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 | class ViewCellsManager;
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23 | class BspMergeCandidate;
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24 | struct BspRay;
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25 |
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26 |
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27 | /**
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28 | This is a view space partitioning specialised BSPtree.
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29 | There are no polygon splits, but we split the sample rays.
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30 | The candidates for the next split plane are evaluated only
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31 | by checking the sampled visibility information.
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32 | The polygons are employed merely as candidates for the next split planes.
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33 | */
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34 | class VspBspTree
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35 | {
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36 | friend class ViewCellsParseHandlers;
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37 |
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38 | public:
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39 |
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40 | /** Additional data which is passed down the BSP tree during traversal.
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41 | */
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42 | struct VspBspTraversalData
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43 | {
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44 | /// the current node
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45 | BspNode *mNode;
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46 | /// polygonal data for splitting
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47 | PolygonContainer *mPolygons;
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48 | /// current depth
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49 | int mDepth;
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50 | /// rays piercing this node
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51 | RayInfoContainer *mRays;
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52 | /// area of current node
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53 | float mArea;
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54 | /// geometry of node as induced by planes
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55 | BspNodeGeometry *mGeometry;
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56 | /// pvs size
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57 | int mPvs;
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58 | /// how often this branch has missed the max-cost ratio
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59 | int mMaxCostMisses;
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60 |
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61 | /** Returns average ray contribution.
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62 | */
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63 | float GetAvgRayContribution() const
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64 | {
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65 | return (float)mPvs / ((float)mRays->size() + Limits::Small);
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66 | }
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67 |
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68 |
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69 | VspBspTraversalData():
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70 | mNode(NULL),
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71 | mPolygons(NULL),
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72 | mDepth(0),
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73 | mRays(NULL),
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74 | mPvs(0),
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75 | mArea(0.0),
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76 | mGeometry(NULL),
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77 | mMaxCostMisses(0)
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78 | {}
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79 |
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80 | VspBspTraversalData(BspNode *node,
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81 | PolygonContainer *polys,
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82 | const int depth,
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83 | RayInfoContainer *rays,
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84 | int pvs,
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85 | float area,
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86 | BspNodeGeometry *geom):
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87 | mNode(node),
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88 | mPolygons(polys),
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89 | mDepth(depth),
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90 | mRays(rays),
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91 | mPvs(pvs),
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92 | mArea(area),
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93 | mGeometry(geom),
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94 | mMaxCostMisses(0)
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95 | {}
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96 |
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97 | VspBspTraversalData(PolygonContainer *polys,
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98 | const int depth,
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99 | RayInfoContainer *rays,
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100 | BspNodeGeometry *geom):
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101 | mNode(NULL),
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102 | mPolygons(polys),
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103 | mDepth(depth),
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104 | mRays(rays),
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105 | mPvs(0),
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106 | mArea(0),
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107 | mGeometry(geom),
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108 | mMaxCostMisses(0)
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109 | {}
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110 |
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111 | /** Returns cost of the traversal data.
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112 | */
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113 | float GetCost() const
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114 | {
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115 | #if 1
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116 | return mPvs * mArea;
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117 | #endif
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118 | #if 0
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119 | return (float)(mPvs * (int)mRays->size());
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120 | #endif
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121 | #if 0
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122 | return (float)mPvs;
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123 | #endif
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124 | #if 0
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125 | return mArea * (float)mRays->size();
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126 | #endif
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127 | }
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128 |
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129 | // deletes contents and sets them to NULL
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130 | void Clear()
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131 | {
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132 | DEL_PTR(mPolygons);
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133 | DEL_PTR(mRays);
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134 | DEL_PTR(mGeometry);
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135 | }
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136 |
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137 | friend bool operator<(const VspBspTraversalData &a, const VspBspTraversalData &b)
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138 | {
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139 | return a.GetCost() < b.GetCost();
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140 | }
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141 | };
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142 |
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143 | typedef std::priority_queue<VspBspTraversalData> VspBspTraversalStack;
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144 | //typedef std::stack<VspBspTraversalData> VspBspTraversalStack;
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145 |
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146 | /** Default constructor creating an empty tree.
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147 | */
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148 | VspBspTree();
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149 |
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150 | /** Default destructor.
