Substance Painter displays/renders/calculates normals differently than other renderers - if it works in your target engine (marmoset) after exporting, then don't worry about the seams in painter.
it's 8 hours i am trying to fix this. The mesh is perfectly smoothed (edges) if i import the Xnormal-baked map in Marmoset, it works completely fine (first image. it get seams on 3DS MAX tangent space. if i obviouslt invert Y, it works). If i import the same thing in Substance Painter, the seams appear and he bakes them if…