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The IRR file format is used for the Irrlicht 3D engine, an open-source 3D engine.
IRR files are used to describe 3D scenes, including information such as models, materials, light sources, and cameras.
The IRR file uses XML format and contains different elements that describe the scene. Each element defines specific scene components, such as models, materials, light sources, and cameras.
The FBX format of AutoDesk was originally developed by Kaydara in the 1990s for storing 2D or 3D content with motion data. Over the years, due to its 3D animation capabilities, it has evolved into a widely used format for 3D modeling applications such as Blender, 3D Studio Max, and others.
This format is used to contain 3D models, including vertices, faces, and other 3D geometric graphics, as well as animation data. The format is proprietary, but there is a publicly available API for development purposes. The file content can be either text or binary, and the Blender Foundation has worked to document the format.