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Why two tracking systems need alignment
A camera-based headset estimates its position and orientation in a coordinate frame created by its inside-out tracking system. Lighthouse devices, such as compatible controllers or Vive Trackers, report their poses in the Lighthouse/SteamVR frame. A position reported in one frame cannot be treated as a position in the other without a mapping between them.
Mixed-playspace alignment calculates that mapping so software can express tracked devices together in a usable playspace. The headset cameras and base stations are not directly calibrating one another; a shared tracked device, observed by both systems, provides the correspondence used to relate their frames.
What calibration does
- Start both tracking systems. The headset needs a valid camera-based pose, and the Lighthouse device needs a valid SteamVR pose.
- Select corresponding devices. Space Calibrator documentation describes choosing devices from a reference space and a target space. The precise device roles and controls depend on the installed release or fork, so follow its current instructions: Space Calibrator project and maintained fork.
- Collect paired observations. Hold the corresponding devices together as instructed and move them through varied positions and orientations. Their observed poses provide information about how the two coordinate frames relate. Keep the devices physically together during the collection process; otherwise the observations no longer represent the same location.
- Apply the estimated transform. In practical terms, the calibration estimates a rotation and translation mapping between the frames. Software applies that mapping to make devices from both systems appear in the same playspace.
Exact interface steps, supported combinations, and collection guidance vary by software build. The project documentation does not establish one universal sample count, movement pattern, calibration time, or guaranteed accuracy, so avoid assuming a specific value applies to every setup.
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Alignment is not Lighthouse sensor calibration
These are separate operations. Mixed-playspace alignment relates the coordinate frame of one tracking system to another. Lighthouse device optical calibration describes the locations, orientations, and channel mapping of sensors on a tracked object. Valve’s OpenVR Lighthouse device documentation explains that SteamVR uses the known sensor geometry to resolve an object’s pose.
One-time alignment versus continuous calibration
Some Space Calibrator forks offer continuous calibration, but the maintained fork labels the capability experimental. Its documented workflow requires a tracker rigidly attached to the headset so that the Lighthouse system can provide a corresponding observation as the headset moves. This is a capability of particular software forks, not a universal SteamVR feature.
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| Approach | Headset-mounted Lighthouse tracker | What happens after calibration | Important qualification |
|---|---|---|---|
| Initial or one-time alignment | Not established as a general requirement by the cited project instructions; follow the exact workflow for your release or fork. | The estimated transform is applied to combine the tracking spaces. A change to a tracking space or noticeable drift may mean calibration needs to be repeated. | Device selection and setup depend on the software workflow. |
| Continuous calibration | Required by the maintained fork’s documented workflow. | The headset-mounted tracker supplies Lighthouse observations as the headset moves, allowing the software to refine alignment. | The maintained fork describes this feature as experimental; support and behavior vary. |
The available documentation does not establish a universal performance ranking between these approaches. Whether continuous calibration is practical depends on headset and fork support, the mount staying rigid, what happens when either playspace changes or resets, and the setup required.
Why alignment can look wrong or drift
A calibration depends on correctly selected devices and valid poses from both tracking systems. Check that the devices are the intended reference and target, both systems are tracking reliably, and any headset-mounted tracker has not shifted. A change or reset to either tracking space can invalidate the prior relationship; the Space Calibrator project identifies space changes and noticeable drift as reasons to recalibrate.
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If the Lighthouse side appears unreliable, Valve’s general SteamVR troubleshooting guidance includes checking base-station firmware and testing a station in A mode: SteamVR Base Station troubleshooting. These checks are not a complete diagnosis for every headset, base station, or software fork.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check compatibility before choosing a workflow
Support depends on the headset, Lighthouse hardware, SteamVR setup, and the particular Space Calibrator release or fork. A compatible Lighthouse-tracked controller or Vive Tracker may serve as a device in initial calibration, depending on the workflow. A Vive Tracker is specifically required for the cited maintained fork’s continuous-calibration setup, but that does not establish compatibility for every tracker model or headset. Confirm the current instructions for the exact combination you plan to use.
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