Select what you want to export inside your 3D modeling application.Use these guidelines to help ensure the best results: Unity supports FBX files which you can export from many 3D modeling applications.
For more information about importing these file formats, see the SketchUp Settings and SpeedTree topics. However, there are two file formats that do not use FBX as an intermediary: SketchUp and SpeedTree.
Note: This section provides information about proprietary file formats that use FBX conversion.