I’m trying Marmoset Toolbag 4, and I’m having some geometry artifact when exporting FBX, or OBJ.
The meshes are clean, no overlapping vertexes, or bad normals. In fact, geometry looks good when imported in C4D, or Substance Painter.
This is way how to make mesh good for Marmoset in C4D with removing only critical area, not triangulate entire mesh. Sometime you have to much N-gons or they are small - hidden so best is to remove it all with one button. Usually issue when import mesh from MOI3D.
You can do it in every software of course.
btw. I don’t use Marmoset.