virtual osg::Object* cloneType() const { return new name (); } \
virtual osg::Object* clone(const osg::CopyOp& copyop) const { return new name (*this,copyop); } \
virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const name *>(obj)!=NULL; } \
virtual const char* className() const { return #name; } \
virtual const char* libraryName() const { return #library; } \
virtual void accept(osg::NodeVisitor& nv) { if (nv.validNodeMask(*this)) { nv.pushOntoNodePath(this); nv.apply(*this); nv.popFromNodePath(); } } \
META_Node macro define the standard clone, isSameKindAs, className and accept methods. Use when subclassing from Node to make it more convenient to define the required pure virtual methods.