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
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