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As I've heard that some version(s? all?) of Unity 3D come with PhysX as a physics engine, I assume this is going to be used. Possibly for things like collision, cloth, spells and water, maybe leaf movement, ray casting or whatever. The point is, that this physics library is very badly coded, in some older versions at least, see here: http://www.realworldtech.com/physx87/ It's a lengthy read, but the bottom line is that nVidia used to really "de-optimize" the code to run awfully bad on CPUs, not using any features of modern CPUs in terms of instruction sets (instead relying on deprecated x87) nor making any use of multiple cores. So my question is: Is this still true for the version of Unity used here, that it comes with this relic of bad software? If so, does P:E make any use of it at all? If so, would it be possible to upgrade to a more recent version of PhysX (if it has improved since), or even switch the physics engine?
