Op 9-8-2022 om 14:53 schreef Thomas de Groot:
> initially, I wanted to concentrate on the hdr light sources though...
> 
...and when I do, no photons are generated!

I use
   photons {
     refraction on
     reflection on
   }

for the sphere with the hdr map, identical to the code for the light 
source. Decreasing spacing down to a ridiculously small value doesn't 
change anything. I must be missing something here...

-- 
Thomas

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