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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.
The 3MF file is a modern 3D file format designed specifically for 3D printable models (additive manufacturing). It aims to be the successor to the popular traditional STL format (also a common format in 3D printing) to overcome its limitations.
The 3MF file format is based on XML and is compressed using standard Zip file compression to generate small, easy-to-transfer files. The format supports 3D meshes as well as all related materials and textures contained in the Zip file.