motion data from maya to comp


Is there any way to output the motion data (velocity or maybe motion vector) from maya to a comp sw, through rla or rpf, or something else, like it could be done in max or lw? I’m interrested in sw render or mental ray. And what about the other extra channels in those formats, I mean like coverage, UV and others? Is there a method or plugin to output these?
Thanks for your help!


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