Pabs wrote:

> You might try e-mailing the author of  HF-Lab & other HF programs that have
> this feature to ask the algorithm.

I have talked with John Beale in the past and found him talkative and
willing to share info where possible.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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