[vtkusers] viewport values remains constant?

[Rakesh Patil]

Hello,Finally, after a long study, I've implemented callback functionality.. It was damn so easy and I was simply breaking my head..:)Anyways, this what I've done.class vtkMyCallback : public vtkCommand{public: static vtkMyCallback *New(){ return new vtkMyCallback; } virtual void Execute(vtkObject *callee, unsigned long, void *) { vtkRenderer *renderer = reinterpretcast(callee); computeSomething(renderer>GetActiveCamera()>GetPosition(), renderer); }};Here is a code for computeSomething()computeSomething( const double position[3], vtkRenderer *renderer){double vp[4];renderer>GetViewPort(vp);cout 
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