Hello everyone,
we are dealing with a bit of a headscratcher. Right now we are working with the latest V-Ray 6 version in Maya 2023 and are trying to use cryptomattes for materials.
However, we keep having the issue that the metadata part of the cryptomatte is not included in the pass during the rendering. That of course means, that in Nuke for example we only have random numbers instead of the material names. This is a big problem, as many of our Nuke scripts rely on material names to pick the correct masks from the cryptomatte. This problem is not easily traceable to any specific scene setup in maya. It has affected refrenced materials, local materials in scenes, some with namespaces, some without, some switch materials, some not. Sometimes it seems to happen in older scenes that have a history in older Maya Versions, sometimes it happens in a fresh scene. It is really inconsistent as far as I can see, but always disruptive when it happens.
It should be said that right now 70% of our renderings are fine, and the other 30% have these issues.
Are there any limitations to cryptomattes I’m not aware of or some settings that are known to cause this kind of problem?
Additionally, we sometimes have cryptomattes whose masks cannot be picked at all in Nuke. These seem to be broken entirely.
I would be glad to recieve some suggestions on how to avoid these problems in the future.
Thanks!