So sorry if this is a way too obvious question but what is the difference between observer_ptr and ref_ptr? And when would you use one over the other? osg::observer_ptr : Smart pointer for observed objects, that automatically set pointers to them to null when they deleted osg::ref_ptr : Smart pointer for handling referenced counted objects They seem to do the same thing. At least I was able to replace all observer_ptr with ref_ptr and the example still compiled and ran. Best Regards
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