I had to change the \ to / in the file path names. also the rayrc file must be edited as indicated if you didnt do that
Tried the forward slash as well. I downloaded the bunny example just to see if my PTEX file might be done wrong. I think there might be other technical subtleties that haven’t been mentioned yet. I’m simply trying to plug the mib_ptex_lookup into the color slot for the moment and get that to work before I even think about vector displacement or other more advanced stuff. Baby steps.
I’ve looked at the scarce info on MentalRay and PTex and found this http://forum.mentalimages.com/showthread.php?3980-maya-rayrc-location and this one from another thread http://forum.mentalimages.com/showthread.php?9506-bump-maps-with-mib_ptex_lookup-in-maya-2013 but again, that didn’t fix the problem.
I believe that this new way of texturing will gain great advances eventually and will be simplified as time goes by. For now, I’ll make way for the TDs to solve these issues that are way over my head.