i have same problem..but, the custom channel could be helpful little bit.(not perfectly working..)
after making some custom channels in render option, you should specify those in the vray material editor. you could find 'material result' button just below the id color in the option section of the material editor.
J
Posts made by jakeshin
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RE: V-ray VFB channels issue. Help needed!posted in V-Ray
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RE: Exporting channels not working in Vray?????????posted in Extensions & Applications Discussions
did u solve the problem? i'm faced with same problem. if solved, please share the solution..