Hi otoy,
We have a tunnel sections that are scattered with itoo. The tunnel sections have mesh light (surface brightness is unchecked). Why does the image get darker, noisier and slower rendering when I scatter more sections (longer tunnel)?
The camera looks at only one tunnel section and the other ones are not even visible.
Does octane calculate lights that are even hundreds of meters away and not in the camera view therefore it is slower and less bright?
note: even the light inside the train gets darker with more tunnel sections. Does octane run out of rays?
Mesh that is not in the camera affects render times
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If I'm understanding you correctly, while the light emitting geometry may not be directly visible within the camera frame, the light rays that the geometry emits certainly can be. More light sources means more calculations and higher sampling requirements. This sounds like a perfect use of the AI Light feature, assuming you need to leave all those emitting surfaces on all the time.
Animation Technical Director - Washington DC