Unity tangent space creation, different from 3d max?

Hi.

I'm trying to get a normalmap on my 3d max character to work. The character is not skinned yet, it's just a plain mesh with a diffuse texture and a normalmap.

Using the diffuse bump shader, it renders like this:



In max the same normalmap renders like this:



The lighting problems in the unity render seem to happen on the uv seams of the model. Here is the
normalmap itself (downscaled for this post):



In order to figure out what the problem is, I've written a simple shader that samples the normalmap, and transforms that normal into objectspace. The result looks like this:



What it looks like to me is that the tangent space that unity generates when it imports my fbx, is not the same tangentspace that my normals are encoded in.
Unfortunattely, I don't seem to have control over what tangent space max uses, and I also don't seem to have any control over what tangent space unity uses. I'm very curious to hear if people have any ideas on how to solve this.

Thanks, Lucas