I create an object in Blender, impose textures - everything is gorgeous, you can customize how to apply a texture to an object, and there are no problems with this. 
Notice how the texture lay on the roof.
Then I export this object to Unity3D. Textures are not exported, and you have to download them separately, but this is half the trouble. I have not found how to adjust the layout of the texture. The result is the following ( look at the roof ).
Instead of stretching evenly around the center, the texture is simply put on top, and I can't do anything about it.
