in news:3d592e2f@news.povray.org Greg M. Johnson wrote:

> Of all that's been written on isosurfaces, is there some place that
> offers tricks on speeding up, such as use of functions inside vs
> outside of declaration, etc?
 
R. Suzuki has shown a few tricks to optimise functions for faster 
rendering involving the use of the f_ph, f_r and f_th functions.
Couldn't find the exact thread though.

Ingo

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