[1237] | 1 | #ifndef _BvHierarchy_H__
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| 2 | #define _BvHierarchy_H__
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| 3 |
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| 4 | #include <stack>
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| 5 |
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| 6 | #include "Mesh.h"
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| 7 | #include "Containers.h"
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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 "gzstream.h"
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[1239] | 12 | #include "SubdivisionCandidate.h"
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[1237] | 13 | #include "AxisAlignedBox3.h"
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[1315] | 14 | #include "IntersectableWrapper.h"
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[1667] | 15 | #include "HierarchyManager.h"
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[1237] | 16 |
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| 17 |
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| 18 | namespace GtpVisibilityPreprocessor {
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| 19 |
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| 20 |
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| 21 | class ViewCellLeaf;
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| 22 | class Plane3;
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| 23 | class AxisAlignedBox3;
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| 24 | class Ray;
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| 25 | class ViewCellsStatistics;
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| 26 | class ViewCellsManager;
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| 27 | class MergeCandidate;
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| 28 | class Beam;
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| 29 | class ViewCellsTree;
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| 30 | class Environment;
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| 31 | class BvhInterior;
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| 32 | class BvhLeaf;
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| 33 | class BvhNode;
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| 34 | class BvhIntersectable;
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| 35 | class BvhTree;
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| 36 | class VspTree;
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| 37 | class ViewCellsContainer;
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[1370] | 38 | class HierarchyManager;
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[1237] | 39 |
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[1297] | 40 |
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[1237] | 41 | /** View space partition statistics.
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| 42 | */
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| 43 | class BvhStatistics: public StatisticsBase
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| 44 | {
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| 45 | public:
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[1370] | 46 |
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| 47 | /// Constructor
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[1237] | 48 | BvhStatistics()
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| 49 | {
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| 50 | Reset();
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| 51 | }
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| 52 |
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| 53 | int Nodes() const {return nodes;}
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| 54 | int Interior() const { return nodes / 2; }
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| 55 | int Leaves() const { return (nodes / 2) + 1; }
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| 56 |
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| 57 | double AvgDepth() const
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| 58 | { return accumDepth / (double)Leaves(); }
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| 59 |
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[1370] | 60 | double AvgObjectRefs() const
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| 61 | { return objectRefs / (double)Leaves(); }
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| 62 |
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| 63 | double AvgRayRefs() const
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| 64 | { return rayRefs / (double)Leaves(); }
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| 65 |
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| 66 |
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[1237] | 67 | void Reset()
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| 68 | {
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| 69 | nodes = 0;
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| 70 | splits = 0;
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| 71 | maxDepth = 0;
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[1705] | 72 |
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[1237] | 73 | minDepth = 99999;
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| 74 | accumDepth = 0;
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| 75 | maxDepthNodes = 0;
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| 76 | minProbabilityNodes = 0;
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| 77 | maxCostNodes = 0;
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[1370] | 78 | ///////////////////
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| 79 | minObjectsNodes = 0;
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[1237] | 80 | maxObjectRefs = 0;
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[1370] | 81 | minObjectRefs = 999999999;
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[1237] | 82 | objectRefs = 0;
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[1408] | 83 | emptyNodes = 0;
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[1370] | 84 |
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| 85 | ///////////////////
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| 86 | minRaysNodes = 0;
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| 87 | maxRayRefs = 0;
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| 88 | minRayRefs = 999999999;
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| 89 | rayRefs = 0;
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| 90 | maxRayContriNodes = 0;
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[1449] | 91 | mGlobalCostMisses = 0;
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[1237] | 92 | }
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| 93 |
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[1370] | 94 |
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| 95 | public:
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| 96 |
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| 97 | // total number of nodes
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| 98 | int nodes;
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| 99 | // number of splits
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| 100 | int splits;
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| 101 | // maximal reached depth
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| 102 | int maxDepth;
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| 103 | // minimal depth
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| 104 | int minDepth;
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| 105 | // max depth nodes
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| 106 | int maxDepthNodes;
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| 107 | // accumulated depth (used to compute average)
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| 108 | int accumDepth;
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| 109 | // minimum area nodes
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| 110 | int minProbabilityNodes;
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| 111 | /// nodes termination because of max cost ratio;
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| 112 | int maxCostNodes;
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[1449] | 113 | // global cost ratio violations
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| 114 | int mGlobalCostMisses;
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[1370] | 115 |
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[1449] | 116 | //////////////////
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[1370] | 117 | // nodes with minimum objects
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| 118 | int minObjectsNodes;
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| 119 | // max number of rays per node
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| 120 | int maxObjectRefs;
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| 121 | // min number of rays per node
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| 122 | int minObjectRefs;
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| 123 | /// object references
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| 124 | int objectRefs;
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[1408] | 125 | // leaves with no objects
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| 126 | int emptyNodes;
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[1370] | 127 |
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| 128 | //////////////////////////
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| 129 | // nodes with minimum rays
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| 130 | int minRaysNodes;
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| 131 | // max number of rays per node
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| 132 | int maxRayRefs;
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| 133 | // min number of rays per node
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| 134 | int minRayRefs;
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| 135 | /// object references
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| 136 | int rayRefs;
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| 137 | /// nodes with max ray contribution
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| 138 | int maxRayContriNodes;
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| 139 |
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[1237] | 140 | void Print(ostream &app) const;
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| 141 |
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| 142 | friend ostream &operator<<(ostream &s, const BvhStatistics &stat)
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| 143 | {
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| 144 | stat.Print(s);
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| 145 | return s;
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| 146 | }
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| 147 | };
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| 148 |
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| 149 |
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| 150 | /**
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| 151 | VspNode abstract class serving for interior and leaf node implementation
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| 152 | */
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| 153 | class BvhNode
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| 154 | {
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| 155 | public:
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| 156 |
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| 157 | // types of vsp nodes
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| 158 | enum {Interior, Leaf};
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| 159 |
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[1297] | 160 | BvhNode();
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[1237] | 161 | BvhNode(const AxisAlignedBox3 &bbox);
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| 162 | BvhNode(const AxisAlignedBox3 &bbox, BvhInterior *parent);
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| 163 |
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| 164 | virtual ~BvhNode(){};
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| 165 |
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| 166 | /** Determines whether this node is a leaf or not
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| 167 | @return true if leaf
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| 168 | */
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| 169 | virtual bool IsLeaf() const = 0;
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| 170 |
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| 171 | /** Determines whether this node is a root
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| 172 | @return true if root
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| 173 | */
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| 174 | virtual bool IsRoot() const;
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| 175 |
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| 176 | /** Returns parent node.
