VRControls has a
userHeight property that places the camera a given height (usually) above the origin in “standing” mode when the
VRDisplay doesn’t provide a standing matrix.
WebVRManager doesn’t appear to have an equivalent adjustment, so headsets that do not have roomscale (i.e. anything other than Vive) place the head at or near the floor. Since
WebVRManager.getCamera() sets the position of the camera inside of
WebGLRenderer.render() it’s difficult if not impossible to make that adjustment another way.