Edited version of OrbitBehavior.java

I've attached a file called MyORbitBehavior.java to this post. It makes a few minor changes to the OrbitBehavior utility class so that dragging of the mouse with the right button pressed causes the camera to translate. This use to be a feature of the class, but stopped working some time ago.

MyOrbitBehavior.java

Good job. A pull request would be better, wouldn't it?