|Mental Ray by Nvidia|
Why does Mental Ray disappear?
Because it's a plugin. It often disappears after Maya crashes or some other unexpected shutdown. Maya developers made sure when they first installed it that Mental Ray would automatically unload and un-plug in the case of an unexpected shotdown of Maya.
How do you bring it back?
Because Mental Ray in Maya is just a plug-in, it can be enabled and disabled just like any other plugin. So, to bring it back, you just go to Window/Settings/Preferences/Plug-in Manager. Once you have launched the plugin manager, scroll down through the list until you reach the magic letters Mayatomr.mll. No check the boxes for Loaded and also for Autoload. Save you preferences.
Mental Ray should load and work as usual now.
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