clipka wrote:

> 
> Well, the thing that causes that nested differences aren't collapsed
> into a single one is the /absence/ of code to effect the collapsing, so
> no surprise you didn't find anything :-P
> 
> It probably would have to go in the parsing code for CSG objects.

Well, I'm not going to try and patch the povray sources. That's beyond my 
level. :)
What I did however is store the differenced spheres in a text file and later 
#include that. Doing it this way you don't have the nested differences 
anymore and that has a huge impact on the render time. 7 seconds against 
1:36 minutes.

As it turns out (from what I can determine) povray spends a lot of time 
handling the nested differences.

-- 
Ger

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