What's New in the MotionBuilder 2026 SDK

• Software Dependencies
  • Linux:
  • Windows:
  • Common:
  • Common (optional):
• Changes to the API
  • New classes
  • New properties and enums
  • New enums values
  • Deprecated properties
  • Changes specific to the Python API

Software Dependencies

The following operating systems, compilers, and languages are required:

Linux:

• RHEL 8.10/9.3/9.5, or Rocky Linux 8.10/9.3/9.5
• gcc-toolset-11

Windows:

• Windows 10/11
• Microsoft Visual Studio 2022, with the "Desktop development with C++" and "C++ CMake tools for Windows" Visual Studio components installed

Common:

• CMake 3.19 or higher
• Ninja build
• Python 3.11.9
• FBX SDK 2020.3.7

Common (optional):

• QT 6.5.3
• PySide2 6.5.3
• Boost 1.85.0
• USD 0.24.11

MotionBuilder now requires CMake and Ninja to compile samples and new plugins. See Using C++ with MotionBuilder for details.

Changes to the API

New classes

• FBEventPreShow: event fired before a layout is shown.
• FBEditColorAndAlpha: lets you add and control a color and alpha edit widget.

New properties and enums

• OnPreShow added to FBLayout: new callback called before a layout is shown.
• HUDs added to FBFbxOptions: lets you control if the FBX should handle HUD elements or not.
• OnTransportFpsChange added to FBPlayerControl: new callback called when the system frame rate used for display has changed.
• FirstLoopMarkIn, LastLoopMarkOut, SourceMarkIn and SourceMarkOut added to FBStoryClip: lets you control the various times associated to a story clip.
• PythonVersionString added to FBSystem: returns the Python interpreter version being used.

New enums values

• kFBKeyF13 up to kFBKeyF24 added to FBInputKey: C++ only, lets you capture the F13 to F24 keyboard keys.
• kFBDKeyF13 up to kFBDKeyF24 added to FBDeviceKeyboardKey: C++ only, lets you capture the F13 to F24 keyboard keys.

Deprecated properties

• ColorMode of the FBEditColor
• MarkIn and MarkOut of the FBStoryClip

Changes specific to the Python API

• kFBEventPreShow and kFBEventTransportFpsChange enum values added to FBEventName: new enum values for the OnPreShow and OnTransportFpsChange callbacks.