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151 | */
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152 | ~VspBspTree();
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153 |
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154 | /** Returns BSP Tree statistics.
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155 | */
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156 | const BspTreeStatistics &GetStatistics() const;
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157 |
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158 |
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159 | /** Constructs the tree from a given set of rays.
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160 | @param sampleRays the set of sample rays the construction is based on
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161 | @param viewCells if not NULL, new view cells are
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162 | created in the leafs and stored in the container
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163 | */
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164 | void Construct(const VssRayContainer &sampleRays,
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165 | AxisAlignedBox3 *forcedBoundingBox);
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166 |
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167 | /** Returns list of BSP leaves with pvs smaller than
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168 | a certain threshold.
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169 | @param onlyUnmailed if only the unmailed leaves should be considered
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170 | @param maxPvs the maximal pvs (-1 means unlimited)
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171 | */
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172 | void CollectLeaves(vector<BspLeaf *> &leaves,
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173 | const bool onlyUnmailed = false,
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174 | const int maxPvs = -1) const;
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175 |
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176 | /** Returns box which bounds the whole tree.
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177 | */
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178 | AxisAlignedBox3 GetBoundingBox()const;
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179 |
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180 | /** Returns root of BSP tree.
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181 | */
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182 | BspNode *GetRoot() const;
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183 |
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184 | /** Collects the leaf view cells of the tree
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185 | @param viewCells returns the view cells
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186 | */
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187 | void CollectViewCells(ViewCellContainer &viewCells) const;
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188 |
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189 | /** A ray is cast possible intersecting the tree.
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190 | @param the ray that is cast.
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191 | @returns the number of intersections with objects stored in the tree.
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192 | */
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193 | int CastRay(Ray &ray);
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194 |
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195 | /// bsp tree construction types
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196 | enum {FROM_INPUT_VIEW_CELLS, FROM_SCENE_GEOMETRY, FROM_SAMPLES};
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197 |
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198 | /** finds neighbouring leaves of this tree node.
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199 | */
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200 | int FindNeighbors(BspNode *n,
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201 | vector<BspLeaf *> &neighbors,
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202 | const bool onlyUnmailed) const;
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203 |
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204 | /** Constructs geometry associated with the half space intersections
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205 | leading to this node.
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206 | */
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207 | void ConstructGeometry(BspNode *n, BspNodeGeometry &geom) const;
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208 |
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209 | /** Construct geometry of view cell.
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210 | */
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211 | void ConstructGeometry(BspViewCell *vc, BspNodeGeometry &geom) const;
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212 |
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213 | /** Returns random leaf of BSP tree.
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214 | @param halfspace defines the halfspace from which the leaf is taken.
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215 | */
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216 | BspLeaf *GetRandomLeaf(const Plane3 &halfspace);
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217 |
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218 | /** Returns random leaf of BSP tree.
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219 | @param onlyUnmailed if only unmailed leaves should be returned.
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220 | */
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221 | BspLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
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222 |
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223 | /** Returns epsilon of this tree.
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224 | */
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225 | float GetEpsilon() const;
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226 |
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227 | /** Casts line segment into the tree.
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228 | @param origin the origin of the line segment
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229 | @param termination the end point of the line segment
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230 | @returns view cells intersecting the line segment.
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231 | */
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232 | int CastLineSegment(const Vector3 &origin,
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233 | const Vector3 &termination,
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234 | ViewCellContainer &viewcells);
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235 |
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236 |
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237 | /** Sets pointer to view cells manager.
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238 | */
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239 | void SetViewCellsManager(ViewCellsManager *vcm);
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240 |
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241 | /** Returns distance from node 1 to node 2.
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242 | */
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243 | int TreeDistance(BspNode *n1, BspNode *n2) const;
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244 |
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245 | /** Merges view cells according to some cost heuristics.
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246 | */
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247 | int MergeViewCells(const VssRayContainer &rays);
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248 |
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249 | /** Refines view cells using shuffling, i.e., border leaves
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250 | of two view cells are exchanged if the resulting view cells
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251 | are tested to be "better" than the old ones.
