FaceMapper_AutoSetup / Need UnityLiveCapture & NaughtyAttributes packages

FaceMapperAutoSetup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using NaughtyAttributes;
using Unity.LiveCapture.ARKitFaceCapture;
using Unity.LiveCapture.ARKitFaceCapture.DefaultMapper;
using UnityEngine;

public class FaceMapperAutoSetup : MonoBehaviour
{
    [SerializeField] DefaultFaceMapper _mapper;
    [SerializeField] string SkinnedMeshNameGo = "head";

    IEnumerable<string> AllARFaces => Enum.GetNames(typeof(FaceBlendShape)).Except(new[] { "Invalid" });

    // Mesh data
    SkinnedMeshRenderer Skin => (_mapper
            .GetType()
            .GetField("m_RigPrefab", BindingFlags.NonPublic | BindingFlags.Instance)
            .GetValue(_mapper) as GameObject)
        .transform
        .Find(SkinnedMeshNameGo)
        .GetComponent<SkinnedMeshRenderer>();

    // Face Data
    object Maps => _mapper.GetType().GetPrivateField("m_Maps").GetValue(_mapper); // List<RendererMapping>
    Array MapsEl => Maps.GetType().GetPrivateField("_items").GetValue(Maps) as Array;   // Array[RendererMapping]
    Array HeadBindings => MapsEl.GetValue(0)
        .GetType()
        .GetPrivateField("m_Bindings")
        .GetValue(MapsEl.GetValue(0)) as Array; // Binding[]

    IEnumerable<(object, FaceBlendShape, int)> GetBindings()
    {
        for (int i = 0; i < HeadBindings.Length; i++)
        {
            var el = HeadBindings.GetValue(i);  // Binding
            var type = el.GetType();
            FaceBlendShape face = (FaceBlendShape)(type.GetPrivateField("m_Location").GetValue(el));
            int faceIdx = (int)(type.GetPrivateField("m_ShapeIndex").GetValue(el));
            
            yield return (el, face, faceIdx);
        }
    }

    void SetBinding(object binding, int value) => binding.GetType().GetPrivateField("m_ShapeIndex").SetValue(binding, value);

    [Button]
    void AutoSetup()
    {
        var blendShape = Skin.sharedMesh.GetBlendShapeData();

        foreach (var el in GetBindings())
        {
            var txtlower = Enum.GetName(typeof(FaceBlendShape), el.Item2).ToLower();

            var rightBlendShapeIndex = blendShape.First(i => i.Item2 == txtlower).Item1;

            SetBinding(el.Item1, rightBlendShapeIndex);
        }
        
        UnityEditor.EditorUtility.SetDirty(_mapper);

    }
}


public static class MyExtension
{
    public static FieldInfo GetPrivateField(this Type @this, string n)
        => @this.GetField(n, BindingFlags.NonPublic | BindingFlags.Instance);

    public static IEnumerable<(int, string)> GetBlendShapeData(this Mesh @this)
    {
        (int, string)[] data = new (int, string)[@this.blendShapeCount];

        for (int i = 0; i < @this.blendShapeCount; i++)
        {
            data[i] = (i, @this.GetBlendShapeName(i).ToLower());
        }

        return data;
    }
}