[vtkusers] vtkVolumeRaycastMapper and vtkRenderLargeImage

[Simon Drouin]

I confirm it is only happening with volume rendering and will add that the
problem is not present when using vtkVolumeTextureMapper3D but only with
vtkVolumeRayCastMapper.

I suspect the problem comes from vtkRayCastImageDisplayHelper, which is also
used by vtkFixedPointVolumeRayCastMapper and
vtkUnstructuredGridVolumeRayCastMapper. I haven't tried those 2, but if
someone could confirm that they have the problem too, it would make it much
easier to find the bug.

s.

On Wed, Apr 15, 2009 at 5:06 PM, Kevin H. Hobbs <hobbsk at ohiou.edu> wrote:

> On Thu, 2009-04-02 at 10:17 -0400, Simon Drouin wrote:
> > Hi all,
> >
> > Using vtkVolumeRaycastMapper for volume rendering in conjunction with
> > vtkRenderLargeImage with a magnification factor of 2 produces images
> > with a black column of pixels in the middle of the image. The same
> > scene rendered with vtkVolumeTextureMapper3D is perfectly fine. I get
> > the same result both on windows XP (MSVC 9) and OSX.
> >
> > I suppose the problem is that vtkVolumeRaycastMapper doesn't render
> > the last (or the first) column of pixels, which doesn't show too much
> > when it is on the side of the window. When using vtkRenderLargeImage
> > with a magnification of 2, the last column of the first block ends up
> > in the center of the screen.
> >
> > Has anyone tried to address this problem yet? I might dive into it if
> > I have time soon, though I'm a little bit affraid of the
> > vtkRaycastMapper code :-)
> >
> > s.
>
> Ah, the message is at:
>
> http://markmail.org/message/6syjeeln67uwx76e
>
> and there is a bug report at:
>
> http://www.paraview.org/Bug/view.php?id=7858
>
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