Normal map glitch Maya to Max

ZelenHimihal

Hello to everyone, id like to share a problem that i encountered in hopes that someone will help me figure it out.
Its really strange and its the first time I get this.I made a character for a game and had the animator rigg it so I can do a pose and a render.He did the rigg in Maya and im using max.He gave me back the character in .fbx when he was done and after posing it I noticed this weird glitching in the shading. I think its a normals problem.Now I could easily fix the glitch by meshsmoothing or reseting/unifying/flipping normals and setting new smoothing groups however after i do that the normal seams become visible when rendering in any software(tried both max and Marmoset, same problem occurs).

Ive attached images, its really weird and I didnt find a solution on the internet.If anyone has any ideas....Please...

sulky

Hey, 

Have you tried the unify normal option form the normal modifier ? 

Either that or flipping the Y channel in Max.

Mark Dygert

So max smoothing goes fucky with imported meshes, you figured out how to fix that, so good!
Next, Maya normal maps have the green channel flipped from what max expects, there is a switch in the max normal map node to invert this for you.
 

ZelenHimihal

Hello guys, thank you for reaching out.Ive tried both options and none works.

Mark Dygert

Then your smoothing groups probably don't match the normal map when it was baked. You might have to rebake...

sprunghunt

Max also uses a different tangent basis to maya. 

poopipe

You can tell max to use Maya's tangent basis in (I think) the viewport  bit of preferences 

ZelenHimihal

Its export bug.Obj worked like a charm, but icant solve the .fbx issue. Thank you to everyone who tried to help.