Walking through trees

I searched for this on this forum and found several ways how to achieve this:
- Locust - impossible for me, I need the unit to be playable by player
- Collision off - does not accept cliffs and has problems with pathfinding
- and finally - Flying - It seems ideal for me. I can sacrifice flying for it and I have already put Air blockers all over the cliffs. But I still cannot force the unit to walk on ground I selected dryad and changed its movement type to Flying. But she began to really fly over the ground, when I set Flying height to -120 she was sometimes OK, but sometimes she was still above ground and sometimes she was half body underground

"when I set Flying height to -120 she was sometimes OK"

Did you set Max Height and Min Height too?

I set both to -120. But I don't see any sense in it - when both were on zero she was flying several ingame feet over ground :(

That's because the game engine dynamically adjusts fly height depending on the terrain below when passing over cliffs, trees ect, a flying unit can never really be on the ground.

Hmm, is here any other way how to make unit walk through trees?

Uhm, what do you mean with "does not accept cliffs"?Units with
can walk freely over cliffs, trees, other units etc... The only problem is that you have to "manually" (by clicking many times) order them to pass over cliffs.

But I don't want them to walk over cliffs :(

Replace the trees with a dummy unit w/ the appropriate models and no collision.

Hmm.
Does collision stop pathing blockers? Because if they still get stopped when collision is off, just replace all the air blockers with ground blockers and turn off collision.

VNXcrytic: I need to give this ability only to a single unit / max. several units
Tide: I tried it (see attached map) and unit with col. off can walk through everything (if you spam your orders enough). even both blocker don't stop it.