Robert,
I found the revision that caused the regression. Ironically, it occurred
way before the 3.1.6 release...
See r13092 associated with
http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk/src/osgViewer/Viewer.cpp
The 3.1.2 behavior returned when I reverted that revision. A notable
behavior change that I noticed is that before I reverted r13092, the
OSG_INFO<<"Reset event time from ..." line in EventQueue::takeEvents()
would trigger extremely often (e.g., while hovering over the viewer
window). It does not trigger at all after I reverted r13092.
See also the cutOffTime variable in Viewer::eventTraversal() which
explains the link to ON_DEMAND frame scheduling.
Do you happen to know the original intention of r13092? The log message
is "Moved the frame() event into the event traversal after then events
and their state have been accumulated."
Thanks for the help,
Judson
On 5/22/2013 3:02 PM, Judson Weissert wrote:
Robert,
I have made some progress. The problem appears to be caused by an
eventTimeDelta of zero which is calculated within
StandardManipulator::performMovement(). It eventually results in a
divide by zero and the propagation of non-finite value(s) through the
remainder of the call chain. Specifically, dy in
OrbitManipulator::zoomModel() and OrbitManipulator::panModel() ends up
being a non-finite value.
Thus, I have found an explanation for the symptoms, but I have not
tracked down the underlying cause of eventTimeDelta being calculated
as zero. Therefore, I have not been able to create a small example
case yet.
Regards,
Judson
On 5/22/2013 2:37 PM, Robert Osfield wrote:
Hi Judson,
It's a curious set of circumstances but as yet I can't think of a
specific cause.
Is there any chance you can create a small example that illustrates
the problem so that I can try it out and see if I can spot the
problems.
Cheers,
Robert.
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