[1237] | 1 | #include <stack>
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| 2 | #include <time.h>
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| 3 | #include <iomanip>
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| 4 |
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| 5 | #include "BvHierarchy.h"
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| 6 | #include "ViewCell.h"
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| 7 | #include "Plane3.h"
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| 8 | #include "Mesh.h"
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| 9 | #include "common.h"
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| 10 | #include "Environment.h"
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| 11 | #include "Polygon3.h"
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| 12 | #include "Ray.h"
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| 13 | #include "AxisAlignedBox3.h"
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| 14 | #include "Exporter.h"
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| 15 | #include "Plane3.h"
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| 16 | #include "ViewCellsManager.h"
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| 17 | #include "Beam.h"
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| 18 | #include "VspTree.h"
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[1370] | 19 | #include "HierarchyManager.h"
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[1237] | 20 |
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| 21 |
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| 22 | namespace GtpVisibilityPreprocessor {
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| 23 |
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| 24 |
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[1370] | 25 | #define PROBABILIY_IS_BV_VOLUME 1
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[1237] | 26 | #define USE_FIXEDPOINT_T 0
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[1662] | 27 | #define USE_VOLUMES_FOR_HEURISTICS 1
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| 28 |
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[1357] | 29 | int BvhNode::sMailId = 10000; //2147483647;
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[1291] | 30 | int BvhNode::sReservedMailboxes = 1;
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| 31 |
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[1237] | 32 | BvHierarchy *BvHierarchy::BvhSubdivisionCandidate::sBvHierarchy = NULL;
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| 33 |
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| 34 |
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[1357] | 35 | /// sorting operator
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[1237] | 36 | inline static bool ilt(Intersectable *obj1, Intersectable *obj2)
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| 37 | {
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| 38 | return obj1->mId < obj2->mId;
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| 39 | }
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| 40 |
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| 41 |
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| 42 | /***************************************************************/
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| 43 | /* class BvhNode implementation */
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| 44 | /***************************************************************/
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| 45 |
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[1679] | 46 | BvhNode::BvhNode():
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| 47 | mParent(NULL),
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| 48 | mMailbox(0),
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| 49 | mRenderCostDecr(0),
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| 50 | mMemoryIncr(0),
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| 51 | mPvsEntriesIncr(0),
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| 52 | mTimeStamp(0)
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[1237] | 53 | {
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[1709] | 54 |
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[1237] | 55 | }
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| 56 |
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| 57 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox):
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[1679] | 58 | mParent(NULL),
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| 59 | mBoundingBox(bbox),
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| 60 | mMailbox(0),
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| 61 | mMemoryIncr(0),
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[1692] | 62 | mRenderCostDecr(0),
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[1679] | 63 | mPvsEntriesIncr(0),
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| 64 | mTimeStamp(0)
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[1237] | 65 | {
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| 66 | }
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| 67 |
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| 68 |
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| 69 | BvhNode::BvhNode(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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[1679] | 70 | mBoundingBox(bbox),
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| 71 | mParent(parent),
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| 72 | mMailbox(0),
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| 73 | mMemoryIncr(0),
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[1692] | 74 | mRenderCostDecr(0),
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[1679] | 75 | mPvsEntriesIncr(0),
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| 76 | mTimeStamp(0)
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[1237] | 77 | {
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| 78 | }
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| 79 |
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| 80 |
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| 81 | bool BvhNode::IsRoot() const
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| 82 | {
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| 83 | return mParent == NULL;
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| 84 | }
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| 85 |
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| 86 |
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| 87 | BvhInterior *BvhNode::GetParent()
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| 88 | {
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| 89 | return mParent;
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| 90 | }
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| 91 |
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| 92 |
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| 93 | void BvhNode::SetParent(BvhInterior *parent)
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| 94 | {
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| 95 | mParent = parent;
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| 96 | }
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| 97 |
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| 98 |
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| 99 |
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| 100 | /******************************************************************/
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| 101 | /* class BvhInterior implementation */
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| 102 | /******************************************************************/
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| 103 |
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| 104 |
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| 105 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox):
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[1709] | 106 | BvhNode(bbox),
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| 107 | mSubdivisionCandidate(NULL)
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[1237] | 108 | {
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[1709] | 109 | mActiveNode = this;
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[1237] | 110 | }
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| 111 |
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| 112 |
