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Adding ObjectID Pass to Render Output in Maya

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(This article has a second part, with a more complete script, which you should check out later.  Read part 2 of this article ) So I was trying to find out how to generate ObjectIDs for Mental Ray renders in Maya. Peering into render passes and render layers settings, I could not find an objectId setting or preset. So I had to search the Internet for some answers. Here's a little help from Autodesk folks on how to generate object ID pass for your mental ray renders. http://knowledge.autodesk.com/support/maya/troubleshooting/caas/sfdcarticles/sfdcarticles/How-do-I-obtain-an-object-ID-pass.html Quoting from the page: -- start quote -- To obtain an object ID pass, please follow these steps: Select all the objects that you wish to include in the pass, and execute the following MEL script: addAttr -ln miLabel -at long -k 1; This will add a new attribute called “MI Label” for all the objects in the Extra Attributes section. Once you create a different MI Label for