Apocalypse is a single-player 3D shoot 'em up for Acorn Archimedes computers, written by Gordon Key. The game world is drawn using a combination of flat-shaded polygon meshes and sprites. Most of the targets in the game are animated and have amusing names such as 'weirding flasher' and 'proton flapper'.

This command-line program can be used to convert object models for the game from their original format into the simple object geometry format developed by Wavefront for their Advanced Visualizer software. OBJ format is a de-facto standard for 3D computer graphics and it has the advantage of being human-readable.