Does Unity 5 use PhysX terrain?

Does Unity 5 use the PhysX heightfield / terrain class for its terrain?

 

All versions of Unity use the heightfield collider.

--Eric

 

Yes, but is the heightfield collider based on PhysX?

 

The only physics in Unity are PhysX for 3D and Box2D for 2D. If it uses 3D physics then by definition it's using PhysX.

--Eric

 

From what I've heard, it probably is. Using the terrain collider is much faster than a mesh collider so the chances of it using an equivalent physx call for the task is fairly likely. It's faster.

 

How would I go about figuring this out with absolute certainty? Experimentally?

 

It is absolutely certain. http://docs.unity3d.com/ScriptReference/TerrainCollider.html

--Eric