Hi Robert and all, I've encountered a crash problem while managing and rendering huge scene in OSG. To make it work smoothly, I use both the IncrementalCompileOperation and SharedStateSetManager to help improve the paging process. Both my application soon crashes when the camera is moving over the scene quickly (which means the scene data is also quickly and frequently loaded and unloaded). I debug into it and surprisingly find that the databaseRequest->_loadedModel is sometimes empty in the DatabasePager::addLoadedDataToSceneGraph() and thus causes the issue. I add a determination before using the SharedStateManager to optimize the model and the problem seems disappeared:
if (osgDB::Registry::instance()->getSharedStateManager() && databaseRequest->_loadedModel.valid()) osgDB::Registry::instance()->getSharedStateManager()->share(databaseRequest->_loadedModel.get()); I suggest make such changes in the trunk, too, so we won't meet the same crash problem again. But it in fact doesn't find the truth: when and how a request in the _dataToMergeList list is changed and the loaded model pointer is made invalid? I'm just curious about the reason why the _loadedModel is reset unexpectedly. Is there any other possibilities? Regards, Wang Rui
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