Marmoset needs alpha maps to be in the diffuse map's alpha channel saved as a 32bit uncompressed TGA. Also change the blend mode of the material to "Alpha", though it seems to work with "None" as well...
So i have just been playing with marmoset, and ive made a couple of versions, but the mirroring is just too obvious. Marmoset: and in unreal: gonna give up on mirroring the normals, I have tried flipping normals, softening/hardening edges, and still nothing good. (you dont even want to see maya high quality:poly122:) these…