Hi Maria, I have tried using the setClampProectionMatrixCallback and make my implemetation from osg::_clampProjectionMatrix only make the follow change to calculate far plane from znear and nearfarratio.
// osg::_clampProjectionMatrix implementation: //double min_near_plane = zfar*nearFarRatio; //if (desired_znear<min_near_plane) desired_znear=min_near_plane; // my implementation: double max_far_plane = znear/nearFarRatio; if (desired_zfar>max_far_plane) desired_zfar=max_far_plane; But it seems not work well. Can you show me your implementation? Thank you! María Ten wrote: > Hi, > > You can disable the auto-compute near far and give a fix value for near and > far. > > If this method don't solve your problem you can add a callback to your root > node in the scene using the setClampProjectionMatrixCallback method of the > cullvisitor and override the clampProjectionMatrixImplementation method in > the class ClampProjectionMatrixCallback. In my implementation I compute the > nearest point in the geometry to set the near plane and then adjust the far > plane depending of the near plane and the nearFarRatio. > > This little hack work for my with very large terrains culling the far objects > in the scene instead of the nearest objects. > > Cheers, > > Maria. > > On Mon, Jun 29, 2009 at 11:27 AM, Ren Liwei < ()> wrote: > > > Hi, > > In my scene there is an earth and some small models on it. Sometimes i've > > got a screenshot like the attachment when i turn auto-compute near far on. > > I known that's becuase the auto-computed near plane is too far to let > > nearer primitives in. So i tried giving a very little nearfarratio and then > > it worked somewhat. But when i added an even larger sky sphere into the > > scene, once again i fall into trouble with near far. > > So what should i do with near far when there are both very near(less then > > 1) and far away(far then 100000000) things to show in the secen. > > > > Thank you! > > > > Cheers, > > indif > > > > ------------------ > > Read this topic online here: > > http://forum.openscenegraph.org/viewtopic.php?p=14637#14637 > > (http://forum.openscenegraph.org/viewtopic.php?p=14637#14637) > > > > > > > > > > _______________________________________________ > > osg-users mailing list > > () > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org) > > > > > > > > -- > María Ten Rodríguez > Instituto de Automática e Informática Industrial http://www.ai2.upv.es > (http://www.ai2.upv.es) > Ciudad Politécnica de la Innovación > Universidad Politécnica de Valencia > > ------------------ > Post generated by Mail2Forum ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=14733#14733 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
