41 lines
863 B
OpenSCAD
41 lines
863 B
OpenSCAD
$fn=32;
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card = 1;
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corn = 1 / sqrt(2);
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oct = [
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[card,0],
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[corn,corn],
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[0,card],
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[-corn,corn],
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[-card,0],
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[-corn,-corn],
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[0,-card],
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[corn,-corn]
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];
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function scale_xy(xy, m) = let(nz_xy = sign(xy == 0 ? 1 : xy) * max(abs(xy), 0.0000001)) [ for (i = m) [i.x * nz_xy, i.y * nz_xy]];
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function normalize(vec) = vec / norm(vec);
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function grow(shape, mag) = [ for (i = shape) i + normalize(i) * mag];
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function add_radius(shape, rad) = grow(shape, rad/cos(180/len(shape)));
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function lerp(a,b,t) = a + (b - a) * t;
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module round_poly(shape, radius, sharpness = 0){
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corner_r = lerp(radius, 0, sharpness);
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corner_offset = lerp(0, radius, sharpness);
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minkowski(){
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polygon(add_radius(scale_xy(0, shape),corner_offset));
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circle(max(corner_r, 0.0001));
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}
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}
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radius = 3;
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round_poly(oct,radius, $t); |