That's pretty much exactly whats going on. It renders it to a frame and then uses deferred rendering for the lighting. Static objects (i.e. terrain) are not r

That's pretty much exactly whats going on. It renders it to a frame and then uses deferred rendering for the lighting. Static objects (i.e. terrain) are not re-rendered until the camera moves, but dynamic objects (like the grass) are rendered in realtime (unless the grass animation is turned off, which I have included for weaker machines).