Maya includes a hardware plug-in that you can use to create CgFX hardware shaders.
To see CgFX shaders, you must have a supported video card.
You should only use graphics cards that are qualified for Maya and supports GLSL. Check the Autodesk website (www.autodesk.com/hardware) for the most accurate information about qualified hardware.
You cannot use CgFX shaders that contain certain effects in Maya:
Shaders that deform geometry are not supported.