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| 113 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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| 114 | BvhNode(bbox, parent)
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| 115 | {
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[1709] | 116 | mActiveNode = this;
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[1237] | 117 | }
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| 118 |
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| 119 |
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[1287] | 120 | BvhLeaf::BvhLeaf(const AxisAlignedBox3 &bbox,
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| 121 | BvhInterior *parent,
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| 122 | const int numObjects):
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[1237] | 123 | BvhNode(bbox, parent)
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| 124 | {
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| 125 | mObjects.reserve(numObjects);
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[1709] | 126 | mActiveNode = this;
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[1237] | 127 | }
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| 128 |
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| 129 |
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| 130 | bool BvhLeaf::IsLeaf() const
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| 131 | {
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| 132 | return true;
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| 133 | }
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| 134 |
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| 135 |
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| 136 | BvhLeaf::~BvhLeaf()
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| 137 | {
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| 138 | }
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| 139 |
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[1686] | 140 |
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[1614] | 141 | void BvhLeaf::CollectObjects(ObjectContainer &objects)
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| 142 | {
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[1686] | 143 | ObjectContainer::const_iterator oit, oit_end = mObjects.end();
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| 144 | for (oit = mObjects.begin(); oit != oit_end; ++ oit)
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[1614] | 145 | {
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| 146 | objects.push_back(*oit);
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| 147 | }
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| 148 | }
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[1237] | 149 |
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| 150 | /******************************************************************/
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| 151 | /* class BvhInterior implementation */
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| 152 | /******************************************************************/
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| 153 |
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| 154 |
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| 155 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox):
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[1287] | 156 | BvhNode(bbox), mFront(NULL), mBack(NULL)
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[1237] | 157 | {
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| 158 | }
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| 159 |
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| 160 |
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| 161 | BvhInterior::BvhInterior(const AxisAlignedBox3 &bbox, BvhInterior *parent):
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[1287] | 162 | BvhNode(bbox, parent), mFront(NULL), mBack(NULL)
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[1237] | 163 | {
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| 164 | }
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| 165 |
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| 166 |
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| 167 | void BvhInterior::ReplaceChildLink(BvhNode *oldChild, BvhNode *newChild)
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| 168 | {
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| 169 | if (mBack == oldChild)
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| 170 | mBack = newChild;
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| 171 | else
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| 172 | mFront = newChild;
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| 173 | }
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| 174 |
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| 175 |
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| 176 | bool BvhInterior::IsLeaf() const
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| 177 | {
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| 178 | return false;
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| 179 | }
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| 180 |
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| 181 |
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| 182 | BvhInterior::~BvhInterior()
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| 183 | {
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| 184 | DEL_PTR(mFront);
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| 185 | DEL_PTR(mBack);
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| 186 | }
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| 187 |
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| 188 |
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| 189 | void BvhInterior::SetupChildLinks(BvhNode *front, BvhNode *back)
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| 190 | {
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| 191 | mBack = back;
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| 192 | mFront = front;
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| 193 | }
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| 194 |
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| 195 |
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[1614] | 196 | void BvhInterior::CollectObjects(ObjectContainer &objects)
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| 197 | {
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| 198 | mFront->CollectObjects(objects);
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| 199 | mBack->CollectObjects(objects);
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| 200 | }
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[1237] | 201 |
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[1614] | 202 |
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[1237] | 203 | /*******************************************************************/
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| 204 | /* class BvHierarchy implementation */
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| 205 | /*******************************************************************/
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| 206 |
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| 207 |
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| 208 | BvHierarchy::BvHierarchy():
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| 209 | mRoot(NULL),
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| 210 | mTimeStamp(1)
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| 211 | {
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| 212 | ReadEnvironment();
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[1357] | 213 | mSubdivisionCandidates = new SortableEntryContainer;
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[1580] | 214 | for (int i = 0; i < 3; ++ i)
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| 215 | mSortedObjects[i] = NULL;
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[1237] | 216 | }
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| 217 |
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| 218 |
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| 219 | BvHierarchy::~BvHierarchy()
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| 220 | {
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[1696] | 221 | // delete bvh intersectables
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[1237] | 222 | BvhIntersectableMap::iterator it, it_end = mBvhIntersectables.end();
