simplifying a mesh problem

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using Microsoft.DirectX;using Microsoft.DirectX.Direct3D;namespace Chapter7Code{	/// <summary>	/// Summary description for Form1.	/// </summary>	public class Form1 : System.Windows.Forms.Form	{        private Device device = null;        private Mesh mesh = null;        private Mesh simplifiedMesh = null;        private Material[] meshMaterials;        private Texture[] meshTextures;        private bool isSimplified = false;        private bool isClose = true;        /// <summary>		/// Required designer variable.		/// </summary>		private System.ComponentModel.Container components = null;        private float angle = 0.0f;		public Form1()		{			//			// Required for Windows Form Designer support			//			InitializeComponent();            this.Setstyle(Controlstyles.AllPaintingInWmPaint | Controlstyles.Opaque, true);		}        /// <summary>        /// We will initialize our graphics device here        /// </summary>        public void InitializeGraphics()        {            // Set our presentation parameters            PresentParameters presentParams = new PresentParameters();            presentParams.Windowed = true;            presentParams.SwapEffect = SwapEffect.Discard;            presentParams.AutoDepthStencilFormat = DepthFormat.D16;            presentParams.EnableAutoDepthStencil = true;            // Create our device            device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);            // Load our mesh            LoadMesh(@"..\..\tiny.x");        }        private void LoadMesh(string file)        {            ExtendedMaterial[] mtrl;            GraphicsStream adj;            // Load our mesh            mesh = Mesh.FromFile(file, MeshFlags.Managed, device, out adj, out mtrl);            // If we have any materials, store them            if ((mtrl != null) && (mtrl.Length > 0))            {                meshMaterials = new Material[mtrl.Length];                meshTextures = new Texture[mtrl.Length];                // Store each material and texture                for (int i = 0; i < mtrl.Length; i++)                {                    meshMaterials = mtrl.Material3D;                    if ((mtrl.TextureFilename != null) && (mtrl.TextureFilename != string.Empty))                    {                        // We have a texture, try to load it                        meshTextures = TextureLoader.FromFile(device, @"..\..\" + mtrl.TextureFilename);                    }                }            }            // Clean our main mesh            Mesh tempMesh = Mesh.Clean(mesh, adj, adj);            // Replace our existing mesh with this one            mesh.Dispose();            mesh = tempMesh;            // Get our new simplified mesh            simplifiedMesh = Mesh.Simplify(mesh, adj, null, 1, MeshFlags.SimplifyVertex);            // Save our simplified mesh for later use            // First we need to generate the adjacency for this mesh            int[] simpleAdj = new int[simplifiedMesh.NumberFaces * 3];            simplifiedMesh.GenerateAdjacency(0.0f, simpleAdj);            using (Mesh cleanedMesh = Mesh.Clean(simplifiedMesh,                         simpleAdj, out simpleAdj))            {                cleanedMesh.Save(@"..\..\simple.x", simpleAdj,                     mtrl, XFileFormat.Text);            }            Console.WriteLine("Number of vertices in original mesh: {0}", mesh.NumberVertices);            Console.WriteLine("Number of vertices in simplified mesh: {0}", simplifiedMesh.NumberVertices);        }        private void SetupCamera()        {            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 1.0f, 10000.0f);            if (isClose)            {                device.Transform.View = Matrix.LookAtLH(new Vector3(0,0, 580.0f), new Vector3(), new Vector3(0,1,0));            }            else            {                device.Transform.View = Matrix.LookAtLH(new Vector3(0,0, 8580.0f), new Vector3(), new Vector3(0,1,0));            }            //device.RenderState.FillMode = FillMode.WireFrame;            device.RenderState.Ambient = Color.DarkBlue;            device.Lights[0].Type = LightType.Directional;            device.Lights[0].Diffuse = Color.White;            device.Lights[0].Direction = new Vector3(0, -1, -1);            device.Lights[0].Commit();            device.Lights[0].Enabled = true;        }        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)        {            device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.CornflowerBlue, 1.0f, 0);            SetupCamera();            device.BeginScene();            // Draw our Mesh            DrawMesh(angle / (float)Math.PI, angle / (float)Math.PI * 2.0f, angle / (float)Math.PI / 4.0f, 0.0f, 0.0f, 0.0f);            device.EndScene();            device.Present();            this.Invalidate();        }        private void DrawMesh(float yaw, float pitch, float roll, float x, float y, float z)        {            angle += 0.11f;            device.Transform.World = Matrix.RotationYawPitchRoll(yaw, pitch, roll) * Matrix.Translation(x, y, z);            for (int i = 0; i < meshMaterials.Length; i++)            {                device.Material = meshMaterials;                device.SetTexture(0, meshTextures);                if (!isSimplified)                {                    mesh.DrawSubset(i);                }                else                {                    simplifiedMesh.DrawSubset(i);                }            }        }        protected override void OnKeyPress(KeyPressEventArgs e)        {            if (e.KeyChar == ' ')            {                isSimplified = !isSimplified;            }            if (e.KeyChar == 'm')            {                isClose = !isClose;            }        }        /// <summary>		/// Clean up any resources being used.		/// </summary>		protected override void Dispose( bool disposing )		{			if( disposing )			{				if (components != null) 				{					components.Dispose();				}			}			base.Dispose( disposing );		}		#region Windows Form Designer generated code		/// <summary>		/// Required method for Designer support - do not modify		/// the contents of this method with the code editor.		/// </summary>		private void InitializeComponent()		{			this.components = new System.ComponentModel.Container();			this.Size = new Size(800,600);			this.Text = "Form1";		}		#endregion		/// <summary>		/// The main entry point for the application.		/// </summary>        static void Main()         {            using (Form1 frm = new Form1())            {                // Show our form and initialize our graphics engine                frm.Show();                frm.InitializeGraphics();                Application.Run(frm);            }        }	}}