Improvements for Planar reflections.

[anonymous_user_fbe2d247]

@Spoondog

Nice work - I have a planar reflection in use almost 100% of the time in my game so any optimisations like these are always welcomed if Epic will approve them. Not sure it will help lots in my case (not a lot of occlusion culling happening, and I don’t use prefiltering), but when you’re going for 60FPS, every fraction of a ms is useful!

How big you planar reflection actors are? Biggest improvement is when actor isn’t covering whole screen.