#2 Rotation only works near coordinate centre

[Michael Braitmaier]

The rotation of the rotation manipulator only works for object in or near the centre of the worls coordinate system. In other situations the object gets transformed out of the view frustrum which causes OpenSceneGraph to crash in the TriangleIntersector.

Desirred:
- Correct rotation in all places of the world coordiante system

Current:
- Only works near or in the centre of the world coordinate centre.