Panda Bullet

Panda Features in Development
575

The problem ist that the geom you pick from the loaded model has a transform, which you not regard when creating the collision mesh:

...
<Group> Root {
  <Transform> {
    <Matrix4> {
      1 0 0 0
      0 0 1 0
      0 1 0 0
      0 0 0 1
    }
  }
  <Group> Root1 {
...

Good luck that you .egg file only contains one geom, because you only regard the very first geom found inside the .egg file.

This is a more complete ways of creating collision meshes from models:

    np = loader.loadModel('map.egg')
    mesh = BulletTriangleMesh()
    for geomNP in np.findAllMatches('**/+GeomNode'):
      geomNode = geomNP.node()
      ts = geomNP.getTransform(np)
      for geom in geomNode.getGeoms():
        mesh.addGeom(geom, ts)
    shape = BulletTriangleMeshShape(mesh, False)
    ...

Anyway, it might be very convenient to simply create collision meshes from visible models. And Bullet and PhysX can do collision detection with triangle meshes quite fast, but I still recommend using simplified meshes for collisions.