Main Page → Skeleton Tracking → 6 Rigidbody Skeleton Markerset
This page provides instructions on how to use the 6-Rigid Body skeleton markerset for full-body skeleton tracking.
The 6 Rigid Body skeleton feature is not exposed in Motive 2.0. To access this skeleton template, please contact our support.
The 6 Rigidbody Skeleton markerset allows users to use just rigid bodies to establish full body skeleton tracking. A total of six rigid bodies are attached at specific locations of the subject and Motive solves the entire skeleton through inverse kinematics. The rigid bodies are attached to the head, left-hand, right-hand, hip, left-foot, and right-foot, and then the pivot point of those rigid bodies needs be translated over to the corresponding joints.
Step 1) Prepare 6 rigid bodies with markers.
Step 2) Attach rigid bodies at the following locations:
Step 3) Make sure the rigid bodies are securely attached.
First of all, define rigid body assets for all of the attached rigid bodies.
Name the rigid bodies with the following syntax:
Now you need to position the rigid body pivot points. Use the Gizmo tool and translate the rigid body pivot points so that each pivot point is located at its respective parent joint axis. Pivot point of the head rigid body must be placed over the head/neck joints, the hip rigid body must have its pivot point at the pelvis center, pivot point of the left/right hand rigid bodies must be placed over the wrist joints, and the left/right foot rigid bodies must have its pivot points over the ankle joints, as shown in the image below.
Orient the rigid body pivot points so that all of its z-axis is facing in forward-direction. This can be done easily using the Rigid Body pane. Ask the subject to face towards the positive-z direction (determined by the global coordinate system) and use the Edit tab on the Rigid Body pane to reset the orientations of the each rigid body. This will align the rigid body orientation with the global coordinate axis, making the z-axis direct forward.
The rigid body pivot point should be positioned and oriented something like the image below.
Open the Skeleton pane and select the 6 Rigidbody Skeleton markerset. Name the skeleton that matches the prefix given to the rigid bodies.
Select all six rigid bodies and press "Create" on the Skeleton pane.