Hi,

I'll render previz by opengl rop. I need matte all objects to isolate main actor. But ogl rop hasn't “force matte” parameter.
Is there any method to matte out objects in ogl? If not, is there some simple way to set all matte objects to pure black in ogl?

Thanks!

I don't think opengl can do matte shading.

- for pure black you can use a Toonshader - it worked for me

w_maro
- for pure black you can use a Toonshader - it worked for me

it's easy to get all black in the color channel, but what about black alpha that occludes? I'm not sure if that's possible in a single pass.