You sit at a desk. Look down: your hands rest on the desk, and a small animal is walking on your left hand.
To choose the animal, look at the menu on the wall in front of you and tap the screen (in Cardboard: the viewer's button), or click the button with the mouse. Choosing by only looking (gaze dwell) can be switched on under "Choosing buttons" below.
In the viewer: tap the screen (or the Cardboard button) while looking at nothing to re-center the view. To come back here, look straight down and choose Menu, or press and hold the screen for about a second. On screen, use the round button at the right edge.
This link came with its own viewer settings. They have been loaded.
Tap: look at a button (the small ring shows where you look), then tap the screen, or press the viewer's button. On a computer, click the button with the mouse. Gaze dwell: keep looking at the button until the blue line is full. A longer dwell time means fewer buttons chosen by accident.
Most viewers have a QR code printed on them. It contains the values below.
Distortion uses the same formula as Google's Cardboard SDK: a point at distance r from the lens center appears at r·(1 + k1·r² + k2·r⁴). Color fringe correction shrinks red and enlarges blue by this fraction (or the reverse if negative), to cancel colored edges.
The distance from the point your head turns around to your eyes. About 14 cm is a real neck. Longer values make looking down also move your head forward and down, as if leaning over the desk. 0 turns the neck model off.
With the grid on, each eye sees lines every 0.1 (tangent units) and yellow rings every 10°. When the lens values are right, the lines look straight and evenly spaced through the lens, and the two eyes' grids merge into one without effort. A red cross marks each lens center.
Prediction guesses where your head will be when the image appears. Too little feels laggy; too much makes the view overshoot when you stop turning.
Removes fine shaking when you move slowly or hold still. It switches itself off during fast turns, so it adds little delay there.
Keeps "straight ahead" from slowly turning. The compass only nudges the view, at most a degree or two per second, so it never jumps. Readings are ignored while the magnetic field looks disturbed (metal, magnets or electronics nearby). Turn this off if your viewer has a magnet button.
Chrome limits motion sensors to 60 Hz, whatever is asked for. The numbers in the viewer show the real rate. Own fusion reads the gyroscope directly, so prediction uses the measured turning speed. Gravity correction keeps the tilt from drifting: higher corrects faster but lets head bumps shake the view.
Leave this off when sharing with people who use other phones.
Hold a bank card (or any ID card of the same size, 85.6 × 54.0 mm) flat against the screen. Change the value until the white frame matches the card's edges exactly.
Point the camera at the QR code on your viewer.
After tapping, put the phone in the viewer.