[vtkusers] vtkImageViewer2 OS X display problem

[Nikolaus Heger]

hello!

i compiled vtk 4.4 on OS X, and i can run all tests and all examples. i 
am running VTK via

Python 2.3
TclTkAquaBI-8.4.9.0

the problem now is that the images displayed in either vtkImageViewer2 
or using a vtkImageActor appear very garbled. attached - in case this 
mailing list allows attachments - is an image of the last supper, as it 
appears on screen on my mac in either vtkImageViewer2 or vktImageActor


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the same image appears normally using vtkImageViewer (not 2) and 
writing it out to disk.

i also noticed that when i resize the widget containing the image, 
sometimes it suddenly appears rendered correctly.

zoom / pan / rotate have no effect on the bug: if the image is garbled, 
it zooms/pans/rotates garbled as well, if it's ok it zooms/pans/rotates 
ok too.
more often than not the image is garbled.

this is on a powerbook G4 with ATI Rage M6 on OS X 10.3.8. my main 
suspect is the graphics card / OpenGL implementation.

does anybody have experience with this / know what's going on?

thanks!!

nik
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