What do you mean with "variance clamping"? The only clamping I know yet is Light Paths>Clamping.Dade wrote: ↑Tue Oct 22, 2019 10:04 amHere, with this scene, happens only some time: this makes the problem very hard to investigated. It may be related to variance clamping, can you check if it happens when variance clamping is disabled ? And if CPU/GPU hybrid rendering is disabled ?
For the following three tests I stitched clamping off.
Tested are CPU only, openCL only, openCL plus CPU. CPU does not show the strange patterns even with a few samples.
Animated GIF, please click to view I have found another issue, it might be related to the one above. Again the patterns around the outer sphere do not appear on CPU only.
Tested are CPU hybrid, openCL path only Random, openCL hybrid Sobol. The pattern does also appear with openCL hybrid and Random.
Animated GIF, please click to view And here is the scene containing the half Null Glossy sphere with Glass sphere, homogeneous volume, inside: