What is "qfusion"

Qfusion is a 3D game engine. The project was started by Victor Luchitz along with several others. It is written in C for use on Windows and Unix-based systems. The engine also supports the data of Quake III as maps, 3D models and shaders.

Qfusion is a fork of id Tech 2, popularly known as the Quake II engine. Qfusion is free and open-source software subject to the terms of the GNU General Public License (GPL).

The engine supports Ogg Vorbis sound and KTX ( ETC1), TGA, JPEG, PNG for images. More recent versions of Qfusion engine also extend the Q3 rendering scheme to include Normal Mapping, GLSL shaders (including bump mapping and cel shading), and skeletal animation.