DirectX模型拾取(C#附源码).doc

前段时间弄d3d，看完红书和基于Visual+C#的DirectX开发实例，就自己练习了下这个程序sdk上面都有拾取，但是没有选中移动，最近的项目要用到，就简单仿了下3dmax的移动方式选中物体，再选取需要移动的平面，效果如下： 拾取代码中会有个小问题，就是会出现重复多选的问题，本例中是通过比较Intersect函数返回参数IntersectInformation中交点距离的最短值找出mesh的；大家可以用list的遍历找最小值，方法很多然后是关于平面的移动，当选取完成之后。会出现三个完全透明的平面，物体就是根据隐形平面的u v值进行移动的；重要代码如下：（我基本打成class类，后期工程的时候会加到dll中，这个只是演示，便于学习）这个是：class类c-sharpview plaincopyprint?1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Drawing; 6 using Microsoft.DirectX; 7 using Microsoft.DirectX.Direct3D; 8 9 namespace PickObject 10 11 public class Hawk_Class 12 13 public Device device; /Device 14 public float Pan_Width, Pan_High; /pannel Size 15 16 /初始化类 17 public Hawk_Class(Device device,float w,float h) 18 19 this.device = device; 20 Pan_Width = w; 21 Pan_High = h; 22 23 24 /寻找交点 25 public void Check_Point_Face(float Mouse_x, float Mouse_y, Vector3 Cam_Postion, 26 Mesh Chech_Mesh, Matrix Chech_Mesh_Postion, out bool Check_Bool, out IntersectInformation Point_Inf) 27 28 /计算摄像机投影窗口上对应的点击位置坐标 29 Vector3 SVector = new Vector3(); 30 SVector.X = 2 * Mouse_x / this.Pan_Width - 1; 31 SVector.Y = -2 * Mouse_y / this.Pan_High + 1; 32 SVector.Z = 1.0f / (float)Math.Tan(Math.PI / 8); 33 /视图矩阵 34 Matrix viewMatrix = this.device.Transform.View; 35 viewMatrix.Invert();/计算视图矩阵的逆矩阵 36 /射线位置 37 Vector3 rayPos = Vector3.TransformCoordinate(SVector, viewMatrix); 38 /射线方向 39 Vector3 rayDir = Vector3.Subtract(rayPos, Cam_Postion); 40 /碰撞检测 41 /将模型的世界矩阵进行逆变换 42 Matrix inverseWorld = Matrix.Invert(Chech_Mesh_Postion); 43 Vector3 localRayPos = Vector3.TransformCoordinate(rayPos, inverseWorld); 44 Vector3 localRayDir = Vector3.TransformNormal(rayDir, inverseWorld); 45 IntersectInformation PI; 46 bool result = Chech_Mesh.Intersect(localRayPos, localRayDir, out PI); 47 Check_Bool = result; 48 Point_Inf = PI; 49 50 51 /创建一个mesh类 52 public void Create_Mesh(Vector3 pointVectors,out Mesh M_H) 53 54 Mesh meshObject; 55 /定义顶点 56 CustomVertex.PositionColored arrayVertices = new CustomVertex.PositionColored4; 57 /定义索引 58 Int16 arrayIndices = new Int166; 59 /定义属性 60 AttributeRange attributeRange = new AttributeRange(); 61 /实例化网格对象 62 meshObject = new Mesh(arrayIndices.Length / 3, arrayVertices.Length, MeshFlags.SystemMemory, CustomVertex.PositionColored.Format, device); 63 /设置顶点坐标值 64 arrayVertices0.Position = pointVectors0; 65 arrayVertices0.Color = Color.FromArgb(108, 255, 255, 255).ToArgb(); 66 arrayVertices1.Position = pointVectors1; 67 arrayVertices1.Color = Color.FromArgb(108, 255, 255, 255).ToArgb(); 68 arrayVertices2.Position = pointVectors2; 69 arrayVertices2.Color = Color.FromArgb(108, 255, 255, 255).ToArgb(); 70 arrayVertices3.Position = pointVectors3; 71 arrayVertices3.Color = Color.FromArgb(108, 255, 255, 255).ToArgb(); 72 /设置索引,顶部三角形 73 arrayIndices0 = 0; arrayIndices1 = 1; arrayIndices2 = 3; 74 arrayIndices3 = 3; arrayIndices4 = 1; arrayIndices5 = 2; 75 /设置属性 76 attributeRange.AttributeId = 0; 77 attributeRange.FaceStart = 0; 78 attributeRange.FaceCount = arrayIndices.Length / 3; 79 attributeRange.VertexStart = 0; 80 attributeRange.VertexCount = arrayVertices.Length; 81 /设置网格对象的索引缓冲和顶点缓冲数据 82 meshObject.VertexBuffer.SetData(arrayVertices, 0, LockFlags.None); 83 meshObject.IndexBuffer.SetData(arrayIndices, 0, LockFlags.None); 84 