Attached Link: http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2712423

There are some tutorials in this thread, from at least 2 different perspectives.  It can get a bit confusing, but, there are the "hows, what's, and whys" in there, in both mathematic and aesthetic reasoning.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.