HI Gianluca, Please have a look at the osghud example.
Robert. 2009/3/23 Gianluca Natale <[email protected]> > Hi All. > I need to draw a 2D drawing (a single wireframe rectangle) over a 3D > drawing of a scene. Basically I need it to show a window selection in the > scene. > > In OpenGL, I would set a perspective projection like glFrustum(…), draw the > scene, then set a glOrtho2D(…), and draw the rectangle. Finally I would call > a swap buffers. > > How can I do it with OSG? > > I mean, in OSG the projection matrix is associated with a camera. So, > should I use two cameras, one for the 3D scene, the other just for the 2D > rectangle? > > In camera::frame there is the swap of the back and front buffers. But I > would like to swap those buffers just at the end, after drawing everything. > > So, should I call the drawing of the 3D camera without swapping, then the > drawing of the 2D camera with swapping at the end? > > I read in the quick start guide of OSG of the thread for draw traversal. > Since I call camera::Frame twice, does OSG create 2 different threads? > > Is there any conflict between those threads, since they draw with different > projection matrices? > > > > Thanks in advance > > Gianluca Natale > > > > _______________________________________________ > 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
