Hau kun's points VR animation demo.
See Twitter@Hau_kun
and WebGL test.
Tested on Oculus Go (with touchpad) and VR BOX2 (with joystick).
For tests on a desktop (Windows 10 + Chrome) the "inline" webxr session and
A,S,D,W,↑,↓ keys for navigation are used.
x = tan(.2*r*cos(t + r + d))*d, // tan(x) → x(1 + x2)
y = sin(t - r + d)*d,
z = r*sin(t + r + d)*d*.0012, // is added for VR.