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| 223 |
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| 224 | for (it = mBvhIntersectables.begin(); it != mBvhIntersectables.end(); ++ it)
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| 225 | {
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| 226 | DEL_PTR((*it).second);
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| 227 | }
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| 228 |
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[1696] | 229 | // delete the local subdivision candidates
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[1237] | 230 | DEL_PTR(mSubdivisionCandidates);
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| 231 |
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[1696] | 232 | // delete the presorted objects
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[1580] | 233 | for (int i = 0; i < 3; ++ i)
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| 234 | {
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| 235 | DEL_PTR(mSortedObjects[i]);
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| 236 | }
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[1696] | 237 |
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| 238 | // delete the tree
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| 239 | DEL_PTR(mRoot);
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[1237] | 240 | }
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| 241 |
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| 242 |
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| 243 | void BvHierarchy::ReadEnvironment()
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| 244 | {
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| 245 | bool randomize = false;
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| 246 | Environment::GetSingleton()->GetBoolValue("VspTree.Construction.randomize", randomize);
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[1698] | 247 |
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| 248 | // initialise random generator for heuristics
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[1237] | 249 | if (randomize)
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[1698] | 250 | Randomize();
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[1237] | 251 |
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[1698] | 252 | //////////////////////////////
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[1237] | 253 | //-- termination criteria for autopartition
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[1643] | 254 |
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[1288] | 255 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxDepth", mTermMaxDepth);
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| 256 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.maxLeaves", mTermMaxLeaves);
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| 257 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minObjects", mTermMinObjects);
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[1370] | 258 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.minRays", mTermMinRays);
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[1698] | 259 | Environment::GetSingleton()->GetFloatValue(
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| 260 | "BvHierarchy.Termination.minProbability", mTermMinProbability);
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| 261 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.missTolerance", mTermMissTolerance);
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[1370] | 262 |
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| 263 |
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[1421] | 264 | //////////////////////////////
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[1237] | 265 | //-- max cost ratio for early tree termination
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[1370] | 266 |
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[1288] | 267 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.maxCostRatio", mTermMaxCostRatio);
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| 268 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.Termination.minGlobalCostRatio",
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[1237] | 269 | mTermMinGlobalCostRatio);
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[1294] | 270 | Environment::GetSingleton()->GetIntValue("BvHierarchy.Termination.globalCostMissTolerance",
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| 271 | mTermGlobalCostMissTolerance);
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[1237] | 272 |
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| 273 |
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[1421] | 274 | //////////////////////////////
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[1370] | 275 | //-- factors for subdivision heuristics
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| 276 |
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| 277 | // if only the driving axis is used for splits
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[1288] | 278 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
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| 279 | Environment::GetSingleton()->GetFloatValue("BvHierarchy.maxStaticMemory", mMaxMemory);
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| 280 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useCostHeuristics", mUseCostHeuristics);
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[1643] | 281 | Environment::GetSingleton()->GetBoolValue("BvHierarchy.useSah", mUseSah);
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[1676] | 282 |
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| 283 | char subdivisionStatsLog[100];
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[1288] | 284 | Environment::GetSingleton()->GetStringValue("BvHierarchy.subdivisionStats", subdivisionStatsLog);
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[1237] | 285 | mSubdivisionStats.open(subdivisionStatsLog);
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| 286 |
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[1288] | 287 | Environment::GetSingleton()->GetFloatValue(
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| 288 | "BvHierarchy.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
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[1237] | 289 |
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[1698] | 290 | Environment::GetSingleton()->GetBoolValue(
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| 291 | "BvHierarchy.Construction.useGlobalSorting", mUseGlobalSorting);
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| 292 |
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[1676] | 293 | Environment::GetSingleton()->GetIntValue("BvHierarchy.minRaysForVisibility", mMinRaysForVisibility);
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| 294 |
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[1662] | 295 | mUseBboxAreaForSah = true;
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[1357] | 296 |
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[1698] | 297 |
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[1421] | 298 | /////////////
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[1237] | 299 | //-- debug output
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[1359] | 300 |
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[1237] | 301 | Debug << "******* Bvh hierarchy options ******** " << endl;
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| 302 | Debug << "max depth: " << mTermMaxDepth << endl;
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[1287] | 303 | Debug << "min probabiliy: " << mTermMinProbability<< endl;
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[1237] | 304 | Debug << "min objects: " << mTermMinObjects << endl;
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| 305 | Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
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| 306 | Debug << "miss tolerance: " << mTermMissTolerance << endl;
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| 307 | Debug << "max leaves: " << mTermMaxLeaves << endl;
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| 308 | Debug << "randomize: " << randomize << endl;
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| 309 | Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
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| 310 | Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
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| 311 | Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
