Hi,
I'm experiencing a strange segfault with an inherited osg::Drawable.
Unfortunately I'm currently unable to provide an example demonstrating
this. The application is a clustered rendering system and for various
reasons I have to (un-)load scenes during runtime. These scenes are
implemented as plugins (shared objects). The application implements an
"unrolled" frame() loop and (un-)loading these scenes happens after the
call to updateTraversal().
The whole system is generally working but a newly created scene is
somehow problematic. The scenes consists only of a reimplemented
osg::Drawable where basically only drawImplementation() is overwritten.
This drawable renders a simple wire cube and display lists are disabled
(so drawImplementation() is called every frame). Rendering this scene
works fine.
Unloading and deletion of the shared object and its related data works
almost fine but the application crashes in unref() of a drawable during
the next cull traversal. Notice the "a" as I'm not entirely sure which
drawable is the problem (afaik there is only one).
The really strange thing is that the destructor of my drawable isn't
called. If I additionally call ref() on this object the segfault
disappears but the destructor still won't get called. The problem seems
to be independent of the threading mode. I've tried singlethreaded and
could verify (via debugger) that no threads where running during the
removal of the sceneroot of the shared object.
How is it possible that the next cull traversal reaches this drawable
when it is removed from my scene root before the call to
renderingTraversals()?
Is there anything obvious missing?
Is there anything happening in the rendering backend that I should be
aware of?
I haven't build OSG in debug mode but probably I'll try this next. Maybe
this will provide some useful insights.
I appreciate any idea on this.
Best regards and thanks in advance
Mathias Buhr
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