Discussion and Support for the OptiTrack, SmartNav and TrackIR brands by NaturalPoint

Skeleton bone position

NatNet, VRPN, TrackD, and Plugins

by dario.turchi » Tue Aug 08, 2017 10:40 am

In the data streamed by Motive, the position of the bone to which exact point makes reference ? The geometric centre ? one of the extremities ? It seems like a stupid question, but I could not find an answer to this question in the documentation.
For generic rigid bodies the position makes reference to the "pivot point", which seems to be the geometric centre of the markers, but does this hold also for skeleton bones ?
Thank you
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by steven.andrews » Tue Aug 08, 2017 11:31 am

Hello dario.turchi,

Thank you for reaching out to the community regarding your question.
The pivot point for any bone is located where its parent bone ends. For example, the pivot point for the forearm is located at the elbow.

In Motive, this pivot point is represented by a diamond when the skeleton is shown, or by a ball joint if Segments are shown.
Forearm_Pivot_At_Elbow.JPG (42.53 KiB) Viewed 374 times

I hope you find this information to be useful. If you require any further assistance, please feel free to reach out to me through your open Support ticket.

Steven Andrews
OptiTrack | Senior Customer Support Engineer
NaturalPoint Employee
NaturalPoint Employee
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