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Assets/Prefabs/FaceBlendShapes.prefab

   m_Script: {fileID: 11500000, guid: 77136493c3caf4805ac5a602f75072e0, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  coefficientScale: 100
-  skinnedMeshRenderer: {fileID: 137740007780104604}
+  m_CoefficientScale: 100
+  m_SkinnedMeshRenderer: {fileID: 137740007780104604}
 --- !u!1 &1342913298729328
 GameObject:
   m_ObjectHideFlags: 0

Assets/Scripts/ARFaceArkitBlendShapeVisualizer.cs

 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Experimental.XR;
+using UnityEngine.Serialization;
 using UnityEngine.XR.ARFoundation;
 using UnityEngine.XR.ARKit;
 
 public class ARFaceArkitBlendShapeVisualizer : MonoBehaviour
 {
     [SerializeField]
-    float coefficientScale = 100.0f;
+    float m_CoefficientScale = 100.0f;
-    SkinnedMeshRenderer skinnedMeshRenderer = null;
+    SkinnedMeshRenderer m_SkinnedMeshRenderer;
-    ARKitFaceSubsystem arkitFaceSubsystem;
+    ARKitFaceSubsystem m_ArkitFaceSubsystem;
-    
+
+    public SkinnedMeshRenderer skinnedMeshRenderer
+    {
+        get
+        {
+            return m_SkinnedMeshRenderer;
+        }
+        set
+        {
+            m_SkinnedMeshRenderer = value;
+            CreateFeatureBlendMapping();
+        }
+    }
+
+    public float coefficientScale
+    {
+        get { return m_CoefficientScale; }
+        set { m_CoefficientScale = value; }
+    }
+
     void Awake()
     {
         s_FaceArkitBlendShapeCoefficients = new List<XRFaceArkitBlendShapeCoefficient>();
 
     void OnEnable()
     {
-        arkitFaceSubsystem = (ARKitFaceSubsystem) ARSubsystemManager.faceSubsystem;
-        if (arkitFaceSubsystem == null )
+        m_ArkitFaceSubsystem = (ARKitFaceSubsystem) ARSubsystemManager.faceSubsystem;
+        if (m_ArkitFaceSubsystem == null )
         {
             return;
         }
     
     void UpdateFaceFeatures()
     {
-        if (skinnedMeshRenderer == null || !skinnedMeshRenderer.enabled)
+        if (skinnedMeshRenderer == null || !skinnedMeshRenderer.enabled || skinnedMeshRenderer.sharedMesh == null)
-        if (!arkitFaceSubsystem.TryGetFaceARKitBlendShapeCoefficients(m_Face.xrFace.trackableId,s_FaceArkitBlendShapeCoefficients))
+        if (!m_ArkitFaceSubsystem.TryGetFaceARKitBlendShapeCoefficients(m_Face.xrFace.trackableId,s_FaceArkitBlendShapeCoefficients))
         {
             return;
         }