MultiMatte/Materal ID pass-through VrayBlendMat

[mdskay]

hm. bad to hear that it is impossible to implant materials ids based on multimatte passes thru blend material.
but i understand the problem on the programming side. i just thought that any multimatte id has a colorvalue define in the multimatte pass, so its no problem to get the proper masks.
anyway, good work and that it works now with the normal materials id pass. if you find a solution in the future it would be awesome to see this for multimatte ids.

Regards,
Kay

[bigbossfr]

I can't make it work with the multimatte when it is based on material IDs. The multimatte uses the integer material IDs, and I have no way to mix two integers. You will have to use the material ID element instead, which works with the color material IDs and has no problems to blend them.

Best regards,
Vlado

Hi Vlado,
What about this please ?
http://www.chaosgroup.com/forums/vbu...materialselect

Add a mode in the materialSelect renderElement to output a "red flat color", and not the material ?

[vlado]

This would be basically the same as the fixed material ID element.

Best regards,
Vlado

[bradon]

do you think its possible to include multiple Material ID passes.

would basically be sort of combining the concept of Multimatte how you can make multiple RGB passes.

this would be useful in the case that I need to isolate many objects in a render with the Material ID, because I'm using many blend materials. but currently only RGB channel is supported in Material ID so I can only get 3 mattes.

the way it could work is to assign the texture in the Material ID and then ALSO assign a value in the ID, "1", "2", "3" and then assign that corresponding value to the render element.

[sharktacos]

This is an older thread, so has this ben implemented in Vray 2.3?
Here the results I am getting:
material1 material ID=red
material2 material ID=green
blend mask is checkerboard

I would expect to red and green checkers in the material ID. What I instead get is solid yellow (red+green=yellow)

[tashko.zashev]

This is an older thread, so has this ben implemented in Vray 2.3?
Here the results I am getting:
material1 material ID=red
material2 material ID=green
blend mask is checkerboard

I would expect to red and green checkers in the material ID. What I instead get is solid yellow (red+green=yellow)

This is fixed only for the internal builds.