Cryptomatte with subobjects, by material id?

[glacierise]

Hi guys,

We're using Cryptomatte a lot, but there's a few gotchas. The thing we're missing most is defining masks per object/material id, and not just objects. Imagine a cached building destruction simulation. You have bricks, wood, glass, etc, and this is loaded in a single Alembic loader. This is giving us just a single mask in Cryptomatte, and we need masks per material - any way to pull that one off?

Thanks!

[matanov]

Request added

[glacierise]

Would be great to have some mechanism to get notified about how these things go. We do keep an eye on changelogs, but still

[matanov]

We are trying to post in the respective thread when the feature is added / the bug is fixed. The ID for this one is VMAX-8524. The alternative for you is to come to the office to say "Hi" with some beers.

[glacierise]

Ok, that should work, thanks

[calvin_smith]

Hi, any update on this?

[vlado]

Yes, this is already in the nightly builds; if you can check it out and let us know if it works fine, it will be great.

Best regards,
Vlado

[calvin_smith]

Great, I don't have access to the nightly currently so I'm going to write to support for that. Thanks Vlado!

[joconnell]

I wonder will this behave with forestpack too? Jumping in on this one also!

[matanov]

If you don't want to wait for the official Hotfix 1 (which should be later this week), you can download the latest stable build from here - https://nightlies.chaosgroup.com/mai...ble/stable_5.1

[calvin_smith]

Hi, I'm using the latest nightly and there is no think like MatID in the cryptomatte. Should I set it as a node user property or there is something I'm missing?
Thanks!

[matanov]

Can you share a simple scene where this is not working?

[calvin_smith]

Sure, here is a teapot with Vraymultisub. Thanks

[calvin_smith]

I noticed that what it does is use the material name, so it means that it needs to be set in the cryptomatte like that but also, it won't work with a Vraymultisub, is that correct?

[matanov]

Yes, the mode in the Cryptomatte is called "node material name" so you need separate sub-materials.