public Camera(Game game)
 {
     topDownPos = new Vector3(0, 80, -1);
     Instance = this;
     _nearClip = 1.0f;
     _farClip = 2000.0f;
     _viewAngle = MathHelper.Pi / 3;
     _cameraPosition = topDownPos;
     _aspectRatio = (float)game.GraphicsDevice.Viewport.Width / game.GraphicsDevice.Viewport.Height;
 }
 //Load graphics content
 protected override void LoadContent()
 {
     string asset;
     for (int i = 0; i < preloadAssets.Length; i++)
     {
         asset = preloadAssets[i];
         Content.Load<object>(asset);
     }
     camera = new Camera(this);
 }