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252 | @returns number of refined view cells
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253 | */
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254 | int RefineViewCells(const VssRayContainer &rays);
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255 |
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256 | /** Collapses the tree with respect to the view cell partition.
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257 | @returns number of collapsed nodes
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258 | */
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259 | int CollapseTree();
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260 |
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261 | /** Returns view cell the current point is located in.
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262 | */
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263 | ViewCell *GetViewCell(const Vector3 &point);
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264 |
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265 | /** Constructs bsp rays for post processing and visualization.
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266 | */
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267 | void ConstructBspRays(vector<BspRay *> &bspRays,
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268 | const VssRayContainer &rays);
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269 |
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270 | /** Merge view cells of leaves l1 and l2.
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271 | */
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272 | bool MergeViewCells(BspLeaf *l1, BspLeaf *l2) const;
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273 |
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274 | /** Returns true if this view point is in a valid view space,
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275 | false otherwise.
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276 | */
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277 | bool ViewPointValid(const Vector3 &viewPoint) const;
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278 |
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279 | /** Returns view cell corresponding to
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280 | the invalid view space.
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281 | */
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282 | BspViewCell *GetOutOfBoundsCell();
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283 |
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284 | /** Writes tree to output stream
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285 | */
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286 | bool Export(ofstream &stream);
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287 |
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288 | protected:
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289 |
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290 | // --------------------------------------------------------------
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291 | // For sorting objects
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292 | // --------------------------------------------------------------
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293 | struct SortableEntry
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294 | {
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295 | enum EType
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296 | {
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297 | ERayMin,
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298 | ERayMax
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299 | };
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300 |
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301 | int type;
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302 | float value;
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303 | VssRay *ray;
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304 |
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305 | SortableEntry() {}
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306 | SortableEntry(const int t, const float v, VssRay *r):type(t),
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307 | value(v), ray(r)
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308 | {
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309 | }
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310 |
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311 | friend bool operator<(const SortableEntry &a, const SortableEntry &b)
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312 | {
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313 | return a.value < b.value;
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314 | }
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315 | };
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316 |
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317 | /** Returns view cell corresponding to
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318 | the invalid view space. If it does not exist, it is created.
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319 | */
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320 | BspViewCell *GetOrCreateOutOfBoundsCell();
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321 |
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322 | /** Collapses the tree with respect to the view cell partition,
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323 | i.e. leaves having the same view cell are collapsed.
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324 | @param node the root of the subtree to be collapsed
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325 | @param collapsed returns the number of collapsed nodes
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326 | @returns node of type leaf if the node could be collapsed,
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327 | this node otherwise
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328 | */
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329 | BspNode *CollapseTree(BspNode *node, int &collapsed);
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330 |
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331 | /** Shuffles the leaves, i.e., tests if exchanging
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332 | the leaves helps in improving the view cells.
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333 | */
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334 | bool ShuffleLeaves(BspLeaf *leaf1, BspLeaf *leaf2) const;
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335 |
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336 | /** Helper function revalidating the view cell leaf list after merge.
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337 | */
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338 | void RepairViewCellsLeafLists();
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339 |
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340 | /** Evaluates tree stats in the BSP tree leafs.
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341 | */
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342 | void EvaluateLeafStats(const VspBspTraversalData &data);
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343 |
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344 | /** Subdivides node with respect to the traversal data.
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345 | @param tStack current traversal stack
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346 | @param tData traversal data also holding node to be subdivided
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347 | @returns new root of the subtree
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348 | */
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349 | BspNode *Subdivide(VspBspTraversalStack &tStack,
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350 | VspBspTraversalData &tData);
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351 |
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352 | /** Constructs the tree from the given traversal data.
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353 | @param polys stores set of polygons on which subdivision may be based
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354 | @param rays storesset of rays on which subdivision may be based
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355 | */
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356 | void Construct(const PolygonContainer &polys, RayInfoContainer *rays);
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357 |
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358 | /** Selects the best possible splitting plane.