meshObject.SetAttributeTable(new AttributeRange attributeRange ); 85 M_H = meshObject; 86 87 public void Create_Mesh_Face(Vector3 pointVectors, out Mesh M_H) 88 89 Mesh meshObject; 90 /定义顶点 91 CustomVertex.PositionColored arrayVertices = new CustomVertex.PositionColored3; 92 /定义索引 93 Int16 arrayIndices = new Int163; 94 /定义属性 95 AttributeRange attributeRange = new AttributeRange(); 96 /实例化网格对象 97 meshObject = new Mesh(arrayIndices.Length / 3, arrayVertices.Length, MeshFlags.SystemMemory, CustomVertex.PositionColored.Format, device); 98 /设置顶点坐标值 99 arrayVertices0.Position = pointVectors0; 100 arrayVertices0.Color = Color.FromArgb(0, 255, 255, 255).ToArgb(); 101 arrayVertices1.Position = pointVectors1; 102 arrayVertices1.Color = Color.FromArgb(0, 255, 255, 255).ToArgb(); 103 arrayVertices2.Position = pointVectors2; 104 arrayVertices2.Color = Color.FromArgb(0, 255, 255, 255).ToArgb(); 105 /设置索引,顶部三角形 106 arrayIndices0 = 0; arrayIndices1 = 1; arrayIndices2 = 2; 107 /设置属性 108 attributeRange.AttributeId = 0; 109 attributeRange.FaceStart = 0; 110 attributeRange.FaceCount = arrayIndices.Length / 3; 111 attributeRange.VertexStart = 0; 112 attributeRange.VertexCount = arrayVertices.Length; 113 /设置网格对象的索引缓冲和顶点缓冲数据 114 meshObject.VertexBuffer.SetData(arrayVertices, 0, LockFlags.None); 115 meshObject.IndexBuffer.SetData(arrayIndices, 0, LockFlags.None); 116 meshObject.SetAttributeTable(new AttributeRange attributeRange ); 117 M_H = meshObject; 118 119 120 /所有关于坐标的初始化 121 public void SetLine_and_Face(Mesh meshObjXYZ, Mesh checkface, out Material meshMaterialsXYZ, 122 VertexBuffer _xyzLineVertexBuffer) 123 124 /三个标示的大平面 125 Vector3 points = new Vector34; 126 points0 = new Vector3(0f, 0f, 0f); 127 points1 = new Vector3(0f, 5f, 0f); 128 points2 = new Vector3(5f, 5f, 0f); 129 points3 = new Vector3(5f, 0f, 0f); 130 Create_Mesh(points, out meshObjXYZ0); 131 132 Vector3 points1 = new Vector34; 133 points10 = new Vector3(0f, 0f, 0f); 134 points11 = new Vector3(0f, 5f, 0f); 135 points12 = new Vector3(0f, 5f, 5f); 136 points13 = new Vector3(0f, 0f, 5f); 137 Create_Mesh(points1, out meshObjXYZ1); 138 139 Vector3 points2 = new Vector34; 140 points20 = new Vector3(0f, 0f, 0f); 141 points21 = new Vector3(0f, 0f, 5f); 142 points22 = new Vector3(5f, 0f, 5f); 143 points23 = new Vector3(5f, 0f, 0f); 144 Create_Mesh(points2, out meshObjXYZ2); 145 146 /三个标示的大平面其材质 147 Material temp = new Material(); 148 temp.Diffuse = Color.FromArgb(108, 255, 255, 255); 149 temp.Ambient = Color.White; 150 temp.Specular = Color.White;/浅灰色 151 temp.SpecularSharpness = 1.0F; 152 meshMaterialsXYZ = temp; 153 154 /用于移动的三个大的透明平面 155 Vector3 points3 = new Vector33; 156 points30 = new Vector3(-500f, -500f, 0f); 157 points31 = new Vector3(-500f, 2000f, 0f); 158 points32 = new Vector3(2000f, -500f, 0f); 159 Create_Mesh_Face(points3, out checkface0); 160 161 Vector3 points4 = new Vector33; 162 points40 = new Vector3(0f, -500f, -500f); 163 points41 = new Vector3(0f, 2000f, -500f); 164 points42 = new Vector3(0f, -500f, 2000f); 165 Create_Mesh_Face(points4, out checkface1); 166 167 Vector3 points5 = new Vector33; 168 points50 = new Vector3(-500f, 0f, -500f); 169 points51 = new Vector3(-500f, 0f, 2000f); 170 points52 = new Vector3(2000f, 0f, -500f); 171 Create_Mesh_Face(points5, out