This is actually something I have been curious about for exactly how it is done as well. What about if you have a Geode who you are going to add or remove drawables to. Do you make those drawables DYNAMIC?
From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Thursday, March 06, 2014 6:44 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Must I call setDataVariance(DYNAMIC) to a group node? HI Wu, You only need to set the Node DataVariance as a hint to the osgUtil::Optimizer that is typically only used after loading a new model, the Node DataVariance is not used during the update, event, cull or draw traversals. However, when using DrawThreadPerContext or CullThreadPerCameraDrawThreadPerContext threading models the StateSet and Drawable DataVariance is used to prevent dynamic leaves of the scene graph being updated and rendered at the same time - the draw traversal holds back the main thread till all the dynamic objects have been dispatched. Robert. On 6 March 2014 03:35, ttaw <[email protected]<mailto:[email protected]>> wrote: There's a saying on internet that setDataVariance(DYNAMIC) must be called to a group node which is to be changed while updating. But in my opinion, it's unnecessary because the child drawable pointers and stateset pointers are saved in ReaderLeaf as a ref_ptr if OSGUTIL_RENDERBACKEND_USE_REF_PTR is defined. In fact, this macro is defined in the begining of the file "RenderLeaf".Even if one or more child nodes were removed while updating, the drawables wouldn't be deleted and no crash would happen. We must set a node dynamic only when its stateset is to be changed or its drawables are to be changed. But I'm not sure of this and want to know if I'm right.Could anybody tell me the truth?Thanks. ------------------ Failure is the mother of success. Wu Zhicheng _______________________________________________ osg-users mailing list [email protected]<mailto:[email protected]> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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