About grass and soldiers hiding in the grass:
The problem are mipmaps - textures have lower resolution when settings are low, you see polygon at an angle, or in the distance.
Generally they get more and more blurry.
So when youre hiding in the grass and someone else looks at you - even if grass covers half of body (just like it happens in A2) - you are still realy easy to see as you're only sharp object in blurry environment.
That's crap solution, it's still really easy to pick sodiers "hiding" in the grass, even if only head is visible.
Sharp on blurry is easy to see - blurry on blurry would be harder to notice.
So soldiers in ARMA3 need to be blurred when they are far away or prone.
This can be done by having different shader for last LOD of characters, even vehicles.
Different camuflages could give more or less blurrines.
Shooting and giving away your position (moving etc.) could sharpen your character, making it easier to notice.
---------- Post added at 03:20 PM ---------- Previous post was at 03:19 PM ----------
Here is example (i could not paste it into my first post:)
http://lh4.googleusercontent.com/-VUa4hUk5ivQ/T4Q_gTBOfUI/AAAAAAAAFH4/dO74PfxurrQ/s882/arma%2520zoom.jpg