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| 177 | */
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| 178 | BvhInterior *GetParent();
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| 179 |
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| 180 | /** Sets parent node.
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| 181 | */
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| 182 | void SetParent(BvhInterior *parent);
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| 183 |
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[1666] | 184 | /** collects all objects under this node.
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| 185 | */
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[1614] | 186 | virtual void CollectObjects(ObjectContainer &objects) = 0;
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[1666] | 187 |
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[1237] | 188 | /** The bounding box specifies the node extent.
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| 189 | */
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[1357] | 190 | inline
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[1237] | 191 | AxisAlignedBox3 GetBoundingBox() const
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| 192 | { return mBoundingBox; }
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| 193 |
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[1666] | 194 | /** Sets bouding box of this node.
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| 195 | */
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[1357] | 196 | inline
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[1237] | 197 | void SetBoundingBox(const AxisAlignedBox3 &boundingBox)
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| 198 | { mBoundingBox = boundingBox; }
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| 199 |
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[1679] | 200 | /** Cost of mergin this node.
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| 201 | */
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| 202 | float GetMergeCost() {return (float)-mTimeStamp; }
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[1237] | 203 |
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[1679] | 204 | int mTimeStamp;
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[1666] | 205 |
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[1679] | 206 | int mPvsEntriesIncr;
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| 207 | float mMemoryIncr;
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| 208 | float mRenderCostDecr;
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| 209 |
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[1291] | 210 | /////////////////////////////////////
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[1237] | 211 | //-- mailing options
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[1291] | 212 |
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| 213 | static void NewMail(const int reserve = 1) {
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| 214 | sMailId += sReservedMailboxes;
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| 215 | sReservedMailboxes = reserve;
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| 216 | }
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| 217 |
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[1237] | 218 | void Mail() { mMailbox = sMailId; }
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| 219 | bool Mailed() const { return mMailbox == sMailId; }
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| 220 |
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[1291] | 221 | void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
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| 222 | bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }
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| 223 |
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| 224 | int IncMail() { return ++ mMailbox - sMailId; }
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| 225 |
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[1237] | 226 | static int sMailId;
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| 227 | int mMailbox;
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[1291] | 228 | static int sReservedMailboxes;
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[1237] | 229 |
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| 230 | ///////////////////////////////////
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| 231 |
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| 232 | protected:
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| 233 |
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| 234 | /// the bounding box of the node
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| 235 | AxisAlignedBox3 mBoundingBox;
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| 236 | /// parent of this node
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| 237 | BvhInterior *mParent;
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| 238 | };
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| 239 |
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| 240 |
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| 241 | /** BSP interior node implementation
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| 242 | */
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| 243 | class BvhInterior: public BvhNode
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| 244 | {
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| 245 | public:
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| 246 | /** Standard contructor taking a bounding box as argument.
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| 247 | */
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| 248 | BvhInterior(const AxisAlignedBox3 &bbox);
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| 249 | BvhInterior(const AxisAlignedBox3 &bbox, BvhInterior *parent);
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| 250 |
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| 251 | ~BvhInterior();
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| 252 | /** @return false since it is an interior node
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| 253 | */
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| 254 | bool IsLeaf() const;
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[1294] | 255 |
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[1237] | 256 | BvhNode *GetBack() { return mBack; }
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| 257 | BvhNode *GetFront() { return mFront; }
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| 258 |
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| 259 | /** Replace front or back child with new child.
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| 260 | */
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| 261 | void ReplaceChildLink(BvhNode *oldChild, BvhNode *newChild);
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| 262 |
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| 263 | /** Replace front and back child.
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| 264 | */
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| 265 | void SetupChildLinks(BvhNode *front, BvhNode *back);
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| 266 |
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| 267 | friend ostream &operator<<(ostream &s, const BvhInterior &A)
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| 268 | {
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| 269 | return s << A.mBoundingBox;
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| 270 | }
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[1679] | 271 |
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| 272 | virtual void CollectObjects(ObjectContainer &objects);
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[1684] | 273 |
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[1237] | 274 | protected:
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| 275 |
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| 276 | /// back node
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| 277 | BvhNode *mBack;
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| 278 | /// front node
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| 279 | BvhNode *mFront;
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| 280 | };
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| 281 |
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| 282 |
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| 283 | /** BSP leaf node implementation.
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| 284 | */
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| 285 | class BvhLeaf: public BvhNode
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| 286 | {
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| 287 | public:
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| 288 | /** Standard contructor taking a bounding box as argument.
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| 289 | */
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| 290 | BvhLeaf(const AxisAlignedBox3 &bbox);
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| 291 | BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent);
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| 292 | BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent, const int numObjects);
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| 293 |
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| 294 | ~BvhLeaf();
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| 295 |
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| 296 | /** @return true since it is an interior node
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| 297 | */
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| 298 | bool IsLeaf() const;
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| 299 |
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[1297] | 300 | SubdivisionCandidate *GetSubdivisionCandidate()// const
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[1237] | 301 | {
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| 302 | return mSubdivisionCandidate;
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| 303 | }
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| 304 |
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[1297] | 305 | void SetSubdivisionCandidate(SubdivisionCandidate *candidate)
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| 306 | {
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| 307 | mSubdivisionCandidate = candidate;
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| 308 | }
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[1684] | 309 |
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| 310 | virtual void CollectObjects(ObjectContainer &objects);
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| 311 |
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[1707] | 312 | /** Returns level of the hierarchy that is "active" right now.
