VFB bug in VRay 6.2

[Jiri.Matys]

Hi,

I found a weird issue in VFB never happen to me in previous versions.
I turn down one of my lights with Lightmix to 0.3. Looks ok, light changed in VFB but then Denoiser was applied with normal lights like I didnt change lightmix at all so picture looks normal without lightmix changes. And I cant persuade denoiser to adapt to a new lights.

[Jiri.Matys]

Hello, anyone please?

[dimitar_panayotov]

Hi, we were looking into this case. Could you please send a scene and specific steps to reproduce the issue (maybe a short video)? You could do this by submitting a ticket to our support system. Please add a link of this topic to your ticket.

[Jiri.Matys]

Hmm, I test it again and it works ok, denoiser took the settings from lightmix.
I have different problem which i saw earlier but forget to mention it.
Look at the picture. I have a scene with hdri and two lights and environment fog. BUT when I disable one spherical light (in the cottage) in lightmix it looks like it multiply the light so it is much darker then it should be without this light. In region render there is how it should look with this light off.

[dimitar_panayotov]

Please send a simplified version of this scene in the above link. Does it happen in other scenes? How did you achieve the correct result in the Render region - by turning off the light from the light settings? Please add a link of this topic to your ticket.

[Jiri.Matys]

Hmm, I found out that last "Rest" layer in lightmix causing this. But don't know why, there is no reason for it I think.

[dimitar_panayotov]

Do you have "Fog emission" in a color different than black (in the Fog settings)?

[Jiri.Matys]

No, Fog Emission is pure black.

[dimitar_panayotov]

Then, better send a scene, so that we can check it out. Thanks.

[Jiri.Matys]

Scene sent.

[hermit.crab]

Thanks for the provided scene. The issue seems to be caused by VRayEnvironmentFog's Scatter GI option, which causes a difference between a Full Light Select and the RGB (in LightMix, the difference is exhibited in the Rest channel). I've logged an issue regarding this (internal bug-tracker id: VMAX-13804) for dev investigation.

[Jiri.Matys]

Ok, thank you.

[dlparisi]

FYI - I had a similar issue where I had a lightmix setup with a denoiser and any changes to the lightmix were fine until the denoiser kicked in at which point it would revert back to the stock image. I didn't have any fog in the scene so that wasn't it either. I tried a bunch of things like turning off "Rest", turning off lens effects, etc but nothing seemed to work. I tried a quick scene in another 3ds max instance and everything seemed to work just fine. I ended up just saving the scene and reopening it and everything is now working as expected. No idea if it will pop up again. Just some advice if anyone comes across this looking for help.

[Jiri.Matys]

I still found it on some big scene, hard to send it to Chaos.

[ericmao]

I am encountering same problem. The only solution so far close max and run it fresh.