[vtkusers] About Updating Display

[Syed Hassan Amin]

Dear friends,
  I update camera parameters interactively using the following commarnd :
ren->GetActiveCamera()->SetPosition(txt1->value(),txt2->value(),txt3->value());
But , I am unable to figure out how to update the display automatically 
in response to change in camera parameters. Any help in this matter is 
most welcome.

Yours,

Hassan Amin