You can export an ASS file from Maya (with the XGen primitives) and then use an Arnold Procedural to load the ASS file into 3ds Max.
You need to add these two folders to the system environment variable Path:
- C:\Program Files\Autodesk\Maya2018\plug-ins\xgen\bin
- C:\Program Files\Autodesk\Maya2018\bin
For example, you can copy this:
C:\Program Files\Autodesk\Maya2018\plug-ins\xgen\bin;C:\Program Files\Autodesk\Maya2018\bin;
and paste it at the beginning of the current Path:
Restart 3ds Max after you do this.
Then add the MtoA procedurals folder to the Plugin Search Path: