This is the Doxigen documentation and source-code for the JNR game engine. The things I've implemented in JNR:

• Agent model for monster AI,
• Level representation suitable for action-adventure games,
• Extracting 2D cross-section from 3D geometry,
• Collision detection with line segments,
• Twisting the level in 3D,
• Rendering animated 3D models (with morph targets, not skeletal),
• Smooth interpolation between character states (walk,jump,attack),
• Particle effects for fire, smoke, glow.

Some videos of the engine here: http://www.atanaslaskov.com/engine/

The source code of JNR is under the 2-clause BSD license. There are a few bits I haven't published,
either because they're in need of rewritting or because they are not interesting.

Subsystems of the engine:

• AI - Agent model for creature artificial intelligence
• Core - Core of the engine (rendering, animation, collision detection, levels)
• GUI - Graphic user interface library
• RPG - Role-play system ( battles with monsters ! )