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[1706] | 313 | */
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| 314 | BvhNode *GetActiveNode()
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| 315 | {
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| 316 | return mActiveNode;
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| 317 | }
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| 318 |
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[1707] | 319 | /** Returns level of the hierarchy that is "active" right now.
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| 320 | */
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| 321 | void SetActiveNode(BvhNode *node)
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| 322 | {
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| 323 | mActiveNode = node;
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| 324 | }
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| 325 |
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[1237] | 326 | public:
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| 327 |
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| 328 | /// Rays piercing this leaf.
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| 329 | VssRayContainer mVssRays;
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| 330 | /// objects
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| 331 | ObjectContainer mObjects;
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[1259] | 332 | /// universal counter
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| 333 | int mCounter;
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[1287] | 334 |
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[1237] | 335 | protected:
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| 336 |
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| 337 | /// pointer to a split plane candidate splitting this leaf
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| 338 | SubdivisionCandidate *mSubdivisionCandidate;
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[1706] | 339 |
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[1707] | 340 | /// the active node which will be accounted for in the pvs
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[1706] | 341 | BvhNode *mActiveNode;
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[1237] | 342 | };
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| 343 |
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| 344 |
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[1707] | 345 | typedef map<BvhLeaf *, BvhIntersectable *> BvhIntersectableMap;
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[1237] | 346 |
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| 347 |
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| 348 | /** View Space Partitioning tree.
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| 349 | */
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| 350 | class BvHierarchy
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| 351 | {
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| 352 | friend class ViewCellsParseHandlers;
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| 353 | friend class HierarchyManager;
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| 354 |
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[1379] | 355 | protected:
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[1345] | 356 | struct SortableEntry;
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| 357 | typedef vector<SortableEntry> SortableEntryContainer;
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| 358 |
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[1379] | 359 | public:
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| 360 |
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[1237] | 361 | /** Additional data which is passed down the BSP tree during traversal.
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| 362 | */
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| 363 | class BvhTraversalData
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| 364 | {
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| 365 | public:
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[1294] | 366 |
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[1237] | 367 | BvhTraversalData():
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| 368 | mNode(NULL),
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| 369 | mDepth(0),
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[1287] | 370 | mProbability(0.0),
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[1237] | 371 | mMaxCostMisses(0),
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[1370] | 372 | mAxis(0),
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| 373 | mNumRays(0)
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[1357] | 374 | {
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| 375 | mSortedObjects[0] = mSortedObjects[1] = mSortedObjects[2] = NULL;
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| 376 | }
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[1237] | 377 |
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| 378 | BvhTraversalData(BvhLeaf *node,
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| 379 | const int depth,
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[1370] | 380 | const float v,
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| 381 | const int numRays):
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[1237] | 382 | mNode(node),
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| 383 | mDepth(depth),
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[1370] | 384 | //mBoundingBox(box),
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[1287] | 385 | mProbability(v),
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[1237] | 386 | mMaxCostMisses(0),
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[1370] | 387 | mAxis(0),
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| 388 | mNumRays(numRays)
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[1357] | 389 | {
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| 390 | mSortedObjects[0] = mSortedObjects[1] = mSortedObjects[2] = NULL;
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| 391 | }
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[1237] | 392 |
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[1357] | 393 | /** Deletes contents and sets them to NULL.
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| 394 | */
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[1237] | 395 | void Clear()
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| 396 | {
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[1294] | 397 | DEL_PTR(mNode);
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[1370] | 398 | DEL_PTR(mSortedObjects[0]);
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[1357] | 399 | DEL_PTR(mSortedObjects[1]);
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[1370] | 400 | DEL_PTR(mSortedObjects[2]);
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[1237] | 401 | }
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| 402 |
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[1294] | 403 | /// the current node
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| 404 | BvhLeaf *mNode;
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| 405 | /// current depth
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| 406 | int mDepth;
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| 407 | /// the probability that this node is seen
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| 408 | float mProbability;
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| 409 | /// the bounding box of the node
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[1370] | 410 | //AxisAlignedBox3 mBoundingBox;
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[1294] | 411 | /// how often this branch has missed the max-cost ratio
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| 412 | int mMaxCostMisses;
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| 413 | /// current axis
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| 414 | int mAxis;
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[1370] | 415 | /// number of rays
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| 416 | int mNumRays;
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[1357] | 417 | /// the sorted objects for the three dimensions
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| 418 | ObjectContainer *mSortedObjects[3];
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[1237] | 419 | };
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| 420 |
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[1357] | 421 |
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| 422 | /** Candidate for a object space split.
