You can reload obj files format inside Moi3D but these must be "quadrangulated" and not millions polygons like a Zbrush file! (so big decimate)
then 2 methods in Moi3D
one direct direct native: Subd / Create
one by Max Smirnov : Import OBJ https://moiscript.weebly.com/_importobj.html (advantage you can regulate % of subdivision) ;)
