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. i3DM files typically contain 3D models of geospatial data, which can be buildings, trees, vehicles, etc., for visualization and analysis on virtual Earth platforms or other 3D geographic information systems.
The. idmm file stores data in binary format, which makes it more efficient and can accommodate a large amount of geometric information, texture maps, and other attribute data.
The. idmm format supports model instantiation, which means that the same model can be used multiple times in the file without the need to store geometric information and texture maps repeatedly, thereby reducing the file size.
The. i3DM format is widely used in fields such as virtual earth platforms, GIS software, and game development. For example, the 3D Tileset format in CesiumJS is based on. idmm files, used to present large-scale geospatial data in web browsers.
Draco is a glTF extension for mesh compression, an open source library developed by Google for compressing and decompressing 3D meshes to significantly reduce the size of 3D content. It compresses vertex positions, normals, colors, texture coordinates, and any other general vertex properties, increasing the efficiency and speed of transferring 3D content on the web.