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. b3DM files typically contain geospatial data such as buildings, terrain, vegetation, etc. These data exist in the form of 3D models and can be visualized and analyzed on virtual Earth platforms or other 3D geographic information systems.
The. b3DM 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.
. b3DM files typically use compression algorithms to reduce file size and improve transmission efficiency. Common compression algorithms include glTF Draco compression based on Magic Number and quantization compression.
The. b3DM 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. b3mm files, used to present large-scale geospatial data in web browsers.
glTF (GL Transmission Format) is a 3D file format that stores 3D model information in JSON format. The use of JSON minimizes the size of 3D assets and the runtime processing required to decompress and use these assets. It is used by applications for efficient transmission and loading of 3D scenes and models. glTF was developed by the Khronos Group 3D Format Working Group and is also described by its creators as the JPEG of 3D.
The glTF file format defines a scalable, universal publishing format for 3D content tools and services, simplifying the creative workflow and enabling interoperable use of content across industries. The purpose of creating the glTF file format is to define a scalable, universal publishing format for 3D content tools and services, simplifying the creative workflow and enabling interoperable use of content across industries. It minimizes the runtime processing required by applications using WebGL and other APIs.