1 | #ifndef _VspBspTree_H__
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2 | #define _VspBspTree_H__
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3 |
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4 | #include "Mesh.h"
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5 | #include "Containers.h"
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6 | #include "Polygon3.h"
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7 | #include <stack>
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8 | #include "Statistics.h"
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9 | #include "VssRay.h"
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10 | #include "RayInfo.h"
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11 | #include "ViewCellBsp.h"
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12 |
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13 | class ViewCell;
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14 | //class BspViewCell;
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15 | class Plane3;
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16 | class VspBspTree;
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17 | class BspInterior;
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18 | class BspNode;
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19 | class AxisAlignedBox3;
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20 | class Ray;
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21 | class ViewCellsStatistics;
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22 |
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23 | /*class BspNodeGeometry;
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24 | class BspTreeStatistics;
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25 | class ViewCellsStatistics;
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26 | class BspNode;
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27 | class BspLeaf;
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28 | class BspInterior;
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29 | */
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30 |
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31 | /**
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32 | This is a view space partitioning specialised BSPtree.
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33 | There are no polygon splits, but we split the sample rays.
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34 | The candidates for the next split plane are evaluated only
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35 | by checking the sampled visibility information.
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36 | The polygons are employed merely as candidates for the next split planes.
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37 | */
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38 | class VspBspTree
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39 | {
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40 | public:
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41 |
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42 | /** Additional data which is passed down the BSP tree during traversal.
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43 | */
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44 | struct VspBspTraversalData
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45 | {
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46 | /// the current node
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47 | BspNode *mNode;
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48 | /// polygonal data for splitting
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49 | PolygonContainer *mPolygons;
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50 | /// current depth
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51 | int mDepth;
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52 | /// rays piercing this node
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53 | RayInfoContainer *mRays;
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54 | /// area of current node
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55 | float mArea;
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56 | /// geometry of node as induced by planes
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57 | BspNodeGeometry *mGeometry;
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58 | /// pvs size
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59 | int mPvs;
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60 | /// how often this branch has missed the max-cost ratio
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61 | int mMaxCostMisses;
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62 |
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63 |
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64 | /** Returns average ray contribution.
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65 | */
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66 | float GetAvgRayContribution() const
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67 | {
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68 | return (float)mPvs / ((float)mRays->size() + Limits::Small);
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69 | }
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70 |
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71 |
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72 | VspBspTraversalData():
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73 | mNode(NULL),
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74 | mPolygons(NULL),
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75 | mDepth(0),
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76 | mRays(NULL),
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77 | mPvs(0),
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78 | mArea(0.0),
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79 | mGeometry(NULL),
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80 | mMaxCostMisses(0)
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81 | {}
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82 |
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83 | VspBspTraversalData(BspNode *node,
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84 | PolygonContainer *polys,
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85 | const int depth,
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86 | RayInfoContainer *rays,
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87 | int pvs,
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88 | float area,
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89 | BspNodeGeometry *geom):
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90 | mNode(node),
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91 | mPolygons(polys),
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92 | mDepth(depth),
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93 | mRays(rays),
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94 | mPvs(pvs),
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95 | mArea(area),
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96 | mGeometry(geom),
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97 | mMaxCostMisses(0)
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98 | {}
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99 |
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100 | VspBspTraversalData(PolygonContainer *polys,
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101 | const int depth,
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102 | RayInfoContainer *rays,
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103 | BspNodeGeometry *geom):
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104 | mNode(NULL),
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105 | mPolygons(polys),
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106 | mDepth(depth),
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107 | mRays(rays),
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108 | mPvs(0),
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109 | mArea(0),
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110 | mGeometry(geom),
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111 | mMaxCostMisses(0)
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112 | {}
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113 |
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114 | friend bool operator<(const VspBspTraversalData &a, const VspBspTraversalData &b)
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115 | {
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116 | #if 0
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117 | return a.mPvs * a.mArea < b.mPvs * b.mArea;
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118 | #endif
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119 | #if 1
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120 | return a.mPvs * (int)a.mRays->size() < b.mPvs * (int)b.mRays->size();
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121 | #endif
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122 | #if 0
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123 | return a.mPvs < b.mPvs;
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124 | #endif
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125 | #if 0
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126 | return
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127 | a.mPvs / (float)(a.mRays->size() + Limits::Small())
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128 | >
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129 | b.mPvs / (float)(b.mRays->size() + Limits::Small());
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130 | #endif
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131 | #if 0
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132 | return a.mPvs * (int)a.mRays->size() < b.mPvs * (int)b.mRays->size();
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133 | #endif
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134 | }
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135 | };
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136 |
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137 | typedef std::priority_queue<VspBspTraversalData> VspBspTraversalStack;
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138 | //typedef std::stack<VspBspTraversalData> VspBspTraversalStack;
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139 |
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140 | /** Default constructor creating an empty tree.
