VRayLightMix produces artifacts when disabling VRayLightMix channels

[Alex_M]

I'm getting artifacts with VRayLightMix when I disable a few light channels. Check the screenshot below and notice the color artifacts on the chairs. Can I avoid this or is it a bug? I've noticed this happening on other scenes as well. Sometimes it happens if I decrease the channel intensity too.

By the way, what information does the "Rest" channel contain? I don't see this clearly described in the help docs.

[nikoleta.garkova]

Hi Alex,

Not sure here, looks like it might be due to poor sampling. Are the color values clamped? Is it possible to forward us a sample scene with this reproducible so we can check as well?

To answer your other question - if you go to the LightMix RE parameters > Group By > Manual light selects - Render channels will be created based on the existing Light Select render elements in the scene. Lights that are not specified there, are collected in single render channel called Rest.

[Alex_M]

Hi Nikoleta,

Strange. Today I tried turning off the same group of lights again and it didn't cause weird colors. I turned off another light though and the weird colors happened again. Please see the enclosed screenshots. I've sent the scene to support. Ticket number is: 347-771-9693

By the way, I don't have my LightMix grouped by "Manual light selects". It is set to "Instanced lights". So is it normal that I have a "Rest" lights channel in this case?

[valentin_alek]

Same problem, it would've been cool to know if this is resolved or not, and why it's doing this

[hermit.crab]

Same problem, it would've been cool to know if this is resolved or not, and why it's doing this

Mind if you send us the scene so we can troubleshoot it?