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

[rahul Kumar]

Hi,
add the following two lines when you change ur vtkImagedata
 pImageData->Modified();
 pImageData->GetProducerPort()->Modified();

 then pipeline will be updated automatically

rahul 



Glen Lehmann-2 wrote:
> 
> Hi Ali,
> 
> Yes, in 10 years VTK has done a great job of figuring this one out.
> Do some browsing through the Wiki or grab one of the VTK books to
> learn a bit more about the VTK pipeline.
> 
> In short, VTK is demand-driven.  You need to call Update() on your
> vtkImageData after it is modified, this will update the pipeline.
> 
> HTH,
> 
> Glen
> 
> On 02/11/06, Ali - <saveez at hotmail.com> wrote:
>> 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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