MD2

MD2 is a classic model format introduced by id Software for Quake II, using vertex animation (keyframe interpolation) to represent character actions. It was widely adopted in game development from the late 1990s to the early 2000s and remains a standard for retro game assets.

MD2's technical specifications are limited by its era: mesh vertex count has an upper limit, animation frames are fixed, and there is no skeletal system, resulting in limited expressive capability compared to modern skeletal animation formats. It is primarily found in retro game development, engine demos, and legacy asset archives.