>   Wouldn't using the internal mandelbrot pattern speed up things a bit?

Hell yeah!

...but there *isn't* one for the cubic Mandelbrot...

Andrew @ home.

PS. I just remembered about the "select" function... I think I may be 
able to use this to truncate the computation of escaping orbits... the 
isosurface function will be yet more complex, but might well go a tad 
faster...

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