Biomechanics Markersets

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Biomechanical markerset marker placements: Biomech (57)

In Motive: Body, there are following skeleton markersets for biomechanics tracking applications. When attaching the markers, reference the skeleton avatar from the Skeleton Pane for relative locations. Then refer to the corresponding markerset pages, or related reference materials, for additional descriptions on where each marker must be placed on the subject.


Biomechnical Analysis

Motive is capable of auto-labeling markers on the skeleton markersets with stable tracking and a rough representation of the joint angles and bone locations can be derived from it. Biomechanical analysis, however, requires advanced computations in order to obtain most accurate biomechanical data. To do so, tracking data of labeled 3D markers need to be pipelined down to a biomechanical analysis software (Visual3D or The MotionMonitor) for further analysis. Tracking data can either be exported from Motive and imported onto the software or be live-streamed from Motive.



Asymmetry is the key to avoiding the congruency for tracking multiple markersets. When there are more than one similar marker arrangements in the volume, marker labels may be confused. Thus, it is beneficial to place segment makers — joint markers must always be placed on anatomical landmarks — in asymmetrical positions for similar rigid bodies and skeletal segments. This provides a clear distinction between two similar arrangements. Furthermore, avoid placing markers in a symmetrical shape within the segment as well. For example, a perfect square marker arrangement will have ambiguous orientation and frequent mislabels may occur throughout the capture. Instead, follow the rule of thumb of placing the less critical markers in asymmetrical arrangements.