calculation for marker position

[weifeng0715]

I have attached the data file. Can anyone help me with the calculation for marker position?
Because I could calculate the trajectories with any point on the rigid body.

Theoretically, I could calculate the trajectory for marker1 in rigidbody1 with the information of rigidbody rotation (columns 3-5) and position (column 7-9) and the initial position of marker1 (row 8 in columns 11-13)? The problem is how to do that?

[steven.andrews]

Hi weifeng0715,

Thank you for sharing your question here and also within our Support team.

Unfortunately, information regarding the algorithms that are used to calculate marker positions is not something we are able to share. This is an aspect of the software that is proprietary information.

If you look at the Rigid Body Properties, in Motive, you will see marker positions relative to the rigid body's pivot point.
You should be able to use this information to calculate the marker position in relation to the rigid body, but I do not have information on the math that would be involved for taking the rigid body's current orientation into account.

Marker positions are also provided in the CSV file directly.

Best,
Steven
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Steven Andrews
OptiTrack | Senior Customer Support Engineer