77 lines
1.8 KiB
OpenSCAD
77 lines
1.8 KiB
OpenSCAD
$fn = 32;
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gate_height = 50;
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sq_poly = let(corner = 1 / sqrt(2)) [
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[-corner, -corner],
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[corner, -corner],
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[corner, corner],
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[-corner, corner],
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];
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oct_poly = let(corner = 1 / sqrt(2))[
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[-corner, -corner],
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[0,-1],
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[corner, -corner],
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[1,0],
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[corner, corner],
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[0,1],
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[-corner, corner],
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[-1,0],
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];
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octn_poly = let(corner = 1 / sqrt(2 / 1.2))[
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[-corner, -corner],
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[0,-1],
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[corner, -corner],
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[1,0],
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[corner, corner],
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[0,1],
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[-corner, corner],
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[-1,0],
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];
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function scale_xy(xy, m) = [ for (i = m) [i.x * xy, i.y * xy]];
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function add_z(z, m) = [ for (i = m) concat(i, z) ];
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function throw_end(throw, base_offset) = base_offset + gate_height * tan(throw);
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function throw_polygons(shape, throw, base_offset = 0) = [
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add_z(0, scale_xy(max(base_offset,0), shape)),
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add_z(gate_height, scale_xy(throw_end(throw, base_offset), shape))
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];
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function throw_points(shape, throw, base_offset = 0) = let(polys = throw_polygons(shape, throw, base_offset)) [
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for(i = [0,len(polys) - 1]) each polys[i]
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];
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function throw_faces(points) = let(length = len(points), half = len(points) / 2) [
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[for(i = [0:half - 1]) i],
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[half, half + 1, 1, 0],
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[for(i = [length - 1:-1:half]) i],
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for(i = [1:half - 2]) [half + i, half + i + 1, i + 1, i],
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[length - 1, half, 0, half - 1]
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];
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function lerp(a,b,t) = a + (b - a) * t;
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module shape_gate (shape, throw, shaft_r, sharpness = 0) {
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normalized_sharpness = sharpness >= 0 ? sharpness : sharpness;
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sharpness = lerp(1, shaft_r, normalized_sharpness);
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corner_r = shaft_r / abs(sharpness);
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corner_offset = corner_r * (sharpness - 1);
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points = throw_points(shape, throw, corner_offset);
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minkowski(){
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polyhedron(points, throw_faces(points));
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cylinder(1, corner_r);
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}
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}
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sharpness = lerp(0, -0.19, $t);
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echo(sharpness);
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shape_gate(octn_poly, 10, 9 / 2, sharpness);
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