Measurement probe tool utilizes the precise tracking of OptiTrack mocap systems and allows you to measure 3D locations within a capture volume. A probe with an attached rigid body is included with the purchased measurement kit. By looking at the markers on the rigid body, Motive calculates a precise x-y-z location of the probe tip, and it allows you to collect 3D samples in real-time with sub-millimeter accuracy. For the most precise calculation, a probe calibration process is required. Once the probe is calibrated, it can be used to sample single points or multiple samples to compute distance or the angle between sampled 3D coordinates.
Measurement kit includes:
This section provides detailed steps on how to create and use the measurement probe. Please make sure the camera volume has been calibrated successfully before creating the probe. System calibration is important on the accuracy of marker tracking, and it will directly affect the probe measurements.
Note: Custom Probes
As the samples are collected, their coordinate data will be written out into the CSV files automatically into the OptiTrack documents folder which is located in the following directory: C:\Users\[Current User]\Documents\OptiTrack. 3D positions for all of the collected measurements and their respective RMSE error values along with distances between each consecutive sample point will be saved in this file.
Also, If needed, you can trigger Motive to export the collected sample coordinate data into a designated directory. To do this, simply click on the export option on the Probe pane.
The location of the probe tip can also be streamed into another application in real-time. You can do this by data-streaming the probe rigid body position via NatNet. Once calibrated, the pivot point of the rigid body gets positioned precisely at the tip of the probe. The location of a pivot point is represented by the corresponding rigid body x-y-z position, and it can be referenced to find out where the probe tip is located.