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| 312 | Debug << "max memory: " << mMaxMemory << endl;
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| 313 | Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
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[1705] | 314 | Debug << "use sah (surface area heuristics: " << mUseSah << endl;
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[1237] | 315 | Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
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| 316 | Debug << "split borders: " << mSplitBorder << endl;
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| 317 | Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
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[1357] | 318 | Debug << "use global sort: " << mUseGlobalSorting << endl;
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[1676] | 319 | Debug << "minimal rays for visibility: " << mMinRaysForVisibility << endl;
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| 320 |
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[1237] | 321 | Debug << endl;
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| 322 | }
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| 323 |
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| 324 |
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[1486] | 325 | void BvHierarchy::AssociateObjectsWithLeaf(BvhLeaf *leaf)
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[1237] | 326 | {
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| 327 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
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[1693] | 328 |
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[1237] | 329 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
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| 330 | {
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| 331 | (*oit)->mBvhLeaf = leaf;
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| 332 | }
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| 333 | }
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| 334 |
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[1486] | 335 |
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[1370] | 336 | static int CountRays(const ObjectContainer &objects)
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| 337 | {
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| 338 | int nRays = 0;
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[1237] | 339 |
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[1370] | 340 | ObjectContainer::const_iterator oit, oit_end = objects.end();
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| 341 |
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| 342 | for (oit = objects.begin(); oit != oit_end; ++ oit)
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| 343 | {
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[1696] | 344 | nRays += (int)(*oit)->GetOrCreateRays()->size();
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[1370] | 345 | }
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| 346 |
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| 347 | return nRays;
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| 348 | }
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[1680] | 349 |
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| 350 |
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[1345] | 351 | BvhInterior *BvHierarchy::SubdivideNode(const BvhSubdivisionCandidate &sc,
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[1237] | 352 | BvhTraversalData &frontData,
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| 353 | BvhTraversalData &backData)
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| 354 | {
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[1345] | 355 | const BvhTraversalData &tData = sc.mParentData;
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[1237] | 356 | BvhLeaf *leaf = tData.mNode;
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[1370] | 357 | AxisAlignedBox3 parentBox = leaf->GetBoundingBox();
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[1237] | 358 |
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[1421] | 359 | // update stats: we have two new leaves
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| 360 | mBvhStats.nodes += 2;
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[1379] | 361 |
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| 362 | if (tData.mDepth > mBvhStats.maxDepth)
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| 363 | {
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| 364 | mBvhStats.maxDepth = tData.mDepth;
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| 365 | }
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| 366 |
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[1237] | 367 | // add the new nodes to the tree
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[1370] | 368 | BvhInterior *node = new BvhInterior(parentBox, leaf->GetParent());
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[1294] | 369 |
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[1237] | 370 |
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[1421] | 371 | //////////////////
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[1237] | 372 | //-- create front and back leaf
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| 373 |
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[1405] | 374 | AxisAlignedBox3 fbox = EvalBoundingBox(sc.mFrontObjects, &parentBox);
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| 375 | AxisAlignedBox3 bbox = EvalBoundingBox(sc.mBackObjects, &parentBox);
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[1370] | 376 |
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[1684] | 377 | BvhLeaf *back = new BvhLeaf(bbox, node, (int)sc.mBackObjects.size());
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| 378 | BvhLeaf *front = new BvhLeaf(fbox, node, (int)sc.mFrontObjects.size());
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[1237] | 379 |
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| 380 | BvhInterior *parent = leaf->GetParent();
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| 381 |
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| 382 | // replace a link from node's parent
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| 383 | if (parent)
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| 384 | {
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| 385 | parent->ReplaceChildLink(leaf, node);
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| 386 | node->SetParent(parent);
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| 387 | }
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[1345] | 388 | else // no parent => this node is the root
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[1237] | 389 | {
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| 390 | mRoot = node;
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| 391 | }
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| 392 |
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| 393 | // and setup child links
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| 394 | node->SetupChildLinks(front, back);
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| 395 |
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| 396 | ++ mBvhStats.splits;
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| 397 |
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| 398 |
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[1421] | 399 | ////////////////////////////////////////
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[1370] | 400 | //-- fill front and back traversal data with the new values
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| 401 |
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| 402 | frontData.mDepth = backData.mDepth = tData.mDepth + 1;
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| 403 |
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[1237] | 404 | frontData.mNode = front;
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| 405 | backData.mNode = back;
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| 406 |
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[1345] | 407 | back->mObjects = sc.mBackObjects;
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| 408 | front->mObjects = sc.mFrontObjects;
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[1237] | 409 |
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[1370] | 410 | // if the number of rays is too low, no assumptions can be made
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| 411 | // (=> switch to surface area heuristics?)
