What does AMD video cards have that competes w/ Nvidia's PhysX?

In terms of environment detail that the physx offer, what similar feature does amd have? Thanks!|||AMD never implemented anything like that in their GPU hardware. Nowadays many games do those sorts of terrain physics via the processor, not the graphics card.|||There is Havok and a few other lesser known systems, but Nvidia's PhysX is the winner in every category for the few games it is supported by.