Unity ARKit Blend shape object activator

BlendShapeObjectSwitcher.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.iOS;

public class BlendShapeObjectSwitcher : MonoBehaviour {

	private static float THRESHOLD = 0.4f;

	bool enabled = false;
	Dictionary<string, float> currentBlendShapes;
	float blendshapeValue = 0.0f;
	
	public string BlendShapeName = "";
	public GameObject ToggleObj;

	// Use this for initialization
	void Start () {
		UnityARSessionNativeInterface.ARFaceAnchorAddedEvent += FaceAdded;
		UnityARSessionNativeInterface.ARFaceAnchorUpdatedEvent += FaceUpdated;
		UnityARSessionNativeInterface.ARFaceAnchorRemovedEvent += FaceRemoved;
	}

	void FaceAdded (ARFaceAnchor anchorData)
	{
		enabled = true;
		currentBlendShapes = anchorData.blendShapes;
	}

	void FaceUpdated (ARFaceAnchor anchorData)
	{
		currentBlendShapes = anchorData.blendShapes;
	}

	void FaceRemoved (ARFaceAnchor anchorData)
	{
		enabled = false;
	}	

	// Update is called once per frame
	void Update ()
	{
		if(enabled)
		{
			if(currentBlendShapes.ContainsKey(BlendShapeName))
			{
				blendshapeValue = currentBlendShapes[BlendShapeName];

				if(blendshapeValue >= THRESHOLD)
				{
					ToggleObj.SetActive(true);
				}
				else
				{
					ToggleObj.SetActive(false);
				}
			}
		}	
	}
}