Hi Robert,
I use two way to modify my scene graph.
The first one is using the UpdateCallback each time it is possible.
The second one is when we are outside the ViewerBase::frame() function.
Our application have a lot of threads and i use a mutex to be sure the OSG
tree is never access in the same time by two or more threads.
The code like this:
mRenderingTreeMutex.lock
mViewer->frame()
mRenderingTreeMutex.Unlock
And each time i touch the OSG tree, i use the same mutex.
mRenderingTreeMutex.lock
Modifiying OSG tree
mRenderingTreeMutex.Unlock
So in my case i call the Viewer::setLightingMode between my
mRenderingTreeMutex and the function modify the internal variable
_lightingMode. According to the debugger, this variable is process during the
cull_draw that is made by all camera's thread in the same time.
So, during one thread call the _globalStateSet->removeMode(GL_LIGHTING)
function, another one use the _globalStateSet variable and this variable is the
same for all threads that cause the crash.
Everything append in the void SceneView::setLightingMode(LightingMode mode)
function.
To temporary solve my problem, i add a mutex to protect the access to the
_globalStateSet variable.
Maybe this variable can be process in the update instead of the cull/draw?
Thank you!
Cheers,
Sylvain
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http://forum.openscenegraph.org/viewtopic.php?p=59099#59099
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