There is a great tool to send geometry from Maya to Substance Painter, written by Victor Kam https://www.artstation.com/morepolys.
You can download it from the Allegorithmic forum:
(the maya2painter.7z file)
Also I have a duplicated, modified version of it for UDIM. This is how you can do it:
- Duplicate the original plug-in folder
- Rename it (for example: maya2painterUDIM)
- open the import.qml file with a text editor
Add this code to the end of the two alg.project.create line:
for example in my case (I changed the path):
original line: alg.project.create(“file:///d:/temp/exported.fbx”)
- Save the file
- Create two new icon for the UDIM version.