updateMesh() {

		// XR Joints
		const XRJoints = this.controller.joints;

		for ( let i = 0; i < this.bones.length; i ++ ) {

			const bone = this.bones[ i ];

			if ( bone ) {

				const XRJoint = XRJoints[ bone.jointName ];

				if ( XRJoint.visible ) {

					const position = XRJoint.position;

					bone.position.copy( position );
					bone.quaternion.copy( XRJoint.quaternion );
					// bone.scale.setScalar( XRJoint.jointRadius || defaultRadius );

				}

			}

		}

	}
Updates the mesh based on the tracked XR joints data.