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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.
DXF (Drawing Exchange Format) is an electronic drawing file format originally developed by AutoCAD and widely used. It is used to exchange and share 2D and 3D graphic data between different CAD (Computer Aided Design) software.
DXF files are in plain text format, which is readable and editable. It can store various types of graphic entities, such as points, lines, circles, polylines, polygons, arcs, text, and so on. In addition, DXF also supports storing metadata information such as layers, colors, linetypes, fonts, sizes, block definitions, and block references.
Due to DXF being an open file format, many CAD software supports importing and exporting DXF files. This enables the exchange of drawing data between different CAD software, facilitating collaboration and collaborative work between designers and engineers.
In DXF files, graphic data is saved in ASCII format and can be viewed and modified using a text editor. The structure of DXF files is clear and easy to parse and process. It is widely used in fields such as mechanical design, architectural design, and circuit design, becoming a universal data exchange standard between CAD software.