[vtkusers] problems with saving image from window

[Martin Haidacher]

hi there.

i have a problem with saving an image from window. here is a portion of my 
code:
...
this->SetSubFrames(k+1);
this->Render();
for (int i = 0; i < k; i++)
{
// cahnge the camera viewing position
this->Render();
}
vtkWindowToImageFilter *w2i = vtkWindowToImageFilter::New();
w2i->SetInput(this);
vtkTIFFWriter *writer = vtkTIFFWriter::New();
writer->SetInput(w2i->GetOutput());
writer->SetFileName(file);
writer->Write();
this->SetSubFrames(0);
...

this code generate a correct output on the screen with all frames, but when 
i'm trying to save an image from the screen only one frame is saved in the 
image. after writing the image there is also just one frame on the screen.
my question: what can i do that i can save the image with all subframes?

thanks everybody who can help me!!!!

greetings, martin.

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