[vtkusers] How to update the renderer when the data is modified?

[Ali -]

Hi,

First of all, I think this should have been already implemented in VTK, the 
library is 10 years old! When some data is modified in the pipeline, the 
renderer does not get updated automatically.

Trying the following ends up with the error: wglMakeCurrent failed in 
MakeCurrent(). What would the right way of implementing this? All I am doing 
is displaying an image with vtkImageViewer2, and all I want is the renderer 
to get updated automatically when the image data is modified.

static void UpdateRenderer(vtkObject *vtkNotUsed( caller ),
                           unsigned long vtkNotUsed(eventId),
                           void *obj, void *)
{
  vtkImageViewer2* vw = reinterpret_cast<vtkImageViewer2*>(obj);
  vw->Render();
}

main()
{
  vtkImageImport im = vtkImageImport::New();
  // ...
  vtkImageViewer2 *viewer = vtkImageViewer2::New();
  // ...
  vtkCallbackCommand *cbc = vtkCallbackCommand::New();
  cbc->SetCallback(UpdateRenderer);
  cbc->SetClientData((void *)viewer);
  im->AddObserver(vtkCommand::RenderEvent, cbc);
  cbc->Delete();
  // ...
}

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