Frequently Asked Questions
All the technical details of VR Tracker are here ! If not, please ask us your questions directly at the bottom of the page ;)
- How can I contribute ?
You can help us by sharing your plugins and games you have done using our system ! We will showcase them and share them with the rest of the community on GitHub.
- How many player is VR Tracker compatible with ?
Our goal is to support at least 16 players by this summer (2017) !
- My cameras are very sensitive to sunlight, what should I do ?
Since the release 1.2 of the Gateway, cameras sensitivity can be adjusted from the Master Control. Open the “Dashboard”, wait for the camera list and click on the camera you want to change the sensitivity. You can choose the sensitivity, minimum blob size and maximum blob size.
- What is the minimal setup required ?
To get started you need at least :
– 1 gateway
– 2 cameras
– 1 tag
But we recommend at least 3 cameras and 2 tags to start having fun 🙂
- How many points do I need to calibrate the system ?
Even though 4 points is the minimal number of points for our calibration algorithm, this will give you a super bad calibration, with very low precision and in many cases almost no height tracking. You should use at least 16 non planar points. By non planar we mean in different plans (different heights).
We will change the calibration by this summer for a “wand calibration method“. It will improve the calibration a lot by taking hundreds of points instead of 4-16 !
- What is the GPIO port on the Tag for ?
The GPIO port allows you to connect sensors to the Tag and send those datas directly to your users through VR Tracker ecosystem. Imagine you want to make a LaserTag and need to track weapons : you need the weapon position and orientation but also a way to know when the user triggers that weapon. Well you can connect a button to the Tags GPIO port and receive that data in the same way you receive position and orientation. Have a look at this tutorial for more informations.
- Can I use a Tag on a weapon to create a LaserTag in VR ?
Of course ! We actually added nice features to our Tags just for this purpose : the IMU for orientation and a GPIO port.
- Which headsets are compatible with VR Tracker ?
VR Tracker outputs position and orientation data, then you can assigg them to anything ! The only problems you can encounter is interferences with an infrared light source. With headset like Oculus or OSVR, just make sure you are not using their tracking camera, and this way disable “constellation” tracking. For the HTC Vive, you cannot use VR Tracker because Vive is forcing to use the lighthouse.
- Is there orientation too ?
Sure ! A precise IMU in Tag is here to give you orientation data. Check the API to find out how to retrieve the Tag’s acceleration and orientation.
- What is the tracking precision ?
The precision depends on the distance to the cameras and the numbers of cameras currently tracking Tag. In a good setup it can be as low as 0.5mm. If you are trying to have a large scale tracking with only few cameras, the precision can go up to 5mm. We are talking about relative precision (if you are trying to measure distances with Tags for example). Concerning the absolute precision (which is the error between the real world calibration points and the 3D position from the Tag after calibration), it only depends on the calibration quality (number of points used). We are currently improving this by adding wand calibration.
- What is the Camera detection range ?
Even though in lab tests we could detect a Tag at up to 16 meters, we advice you to consider 7 meters top. The range can depend on light conditions, camera positioning and many other factors, which is why 7 meters is usually the maximal range to consider for stable tracking.
- How many camera do I need ?
First remember that to have a position, your Tag must be seen by at least two cameras. Also if you are using Tags on weapons or controllers, they can easily be covered by your body.
Knowing this, for an application such as a lasertag, you need at least a camera per 5 square meter. If you just intend to track users headsets, you can go down to a camera per 8 meter square.
- Can I use VR Tracker outside ?
Sadly, this is the limit of the system… It tracks infrared light to find the user’s position, but outside the sun emits so much IR light that it messes with the system. Maybe somebody will come up with a great idea to get around this problem, but we haven’t so far.
- What are the Camera Specs ?
The camera is a 5MP sensor, currently running at 50 FPS. The latest version has a 90° FOV, the ones ordered before March 2017 have a 80° FOV.
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