Artefacts and related crash in vtkOpenGLVolumeShellSplatMapper

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General description: 
Shellsplatting causes artefacts and/or crashes if the viewing direction is
excactly -X or +X (See screenshots)
However there is no problem with Z or Y 

What steps will reproduce the problem?

I can reproduce this on both Windows and Linux with different computers,
using the vtkOpenGLVolumeShellSplatMapper standalone as VTK-Class in a
simple C++ example or using it withhin devide. 

If used as a C++ class and run in a debugger it occasionally also stops
with an access violation within:

vtkOpenGLVolumeShellSplatMapper::ippbtfFaceOnX line:956

In devide:
1. Load an ImageData volume data set
2. Use VolumeRender->ShellSplatting or shellSplatSimple
3. Use slice3dVWR
4. Rotate until you are viewing your data excactly from X or -X

What version of the product are you using? On what operating system?
I tried this with the current precompiled release and dev versions, both on
windows and linux

Original issue reported on code.google.com by [email protected] on 18 Jun 2008 at 9:41

Attachments:

• Clipboard01.png

[GoogleCodeExporter]

Thank you for this bug report!  I'm not going to be able to diagnose and fix 
this
before the 8.5 release, but I'll get to it before the next.

For my own information: this was with 8.2.2807, vDEV.3052 on Win and vDEV.3062 
on Linux.

Original comment by cpbotha on 18 Jun 2008 at 9:25

• Changed state: Accepted

[GoogleCodeExporter]

Original comment by cpbotha on 18 Jun 2008 at 9:26