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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have a problem when I run the example of the Vtk screenshot at <a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/Screenshot">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/Screenshot</a>. The output image is all black!!!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>What’s wrong with my computer? Is there something wrong when I compile the Vtk?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>My platform is Windows 7 32-bit. Vs2010.Vtk 5.8.o<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>***********************the code**********************************<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>vtkConeSource*cone=vtkConeSource::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> cone->SetHeight(3.0);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> cone->SetRadius(1.0);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> cone->SetResolution(89);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> coneMapper->SetInputConnection( cone->GetOutputPort());<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkTextMapper *text= vtkTextMapper::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> text->SetInput("Shaofan Qi's Homework");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> text->GetTextProperty()->SetColor(1,1,1);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> text->GetTextProperty()->SetFontSize(24);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkActor *coneActor= vtkActor::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> coneActor->SetMapper( coneMapper );<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkActor2D *textActor = vtkActor2D::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> textActor->SetMapper(text);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> textActor->SetDisplayPosition(210,10);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkRenderer *renderer = vtkRenderer::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> renderer->AddActor( coneActor );<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> renderer->AddActor2D( textActor );<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> renderer->SetBackground(0.1,0.1,0.9);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkRenderWindow *win = vtkRenderWindow::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> win->AddRenderer(renderer);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> win->SetSize( 700,300 );<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> for (int i = 0; i < 360; i++)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> win->Render();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> renderer->GetActiveCamera()->Azimuth( 1 );<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> // Screenshot<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> if (i%90==0)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkWindowToImageFilter *imfilter = vtkWindowToImageFilter::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> imfilter->Modified();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> imfilter->SetInput(win);<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> imfilter->SetInputBufferTypeToRGB();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> imfilter->Update();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> vtkPNGWriter *writer1 = vtkPNGWriter::New();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> writer1->SetFileName("1");<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> writer1->SetInput(imfilter->GetOutput());<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> writer1->Write();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> cone->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> coneActor->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> coneMapper->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> text->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> textActor->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> win->Delete();<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>