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359 | @param plane returns the split plane
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360 | @param leaf the leaf to be split
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361 | @param polys the polygon list on which the split decition is based
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362 | @param rays ray container on which selection may be based
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363 | @note the polygons can be reordered in the process
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364 | @returns true if the cost of the split is under maxCostRatio
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365 |
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366 | */
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367 | bool SelectPlane(Plane3 &plane,
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368 | BspLeaf *leaf,
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369 | VspBspTraversalData &data,
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370 | VspBspTraversalData &frontData,
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371 | VspBspTraversalData &backData);
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372 |
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373 | /** Strategies where the effect of the split plane is tested
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374 | on all input rays.
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375 |
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376 | @returns the cost of the candidate split plane
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377 | */
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378 | float SplitPlaneCost(const Plane3 &candidatePlane,
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379 | const VspBspTraversalData &data,
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380 | BspNodeGeometry &geomFront,
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381 | BspNodeGeometry &geomBack,
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382 | float &areaFront,
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383 | float &areaBack) const;
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384 |
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385 | /** Subdivide leaf.
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386 | @param leaf the leaf to be subdivided
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387 |
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388 | @param polys the polygons to be split
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389 | @param frontPolys returns the polygons in front of the split plane
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390 | @param backPolys returns the polygons in the back of the split plane
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391 |
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392 | @param rays the polygons to be filtered
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393 | @param frontRays returns the polygons in front of the split plane
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394 | @param backRays returns the polygons in the back of the split plane
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395 |
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396 | @returns the root of the subdivision
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397 | */
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398 |
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399 | BspNode *SubdivideNode(VspBspTraversalData &tData,
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400 | VspBspTraversalData &frontData,
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401 | VspBspTraversalData &backData,
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402 | PolygonContainer &coincident);
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403 |
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404 | /** Extracts the meshes of the objects and adds them to polygons.
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405 | Adds object aabb to the aabb of the tree.
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406 | @param maxPolys the maximal number of objects to be stored as polygons
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407 | @returns the number of polygons
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408 | */
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409 | int AddToPolygonSoup(const ObjectContainer &objects,
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410 | PolygonContainer &polys,
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411 | int maxObjects = 0);
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412 |
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413 | /** Extracts the meshes of the view cells and and adds them to polygons.
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414 | Adds view cell aabb to the aabb of the tree.
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415 | @param maxPolys the maximal number of objects to be stored as polygons
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416 | @returns the number of polygons
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417 | */
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418 | int AddToPolygonSoup(const ViewCellContainer &viewCells,
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419 | PolygonContainer &polys,
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420 | int maxObjects = 0);
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421 |
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422 | /** Extract polygons of this mesh and add to polygon container.
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423 | @param mesh the mesh that drives the polygon construction
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424 | @param parent the parent intersectable this polygon is constructed from
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425 | @returns number of polygons
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426 | */
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427 | int AddMeshToPolygons(Mesh *mesh, PolygonContainer &polys, MeshInstance *parent);
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428 |
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429 | /** Selects an axis aligned for the next split.
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430 | @returns cost for this split
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431 | */
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432 | float SelectAxisAlignedPlane(Plane3 &plane,
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433 | const VspBspTraversalData &tData,
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434 | int &axis,
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435 | BspNodeGeometry **frontGeom,
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436 | BspNodeGeometry **backGeom,
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437 | float &frontArea,
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438 | float &backArea);
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439 |
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440 | /** Sorts split candidates for surface area heuristics for axis aligned splits.
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441 | @param polys the input for choosing split candidates
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442 | @param axis the current split axis
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443 | @param splitCandidates returns sorted list of split candidates
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444 | */
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445 | void SortSplitCandidates(const RayInfoContainer &rays, const int axis);
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446 |
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447 | /** Computes best cost for axis aligned planes.
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448 | */
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449 | float BestCostRatioHeuristics(const RayInfoContainer &rays,
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450 | const AxisAlignedBox3 &box,
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451 | const int pvsSize,
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452 | const int &axis,
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453 | float &position);
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454 |
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455 | /** Evaluates cost ratio for axis aligned splits.
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456 | */
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457 | /*float EvalCostRatio(const VspBspTraversalData &tData,
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458 | const AxisAlignedBox3 &box,
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459 | const int axis,
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460 | const float position,
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461 | int &raysBack,
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462 | int &raysFront,
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463 | int &pvsBack,
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464 | int &pvsFront);*/
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465 |
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466 | /** Selects an axis aligned split plane.
