[vtkusers] Problems with OGL crash and viewing multiple actors

[Hills David A]

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.

 

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:

 

1)       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.

2)       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.

 

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?

 

Thanks for your help

 Dave


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