For rendering, data variance only applies to Drawables and StateSets, not to Nodes. Data variance on Nodes is only honored by the osgUtil::Optimizer. So if you want to change your materials at runtime in multi-threaded mode, set the StateSet d.v. to DYNAMIC.
Glenn Waldron / @glennwaldron On Thu, Aug 29, 2013 at 8:15 AM, Robert Milharcic < robert.milhar...@ib-caddy.si> wrote: > On 29.8.2013 10:30, Peter Bako wrote: > >> Hello guys. >> >> What is the correct way to change materials during rendering? What >> callbacks should I use, update callback? >> Sometimes I get a crash and I assume it is becasue of changing the >> material. >> >> Should I use special updateCallback on every geode/geometry I am >> changing, or it is enough to use the callback on a parent and change the >> state attributes also on children? >> >> Should the data variance be DYNAMIC on these nodes? >> > Hi Peter, > > If I'm not mistanken, DYNAMIC variance has to be set only at the Node(s) > associated with the state set (containing material state attribute) you > want to modify. Then you can change material before or after frame, in > update or event traversal, or you can attach update operation to the > viewer/view with addUpdateOperation/**removeUpdateOperation . > > Changing variance to DYNAMIC will introduce some performance penalty. If > this is unacceptable you can always use "clone state set trick". You simply > clone state set, change it, and then assign new stateset and update its > parents. Old state set will be deleted by ref_ptr when no longer needed. > This will prevent disruption of the rendering traversals. See how it is > done in StateSetManipulator::clone() in osgGA module. > > If I'm wrong please someone correct me :) > > Robert Milharcic > > ______________________________**_________________ > osg-users mailing list > osg-users@lists.**openscenegraph.org <osg-users@lists.openscenegraph.org> > http://lists.openscenegraph.**org/listinfo.cgi/osg-users-** > openscenegraph.org<http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org> >
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