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467 | @Returns true if split is valied
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468 | */
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469 | bool SelectAxisAlignedPlane(Plane3 &plane, const PolygonContainer &polys) const;
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470 |
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471 | /** Subdivides the rays into front and back rays according to the split plane.
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472 |
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473 | @param plane the split plane
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474 | @param rays contains the rays to be split. The rays are
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475 | distributed into front and back rays.
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476 | @param frontRays returns rays on the front side of the plane
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477 | @param backRays returns rays on the back side of the plane
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478 |
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479 | @returns the number of splits
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480 | */
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481 | int SplitRays(const Plane3 &plane,
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482 | RayInfoContainer &rays,
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483 | RayInfoContainer &frontRays,
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484 | RayInfoContainer &backRays);
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485 |
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486 |
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487 | /** Extracts the split planes representing the space bounded by node n.
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488 | */
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489 | void ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const;
|
---|
490 |
|
---|
491 | /** Adds the object to the pvs of the front and back leaf with a given classification.
|
---|
492 |
|
---|
493 | @param obj the object to be added
|
---|
494 | @param cf the ray classification regarding the split plane
|
---|
495 | @param frontPvs returns the PVS of the front partition
|
---|
496 | @param backPvs returns the PVS of the back partition
|
---|
497 |
|
---|
498 | */
|
---|
499 | void AddObjToPvs(Intersectable *obj,
|
---|
500 | const int cf,
|
---|
501 | int &frontPvs,
|
---|
502 | int &backPvs,
|
---|
503 | int &totalPvs) const;
|
---|
504 |
|
---|
505 | /** Computes PVS size induced by the rays.
|
---|
506 | */
|
---|
507 | int ComputePvsSize(const RayInfoContainer &rays) const;
|
---|
508 |
|
---|
509 | /** Returns true if tree can be terminated.
|
---|
510 | */
|
---|
511 | inline bool TerminationCriteriaMet(const VspBspTraversalData &data) const;
|
---|
512 |
|
---|
513 | /** Computes accumulated ray lenght of this rays.
|
---|
514 | */
|
---|
515 | float AccumulatedRayLength(const RayInfoContainer &rays) const;
|
---|
516 |
|
---|
517 | /** Splits polygons with respect to the split plane.
|
---|
518 |
|
---|
519 | @param plane the split plane
|
---|
520 | @param polys the polygons to be split. the polygons are consumed and
|
---|
521 | distributed to the containers frontPolys, backPolys, coincident.
|
---|
522 | @param frontPolys returns the polygons in the front of the split plane
|
---|
523 | @param backPolys returns the polygons in the back of the split plane
|
---|
524 | @param coincident returns the polygons coincident to the split plane
|
---|
525 |
|
---|
526 | @returns the number of splits
|
---|
527 | */
|
---|
528 | int SplitPolygons(const Plane3 &plane,
|
---|
529 | PolygonContainer &polys,
|
---|
530 | PolygonContainer &frontPolys,
|
---|
531 | PolygonContainer &backPolys,
|
---|
532 | PolygonContainer &coincident) const;
|
---|
533 |
|
---|
534 | /** Adds ray sample contributions to the PVS.
|
---|
535 | @param sampleContributions the number contributions of the samples
|
---|
536 | @param contributingSampels the number of contributing rays
|
---|
537 |
|
---|
538 | */
|
---|
539 | void AddToPvs(BspLeaf *leaf,
|
---|
540 | const RayInfoContainer &rays,
|
---|
541 | int &sampleContributions,
|
---|
542 | int &contributingSamples);
|
---|
543 |
|
---|
544 |
|
---|
545 | /** Collects candidates for the merge in the merge queue.
|
---|
546 | @param leaves the leaves to be merged
|
---|
547 | @returns number of leaves in queue
|
---|
548 | */
|
---|
549 | int CollectMergeCandidates(const vector<BspLeaf *> leaves);
|
---|
550 | /** Collects candidates for the merge in the merge queue.
|
---|
551 | @returns number of leaves in queue
|
---|
552 | */
|
---|
553 | int CollectMergeCandidates(const VssRayContainer &rays);
|
---|
554 |
|
---|
555 | /** Take 3 ray endpoints, where two are minimum and one a maximum
|
---|
556 | point or the other way round.
