Time for action – moving the world

To move both the track and the skybox in relation to the camera, perform the following steps:

1. 1. In the Skybox class, add a new property to allow us to set the rotation while maintaining a valid angle as follows:

   #region Properties
   public float Rotation
   {
       get { return rotation; }
       set { rotation = MathHelper.WrapAngle(value); }
   }
   #endregion

2. 2. Inside the if statement in the Update() method of the MarsRunnerPlayScreen class, just before the rover is updated, update the variable that controls the track position and rotate the skybox as follows:

   if (playerPosition < 2880)
   {
       playerPosition += 15 * elapsed;
       skybox.Rotation += 0.1f * elapsed;
   }

3. 3. Execute the game.

What just happened?

The way the track is drawn is based on the playerPosition variable. Hence, updating this value causes the track to scroll slowly past the camera. Similarly, slowly rotating the skybox to match the speed that the track is moving gives the illusion that the player is...