My guess is, that it is an issue with the tangent space. It looks like the normals are in general ok, they look like they point into the right direction. The shadows of the inner section are at the left and upper rim, but should be at the right and lower edge, like in the outer section. When I had a look at it in Unity (second image), you can see, that the insetted part is shaded wrong: the shadows seem to point into the wrong (opposite!) direction.

It was one face, which I gave an inset and the insetted part was turned around 180° in the UV, but uses the same part of the normal map. In the first picture, you see one side, which seems to be shaded right in 3ds Max, even if an omni light instead of default scene lighting. Here you can see an image of my test box. But as I was looking on the results in Unity, the shading of my trim sheet details were partially wrong. Now my thought was, that I could simply go into my uv1 channel, drag the uv islands on top of the trims (like I saw in every post about using trimsheets) and everything will be fine. I was making the highpoly details and baked them with xNormal on a plane which looks like that: The problem occured in the third point, my trim sheet. Here is a picture of my modules in unity: have another UV channel, with which I throw some fancy trim sheet details on my modules. are sharing atlasses for general textures and to make modules with chamfered edges & face weighted normals which My problem occured, as I made environment modules and tried to use and combine some new workflows and techniques I've learned over the last year. To give you a little background: I am a student & environment artist and currently working on an environment for a VR game in Unity.

Until now I was usually able to fix my 3D issues by myself, but on this one, I did not found a satisfying solution.

3ds max to unity