|
---|
557 | */
|
---|
558 | Plane3 ChooseCandidatePlane(const RayInfoContainer &rays) const;
|
---|
559 |
|
---|
560 | /** Take plane normal as plane normal and the midpoint of the ray.
|
---|
561 | PROBLEM: does not resemble any point where visibility is
|
---|
562 | likely to change
|
---|
563 | */
|
---|
564 | Plane3 ChooseCandidatePlane2(const RayInfoContainer &rays) const;
|
---|
565 |
|
---|
566 | /** Fit the plane between the two lines so that the plane
|
---|
567 | has equal shortest distance to both lines.
|
---|
568 | */
|
---|
569 | Plane3 ChooseCandidatePlane3(const RayInfoContainer &rays) const;
|
---|
570 |
|
---|
571 | /** Shuffles, i.e. takes border leaf from view cell 1 and adds it
|
---|
572 | to view cell 2.
|
---|
573 | */
|
---|
574 | void ShuffleLeaf(BspLeaf *leaf,
|
---|
575 | BspViewCell *vc1,
|
---|
576 | BspViewCell *vc2) const;
|
---|
577 |
|
---|
578 | /**
|
---|
579 | Checks if this traversal data corresponds to
|
---|
580 | a valid view space region.
|
---|
581 | */
|
---|
582 | bool CheckValid(const VspBspTraversalData &data) const;
|
---|
583 |
|
---|
584 | /** Propagates valid flag up the tree.
|
---|
585 | */
|
---|
586 | void PropagateUpValidity(BspNode *node);
|
---|
587 |
|
---|
588 | /** Writes the node to disk
|
---|
589 | @note: should be implemented as visitor
|
---|
590 | */
|
---|
591 | void ExportNode(BspNode *node, ofstream &stream);
|
---|
592 |
|
---|
593 | /** Returns memory usage of tree.
|
---|
594 | */
|
---|
595 | float GetMemUsage() const;
|
---|
596 |
|
---|
597 | /// Pointer to the root of the tree
|
---|
598 | BspNode *mRoot;
|
---|
599 |
|
---|
600 | BspTreeStatistics mStat;
|
---|
601 |
|
---|
602 | /// Strategies for choosing next split plane.
|
---|
603 | enum {NO_STRATEGY = 0,
|
---|
604 | RANDOM_POLYGON = 1,
|
---|
605 | AXIS_ALIGNED = 2,
|
---|
606 | LEAST_RAY_SPLITS = 256,
|
---|
607 | BALANCED_RAYS = 512,
|
---|
608 | PVS = 1024
|
---|
609 | };
|
---|
610 |
|
---|
611 | /// box around the whole view domain
|
---|
612 | AxisAlignedBox3 mBox;
|
---|
613 |
|
---|
614 | /// minimal number of rays before subdivision termination
|
---|
615 | int mTermMinRays;
|
---|
616 | /// maximal possible depth
|
---|
617 | int mTermMaxDepth;
|
---|
618 | /// mininum area
|
---|
619 | float mTermMinArea;
|
---|
620 | /// mininum PVS
|
---|
621 | int mTermMinPvs;
|
---|
622 | /// maximal contribution per ray
|
---|
623 | float mTermMaxRayContribution;
|
---|
624 | /// minimal accumulated ray length
|
---|
625 | float mTermMinAccRayLength;
|
---|
626 |
|
---|
627 | //-- termination criteria for axis aligned split
|
---|
628 |
|
---|
629 | /// minimal number of rays for axis aligned split
|
---|
630 | int mTermMinRaysForAxisAligned;
|
---|
631 | // max ray contribution
|
---|
632 | float mTermMaxRayContriForAxisAligned;
|
---|
633 |
|
---|
634 | /// strategy to get the best split plane
|
---|
635 | int mSplitPlaneStrategy;
|
---|
636 | /// number of candidates evaluated for the next split plane
|
---|
637 | int mMaxPolyCandidates;
|
---|
638 | /// number of candidates for split planes evaluated using the rays
|
---|
639 | int mMaxRayCandidates;
|
---|
640 | /// balancing factor for PVS criterium
