24 lines
1.1 KiB
OpenSCAD
24 lines
1.1 KiB
OpenSCAD
D=300; // start diameter
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N=1; // number of spirals
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FN=100;
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$fn=FN;
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include <../libraries/path_extrude.scad>;
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//Distinction from v4 compressed spiralPath generation into single line
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module spiral (count = 40, start_d = 48, spacing = 2.095) {
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facet_size = 10;
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bottom = 1.2;
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top = .3;
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top_offset = (bottom - top);
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h = 2.2;
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facetProfile = [[0, 0], [top_offset, -h], [bottom, -h], [bottom, 0]];
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spiralPath = [ for (s = [0 : count - 1]) for(t = [0 : ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ) - 1]) [(((start_d + (s * spacing * 2)) / 2) + (t * (spacing / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size )))) * cos(t * (360 / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ))), (((start_d + (s * spacing * 2)) / 2) + (t * (spacing / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size )))) * sin(t * (360 / ceil( (PI * pow((start_d + (s * spacing * 2)) / 2, 2)) / facet_size ))), 0] ];
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path_extrude(exShape=facetProfile, exPath=spiralPath);
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}
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spiral(N, D); |