I designed I room in Blenderwhich has complexwalls and stuff and import it viacolladato jME as Node.
When I want toget physics in thereis generates a box around the room and shoots everything inthere out.
The first idea which came to my mind was would'nt it be nice to have boolean operations on the physical bounds ?
Merge is there for addition but a difference ioeration would be nice or can I somehow create a Boudning Volume from a Node which carries alot of trimeshes?
Boolean operations would be nice, yes. But at least ODE does not support such collision geometries. And I have not heard of any physics engine that does.
You should approximate your meshes with primitives instead. You can also use your room as trimesh collision geometry.