Ha! What a coincidence. I just encountered this exact same thing today. When you call "new Node", you get a Node. Nodes don't have children, only Groups have children. So you don't want to use the copy constructor if you want to copy a whole subtree.
I discovered that OSG offers an alternative to the copy constructor to get around just this very issue. Use the clone() method. So, instead, your code should look like this: osg::ref_ptr<osg::Node> copyA = A->clone( osg::CopyOp::DEEP_COPY_ALL ); "copyA" will be a ref_ptr to a Node, but the actual type of the object pointed to will be a clone of A, so if A is a Group (with children), then copyA will also be a Group. Later, -Paul > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Judie > Sent: Wednesday, April 16, 2008 2:21 PM > To: [email protected] > Subject: [osg-users] Using a visitor after a DEEP_COPY_ALL > doesn't returnanything > > HI, > > I want to make a copy of an existing node and all it's > children, and then find all the geometry and make it transparent. > > I do something like > > osg::ref_ptr<osg::Node> copyA = new osg::Node(*A, > osg::CopyOp::DEEP_COPY_ALL); > > where A is the original Node tree. > > If I try to use the findNodeVisitor: > > findNodeVisitor nv(FINDNODETYPE_NODETYPE|FINDNODETYPE_FINDALL, > "Geode"); > copyA->accept(nv); > std::vector<osg::Node*> nodeList = nv.getNodeList(); int > length = nodeList.size(); > > then length is 0. > > If I do the same with the original node: > > findNodeVisitor nv(FINDNODETYPE_NODETYPE|FINDNODETYPE_FINDALL, > "Geode"); > A->accept(nv); > std::vector<osg::Node*> nodeList = nv.getNodeList(); int > length = nodeList.size(); > > then length is 32. > > Also if I try to cast the copyA to a osg::Group* I get a null pointer: > > osg::Group* temp = dynamic_cast<osg::Group*>(copyA); > > temp is a null pointer. > > So did I miss a step somewhere? > > Judie > > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-opensce > negraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
