OpenSCAD User Manual/example module regular polygon()

Exmaple: regular_polygon() Module

A user defined module can generate the same shapes using some basic math and the polygon() module: 

module regular_polygon(order = 4, r=1)
    { // default parameters give a unit square
         // first divide 360 to make a vector of angles between vertices
    angles=[ for (i = [0:order-1]) i*(360/order) ];
         // use trigonometry to calculate Cartesian coordinates
    coords=[ for (th=angles) [r*cos(th), r*sin(th)] ];
    
    polygon(coords); // generate the polygon
    }
  regular_polygon(); // generate a default <code>regular_polygon</code>

Polygon shapes generated by circle() are drawn inscribed in a circle of the given radius, starting from a first point on the positive X axis.

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