Author: <Hyunhee Lee> Email: lee67@unlv.nevada.edu
Date: Last modified on <05/08/17>
Keywords: <Motion capture, Rigid Body, Export data, Position data, Velocity data>

This picture show the “Arena” software program interface for capturing the “dots” motion. The blue 3D area is the capture volume which means dots are tracked only inside of that volume. It provides the position and orientation data about dots especially rigid body. This tutorial will explain about how to get position and velocity data.

This is a tutorial about getting position & velocity data from Optitrack Motion Capture system. If you are not familiar to use “Arena” which is Optitrack Motion Capture system software, Please take look at up the “Optitrack Motion Capture System Setup Guide” http://daslhub.org/unlv/wiki/doku.php?id=optitrack_motion_capture_system_setup_guide

Once you know how to record the “dots” movement, you can get the position data through “Arena” software program. But, you need to use other tool(e.g. matlab or excel) for calculating velocity.

* Experience about “Arena” software.
* Know how to get velocity data from position data.

The rest of this tutorial is presented as follows:

• Create Rigid Body
• Trajectorize
• Position data
• Export data
• Acquire velocity data

In order to get the position and orientation data through “Arena”, The Rigid body should be created for tracking the motion. There is one condition in order to create the rigid body. When you capture the motion, at least 3 dots should be used for motion inside of capture volume. Because when you try to create the Rigid body using “Wizards”, it requires you at least 3 dots in the captured video.

Step 1. See the menu on the top and click the “Wizards” and go to click “Rigid Body” and click “Next”.

Step 2. Click the bottom option and find out video that you recorded and click “Next”.

Step 3. Drag or click between 3~5 dots that you want to create for rigid body.

Step 4. Gives name for rigid body and click the “Create” button on right hand side and click “Next”.

Step 5. You need to set the “Origin” of rigid body. Either way, you can choose one of the dots of rigid body or center of rigid body and click “Next”.

Step 6. If you want to attach the “3D polygon” in rigid body, you can choose one of the shape. If you do not want to attach just leave it.