NVIDIA GameWorks Integration

[anonymous_user_7c71c8ec]

@;357084

I just did some testing of the VXGI branch (internal version with 4.8.3) with Oculus DK2 (win7, runtime 0.6.0.1), and it seems to work well, except for specular tracing which I’ll try to fix.

Fixed the specular tracing bug in the internal version. No temporary workaround other than to disable specular tracing (which is too slow to use with VR in most cases anyway).