"Christoph Hormann" wrote 
> That sounds really fast.  Last time i tried an image map in isosurface
> functions it felt incredibly slow, but that could have been a different
> reason.
> 
> Christoph

That might be due to an interpolation bug in 'image.c'.  
I am not sure  it still exists in v3.5 because I don't have the source 
code of v3.5.

Anyway, I will report it in povray.beta-test.

R. Suzuki

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