See http://www.sjbaker.org/steve/omniv/love_your_z_buffer.html
The values in the Zbuffer is 1.0 to 0.0 ( all realworld values are transformed in to this ) but it is NOT linear Gordon Product Manager 3d __________________________________________________________ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __________________________________________________________ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Leitner Sent: Monday, June 15, 2009 3:29 AM To: [email protected] Subject: [osg-users] Using the z Buffer Hi folks, I am using the z-Buffer in osg 2.4 and have problems getting reasonable values. When the camera is about two meters away from any flat object surface, I'll get the value 0.995, and when the camera is about eight meters away i'll get 0.997 from the z buffer. I have also tried to transform the z value into a distance value, but the distance value makes no sense! Below is my code! Cheers, Roland osgViewer::View* view = new osgViewer::View; viewer.addView(view); view->setSceneData(root); view->getCamera()->setProjectionMatrixAsPerspective(V_FoV_deg,V_FoV_deg/ H_FoV_deg,1,100); view->getCamera()->setViewport(new osg::Viewport(traits->width/2,0, 64, view->48 )); getCamera()->setGraphicsContext(gc.get()); osg::Image* image = new osg::Image(); view->getCamera()->attach(osg::Camera::DEPTH_BUFFER,image); image->allocateImage(64,48,1,GL_DEPTH_COMPONENT,GL_FLOAT); float z; while( !viewer.done() ) { viewer.frame(); z = ((float*)pmdimage->data())[1]; std::cout << "z value : " << z << std::endl; } ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13976#13976 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
