[vtkusers] VTK offscreen rendering

[kitknow]

i tried. i figured out that the segmentation fault occurs after the last line
of the following code:

	vtkVolume *volume = vtkVolume::New();
	pVolume->SetMapper(volumeMapper);
	pVolume->SetProperty(volumeProperty);
	pVolume->Update();

	vtkCamera *camera = vtkCamera::New();
	
	vtkRenderer *renderer = vtkRenderer::New();
	renderer->AddVolume(volume);
	renderer->AddActor(surfaceActor);

	vtkRenderWindow *renderWindow = vtkRenderWindow::New();
	renderWindow->AddRenderer(pRenderer);
	renderWindow->OffScreenRenderingOn();
	renderWindow->SetSize(800,600);
	renderWindow->Render();

i just don´t know wether the code is bad or the VTK settings - tried it in
Virtualbox - there it works, but in Virtualbox its not mandatory to use
Offscreen.

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