Hi All, I revamp this thread as my question is strictly related, as I'm trying to pack multiple geometries into shared VBO.
I'm creating a shared osg::Vec3Array for vertices, same for as many vertex attribute as I need, and then assigning these shared arrays to the different geometries (pGeom->setVertexArray() and pGeom->setVertexAttribArray() ) and telling the geometry to use VBO and not display lists. Then I create a new DrawElements for each geometry, with the correct vertex indices offset, and as I want them to share the same EBO underneath, I'm trying with: pDrawElemsUInt->setElementBufferObject(pSharedEBO); pGeom->addPrimitiveSet(pDrawElemsUInt); But I think I' missing something because, with gDebugger, I see that there are as many bindBuffer calls as num-geom * num-shared-buffers. Am I wrong in the way I try to share the drawElems EBO? Or missing something else? Thank you! Ricky On Mon, Jan 3, 2011 at 19:31, Jason Beverage <[email protected]>wrote: > Hi Terry, > > I was generating all my geometry in code so I wrote some custom code > to pack them tightly into a single vertex array. > > Jason > > On Mon, Jan 3, 2011 at 1:05 PM, Terry Welsh <[email protected]> wrote: > > Hi Jason, > > Thank you for the suggestion. I feel like I'm missing something > > still. Is there an Optimizer feature or something that combines > > Arrays for you? Or did you write a bunch of custom code that > > processes your models after you load them? > > -- > > Terry Welsh > > mogumbo 'at' gmail.com > > www.reallyslick.com > > > > > > > >> Message: 3 > >> Date: Sun, 2 Jan 2011 21:28:12 -0500 > >> From: Jason Beverage <[email protected]> > >> To: OpenSceneGraph Users <[email protected]> > >> Subject: Re: [osg-users] large VBOs for multiple Drawables > >> Message-ID: > >> <[email protected]> > >> Content-Type: text/plain; charset=ISO-8859-1 > >> > >> Hi Terry, > >> > >> You can pack the verts of your small objects into a single > >> osg::Vec3Array and share that array across multiple osg::Geometry > >> objects then use DrawElements for each geometry with the correct > >> indices. I've just recently done this actually for a project I'm > >> working on and it's worked out great. > >> > >> Thanks, > >> > >> Jason > >> > >> On Sat, Jan 1, 2011 at 6:21 PM, Terry Welsh <[email protected]> wrote: > >>> I found some email threads that hinted at this a little, but nothing > >>> seemed very specific. ?I have scenes where display lists perform a bit > >>> better than VBOs. ?My best guess is because my objects have relatively > >>> small vertex counts (usually between 20 and 200). ?Is there any way in > >>> OSG to use one large VBO to store the date for multiple Drawables in > >>> order to minimize buffer state changes? > >>> -- > >>> Terry Welsh > >>> mogumbo 'at' gmail.com > >>> www.reallyslick.com > >>> _______________________________________________ > >>> 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 >
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