Rendering shader-passes

#1

First of all, I’m using Maya 2011 and Mental Ray to render.
So let’s say I have a shader, “Blinn_1”, and I want MR to make a pass just for every face with this material, then another pass with every face with another shader, Blinn_2, etc.
Remember that my objects could have several materials assigned to them i.e. a material could have two diferent shaders in two differente faces.
I could use a flat shader for each to make masks that I could select in Photoshop, but is there an easier way?

#2

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