[1237] | 1 | #ifndef _HierarchyManager_H__
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| 2 | #define _HierarchyManager_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 |
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| 14 |
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| 15 |
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| 16 | namespace GtpVisibilityPreprocessor {
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| 17 |
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| 18 | class ViewCellLeaf;
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| 19 | class OspTree;
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| 20 | class VspTree;
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| 21 | class Plane3;
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| 22 | class AxisAlignedBox3;
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| 23 | class Ray;
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| 24 | class ViewCellsStatistics;
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| 25 | class ViewCellsManager;
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| 26 | class MergeCandidate;
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| 27 | class Beam;
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| 28 | class ViewCellsTree;
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| 29 | class Environment;
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| 30 | class VspInterior;
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| 31 | class VspLeaf;
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| 32 | class VspNode;
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| 33 | class KdNode;
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| 34 | class KdInterior;
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| 35 | class KdLeaf;
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| 36 | class OspTree;
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| 37 | class KdIntersectable;
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| 38 | class KdTree;
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| 39 | class VspTree;
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| 40 | class KdTreeStatistics;
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[1259] | 41 | class BvHierarchy;
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[1287] | 42 | class Exporter;
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[1667] | 43 | class ViewCellsParseHandlers;
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[1237] | 44 |
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[1667] | 45 |
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[1649] | 46 | #define COUNT_ORIGIN_OBJECTS 1
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[1237] | 47 |
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[1551] | 48 | /** View space / object space hierarchy statistics.
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[1288] | 49 | */
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| 50 | class HierarchyStatistics: public StatisticsBase
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| 51 | {
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| 52 | public:
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[1576] | 53 | /// total number of entries in the pvs
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[1624] | 54 | int mPvsEntries;
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[1640] | 55 | /// storage cost in MB
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| 56 | float mMemory;
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[1288] | 57 | /// total number of nodes
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[1624] | 58 | int mNodes;
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[1288] | 59 | /// maximal reached depth
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[1624] | 60 | int mMaxDepth;
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[1288] | 61 | /// accumulated depth
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[1624] | 62 | int mAccumDepth;
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[1449] | 63 | /// time spent for queue repair
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[1624] | 64 | float mRepairTime;
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| 65 |
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[1449] | 66 | // global cost ratio violations
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| 67 | int mGlobalCostMisses;
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[1624] | 68 | /// total cost of subdivision
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| 69 | float mTotalCost;
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| 70 | /// render cost decrease of subdivision
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| 71 | float mRenderCostDecrease;
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[1313] | 72 |
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[1288] | 73 | // Constructor
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| 74 | HierarchyStatistics()
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| 75 | {
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| 76 | Reset();
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| 77 | }
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| 78 |
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[1624] | 79 | int Nodes() const {return mNodes;}
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[1640] | 80 | int Interior() const { return mNodes / 2 - 1; }
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[1624] | 81 | int Leaves() const { return (mNodes / 2) + 1; }
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[1288] | 82 |
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| 83 | // TODO: computation wrong
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[1624] | 84 | double AvgDepth() const { return mAccumDepth / (double)Leaves();}
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[1288] | 85 |
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[1449] | 86 | void Reset()
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[1288] | 87 | {
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[1449] | 88 | mGlobalCostMisses = 0;
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[1624] | 89 | mTotalCost = 0;
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| 90 | mRenderCostDecrease = 0;
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| 91 |
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| 92 | mNodes = 0;
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| 93 | mMaxDepth = 0;
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| 94 | mAccumDepth = 0;
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| 95 | mRepairTime = 0;
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| 96 | mMemory = 0;
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| 97 | mPvsEntries = 0;
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[1288] | 98 | }
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| 99 |
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| 100 | void Print(ostream &app) const;
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| 101 |
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| 102 | friend ostream &operator<<(ostream &s, const HierarchyStatistics &stat)
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| 103 | {
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| 104 | stat.Print(s);
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| 105 | return s;
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| 106 | }
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| 107 | };
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| 108 |
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| 109 |
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[1237] | 110 | /** This class implements a structure holding two different hierarchies,
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| 111 | one for object space partitioning and one for view space partitioning.
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| 112 |
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| 113 | The object space and the view space are subdivided using a cost heuristics.
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| 114 | If an object space split or a view space split is chosen is also evaluated
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| 115 | based on the heuristics.
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| 116 |
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| 117 | The view space heuristics is evaluated by weighting and adding the pvss of the back and
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| 118 | front node of each specific split. unlike for the standalone method vspbsp tree,
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| 119 | the pvs of an object would not be the pvs of single object but that of all objects
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| 120 | which are contained in the same leaf of the object subdivision. This could be done
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| 121 | by storing the pointer to the object space partition parent, which would allow access to all children.
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| 122 | Another possibility is to include traced kd-cells in the ray casing process.
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| 123 |
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| 124 | Accordingly, the object space heuristics is evaluated by storing a pvs of view cells with each object.
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| 125 | the contribution to an object to the pvs is the number of view cells it can be seen from.
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| 126 |
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| 127 | @note
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| 128 | There is a potential efficiency problem involved in a sense that once a certain type
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| 129 | of split is chosen for view space / object space, the candidates for the next split of
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| 130 | object space / view space must be reevaluated.
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| 131 | */
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| 132 | class HierarchyManager
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| 133 | {
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| 134 | public:
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[1421] | 135 | /** Constructor with the view space partition tree and
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| 136 | the object space hierarchy type as argument.
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[1237] | 137 | */
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[1421] | 138 | HierarchyManager(const int objectSpaceHierarchyType);
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[1279] | 139 | /** Hack: OspTree will copy the content from this kd tree.
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| 140 | Only view space hierarchy will be constructed.
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| 141 | */
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[1421] | 142 | HierarchyManager(KdTree *kdTree);
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[1237] | 143 |
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[1421] | 144 | /** Deletes space partition and view space partition.
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| 145 | */
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[1286] | 146 | ~HierarchyManager();
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| 147 |
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[1237] | 148 | /** Constructs the view space and object space subdivision from a given set of rays
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| 149 | and a set of objects.
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| 150 | @param sampleRays the set of sample rays the construction is based on
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| 151 | @param objects the set of objects
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| 152 | */
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[1308] | 153 | void Construct(
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[1293] | 154 | const VssRayContainer &sampleRays,
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| 155 | const ObjectContainer &objects,
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| 156 | AxisAlignedBox3 *forcedViewSpace);
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[1237] | 157 |
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[1259] | 158 | enum
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| 159 | {
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| 160 | NO_OBJ_SUBDIV,
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| 161 | KD_BASED_OBJ_SUBDIV,
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| 162 | BV_BASED_OBJ_SUBDIV
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| 163 | };
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[1237] | 164 |
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[1370] | 165 | enum
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| 166 | {
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| 167 | NO_VIEWSPACE_SUBDIV,
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| 168 | KD_BASED_VIEWSPACE_SUBDIV
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| 169 | };
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| 170 |
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[1259] | 171 | /** The type of object space subdivison
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| 172 | */
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[1370] | 173 | int GetObjectSpaceSubdivisionType() const;
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| 174 | /** The type of view space space subdivison
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| 175 | */
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| 176 | int GetViewSpaceSubdivisionType() const;
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| 177 | /** Sets a pointer to the view cells manager.
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| 178 | */
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[1279] | 179 | void SetViewCellsManager(ViewCellsManager *vcm);
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[1370] | 180 | /** Sets a pointer to the view cells tree.
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| 181 | */
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[1279] | 182 | void SetViewCellsTree(ViewCellsTree *vcTree);
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[1370] | 183 | /** Exports the object hierarchy to disc.
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| 184 | */
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[1279] | 185 | void ExportObjectSpaceHierarchy(OUT_STREAM &stream);
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[1370] | 186 | /** Adds a sample to the pvs of the specified view cell.
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| 187 | */
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[1279] | 188 | bool AddSampleToPvs(
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| 189 | Intersectable *obj,
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| 190 | const Vector3 &hitPoint,
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| 191 | ViewCell *vc,
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| 192 | const float pdf,
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| 193 | float &contribution) const;
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| 194 |
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[1421] | 195 | /** Print out statistics.
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| 196 | */
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| 197 | void PrintHierarchyStatistics(ostream &stream) const;
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[1279] | 198 |
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[1421] | 199 | /** Returns the view space partition tree.
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| 200 | */
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[1379] | 201 | VspTree *GetVspTree();
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[1279] | 202 |
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[1421] | 203 | /** Returns view space bounding box.
