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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m new to VTK so forgive me if I’m being really
stupid with anything. I also couldn’t find any rules or guides about
posting to this list so, again, sorry if I annoy anyone.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m writing a GUI using visual studio and Qt. I’m
trying to use vtk to show some elements entered in the GUI. They are basically
lines and boxes. I’m having two problems:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>The Qt
widget that I open (as a modal dialog) with vtk window in it opens fine with a cylinder
displayed in it (like in the example qt code) but the app crashes whenever I
regain focus (like if I switch between windows). An assert is failing here:
COpenGLControls::BeginOpenGLDrawing(): ASSERT(!m_hDC==!m_CountBeginEnd). M_hDC
is a NULL pointer and m_CountBeginEnd is 1. I’ve no idea what this is
about. The window that my modal dialog gets opened from also has so OpenGL
widgets in it (perhaps this is related) although these are just hand coded OGL.<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I’m
having trouble displaying more than one actor. I’m representing each “line”
in my GUI using a vtkLineSource ->vtkPolyDataMapper -> vtkActor ->
vtkRenderer. When I try to add several of these lines (instantiating new lines
and mappers and actors of course) I only see the last of them in the display. Any
idea what I’m going wrong? I switch on immediate mode rendering for the
mappers if that’s important. I’m also calling ResSetCamera on the
renderer but other than that, I just connect them all up.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I do all of the setup in the widget’s constructor. Do
I need to do something with an OnDraw function or anything like that?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks for your help<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Dave</span></font><o:p></o:p></p>
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