I'm importing some new models into the game, the textures show up correctly, no warnings or crashes, but I have a problem with shadows on my custom models.

Take a look at this screesnhot:

http://i41.tinypic.com/2wbxcpi.jpg

As you can see the shadow casted make it looks like the wall parts are far from the wall, but instead they are perfectly aligned on the wall and haven't any gasp on it.

Obiviously there are no polygons behind those parts, but beign aligned perfectly parallel with the wall should not cause that problem. i tried to look also to vanilla models with similar setups, but they don't have any shadow problems, on nifskope seems all good compared to vanilla models, so I'm out od ideas on how to fix this, I would avoid to put more polys behind those wall parts, as they should be uneeded.

Anyone had this issue?