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| 204 | */
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[1563] | 205 | //AxisAlignedBox3 GetViewSpaceBox() const;
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[1624] | 206 |
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[1421] | 207 | /** Returns object space bounding box.
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| 208 | */
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[1416] | 209 | AxisAlignedBox3 GetObjectSpaceBox() const;
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[1379] | 210 |
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[1421] | 211 | /** Exports object space hierarchy for visualization.
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| 212 | */
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[1626] | 213 | void ExportObjectSpaceHierarchy(Exporter *exporter,
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| 214 | const ObjectContainer &objects,
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| 215 | const AxisAlignedBox3 *bbox,
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| 216 | const bool exportBounds = true) const;
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[1279] | 217 |
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[1421] | 218 | /** Returns intersectable pierced by this ray.
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| 219 | */
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[1626] | 220 | Intersectable *GetIntersectable(const VssRay &ray, const bool isTermination) const;
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[1418] | 221 |
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[1626] | 222 | /** Export object space partition bounding boxes.
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| 223 | */
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| 224 | void ExportBoundingBoxes(OUT_STREAM &stream, const ObjectContainer &objects);
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| 225 |
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[1419] | 226 | friend ostream &operator<<(ostream &s, const HierarchyManager &hm)
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| 227 | {
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[1421] | 228 | hm.PrintHierarchyStatistics(s);
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[1419] | 229 | return s;
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| 230 | }
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| 231 |
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[1667] | 232 | HierarchyStatistics &GetHierarchyStats() { return mHierarchyStats; };
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| 233 |
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| 234 | inline bool ConsiderMemory() const { return mConsiderMemory; }
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| 235 |
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[1237] | 236 | protected:
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| 237 |
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[1625] | 238 | /** Returns true if the global termination criteria were met.
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| 239 | */
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[1237] | 240 | bool GlobalTerminationCriteriaMet(SubdivisionCandidate *candidate) const;
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| 241 |
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| 242 | /** Prepare construction of the hierarchies, set parameters, compute
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| 243 | first split candidates.
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| 244 | */
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[1625] | 245 | SubdivisionCandidate *PrepareObjectSpaceSubdivision(const VssRayContainer &sampleRays,
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| 246 | const ObjectContainer &objects);
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[1237] | 247 |
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[1625] | 248 |
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[1640] | 249 | /** Create bounding box and root.
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| 250 | */
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| 251 | void InitialiseObjectSpaceSubdivision(const ObjectContainer &objects);
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| 252 |
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| 253 | /** Returns memory usage of object space hierarchy.
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| 254 | */
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| 255 | float GetObjectSpaceMemUsage() const;
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| 256 |
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[1667] | 257 |
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[1625] | 258 | //////////////////////////////
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| 259 | // the main loop
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| 260 |
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| 261 | /** This is for interleaved construction / sequential construction.
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| 262 | */
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| 263 | void RunConstruction(const bool repairQueue,
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| 264 | const VssRayContainer &sampleRays,
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| 265 | const ObjectContainer &objects,
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[1640] | 266 | AxisAlignedBox3 *forcedViewSpace);
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[1449] | 267 |
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[1625] | 268 | /** This is for interleaved construction using some objects
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| 269 | and some view space splits.
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| 270 | */
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| 271 | int RunConstruction(SplitQueue &splitQueue,
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| 272 | SubdivisionCandidateContainer &chosenCandidates,
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[1667] | 273 | //const float minRenderCostDecr,
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| 274 | SubdivisionCandidate *oldCandidate,
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[1634] | 275 | const int minSteps);
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[1625] | 276 |
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| 277 | /** Default subdivision method.
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| 278 | */
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[1449] | 279 | void RunConstruction(const bool repairQueue);
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| 280 |
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[1625] | 281 | ////////////////////////////////////////////////
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| 282 |
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[1580] | 283 | /** Evaluates the subdivision candidate and executes the split.
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| 284 | */
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[1625] | 285 | bool ApplySubdivisionCandidate(SubdivisionCandidate *sc,
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| 286 | SplitQueue &splitQueue,
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| 287 | const bool repairQueue);
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[1237] | 288 |
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[1625] | 289 | /** Tests if hierarchy construction is finished.
