Yeah, I'm aware. Thanks. I will try different methods.
- Merge in UE with build in functionality
- Merge in UE with an own geometry scripting tool
- Try to use the old "compute visibility" route generating a grid (should be still in the engine for mobile)
- trick the occlusion algorithm in UE to be more loose
- and last resprt would be going through the huge maps by hand and make groups (it's not Hammer but NetRadiant for ET