Hi, It isn't the window system (e.g. Microsoft Windows) which uses the Y coordinate as the vertical axis of the screen. It's OpenGL. (On my windowing system Y is down).
> Worrying about what OpenGL implicitly calls "up" is not useful It may not be useful at the app level, but it's essentail if you're trying to calculate the up-vector. > Invertible or not, it's still just another matrix The projection matrix has a very different role to the ModelView matrix, which is one reason why it has its own matrix stack. Cheers, Mik ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=42811#42811 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
