[vtkusers] Serious bug, that freezes the system.

[David Gobbi]

Hi Jorrit,

As far as I know, VTK doesn't support having actors (or their mappers
or textures) shared between renderers.  So this might not be a bug,
as much as a limitation that should be better documented.

 - David

On Fri, 12 Jan 2001, Jorrit Schaap wrote:

> 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