1 | #ifndef _Mesh_H__
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2 | #define _Mesh_H__
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3 |
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4 | #include <vector>
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5 | using namespace std;
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6 | #include "Intersectable.h"
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7 | #include "Plane3.h"
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8 | #include "Matrix4x4.h"
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9 | #include "AxisAlignedBox3.h"
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10 | #include "Material.h"
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11 | #include "Containers.h"
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12 |
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13 |
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14 | namespace GtpVisibilityPreprocessor {
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15 |
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16 | struct Triangle3;
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17 | class MeshInstance;
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18 | class MeshKdTree;
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19 |
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20 | /// default vertex container for Mesh
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21 | typedef std::vector<Vector3> VertexContainer;
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22 |
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23 | /// vertex index container
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24 | typedef std::vector<short> VertexIndexContainer;
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25 |
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26 |
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27 | /** Patch used as an element of the mesh */
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28 | struct Face {
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29 |
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30 | public:
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31 | Face(): mVertexIndices() {}
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32 |
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33 | Face(const int a, const int b, const int c):mVertexIndices(3) {
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34 | mVertexIndices[0] = a;
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35 | mVertexIndices[1] = b;
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36 | mVertexIndices[2] = c;
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37 | }
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38 |
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39 | Face(const int a, const int b, const int c, const int d):
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40 | mVertexIndices(4) {
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41 | mVertexIndices[0] = a;
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42 | mVertexIndices[1] = b;
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43 | mVertexIndices[2] = c;
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44 | mVertexIndices[3] = d;
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45 | }
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46 |
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47 | Face(const VertexIndexContainer &vertices):mVertexIndices(vertices.size()) {
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48 | for (int i=0; i < vertices.size(); i++)
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49 | mVertexIndices[i] = vertices[i];
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50 | }
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51 |
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52 | /// list of vertex pointers
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53 | VertexIndexContainer mVertexIndices;
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54 | };
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55 |
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56 |
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57 |
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58 | /// default vertex container for Mesh
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59 | typedef vector<Vector3> VertexContainer;
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60 |
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61 | /// vertex index container
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62 | typedef vector<short> VertexIndexContainer;
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63 |
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64 | /// default patch container for Mesh
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65 | typedef std::vector<Face *> FaceContainer;
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66 |
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67 | /** Mesh containing polygonal patches */
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68 | class Mesh {
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69 |
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70 | public:
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71 |
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72 | /// Default constructor
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73 | Mesh():mVertices(), mFaces(), mMaterial(NULL), mKdTree(NULL) {}
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74 |
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75 | /// Constructor with container preallocation
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76 | Mesh(const int vertices,
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77 | const int faces):
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78 | mFaces(),
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79 | mMaterial(NULL),
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80 | mKdTree(NULL),
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81 | mVertices(),
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82 | mIsConvex(false),
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83 | mIsWatertight(false)
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84 | {
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85 | mVertices.reserve(vertices);
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86 | mFaces.reserve(faces);
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87 | }
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88 |
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89 | ~Mesh() {
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90 | for (int i=0; i < mFaces.size(); i++)
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91 | delete mFaces[i];
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92 | }
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93 |
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94 |
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95 | void Clear() {
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96 | mVertices.clear();
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97 | mFaces.clear();
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98 | }
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99 |
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100 | void IndexVertices();
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101 |
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102 | void AssignRandomMaterial();
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103 | void AddTriangle(const Triangle3 &triangle);
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104 | void AddRectangle(const Rectangle3 &triangle);
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105 |
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106 | void Cleanup();
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107 |
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108 | bool ValidateFace(const int face);
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109 |
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110 | void AddFace(Face *face)
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111 | {
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112 | mFaces.push_back(face);
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113 | }
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114 |
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115 | void ComputeBoundingBox();
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116 | void Preprocess();
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117 |
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118 | /** Axis aligned bounding box of the mesh in local mesh coordinates */
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119 | AxisAlignedBox3 mBox;
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120 |
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121 | /** Vertices forming the mesh */
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122 | VertexContainer mVertices;
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123 |
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124 | /** Patches forming the mesh */
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125 | FaceContainer mFaces;
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126 |
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127 | /** Global mesh material */
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128 | Material *mMaterial;
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129 |
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130 | /** true if the mesh is a convex mesh */
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131 | bool mIsConvex;
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132 |
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133 | /** true if the mesh is a convex mesh */
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134 | bool mIsWatertight;
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135 |
