A Blender file is a file format utilized by Blender, a widely-used 3D modeling and animation software. It is the default file format used by Blender to save and store all the data related to a 3D scene, including 3D models, materials, textures, animations, and more..
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U3D (Universal 3D) is a compressed file format and data structure for 3D computer graphics. It contains 3D model information such as triangle meshes, lighting, shading, motion data, lines and points with color and structure. The format was accepted as ECMA-363 standard in August 2005. 3D PDF documents support U3D objects embedding and can be viewed in Adobe Reader (version 7 and onwards).
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