From: Norman Vine <nhv@ca...> - 2000-07-05 21:34:23
> 1. 3D Up Vector (Frank Warmerdam)
> 2. Re: 3D Up Vector (Steve Rawlinson)
> 3. 3D Tile Exclusion Idea (Steve Rawlinson)
Hello Frank et All,
We have iteratively improved on the viewing model
and the 3D tile clipper for the FlightGear project.
We use the flight simulator coordinate system
i.e y and z are swapped compared to normal OpenGL
Z = UP Y goes into the screen
Our code is GPL'd and I would be glad to answer any
and all questions.
The code is downloadable from
but the pertinent stuff in the CVS just had a major overhaul.
This is also available see instructions on above page.