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[1237] | 423 | */
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| 424 | class BvhSubdivisionCandidate: public SubdivisionCandidate
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| 425 | {
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| 426 | public:
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| 427 |
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[1294] | 428 | BvhSubdivisionCandidate(const BvhTraversalData &tData): mParentData(tData)
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[1237] | 429 | {};
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| 430 |
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[1305] | 431 | ~BvhSubdivisionCandidate()
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| 432 | {
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| 433 | mParentData.Clear();
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| 434 | }
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[1294] | 435 |
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[1237] | 436 | int Type() const { return OBJECT_SPACE; }
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| 437 |
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[1667] | 438 | void EvalCandidate(bool computeSplitplane = true)
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[1237] | 439 | {
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[1705] | 440 | mDirty = false;
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[1667] | 441 | sBvHierarchy->EvalSubdivisionCandidate(*this, computeSplitplane);
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[1237] | 442 | }
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| 443 |
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[1633] | 444 | bool Apply(SplitQueue &splitQueue, bool terminationCriteriaMet)
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[1632] | 445 | {
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[1667] | 446 | BvhNode *n = sBvHierarchy->Subdivide(splitQueue, this, terminationCriteriaMet);
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| 447 |
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[1632] | 448 | // local or global termination criteria failed
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| 449 | return !n->IsLeaf();
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[1633] | 450 | }
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[1632] | 451 |
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[1633] | 452 | void CollectDirtyCandidates(SubdivisionCandidateContainer &dirtyList,
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| 453 | const bool onlyUnmailed)
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| 454 | {
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| 455 | sBvHierarchy->CollectDirtyCandidates(this, dirtyList, onlyUnmailed);
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| 456 | }
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| 457 |
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[1237] | 458 | bool GlobalTerminationCriteriaMet() const
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| 459 | {
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| 460 | return sBvHierarchy->GlobalTerminationCriteriaMet(mParentData);
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| 461 | }
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| 462 |
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[1667] | 463 | BvhSubdivisionCandidate(const ObjectContainer &frontObjects,
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| 464 | const ObjectContainer &backObjects,
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| 465 | const BvhTraversalData &tData):
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[1237] | 466 | mFrontObjects(frontObjects), mBackObjects(backObjects), mParentData(tData)
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| 467 | {}
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[1294] | 468 |
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[1667] | 469 | float GetPriority() const
|
---|
| 470 | {
|
---|
[1705] | 471 | return mPriority;
|
---|
[1667] | 472 | }
|
---|
| 473 |
|
---|
[1305] | 474 | /// pointer to parent tree.
|
---|
[1294] | 475 | static BvHierarchy *sBvHierarchy;
|
---|
[1680] | 476 |
|
---|
[1294] | 477 | /// parent data
|
---|
| 478 | BvhTraversalData mParentData;
|
---|
[1305] | 479 | /// the objects on the front of the potential split
|
---|
[1294] | 480 | ObjectContainer mFrontObjects;
|
---|
[1305] | 481 | /// the objects on the back of the potential split
|
---|
[1294] | 482 | ObjectContainer mBackObjects;
|
---|
[1237] | 483 | };
|
---|
| 484 |
|
---|
| 485 | /** Struct for traversing line segment.
|
---|
| 486 | */
|
---|
| 487 | struct LineTraversalData
|
---|
| 488 | {
|
---|
| 489 | BvhNode *mNode;
|
---|
| 490 | Vector3 mExitPoint;
|
---|
| 491 |
|
---|
| 492 | float mMaxT;
|
---|
| 493 |
|
---|
| 494 | LineTraversalData () {}
|
---|
| 495 | LineTraversalData (BvhNode *n, const Vector3 &p, const float maxt):
|
---|
| 496 | mNode(n), mExitPoint(p), mMaxT(maxt) {}
|
---|
| 497 | };
|
---|
| 498 |
|
---|
| 499 |
|
---|
| 500 | /** Default constructor creating an empty tree.
|
---|
| 501 | */
|
---|
| 502 | BvHierarchy();
|
---|
| 503 |
|
---|
| 504 | /** Default destructor.
|
---|
| 505 | */
|
---|
| 506 | ~BvHierarchy();
|
---|
| 507 |
|
---|
| 508 | /** Returns tree statistics.
|
---|
| 509 | */
|
---|
| 510 | const BvhStatistics &GetStatistics() const;
|
---|
| 511 |
|
---|
| 512 | /** Returns bounding box of the specified node.
|
---|
| 513 | */
|
---|
| 514 | AxisAlignedBox3 GetBoundingBox(BvhNode *node) const;
|
---|
| 515 |
|
---|
| 516 | /** Reads parameters from environment singleton.
|
---|
| 517 | */
|
---|
| 518 | void ReadEnvironment();
|
---|
| 519 |
|
---|
| 520 | /** Evaluates candidate for splitting.
|
---|
| 521 | */
|
---|
[1680] | 522 | void EvalSubdivisionCandidate(BvhSubdivisionCandidate &splitData,
|
---|
| 523 | bool computeSplitPlane = true);
|
---|
[1237] | 524 |
|
---|
[1707] | 525 | /** Returns vector of leaves.
|
---|
[1237] | 526 | */
|
---|
[1707] | 527 | void CollectLeaves(BvhNode *root, vector<BvhLeaf *> &leaves) const;
|
---|
[1237] | 528 |
|
---|
| 529 | /** Returns bounding box of the whole tree (= bbox of root node)
|
---|
| 530 | */
|
---|
| 531 | AxisAlignedBox3 GetBoundingBox()const;
|
---|
| 532 |
|
---|
| 533 | /** Returns root of the view space partitioning tree.
|
---|
| 534 | */
|
---|
| 535 | BvhNode *GetRoot() const;
|
---|
| 536 |
|
---|
| 537 | /** finds neighbouring leaves of this tree node.
|
---|
| 538 | */
|
---|
| 539 | int FindNeighbors(BvhLeaf *n,
|
---|
| 540 | vector<BvhLeaf *> &neighbors,
|
---|
| 541 | const bool onlyUnmailed) const;
|
---|
| 542 |
|
---|
| 543 | /** Returns random leaf of BSP tree.
|
---|
| 544 | @param halfspace defines the halfspace from which the leaf is taken.
|
---|
| 545 | */
|
---|
| 546 | BvhLeaf *GetRandomLeaf(const Plane3 &halfspace);
|
---|
| 547 |
|
---|
| 548 | /** Returns random leaf of BSP tree.
|
---|
| 549 | @param onlyUnmailed if only unmailed leaves should be returned.
|
---|
| 550 | */
|
---|
| 551 | BvhLeaf *GetRandomLeaf(const bool onlyUnmailed = false);
|
---|
| 552 |
|
---|
| 553 | /** Casts line segment into the tree.
