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You can use vtkGeometryFilter, followed by a vtkPolyDataMapper, add it to an vtkActor and display it in the renderer:<br><br><span style="font-family: Courier New,Courier,Monospace;">vtkGeometryFilter *vGeomFilter = vtkGeometryFilter::New();</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vGeomFilter->SetInput(</span><font style="font-family: Courier New,Courier,Monospace;" face="Arial" size="2"> pl3d</font><span style="font-family: Courier New,Courier,Monospace;">->GetOutput() );</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vGeomFilter->Update();</span><br style="font-family: Courier New,Courier,Monospace;"><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vtkPolyDataMapper *vContourMapper = vtkPolyDataMapper::New();</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vContourMapper->SetInput( vGeomFilter->GetOutput() );</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vContourMapper->ScalarVisibilityOff();</span><br><br><span style="font-family: Courier New,Courier,Monospace;">vtkActor *</span><span style="font-family: Courier New,Courier,Monospace;">vContourActor = vtkActor::New();</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vContourActor->SetMapper( vContourMapper );</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vContourActor->GetProperty()->SetColor(1,1,1); // white</span><br style="font-family: Courier New,Courier,Monospace;"><span style="font-family: Courier New,Courier,Monospace;">vContourActor->GetProperty()->SetOpacity(0.7); // somewhat transparent<br><br>render->AddActor( vContourActor );<br></span><br>Or something similar of course.<br><br><blockquote><hr>From: zgut@itc.pw.edu.pl<br>To: vtkusers@vtk.org<br>Date: Fri, 9 May 2008 10:38:08 +0200<br>Subject: [vtkusers] About contour VTK C++<br><br>
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<div><font face="Arial" size="2">Hi</font></div>
<div><font face="Arial" size="2">I am new user in VTK so I have problem to
solve.</font></div>
<div><font face="Arial" size="2">I am using unstructured grid data:</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2"> vtkUnstructuredGridReader *pl3d =
vtkUnstructuredGridReader::New();<br> pl3d->SetFileName(VTK_DATA_ROOT
"der.vtk");<br> pl3d->SetScalarsName("scalars");<br> pl3d->Update();</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">It's OK.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">But I would like to show only contour this
object (outside wall-cell). </font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Regards</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">Antoni</font></div>
<div><font face="Arial" size="2"><a href="mailto:zgut@itc.pw.edu.pl">zgut@itc.pw.edu.pl</a><br></font></div>
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