@pmndrs/xr/dist/misc.js

VR/AR for threejs

import { Quaternion, Vector3 } from 'three';
const vectorHelper = new Vector3();
const directionHelper = new Vector3();
const positionHelper = new Vector3();
const quaternionHelper = new Quaternion();
export function isFacingCamera(camera, object, direction, angle) {
    //compute object world direction -> directionHelper
    object.getWorldQuaternion(quaternionHelper);
    directionHelper.copy(direction).applyQuaternion(quaternionHelper);
    //compute guardToCamera direction (guard - camera) -> vectorHelper
    object.getWorldPosition(positionHelper);
    camera.getWorldPosition(vectorHelper);
    vectorHelper.sub(positionHelper);
    //compute the angle between guardToCamera and object world direction
    return vectorHelper.angleTo(directionHelper) < angle / 2;
}
export function isAppleVisionPro() {
    return navigator.userAgent.includes('Macintosh') && navigator.xr != null;
}