Camera view
Camera maps over this device's rear camera. Calibrate projects dots and finds them in the camera image; Tap dots is the fallback for bright rooms.
The calibration holds only while the device stays exactly where it was. Use a tripod or rest it next to the projector lens, and Recalibrate after moving it.
Mapping is exact on the surface the dots land on. Corners on a 3D object nearer or farther than that surface (a cube's front edge) are off by parallax, which grows with the distance between the device and the projector lens. Keep them close and check the result on the object.