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written by Rene K. Mueller, Copyright (c) 1970, last updated Thu, May 17, 2007
The Ring Dome is a dome composed by evenly distanced rings connected with triangles.
Given d as diameter, and spacing wh (between rings) and wc between connecting points.
- wh = d * π / 4 / nrings
- rn (n=0..nrings) = √ ( (wh * n)2
- cn (n=0..nrings) = 2 * rn * π
- wc = d * π / npoints
- lstrut1 = wh * √2
- lstrut2 = wh * √2