<div dir="ltr">renderer->ResetCameraClippingRange()  maybe? That and camera->OrthogonalizeViewUp() are the two common things to try when manual camera changes do not work.<div><br></div><div>Thanks</div><div>Ken</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 17, 2015 at 2:15 PM, Gib Bogle <span dir="ltr"><<a href="mailto:g.bogle@auckland.ac.nz" target="_blank">g.bogle@auckland.ac.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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<div style="direction:ltr;font-family:Tahoma;color:#000000;font-size:10pt"><font size="3" face="Arial">I have now established conclusively that adjusting the camera setup with SetPosition and SetFocalPoint stops the scene from being displayed, while any
 movement of the mouse with a button down restores display.<br>
<br>
<span style="color:#c0c0c0"></span><font face="Courier New"><span style="color:#800000">qvtkWidget</span><span style="color:#c0c0c0">
</span><span style="color:#000000">=</span><span style="color:#c0c0c0"> </span>
<span style="color:#808000">new</span><span style="color:#c0c0c0"> </span><span style="color:#800080">QVTKWidget</span><span style="color:#000000">(</span><span style="color:#000000">page</span><span style="color:#000000">,</span><span style="color:#800080">QFlag</span><span style="color:#000000">(</span><span style="color:#000080">0</span><span style="color:#000000">));</span></font></font>
<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800000"><span style="color:#800080">QVBoxLayout</span><span style="color:#c0c0c0"> </span><span style="color:#000000">*</span><span style="color:#000000">layout</span><span style="color:#c0c0c0"> </span><span style="color:#000000">=</span><span style="color:#c0c0c0"> </span><span style="color:#808000">new</span><span style="color:#c0c0c0"> </span><span style="color:#800080">QVBoxLayout</span><span style="color:#000000">;</span>
l<span style="color:#000000">ayout</span><span style="color:#000000">-></span>addWidget<span style="color:#000000">(</span><span style="color:#800000">qvtkWidget</span><span style="color:#000000">);</span>
</span></font><span style="color:#c0c0c0"></span><span style="color:#800000">page_VTK</span><span style="color:#000000">-></span>setLayout<span style="color:#000000">(</span><span style="color:#000000">layout</span><span style="color:#000000">);</span>
<font size="3" face="Courier New"><span style="color:#800000">ren</span><span style="color:#c0c0c0"> </span><span style="color:#000000">=</span><span style="color:#c0c0c0"> </span><span style="color:#800080">vtkRenderer</span><span style="color:#000000">::</span>New<span style="color:#000000">();</span><span style="color:#c0c0c0">     </span></font></pre>
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<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800000">renWin</span><span style="color:#c0c0c0"> </span><span style="color:#000000">=</span><span style="color:#c0c0c0"> </span><span style="color:#800000">qvtkWidget</span><span style="color:#000000">-></span><span style="font-style:italic;color:#000000">GetRenderWindow</span><span style="color:#000000">();</span></font></pre>
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<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800000">renWin</span><span style="color:#000000">-></span><span style="font-style:italic;color:#000000">AddRenderer</span><span style="color:#000000">(</span><span style="color:#800000">ren</span><span style="color:#000000">);</span></font></pre>
<font size="3" face="Courier New"><span style="color:#c0c0c0"></span><span style="color:#800000">ren</span><span style="color:#000000">-></span>ResetCamera<span style="color:#000000">();</span><span style="color:#c0c0c0">
</span><span style="color:#800000"><br>
iren</span><span style="color:#c0c0c0"> </span><span style="color:#000000">=</span><span style="color:#c0c0c0">
</span><span style="color:#800000">qvtkWidget</span><span style="color:#000000">-></span><span style="font-style:italic;color:#000000">GetInteractor</span><span style="color:#000000">();</span>
</font>
<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800080">vtkSmartPointer</span><span style="color:#000000"><</span><span style="color:#800080">MouseInteractorStyle4</span><span style="color:#000000">></span><span style="color:#c0c0c0"> </span><span style="color:#000000">style</span><span style="color:#c0c0c0"> </span><span style="color:#000000">=</span><span style="color:#c0c0c0"> </span><span style="color:#800080">vtkSmartPointer</span><span style="color:#000000"><</span><span style="color:#800080">MouseInteractorStyle4</span><span style="color:#000000">>::</span>New<span style="color:#000000">();</span></font></pre>
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<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800000">iren</span><span style="color:#000000">-></span><span style="font-style:italic;color:#000000">SetInteractorStyle</span><span style="color:#000000">(</span><span style="color:#c0c0c0"> </span><span style="color:#000000">style</span><span style="color:#c0c0c0"> </span><span style="color:#000000">);</span></font></pre>
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<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3" face="Courier New"><span style="color:#800000">iren</span><span style="color:#000000">-></span><span style="font-style:italic;color:#000000">Initialize</span><span style="color:#000000">();</span></font></pre>
<font size="3" face="Courier New"></font>
<pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3"><font face="Courier New"><span style="color:#800000">ren</span><span style="color:#000000">-></span>GetActiveCamera<span style="color:#000000">()-></span>SetPosition<span style="color:#000000">(</span><span style="color:#000080">0</span><span style="color:#000000">,</span><span style="color:#c0c0c0"> </span><span style="color:#000080">0</span><span style="color:#000000">,</span><span style="color:#c0c0c0"> </span><span style="color:#000080">0</span><span style="color:#000000">);</span>
<span style="color:#c0c0c0"></span><span style="color:#800000">ren</span><span style="color:#000000">-></span>GetActiveCamera<span style="color:#000000">()-></span>SetFocalPoint<span style="color:#000000">(</span><span style="color:#000000">x0</span><span style="color:#000000">,</span><span style="color:#c0c0c0"> </span><span style="color:#000000">x0</span><span style="color:#000000">,</span><span style="color:#c0c0c0"> </span><span style="color:#000000">x0</span><span style="color:#000000">);</span></font>
</font><pre style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><font size="3"><br></font></pre></pre>
<font size="3" face="Arial">If I remove the last two lines the scene is centred OK, but not at the scale I want.  I can play with Zoom(), but SetFocalPoint(x0,x0,x0) ensures that I get the desired scaling directly.<br>
Is this the expected behaviour?  I'm wondering if it is the result of using the QVTKWidget "default" camera instead of creating a new one to use (please excuse deficiencies in my understanding).  Is Zoom() the only way to achieve what I want?</font><br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Ken Martin PhD<div>Chairman & CFO<br>Kitware Inc.<br>28 Corporate Drive<br>Clifton Park NY 12065<br>518 371 3971<div><br></div><div><span style="font-size:10pt;font-family:Tahoma,sans-serif">This communication,
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