[3D]1.绘制三角形

　　作为一个.Net程序员学习3D开发好尴尬啊，因为不论是OpenGL还是Direct3D都是用C/C++开发的比较多。虽然有计划使用C++进行开发，但是平时还是C#使用的多。很少用C++做东西，如果仅仅是学习是很难有进步的，学习C++很长时间了至今仍感觉很肤浅，而且语言并不是编程的全部，真正的高手是不区分语言的，所以决定注重基本原理的学习，具体实现用C#也是可以的，这里选择Slimdx。

环境：

VS2010+C#

SlimDX SDK (January 2012).msi

d3d9.dll, D3DX9_43.dll

 using System;
 using System.Drawing;
 using System.Windows.Forms;
 using SlimDX.Direct3D9;
 using SlimDX;
 using System.Runtime.InteropServices;

 namespace D3Ddemo01
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }
         Device device = null;
         private void Form1_Load(object sender, EventArgs e)
         {
             this.ClientSize = new System.Drawing.Size(, );
             this.Text = " 第1个D3D程序";

         }
         public bool InitializeDirect3D()
         {
             try
             {
                 Direct3D direct3d = new Direct3D();
                 //direct3d.GetAdapterDisplayMode(1);
                 PresentParameters presentParams = new PresentParameters();
                 presentParams.Windowed = true; //指定以Windows窗体形式显示
                 presentParams.SwapEffect = SwapEffect.Discard; //当前屏幕绘制后它将自动从内存中删除
                 device = new Device(direct3d, , DeviceType.Hardware, this.Handle,
                 CreateFlags.SoftwareVertexProcessing, presentParams); //实例化device对象
                 return true;
             }
             catch (Exception e)
             {
                 MessageBox.Show(e.ToString(), "Error"); //处理异常
                 return false;
             }
         }
         public void Render()
         {
             if (device == null)   //如果device为空则不渲染
             {
                 return;
             }
             Vector3 eye = new Vector3(,, -);
             Vector3 at = new Vector3(, , );
             Vector3 up = new Vector3(, , );
             Matrix viewMatrix = Matrix.LookAtLH(eye, at, up);

             Matrix projection = Matrix.PerspectiveFovLH((float)Math.PI / ,
 this.Width / this.Height, 1.0f, 50.0f);
             device.SetTransform(TransformState.Projection, projection);
             device.SetTransform(TransformState.View, viewMatrix);
             device.SetRenderState(RenderState.FillMode, FillMode.Solid);
             device.SetRenderState(RenderState.Lighting, false);
             //深度偏移
             //device.SetRenderState(RenderState.DepthBias, drawArgs.CurrentWorld.CurrentDepthBias - 0.00001f);//防止闪烁
             device.SetRenderState(RenderState.ZEnable, true);
             device.SetRenderState(RenderState.CullMode, Cull.None);

             //在此添加渲染图形代码
             VertexBuffer Vertices = new VertexBuffer(device,  * , Usage.WriteOnly, VertexFormat.None, Pool.Managed);
             DataStream stream = Vertices.Lock(, , LockFlags.None);
             Vertex[] vertexData = new Vertex[];
             vertexData[].PositionRhw = new Vector4(0.0f, 1.0f, 10.0f, 1.0f);
             vertexData[].Color = Color.Red.ToArgb();
             vertexData[].PositionRhw = new Vector4(1.0f, 0.0f, 10.0f, 1.0f);
             vertexData[].Color = Color.Blue.ToArgb();
             vertexData[].PositionRhw = new Vector4(2.0f, 2.0f, 10.0f, 1.0f);
             vertexData[].Color = Color.Green.ToArgb();
             stream.WriteRange(vertexData);
             Vertices.Unlock();
             //PositionColored[] vertices = new PositionColored[3];//定义顶点
             //vertices[0].Position = new Vector3(0f, 0f, 0f);
             //vertices[0].Color = Color.Red.ToArgb();
             //vertices[1].Position = new Vector3(5f, 10f, 0f);
             //vertices[1].Color = Color.Green.ToArgb();
             //vertices[2].Position = new Vector3(10f, 0f, 0f);
             //vertices[2].Color = Color.Yellow.ToArgb();
             //device.VertexFormat = VertexFormat.Position;
             //device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, Vertices);
             //device.RenderState.CullMode = Cull.None;
             // device.Clear(ClearFlags.Target, Color.DarkSlateBlue, 1.0f, 0);  //清除windows界面为深蓝色
             device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.Black, 1.0f, );
             device.BeginScene();
             device.SetStreamSource(, Vertices, , );
             device.VertexFormat = VertexFormat.Position | VertexFormat.Diffuse;
             device.DrawPrimitives(PrimitiveType.TriangleList, , );
             device.EndScene();
             device.Present();
         }
     }
     [StructLayout(LayoutKind.Sequential)]
     struct Vertex
     {
         public Vector4 PositionRhw;
         public int Color;
     }
 }

Form1

调用代码：

  static class Program
     {
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
         [STAThread]
         static void Main()
         {
             Form1 basicForm = new Form1(); //创建窗体对象
             if (basicForm.InitializeDirect3D() == false) //检查Direct3D是否启动
             {
                 MessageBox.Show("无法启动Direct3D！", "错误！");
                 return;
             }
             basicForm.Show(); //如果一切都初始化成功，则显示窗体
             while (basicForm.Created) //设置一个循环用于实时更新渲染状态
             {
                 basicForm.Render(); //保持device渲染，直到程序结束
                 Application.DoEvents(); //处理键盘鼠标等输入事件
             }
         }
     }

结果：