Autodesk FBX file (.fbx)

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FBX file allow you to transfer 3D objects, 2D objects with height, light sources, cameras and materials between AutoCAD and 3ds Max.
The FBX file format is an open structure for the transport of 3D data, which provides a high level of interoperability between Autodesk software products. For example, in Autodesk 3ds Max you can export a file in FBX format and then open this file in the AutoCAD program to view and edit objects, light sources, cameras, and materials. You can export similar drawings to AutoCAD by exporting a drawing to an FBX file, and then viewing and editing this file in 3ds Max.
Points (but not cloud nodes), networks, NURBS curves and surfaces, split networks, target cameras, light sources, and materials are imported into AutoCAD in the same form as they existed when exporting from 3ds Max.

When importing FBX files

Trusted cameras created in 3ds Max are imported accurately.
The system variable LIGHTINGUNITS determines whether light sources should be imported as standard or photometric light sources.

When exporting to FBX files:

3D objects, 2D objects with height, light sources, cameras and materials are rotated 90 degrees along the Z axis.
You can increase their height to export two-dimensional objects. All visible and visualizable objects that have a height can be exported to the FBX file.
To export an 2D object to an FBX file, increase its height to convert it to a 3D object. All visible and visualizable objects or geometries that have a height can be exported to the FBX file.
FBX can be stored on disk as binary or ASCII data, the FBX SDK supports both formats.
Both formats are not documented, but the ASCII format has a tree structure with clear identifiers.
While the binary format is not documented, there is an unofficial specification provided by the Blender Foundation.
There is also a high level of informal specifications (in development), how data is presented in FBX (depending on ASCII or binary format), also published by the Blender Foundation.