I know. And crouching player hight is 0.9m, and prone 0.4m. The reason why I want to know hight of objects is so I can preset zeroing. Let's say I'm covering a friendly which is in a area of a town. If a player shows in the area I'm focusing on, I have to measure him, calculate, zero gun and then fire. By this time he might be out of sight again. But if I know the hights of objects in that area I'm focusig on, I can preset the zeroing and shoot when I first see the player. ;) Thank you very much! :)