Is the floor in your 3D scene actually at Zero? If not you need to offset it in the Scene node in Aximmetry. Also, you’re using the second tracking puck on the floor to set the world zero from the Vive Mars system, right?

We are using the second tracking to set the world to Zero, but if we bring the camera near the ground plane, we can we swimming. Is Aximmetry designed to handle precision on that level?

What is the best thing to do in terms of calibration- and things to look out for in that process to eliminate this issue?

Aximmetry can handle absolute precision. The issue is either with the Vive tracking (are you using regular Vive or Vive Mars?) or the calibration. Make sure you’ve entered the correct sensor size and that the Vive is actually tracking correctly during the whole calibration procedure. If it looses tracking, the calibration results won’t be accurate. 

We're using Mars Vive.

The Vive tracking during the calibration process could be the issue. We had some difficulty with the sensors connecting/staying connected. It is frustrating that you don't always know if it's connected until the camera calibration process.

Hi,

Note, that if you use the Recenter option to set the world to zero by placing the Rover on the ground:
Then the ground floor will be actually offset by the height of the Rover and the Tracker, as the Recenter function takes the absolute position of the tracker.

Also, you can always do more than one calibration. Just to see if there is any difference between the values of the two calibrations, cause something went wrong during one of the calibrations.

Warmest regards,

Thank you! The delta head adjustment seems to have taken away a predominant amount of the swimming. We're working on fine tuning now.