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| 290 | */
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[1237] | 291 | bool FinishedConstruction() const;
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| 292 |
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[1625] | 293 | /** Returns next subdivision candidate from the split queue.
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| 294 | */
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| 295 | SubdivisionCandidate *NextSubdivisionCandidate(SplitQueue &splitQueue);
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[1237] | 296 |
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[1625] | 297 | /** Repairs the dirty entries of the subdivision candidate queue. The
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| 298 | list of entries is given in the dirty list.
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[1580] | 299 | */
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[1633] | 300 | void RepairQueue(const SubdivisionCandidateContainer &dirtyList,
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| 301 | SplitQueue &splitQueue,
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| 302 | const bool recomputeSplitPlaneOnRepair);
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[1237] | 303 |
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[1625] | 304 | /** Collect subdivision candidates which were affected by the splits from the
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| 305 | chosenCandidates list.
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| 306 | */
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| 307 | void CollectDirtyCandidates(const SubdivisionCandidateContainer &chosenCandidates,
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| 308 | SubdivisionCandidateContainer &dirtyList);
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| 309 |
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[1580] | 310 | /** Evaluate subdivision stats for log.
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| 311 | */
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[1624] | 312 | void EvalSubdivisionStats();
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[1237] | 313 |
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[1625] | 314 | void AddSubdivisionStats(const int splits,
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| 315 | const float renderCostDecr,
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| 316 | const float totalRenderCost,
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| 317 | const int totalPvsEntries,
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[1640] | 318 | const float memory,
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[1654] | 319 | const float renderCostPerStorage,
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| 320 | const float vspOspRatio);
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[1237] | 321 |
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[1625] | 322 | bool AddSampleToPvs(Intersectable *obj,
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| 323 | const float pdf,
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| 324 | float &contribution) const;
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[1237] | 325 |
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[1625] | 326 | /** Collect affected view space candidates.
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| 327 | */
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| 328 | void CollectViewSpaceDirtyList(SubdivisionCandidate *sc,
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| 329 | SubdivisionCandidateContainer &dirtyList);
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[1259] | 330 |
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[1625] | 331 | /** Collect affected object space candidates.
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| 332 | */
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| 333 | void CollectObjectSpaceDirtyList(SubdivisionCandidate *sc,
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| 334 | SubdivisionCandidateContainer &dirtyList);
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[1259] | 335 |
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[1625] | 336 | /** Export object space partition tree.
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| 337 | */
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| 338 | void ExportOspTree(Exporter *exporter,
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| 339 | const ObjectContainer &objects) const;
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[1259] | 340 |
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[1625] | 341 | /** Parse the environment variables.
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| 342 | */
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[1418] | 343 | void ParseEnvironment();
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[1415] | 344 |
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[1418] | 345 | bool StartObjectSpaceSubdivision() const;
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| 346 | bool StartViewSpaceSubdivision() const;
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| 347 |
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[1667] | 348 |
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[1625] | 349 | ////////////////////////////
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| 350 | // Helper function for preparation of subdivision
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[1286] | 351 |
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[1625] | 352 | /** Prepare bv hierarchy for subdivision
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| 353 | */
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| 354 | SubdivisionCandidate *PrepareBvHierarchy(const VssRayContainer &sampleRays,
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| 355 | const ObjectContainer &objects);
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[1286] | 356 |
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[1625] | 357 | /** Prepare object space kd tree for subdivision.
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| 358 | */
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| 359 | SubdivisionCandidate *PrepareOspTree(const VssRayContainer &sampleRays,
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| 360 | const ObjectContainer &objects);
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[1308] | 361 |
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[1625] | 362 | /** Prepare view space subdivision and add candidate to queue.
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| 363 | */
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| 364 | SubdivisionCandidate *PrepareViewSpaceSubdivision(const VssRayContainer &sampleRays,
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| 365 | const ObjectContainer &objects);
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| 366 |
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| 367 | /** Was object space subdivision already constructed?
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| 368 | */
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[1313] | 369 | bool ObjectSpaceSubdivisionConstructed() const;
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[1625] | 370 |
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| 371 | /** Was view space subdivision already constructed?
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| 372 | */
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[1329] | 373 | bool ViewSpaceSubdivisionConstructed() const;
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[1311] | 374 |
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[1625] | 375 | /** Reset the split queue, i.e., reevaluate the split candidates.
