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How to enable mip shaders

 edit the "mentalrayCustomNodeClass.mel", by default it look like this 
search in X:\Autodesk\Maya2012\scripts\others

// Internal MentalRay Nodes. Not meant to be used with Maya.
int $enableMIPShaders = (`optionVar -query "MIP_SHD_EXPOSE"`== 1);

replace the value 1 by 0 like this one and save it, that's all. 

// Internal MentalRay Nodes. Not meant to be used with Maya.
int $enableMIPShaders = (`optionVar -query "MIP_SHD_EXPOSE"`== 0);