Hello, I am developing an application for iphone and ipod touch using openscenegraph. It is an augmented reality application and I have to load a very complex model. The original 3d model has 5 million vertices. Since I am using a mobile platform which is limited in computational power I simplified the model using 3d studio max. I reduced the size of the model from 500Mb to 4.2 Mb using proOptimizer. The model now has in total about 36,000 vertices and about 53,000 faces.
I am able to render it but frame rate is slow. I'd like to improve performance using back face culling. The point is I don't know how to activate it (if it is possible): I tried with these lines of code but frame rate is still low: [code] osg::StateSet* ss = _root->getOrCreateStateSet(); osg::CullFace* cf = new osg::CullFace(osg::CullFace::BACK ); ss->setAttribute( cf ); [/code] I am using OpenGL ES 2.0 and shaders. I setup the camera in this way: [code] //set the clear color of the camera to be transparent _viewer->getCamera()->setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f, 0.0f)); //set the clear mask for the camera _viewer->getCamera()->setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); _viewer->getCamera()->setRenderOrder(osg::CameraNode::PRE_RENDER); _viewer->getCamera()->setComputeNearFarMode(osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR); [/code] I use DO_NOT_COMPUTE_NEAR_FAR because I need to set manually projection and viewMatrix at every drawing cycle. I also initially set viewport like this: [code] _viewer->getCamera()->setViewport(new osg::Viewport(0, 0, graphicsContext->getTraits()->width, graphicsContext->getTraits()->height)); [/code] The hierarchy of my object is structured as: _root is a osg::MatrixTransform my 3d model is divided in subparts. all the subparts of my 3d model are direct child of _root and are of type osg::Node I hope you can give me some tips to improve performance. If you need some other information about my setup I will be glad to give it. Thank you. Greetings, John Moore _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
