negativ flyheight via functions?

It seems I can't use "SetUnitFlyHeight" to set a units flyheight to less than 0. I tried setting flyheight and minimum flyheight to -1000 and making my unit a flyer as well as using the flytrick - no use.

It's supposed to be a bullet and fly through smal hills instead of going above (which looks stupid).

So the question is: Is there a way to set the flyheight to negative values ingame?

Thx

I heard that even when you accomplish the negative flying height it causes desyncs.

You could just hide the bullet while it is travelling through the small hills and then show it again

So that means there's no "easy" way, is there.
Then I'm going to make hills and stuff stop the projectile. The problem is that it looks strange for small "terrain unevennesses" to stop a bullet but even worse if the bullet "hops" over it...
Maybe I'll just have to be carefull while creating the terrain - thx anyway!

But is there any way to change height to below 0 in game? (besides creating a new unit with base height below 0)

No.

No, you can't.

Actually there is.

Make the entire terrain a custom model that is walkable ^^