[vtkusers] About the screenshot

[Shaofan]

Hi,

I have a problem when I run the example of the Vtk screenshot at
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/Screenshot. The output
image is all black!!!

What's wrong with my computer? Is there something wrong when I compile the
Vtk?

My platform is Windows 7 32-bit. Vs2010.Vtk 5.8.o

 

***********************the code**********************************

vtkConeSource*cone=vtkConeSource::New();

         cone->SetHeight(3.0);

         cone->SetRadius(1.0);

         cone->SetResolution(89);

         

         

         

         vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();

         coneMapper->SetInputConnection( cone->GetOutputPort());

 

         vtkTextMapper *text= vtkTextMapper::New();

         text->SetInput("Shaofan Qi's Homework");

         text->GetTextProperty()->SetColor(1,1,1);

         text->GetTextProperty()->SetFontSize(24);

 

 

         vtkActor *coneActor= vtkActor::New();

         coneActor->SetMapper( coneMapper );

 

         vtkActor2D *textActor = vtkActor2D::New();

         textActor->SetMapper(text);

         textActor->SetDisplayPosition(210,10);

 

         vtkRenderer *renderer = vtkRenderer::New();

         renderer->AddActor( coneActor );

         renderer->AddActor2D( textActor );

         renderer->SetBackground(0.1,0.1,0.9);

 

         vtkRenderWindow *win = vtkRenderWindow::New();

         win->AddRenderer(renderer);

         win->SetSize( 700,300 );

 

 

         for (int i = 0; i < 360; i++)

         {

                   win->Render();

                   renderer->GetActiveCamera()->Azimuth( 1 );

                   

                   // Screenshot

                   

                   if (i%90==0)

                   {

                            vtkWindowToImageFilter *imfilter =
vtkWindowToImageFilter::New();

                            imfilter->Modified();

                            imfilter->SetInput(win);

                            imfilter->SetInputBufferTypeToRGB();

                            imfilter->Update();

 

                            vtkPNGWriter *writer1 = vtkPNGWriter::New();

                            writer1->SetFileName("1");

                            writer1->SetInput(imfilter->GetOutput());

                            writer1->Write();

                   }

                   

         }

         cone->Delete();

         coneActor->Delete();

         coneMapper->Delete();

         text->Delete();

         textActor->Delete();

         win->Delete();

 

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