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What's available?

  • Instantiate and run tools from setup files or programmatically. 
  • Perform batch processing of common workflows (e.g., inverse kinematics, computed muscle control, EMG-driven simulation).
  • Utilize the OpenSim API without the overhead of learning to program in C++ and setting up a development environment.
  • Write "main" programs similar to those written by C++ developers, while taking advantage of the many open-source Matlab/Python packages for data processing, statistics, machine learning, etc. 
  • Access common SimTK/Simbody numeric types (e.g., Vec3, Vector, Mat33, State, Inertia) and a limited subset of Simbody multibody calculations.
  • Access to the OpenSim API to create and simulate models.
  • Use the Simbody visualizer.


  • In general, cannot create new component (e.g., a custom muscle; though there are some exceptions).
  • Cannot create plugins for use through the GUI or command-line.
  • Not all Simbody classes are available.
  • In Matlab/Python, there’s no access to OpenSim's plotter (use Matlab/Python native plotter) or visualizer (use the Simbody visualizer).
  • Some internal SimTK classes (that belong to the SimTK namespace and simbody internals) are not available (e.g., integrators).


  • Matlab
  • Python
  • The scripting shell in the OpenSim GUI (which is a Jython interpreter embedded in the application)


The sections below outline how to get started with scripting and describe the available functionality.