Mesh face half dark all the time

[Rockmih]

Hello, i having this problem with some of my meshes, half of them show up what it seems to be shadow on their bottom half, i have remapped the uv channels on blender but the problem persist

this is how it looks like:

and this is how it looks like with a sky ligth intensity of 20

Ill really apreciate any help.

[Roel]

Check your vertex normals in a program like Maya or Max. Your smoothing looks incorrect.