Here’s a variation of the Yeti module file that adds the bin folder to the PATH, and plug-ins to MTOA_EXTENSIONS_PATH:
+ pgYetiMaya any C:\solidangle\yeti\Yeti-v1.3.14_Maya2014-windows64 PATH +:= bin MTOA_EXTENSIONS_PATH +:= plug-ins
MtoA uses MTOA_EXTENSIONS_PATH to find the Yeti extension for MtoA, and Arnold uses PATH to find the Yeti procedural.
After a few tries, I got one mtoa.mod file that works for multiple Maya versions:
+ MAYAVERSION:2015 mtoa any C:\solidangle\mtoadeploy\2015 PATH +:= bin + MAYAVERSION:2014 mtoa any C:\solidangle\mtoadeploy\2014 PATH +:= bin + MAYAVERSION:2013 mtoa any C:\solidangle\mtoadeploy\2013 PATH +:= bin
I had to repeat the PATH line for each module, otherwise the bin folder wasn’t added to the PATH.
I just had to set MAYA_MODULE_PATH to point to this mtoa.mod file, and then I could load MtoA in Maya 2013, 2014, and 2015.
This could be useful if you have multiple users sharing a single machine, because with this mtoa.mod, you don’t have to worry about putting version-specific mtoa.mod files in every user’s Maya folder (by default, the MtoA installer puts mtoa.mod in the user’s $MAYA_APP_DIR\\modules\\<version> folders).
Another way to do it would to be put the mtoa.mod files in the default shared modules folders. For example, on Windows:
C:\Program Files\Common Files\Autodesk Shared\Modules\Maya\2013 C:\Program Files\Common Files\Autodesk Shared\Modules\Maya\2014 C:\Program Files\Common Files\Autodesk Shared\Modules\Maya\2015
On Linux:
/usr/autodesk/modules/maya/<version>
On Mac OS X:
/Users/Shared/Autodesk/maya/<version> for MacOS
So, let’s say you’ve got a “32-core workstation with 4 Xeon processors.” What version of Windows should you get?
To answer that question, you need to understand how the different Windows editions support processors.
From Microsoft, here’s some information about Windows licenses and multiple processors:
PCs with multiple processors (CPUs):
Commercial servers, workstations, and other high-end PCs may have more than one physical processor. Windows 7 Professional, Enterprise, and Ultimate allow for two physical processors, providing the best performance on these computers. Windows 7 Starter, Home Basic, and Home Premium will recognize only one physical processor.
The number of licenses you will need depends on the number of physical processors on the server and the number of server instances that you will be running. (This only applies for Standard edition because Datacenter edition allows for unlimited VMs.) The larger of these two numbers determines the number of total licenses required.
Determining the number of physical processor licenses
Each license covers up to two physical processors, so to determine the number of licenses needed to
fully license a physical server, simply count the number of physical processors in the server, divide that number by two and that tells you the number of licenses that will be needed.
Here are some examples:
Here’s some more reading about Windows Server, licensing, and multiple processors:
Arnold Support Corner 