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141 | */
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142 | VspBspTree();
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143 |
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144 | /** Default destructor.
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145 | */
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146 | ~VspBspTree();
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147 |
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148 | /** Returns BSP Tree statistics.
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149 | */
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150 | const BspTreeStatistics &GetStatistics() const;
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151 |
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152 |
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153 | /** Constructs the tree from a given set of rays.
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154 | @param sampleRays the set of sample rays the construction is based on
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155 | @param viewCells if not NULL, new view cells are
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156 | created in the leafs and stored in the container
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157 | */
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158 | void Construct(const VssRayContainer &sampleRays);
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159 |
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160 | /** Returns list of BSP leaves.
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161 | */
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162 | void CollectLeaves(vector<BspLeaf *> &leaves) const;
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163 |
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164 | /** Returns box which bounds the whole tree.
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165 | */
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166 | AxisAlignedBox3 GetBoundingBox()const;
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167 |
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168 | /** Returns root of BSP tree.
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169 | */
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170 | BspNode *GetRoot() const;
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171 |
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172 | /** Exports VspBsp tree to file.
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173 | */
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174 | bool Export(const string filename);
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175 |
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176 | /** Collects the leaf view cells of the tree
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177 | @param viewCells returns the view cells
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178 | */
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179 | void CollectViewCells(ViewCellContainer &viewCells) const;
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180 |
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181 | /** A ray is cast possible intersecting the tree.
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182 | @param the ray that is cast.
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183 | @returns the number of intersections with objects stored in the tree.
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184 | */
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185 | int CastRay(Ray &ray);
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186 |
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187 | /// bsp tree construction types
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188 | enum {FROM_INPUT_VIEW_CELLS, FROM_SCENE_GEOMETRY, FROM_SAMPLES};
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189 |
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190 | /** Returns statistics.
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191 | */
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192 | BspTreeStatistics &GetStat();
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193 |
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194 | /** finds neighbouring leaves of this tree node.
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195 | */
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196 | int FindNeighbors(BspNode *n,
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197 | vector<BspLeaf *> &neighbors,
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198 | const bool onlyUnmailed) const;
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199 |
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200 | /** Constructs geometry associated with the half space intersections
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201 | leading to this node.
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202 | */
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203 | void ConstructGeometry(BspNode *n, PolygonContainer &cell) const;
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204 |
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205 | /** Constructs geometry associated with the half space intersections
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206 | leading to this node.
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207 | */
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208 | void ConstructGeometry(BspViewCell *vc, PolygonContainer &cell) const;
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209 |
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210 | /** Construct geometry and stores it in a geometry node container.
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211 | */
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212 | void ConstructGeometry(BspNode *n, BspNodeGeometry &cell) const;
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213 |
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214 | /** Returns random leaf of BSP tree.
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215 | @param halfspace defines the halfspace from which the leaf is taken.
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216 | */
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217 | BspLeaf *GetRandomLeaf(const Plane3 &halfspace);
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218 |
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219 | /** Returns random leaf of BSP tree.
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220 | @param onlyUnmailed if only unmailed leaves should be returned.
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221 | */
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222 | BspLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
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223 |
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224 | /** Traverses tree and counts all view cells as well as their PVS size.
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225 | */
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226 | void EvaluateViewCellsStats(ViewCellsStatistics &stat) const;
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227 |
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228 |
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229 | /** Returns view cell corresponding to unbounded space.
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230 | */
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231 | BspViewCell *GetRootCell() const;
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232 |
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233 | /** Returns epsilon of this tree.
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234 | */
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235 | float GetEpsilon() const;
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236 |
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237 |
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238 | int
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239 | CastLineSegment(const Vector3 &origin,
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240 | const Vector3 &termination,
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241 | ViewCellContainer &viewcells
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242 | );
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243 |
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244 | protected:
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245 |
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246 | // --------------------------------------------------------------
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247 | // For sorting objects
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248 | // --------------------------------------------------------------
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249 | struct SortableEntry
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250 | {
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251 | enum {POLY_MIN, POLY_MAX};
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252 |
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253 | int type;
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254 | float value;
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255 | Polygon3 *poly;
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256 | SortableEntry() {}
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257 | SortableEntry(const int t, const float v, Polygon3 *poly):
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258 | type(t), value(v), poly(poly) {}
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259 |
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260 | bool operator<(const SortableEntry &b) const
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261 | {
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262 | return value < b.value;
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263 | }
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264 | };
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265 |
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266 | /** Evaluates tree stats in the BSP tree leafs.
