[JAVA3D] please help!!!! same view in two canvasses

[Christoph Wille]

Hi   I have an application that shows two different scenes (SimpleUniverse) in two different canvasses. To move around in the scene I added to one of them an Orbit Behaviour.   I would like that also the viewing platform in the second canvas moves when I change the view in in the first canvas with the mouse. The view should be the same in both windows, however it can be changed only in one of them.   The way I'm trying to do this is to pass the ViewPlatformTransforms of the two scenes to a behaviour that is activated several times a second. In ProcessStimulus of the Behaviour the values of the first Transform are assigned to the second TransformGroup   robViewTG.getTransform(robViewT); colViewTG.setTransform(colViewT);   However, these two lines generate an java.lang.NullPointerException error. I really don't know what to do now.   Can anyone please give me a hint what he would do this?   Thanx a lot in advance   Chris