3D Models

[noorjan]

3D Models UV unwrapping

I have a 3D model of a sci-fi tank. I want to texture it so I apply a Unwrap UVW and then open the editor and

select the object, but when I go to mapping > flatten mapping, it is greyed out. It is like this for every object.

Also, once I have unwrapped every object in the scene what do I do then?

Thanks