[vtkusers] Serious bug, that freezes the system.

[Jorrit Schaap]

Hi,

I've finally been able to write a small and simple demo programm to
demonstrate a very serious bug somewhere in the picker. The programm can be
found in the attachement of this mail. I've had this bug for a long time now
in my own programm, but was never able to reproduce it in a small and simple
programm. So, here it is, I suspect that the bug is somewhere in the
picker...

Here's a description of what happens. When you run the programm, two
renderwindows appear, both showing the same cone. This cone is created by
the same source, mapper and actor, and then attached to both windows. You
can now rotate and pan and zoom in both windows... everything is fine and
working as it should be. Now, press 'o' on your keyboard (to set the
interactorstyle to object/actor mode), and try to click on the cone and
rotate or move it. Depending on your hardware configuration, your system
should either totaly freeze, or at least the behaviour of the interaction
should go funny and eventually the programm will crash. Try also to place
another window (explorer or so) underneath the renderwindow. On some
platforms you will see the lower window 'through' the renderwindows.

I have tested this on multiple systems, running WinNT and Win2000, with
different video cards. Only with a GeForce the system totally freezes. With
other types of video cards the programm behaved funny, and then crashed. We
are currently using the nightly version from 27/10/2000, but we have had
this problem for over at least a year, using many different versions of vtk.

Just a last note: If you're going to try to find this bug, please save all
the stuff you're working on and close all aplications... ;-)

Best regards, Jorrit.

--
Jorrit Schaap
Division of Image Processing
Leiden University Medical Center
+31 71 5266206
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