[vtkusers] Volume Rendering Issues - External Module

[Teek]

Hi,

So I've been using the external module to rendering cubes and spheres
successfully.
However, I'm trying to incorporate medical volume rendering from DICOM
files.
I have done so successfully in a normal VTK renderer and render window and
also a QVTKWidget.

Basically:
DICOM Image Reader > SmartVolumeMapper > Volume (Volume Property, Opacity
and Color Transfer Functions) > Render

When I use the same flow on the ExternalWidget however I get some weird
results:
<http://vtk.1045678.n5.nabble.com/file/n5743719/Normal.png>  
<http://vtk.1045678.n5.nabble.com/file/n5743719/Distortion.png> 

Essentially it looks like the volume is actually a texture mapped onto a
cube? And as I rotate, I can see the volume continuously deform to fit a
"cube shape".
Any idea why this could be? I thought maybe it was due to the opacity
transfer function, because if I disable that, I get the rendering fine. The
only issue is that without the opacity function, what I have is essentially
a cube anyway, so I can't really tell any difference.

-Teek



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