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267 | */
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268 | void EvaluateLeafStats(const VspBspTraversalData &data);
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269 |
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270 | /** Subdivides node with respect to the traversal data.
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271 | @param tStack current traversal stack
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272 | @param tData traversal data also holding node to be subdivided
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273 | @returns new root of the subtree
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274 | */
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275 | BspNode *Subdivide(VspBspTraversalStack &tStack,
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276 | VspBspTraversalData &tData);
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277 |
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278 | /** Constructs the tree from the given traversal data.
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279 | @param polys stores set of polygons on which subdivision may be based
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280 | @param rays storesset of rays on which subdivision may be based
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281 | */
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282 | void Construct(const PolygonContainer &polys, RayInfoContainer *rays);
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283 |
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284 | /** Selects the best possible splitting plane.
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285 | @param plane returns the split plane
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286 | @param leaf the leaf to be split
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287 | @param polys the polygon list on which the split decition is based
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288 | @param rays ray container on which selection may be based
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289 | @note the polygons can be reordered in the process
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290 | @returns true if the cost of the split is under maxCostRatio
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291 |
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292 | */
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293 | bool SelectPlane(Plane3 &plane,
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294 | BspLeaf *leaf,
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295 | VspBspTraversalData &data);
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296 |
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297 | /** Strategies where the effect of the split plane is tested
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298 | on all input rays.
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299 |
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300 | @returns the cost of the candidate split plane
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301 | */
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302 | float SplitPlaneCost(const Plane3 &candidatePlane,
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303 | const VspBspTraversalData &data);
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304 |
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305 |
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306 | /** Subdivide leaf.
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307 | @param leaf the leaf to be subdivided
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308 |
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309 | @param polys the polygons to be split
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310 | @param frontPolys returns the polygons in front of the split plane
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311 | @param backPolys returns the polygons in the back of the split plane
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312 |
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313 | @param rays the polygons to be filtered
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314 | @param frontRays returns the polygons in front of the split plane
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315 | @param backRays returns the polygons in the back of the split plane
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316 |
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317 | @returns the root of the subdivision
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318 | */
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319 |
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320 | BspNode *SubdivideNode(VspBspTraversalData &tData,
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321 | VspBspTraversalData &frontData,
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322 | VspBspTraversalData &backData,
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323 | PolygonContainer &coincident);
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324 |
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325 | /** Selects the split plane in order to construct a tree with
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326 | certain characteristics (e.g., balanced tree, least splits,
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327 | 2.5d aligned)
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328 | @param bestPlane returns the split plane
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329 | @param polygons container of polygons
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330 | @param rays bundle of rays on which the split can be based
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331 |
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332 | @returns true if the overall cost is under maxCostRatio
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333 | */
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334 | bool SelectPlaneHeuristics(Plane3 &bestPlane,
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335 | BspLeaf *leaf,
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336 | VspBspTraversalData &data);
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337 |
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338 | /** Extracts the meshes of the objects and adds them to polygons.
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339 | Adds object aabb to the aabb of the tree.
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340 | @param maxPolys the maximal number of objects to be stored as polygons
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341 | @returns the number of polygons
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342 | */
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343 | int AddToPolygonSoup(const ObjectContainer &objects,
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344 | PolygonContainer &polys,
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345 | int maxObjects = 0);
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346 |
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347 | /** Extracts the meshes of the view cells and and adds them to polygons.
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348 | Adds view cell aabb to the aabb of the tree.
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349 | @param maxPolys the maximal number of objects to be stored as polygons
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350 | @returns the number of polygons
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351 | */
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352 | int AddToPolygonSoup(const ViewCellContainer &viewCells,
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353 | PolygonContainer &polys,
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354 | int maxObjects = 0);
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355 |
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356 | /** Extract polygons of this mesh and add to polygon container.
