Happy New Year to you all! Here is my development environment:<br><br>Windows Vista x64<br>VS 2008<br>VTK 5.6.1 x64, (compiled by myself, with Shared_Lib = ON)<br>QT 4.7.2 (LGPL, qt-win64-opensource-4.7.2-noqt3-vs2008.exe)<br>
qt-vs-addin-1.1.10.exe<br><br>
I installed and configured everything without any problems. While compiling/building VTK from source, all Qt examples under C:\VTK\VTKCode\Examples\GUI\Qt were built and run successfully. It looks like I am ready to rock.<br>

<br>From VS 2008, I created a Qt4 Project | Qt Applicaton, drag-and-dropped QVTKWidget onto QMainWindow in Qt Designer. I could build and run this simple example without any problem. However, after I added a vtkConeSource to this QVTKWidget, I could not run my compiled MyTest.exe and got an error message saying &quot;MyTest.exe has stopped working&quot;. What am I missing here? I added all LIBs to Additional Dependencies and all VTK DLLs are in PATH. I am stuck here and could not move further. Please help! Thank you.<br>
<br>I copied vtkConeSource code from qtevent example as below:<br><br>MyTest::MyTest(QWidget *parent, Qt::WFlags flags)<br>    : QMainWindow(parent, flags)<br>{<br>    ui.setupUi(this);<br><br>  // create a window to make it stereo capable and give it to QVTKWidget<br>
  vtkRenderWindow* renwin = vtkRenderWindow::New(); <br>  qvtkWidget-&gt;SetRenderWindow(renwin);<br>  renwin-&gt;Delete();<br>  <br>  const double angleSensitivity=0.02;<br>  const double translationSensitivity=0.001;<br>
  <br>  QVTKInteractor *iren=qvtkWidget-&gt;GetInteractor();<br>  vtkInteractorStyle *s=<br>    static_cast&lt;vtkInteractorStyle *&gt;(iren-&gt;GetInteractorStyle());<br>  vtkTDxInteractorStyleCamera *t=<br>    static_cast&lt;vtkTDxInteractorStyleCamera *&gt;(s-&gt;GetTDxStyle());<br>
  <br>  t-&gt;GetSettings()-&gt;SetAngleSensitivity(angleSensitivity);<br>  t-&gt;GetSettings()-&gt;SetTranslationXSensitivity(translationSensitivity);<br>  t-&gt;GetSettings()-&gt;SetTranslationYSensitivity(translationSensitivity);<br>
  t-&gt;GetSettings()-&gt;SetTranslationZSensitivity(translationSensitivity);<br><br><br>  // add a renderer<br>  Ren1 = vtkRenderer::New();  # declared in header and deleted in destructor<br>  qvtkWidget-&gt;GetRenderWindow()-&gt;AddRenderer(Ren1);<br>
  <br>  // put cone in one window<br>  vtkConeSource* cone = vtkConeSource::New();<br>  vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();<br>  mapper-&gt;SetInput(cone-&gt;GetOutput());<br>  vtkActor* actor = vtkActor::New();<br>
  actor-&gt;SetMapper(mapper);<br>  Ren1-&gt;AddViewProp(actor);<br>  actor-&gt;Delete();<br>  mapper-&gt;Delete();<br>  cone-&gt;Delete();<br>}<br><br>Thanks a lot.<br>John<br><br>