Compute COM, XCoM, BoS, and MoS from C3D marker data.
npx skills add https://github.com/Rukkha1024/replace_V3D --skill v3d-com-xcom-bos-mos
Please help me install this Agent Skill. Skill: v3d-com-xcom-bos-mos Source: https://github.com/Rukkha1024/replace_V3D/tree/main/.claude/skills/v3d-com-xcom-bos-mos Command: npx skills add https://github.com/Rukkha1024/replace_V3D --skill v3d-com-xcom-bos-mos
This Skill automates the computation of key biomechanical metrics like Center of Mass (COM), Extrapolated Center of Mass (XCoM), Base of Support (BoS), and Margin of Stability (MoS) from motion capture data, eliminating manual processing and ensuring consistency.
Use the v3d-com-xcom-bos-mos skill to process the C3D file located at '/path/to/trial.c3d' using the anthropometric data from '/path/to/subject.yaml' and event information from '/path/to/events.xlsm'.
High-intent search queries and answers about installing and using this skill.
You can calculate Margin of Stability from C3D files by using foot landmarks to define the Base of Support and applying Hof's inverted-pendulum model to find the signed minimum distance from the Extrapolated Center of Mass to the BoS boundary.
Yes, you can compute Base of Support without force plates by generating a BoS polygon directly from foot landmark markers contained in the C3D file.
Hof's inverted-pendulum model calculates the Extrapolated Center of Mass by incorporating the Center of Mass position and its velocity. This Skill uses a segment-centroid proxy for COM and applies this model to derive XCoM time series from C3D data.
Yes, you need anthropometric data including leg length and foot dimensions to compute COM and stability metrics. Optionally, event information from an Excel file can be supplied to precisely analyze perturbation trials.
The best way to automate Center of Mass calculation from C3D files is by using a segment-centroid proxy that processes whole-body marker data. This eliminates manual processing and ensures consistent biomechanical metric generation.
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