Collider with cinema 4D

Unity Engine
1

Hello,
I have a problem with sphere collider.

The attached image is a c4d mesh file

I created box for box collider and sphere, for the center, for sphere collider.
When shield fell down, if i use the sphere mesh created with cinema 4d, for sphere collider, don’t work very well on movement.
If i use unity5 sphere collider the physic work very well and all movement are fluid.

Is possible recreate same sphere collider in cinema 4d or need only create collider in unity 5 editor for have a good physic movement?

Thanks for yours time.

2

Edit:
I tried with unity 5 terrain and c4d landscape mesh.
The problem is the unity 5 terrain!

If i check in unity (generate collider and convex in mesh collider), on c4d landscape mesh, the physic work in right way.
If i check same things, but use unity 5 terrain, the physic work very bad!

Anyone can explain me why have this?