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136 | MeshKdTree *mKdTree;
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137 |
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138 | int
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139 | CastRay(
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140 | Ray &ray,
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141 | MeshInstance *instance
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142 | );
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143 |
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144 | int
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145 | CastRayToSelectedFaces(
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146 | Ray &ray,
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147 | const vector<int> &faces,
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148 | Intersectable *instance
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149 | );
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150 |
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151 | int
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152 | CastRayToFace(
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153 | const int faceIndex,
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154 | Ray &ray,
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155 | float &nearestT,
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156 | int &nearestFace,
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157 | Intersectable *instance
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158 | );
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159 |
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160 |
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161 | int
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162 | RayFaceIntersection(const int faceIndex,
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163 | const Ray &ray,
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164 | float &t,
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165 | const float nearestT
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166 | );
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167 |
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168 | Plane3 GetFacePlane(const int faceIndex);
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169 |
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170 | AxisAlignedBox3 GetFaceBox(const int faceIndex);
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171 |
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172 | int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal);
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173 |
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174 | int
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175 | GetRandomVisibleSurfacePoint(Vector3 &point,
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176 | Vector3 &normal,
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177 | const Vector3 &viewpoint,
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178 | const int maxTries
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179 | );
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180 |
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181 | virtual ostream &Describe(ostream &s) {
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182 | return s<<"Mesh #vertices="<<(int)mVertices.size()<<" #faces="<<(int)mFaces.size();
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183 | }
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184 |
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185 | friend Mesh *CreateBox(const AxisAlignedBox3 &box);
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186 | };
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187 |
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188 |
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189 | class MeshInstance : public Intersectable {
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190 | protected:
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191 | Mesh *mMesh;
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192 |
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193 | public:
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194 | MeshInstance(Mesh *mesh):Intersectable(), mMesh(mesh)
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195 | {
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196 | }
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197 |
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198 | int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal);
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199 |
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200 | int
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201 | GetRandomVisibleSurfacePoint(Vector3 &point,
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202 | Vector3 &normal,
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203 | const Vector3 &viewpoint,
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204 | const int maxTries
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205 | );
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206 |
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207 |
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208 | Mesh *GetMesh() { return mMesh; }
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209 |
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210 | virtual AxisAlignedBox3 GetBox() {
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211 | return mMesh->mBox;
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212 | }
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213 |
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214 | virtual int
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215 | CastRay(
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216 | Ray &ray
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217 | );
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218 |
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219 | virtual bool IsConvex() { return mMesh->mIsConvex; }
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220 | virtual bool IsWatertight() { return mMesh->mIsWatertight; }
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221 | virtual float IntersectionComplexity() { return (float)mMesh->mFaces.size(); }
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222 |
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223 | virtual int NumberOfFaces() const { return (int)mMesh->mFaces.size(); }
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224 |
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225 | virtual int Type() const { return MESH_INSTANCE; }
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226 |
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227 | virtual int
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228 | CastRay(
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229 | Ray &ray,
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230 | const vector<int> &faces
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231 | );
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232 |
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233 |
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234 | virtual ostream &Describe(ostream &s) {
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235 | s<<"MeshInstance Id="<<GetId();
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236 | return mMesh->Describe(s);
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237 | }
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238 |
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239 | };
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240 |
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241 |
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242 | class TransformedMeshInstance : public MeshInstance
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243 | {
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244 | public:
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245 | TransformedMeshInstance(Mesh *mesh):MeshInstance(mesh)
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246 | {
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247 | mWorldTransform = IdentityMatrix();
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248 | }
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249 |
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250 | virtual AxisAlignedBox3 GetBox() {
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251 | return Transform(mMesh->mBox,
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252 | mWorldTransform);
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253 | }
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254 |
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255 | virtual int
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256 | CastRay(
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257 | Ray &ray
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258 | );
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259 |
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260 | virtual int Type() const { return TRANSFORMED_MESH_INSTANCE; }
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261 |
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262 | int GetRandomSurfacePoint(Vector3 &point, Vector3 &normal);
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263 |
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264 | private:
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265 | Matrix4x4 mWorldTransform;
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266 |
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267 | };
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268 |
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269 | }
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270 |
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271 | #endif
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