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Hi,

Is there any easy way to extract the individual muscle point trajectories for a defined motion of a model?

Are they stored in a file either temporarily or permanently?

Hi Simon:

All the muscle points are in the .osim model file and are defined to the body to which the are attached. If you want to get the trajectories of these points during a simulation, you can add a "PointsKinematics" in the "Analyze" (under the Tools menu).

Under the Analyses tab you can add a PointsKinematics (amongst others), which will add it to the list of analyses to be run. Highlight it in the list then click Edit to be able to set the point you want to output (define the body, the name of the point and its coordinates on the body, which is in the .osim file). If you have multiple points you have to enter all points as a separate analysis by adding them to the Analyses list. The output will be files named something like <point_name>_PointsKinematics.sto. The main settings and Actuators/Loads tabs you define just like you would in running Forward Dynamics.

Hope this helps,
Ajay