Car Paint Shader Render Passes

#1

Hi all!

I’m using the mia car paint shader in my scene, and I can’t seem to figure out which render passes I need so I can composite everything together. I’ve looked around the internet and can’t find a straight answer.

Thanks!

#2

which ever pass is going to help you achieve the look you want. passes are mostly used to tweak the shot with out having to re-render an allows for finer control. correct me if im wrong Ha!

#3

Its pretty likely that the mia car paint shader was never upgraded to fully use the Maya built in render passes. For that reason you will probably have to use the custom write buffer hypershade feature.
Here is a link to an Autodesk document that goes into a lot of detail related to render passes. Unfortunately it does not include anything specifically about mia_car paint but the document describes how its done with the mia_material.

http://images.autodesk.com/adsk/files/maya_render_pass_concepts_and_techniques_whitepaper_us.pdf

You could generate a set of custom buffers which are the outputs of mia car paint.
Here is a list of the pertinent output attributes involved in the mia_car_paint:

ambient_result
diffuse_result
dirt_result
flake_refl_result
flake_result
indirect_result
reflection_result
result
spec1_result
spec2_result

Hope this is helpful.