checkface2); 172 173 /三根XYZ坐标的数据生成 174 using (GraphicsStream data = _xyzLineVertexBuffer.Lock(0, 0, LockFlags.None) 175 176 data.Write(new CustomVertex.PositionColored(0.0f, 0.0f, 0.0f, Color.Red.ToArgb(); 177 data.Write(new CustomVertex.PositionColored(10.0f, 0.0f, 0.0f, Color.Red.ToArgb(); 178 data.Write(new CustomVertex.PositionColored(0.0f, 0.0f, 0.0f, Color.Green.ToArgb(); 179 data.Write(new CustomVertex.PositionColored(0.0f, 10.0f, 0.0f, Color.Green.ToArgb(); 180 data.Write(new CustomVertex.PositionColored(0.0f, 0.0f, 0.0f, Color.White.ToArgb(); 181 data.Write(new CustomVertex.PositionColored(0.0f, 0.0f, 10.0f, Color.White.ToArgb(); 182 _xyzLineVertexBuffer.Unlock(); 183 184 185 186 /给予一个mesh数组以及对应mesh位置的数组，确认鼠标选中的最近的mesh 187 /(最后一个参数:选择哪个model，:选择哪个平面) 188 public int Select_Mesh_Fun(float Mouse_x, float Mouse_y,Vector3 Cam_Postion, 189 Mesh Check_Mesh, Matrix Chech_Mesh_Postion,int flag) 190 191 int Lenth_Data = Check_Mesh.Length; 192 int selected; 193 IntersectInformation Pi = new IntersectInformation3; 194 for (int i = 0; i Lenth_Data; i+) 195 196 bool result; 197 if(flag=99) 198 Check_Point_Face(Mouse_x, Mouse_y, Cam_Postion, Check_Meshi, Chech_Mesh_Postioni, out result, out Pii); 199 else 200 Check_Point_Face(Mouse_x, Mouse_y, Cam_Postion, Check_Meshi, Chech_Mesh_Postionflag, out result, out Pii); 201 if (!result) 202 Pii.Dist = 9999.0f; 203 204 205 #region /找出最短的mesh 206 float tempmin = Math.Min(Pi0.Dist, Pi1.Dist); 207 if (tempmin = Pi0.Dist); 208 else 209 selected = 1; 210 211 tempmin = Math.Min(tempmin, Pi2.Dist); 212 if (tempmin = Pi2.Dist) 213 selected = 2; 214 215 if (tempmin = 9999.0f) 216 selected = 99; 217 218 #endregion 219 return selected; 220 221 222 223 这个是对应loop吐出画面的函数：c-sharpview plaincopyprint?224 device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.DarkSlateBlue, 1.0f, 0); /清除windows界面为深蓝色 225 device.BeginScene(); 226 227 device.RenderState.CullMode = Cull.None;/显示里面的机构 228 229 device.Lights0.Type = LightType.Directional; 230 device.Lights0.Diffuse = System.Drawing.Color.Red; 231 device.Lights0.Direction = new Vector3(-1.0f, 1.0f, 1.0f); 232 device.Lights0.Enabled = true; /打开灯光 233 device.Lights1.Type = LightType.Directional; 234 device.Lights1.Diffuse = System.Drawing.Color.Green; 235 device.Lights1.Direction = new Vector3(1f, -1.0f, 1.0f); 236 device.Lights1.Enabled = true; /打开灯光 237 device.RenderState.Ambient = Color.SlateGray; 238 239 device.SetRenderState(RenderStates.AlphaBlendEnable, true);/开启透明度 240 device.RenderState.SourceBlend = Blend.SourceAlpha; 241 device.RenderState.DestinationBlend = Blend.InvSourceAlpha; 242 243 /以实体形式绘制茶壶模型 244 device.RenderState.FillMode = FillMode.Solid; 245 246 for (int i = 0; i meshObj.Length; i+) 247 248 device.Transform.World = meshPositioni; 249 if (i = selected) 250 251 device.RenderState.Lighting = false; 252 / XYZ 253 this.device.SetStreamSource(0, this._xyzLineVertexBuffer, 0); 254 this.device.VertexFormat = CustomVertex.PositionColored.Format; 255 this.device.DrawPrimitives(PrimitiveType.LineList, 0, 3); 256 257 device.RenderState.Lighting = true; 258 for (int j = 0; j 3; j+)/选中模型的选中平面显示 259 260 if (j = selectedFace) 261 device.Material = meshMaterialsXYZ; 262 else 263 device.Material = new Material(); 264 265 meshObjXYZj.D