private Sky intitializeSky()
        {
            TextureCube tc = Content.Load<TextureCube>("clouds");
            Model pmodel = Content.Load<Model>("skysphere_mesh");
            SkyUnit skyUnit = new SkyUnit(this, Vector3.Zero, Vector3.Zero, new Vector3(10000));
            Sky sky = new Sky(this, pmodel, skyUnit, tc);

            return sky;
        }
        private void initializeGame1()
        {
            switch (StartScreen.Difficulty)
            {
                case Constants.Difficulties.Novice: difficultyConstants = new NoviceConstants(); break ;
                case Constants.Difficulties.Advanced: difficultyConstants = new AdvancedConstants(); break;
                case Constants.Difficulties.Xtreme: difficultyConstants = new XtremeConstants(); break;

            }
            //camera = new FreeCamera(this, new Vector3(0, 0, 0), 0, 0, 0 , 0);
            //camera = new FreeCamera(new Vector3(400, 600, 400), MathHelper.ToRadians(45), MathHelper.ToRadians(-30), GraphicsDevice);
            camera = new ChaseCamera(this, Constants.CAMERA_POSITION, Constants.CAMERA_TARGET, Vector3.Zero);
            terrain = new Terrain(this, camera, Content.Load<Texture2D>("terrain"), Constants.TERRAIN_CELL_SIZE,
                Constants.TERRAIN_HEIGHT, Content.Load<Texture2D>("grass"), Constants.TERRAIN_TEXTURE_TILING, new Vector3(1, -1, 0));

            player = initializePlayer();
            sky = intitializeSky();

            weapon = new Weapon(this, player, Content.Load<Model>("model//WeaponMachineGun"),
                new Unit(this, Vector3.Zero, Vector3.Zero, Vector3.One));
            bullets = new BulletsManager(this);
            scoreBoard = new ScoreBoard(this);
            monsters = new MonstersManager(this);
               firstAidManger = new FirstAidManager(this);

            stateManager = new StateManager(this);
            audioManager = new AudioManager(this);

            //CDrawableComponent test = new CDrawableComponent(this,
            //    new Unit(this, new Vector3(0, 80, 0), Vector3.Zero, Vector3.One * .5f),
            //    new CModel(this, Content.Load<Model>(@"model/First Aid Kit2")));
        }