|
---|
641 | float mCtDivCi;
|
---|
642 |
|
---|
643 | //-- axis aligned split criteria
|
---|
644 | float mAxisAlignedCtDivCi;
|
---|
645 | /// spezifies the split border of the axis aligned split
|
---|
646 | float mAxisAlignedSplitBorder;
|
---|
647 |
|
---|
648 | /// maximal acceptable cost ratio
|
---|
649 | float mTermMaxCostRatio;
|
---|
650 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
651 | int mTermMissTolerance;
|
---|
652 |
|
---|
653 | //-- factors guiding the split plane heuristics
|
---|
654 | float mLeastRaySplitsFactor;
|
---|
655 | float mBalancedRaysFactor;
|
---|
656 | float mPvsFactor;
|
---|
657 |
|
---|
658 | /// if area or accumulated ray lenght should be used for PVS heuristics
|
---|
659 | bool mPvsUseArea;
|
---|
660 | /// tolerance for polygon split
|
---|
661 | float mEpsilon;
|
---|
662 | /// maximal number of test rays used to evaluate candidate split plane
|
---|
663 | int mMaxTests;
|
---|
664 | /// normalizes different bsp split plane criteria
|
---|
665 | float mCostNormalizer;
|
---|
666 | /// maximal number of view cells
|
---|
667 | int mMaxViewCells;
|
---|
668 | /// minimal number of view cells
|
---|
669 | int mMergeMinViewCells;
|
---|
670 | /// maximal cost ratio for the merge
|
---|
671 | float mMergeMaxCostRatio;
|
---|
672 |
|
---|
673 | // if rays should be stored in leaves
|
---|
674 | bool mStoreRays;
|
---|
675 |
|
---|
676 | /// if only driving axis should be used for split
|
---|
677 | bool mOnlyDrivingAxis;
|
---|
678 |
|
---|
679 | ViewCellsManager *mViewCellsManager;
|
---|
680 |
|
---|
681 | vector<SortableEntry> *mSplitCandidates;
|
---|
682 |
|
---|
683 |
|
---|
684 | typedef priority_queue<BspMergeCandidate> MergeQueue;
|
---|
685 |
|
---|
686 | MergeQueue mMergeQueue;
|
---|
687 |
|
---|
688 | /// if rays should be used to collect merge candidates
|
---|
689 | bool mUseRaysForMerge;
|
---|
690 |
|
---|
691 | /// maximal allowed pvs so that view cell is valid
|
---|
692 | int mMaxPvs;
|
---|
693 |
|
---|
694 | float mMaxPvsRatio;
|
---|
695 |
|
---|
696 | /// View cell corresponding to the space outside the valid view space
|
---|
697 | BspViewCell *mOutOfBoundsCell;
|
---|
698 |
|
---|
699 | /// if invalid space should be shown
|
---|
700 | bool mShowInvalidSpace;
|
---|
701 |
|
---|
702 | int mCurrentViewCellsId;
|
---|
703 |
|
---|
704 | /// maximal tree memory
|
---|
705 | float mMaxMemory;
|
---|
706 | /// the tree is out of memory
|
---|
707 | bool mOutOfMemory;
|
---|
708 |
|
---|
709 | private:
|
---|
710 |
|
---|
711 | static const float sLeastRaySplitsTable[5];
|
---|
712 | /** Evaluates split plane classification with respect to the plane's
|
---|
713 | contribution for balanced rays.
|
---|
714 | */
|
---|
715 | static const float sBalancedRaysTable[5];
|
---|
716 |
|
---|
717 | /// Generates unique ids for PVS criterium
|
---|
718 | static void GenerateUniqueIdsForPvs();
|
---|
719 |
|
---|
720 | //-- unique ids for PVS criterium
|
---|
721 | static int sFrontId;
|
---|
722 | static int sBackId;
|
---|
723 | static int sFrontAndBackId;
|
---|
724 | };
|
---|
725 |
|
---|
726 | /**
|
---|
727 | Candidate for leaf merging based on priority.
