Space Calibrator with tracker smoothing

A fork of the 1.5.1 line of Space Calibrator, the SteamVR tool that lines up devices from one tracking system with another, with continuous calibration. This fork adds an optional one euro filter that smooths the calibrated trackers in place. No virtual devices, no second driver: games see the same trackers they always did, just steadier at rest.

What smoothing does

The driver already rewrites every target-space pose on its way into SteamVR to apply the calibration. With smoothing on, it first runs a one euro filter on the tracker's position, in the tracker's own space, before the calibration transform is applied. Rotation passes through untouched, so aim never lags. SteamVR's own prediction is scaled back by the same amount, which is what takes the overshoot off a twitchy tracker. Continuous calibration corrections never enter the filter, so they behave exactly as before.

Controls live in the overlay under "Tracker smoothing":

• Smoothing: 0 to 100%, where 0 is off. Higher is calmer while a tracker sits still. The filter opens up on movement at every setting, so real motion trails by under 15 mm even at 100%.
• Also smooth controllers: off by default; controller input is latency sensitive.
• A live table shows raw versus smoothed frame-to-frame movement per device, and how often the filter restarted after a gap or a jump.

Smoothing applies to devices in the calibrated target space, so a profile has to be active.

Install from a release

1. Close SteamVR.
2. Unzip the release anywhere permanent.
3. Run install.ps1 from the unzipped folder. It registers the driver folder with SteamVR, unregisters any other copy of the 01spacecalibrator driver (including the Steam build), turns on activateMultipleDrivers, and registers the overlay so it autolaunches with SteamVR.
4. Start SteamVR. The overlay appears in the dashboard as usual.

Installed copies check GitHub for a newer release when the overlay starts (beta builds see betas, stable builds only stable releases) and ask before updating. Accepting downloads the zip, checks its SHA-256, and swaps the files after SteamVR closes. Skip remembers that version; the Settings tab has the startup toggle and a "Check now" button. Dev builds never check.

Do not launch the Steam copy of Space Calibrator while this one is registered; two copies of the driver would both rewrite poses. uninstall.ps1 reverses the registration.

Build from source

Requirements: Visual Studio 2022 or newer with the C++ workload, CMake 3.24 or newer, git.

git clone --recurse-submodules https://github.com/RealWhyKnot/OpenVR-SpaceCalibrator.git
cd OpenVR-SpaceCalibrator
./build.ps1

build.ps1 stamps version.txt, enables the repo git hooks, configures into build/, builds Release, and runs the tests. build.ps1 -Channel beta or -Channel release sets the channel baked into the version line. Outputs: build/01spacecalibrator (driver) and build/artifacts/Release (overlay). scripts/install.ps1 with no arguments registers those build outputs directly.

lint.ps1 -Check runs clang-format and clang-tidy over src/ and tests/; lint.ps1 without -Check applies the fixes.

Releases

Tags of the form vYYYY.M.D.N publish a release; vYYYY.M.D.N-beta publishes a prerelease. The release workflow builds, tests, zips the driver and overlay with the install scripts, attaches a SHA-256 file, and writes the notes from the conventional commit subjects since the previous tag. A nightly job tags a beta whenever main moved since the last tag and publishes it with the same release workflow.

License

MIT. See LICENSE and NOTICE.