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MDD is a Metadata definition file format used to describe Metadata information about digital media content. MDD files contain object names, properties, relationships, and other related information that can be used by applications or systems to manage and process digital media content. The MDD format is commonly used to store model and animation data and is often used in game development. It can describe information such as geometry, texture, lighting, and animation of 3D models so that game engines can load and render this content quickly.
glTF (GL Transmission Format) is a 3D file format that stores 3D model information in JSON format. The use of JSON minimizes the size of 3D assets and the runtime processing required to decompress and use these assets. It is used by applications for efficient transmission and loading of 3D scenes and models. glTF was developed by the Khronos Group 3D Format Working Group and is also described by its creators as the JPEG of 3D.
The glTF file format defines a scalable, universal publishing format for 3D content tools and services, simplifying the creative workflow and enabling interoperable use of content across industries. The purpose of creating the glTF file format is to define a scalable, universal publishing format for 3D content tools and services, simplifying the creative workflow and enabling interoperable use of content across industries. It minimizes the runtime processing required by applications using WebGL and other APIs.