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This is good stuff.
I'll just add few things that might help some folks to make it work.
Copy the shader files in respective folders then
Add the following 2 lines in the "maya.rayrc" file in the */Maya7.0/mentalray folder
link "{MAYABASE}/lib/arbitrarydisplacement.{DSO}"
mi "{MAYABASE}/include/arbitrarydisplacement.mi"
