Vray Denoiser denoises Material ID channel

[andybot_cg]

Denoiser seems to interfere with the color channels. If I have denoiser enabled, the material ID pass is messed up. I've tried toggling through all the color channel checkboxes, but it's only when I disconnect the denoisr that the channel renders fine. I tried this with the latest standalone and blender builds (Feb 27th vray 3.57) First image is without denoiser enabled, 2nd is what happens with denoiser plugged in.

[andybot_cg]

bump. I can't use Denoiser, or else I have to render twice. This is a pretty significant bug (Especially as I'm on a deadline and at this point my Material ID channel is more critical than denoiser. I've got a zillion little color tweaks client is asking me to make.) Are there any settings I have missed?

[poseidon4o]

Which blender build are you using and how are you setting the material id color?

And can you make simple scene where this shows up?

[andybot_cg]

This is with a recent build (March 1 Blender build, February 27 Vray 3.57 build.)
The only difference in the color channel renders below is that the one that looks correct has the denoiser node unplugged from the channels container.

Which blender build are you using and how are you setting the material id color?

And can you make simple scene where this shows up?

[poseidon4o]

Thanks for the scene - this seems like vray issue. You can try plugging the denoiser in the last channel slot - this could be a workaround until the issue is fixed.

[andybot_cg]

Thanks!! That seems to work, you saved the day! I had no idea the order of the channels made a difference