53 lines
1.7 KiB
OpenSCAD
53 lines
1.7 KiB
OpenSCAD
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module triangularPrism(angle, side1, side2, height) {
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linear_extrude(height)
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polygon(points = [[0, 0], [0, side1], [side2 * sin(angle), side2 * cos(angle)]]);
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}
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module arcCylinder(outerRadius, height, degrees, innerRadius = 0, center = false) {
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epsilon = 0.01;
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degToCut = 360 - (degrees % 360);
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triDeg = degToCut % 60;
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triSideLen = (outerRadius + epsilon) / cos(triDeg / 2);
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fullTriSide = (outerRadius + epsilon) / cos(30);
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numFullTriangles = floor(degToCut / 60);
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difference() {
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// Main cylinder body
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cylinder(h=height, r=outerRadius);
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// Exclusion
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translate([0, 0, -1*epsilon]) union() {
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// Inner cylinder (to form hole creating the wall)
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if (innerRadius > 0) {
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cylinder(h=height + 2*epsilon, r=max(0, innerRadius));
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}
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// Partial circle cut-out
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if (degToCut < 360) {
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rotate([0, 0, -90 - 60 * numFullTriangles]) union() {
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// All 60-degree cuts get an eqilateral triangle.
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if (degToCut >= 60) {
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for (i = [1:numFullTriangles]) {
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// rotate([-60 * i, 0, 0]) mirror([0, 1, 0]) cube([cubeSideLen, cubeSideLen, height + 2*epsilon]);
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rotate([0, 0, 60 * i]) triangularPrism(
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angle = 60.1,
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side1 = fullTriSide,
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side2 = fullTriSide,
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height = height + 2*epsilon);
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}
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}
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// Cut out the remaining angle with a triangular prism
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rotate([0, 0, 0.1]) triangularPrism(
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angle = triDeg + 0.1,
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side1 = triSideLen,
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side2 = triSideLen,
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height = height + 2*epsilon);
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}
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}
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}
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}
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}
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