Here’s a way to output single matte pass for multiple objects/shaders using writeToColorBuffer node in Mental Ray. This is handy in situations when you want a combined matte pass for various shaders applied to multiple objects. For e.g: say you have a room where roof comprises of various elements like main roof, fan lights, false ceiling boards etc. Now to separate the complete roof in composite you would want a single matte pass but writeToColorBuffer node takes only single shader as an input.
JS_MultiLayer shader from Jan Sandstörm comes handy in such situations as it allow us to layer multiple shaders. Once we combine all shaders we then feed it to writeToColorBuffer.
There is one more step to do before we can get the combined matte pass. WriteToColorBuffer works for shaders which are applied to objects in the scene but if we apply the combined JS_Multilayer shader to objects then we may not get other required passes like color, master beauty etc. as we want them. So rather than applying the JS_Multilayer shader to objects in scene we plug it in the “shading group” of the shaders for which we need the combined matte pass. Dont worry if you dont understand what this means as I have attached a scene file so you can have a look at the connections.
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One thing I noticed is this procedure works better with mia_x, mia_x_passes and JS_Multilayer but somehow doesn’t give needed results with Maya shaders like Lambert, Blin etc.
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