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Polygon work


I've been doing the enhancements I promised for thermals. The pushing will take some time as I need to prepare keys for SF svn access and build up some courage...

There is one proposal I'd like to discuss though. The problem is current usage of 32 segments approximation. It makes some graphical glitches as the current system of 3600 angle positions do not divide evenly with 32 or 64. 16 is ok as errors cancel out on every second segment. 24, 36 and 40 are fine and the best are divisible by eight as they give vertices at 0, 45 and 90 degrees. Personally I have settled for 24 as a compromise.


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