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In the new controls file (Iso_controls.xml), delete the ControlLinear element named "RightMuscle.excitation".Create a copy of the controls file (Tug_of_War_Millard_controls.xml) and name it "Iso_controls.xml".Expand the Millard2012EquilibriumMuscle element named "LeftMuscle" and set its default_activation property to 0.01. Expand the ForceSet element and remove the (entire) Millard2012EquilibriumMuscle element named "Ri ghtMuscle". In the model file (Tug_of_War_Millard_Iso.osim), change the Model name to "Tug_of_War_Millard_Iso".You may recognize the model components as categories shown in the Navigator Pane of the OpenSim GUI.Ĭreate a set of files for a single muscle simulation as follows: Within the OpenSimDocument element is a Model element consisting of several model components.

At the top of the file, you will find a block that indicates the presence of XML content, then an XML element called OpenSimDocument. Open the model file 'Tug_of_War_Millard_Iso.osim' in your favorite text editor. The value between the start and end tags can be a string, a number, or another XML element. An XML element consists of a start tag, a value, and an end tag. This model file contains the fix: Tug_of_War_Millard.osimĪn OpenSim model is created using a series of XML elements. In the Tug_of_War_Millard.osim file packaged with OpenSim 4.0 and 4.1, the activation_time_constant and deactivation_time_constant properties are erroneously within the MuscleFirstOrderActivationDynamicModel element move these two properties out of MuscleFirstOrderActivationDynamicModel and into Millard2012EquilibriumMuscle.