VREffect.js: unwanted ghosting occurs when objects are added to the camera

[skezo]

Issue
When adding an object (e.g. cube) to the camera while VREffect.js is active ghosting will occur on the object when the camera moves. This happens with master and dev versions (r.72) of Three.js and VREffect.js

To see the issue in action visit: http://misalabs.azurewebsites.net/ghosting/index.html using iPhone (iOS 8+ safari) or Android 4.4+ (Chrome). Press the "Cardboard" icon to activate VR mode. The live example is using webvr-manager but the issue can be recreated using the below code.

var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
document.body.appendChild(renderer.domElement);

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.3, 10000);
//Add camera to scene
scene.add(camera)

// Apply VR headset positional data to camera.
var controls = new THREE.VRControls(camera);

// Apply VR rendering to renderer.
var effect = new THREE.VREffect(renderer);
effect.setSize(window.innerWidth, window.innerHeight);

// Create 3D object to attach to camera
var geometry = new THREE.BoxGeometry(0.5, 0.5, 0.5);
var material = new THREE.MeshNormalMaterial();
var cube = new THREE.Mesh(geometry, material);
cube.position.z = -3;

// Add cube to three.js camera
camera.add(cube);

//Animation Loop
function animate(timestamp) {
requestAnimationFrame(animate);
controls.update();
effect.render(scene, camera);
}
animate();

Expected outcome
The object added to the camera should appear fixed to the camera with no ghosting effect present while moving the camera.

Workaround:
If I add camera.updateMatrixWorld() before the effect.render(scene, camera) in the callback of the requestAnimationFrame() method the ghosting stops. For example:

//Animation Loop
function animate(timestamp) {
requestAnimationFrame(animate);
controls.update();
camera.updateMatrixWorld();
effect.render(scene, camera); 
}
animate();

To see the workaround in action visit: http://misalabs.azurewebsites.net/ghosting/no-ghosting.html
using iPhone (iOS 8 safari) or Android 4.4+ (Chrome). Press the "Cardboard" icon to activate VR mode. The live example is using webvr-manager but the workaround can be recreated using the above code.

[WestLangley]

Yes. VREffect.render() is accessing camera.matrixWorld() without first updating it.

The proper fix is to add a call to camera.updateMatrixWorld() within VREffect.render(), instead.

However, this issue should be automatically resolved when #7019 is merged, and changes to VREffect.render() should not be required.

[brianchirls]

I see #7019 has been merged. Should this one be closed? Can someone confirm it's fixed?