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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.
GLB is a binary file format representation of 3D models saved in GL Transfer Format (glTF). Information about 3D models such as node hierarchy, cameras, materials, animations, and meshes in binary format. This binary format stores glTF assets (JSON, .bin, and images) in binary blobs. It also avoids the problem of increased file size that occurs in the case of glTF. The GLB file format brings compact file size, fast loading, full 3D scene representation, and extensibility for further development. The format uses model/gltf-binary as the MIME type.