|
---|
728 | */
|
---|
729 | class BspMergeCandidate
|
---|
730 | {
|
---|
731 | public:
|
---|
732 |
|
---|
733 | BspMergeCandidate(BspLeaf *l1, BspLeaf *l2);
|
---|
734 |
|
---|
735 | /** If this merge pair is still valid.
|
---|
736 | */
|
---|
737 | bool Valid() const;
|
---|
738 |
|
---|
739 | /** Sets this merge candidate to be valid.
|
---|
740 | */
|
---|
741 | void SetValid();
|
---|
742 |
|
---|
743 | friend bool operator<(const BspMergeCandidate &leafa, const BspMergeCandidate &leafb)
|
---|
744 | {
|
---|
745 | return leafb.GetMergeCost() < leafa.GetMergeCost();
|
---|
746 | }
|
---|
747 |
|
---|
748 | void SetLeaf1(BspLeaf *l);
|
---|
749 | void SetLeaf2(BspLeaf *l);
|
---|
750 |
|
---|
751 | BspLeaf *GetLeaf1();
|
---|
752 | BspLeaf *GetLeaf2();
|
---|
753 |
|
---|
754 | /** Merge cost of this candidate pair.
|
---|
755 | */
|
---|
756 | float GetMergeCost() const;
|
---|
757 |
|
---|
758 | /** Returns cost of leaf 1.
|
---|
759 | */
|
---|
760 | float GetLeaf1Cost() const;
|
---|
761 | /** Returns cost of leaf 2.
|
---|
762 | */
|
---|
763 | float GetLeaf2Cost() const;
|
---|
764 |
|
---|
765 | /// maximal pvs size
|
---|
766 | static int sMaxPvsSize;
|
---|
767 | /// overall cost used to normalize cost ratio
|
---|
768 | static float sOverallCost;
|
---|
769 |
|
---|
770 | protected:
|
---|
771 |
|
---|
772 | /** Cost of a view cell.
|
---|
773 | */
|
---|
774 | float GetCost(ViewCell *vc) const;
|
---|
775 | /** Evaluates the merge costs of the leaves.
|
---|
776 | */
|
---|
777 | void EvalMergeCost();
|
---|
778 |
|
---|
779 | int mLeaf1Id;
|
---|
780 | int mLeaf2Id;
|
---|
781 |
|
---|
782 | float mMergeCost;
|
---|
783 |
|
---|
784 | BspLeaf *mLeaf1;
|
---|
785 | BspLeaf *mLeaf2;
|
---|
786 | };
|
---|
787 |
|
---|
788 |
|
---|
789 | class MergeStatistics: public StatisticsBase
|
---|
790 | {
|
---|
791 | public:
|
---|
792 |
|
---|
793 | int merged;
|
---|
794 | int siblings;
|
---|
795 | int candidates;
|
---|
796 | int nodes;
|
---|
797 |
|
---|
798 | int accTreeDist;
|
---|
799 | int maxTreeDist;
|
---|
800 |
|
---|
801 | Real collectTime;
|
---|
802 | Real mergeTime;
|
---|
803 |
|
---|
804 | // Constructor
|
---|
805 | MergeStatistics()
|
---|
806 | {
|
---|
807 | Reset();
|
---|
808 | }
|
---|
809 |
|
---|
810 | double AvgTreeDist() const {return (double)accTreeDist / (double)merged;};
|
---|
811 |
|
---|
812 | void Reset()
|
---|
813 | {
|
---|
814 | nodes = 0;
|
---|
815 | merged = 0;
|
---|
816 | siblings = 0;
|
---|
817 | candidates = 0;
|
---|
818 |
|
---|
819 | accTreeDist = 0;
|
---|
820 | maxTreeDist = 0;
|
---|
821 |
|
---|
822 | collectTime = 0;
|
---|
823 | mergeTime = 0;
|
---|
824 | }
|
---|
825 |
|
---|
826 | void Print(ostream &app) const;
|
---|
827 |
|
---|
828 | friend ostream &operator<<(ostream &s, const MergeStatistics &stat)
|
---|
829 | {
|
---|
830 | stat.Print(s);
|
---|
831 | return s;
|
---|
832 | }
|
---|
833 | };
|
---|
834 |
|
---|
835 | #endif
|
---|