[vtkusers] how to reset input to a writer?

[Jesse Neri]

And the answer is to send the Modified command to the
WindowToImageFilter before each call of Write to the Writer.
As in:

  this->wif->Modified();
  
before the

  this->bmpWriter->Write();


--
Jess Neri   neri at hobbes.nrl.navy.mil   (202) 404-4365 
Pulsed Power Physics Branch, Plasma Physics Division  
Naval Research Laboratory, Washington DC   20375      


> -----Original Message-----
> From: vtkusers-admin at public.kitware.com
> [mailto:vtkusers-admin at public.kitware.com]On Behalf Of Dean Inglis
> Sent: Wednesday, July 10, 2002 11:23 AM
> To: vtkusers
> Subject: [vtkusers] how to reset input to a writer?
> 
> 
> Hi,
> 
> I tried this question last month without success and now it 
> has come up
> again.
> I'm building movie frame generator functionality into an (not 
> available yet)
> interactor event recorder that writes the playback of 
> previously recorded
> events to a numbered sequence of bitmap images.  The pipeline 
> consists of:
> 
> vtkWindowToImageFilter wif
> vtkBMPWriter bmpWriter
> 
> The interactor event recorder (this) owns the wif and the 
> bmpWriter and a
> reference to a vtkRenderWindowInteractor:
> 
> Prior to start of the playback loop:
>     if ( this->RecordMovie )
>       {
>       
> this->wif->SetInput((vtkWindow*)this->Interactor->GetRenderWindow());
>       this->FrameNumber = 0;
>       }
> 
> within the playback loop:
> 
>  while ( reading_events_from_a_file )
>    {
>    get_event_info_from_file();
>    make_interactor_invoke_event();
>    if (this_is_a_movie_recordable_event)
>      {
>      this->bmpWriter->SetInput(this->wif->GetOutput());
>      char* name = create_a_movie_file_name(this->FrameNumber);
>      this->bmpWriter->SetFileName(name);
>      this->bmpWriter->Write();
>      delete [] name;
>      this->FrameNumber++;
>      }
>    }
> 
> The problem is that the images are all the same: bmpWriter 
> doesn't change
> its input.
> How do I 'reset' the bmpWriter/wif pair to update?
> 
> Dean
> 
> 
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