|
---|
| 554 | @param origin the origin of the line segment
|
---|
| 555 | @param termination the end point of the line segment
|
---|
| 556 | @returns view cells intersecting the line segment.
|
---|
| 557 | */
|
---|
| 558 | int CastLineSegment(const Vector3 &origin,
|
---|
| 559 | const Vector3 &termination,
|
---|
| 560 | ViewCellContainer &viewcells);
|
---|
| 561 |
|
---|
| 562 | /** Sets pointer to view cells manager.
|
---|
| 563 | */
|
---|
| 564 | void SetViewCellsManager(ViewCellsManager *vcm);
|
---|
| 565 |
|
---|
| 566 | /** Writes tree to output stream
|
---|
| 567 | */
|
---|
| 568 | bool Export(OUT_STREAM &stream);
|
---|
| 569 |
|
---|
[1707] | 570 | /** Returns or creates a new intersectable for use in a bv based pvs.
|
---|
| 571 | The hierarchy is responsible for destruction of the intersectable.
|
---|
[1237] | 572 | */
|
---|
[1707] | 573 | BvhIntersectable *GetOrCreateBvhIntersectable(BvhLeaf *node);
|
---|
[1237] | 574 |
|
---|
[1640] | 575 | /** Collects rays associated with the objects.
|
---|
[1237] | 576 | */
|
---|
| 577 | void CollectRays(const ObjectContainer &objects, VssRayContainer &rays) const;
|
---|
| 578 |
|
---|
| 579 | /** Intersects box with the tree and returns the number of intersected boxes.
|
---|
| 580 | @returns number of view cells found
|
---|
| 581 | */
|
---|
[1640] | 582 | int ComputeBoxIntersections(const AxisAlignedBox3 &box,
|
---|
| 583 | ViewCellContainer &viewCells) const;
|
---|
[1237] | 584 |
|
---|
| 585 | /** Returns leaf the point pt lies in, starting from root.
|
---|
| 586 | */
|
---|
| 587 | BvhLeaf *GetLeaf(Intersectable *obj, BvhNode *root = NULL) const;
|
---|
| 588 |
|
---|
[1370] | 589 | /** Sets a pointer to the view cells tree.
|
---|
| 590 | */
|
---|
[1237] | 591 | ViewCellsTree *GetViewCellsTree() const { return mViewCellsTree; }
|
---|
[1707] | 592 |
|
---|
[1370] | 593 | /** See Get
|
---|
| 594 | */
|
---|
[1237] | 595 | void SetViewCellsTree(ViewCellsTree *vt) { mViewCellsTree = vt; }
|
---|
| 596 |
|
---|
[1640] | 597 | /** Returns estimated memory usage of tree.
|
---|
| 598 | */
|
---|
| 599 | float GetMemUsage() const;
|
---|
[1237] | 600 |
|
---|
[1707] | 601 | /** Sets this node to be an active node.
|
---|
| 602 | */
|
---|
| 603 | void SetActive(BvhNode *node) const;
|
---|
[1680] | 604 |
|
---|
[1707] | 605 |
|
---|
[1684] | 606 | ///////////////////////////
|
---|
| 607 | // hacks in order to provide interleaved heurisitcs
|
---|
| 608 |
|
---|
[1686] | 609 | BvhNode *SubdivideAndCopy(SplitQueue &tQueue, SubdivisionCandidate *splitCandidate);
|
---|
[1684] | 610 |
|
---|
| 611 | /////////////////////////////////
|
---|
| 612 |
|
---|
[1703] | 613 | static float EvalAbsCost(const ObjectContainer &objects);
|
---|
[1698] | 614 |
|
---|
[1707] | 615 |
|
---|
[1237] | 616 | protected:
|
---|
| 617 |
|
---|
| 618 | /** Returns true if tree can be terminated.
|
---|
| 619 | */
|
---|
[1251] | 620 | bool LocalTerminationCriteriaMet(const BvhTraversalData &data) const;
|
---|
[1237] | 621 |
|
---|
| 622 | /** Returns true if global tree can be terminated.
|
---|
| 623 | */
|
---|
[1251] | 624 | bool GlobalTerminationCriteriaMet(const BvhTraversalData &data) const;
|
---|
[1237] | 625 |
|
---|
[1287] | 626 | /** For sorting the objects during the heuristics
|
---|
| 627 | */
|
---|
[1237] | 628 | struct SortableEntry
|
---|
| 629 | {
|
---|
[1287] | 630 | Intersectable *mObject;
|
---|
[1237] | 631 | float mPos;
|
---|
| 632 |
|
---|
| 633 | SortableEntry() {}
|
---|
| 634 |
|
---|
[1287] | 635 | SortableEntry(Intersectable *obj, const float pos):
|
---|
| 636 | mObject(obj), mPos(pos)
|
---|
[1237] | 637 | {}
|
---|
| 638 |
|
---|
| 639 | bool operator<(const SortableEntry &b) const
|
---|
| 640 | {
|
---|
| 641 | return mPos < b.mPos;
|
---|
| 642 | }
|
---|
| 643 | };
|
---|
[1345] | 644 |
|
---|
[1287] | 645 | /** Evaluate balanced object partition.
|
---|
[1237] | 646 | */
|
---|
[1640] | 647 | float EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
| 648 | const int axis,
|
---|
| 649 | ObjectContainer &objectsFront,
|
---|
| 650 | ObjectContainer &objectsBack);
|
---|
[1237] | 651 |
|
---|
[1640] | 652 | /** Evaluate surface area heuristic for the node.
|
---|
| 653 | */
|
---|
| 654 | float EvalSah(const BvhTraversalData &tData,
|
---|
| 655 | const int axis,
|
---|
| 656 | ObjectContainer &objectsFront,
|
---|
| 657 | ObjectContainer &objectsBack);
|
---|
[1323] | 658 |
|
---|
[1237] | 659 | /** Computes priority of the traversal data and stores it in tData.
