VRayEnvironmentFog Artifacts with Adaptive Lights, and Lots of Noise No Matter What

V-Ray V-Ray GPU Issues
1

I have a scene with VRayEnironmentFog rendering in VRay5GPU CUDA. I am seeing some nasty artifacts with Adaptive Lights enabled. Light Tree and Full Eval seem to get rid of these.

FYI, these have a VrayEdgesTex to intentionally see the polygon lines. SHould also mention there are a number of VRayLightMtls in there. I may eventually replace those with lights for render speed.

AdaptiveBlocthes.PNG.jpg
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See the horrible sharp edges blotches? These go away without Adaptive Lights. They go away without VRayEnvironmentFog as well.

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Another issue is that with the fog turned on I get a ton of white single pixel noise (like salt and pepper noise without the pepper). This noise actually seems to INCREASE the longer the scene renders. The surface is reflective, but I tried disabling reflection in the VRayEnvironmentFog settings to no avail. I should be able to send (privately) a scene that shows both these issues.

Noise.PNG.jpg
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How to get rid of the white spec noise??? Removing VRayEnvironmentFog makes it go away, but of course I would like the effect.

Any insight? Will send a scene to support.

Thanks in advance.

2

FYI: Your ticket number is: 307-746-5149

3

Regarding the adaptive lights artifacts, it is caused by the disabled “Affect Shadows” fog option in conjunction with VRayLightMtls with an activated direct illumination. I’ve logged it (internal bug-tracker id: VGPU-4937) for developer analysis.
The bright spots are called fireflies. They usually appear when very bright rays manage to hit a light source directly (in your case the VRayLightMtls). It may be best to switch the light materials with VRayLights to avoid both issues.