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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">Hi,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">I would like to visualize volume with a vtk volume rendering. With that code, there is no error but we don’t see a volume in the window, only a black
slice… Maybe I have to change the rendering mode to visualize in 3d instead of in 2d? Then, how can I choose the range of the color (intensity) I want to visualize in the window ?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">Paul
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New";color:blue">int</span><span style="font-size:10.0pt;
font-family:"Courier New""> main() {<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">typedef</span> itk::Image<<span style="color:blue">unsigned</span>
<span style="color:blue">char</span>, 3> ImageType;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">// Declare a reader<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">typedef</span> itk::ImageFileReader< ImageType > VolumeReaderType;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> VolumeReaderType::Pointer reader = VolumeReaderType::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">// Set the name of the file to read<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> reader->SetFileName(
<span style="color:#A31515">"FILTER.mhd"</span> );<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">// See if the file can be read - "try" otherwise program will<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">// mysteriously exit on failure in the Object factory<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">try</span>{reader->Update();}<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">catch</span>( ... ){<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> std::cout <<
<span style="color:#A31515">"Problems reading file format"</span> << std::endl;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">return</span> EXIT_FAILURE;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:blue">typedef</span> itk::ImageToVTKImageFilter< ImageType> ConnectorType;<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> ConnectorType::Pointer connector = ConnectorType::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> connector->SetInput( reader->GetOutput() );<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">// Add image to an vtk actor<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> vtkImageActor * imageActor = vtkImageActor::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> imageActor->SetInput(connector->GetOutput());<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">//Add that actor to the renderer<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> vtkRenderer *ren1 = vtkRenderer::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> ren1->AddActor(imageActor);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> ren1->SetBackground(0.1, 0.2, 0.4);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">//Create a render window<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> vtkRenderWindow *renWin = vtkRenderWindow::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> renWin->AddRenderer(ren1);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> renWin->SetSize(600, 600);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> ren1->ResetCamera();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> ren1->GetActiveCamera()->Zoom(1.5);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> renWin->Render();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">//Create an interactor and associate it to the render window<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> iren->SetRenderWindow(renWin);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">//Define the interacting style<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> vtkInteractorStyleTrackballCamera *style = vtkInteractorStyleTrackballCamera::New();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> iren->SetInteractorStyle(style);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New"">
<span style="color:green">//Start to interact<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> iren->Initialize();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> iren->Start();<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;
font-family:"Courier New""> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> }</span><o:p></o:p></p>
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