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length = 10;
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n = 5;
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// Draw all geometry
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//translate([0,0]) polygon(ngon(n, length));
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translate([0,0]) hollow_ngon(n, length);
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// Simple list comprehension for creating N-gon vertices
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function ngon(num, r) =
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[for (i=[0:num-1], a=i*360/num) [ r*cos(a), r*sin(a) ]];
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module hollow_ngon(num, r, width = 1) {
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difference() {
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translate([0,0]) polygon(ngon(num, r));
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translate([0,0]) polygon(ngon(num, r-width));
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}
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}
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l = 10;
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CubePoints = [
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[ 0, 0, 0 ], //0
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[ 10, 0, 0 ], //1
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[ 10, 7, 0 ], //2
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[ 0, 7, 0 ], //3
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[ 0, 0, 5 ], //4
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[ 10, 0, 5 ], //5
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[ 10, 7, 5 ], //6
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[ 0, 7, 5 ]]; //7
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CubeFaces = [
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[0,1,2,3], // bottom
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[4,5,1,0], // front
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[7,6,5,4], // top
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[5,6,2,1], // right
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[6,7,3,2], // back
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[7,4,0,3]]; // left
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polyhedron( CubePoints, CubeFaces );
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//The coordinates of the 12 additional vertices are (0, ±(1 + h), ±(1 − h2)), (±(1 + h), ±(1 − h2), 0) and (±(1 − h2), 0, ±(1 + h)).
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// (0, ±(1 + h), ±(1 − h2)),
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// (0, (1 + h), (1 − h2) ),
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// (±(1 + h), ±(1 − h2), 0)
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// (±(1 − h2), 0, ±(1 + h))
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steps = 50;
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sides = 5;
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vert = [
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]
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points = [
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// first expression generating the points in the positive Y quadrant
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//(0, ±(1 + h), ±(1 − h2)),
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for (a = [0 : sides]) [ a, 10 * sin(a * 360 / steps) + 10 ],
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// second expression generating the points in the negative Y quadrant
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for (a = [steps : -1 : 0]) [ a, 10 * cos(a * 360 / steps) - 20 ],
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// additional list of fixed points
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[ 10, -3 ], [ 3, 0 ], [ 10, 3 ]
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];
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polygon(points);
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