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357 | @param mesh the mesh that drives the polygon construction
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358 | @param parent the parent intersectable this polygon is constructed from
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359 | @returns number of polygons
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360 | */
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361 | int AddMeshToPolygons(Mesh *mesh, PolygonContainer &polys, MeshInstance *parent);
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362 |
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363 | /** Computes best cost ratio for the suface area heuristics for axis aligned
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364 | splits. This heuristics minimizes the cost for ray traversal.
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365 | @param polys the polygons guiding the ratio computation
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366 | @param box the bounding box of the leaf
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367 | @param axis the current split axis
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368 | @param position returns the split position
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369 | @param objectsBack the number of objects in the back of the split plane
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370 | @param objectsFront the number of objects in the front of the split plane
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371 | */
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372 | float BestCostRatio(const PolygonContainer &polys,
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373 | const AxisAlignedBox3 &box,
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374 | const int axis,
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375 | float &position,
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376 | int &objectsBack,
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377 | int &objectsFront) const;
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378 |
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379 | /** Sorts split candidates for surface area heuristics for axis aligned splits.
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380 | @param polys the input for choosing split candidates
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381 | @param axis the current split axis
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382 | @param splitCandidates returns sorted list of split candidates
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383 | */
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384 | void SortSplitCandidates(const PolygonContainer &polys,
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385 | const int axis,
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386 | vector<SortableEntry> &splitCandidates) const;
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387 |
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388 | /** Selects an axis aligned split plane.
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389 | Returns true if split is valied
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390 | */
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391 | bool SelectAxisAlignedPlane(Plane3 &plane, const PolygonContainer &polys) const;
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392 |
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393 | /** Subdivides the rays into front and back rays according to the split plane.
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394 |
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395 | @param plane the split plane
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396 | @param rays contains the rays to be split. The rays are
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397 | distributed into front and back rays.
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398 | @param frontRays returns rays on the front side of the plane
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399 | @param backRays returns rays on the back side of the plane
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400 |
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401 | @returns the number of splits
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402 | */
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403 | int SplitRays(const Plane3 &plane,
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404 | RayInfoContainer &rays,
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405 | RayInfoContainer &frontRays,
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406 | RayInfoContainer &backRays);
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407 |
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408 |
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409 | /** Extracts the split planes representing the space bounded by node n.
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410 | */
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411 | void ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const;
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412 |
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413 | /** Adds the object to the pvs of the front and back leaf with a given classification.
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414 |
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415 | @param obj the object to be added
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416 | @param cf the ray classification regarding the split plane
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417 | @param frontPvs returns the PVS of the front partition
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418 | @param backPvs returns the PVS of the back partition
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419 |
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420 | */
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421 | void AddObjToPvs(Intersectable *obj, const int cf, int &frontPvs, int &backPvs) const;
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422 |
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423 | /** Computes PVS size induced by the rays.
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424 | */
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425 | int ComputePvsSize(const RayInfoContainer &rays) const;
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426 |
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427 | /** Returns true if tree can be terminated.
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428 | */
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429 | inline bool TerminationCriteriaMet(const VspBspTraversalData &data, const int numLeaves) const;
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430 |
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431 | /** Computes accumulated ray lenght of this rays.
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432 | */
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433 | float AccumulatedRayLength(const RayInfoContainer &rays) const;
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434 |
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435 | /** Splits polygons with respect to the split plane.
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436 |
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437 | @param plane the split plane
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438 | @param polys the polygons to be split. the polygons are consumed and
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439 | distributed to the containers frontPolys, backPolys, coincident.
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440 | @param frontPolys returns the polygons in the front of the split plane
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441 | @param backPolys returns the polygons in the back of the split plane
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442 | @param coincident returns the polygons coincident to the split plane
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443 |
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444 | @returns the number of splits
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445 | */
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446 | int SplitPolygons(const Plane3 &plane,
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447 | PolygonContainer &polys,
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448 | PolygonContainer &frontPolys,
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449 | PolygonContainer &backPolys,
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450 | PolygonContainer &coincident) const;
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451 |
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452 | /** Adds ray sample contributions to the PVS.
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453 | @param sampleContributions the number contributions of the samples
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454 | @param contributingSampels the number of contributing rays
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455 |
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456 | */
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457 | void AddToPvs(BspLeaf *leaf,
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458 | const RayInfoContainer &rays,
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459 | int &sampleContributions,
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460 | int &contributingSamples);
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461 |
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462 |
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463 | /** Take 3 ray endpoints, where two are minimum and one a maximum
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464 | point or the other way round.
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465 | */
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466 | Plane3 ChooseCandidatePlane(const RayInfoContainer &rays) const;
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467 |
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468 | /** Take plane normal as plane normal and the midpoint of the ray.
