What about NOT using the cryptomatte? But some other type of matte.
Maybe another AOV where I can ID the vertex map information?

Hmm. Well I am wondering if there is another way to matte out the vertex material then. If not in a cryptomatte AOV, then what about some other object ID (or similar) that I can apply to the material that is revealed?

I am looking to add a cryptomatte for every material in a scene, but some of my materials have a vertex map to reveal a second material. Can I add a material ID for the material being revealed with the vertext map in the node editor?

Yes that worked. Thank you.

Hey everyone. I have something that is confusing me.

I have a matrix object with mode set to "object" and has RS object pulling plants onto the object. (growing plants on geometry). I added a plain effector set to -1 uniform scale (so the plants grow with a vertex map), and a spherical field.

All is well and good (plant do grow) but the matrix object is also putting the plants in the center of the scene before the animation growth. See attached. Why is this happening? The plants do eventually disappear but not after 30 frames or so.

I think it has to do with the scaling plain effector, but why?