I abandoned the blob pattern and function{ } based thunderhead approach for
a slightly more cumbersome but faster rendering one.  I am not completely
satisfied with it yet, but with a full scene and other clouds I think it
would do pretty well.
  Full scene is very, very WIP, will post when deemed acceptable.

          Reactor

PS. this took about 7.5 hours on a P4 running at 3.4GHz

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