Optimize texture Lookup

[JohannesDeml]

Hey there,

Just took a quick look at the repo. I think you could get rid of the lerped two texture lookups by using tex2dlod instead of tex2d. There you can define your own lod/mipmap level without being bound to the uv value change from 0 to 1. The graph would look like this:

It does work without problems, but the mipmap level in the screenshot would stay the same. Maybe we could approximate the mipmap level with ddx from the world position value?