[java]bulletAppState.getPhysicsSpace().enableDebug(assetManager);
[/java]
The lines where they are most dense, that place is vacant.So, why they are showing up in the no mans land.
Seems similar to my problem: http://hub.jmonkeyengine.org/groups/physics/forum/topic/issues-with-collision-shapes
But in the end was only a visual bug, the same code in other machine (with same java version) shows a nice collision shapes.
Yeah, its happening since some change in mesh, I call the correct clear() method on the vertex buffer, maybe I have to call it on some other buffer too. In any instance its only a visual bug, yes.