Cryptomatte AOVs not working in Arnold 6 with both GPU and CPU rendering?

[mpowers]

It seems Cryptomatte AOVs are not working in Arnold 6 with both GPU and CPU rendering (MaxtoA 4.0.2.24). I see it is listed as not working with GPU renders, but there is no mention of it not working in CPU renders.

Is there a date when this feature will be re-enabled? This is a big part of our workflow.

Thnx

[Stephen.Blair]

Cryptomatte works with Arnold 6, I just tested it the other day. If there's a problem, it's either the scene set up or the specific plugin you're using.

Update: I just tried with 3ds Max 2020 and the latest MAXtoA, and cryptomatte worked.

[michiel.van.gasse]

It works on my end with cpu. Latest updates and max version.

Probably the same issue as the other topic. Add the cryptomatte to the maps for aov shaders.

[mpowers]

I am using max 2020.0, because of backburner issues we were having with 2020.3. Which max are you using?

This my setup max:

And in AfterFX:

[michiel.van.gasse]

I indeed use max version 2020.3

Did you add the cryptomatte shader as I did? That's not visible from your screenshots.

[mpowers]

I bet that is it. where did it go before MaxtoA 4.x.x

THANK YOU!

[michiel.van.gasse]

It used to be underneath the aov section, you can see it in the documentation:

https://docs.arnoldrenderer.com/display/A5AF3DSUG/Cryptomatte

Now it has the same location, but the aov manager has a popup window.(the window in your screenshot)

So go to the render settings and the aov tab and there add the cryptomatte map to it like on my screenshot.

[mpowers]

Thnx Michiel and Stephen. That was straight up user error 😞

However, once I moved from 2020.0 to 2020.3 and the most recent MAXtoA, only the CPU renders build the correct cryptomatte EXRs.

[michiel.van.gasse]

Yes I have the same experience, gpu doesn't work.