y, z]
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];
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triangles = tri_delaunay([
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for(u = [0:u_step:360])
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for(v = [-1:v_step:1])
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[v, u]
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]);
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sf_thickenT(points, thickness, triangles);
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