|
---|
| 660 | */
|
---|
| 661 | void EvalPriority(BvhTraversalData &tData) const;
|
---|
| 662 |
|
---|
[1379] | 663 | /** Evaluates render cost of the bv induced by these objects
|
---|
[1237] | 664 | */
|
---|
[1379] | 665 | float EvalRenderCost(const ObjectContainer &objects) const;
|
---|
[1237] | 666 |
|
---|
| 667 | /** Evaluates tree stats in the BSP tree leafs.
|
---|
| 668 | */
|
---|
| 669 | void EvaluateLeafStats(const BvhTraversalData &data);
|
---|
| 670 |
|
---|
| 671 | /** Subdivides node using a best split priority queue.
|
---|
| 672 | @param tQueue the best split priority queue
|
---|
| 673 | @param splitCandidate the candidate for the next split
|
---|
| 674 | @param globalCriteriaMet if the global termination criteria were already met
|
---|
| 675 | @returns new root of the subtree
|
---|
| 676 | */
|
---|
[1640] | 677 | BvhNode *Subdivide(SplitQueue &tQueue,
|
---|
| 678 | SubdivisionCandidate *splitCandidate,
|
---|
| 679 | const bool globalCriteriaMet);
|
---|
[1237] | 680 |
|
---|
| 681 | /** Subdivides leaf.
|
---|
[1345] | 682 | @param sc the subdivisionCandidate holding all necessary data for subdivision
|
---|
[1237] | 683 |
|
---|
[1345] | 684 | @param frontData returns the traversal data for the front node
|
---|
| 685 | @param backData returns the traversal data for the back node
|
---|
[1237] | 686 |
|
---|
[1345] | 687 | @returns the new interior node = the of the subdivision
|
---|
[1237] | 688 | */
|
---|
[1640] | 689 | BvhInterior *SubdivideNode(const BvhSubdivisionCandidate &sc,
|
---|
| 690 | BvhTraversalData &frontData,
|
---|
| 691 | BvhTraversalData &backData);
|
---|
[1237] | 692 |
|
---|
| 693 | /** Splits the objects for the next subdivision.
|
---|
| 694 | @returns cost for this split
|
---|
| 695 | */
|
---|
[1640] | 696 | float SelectObjectPartition(const BvhTraversalData &tData,
|
---|
| 697 | ObjectContainer &frontObjects,
|
---|
[1676] | 698 | ObjectContainer &backObjects,
|
---|
| 699 | bool useVisibilityBasedHeuristics);
|
---|
[1237] | 700 |
|
---|
| 701 | /** Writes the node to disk
|
---|
| 702 | @note: should be implemented as visitor.
|
---|
| 703 | */
|
---|
| 704 | void ExportNode(BvhNode *node, OUT_STREAM &stream);
|
---|
| 705 |
|
---|
[1640] | 706 | /** Exports objects associated with this leaf.
|
---|
| 707 | */
|
---|
[1286] | 708 | void ExportObjects(BvhLeaf *leaf, OUT_STREAM &stream);
|
---|
| 709 |
|
---|
[1548] | 710 | /** Associates the objects with their bvh leaves.
|
---|
[1294] | 711 | */
|
---|
[1486] | 712 | static void AssociateObjectsWithLeaf(BvhLeaf *leaf);
|
---|
| 713 |
|
---|
| 714 |
|
---|
[1237] | 715 | /////////////////////////////
|
---|
| 716 | // Helper functions for local cost heuristics
|
---|
| 717 |
|
---|
[1357] | 718 | /** Prepare split candidates for cost heuristics using axis aligned splits.
|
---|
[1237] | 719 | @param node the current node
|
---|
| 720 | @param axis the current split axis
|
---|
| 721 | */
|
---|
[1640] | 722 | void PrepareLocalSubdivisionCandidates(const BvhTraversalData &tData,
|
---|
| 723 | const int axis);
|
---|
[1237] | 724 |
|
---|
[1640] | 725 | static void CreateLocalSubdivisionCandidates(const ObjectContainer &objects,
|
---|
| 726 | SortableEntryContainer **subdivisionCandidates,
|
---|
| 727 | const bool sort,
|
---|
| 728 | const int axis);
|
---|
[1357] | 729 |
|
---|
| 730 | /** Computes object partition with the best cost according to the heurisics.
|
---|
| 731 | @param tData the traversal data
|
---|
| 732 | @param axis the split axis
|
---|
| 733 | @param objectsFront the objects in the front child bv
|
---|
| 734 | @param objectsBack the objects in the back child bv
|
---|
| 735 | @param backObjectsStart the iterator marking the position where the back objects begin
|
---|
| 736 |
|
---|
| 737 | @returns relative cost (relative to parent cost)
|
---|
[1237] | 738 | */
|
---|
[1640] | 739 | float EvalLocalCostHeuristics(const BvhTraversalData &tData,
|
---|
| 740 | const int axis,
|
---|
| 741 | ObjectContainer &objectsFront,
|
---|
| 742 | ObjectContainer &objectsBack);
|
---|
[1237] | 743 |
|
---|
[1287] | 744 | /** Evaluates the contribution to the front and back volume
|
---|
| 745 | when this object is changing sides in the bvs.
|
---|
[1237] | 746 |
|
---|
[1287] | 747 | @param object the object
|
---|
| 748 | @param volLeft updates the left pvs
|
---|
| 749 | @param volPvs updates the right pvs
|
---|
[1237] | 750 | */
|
---|
[1640] | 751 | void EvalHeuristicsContribution(Intersectable *obj,
|
---|
| 752 | float &volLeft,
|
---|
| 753 | float &volRight);
|
---|
[1237] | 754 |
|
---|
| 755 | /** Prepares objects for the cost heuristics.
