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Welcome to the OpenSim Developer Week Wiki. The information in this Wiki page is intended to help you formulate a project that may both benefit from the OpenSim 4.0 API and is tractable for a one-week workshop. This wiki will be updated regularly so please check in as we get closer to the workshop.  

Important Dates 

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1. Implicit model formulation. OpenSim currently provides the model's dynamics as explicit differential equations, though implicit differential equations are preferable for some solution methods. During the workshop, participants could achieve the implicit formulation for just the multibody system without constraints.

2. Task-space controller. Implement an OpenSim Controller that causes a torque-actuated model to obey operational-space tasks. During the workshop, participants could achieve a working prototype for a small number of operational space tasks.

3. Patient-specific joint modeling from high-fidelity data. Joints in OpenSim are capable of capturing coupled translations and rotations as functions of limited degrees-of-freedom known as internal coordinates, which better match physiological joints than pins and sliders. In reality, it is the contact joint surfaces of bones, tension in ligaments, and other non-rigid structures such as menisci and capsules that dictate the specific path (or surface) of motion that a  joint provides under normal loads but these structures can be extremely difficult to model and simulate very slowly. On the other-hand researchers are using high-fidelity X-ray fluoroscopy, cine MRI, or bone pin measurements to characterize the kinematics of bones relative to one another during activities of daily living. The OpenSim Joint can directly capture/match the specific motion space as provided by high-fidelity data. During the workshop, available spatial kinematics of the two bones that connect to the joint of interest (such as the ankle, knee, or hip) from a high-fidelity source could be used to generate splines (or bicubic surface) such that the modeled joint reproduces nearly identical motion without having to model joint contact or other joint tissue forces.

4. Script based analysis pipeline. Automate your OpenSim workflow (e.g., IK -> RRA -> CMC) in either MATLAB or Python. This could be completed during the workshop for a subset of your data.

5. Modeling human-device interaction (e.g., robotic assistive device). Create a model of your device and add it to a musculoskeletal model. Write an OpenSim Controller class to control the device. During the workshop, participants could implement the Controller class and test it in simple scenarios.

Agenda

This is a five-day workshop. On the first day of the workshop, we will provide an overview of OpenSim 4.0, with discussions, guided exercises, and interactive lectures to introduce the new features. The second day will consist of guided exercises on contributing using GitHub and how you can incorporate collaboration and contribution to your project. Days three and four will be devoted to working on projects that you and other participants bring to the workshop. Day five will include group discussions and presentations about your workshop achievements and plans for wrapping up your development.

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