How to Use the GUI

The computed muscle control tool is accessed by selecting Tools → Computed Muscle Control… from the OpenSim main menu bar (figure below). Like all tools, the operations performed by the computed muscle control tool apply to the current model. The name of the current model is shown in bold in the Navigator. See chapters Opening, Closing, and Using the Navigator Window for information on opening models and making a particular model current.

The Computed Muscle Control (CMC) Tool is controlled by a window with three tabbed panes (figure below). This window is the same as that used for RRA (see Residual Reduction Algorithm).

  • The Main Settings pane is used to specify parameters related to the input kinematics of the current model, the time range for the analysis, and the output of the results.

  • The Actuators and External Loads pane is used to specify additional actuators, such as residual and reserve actuators.

  • The external loads and integrator settings are specified in the same manner as in Forward Dynamics.


Actuators and External Loads Pane

The Actuators and External Loads pane is used to specify parameters relating to the actuators appended to the model and the external loads applied to the model during CMC. The pane is organized into two main sections entitled Actuators and External Loads.

  • The section for Actuators displays editable information that allows you to specify additional force set files that specify forces to supplement the muscles of the model.

  • You may use the  button to edit the list of force set files describing the forces to be appended to or replaced in the model.

  •  The information in the External Loads section is optional. 
  • If checked, the section displays information so that you can specify the external loads applied to the model. 
  • Please refer to the section on ExternalLoads specification under the How to Use the Inverse Dynamics Tool for more details.

Command-line Execution

CMC is run using the command cmc -S <setup file> where <setup file> is the name of the setup file, for example, 

cmc -S subject01_Setup_CMC.xml 



Next: CMC Settings Files and XML Tag Definitions

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