Maya 2008 and up, was shipped with some un-supported mental ray Shaders called mip (mental images production) Shaders.
To expose theses Shaders in Maya we need to alter the mel script “mentalrayCustomNodeClass.mel” in this folder
Edit: It came to my attention there is an easier way of exposing these shaders
in your script editor type
optionVar -intValue MIP_SHD_EXPOSE 1;
restart Maya and the shaders will appear !
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