Are you sure you have meshed the outsides of your surfaces and not the insides? Try flipping your triangles around by inverting the node order (flip two of the vertex indices for each of the triangles) and see if that helps. I'm sure your meshing tool should have a function for that.
When im home from work i will give that a try! thanks Sir!
---------- Post added at 06:53 AM ---------- Previous post was at 06:51 AM ----------
As SolarLiner said try to recalculate normals. You just have to do it for every single mesh group. Select group "TAB" to go to edit mode then "ctrl + N" to recalculate then repeat the process. Btw that model is hi-poly it's almost 850k triangles, that's good for offline rendering or baking AO's or normal maps but is an overkill for a ingame mesh.
ive managed to obtain the Same Mesh but it only has 1 group which is the whole mesh... and when i do that with the Recalculate Normals on that one single group it still gives me the shadow on the sunny side.. (im really new to meshing and im learning by every step i take so forgive me for not understanding some things you guys are telling me to do!)
---------- Post added at 07:24 AM ---------- Previous post was at 06:53 AM ----------
In case you didn't know, for 'recalculate normals' and 'flip normals' to work, you have to be in edit mode and have some/all faces selected.
you can only see Recalculate Normals in edit mode right? because i found it, also when i flip my normals it looks like i can see through half of my ship so flipping wont make things better i guess