Time for action – the GameEntity class

To add a class for implementing the common functionality in Mars Runner, perform the following steps:

1. 1. Add a new class file called GameEntity.cs to the Mars Runner project.

2. 2. Add the following using directives at the beginning of the GameEntity class file:

   using Microsoft.Xna.Framework;
   using Microsoft.Xna.Framework.Graphics;

3. 3. Add fields to the GameEntity class as follows:

   #region Fields
   protected Model model;
   protected GraphicsDevice device;
   protected Vector3 position = Vector3.Zero;
   protected float scale = 1.0f;
   protected float yaw = 0f;
   protected float pitch = 0f;
   protected float roll = 0f;
   protected Dictionary<string, Matrix> baseTransforms = 
       new Dictionary<string, Matrix>();
   protected Dictionary<string, Matrix> currentTransforms = 
       new Dictionary<string, Matrix>();
   protected Matrix[] boneTransforms;
   protected Vector3 minVector;
   protected Vector3 maxVector;
   protected Vector3 drawOffset = Vector3.Zero;
   #endregion...