Mental Ray will not load in Maya

Autodesk Support

Oct 8, 2023

Products and versions covered

Issue:

When attempting to load Mental Ray in Maya, the following error is thrown:
  
​The Specified procedure could not be found. (mayatomr)

Causes:

This error could be caused by multiple factors:
  1. Corrupted Maya Preferences
  2. Incomplete or corrupted installation of Mental Ray
  3. Corrupted installation of Maya

Solution:

Please attempt the following troubleshooting procedures (these suggestions are in sequential, and in reference to the causes listed above):
  1. Reset your Maya Preferences: preferences can get corrupted after extended use; resetting them will restore Maya to it's default state.
  2. Confirm that the Mental Ray Plug-in is installed and loaded: navigate to Windows > Settings/Preferences > Plug-in Manager > Mental Ray Plug-in > Check Load/Auto Load
mental ray plug-in

NOTE: If Mental Ray does not appear in the Plug-in Manager, this indicates an incomplete installation. Please re-install Mental Ray by logging into Autodesk.com, and downloading a fresh copy from the Maya Updates and Add-ons Tab in the Downloads section

NOTE: Since Maya 2017 version, Mental Ray is not longer included in Maya downloads. If you are experiencing issues with Mental Ray in Maya 2017 and 2018, please refer to NVidia Mental Ray Support
  1. The Maya Installation was corrupted: perform a Clean Install to ensure that all corrupted folders and associated files are cleared out. 

Products:

Maya;

Versions:

2014; 2015; 2016;

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