Time for action – implementing a look-at point

1. 1. Add the following properties to the Fields region of the Camera class:

   private Vector3 lookAt;
   private Vector3 baseCameraReference = new Vector3(0, 0, 1);
   private bool needViewResync = true;

2. 2. Add the following region and method to the Camera class:

   #region Helper Methods
   private void UpdateLookAt()
   {
       Matrix rotationMatrix = Matrix.CreateRotationY(rotation);
       Vector3 lookAtOffset = Vector3.Transform(
           baseCameraReference, 
           rotationMatrix);
       lookAt = position + lookAtOffset;
       needViewResync = true;
   }
   #endregion

3. 3. Define the MoveTo() method that is called in the constructor. This method should be placed inside the Helper Methods region you just created:

   public void MoveTo(Vector3 position, float rotation)
   {
       this.position = position;
       this.rotation = rotation;
       UpdateLookAt();
   }

4. 4. Add two new public properties to the Properties region of the Camera class:

   public Vector3 Position 
   {
       get
       {
           return...