<div dir="ltr">(Sorry for last email without a subject line)<br><br><div>I want to display a PNG image thru vtkImageActor and 
vtkInteractorStyleImage on QVTKWidget. Everything works fine except the 
image appears too small. How do I make the image appears larger when I 
show it the first time without mouse interaction? I tried Dolly but no 
effect at all. Someone please recommend a camera function to enlarge the
 image? Here is my code<br>
<br>  vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>:<div>:New();<br><br>  QString path = QCoreApplication::applicationDirPath();<br>  path.append("/icons/logo.png");  <br>  reader->SetFileName((path.toStdString()).c_str());<br>

<br>  vtkSmartPointer<vtkImageActor> imgactor = vtkSmartPointer<vtkImageActor>::New();<br>  imgactor->SetInput(reader->GetOutput());<br><br>  vtkSmartPointer<vtkInteractorStyleImage> isi = <br>    vtkSmartPointer<vtkInteractorStyleImage>::New();<br>

  gUI.qvtkWidget->GetRenderWindow()->GetInteractor()->SetInteractorStyle(isi);<br><br>  // a renderer and render window<br>  vtkRenderer *ren1 = vtkRenderer::New();<br>  gUI.qvtkWidget->GetRenderWindow()->AddRenderer(ren1);<br>

<br>  // add the actor to the scene<br>  ren1->AddViewProp(imgactor);<br>  ren1->SetBackground(1,1,1);     // Background color<br><br>  ren1->GetActiveCamera()->Dolly(1.0);<br><br><br>Thank you!<br><br></div>
<div>John<br></div></div></div>