Proxy and multimatte/idpass

[paulDryzen]

Hi,

we have a small problem with rendering a matte pass for vray proxies.
The proxies have some maya materials assigned and they all render fine in all passes.

Only in my additional matte passes they don´t show up.

I tried both the multi_matte and material ID pass.

I think it could be the problem that you connect a shader into the proxies, not the shading group?!?

Paul

[vladimir.nedev]

Hi Paul,

the materials that are connected to the proxy, do they have shading groups that they connect to ? V-Ray will take the first shading group the material connects to with its outColor attribute and use this for the material id color/value.

Greetings,
Vladimir Nedev

[paulDryzen]

Thanks for the fast answer!

I´ve found the "problem"
With a proxy in your scene you´ll get these proxy shaders. They have a input for the shaders and a connected shading group.
This shading group has unfortunately no effect with the matte passes.
So you need to add a shading group to the shader which is connected into the proxy shader.

Got it working now. (my shaders which are connected into the proxy shaders are all without shading groups...)

Thanks again.

Paul

[vladimir.nedev]

Aha, so you are using a relatively new nightly build with the new proxy material system. It shouldn't be too much of a problem to use the VRayMeshMaterial's ( that's the node type of the proxy shader you're talking about) shading group to get the material id for the materials that don't have a shading group (or have a shading group but no material id attribute has been added to it).

Greetings,
Vladimir Nedev