been testing around, it seems to be a problem with displacement. I got two overbright or invalid material warnings, bot from displaced objects. If I use 3D mapping instead of 2D, the problem goes away.
I searched for black holes in the forum, and found a thread where you also say to increase interp samples. I must say I do not agree. Altough it’s quite possible the black spots go away by doing so, it’s only because the interpolation blurs them out. So the actual problem is still there. Like in my case, I think there’s always something in the scene causing this problem. By increasing interp you blur out the GI quality, which isn’t a good thing usually. I use low values all the time just to keep the nice GI detail In this scene the interp was = 20 though.
No the displacement is on the floor and on a floor in the kitchen which isn’t visible to the camera. Somehow it returns invalid colors and shoots invalid rays to the walls I guess.
I tought the problem could occur when not mapping them? I have planer uvw maps on both displaced floors. But with 3D instead of 2D displacement the problem is gone.
Must be something with the 2D displacement creating some weird geometry. The resolution paramater was pretty low.
I used 2D because it was faster in the older builds, and I had a slow PC in those days. Now I always use 3D displacement. That’s why I’m not testing it further with the 2D displacement.
In this scene the interp was = 20 though.