FBX

FBX (Filmbox) is a proprietary model file format developed by Kaydara and owned by Autodesk since 2006. Although the format is proprietary and not officially documented publicly, it has been thoroughly reverse-engineered, and as such proves a popular format for intermediate transportation between applications. Many modern modeling programs, such as Blender, support FBX natively.

The StudioMDL used by the CS:GO engine branch version of Source 1 supports FBX as an input format for static meshes. Source 2's Hammer 5.x and ModelDoc Editor support importing and exporting models as FBX files as an alternative to using DMX files.

External links

•  FBX on Wikipedia