Warp wrote:
> 
>   How about simply squaring the radius (R*R) instead of using the slow
> sqrt() function?-)

Because that function would have a non-constant gradient.  With the (way 
too large) container box{-5,5} you need quite a high max_gradient to 
correctly render it -> it will be slower than with sqrt().

Of course using the internal function f_sphere() would be even faster.

Christoph

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