public GamePage(string launchArguments)
        {
            this.InitializeComponent();

            // Create the game.
            _game = XamlGame <EnvironmentMapGame> .Create(launchArguments, Window.Current.CoreWindow, this);
        }
        //-------------------------------------------------------------------------------------
        // Class constructors

        public CubeObject(EnvironmentMapGame game, Vector3 position, Texture2D texture, float envMapAmount, float fresnelFactor)
            : base(game)
        {
            // Have we already built the cube vertex array in a previous instance?
            if (_vertices == null)
            {
                // No, so build them now
                BuildVertices();
                // Create a vertex buffer
                _vertexBuffer = new VertexBuffer(game.GraphicsDevice, typeof(VertexPositionNormalTexture), _vertices.Length, BufferUsage.WriteOnly);
                _vertexBuffer.SetData(_vertices);
            }

            // Set object properties
            Position             = position;
            ObjectTexture        = texture;
            EnvironmentMapAmount = envMapAmount;
            FresnelFactor        = FresnelFactor;
        }