Rotate.Around() doesn't work with terrain?

I have placed a camera to 0,0,0.
It has a simple script attached : Update
scene.transform.RotateAround ( camPosition,Vector3.up, 10.0F * Time.deltaTime)

If scene is a mesh like the built-in plane and if I move the camera in runtime the mesh rotate properly around the new position of the cam, but if scene is a Terrain the terrain rotate in different mode not around the camera. What is wrong?

My problem is to create a scene with a fixed camera translating and rotating the scene around the camera.
With a mesh it works fine and I can do all the translations and rotations, with a terrain I can do only translation.
Thanks

 

Terrains can't be rotated.

--Eric

 

Thanks Eric, I don't find a good solution to solve my problem. I could use a mesh to represent the terrain but I love the terrain module of unity... Why the terrain can't rotate, what is the reason and what is the impediment.

 

The terrain isn't a mesh, it's generated dynamically at runtime, and not allowing rotation allows various optimizations, both with the generated terrain and the terrain collider.

--Eric

 

Thanks, you are precious !