|
---|
| 756 | @returns sum of volume of associated view cells
|
---|
| 757 | */
|
---|
[1287] | 758 | float PrepareHeuristics(const BvhTraversalData &tData, const int axis);
|
---|
[1237] | 759 |
|
---|
[1705] | 760 | /** Evaluates cost for a leaf given the surface area heuristics.
|
---|
| 761 | */
|
---|
| 762 | float EvalSahCost(BvhLeaf *leaf);
|
---|
[1633] | 763 |
|
---|
[1237] | 764 | ////////////////////////////////////////////////
|
---|
| 765 |
|
---|
| 766 |
|
---|
| 767 | /** Prepares construction for vsp and osp trees.
|
---|
| 768 | */
|
---|
[1640] | 769 | AxisAlignedBox3 EvalBoundingBox(const ObjectContainer &objects,
|
---|
| 770 | const AxisAlignedBox3 *parentBox = NULL) const;
|
---|
[1237] | 771 |
|
---|
[1370] | 772 | /** Collects list of invalid candidates. Candidates
|
---|
| 773 | are invalidated by a view space subdivision step
|
---|
| 774 | that affects this candidate.
|
---|
| 775 | */
|
---|
[1640] | 776 | void CollectDirtyCandidates(BvhSubdivisionCandidate *sc,
|
---|
| 777 | vector<SubdivisionCandidate *> &dirtyList,
|
---|
| 778 | const bool onlyUnmailed);
|
---|
[1237] | 779 |
|
---|
[1287] | 780 | /** Collect view cells which see this bvh leaf.
|
---|
[1237] | 781 | */
|
---|
[1640] | 782 | void CollectViewCells(const ObjectContainer &objects,
|
---|
| 783 | ViewCellContainer &viewCells,
|
---|
| 784 | const bool setCounter = false) const;
|
---|
[1237] | 785 |
|
---|
[1576] | 786 | /** Counts the view cells of this object. note: only
|
---|
| 787 | counts unmailed objects.
|
---|
| 788 | */
|
---|
| 789 | int CountViewCells(Intersectable *obj) const;
|
---|
| 790 |
|
---|
| 791 | /** Counts the view cells seen by this bvh leaf
|
---|
| 792 | */
|
---|
| 793 | int CountViewCells(const ObjectContainer &objects) const;
|
---|
| 794 |
|
---|
[1287] | 795 | /** Collects view cells which see an object.
|
---|
| 796 | */
|
---|
[1640] | 797 | void CollectViewCells(Intersectable *object,
|
---|
| 798 | ViewCellContainer &viewCells,
|
---|
| 799 | const bool useMailBoxing,
|
---|
| 800 | const bool setCounter = false) const;
|
---|
[1287] | 801 |
|
---|
[1576] | 802 | /** Evaluates increase in pvs size.
|
---|
| 803 | */
|
---|
| 804 | int EvalPvsEntriesIncr(BvhSubdivisionCandidate &splitCandidate) const;
|
---|
| 805 |
|
---|
[1237] | 806 | /** Rays will be clipped to the bounding box.
|
---|
| 807 | */
|
---|
[1640] | 808 | void PreprocessRays(BvhLeaf *root,
|
---|
| 809 | const VssRayContainer &sampleRays,
|
---|
| 810 | RayInfoContainer &rays);
|
---|
[1237] | 811 |
|
---|
[1287] | 812 | /** Print the subdivision stats in the subdivison log.
|
---|
| 813 | */
|
---|
| 814 | void PrintSubdivisionStats(const SubdivisionCandidate &tData);
|
---|
[1237] | 815 |
|
---|
[1370] | 816 | /** Prints out the stats for this subdivision.
|
---|
| 817 | */
|
---|
[1640] | 818 | void AddSubdivisionStats(const int viewCells,
|
---|
| 819 | const float renderCostDecr,
|
---|
| 820 | const float totalRenderCost);
|
---|
[1237] | 821 |
|
---|
[1370] | 822 | /** Stores rays with objects that see the rays.
|
---|
| 823 | */
|
---|
| 824 | int AssociateObjectsWithRays(const VssRayContainer &rays) const;
|
---|
[1237] | 825 |
|
---|
[1370] | 826 | /** Tests if object is in this leaf.
|
---|
| 827 | @note: assumes that objects are sorted by their id.
|
---|
| 828 | */
|
---|
[1237] | 829 | bool IsObjectInLeaf(BvhLeaf *, Intersectable *object) const;
|
---|
| 830 |
|
---|
[1370] | 831 | /** Prepares the construction of the bv hierarchy and returns
|
---|
| 832 | the first subdivision candidate.
|
---|
| 833 | */
|
---|
[1640] | 834 | SubdivisionCandidate *PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
| 835 | const ObjectContainer &objects);
|
---|
[1237] | 836 |
|
---|
[1548] | 837 | /** Resets bv hierarchy. E.g. deletes root and resets stats.
|
---|
| 838 | */
|
---|
[1640] | 839 | SubdivisionCandidate *Reset(const VssRayContainer &rays,
|
---|
| 840 | const ObjectContainer &objects);
|
---|
[1548] | 841 |
|
---|
[1370] | 842 | /** Evaluates volume of view cells that see the objects.
|
---|
| 843 | */
|
---|
[1287] | 844 | float EvalViewCellsVolume(const ObjectContainer &objects) const;
|
---|
[1237] | 845 |
|
---|
[1580] | 846 | /** Assigns or newly creates initial list of sorted objects.
|
---|
[1370] | 847 | */
|
---|
[1580] | 848 | void AssignInitialSortedObjectList(BvhTraversalData &tData);
|
---|
[1259] | 849 |
|
---|
[1370] | 850 | /** Assigns sorted objects to front and back data.
|
---|
| 851 | */
|
---|
[1640] | 852 | void AssignSortedObjects(const BvhSubdivisionCandidate &sc,
|
---|
| 853 | BvhTraversalData &frontData,
|
---|
| 854 | BvhTraversalData &backData);
|
---|
[1548] | 855 |
|
---|
[1640] | 856 | /** Creates new root of hierarchy and computes bounding box.
