Hi Charama?? Perhaps the osgthirdpersonview example (OpenSceneGraph/examples/osgthirdpersonview/osgthirdpersonview.cpp) would be appropriate as this creates a third personal view of the main interactive view with the third person view showing the view frustum on the main view as a wireframe.
Robert. On 14 September 2012 10:36, Charma Man <motoko_kusan...@web.de> wrote: > Hello Forum, > > I am an absolute osg-beginner. I am currently working on a very huge project > which is using osg. I now would like to draw something in the existing scene > without messing everything up. I will try to give you as much detail as I can > to make it easier to understand. > > I have access to a callback-function which is called before every frame > drawing. Also I have access to the two matices > > > Code: > this->rootTransform = opencover::cover->getObjectsXform()->getMatrix(); > > // Get camera frustum parameters > osg::Matrix matProj = > opencover::coVRConfig::instance()->screens[0].camera->getProjectionMatrix(); > > matProj.getFrustum( > this->frustum.left, > this->frustum.right, > this->frustum.bottom, > this->frustum.top, > this->frustum.znear, > this->frustum.zfar > ); > > > > > As you probably see the call opencover::coVRConfig::instance() also returns > the instance. What I would like to do now is draw some simple lines (as in > like glBegin) but in screen coordinates, so with positions in the frustum > corners like (1,1,1) or (1,-1,-1). > > The reason for this is that I want to make the whole frustum "visible" > because I am using a stereoscopic VR-renderer and I want to validiate how big > the frustum is and when do you step "into" the 3D scene. > > I hope anyone can help me with this and can provide some simple sample code. > If you need more detail, feel free to ask back. > > Thank you! > > Cheers, > Charma > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=50045#50045 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
