| The following setup will get your multi region UV maps into Nuke. (Click to view full size). You can also right-click here to download the Nuke file
Mari uses the UDIM method for UVs, as opposed to Mudbox. Nuke assumes you are working in UDIM but can do both (the above method is set up for Mudbox.
Reading multi-region UV maps in Vray
Vray can read in Mari's UDIM format with the code <UDIM> so:
textures/myTexture_der_v1_<UDIM>.png
gives you this:
textures/myTexture_der_v1_1001.png
The Mudbox style is somewhat confusing to read with the version number:
textures/myTexture_der_v01_<UVTILE>.png
gives you this:
textures/myTexture_der_v01_u1_v1.png
This chart illustrates both in UV space (image credit: Ben Neall):
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