作为合作伙伴，他们大概可以访问PhysX的特殊版本甚至源代码，从而使Unity可以直接链接到PhysX或与PhysX捆绑在一起.仅仅因为一种核心技术是以一种方式(例如最终用户运行时或nVidia驱动程序)进行分配的，并不意味着那是 only 方式.

As a partner, they presumably would have access to special builds or even source code for PhysX, allowing Unity to link in or bundle with PhysX directly. Just because a core technology is distributed one way (say the end-user run-time or nVidia drivers), doesn't mean that that's the only way.

请记住，PhysX不需要硬件加速，并且可以单独充当软件物理引擎.

Also keep in mind, PhysX doesn't require hardware acceleration and can act as a software physics engine by itself.