How to prevent flying/buried foliage objects?

Development World Creation
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1

Hello,

Currently I’m working on a low-poly game. I modeled some oak trees to add as foliage objects. The problem is that some of them are placed in the air/buried in the ground.

Here is a screenshot:

137032-flyingtrees.jpg
137032-flyingtrees.jpg1920×1080 740 KB

Does anyone know a solution for this, like a setting that prevents misplaced foliage? I tried searching for a solution, but I couldn’t find one. Maybe I’m blind.

Thanks in advance,

Thomas

EDIT: The objects don’t have to line up perfectly with the ground, as long as they’re touching the ground at the right angle.