DiabloRendererScript.cs

public Camera FirstPersonCamera;
public GameObject DetectedPlanePrefab;
public GameObject DiabloGameObject;

void Update () {

      _UpdateApplicationLifecycle();

      // Hide snackbar when currently tracking at least one plane.
      Session.GetTrackables<DetectedPlane>(m_AllPlanes);
      bool showSearchingUI = true;
      for (int i = 0; i < m_AllPlanes.Count; i++)
      {
          if (m_AllPlanes[i].TrackingState == TrackingState.Tracking)
          {
              showSearchingUI = false;
              break;
          }
      }

      // If the player has not touched the screen, we are done with this update.
      Touch touch;
      if (Input.touchCount < 1 || (touch = Input.GetTouch(0)).phase != TouchPhase.Began)
      {
          return;
      }

      // Raycast against the location the player touched to search for planes.
      TrackableHit hit;
      TrackableHitFlags raycastFilter = TrackableHitFlags.PlaneWithinPolygon |
          TrackableHitFlags.FeaturePointWithSurfaceNormal;

      if (Frame.Raycast(touch.position.x, touch.position.y, raycastFilter, out hit))
      {
          // Use hit pose and camera pose to check if hittest is from the
          // back of the plane, if it is, no need to create the anchor.
          if ((hit.Trackable is DetectedPlane) &&
              Vector3.Dot(FirstPersonCamera.transform.position - hit.Pose.position,
                  hit.Pose.rotation * Vector3.up) < 0)
          {
              Debug.Log("Hit at back of the current DetectedPlane");
          }
          else
          {
              var diabloGameObj = Instantiate(DiabloGameObject, hit.Pose.position, hit.Pose.rotation);
              diabloGameObj.transform.Rotate(0, k_ModelRotation, 0, Space.Self);
              var anchor = hit.Trackable.CreateAnchor(hit.Pose);
              diabloGameObj.transform.parent = anchor.transform;
          }
      }
}