RT CUDA renders VrayLightMtl brighter than it should

V-Ray V-Ray GPU Issues
1

RT CUDA renders VrayLightMtl brighter than it should if you render with Physical Camera Exposure Control set to “active”. It does this regardless of whether RT is used in Active Shade or Production Rendering mode.

Only CUDA mode seems to be affected. RT CPU and the Advanced renderer render the VrayLightMtl intensity correctly regardless of whether Physical Camera Exposure Control is set to “active” or not. I’m using Vray 3.5 Beta 1 by the way.

Please see below some screenshots + a simple scene for test. Just open it and hit render. After that render with Exposure Control disabled. Then do the same test with RT set to CPU mode.

RT_CUDA_VrayLightMtl_problem.jpg
RT_CUDA_VrayLightMtl_problem.jpg644×777 115 KB

RT_CUDA_VrayLightMtl_problem.zip (92.8 KB)

2

Thanks for the pointer; will check it out.

Best regards,
Vlado

3

The differences come from “Compensate camera exposure” option in the VRayLightMtl. It’s not working with the Exposure control in the env. settings and with the 3ds max PhysicalCamera in CUDA for now.

4

Good to know. Thanks!