Multimatte element not working as expected

[Alex_M]

Please check the image below. Why does my Multimatte channel look like this?

[hermit.crab]

Could you send the scene to support@chaosgroup.com so we can take a look?

[Alex_M]

Ok, email sent. Ticket number is 315-228-3075.

[hermit.crab]

Thanks for the provided scene. Everything seems to be working fine. It is possibly a viewport hiccup since the diffuse filter and multimatte passes are next to each other. Does it save correctly on your end?

[Alex_M]

I don't know, but I often see strange stuff happening with channels in Vray 5. Here's an older thread of mine where again strange stuff happened with MultiMateElement.

[hermit.crab]

I cannot seem to reproduce it with the described steps. Do tell if you are able to, so we can investigate and try the suggested solution from the other topic.

[Alex_M]

Ok, I'll try to keep an eye and remember what triggers this.

[Pixelcon]

I just did a region render and everything outside the region in the rgb color channel appeared just like diffusefilter. very strange.

[Alex_M]

Same here! The problem occurred when I did a region render. Maybe that's what triggers the bug?

[Pixelcon]

Seems to be something to do with the denoiser. If I have a region going and the denoiser kicks in, it switches the area outside the region to something from a different pass. If I slide the denoiser opacity down, so disappears the mystery pass...

[hermit.crab]

Pixelcon I am still unable to reproduce the issue. Could you send your scene to support@chaosgroup.com as well?

[Pixelcon]

I'm afraid this scene cannot be shared. But i'll see if I can strip it down for you.

[yavor.rubenov]

For future reference - here I've described what could be causing the issue: https://forums.chaosgroup.com/forum/...69#post1083469
Fix is in the works..