Wes xx mediapipe integration

Packages/com.github.homuler.mediapipe/Runtime/Scripts/Graphs/InstantMotionTracking/Anchor3d.cs

@@ -0,0 +1,24 @@
+// Copyright (c) 2021 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+using System.Runtime.InteropServices;
+
+namespace Mediapipe
+{
+  [StructLayout(LayoutKind.Sequential)]
+  public struct Anchor3d
+  {
+    public float x;
+    public float y;
+    public float z;
+    public int stickerId;
+
+    public override string ToString()
+    {
+      return $"({x}, {y}, {z}), #{stickerId}";
+    }
+  }
+}