[Paraview] volume vs. surface

[Natalie Happenhofer]

 Hi!
 Here is a backtrace of the error I´m encountering:

 Program received signal SIGSEGV, Segmentation fault.
 [Switching to Thread 0x7f9bea407750 (LWP 12368)]
 0x00007f9be47275cc in
 vtkFixedPointCompositeHelperGenerateImageOneTrilin<float> ()
    from
 /home/happenhofer/Paraview/build-svn/bin/libvtkVolumeRendering.so.pv3.4
 (gdb) back
 #0  0x00007f9be47275cc in
 vtkFixedPointCompositeHelperGenerateImageOneTrilin<float> ()
    from
 /home/happenhofer/Paraview/build-svn/bin/libvtkVolumeRendering.so.pv3.4
 #1  0x00007f9be46f9909 in
 vtkFixedPointVolumeRayCastCompositeHelper::GenerateImage ()
    from
 /home/happenhofer/Paraview/build-svn/bin/libvtkVolumeRendering.so.pv3.4
 #2  0x00007f9be4803577 in FixedPointVolumeRayCastMapper_CastRays () from
 /home/happenhofer/Paraview/build-svn/bin/libvtkVolumeRendering.so.pv3.4
 #3  0x00007f9bdcfd0e54 in vtkMultiThreader::SingleMethodExecute () from
 /home/happenhofer/Paraview/build-svn/bin/libvtkCommon.so.pv3.4

 As I said, this is just occurring when I use the Gradient filter.

 Do you have any idea what´s going wrong?

 thx,
 Natalie

> Date: Mon, 9 Mar 2009 14:07:49 -0400
> Subject: Re: [Paraview] volume vs. surface
> From: dave.demarle at kitware.com
> To: nataliehapp at hotmail.com
> CC: paraview at paraview.org
> 
> Volume Rendering uses opacity to let you see through and inside the
> data. Surface just shows the outermost surface. Volume rendering is
> more compute intensive and thus often slower to render.
> 
> The two usually look very different.
> 
> I would have to have more details, like a stack trace or at least
> error output to hazard as guess as to why it might be segfaulting for
> you.
> 
> 
> On Mon, Mar 9, 2009 at 2:03 PM, Natalie Happenhofer
> <nataliehapp at hotmail.com> wrote:
> > Hi!
> >
> > When I load 3D data into Paraview, I first get shown the outline, then I
> > change this to "surface" to see the associated attribute data. What´s the
> > difference between "surface" and "volume"? It looks the same to me - just
> > that I get an segmentation fault when I apply the gradient filter to the
> > data and then want to be shown the "Volume" - why is this?
> >
> > thx,
> > Natalie
> >
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> 
> 
> -- 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109

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