Op 28-10-2021 om 16:38 schreef Thomas de Groot:
> Strange. Somehow, I must have changed something, but now renders take a 
> much longer time, more in the range of several hours (and photons jumped 
> to 3Gb). I do not remember what is different. :-/
> 
Found the culprit! :-)

I had changed 'union' to 'merge' in the mesh2 object. In this particular 
case of well-behaving crystal faces, that is unnecessary. The render 
speed difference is dramatic indeed.

-- 
Thomas

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