37 lines
890 B
OpenSCAD
37 lines
890 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(shape, xy, allow_zero = false) = let(s = allow_zero ? xy : sign(xy == 0 ? 1 : xy) * max(abs(xy), 0.0001)) [ for (i = shape) [i.x * s, i.y * s]];
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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, size = 0, 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(shape,size),corner_offset));
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circle(max(corner_r, 0.0001));
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}
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}
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round_poly(oct, radius, 4, 0); |