$ git clone https://github.com/homuler/MediaPipeUnityPlugin.git
$ cd MediaPipeUnityPlugin

$ make cpu

# ---------------------
# Linuxの場合はGPUモードも可
$ make gpu

# Androidで動かしたい場合
$ make android_arm

# ライブラリ・モデルファイルをアセットフォルダに配置してくれる
$ make install

namespace Mediapipe {
  public class IrisTrackingAnnotationController : AnnotationController {
    [SerializeField] GameObject irisPrefab = null;
    [SerializeField] GameObject faceLandmarkListPrefab = null;
    [SerializeField] GameObject faceRectPrefab = null;
    [SerializeField] GameObject faceDetectionsPrefab = null;

    /* ------------------- 追加 ------------------- */
    private MeshFilter meshFilter; // オブジェクトのMeshFilter
    private Mesh faceMesh; // オブジェクトのMesh
    private List<Vector3> vertextList = new List<Vector3>(); // Meshの頂点の座標リスト
    /* ------------------------------------------- */

    /* ~ 省略 ~ */

    void Awake() {
      leftIrisAnnotation = Instantiate(irisPrefab);
      rightIrisAnnotation = Instantiate(irisPrefab);
      faceLandmarkListAnnotation = Instantiate(faceLandmarkListPrefab);
      faceRectAnnotation = Instantiate(faceRectPrefab);
      faceDetectionsAnnotation = Instantiate(faceDetectionsPrefab);

      /* ------------------- 追加 ------------------- */
      meshFilter = GameObject.Find("default").GetComponent<MeshFilter>(); // defaultオブジェクトからMeshFilterを取得
      faceMesh = meshFilter.mesh; // Meshをセット
      vertextList.AddRange(faceMesh.vertices); // Meshから頂点座標リストを取得
      /* ------------------------------------------- */

      /* ~ 省略 ~ */

    public void Draw(Transform screenTransform, NormalizedLandmarkList landmarkList,
        NormalizedRect faceRect, List<Detection> faceDetections, bool isFlipped = false)
    {
      if (landmarkList == null) {
        Clear();
        return;
      }

      UpdateFaceMesh(landmarkList); // 追加

      /* ~ 省略 ~ */

    /* ------------------- 追加 ------------------- */
    private int meshScale = -5; // サイズ調整用の変数
    private void UpdateFaceMesh(NormalizedLandmarkList landmarkList) {
      // 顔の頂点分だけ実行（478 - 10 = 468）
      for (var i = 0; i < landmarkList.Landmark.Count - 10; i++)
      {
          var landmark = landmarkList.Landmark[i];
          // 検出したLandmarkをMeshの頂点座標にセット
          vertextList[i] = new Vector3(meshScale*landmark.X, meshScale*landmark.Y, meshScale*landmark.Z);
      }
      // 座標リストをMeshに適用
      faceMesh.SetVertices(vertextList);
    }
    /* ------------------------------------------- */

    private MeshFilter meshFilter;
    private Mesh faceMesh;
    private List<Vector3> vertextList = new List<Vector3>();

    /* ------------------- 追加 ------------------- */
    private MeshFilter leftEyeMeshFilter;
    private Mesh leftEyeMesh;
    private List<Vector3> leftEyeVertextList = new List<Vector3>();
    private List<Vector2> leftEyeUvList = new List<Vector2>();
    private List<int> leftEyeIndexList = new List<int>();

    private MeshFilter rightEyeMeshFilter;
    private Mesh rightEyeMesh;
    private List<Vector3> rightEyeVertextList = new List<Vector3>();
    private List<Vector2> rightEyeUvList = new List<Vector2>();
    private List<int> rightEyeIndexList = new List<int>();
    /* ------------------------------------------- */

    /* ~ 省略 ~ */

    void Awake() {
      /* ~ 省略 ~ */
      meshFilter = GameObject.Find("default").GetComponent<MeshFilter>();
      faceMesh = meshFilter.mesh;
      vertextList.AddRange(faceMesh.vertices);

      /* ------------------- 追加 ------------------- */     
      leftEyeMeshFilter = GameObject.Find("LeftEye").GetComponent<MeshFilter>();
      leftEyeMesh = CreateEyeMesh(leftEyeVertextList, leftEyeUvList, leftEyeIndexList, true);
      leftEyeMeshFilter.mesh = leftEyeMesh;

      rightEyeMeshFilter = GameObject.Find("RightEye").GetComponent<MeshFilter>();
      rightEyeMesh = CreateEyeMesh(rightEyeVertextList, rightEyeUvList, rightEyeIndexList, false);
      rightEyeMeshFilter.mesh = rightEyeMesh;
      /* ------------------------------------------- */

    /* ~ 省略 ~ */

    private void UpdateFaceMesh(NormalizedLandmarkList landmarkList) {
      for (var i = 0; i < landmarkList.Landmark.Count - 10; i++)
      {
          var landmark = landmarkList.Landmark[i];
          vertextList[i] = new Vector3(meshScale*landmark.X, meshScale*landmark.Y, meshScale*landmark.Z);
      }
      faceMesh.SetVertices(vertextList);

      /* ------------------- 追加 ------------------- */
      for (var i = landmarkList.Landmark.Count - 9; i < landmarkList.Landmark.Count - 5; i++)
      {
        var landmark = landmarkList.Landmark[i];

        leftEyeVertextList[i-469] = new Vector3(meshScale*landmark.X, meshScale*landmark.Y, meshScale*landmark.Z);
      }
      leftEyeMesh.SetVertices(leftEyeVertextList);

      for (var i = landmarkList.Landmark.Count - 4; i < landmarkList.Landmark.Count; i++)
      {
        var landmark = landmarkList.Landmark[i];

        rightEyeVertextList[i-474] = new Vector3(meshScale*landmark.X, meshScale*landmark.Y, meshScale*landmark.Z);
      }
      rightEyeMesh.SetVertices(rightEyeVertextList);
      /* ------------------------------------------- */
    }

    /* ------------------- 追加 ------------------- */
    private Mesh CreateEyeMesh(List<Vector3> eyeVertextList, List<Vector2> eyeUvList, List<int> eyeIndexList, bool isLeftEye)
    {
        var mesh = new Mesh();
        eyeVertextList.Add(new Vector3(1, 0, 0));
        eyeVertextList.Add(new Vector3(0, -1, 0));
        eyeVertextList.Add(new Vector3(-1, 0, 0));
        eyeVertextList.Add(new Vector3(0, 1, 0));

        eyeUvList.Add(new Vector2(1f, 0.5f));
        eyeUvList.Add(new Vector2(0.5f, 1f));
        eyeUvList.Add(new Vector2(0f, 0.5f));
        eyeUvList.Add(new Vector2(0.5f, 0f));

        if(isLeftEye){
          eyeIndexList.AddRange(new []{0,3,1,1,3,2});
        } else {
          eyeIndexList.AddRange(new []{2,3,1,1,3,0});
        }

        mesh.SetVertices(eyeVertextList);
        mesh.SetUVs(0,eyeUvList);
        mesh.SetIndices(eyeIndexList.ToArray(),MeshTopology.Triangles, 0);
        return mesh;
    }
    /* ------------------------------------------- */