Hi Litingbaotou, On Mon, Apr 21, 2008 at 12:57 PM, litingbaotou <[EMAIL PROTECTED]> wrote: > Thanks for your advise, I think it's a near plan clipping problem. I've > tried change the near plan param in setProjectionMatrixAsPerspective () from > 0.000001 to 1.0, but it didn't work. Could you give me some advise about how > to fix this near plan clipping problem? Thanks.
By default the OSG automatically computes the near and far planes so they encompass the scene, when you have a big scene this push the far plan out as far as the most distant point in your view frustum. If you are inside the model then the near plane will in effect move to coincide with the eye point - but OpenGL can't handle near plane distances of 0 so it'll compute it's position based on a near distance = near far ratio * far distance. The near far ratio is stored in the osg::CullSettings class, which is inherited into osg::Camera, if you lower the near far ratio, then the near plane will move near to you - so it'll clip out less, but... the downside is the depth precision of the depth buffer goes down so z fighting will become more likely. camera->setNearFarRatio(0.0001f;); // default is 0.0005f; Alternatively you can set the env var OSG_NEAR_FAR_RATIO to the value you want, this will override the default. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