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| 412 | frontData.mNumRays = CountRays(sc.mFrontObjects);
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| 413 | backData.mNumRays = CountRays(sc.mBackObjects);
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| 414 |
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[1237] | 415 | AssociateObjectsWithLeaf(back);
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| 416 | AssociateObjectsWithLeaf(front);
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| 417 |
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[1370] | 418 | #if PROBABILIY_IS_BV_VOLUME
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| 419 | // volume of bvh (= probability that this bvh can be seen)
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| 420 | frontData.mProbability = fbox.GetVolume();
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| 421 | backData.mProbability = bbox.GetVolume();
|
---|
| 422 | #else
|
---|
[1345] | 423 | // compute probability of this node being visible,
|
---|
| 424 | // i.e., volume of the view cells that can see this node
|
---|
| 425 | frontData.mProbability = EvalViewCellsVolume(sc.mFrontObjects);
|
---|
| 426 | backData.mProbability = EvalViewCellsVolume(sc.mBackObjects);
|
---|
[1370] | 427 | #endif
|
---|
[1237] | 428 |
|
---|
[1345] | 429 | // how often was max cost ratio missed in this branch?
|
---|
[1576] | 430 | frontData.mMaxCostMisses = sc.GetMaxCostMisses();
|
---|
| 431 | backData.mMaxCostMisses = sc.GetMaxCostMisses();
|
---|
[1345] | 432 |
|
---|
[1687] | 433 | // set the time stamp so the order of traversal can be reconstructed
|
---|
| 434 | node->mTimeStamp = mHierarchyManager->mTimeStamp ++;
|
---|
| 435 |
|
---|
[1357] | 436 | // assign the objects in sorted order
|
---|
| 437 | if (mUseGlobalSorting)
|
---|
| 438 | {
|
---|
| 439 | AssignSortedObjects(sc, frontData, backData);
|
---|
| 440 | }
|
---|
| 441 |
|
---|
[1345] | 442 | // return the new interior node
|
---|
[1237] | 443 | return node;
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 |
|
---|
| 447 | BvhNode *BvHierarchy::Subdivide(SplitQueue &tQueue,
|
---|
| 448 | SubdivisionCandidate *splitCandidate,
|
---|
| 449 | const bool globalCriteriaMet)
|
---|
| 450 | {
|
---|
[1667] | 451 | BvhSubdivisionCandidate *sc = dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
|
---|
[1237] | 452 | BvhTraversalData &tData = sc->mParentData;
|
---|
| 453 |
|
---|
[1345] | 454 | BvhNode *currentNode = tData.mNode;
|
---|
[1237] | 455 |
|
---|
| 456 | if (!LocalTerminationCriteriaMet(tData) && !globalCriteriaMet)
|
---|
| 457 | {
|
---|
[1421] | 458 | //////////////
|
---|
[1294] | 459 | //-- continue subdivision
|
---|
| 460 |
|
---|
[1237] | 461 | BvhTraversalData tFrontData;
|
---|
| 462 | BvhTraversalData tBackData;
|
---|
[1294] | 463 |
|
---|
[1237] | 464 | // create new interior node and two leaf node
|
---|
[1664] | 465 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
|
---|
[1237] | 466 |
|
---|
[1287] | 467 | // decrease the weighted average cost of the subdivisoin
|
---|
[1237] | 468 | mTotalCost -= sc->GetRenderCostDecrease();
|
---|
[1662] | 469 | mPvsEntries += sc->GetPvsEntriesIncr();
|
---|
[1237] | 470 |
|
---|
| 471 | // subdivision statistics
|
---|
[1287] | 472 | if (1) PrintSubdivisionStats(*sc);
|
---|
[1237] | 473 |
|
---|
[1345] | 474 |
|
---|
[1421] | 475 | ///////////////////////////
|
---|
[1237] | 476 | //-- push the new split candidates on the queue
|
---|
| 477 |
|
---|
[1667] | 478 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
|
---|
| 479 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
|
---|
[1237] | 480 |
|
---|
| 481 | EvalSubdivisionCandidate(*frontCandidate);
|
---|
| 482 | EvalSubdivisionCandidate(*backCandidate);
|
---|
[1297] | 483 |
|
---|
| 484 | // cross reference
|
---|
| 485 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
|
---|
| 486 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
|
---|
[1305] | 487 |
|
---|
[1664] | 488 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
