Hi David, On 9/26/07, David _ <[EMAIL PROTECTED]> wrote: > we´re workig with an osgdem generated island which is composed by a lot of > pagelod nodes. We´re also letting the databasepageloader to load and offload > nodes from memory. We need to know which nodes are visible and which nodes > are being deleted from memory > > question 1 : Is there any way to know which nodes are visible just before > the rendering traversals??
Its the cull traversal (the first half of renderingTraversals) which determines what is visible, you can't determine what's visible before this without doing your own mock cull traversal. > question 2 : Is there any way to know which nodes are being deleted and > execute a little piece of code before this happens?? The Viewer calls the database pager on each update traversal to merge new and remove unused subgraphs. You could override the Viewer::updateTraversals() to customize this, doing an querry of the DatabasePager yourself. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
