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Model Data version 2 (MD2) is a 3D model file format used in Quake 2 games to load and render 3D models in games. It was developed by id Software and is part of the Quake 2 engine. The MD2 file contains information such as the geometry of a 3D object, texture mapping coordinates, and all the frame data that needs to be animated. This format is designed to be very compact so that large amounts of animation data can be stored and loaded and rendered quickly at runtime. Although MD2 is outdated, it has important implications for the history of games and the development of Computer Graphics. In addition to Quake 2, several other games have used this format.
COLLADA is an XML-based digital asset exchange solution for interactive 3D applications, allowing 3D creation applications to freely exchange digital assets without losing information - enabling a powerful toolchain pipeline combining multiple DCC and 3D processing software packages. Its unique interactive mode provides a comprehensive visual compilation. COLLADA FX supports the creation and encapsulation of shaders using OpenGL ES shading language, enabling first-class 3D creation tools to effectively collaborate in creating OpenGL / OpenGL ES applications and assets.
COLLADA is an open standard, originally used for 3D software data exchange, initiated by SCEA, and now supported by many well-known manufacturers such as Autodesk and XSI. COLLADA can be used not only for exchanging data between modeling tools, but also as a scene description language for small-scale real-time rendering. Because COLLADA DOM has rich content for representing various elements in the scene, from polygonal geometry to cameras, we can use the COLLADA DOM library to read and process scene files. The programming method of COLLADA DOM is similar to COM.