> > Has anyone any suggestions how i can speed up the rendering?
>
> Don't use such a complex CSG object. For every ray traced, the whole
> difference needs to be checked, so you get no benefit of bounding (which you
> cannot add manually in a meaningful way to a difference like this object).
> The best approach here is to split the outer cube into eight symmetrically
> identical smaller cubes. This should get you a speed-up of roughly eight
> times right there.
>
> Also, note that you can texture CSGs as a whole, no need to texture each part.

As a quick test I replaced the CSG by a combination of individual boxes.
My quadcore took days for the CSG, in the new version my intel atom laptop takes
seconds :-)
Thanks you all for the suggestions!

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