I am on a Mac, and use mental ray for Maya. But…

Hello Mac users,

you love to stay on your Mac and use mental ray for Maya?

No problem, since Maya offers the same Qt user interface and experience like on Windows or Linux. Maya scene files and mental ray .mi files that have been generated on other platforms can simply be used on the Mac. Even the configuration files, “Maya.env” and “maya.rayrc”, work identically. All true, but…

Several things are different. For example, the unique use of Mac specific keyboard shortcuts is puzzling, like in the “open scene” window. Switching to the “OS native” file dialog is possible in the Maya preferences. Although it might even be more confusing to use Qt and non-Qt side by side.

What about mental ray ? Well, it is only dependent on the underlying Unix basis “Darwin” with its stable and standardized interfaces. That keeps it quite independent from frequent Mac OS X updates, which typically just touch the application levels of the operating system.

Normally. But the most recent “Mavericks” update of OS X, version 10.9, seem to have changed some multi-threading behavior of the kernel. mental ray is obviously also affected, and shows unexpected interruptions, or even gets blocked completely during rendering. Our developers are currently diving into it, to come up with a solution as soon as possible.

Here is another little annoyance:

The message log for mental ray preview rendering has disappeared a few Mac OS X versions back, also due to a system change that handles console output. The batch rendering is not affected since it writes the messages to a file. There is a workaround for preview rendering, though, using mental ray for Maya’s built-in log facility that works separately to the system log. It can be enabled on the Maya command line like this (also useful for a Shelf button):

Mayatomr -preview -log

It will create a file with the fixed name “mentalray.log”, typically residing in the last opened scene file directory. Double-clicking on the file in the Mac Finder will open the Console App, giving a similar experience to the message display on other platforms. If you enable the Console preference “bring log window to front” it will pop up automatically with each mental ray rendering of that scene using the -log command.

mental ray messages
mental ray for Maya log messages

Happy rendering!

3 thoughts on “I am on a Mac, and use mental ray for Maya. But…

  1. Awesome and helpful post, thanks! Is there any way to subscribe to any updates on possible fixes for the Mavericks kernel multi-threading idiosyncratic behaviors? Or possible partake as a beta tester? Thank you!

  2. nvsteffen says:

    The latest Maya 2015 Service Pack 4 should fix the hangs and potential crashes on Mac OS X Mavericks. Please let us know if it resolves the problems for you.

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