Thank you for answering so fast, Robert. I guess I'll try something like "parent->addUpdateCallback(new CallbackThatCleansThingsInChildren())", since I'm writing generic code (I don't want to change parents' code).
Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ Le Wed, 26 Nov 2008 15:24:38 +0100, Robert Osfield <[EMAIL PROTECTED]> a écrit: > Hi Sukender, > > The approaches I'd used are either: > > 1) A top level clean up tool that runs before/after the update > traversal - like your suggestion of a manager, but in > essence it just a list of objects to remove from the list. > > 2) Have a callback above the child you want to remove do the removal, > prior or after the traversal of the subgraph, > note Node callbacks are all effectively traversal callbacks so > have complete control over when traversal happens. > This approach doesn't invalidate an iterators. > > The invalidation of iterators occurs when you remove self from a > parent during traversal. > > Robert. > > > On Wed, Nov 26, 2008 at 2:11 PM, Sukender <[EMAIL PROTECTED]> wrote: >> Hello all, >> >> "Modifying elements on the scene graph that affect traversal during >> traversal is a [...] restriction, simply because doing so invalidates >> iterators of the calling methods.", Robert said ( >> http://lists.openscenegraph.org/htdig.cgi/osg-users-openscenegraph.org/2007-September/002938.html >> ). >> >> Question is: according to you, what is the best/simpliest way for a node to >> deallocate itself during traversal? Here are my ideas: >> - Mark the node as to be deleted in a kind of manager that does the job when >> the frame has ended. >> - Create a class derived from Group that gracefully handles the invalidation >> of iterators during traverse(). >> - Make a nice memory leak (joking). >> - Or may Node::accept() return a boolean that says if the node "commited >> suicide" (???) >> >> I guess ther is a much simpler way, but I can't figure out which one. >> (Sorry if it has already been discussed, but I can't find answers in the >> archive). >> >> Thanks. >> >> Sukender >> PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
