[vtkusers] clipping bug with IPW on OS X

[John Hunter]

I have a renderer with some image plane widgets and some other data
(structured grids, spheres, tube filters).  Here is a screenshot of
the properly renderer data

  http://nitace.bsd.uchicago.edu:8080/files/share/planes_with_grids_app_window.png

On OS X 10.3, however, there appears to be a clipping bug.  My actors
are always clipped as if they are behind the planes, even when they
are in front.  If I rotate the scene to see the other side of the
plane, they will still be clipped behind the rotated plane.  Here is a
screenshot showning the clipping bug

  http://nitace.bsd.uchicago.edu:8080/files/share/clip.png

Note in addition to the problem of my data (spheres, tubes, grids)
being clipped, the image planes are not rendering properly either.

I am running VTK 4.4.1 built for X11 rendering and am using the
vtk.gtk.GtkGLExtVTKRenderWindowInteractor for pygtk-2 and GTK with
gtkglext.

The same code runs fine under linux and win32.

miriam:/var/tmp/VTK> uname -a
Darwin miriam.paradise.lost 7.2.0 Darwin Kernel Version 7.2.0: Thu Dec 11 16:20:23 PST 2003; root:xnu/xnu-517.3.7.obj~1/RELEASE_PPC  Power Macintosh powerpc

under python2.3

I can try an get a distilled example for a better bug report if
necessary, but before I went down that road I wanted to see if this is
a known bug or if there is a known fix.

Thanks,
John Hunter