Ok so reading around the forums I was trying different launch parameters because I was tired of the game glitching in the distance…
So I tried -force-d3d11 as a launch parameter and it seem to get rid of all the glitching away
1.)Open steam find rust.
2.)Right Click go to Properties
3.)Click Set Launch Options
4.)Paste “-force-d3d11” without the " "
then launch the game… It seems to work for me and I played a couple hours to test it out… with grass and without grass…
Hope this helps the rest of you with the problem