|
---|
| 857 | Has to be called before the preparation of the subdivision.
|
---|
[1548] | 858 | */
|
---|
[1640] | 859 | void Initialise(const ObjectContainer &objects);
|
---|
| 860 |
|
---|
| 861 |
|
---|
[1237] | 862 | protected:
|
---|
| 863 |
|
---|
[1345] | 864 | /// pre-sorted subdivision candidtes for all three directions.
|
---|
| 865 | vector<SortableEntry> *mGlobalSubdivisionCandidates[3];
|
---|
[1237] | 866 | /// pointer to the hierarchy of view cells
|
---|
| 867 | ViewCellsTree *mViewCellsTree;
|
---|
| 868 | /// The view cells manager
|
---|
| 869 | ViewCellsManager *mViewCellsManager;
|
---|
| 870 | /// candidates for placing split planes during cost heuristics
|
---|
| 871 | vector<SortableEntry> *mSubdivisionCandidates;
|
---|
| 872 | /// Pointer to the root of the tree
|
---|
| 873 | BvhNode *mRoot;
|
---|
| 874 | /// Statistics for the object space partition
|
---|
[1370] | 875 | BvhStatistics mBvhStats;
|
---|
[1237] | 876 | /// box around the whole view domain
|
---|
| 877 | AxisAlignedBox3 mBoundingBox;
|
---|
[1370] | 878 | /// the hierarchy manager
|
---|
| 879 | HierarchyManager *mHierarchyManager;
|
---|
[1237] | 880 |
|
---|
| 881 |
|
---|
[1449] | 882 | ////////////////////
|
---|
[1357] | 883 | //-- local termination criteria
|
---|
[1237] | 884 |
|
---|
| 885 | /// maximal possible depth
|
---|
| 886 | int mTermMaxDepth;
|
---|
| 887 | /// mininum probability
|
---|
[1287] | 888 | float mTermMinProbability;
|
---|
[1237] | 889 | /// minimal number of objects
|
---|
| 890 | int mTermMinObjects;
|
---|
| 891 | /// maximal acceptable cost ratio
|
---|
| 892 | float mTermMaxCostRatio;
|
---|
| 893 | /// tolerance value indicating how often the max cost ratio can be failed
|
---|
| 894 | int mTermMissTolerance;
|
---|
[1370] | 895 | /// minimum number of rays
|
---|
| 896 | int mTermMinRays;
|
---|
[1237] | 897 |
|
---|
| 898 |
|
---|
[1449] | 899 | ////////////////////
|
---|
[1357] | 900 | //-- global termination criteria
|
---|
[1237] | 901 |
|
---|
[1580] | 902 | /// the minimal accepted global cost ratio
|
---|
[1237] | 903 | float mTermMinGlobalCostRatio;
|
---|
[1580] | 904 | //// number of accepted misses of the global cost ratio
|
---|
[1237] | 905 | int mTermGlobalCostMissTolerance;
|
---|
| 906 | /// maximal number of view cells
|
---|
| 907 | int mTermMaxLeaves;
|
---|
| 908 | /// maximal tree memory
|
---|
| 909 | float mMaxMemory;
|
---|
| 910 | /// the tree is out of memory
|
---|
| 911 | bool mOutOfMemory;
|
---|
| 912 |
|
---|
| 913 |
|
---|
[1357] | 914 | ////////////////////////////////////////
|
---|
[1237] | 915 | //-- split heuristics based parameters
|
---|
| 916 |
|
---|
[1643] | 917 | /// if a heuristics should be used for finding a split plane
|
---|
| 918 | bool mUseCostHeuristics;
|
---|
| 919 | /// if sah heuristcs should be used for finding a split plane
|
---|
| 920 | bool mUseSah;
|
---|
| 921 | /// balancing factor for PVS criterium
|
---|
[1237] | 922 | float mCtDivCi;
|
---|
| 923 | /// if only driving axis should be used for split
|
---|
| 924 | bool mOnlyDrivingAxis;
|
---|
| 925 | /// current time stamp (used for keeping split history)
|
---|
| 926 | int mTimeStamp;
|
---|
| 927 | // if rays should be stored in leaves
|
---|
| 928 | bool mStoreRays;
|
---|
[1357] | 929 | // subdivision stats output file
|
---|
[1237] | 930 | ofstream mSubdivisionStats;
|
---|
| 931 | /// keeps track of cost during subdivision
|
---|
| 932 | float mTotalCost;
|
---|
[1662] | 933 | int mPvsEntries;
|
---|
[1237] | 934 | /// keeps track of overall pvs size during subdivision
|
---|
| 935 | int mTotalPvsSize;
|
---|
| 936 | /// number of currenly generated view cells
|
---|
| 937 | int mCreatedLeaves;
|
---|
| 938 | /// represents min and max band for sweep
|
---|
| 939 | float mSplitBorder;
|
---|
| 940 | /// weight between render cost decrease and node render cost
|
---|
| 941 | float mRenderCostDecreaseWeight;
|
---|
| 942 | /// stores the kd node intersectables used for pvs
|
---|
| 943 | BvhIntersectableMap mBvhIntersectables;
|
---|
[1580] | 944 | /// if the objects should be sorted in one global step
|
---|
| 945 | bool mUseGlobalSorting;
|
---|
[1237] | 946 |
|
---|
[1662] | 947 | bool mUseBboxAreaForSah;
|
---|
| 948 |
|
---|
[1580] | 949 | SortableEntryContainer *mSortedObjects[3];
|
---|
[1676] | 950 |
|
---|
| 951 | int mMinRaysForVisibility;
|
---|
[1237] | 952 | };
|
---|
| 953 |
|
---|
| 954 | }
|
---|
| 955 |
|
---|
| 956 | #endif
|
---|