I'm doing a drinks render and I have a carton & bottle sitting on a reflective black floor plane. Behind the carton and bottle there is another wall plane, lit by an octane light with a spotlight gobo in the distribution slot.
For some reason the bottom of the carton is picking up the light along it's bottom edge. The only way I can get rid of it is too intersect the carton with the floor plane.
I can fix this in post but just wondering what's causing it?