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Request help using OpenSim

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  • Request help using OpenSim


    Currently, the Physical Activity Lab at Colorado State University is
    attempting to make a msculoskeletal model utilizing OpenSims simulation
    software. We recently collected kinematic data using a motion capturing
    system and I am trying to create a scaled model and motion file (.MOT) using
    this information. We are new at this and need some guidance on the
    following topics:

    1. When scaling a current model (one that I've downloaded as an example),
    where can I find the origin of that model in order to convert the lab
    coordinates to the model coordinates?
    2. Am I corrent when assuming that the location of each marker that I
    specify in the MarkerSet.xml file needs to be scaled to the COM of its
    respective segment?
    3. Some models use "bodies" as bones and not actual segments (ie, instead of
    using the foot as a "body", it will use the talus or calcaneous). How
    should I scale the coordinates of different markers to these bones? Or
    should I use a different segment?
    4. Do you have any advice on what markers are crucial in obtaining
    simulation of a walking lower extreminty? For instance, what markers on the
    torso would you recommend? We currently have markers on the right and left
    ASIS, T1, T10, and sternum. Would you recommend using all of these in our

    Any input you could provide would be greatly appreciated and I will post a
    summary of responses once I have everything figured out.

    Robby Ketchell
    Colorado State University
    Department of Health and Exercise Science
    Fort Collins, CO