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| 376 | */
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[1640] | 377 | void ResetQueue(SplitQueue &splitQueue, const bool recomputeSplitPlane);
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[1313] | 378 |
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[1625] | 379 | /** After the suddivision has ended, do some final tasks.
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| 380 | */
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[1654] | 381 | void FinishObjectSpaceSubdivision(const ObjectContainer &objects,
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| 382 | const bool removeRayRefs = true) const;
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[1313] | 383 |
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[1625] | 384 | /** Returns depth of object space subdivision.
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| 385 | */
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[1370] | 386 | int GetObjectSpaceSubdivisionDepth() const;
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| 387 |
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[1640] | 388 | /** Returns number of leaves in object space subdivision.
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| 389 | */
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| 390 | int GetObjectSpaceSubdivisionLeaves() const;
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[1663] | 391 | int GetObjectSpaceSubdivisionNodes() const;
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[1640] | 392 |
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[1625] | 393 | /** Construct object space partition interleaved with view space partition.
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| 394 | Each time the best object or view space candidate is selected
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| 395 | for the next split.
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| 396 | */
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[1626] | 397 | void ConstructInterleaved(const VssRayContainer &sampleRays,
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| 398 | const ObjectContainer &objects,
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| 399 | AxisAlignedBox3 *forcedViewSpace);
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[1449] | 400 |
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[1625] | 401 | /** Construct object space partition interleaved with view space partition.
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| 402 | The method chooses a number candidates of each type for subdivision.
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| 403 | The number is determined by the "gradient", i.e., the render cost decrease.
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| 404 | Once this render cost decrease is lower than the render cost decrease
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| 405 | for the splits of previous type, the method will stop current subdivision and
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| 406 | evaluate if view space or object space would be the beneficial for the
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| 407 | next number of split.
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| 408 | */
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[1626] | 409 | void ConstructInterleavedWithGradient(const VssRayContainer &sampleRays,
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| 410 | const ObjectContainer &objects,
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| 411 | AxisAlignedBox3 *forcedViewSpace);
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[1624] | 412 |
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[1548] | 413 | /** Use iteration to construct the object space hierarchy.
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| 414 | */
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[1626] | 415 | void ConstructMultiLevel(const VssRayContainer &sampleRays,
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| 416 | const ObjectContainer &objects,
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| 417 | AxisAlignedBox3 *forcedViewSpace);
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[1449] | 418 |
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[1640] | 419 | /** Based on a given subdivision, we try to optimize using an
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| 420 | multiple iteration over view and object space.
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| 421 | */
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| 422 | void OptimizeMultiLevel(const VssRayContainer &sampleRays,
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| 423 | const ObjectContainer &objects,
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| 424 | AxisAlignedBox3 *forcedViewSpace);
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| 425 |
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[1548] | 426 | /** Reset the object space subdivision.
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| 427 | E.g., deletes hierarchy and resets stats.
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| 428 | so construction can be restarted.
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| 429 | */
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[1625] | 430 | SubdivisionCandidate *ResetObjectSpaceSubdivision(const VssRayContainer &rays,
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| 431 | const ObjectContainer &objects);
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[1449] | 432 |
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[1625] | 433 | SubdivisionCandidate *ResetViewSpaceSubdivision(const VssRayContainer &rays,
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[1642] | 434 | const ObjectContainer &objects,
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| 435 | AxisAlignedBox3 *forcedViewSpace);
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[1557] | 436 |
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[1614] | 437 |
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[1237] | 438 | protected:
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| 439 |
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[1627] | 440 | /** construction types
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| 441 | sequential: construct first view space, then object space
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| 442 | interleaved: construct view space and object space fully interleaved
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| 443 | gradient: construct view space / object space until a threshold is reached
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| 444 | multilevel: iterate until subdivisions converge to the optimum.
