[vtkusers] Can VTK_QT render volumes?

[Alex Lear]

Hello,
I have been able to render a volume but it doesn't really show up.  When I 
move the volume in 3D (rotate, zoom, etc.) it flickers and I can see the 
volume but it disappears.  I have reduced the code to a small section 
included below that produces a solid cube volume and I have posted a 
screenshot of the renderwindow here: 
http://www.attackforums.com/Sample_Volume_Render.jpg

Also, I have a dual P4 computer running Redhat 7.2 with an nVidia Quadro2 
graphics card.  The openGL driver is installed.  Could this be graphics card 
related?

Any ideas of why it doesn't show up are greatly appreciated!
Thanks,

Alex Lear

BEGINNING OF CODE

//******************************************************************************************
int i;

vtkStructuredPoints *sPoints = vtkStructuredPoints::New();
sPoints->SetDimensions(100,100,100);

vtkFloatArray *Scalars = vtkFloatArray::New();
for (i=0;i<1000000;i++)
      {
     Scalars->InsertNextValue(1.0);
      }
sPoints->GetPointData()->SetScalars(Scalars);
Scalars->Delete();

vtkVolumeRayCastCompositeFunction *densitycompositeFunction = 
vtkVolumeRayCastCompositeFunction::New();
 
vtkVolumeRayCastMapper *densityvolumeMapper = vtkVolumeRayCastMapper::New();
    densityvolumeMapper->SetInput(sPoints);
    densityvolumeMapper->SetVolumeRayCastFunction(densitycompositeFunction);

vtkVolume *densityvolume = vtkVolume::New();
    densityvolume->SetMapper(densityvolumeMapper);

ren1->AddVolume(densityvolume);
//Render
RenderWidget1->GetRenderWindow1()->Render();
//******************************************************************************************

END OF CODE



On Thursday 31 October 2002 10:56 am, you wrote:
> Hi
> of course it can
> how do you use it?
>
>
>
>
>
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> -----Original Message-----
> From: Alex Lear [mailto:alear at cns.montana.edu]
> Sent: 31 October 2002 17:30
> To: vtkusers at public.kitware.com
> Subject: [vtkusers] Can VTK_QT render volumes?
>
>
> I would like to know if VTK_QT can render volumes?  I am trying to render a
> volume and I am getting a segmentation error when I call the render()
> function.
>
> Thanks,
> Alex Lear
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