Alan Ott wrote on Tuesday, April 28, 2009 10:34 AM: > Thanks for the info. From this, it seems like I can get a handle to the newly > loaded node before it gets added to the main tree. The only thing now is that > once I've got a handle to this node, I don't really know _what_ the node is > supposed to be (is it a terrain tile, a moving model? etc.). > > ReadFileCallback::readNode() gives me the ReaderWriterOptions, and it seems > like I could make a new option string telling me how to post-process this > model load, but I can't see how in PagedLOD to set ReaderWriterOptions.
Unfortunately, at the moment PagedLOD doesn't have a way to specify ReaderWriterOptions (and adding that ability is a little complicated, because we don't want a circular dependency between osg and osgDB). One thing you can do is subclass PagedLOD in your app to add the ability to specify a ReaderWriterOptions when it calls readNode(). > PagedLOD has the setDatabaseRequest() function, which based on another > mailing list post, looks like it is to be used as a "user data" pointer. The > problem here is that I don't know how to get this object from inside the > ReadFileCallback. This makes me think you're using an older version of OSG? The latest OSG in svn only has getDatabaseRequest() (which you can use to set the DatabaseRequest). In any case, the database request isn't really for "user data"; it is specifically for osgDB::DatabasePager use. > Robert Osfield wrote: > As Bryan wrote, what you need is to write a custom > osgDB::Registry::ReadFileCallback that will intercept all DB calls, > you then leave it up to Registry itself to the do the reading from the > plugin, but then you process the loaded data before passing the end > result back from the callback. Have a look at the ReadFileCallback > implementation and study the default implementations, this should give > you a clue how to put it together. > > On Mon, Apr 27, 2009 at 10:40 PM, Alan Ott <a...@signal11.us> > <mailto:a...@signal11.us> wrote: > > I'm using PagedLOD to load terrain tiles off disk. The problem I have is > that before I want the tile to actually render, I want to do a setup of the > tile (to look up certain control nodes and set switches according to the > current state of the system (eg: day/night mode, etc)). > > So on my own update(), I check to see if each PagedLOD has just loaded, and > if it has, I run the initialization on it. The problem is, when a tile gets > loaded, it is rendered for one frame _before_ I can do my initialization on > it. So for one frame, it is drawn wrong, then the next frame, it is drawn > right. > > I thought I might be able to get around this by setting the Node Mask to 0 > until it was initialized, but that seems to just keep the tiles from getting > loaded entirely (because the update traverser isn't getting into the > PagedLOD either). > > Do any of you have any ideas of what I could try to do to get around this? > Is there some value of the NodeMask that I could use to enable update but > not draw? Such a value did not seem to be documented in the API. -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
