Demo based on low polygon fractal terrains (the full grid is 512x512 and the local 256x256 grid is rendered). Fog is used to hide the local grid borders. The script takes 13kb (and gl-matrix lib more 50 kb) webxr-canyon-voyage.glitch.me
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. Because of virtual reality (motion) sickness I have to use very slow "boat" motion (therefore "voyage" not "racing"