[osg-submissions] FW: osgViewer/Viewer causing crash with threading

[Sir Magic]

I am working with OpenSceneGraph version 2.0 but the same problem
exists in 2.1.1.

Sorry if this is my mistake, but

I am realizing a viewer before my scene has been added.

In single threaded mode I have no problem.

I when I set threading to DrawThreadPerContext I get a crash.

I have reviewed the code and the problem occurs in
Viewer::startThreading

Early on there is a
        if (getSceneData())
test and special processing for is the scene is present.

The next reference to getSceneData - the statement :
    getSceneData()->accept(sodv);
is unprotected and will crash if scene data has not been loaded.

In order to get past this crash I have added a test
        if (getSceneData())

around the allocation of the StaticObjectDetectionVisitor and the
getSceneData()->accept.

Leo

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