Headset Calibration Troubleshooting (Unity)

Fixes for common AR 51 Headset Calibration problems, starting with what the wearer sees.

In the headset

What you see	What to do
The panel says "Step into the capture area"	Make sure the AR 51 system is running and sees you — your avatar should appear. Check the headset is on the same network.
"Walk a few steps so the system can find you" stays	Walk around and turn your head a little. With several people in the room, it needs a few steps to know which one is you.
"Headset tracking lost"	This is the headset's own tracking: light the room and check the boundary is set.
Avatar shifted to one side or rotated	Stand still for a second looking ahead, then walk a few steps.
The room slowly turns at the start	Normal for the first seconds; it settles after a few steps.
It follows the wrong person	The wearer walks and turns their head. If it persists, call ResetCalibration().

In Unity and builds

What you see	What to do
Build stops with "AR51 SDK project validation failed"	Select the AR51.Unity.SDK object and press Fix on each item in the Service Manager inspector.
Standalone build connects, then nothing arrives	link.xml is missing from Assets — see Build it yourself, step 5.
Nothing lines up at all, no hints	The Headset Calibrator isn't in the scene, or the scene has no camera tagged MainCamera — the Console shows a warning.

See Tips for the wearer for the do's and don'ts that prevent most of these.