Hi, Peter This is because osg tries to compute bound of drawable based on vertices it uses. So if your restart index behind memory allocated for vertices storage osg will go out of array bound when computing bounds of drawable, thats where your access violation comes from. You can try to avoid this with setting initial bound yourself and\or setting your own computeBoundCallback on drawable. Another way is to add additional vertex to vertex array and use it index as restart index to make osg bound computation happy.
Cheers, Sergey. 07.08.2011, 00:26, "Peter Wrobel" <[email protected]>: > Hi J-S, > > Yes, thank you, that did the trick, now it works. And to answer my question > above, it has to be glEnableClientState, otherwise its not working. > > I have one more issue now. Sergey, I am getting a Access Violation Exception > directly after calling viewer.run inside osg::Vec3f line 84, if I use the the > default restart index of USHRT_MAX. > To debug this, I added a method to set the index, and got wired results. I > created an 18 Elements TriStrip, code is bellow. When I set the restart index > between 0 and 18 (18 is not a typo ), everything is fine. When I set it to 19 > and higher I get this in the console: > > Code: > > CullVisitor::apply(Geode&) detected NaN, > depth=-1.IND, center=(-2 0 -7.942e+037), > matrix={ > 1.#QNAN 1.#QNAN 1.#QNAN 1.#QNAN > 1.#QNAN 1.#QNAN 1.#QNAN 1.#QNAN > 1.#QNAN 1.#QNAN 1.#QNAN 1.#QNAN > 1.#QNAN 1.#QNAN 1.#QNAN 1.#QNAN > } > > If I set the index between 1000 and 2000 it works right ( ! ), and if I set > it to 5000 and above I get the Access Violation Exception again. > Do you have any idea what's going on ? Is this related to not creating an > StateAttribute ? > > TestCode, uses the class posted by hybr: > > Code: > > #include "DrawElementsUShortRestart.h" > > #include <osg/Geode> > #include <osg/Geometry> > #include <osg/PolygonMode> > > osg::ref_ptr< osg::Node > createDrawElements() { > > osg::Geometry * geom = new osg::Geometry() ; > > osg::Vec3Array * vrts = new osg::Vec3Array() ; > geom -> setVertexArray( vrts ) ; > > unsigned int numVrts = 18 ; > > // Create Vertex Positions for TriStripe > for( unsigned int i = 0 ; i < numVrts / 2 ; ++i ) { > vrts -> push_back( osg::Vec3( i , 1.f , 0.f ) ) ; > vrts -> push_back( osg::Vec3( i ,-1.f , 0.f ) ) ; > } > > // Create a PrimitiveRestart DrawElements > DrawElementsUShortRestart * drawElems = new DrawElementsUShortRestart() ; > > // This is set to false by default in the constructors initializer list > drawElems -> enableRestart( true ) ; > > // Added this method to the DrawElementsUShortRestart Class > drawElems -> setRestartIndex( 1000 ) ; // Try also 20 and USHRT_MAX > > for( unsigned int i = 0 ; i < numVrts ; ++i ) { > if ( i == 9 ) > drawElems -> push_back( 1000 ) ; // Try also 20 and USHRT_MAX > > drawElems -> push_back( i ) ; > } > > geom -> addPrimitiveSet( drawElems ) ; > geom -> getOrCreateStateSet() -> setMode( GL_LIGHTING , > osg::StateAttribute::OFF ) ; > geom -> getOrCreateStateSet() -> setAttributeAndModes( > new osg::PolygonMode( osg::PolygonMode::FRONT_AND_BACK, > osg::PolygonMode::LINE ) ) ; > > osg::ref_ptr< osg::Geode > geode = new osg::Geode() ; > geode -> addDrawable( geom ) ; > > return geode.release() ; > > } > > Thank you! > > Cheers, ParticlePeter > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=41911#41911 > > _______________________________________________ > 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
