| include <C:\libs\OpenSCad\plot-function\plot_function.scad> // https://github.com/rcolyer/plot-function
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| module PolarFuncExample(){
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| $fa=1; $fs=0.4;
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| function PolarFunc1(r, a) = 30 + 1.3*cos(8*a);
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| difference() {
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| PlotPolarFunction(1, 15);
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| translate([0, 0, -1]) cylinder(r=13, h=40);
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| }
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| }
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| PolarFuncExample();
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