MD2n

MD2n is a file format primarily associated with the game Half-Life 2 and its subsequent episodes. It is a proprietary format used by Valve Corporation for storing 3D models. The 'MD' likely stands for "model," and the '2n' might refer to a version or internal designation. These files contain not only the geometric data of a character or object but also its associated animations, rigging information, and texture references. This allows the game engine to render and animate complex entities within the game world. MD2n models are typically compiled using Valve's Hammer editor and the Source SDK, a suite of tools provided for developers. The format is optimized for real-time rendering, making it efficient for the demands of video games. While it is a core component of Half-Life 2's asset pipeline, the MD2n format is not publicly documented in detail by Valve, and its internal structure is largely understood through reverse engineering and community efforts. Its use is largely confined to the Source engine and games built upon it.