|
---|
[1237] | 489 | tQueue.Push(frontCandidate);
|
---|
| 490 | tQueue.Push(backCandidate);
|
---|
| 491 | }
|
---|
| 492 |
|
---|
[1345] | 493 | /////////////////////////////////
|
---|
| 494 | //-- node is a leaf => terminate traversal
|
---|
[1237] | 495 |
|
---|
[1345] | 496 | if (currentNode->IsLeaf())
|
---|
[1237] | 497 | {
|
---|
[1664] | 498 | /////////////////////
|
---|
[1297] | 499 | //-- store additional info
|
---|
[1237] | 500 | EvaluateLeafStats(tData);
|
---|
| 501 |
|
---|
[1297] | 502 | const bool mStoreRays = true;
|
---|
[1237] | 503 | if (mStoreRays)
|
---|
| 504 | {
|
---|
[1345] | 505 | BvhLeaf *leaf = dynamic_cast<BvhLeaf *>(currentNode);
|
---|
[1237] | 506 | CollectRays(leaf->mObjects, leaf->mVssRays);
|
---|
| 507 | }
|
---|
[1305] | 508 |
|
---|
[1345] | 509 | //////////////////////////////////////
|
---|
| 510 |
|
---|
| 511 | // this leaf is no candidate for splitting anymore
|
---|
| 512 | // => detach subdivision candidate
|
---|
[1305] | 513 | tData.mNode->SetSubdivisionCandidate(NULL);
|
---|
[1345] | 514 | // detach node so we don't delete it with the traversal data
|
---|
[1294] | 515 | tData.mNode = NULL;
|
---|
[1237] | 516 | }
|
---|
| 517 |
|
---|
[1345] | 518 | return currentNode;
|
---|
[1237] | 519 | }
|
---|
| 520 |
|
---|
| 521 |
|
---|
[1667] | 522 | void BvHierarchy::EvalSubdivisionCandidate(BvhSubdivisionCandidate &splitCandidate,
|
---|
| 523 | bool computeSplitPlane)
|
---|
[1237] | 524 | {
|
---|
[1667] | 525 | if (computeSplitPlane)
|
---|
| 526 | {
|
---|
[1698] | 527 | const bool sufficientSamples =
|
---|
| 528 | splitCandidate.mParentData.mNumRays > mMinRaysForVisibility;
|
---|
[1676] | 529 |
|
---|
| 530 | const bool useVisibiliyBasedHeuristics =
|
---|
| 531 | !mUseSah &&
|
---|
[1698] | 532 | (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
| 533 | HierarchyManager::KD_BASED_VIEWSPACE_SUBDIV) &&
|
---|
[1676] | 534 | sufficientSamples;
|
---|
| 535 |
|
---|
[1667] | 536 | // compute best object partition
|
---|
| 537 | const float ratio = SelectObjectPartition(splitCandidate.mParentData,
|
---|
| 538 | splitCandidate.mFrontObjects,
|
---|
[1676] | 539 | splitCandidate.mBackObjects,
|
---|
| 540 | useVisibiliyBasedHeuristics);
|
---|
[1287] | 541 |
|
---|
[1667] | 542 | // cost ratio violated?
|
---|
| 543 | const bool maxCostRatioViolated = mTermMaxCostRatio < ratio;
|
---|
| 544 | const int previousMisses = splitCandidate.mParentData.mMaxCostMisses;
|
---|
[1287] | 545 |
|
---|
[1676] | 546 | splitCandidate.SetMaxCostMisses(maxCostRatioViolated ? previousMisses + 1 : previousMisses);
|
---|
[1663] | 547 |
|
---|
[1667] | 548 | }
|
---|
[1288] | 549 |
|
---|
[1667] | 550 | BvhLeaf *leaf = splitCandidate.mParentData.mNode;
|
---|
| 551 |
|
---|
[1302] | 552 | const float oldProp = EvalViewCellsVolume(leaf->mObjects);
|
---|
[1379] | 553 | const float oldRenderCost = EvalRenderCost(leaf->mObjects);
|
---|
| 554 |
|
---|
[1237] | 555 | // compute global decrease in render cost
|
---|
[1667] | 556 | const float newRenderCost = EvalRenderCost(splitCandidate.mFrontObjects) +
|
---|
| 557 | EvalRenderCost(splitCandidate.mBackObjects);
|
---|
[1237] | 558 |
|
---|
[1287] | 559 | const float renderCostDecr = oldRenderCost - newRenderCost;
|
---|
[1633] | 560 |
|
---|
[1663] | 561 | splitCandidate.SetRenderCostDecrease(renderCostDecr);
|
---|
| 562 |
|
---|
| 563 | // increase in pvs entries
|
---|
| 564 | const int pvsEntriesIncr = EvalPvsEntriesIncr(splitCandidate);
|
---|
| 565 | splitCandidate.SetPvsEntriesIncr(pvsEntriesIncr);
|
---|
| 566 |
|
---|
[1522] | 567 | #ifdef _DEBUG
|
---|
[1379] | 568 | Debug << "old render cost: " << oldRenderCost << endl;
|
---|
| 569 | Debug << "new render cost: " << newRenderCost << endl;
|
---|
| 570 | Debug << "render cost decrease: " << renderCostDecr << endl;
|
---|
[1522] | 571 | #endif
|
---|
[1576] | 572 |
|
---|
[1635] | 573 | float priority;
|
---|
[1664] | 574 |
|
---|
[1667] | 575 | // surface area heuristics is used when there is no view space subdivision available.
