• Basic gameplay: press SPACE to fire a missile, F11 to spawn more targets.
• Clouds, sprite graphics.
• Sound effects (thunder when breaking sound barrier, stall warning). Requires PLIB.
• Aircraft stalling.
• Basic physics model (acceleration, thrust/drag/lift/weight).
• HUD (alt, Mach, throttle, target boxes).
• Multi-threaded terrain generation.
• Program settings can be edited thru textual .conf files in the data/ subdir.
• For Babylon 5 viewers: an F-14 model is infused with Shadow technology (shimmering textures).

Legal Notice: This software (source code and binaries) is released
under the terms of the GNU General Public License (GPL) Version 2.
Source code is copyright © 2004,2007 Jim Brooks (except where noted otherwise).
Source code was integrated only with other source code components also
licensed under GPLs which are likewise copyright by their authors.

• Systems: Portable across GNU systems with OpenGL graphics (Linux, FreeBSD, Apple Mac OS X).
• Source code: Written in C++ using GNU software. Tools written in Python.
• 3D engine: 3D engine specialized for flight simulation based on BSP tree and graph data structures.
• Modules: Low-level graphics functions, 3D engine, application-level modules.
• Events: Modules can broadcast events to listeners in other modules.
• State-sorting by graph: Graph sorts polygons and attributes to reduce OpenGL state changes.
• Visitors: Pervasive use of the Visitor design pattern (technique used in OpenSceneGraph).
• Efficient collision-detection: BSP trees are used to detect when a 3D object has collided into another.
• Dynamically-generated terrain: Terrain model based on heightmaps that are dynamically generated using noise functions.
• 3D models: Engine can import 3D models from Blender.

Supported operating systems: Linux (Ubuntu), FreeBSD, Mac OS X.
Minimum CPU: 2 Ghz.
Minimum GPU: Video card made in 2003 with 32MB.
Minimum mem: 512MB.
Graphics: OpenGL, GLUT.
Sound (optional): PLIB.
Required software: GNU tools, development packages, Python, zlib.

Tested operating systems: Ubuntu Feisty Fawn (i386/amd64), FreeBSD 6.2, Mac OS X Tiger (PowerPC).
Tested video cards: Nvidia GeForce 5500FX, 7600GT, ATI Radeon 92xx,95xx (Apple), Mesa3D SW (Sony PS3).

Linux FreeBSD
OpenGL and GLUT are usually installed on Linux and FreeBSD from the XFree86 and Mesa packages.

Ubuntu
On Ubuntu (Feisty Fawn), these development packages are required:

apt-get install g++ freeglut3-dev xorg-dev zlib1g-dev

Mac OS X
Requires Xcode developer tools and X11 which are supplied on the Mac OS X installation discs.
May also require Fink (Mac ports of GNU tools).

Windoze
-- Not supported --
However, Version 2 [2007/08/31] was compiled using cygwin 1.5.x with OpenGL GLUT 3.7.6 DLL and ran on Windows XP.

Linux FreeBSD Mac OS X
Just type make (gmake on FreeBSD).
Ubuntu users will need to install development packages (OpenGL, X11, zlib, plib).

Linux FreeBSD
Sound effects requires PLIB.

A joystick is supported using the Linux or OpenGL GLUT joystick drivers.
Joysticks have been tested on:
Linux 2.6 (Ubuntu), FreeBSD 6.2, Mac, cygwin 1.5 (flakey), Playstion 3.

Joystick is disabled by default. To enable joystick, pass -j
See manual.

Joystick problems:

• A CPU < 1 Ghz won't be fast enough for smooth joystick control.
• Linux: Try modprobe joydev or running as root.
• FreeBSD: Try installing the port devel/linux-js.
  linux-js emulates a Linux joystick driver at /dev/input/js0
• cygwin's joystick driver is flakey
• Delayed reaction to joystick input:
  This happens on slow systems. Try increasing JoystickInputQueueOverflow in settings.conf.
• Linux: Analog joystick attached to Ensoniq ES1317 on Linux kernel 2.6:

Edit /etc/modules:
joydev
analog
ns558

Edit /etc/modprobe.d/options:
options snd_ens1371 joystick_port=1

Reboot.  udev should auto-magically make the required
device node /dev/input/js0 after "modprobe analog" is run.

• Many flight simulator features aren't implemented yet.
• Mac: Press the Apple key while pressing a function key.
• Known problems on cygwin and some GLUT joystick drivers.