[Mobhack]

If you are asking "how do I ensure I am hull-down" then that's another random bit of information the game code keeps to itself, it is not really under player control.

However:
- If you are dug in then its pretty certain your vehicle will be hull down!
- If on higher terrain, then the target vehicle is more likely to be considered a hull down target

If the game thinks a target is hull-down then a very signifigant percentage of hits will be considered turret hits, the target will be slightly harder to hit, or spot if undetected etc.

But it's not like 1/300 tabletop wargaming whee you drove your vehicles to a contour line and were guaranteed to be hull-down to fire from that direction from fire from the same terrain level or lower.