var tl1 = this.cameraEntity.camera.screenToWorld(0, 0, 1);
var br1 = this.cameraEntity.camera.screenToWorld(window.innerWidth, window.innerHeight, 1);
var d1 = new pc.Vec3().sub2(tl1, br1);
var tl2 = window.camera.screenToWorld(0, 0, 1);
var br2 = window.camera.screenToWorld(window.innerWidth, window.innerHeight, 1);
var d2 = new pc.Vec3().sub2(tl2, br2);
XR camera: [-79.5, 119.3, -23.3]
Not XR camera: [-0.48, 0.828, 0]