Adding OrbitBehavior in a VirtualUniverse (or how to get a ViewingPlatform)

Question

I know how to add OrbitBehavior given a SimpleUniverse (get the ViewingPlatform and add to that using setViewPlatformBehavior) but in a VirtualUniverse, you cannot get the ViewingPlatform...at least not like you can from a SimpleUniverse.
So, how do you set the view platform behavior without a ViewingPlatform? Or, how can you get a ViewingPlatform in a VirtualUniverse?
THANKS!

Answer 1

I have done it as follows, sorry I can't put some comments,
I don't have time now :
view = new View();
view.setBackClipDistance(2000.0);
cam_tx_group = new TransformGroup(); // camera transform group
camplatform = new ViewPlatform(); // View platform
location = new Transform3D();
view.addCanvas3D(canvas);
view.setPhysicalBody(new PhysicalBody());
view.setPhysicalEnvironment(new PhysicalEnvironment());
cam_tx_group.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
cam_tx_group.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
cam_tx_group.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND );
location.setTranslation (loc); // loc is a "starting point"
cam_tx_group.setTransform(location);
viewingPlatform = new ViewingPlatform(); // for orbit behavior
viewingPlatform.setViewPlatform(camplatform);//orbit behavior
cam_tx_group.addChild(viewingPlatform);// orbit behavior
view.attachViewPlatform(camplatform);
======= and to add the OrbitBehavior ============
     orbit = new OrbitBehavior(aCanvas, OrbitBehavior.REVERSE_ALL);
orbit.setCapability(OrbitBehavior.ALLOW_LOCAL_TO_VWORLD_READ );
BoundingSphere allBounds =
     new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
orbit.setSchedulingBounds(allBounds);
orbit.setEnable(true);
orbit.setHomeTransform(location);
viewingPlatform.setViewPlatformBehavior(orbit);
// here you could type : orbit.setRotationCenter("a point3d");
========================================================
You 'll have some problems if you want to "put" the Viewpoint
to a given location in code ,
cam_tx_group.setTransform(t3d2); // the t3d2 is the target
location.setIdentity() ; // set location Transform3D to "default"
orbit.setHomeTransform(location);
orbit.goHome() ;
the last 3 lines make sure that the viewpoint goes to the correct
position.
If you find a better way for the last 3 lines, please post it :)