|
---|
| 576 | // In order to have some prioritized traversal, use this formula instead
|
---|
[1635] | 577 | if (mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
| 578 | HierarchyManager::NO_VIEWSPACE_SUBDIV)
|
---|
| 579 | {
|
---|
[1705] | 580 | priority = EvalSahCost(leaf);
|
---|
[1635] | 581 | }
|
---|
| 582 | else
|
---|
| 583 | {
|
---|
[1667] | 584 | // take render cost of node into account
|
---|
| 585 | // otherwise danger of being stuck in a local minimum!
|
---|
[1663] | 586 | const float factor = mRenderCostDecreaseWeight;
|
---|
[1665] | 587 | priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
|
---|
| 588 |
|
---|
[1673] | 589 | if (mHierarchyManager->mConsiderMemory2)
|
---|
[1664] | 590 | {
|
---|
[1666] | 591 | priority /= ((float)splitCandidate.GetPvsEntriesIncr() + mHierarchyManager->mMemoryConst);
|
---|
[1664] | 592 | }
|
---|
[1635] | 593 | }
|
---|
| 594 |
|
---|
[1664] | 595 | // compute global decrease in render cost
|
---|
[1237] | 596 | splitCandidate.SetPriority(priority);
|
---|
| 597 | }
|
---|
| 598 |
|
---|
| 599 |
|
---|
[1576] | 600 | int BvHierarchy::EvalPvsEntriesIncr(BvhSubdivisionCandidate &splitCandidate) const
|
---|
| 601 | {
|
---|
| 602 | const int oldPvsSize = CountViewCells(splitCandidate.mParentData.mNode->mObjects);
|
---|
| 603 |
|
---|
| 604 | const int fPvsSize = CountViewCells(splitCandidate.mFrontObjects);
|
---|
| 605 | const int bPvsSize = CountViewCells(splitCandidate.mBackObjects);
|
---|
| 606 |
|
---|
| 607 | return fPvsSize + bPvsSize - oldPvsSize;
|
---|
| 608 | }
|
---|
| 609 |
|
---|
| 610 |
|
---|
[1251] | 611 | inline bool BvHierarchy::LocalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
[1237] | 612 | {
|
---|
[1705] | 613 | const bool terminationCriteriaMet =
|
---|
| 614 | (0
|
---|
| 615 | || ((int)data.mNode->mObjects.size() <= 1)//mTermMinObjects)
|
---|
[1634] | 616 | //|| (data.mProbability <= mTermMinProbability)
|
---|
[1705] | 617 | //|| (data.mNumRays <= mTermMinRays)
|
---|
[1237] | 618 | );
|
---|
[1705] | 619 |
|
---|
| 620 | #ifdef _DEBUG
|
---|
| 621 | if (terminationCriteriaMet)
|
---|
| 622 | {
|
---|
| 623 | cout << "bvh local termination criteria met:" << endl;
|
---|
| 624 | cout << "objects: " << data.mNode->mObjects.size() << " " << mTermMinObjects << endl;
|
---|
| 625 | }
|
---|
| 626 | #endif
|
---|
| 627 | return terminationCriteriaMet;
|
---|
[1237] | 628 | }
|
---|
| 629 |
|
---|
| 630 |
|
---|
[1251] | 631 | inline bool BvHierarchy::GlobalTerminationCriteriaMet(const BvhTraversalData &data) const
|
---|
[1237] | 632 | {
|
---|
[1610] | 633 | // note: tracking for global cost termination
|
---|
| 634 | // does not make much sense for interleaved vsp / osp partition
|
---|
| 635 | // as it is the responsibility of the hierarchy manager
|
---|
| 636 |
|
---|
[1421] | 637 | const bool terminationCriteriaMet =
|
---|
| 638 | (0
|
---|
[1288] | 639 | || (mBvhStats.Leaves() >= mTermMaxLeaves)
|
---|
[1522] | 640 | //|| (mBvhStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
|
---|
[1288] | 641 | //|| mOutOfMemory
|
---|
[1237] | 642 | );
|
---|
[1421] | 643 |
|
---|
[1633] | 644 | #ifdef _DEBUG
