Hi Chris, How you would tackle this depends greatly on what type of updates you will require. You don't really say what you are changing about the data and the motivation behind this so it's really hard to know what to recommend. Updates could range from changes to nodes to to vertices to uniforms. You say you want to update vertices but this may well not be the best route.
Robert. On Tue, Mar 16, 2010 at 3:54 AM, Chris <[email protected]> wrote: > Hi, > > I'd like some advice on using OSG for rendering many dynamic objects: > > I've got an app where as many as 10,000 objects (of 200 vertices each) may > or may not be updated each frame. Perhaps about 10% of the objects would > update on the average frame, but all of them could conceivably require it. > > I've been perusing the osg DrawElements code, with intention to use VBOs & > EBOs, and glBufferSubData to do the object updates. I'm trying to optimize > this within the OSG framework. I'm thinking of having one Geometry node > with 10K 'drawElements' primitive sets, each referencing the same (large) > VBO and EBO. Alternately, maybe having several VBOs each containing a > sub-group of the objects. > > I also notice a few blogs that recommend double buffering, i.e. releasing > the VBO/EBO to GL while it draws frame A (via NULL pointer call > glMapBuffer), and obtaining a pointer to a new or recycled buffer for > filling in data for frame B. There's also a debate about using 'glMapBuffer' > vs 'glBufferSubdata' to access the buffers. > > are ther any examples that employ double buffering in osg ? any other > techniques/suggestions ? > > Chris C > > _______________________________________________ > 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
