Unity determines whether the object is in the camera field of view

private bool IsInView(Transform tran)
      {
          Transform camTransform = GameCamMgr.S.gameplayCamera.transform;
          Vector2 viewPos = GameCamMgr.S.gameplayCamera.WorldToViewportPoint(tran.position);
          Vector3 dir = (tran.position - camTransform.position).normalized;
          float dot = Vector3.Dot(camTransform.forward, dir);// Determine whether the object is in front of the camera 

          if (dot>0&&viewPos.x >= 0 && viewPos.x <= 1 && viewPos.y >= 0 && viewPos.y <= 1)
              return true;
          else 
          {
              //Log.e("x_{0}, y_{1}",viewPos.x,viewPos.y);
              return false;
          }
      }
      ```