[vtkusers] Can VTK_QT render volumes?

[Alex Lear]

The MIP function doesn't seem to change how it looks.  I haven't tried other 
data besides my original data and this white cube I'm making here.  I can see 
it drawing the cube as it flickers when I move it.  It is definitely there.  
I have tried adjusting the opacity and color transfer functions but the 
overall visibility problem continues.  

Alex Lear


On Friday 01 November 2002 08:08 am, you wrote:
> whether if you use MIp MIP for your RayCast function, you still have same
> problem? I have similar code but that is ok.
> have you tried with other data?
>
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> -----Original Message-----
> From: Alex Lear [mailto:alear at cns.montana.edu]
> Sent: 01 November 2002 14:56
> To: Farshid Dehmeshki; vtkusers at public.kitware.com
> Subject: Re: [vtkusers] Can VTK_QT render volumes?
>
>
> 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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> > else. If you received it in error please notify us immediately and then
> > destroy it. Further, we make every effort to keep our network free from
> > viruses. However, you do need to verify that this email and any
> > attachments are free of viruses as we can take no responsibility for any
> > computer virus which might be transferred by way of this e-mail.
> >
> >
> >
> >
> > -----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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