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469 | PROBLEM: does not resemble any point where visibility is likely to change
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470 | */
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471 | Plane3 ChooseCandidatePlane2(const RayInfoContainer &rays) const;
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472 |
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473 | /** Fit the plane between the two lines so that the plane has equal shortest
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474 | distance to both lines.
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475 | */
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476 | Plane3 ChooseCandidatePlane3(const RayInfoContainer &rays) const;
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477 |
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478 | /// Pointer to the root of the tree
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479 | BspNode *mRoot;
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480 |
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481 | BspTreeStatistics mStat;
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482 |
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483 | /// Strategies for choosing next split plane.
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484 | enum {NO_STRATEGY = 0,
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485 | RANDOM_POLYGON = 1,
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486 | AXIS_ALIGNED = 2,
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487 | LEAST_RAY_SPLITS = 256,
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488 | BALANCED_RAYS = 512,
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489 | PVS = 1024
|
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490 | };
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491 |
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492 | /// box around the whole view domain
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493 | AxisAlignedBox3 mBox;
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494 |
|
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495 | /// view cell corresponding to unbounded space
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496 | BspViewCell *mRootCell;
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497 |
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498 | /// minimal number of rays before subdivision termination
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499 | int mTermMinRays;
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500 | /// maximal possible depth
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501 | int mTermMaxDepth;
|
---|
502 | /// mininum area
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503 | float mTermMinArea;
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504 | /// mininum PVS
|
---|
505 | int mTermMinPvs;
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506 |
|
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507 | /// minimal number of rays for axis aligned split
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508 | int mTermMinRaysForAxisAligned;
|
---|
509 | /// minimal number of objects for axis aligned split
|
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510 | int mTermMinObjectsForAxisAligned;
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511 | /// maximal contribution per ray
|
---|
512 | float mTermMaxRayContribution;
|
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513 | /// minimal accumulated ray length
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514 | float mTermMinAccRayLength;
|
---|
515 |
|
---|
516 | /// strategy to get the best split plane
|
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517 | int mSplitPlaneStrategy;
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518 | /// number of candidates evaluated for the next split plane
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519 | int mMaxPolyCandidates;
|
---|
520 | /// number of candidates for split planes evaluated using the rays
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521 | int mMaxRayCandidates;
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522 | /// balancing factor for PVS criterium
|
---|
523 | float mCtDivCi;
|
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524 |
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525 | //-- axis aligned split criteria
|
---|
526 | float mAxisAlignedCtDivCi;
|
---|
527 | /// spezifies the split border of the axis aligned split
|
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528 | float mAxisAlignedSplitBorder;
|
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529 |
|
---|
530 | /// maximal acceptable cost ratio
|
---|
531 | float mTermMaxCostRatio;
|
---|
532 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
533 | int mTermMissTolerance;
|
---|
534 |
|
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535 | //-- factors guiding the split plane heuristics
|
---|
536 | float mLeastRaySplitsFactor;
|
---|
537 | float mBalancedRaysFactor;
|
---|
538 | float mPvsFactor;
|
---|
539 |
|
---|
540 | /// if area or accumulated ray lenght should be used for PVS heuristics
|
---|
541 | bool mPvsUseArea;
|
---|
542 | /// tolerance for polygon split
|
---|
543 | float mEpsilon;
|
---|
544 | /// maximal number of test rays used to evaluate candidate split plane
|
---|
545 | int mMaxTests;
|
---|
546 | /// number of different bsp split plane criteria
|
---|
547 | int mNumCriteria;
|
---|
548 | /// maximal number of view cells
|
---|
549 | int mMaxViewCells;
|
---|
550 |
|
---|
551 | private:
|
---|
552 |
|
---|
553 | static const float sLeastRaySplitsTable[5];
|
---|
554 | /** Evaluates split plane classification with respect to the plane's
|
---|
555 | contribution for balanced rays.
|
---|
556 | */
|
---|
557 | static const float sBalancedRaysTable[5];
|
---|
558 |
|
---|
559 | /// Generates unique ids for PVS criterium
|
---|
560 | static void GenerateUniqueIdsForPvs();
|
---|
561 |
|
---|
562 | //-- unique ids for PVS criterium
|
---|
563 | static int sFrontId;
|
---|
564 | static int sBackId;
|
---|
565 | static int sFrontAndBackId;
|
---|
566 | };
|
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567 |
|
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568 | #endif
|
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