[Unity's 2D Physics](http://docs.unity3d.com/Manual/Collider2D.html) are constrained to X and Y axes.
[Unity's Terrain](http://docs.unity3d.com/Manual/terrain-UsingTerrains.html) is oriented along X and Z axes, with the Y axis begin the "up" direction.
As Far As I Know, you can't rotate or change axes of neither of those.
This means that you can't ever use these together in a game.
Is there any way to work this around? For example, it would be great if you could make the 2D Physics Engine work on other axes - X, Z in this case.
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