Enable the mip production shader in Maya mentalRay

The Mental Ray production shaders are hidden by default.  mip_* mib_* mia_*

Simply go to your script editor, type in:

optionVar -intValue "MIP_SHD_EXPOSE" 1;

Also check out info on the finest in Mental Ray websites from Zap

http://mentalraytips.blogspot.com.br/2007/10/production-shaders-hidden-treasures-of.html

To find more info you can always search "Mental Ray production shaders" as well as read the 2013 Mental Ray production manual online.

http://docs.autodesk.com/MENTALRAY/2013/ENU/mental-ray-help/