Instanced Butterflies animation.
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.
Transformation matrix "instancing" is based on webgl2fundamentals: webgl-instanced-drawing. EXT_texture_filter_anisotropic extension and gl.LINEAR_MIPMAP_LINEAR texture filtering mode are used.
WebXR samples     updated 12 Apr 2020