Hi gui, so you mean you are doing the booleans inside of photoshop on the imported mesh objects?

I'm not sure that you can expect very much from Photoshop's boolean functions, it's just not a major focus area for them. I didn't even know that they had any boolean functions in there at all.

The setting I mentioned before "Output: Quads & Triangles" may help though, I would recommend giving that a try to see if that helps.

But you would probably be better off doing the boolean in MoI and then export the already booleaned result to a mesh, rather than trying to do booleans on the meshes later on in a polygon modeling program.

- Michael