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| 445 | */
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| 446 | enum {SEQUENTIAL, INTERLEAVED, GRADIENT, MULTILEVEL};
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| 447 |
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[1580] | 448 | /// type of hierarchy construction
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| 449 | int mConstructionType;
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| 450 |
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| 451 | /// Type of object space partition
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[1308] | 452 | int mObjectSpaceSubdivisionType;
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[1580] | 453 | /// Type of view space partition
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[1329] | 454 | int mViewSpaceSubdivisionType;
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| 455 |
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[1589] | 456 | /// the traversal queue
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| 457 | SplitQueue mTQueue;
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| 458 |
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[1580] | 459 | ////////////
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| 460 | //-- helper variables
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| 461 |
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| 462 | // the original osp type
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[1323] | 463 | int mSavedObjectSpaceSubdivisionType;
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[1580] | 464 | // the original vsp type
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[1329] | 465 | int mSavedViewSpaceSubdivisionType;
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[1580] | 466 | /// the current subdivision candidate
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[1624] | 467 | //SubdivisionCandidate *mCurrentCandidate;
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[1323] | 468 |
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[1259] | 469 |
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[1580] | 470 | ///////////////////
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| 471 | // Hierarchies
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| 472 |
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| 473 | /// view space hierarchy
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[1259] | 474 | VspTree *mVspTree;
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[1580] | 475 | /// object space partition kd tree
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[1259] | 476 | OspTree *mOspTree;
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[1625] | 477 |
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[1589] | 478 | public:
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[1580] | 479 | /// bounding volume hierarchy
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[1259] | 480 | BvHierarchy *mBvHierarchy;
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[1580] | 481 |
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[1589] | 482 | protected:
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[1237] | 483 |
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| 484 |
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[1580] | 485 | //////////
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[1576] | 486 | //-- global termination criteria
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| 487 |
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[1580] | 488 | /// the mininal acceptable cost ratio for a split
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[1237] | 489 | float mTermMinGlobalCostRatio;
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[1580] | 490 | /// the threshold for global cost miss tolerance
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[1237] | 491 | int mTermGlobalCostMissTolerance;
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[1580] | 492 | /// maximum number of leaves
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| 493 | int mTermMaxLeaves;
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[1649] | 494 | /// Maximal allowed memory consumption.
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| 495 | float mTermMaxMemory;
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[1580] | 496 |
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[1667] | 497 |
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[1576] | 498 | ////////////////////
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| 499 |
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[1667] | 500 | /// number of minimal steps of the same type
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[1640] | 501 | int mMinStepsOfSameType;
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| 502 |
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[1580] | 503 | /// statistics about the hierarchy
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[1288] | 504 | HierarchyStatistics mHierarchyStats;
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| 505 |
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[1308] | 506 | int mMinDepthForObjectSpaceSubdivion;
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[1370] | 507 | int mMinDepthForViewSpaceSubdivion;
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[1580] | 508 |
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[1625] | 509 | //int mMinRenderCostDecrease;
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[1624] | 510 |
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[1237] | 511 | ofstream mSubdivisionStats;
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[1314] | 512 |
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[1580] | 513 | /// if the queue should be repaired after a subdivision steps
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[1314] | 514 | bool mRepairQueue;
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[1370] | 515 |
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| 516 | bool mStartWithObjectSpace;
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[1580] | 517 | /** if multi level construction method should be used
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| 518 | where we iterate over both hierarchies until we
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| 519 | converge to the optimum.
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| 520 | */
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[1449] | 521 | bool mUseMultiLevelConstruction;
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[1640] | 522 |
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[1580] | 523 | /// number of iteration steps for multilevel approach
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| 524 | int mNumMultiLevels;
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[1640] | 525 |
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[1633] | 526 | /** if split plane should be recomputed for the repair.
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| 527 | Otherwise only the priority is recomputed, the
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| 528 | split plane itself stays the same
|
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| 529 | */
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| 530 | bool mRecomputeSplitPlaneOnRepair;
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[1662] | 531 |
|
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| 532 | /** If memory should be considered during choosing
|
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| 533 | of the next split type during gradient method.
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| 534 | */
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| 535 | bool mConsiderMemory;
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[1666] | 536 |
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[1673] | 537 | /// constant value for driving the heuristics
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[1666] | 538 | float mMemoryConst;
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[1673] | 539 |
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| 540 | bool mConsiderMemory2;
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[1667] | 541 |
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| 542 | friend VspTree;
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| 543 | friend OspTree;
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| 544 | friend BvHierarchy;
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| 545 | friend ViewCellsParseHandlers;
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| 546 |
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[1237] | 547 | };
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| 548 |
|
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| 549 | }
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| 550 |
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| 551 | #endif
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