recursion number= speed=

Cubic fractal sponge. See for comments WebGL Tetrahedral sponge. You can set a new recursion number value (for N = 5 there are 32768 points, N < 7).
Tested on Oculus Go (with touchpad) and VR BOX2 (with joystick). For tests on a desktop (Windows 10 + Chrome) the "inline" webxr session are used.
WebXR samples     updated 6 July 2020