public MainWindow()
        {
            InitializeComponent();

            //当前窗口创建graphics
            canvas = this.CreateGraphics();

            //当前窗口的宽高值
            buffer = new Bitmap(this.Width, this.Height);
            RenderUtility.SetFrameBuffer(buffer);

            //根据buffer的大小设定zbuffer
            zbuffer = new float[this.Width, this.Height];
            RenderUtility.SetZBuffer(zbuffer);

            //创建平行光,平行光的位置默认为(0, 20, 0),光照颜色为橘黄色,环境光颜色为白色
            light = new Light(new Vector3(0, 20, 0, 1), new Color4(Color.Orange), new Color4(Color.White));
            RenderUtility.SetLight(light);

            //创建摄像机, 摄像机位置默认为(0,0,0),朝向z轴方向(0,0,1),以(0,1,0)为单位up向量,y方向的视角为90度,zn = 1, zf = 500
            float aspect = (float)this.Width / (float)this.Height;

            camera = new Camera(new Vector3(0, 0, 0, 1), new Vector3(0, 0, 1, 0), new Vector3(0, 1, 0, 0),
                                3.1415926f / 4, aspect,
                                1.0f, 500.0f);

            //设定渲染的模式
            renderType = RenderType.WireFrame;
            renderType = RenderType.VertexColor;
            RenderUtility.SetRenderType(renderType);

            //加载模型
            //meshs,要渲染的网格列表
            meshs = new List <Mesh>();

            Mesh cube = new Mesh(Cube.positions, Cube.indices, Cube.colors);

            meshs.Add(cube);

            //开启计时器
            SetupTimer();
        }