Hi Marttin, osg::Camera always has a projection and view matrix, you can't disable/remove them.
osg::Camera stores the projection matrix as a 4x4 matrix, which you can get using Camera::getProjectionMatrix(). When you set the projection matrix using setProjectionMatrixAsFrustum(...) it does the equivalent of glFrustum, setting the 4x4 matrix appropriately. The left, right etc parameters aren't ever stored, it's only the 4x4 matrix. When you do Camera::getProjectMatrixAsFrusutm(..) it recovers the left, right etc values from the 4x4 matrix. As to what might be wrong in your case, we'll it's very likely that the OSG itself is doing anything wrong as these methods are commonly used and tested, more likely is that you own expectation are mismismatched with what is actually happening. You don't say anything about the wider context of your camera use, or why you think the values are correct so I can't speculate what the actual problems might be. Robert. On Mon, Mar 9, 2009 at 11:47 AM, Martin <[email protected]> wrote: > Hello, > > when i create a camera: > > osg::ref_ptr< osg::Camera> cam = new osg::Camera(); > > and I want to get the frustum parameters: > > cam->getProjectionMatrixAsFrustum(left,right,bottom,top,znear,zfar); > > I dont't get the parameters. It seems that the camera hasn't a projection > matrix. Where is the projection matrix define in this situation? When I set > my own projection matrix with setProjectionMatrix( ... ) it works fine. > > Cheers, > > Martin > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=8087#8087 > > > > > > _______________________________________________ > 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