|
---|
| 645 | if (terminationCriteriaMet)
|
---|
[1421] | 646 | {
|
---|
| 647 | Debug << "bvh global termination criteria met:" << endl;
|
---|
[1449] | 648 | Debug << "cost misses: " << mBvhStats.mGlobalCostMisses << " " << mTermGlobalCostMissTolerance << endl;
|
---|
[1421] | 649 | Debug << "leaves: " << mBvhStats.Leaves() << " " << mTermMaxLeaves << endl;
|
---|
| 650 | }
|
---|
[1633] | 651 | #endif
|
---|
[1421] | 652 | return terminationCriteriaMet;
|
---|
[1237] | 653 | }
|
---|
| 654 |
|
---|
| 655 |
|
---|
| 656 | void BvHierarchy::EvaluateLeafStats(const BvhTraversalData &data)
|
---|
| 657 | {
|
---|
| 658 | // the node became a leaf -> evaluate stats for leafs
|
---|
| 659 | BvhLeaf *leaf = data.mNode;
|
---|
| 660 |
|
---|
| 661 | ++ mCreatedLeaves;
|
---|
| 662 |
|
---|
[1370] | 663 |
|
---|
| 664 | if (data.mProbability <= mTermMinProbability)
|
---|
[1237] | 665 | {
|
---|
[1370] | 666 | ++ mBvhStats.minProbabilityNodes;
|
---|
[1237] | 667 | }
|
---|
| 668 |
|
---|
[1370] | 669 | ////////////////////////////////////////////
|
---|
| 670 | // depth related stuff
|
---|
| 671 |
|
---|
| 672 | if (data.mDepth < mBvhStats.minDepth)
|
---|
| 673 | {
|
---|
| 674 | mBvhStats.minDepth = data.mDepth;
|
---|
| 675 | }
|
---|
| 676 |
|
---|
| 677 | if (data.mDepth >= mTermMaxDepth)
|
---|
| 678 | {
|
---|
| 679 | ++ mBvhStats.maxDepthNodes;
|
---|
| 680 | }
|
---|
| 681 |
|
---|
[1237] | 682 | // accumulate depth to compute average depth
|
---|
| 683 | mBvhStats.accumDepth += data.mDepth;
|
---|
[1370] | 684 |
|
---|
| 685 |
|
---|
| 686 | ////////////////////////////////////////////
|
---|
| 687 | // objects related stuff
|
---|
| 688 |
|
---|
[1698] | 689 | // note: the sum should alwaysbe total number of objects for bvh
|
---|
[1370] | 690 | mBvhStats.objectRefs += (int)leaf->mObjects.size();
|
---|
| 691 |
|
---|
| 692 | if ((int)leaf->mObjects.size() <= mTermMinObjects)
|
---|
| 693 | {
|
---|
[1288] | 694 | ++ mBvhStats.minObjectsNodes;
|
---|
[1370] | 695 | }
|
---|
| 696 |
|
---|
[1408] | 697 | if (leaf->mObjects.empty())
|
---|
| 698 | {
|
---|
| 699 | ++ mBvhStats.emptyNodes;
|
---|
| 700 | }
|
---|
| 701 |
|
---|
[1370] | 702 | if ((int)leaf->mObjects.size() > mBvhStats.maxObjectRefs)
|
---|
| 703 | {
|
---|
[1237] | 704 | mBvhStats.maxObjectRefs = (int)leaf->mObjects.size();
|
---|
[1370] | 705 | }
|
---|
| 706 |
|
---|
| 707 | if ((int)leaf->mObjects.size() < mBvhStats.minObjectRefs)
|
---|
| 708 | {
|
---|
| 709 | mBvhStats.minObjectRefs = (int)leaf->mObjects.size();
|
---|
| 710 | }
|
---|
| 711 |
|
---|
| 712 | ////////////////////////////////////////////
|
---|
| 713 | // ray related stuff
|
---|
| 714 |
|
---|
| 715 | // note: this number should always accumulate to the total number of rays
|
---|
| 716 | mBvhStats.rayRefs += data.mNumRays;
|
---|
| 717 |
|
---|
| 718 | if (data.mNumRays <= mTermMinRays)
|
---|
| 719 | {
|
---|
| 720 | ++ mBvhStats.minRaysNodes;
|
---|
| 721 | }
|
---|
| 722 |
|
---|
| 723 | if (data.mNumRays > mBvhStats.maxRayRefs)
|
---|
| 724 | {
|
---|
| 725 | mBvhStats.maxRayRefs = data.mNumRays;
|
---|
| 726 | }
|
---|
| 727 |
|
---|
| 728 | if (data.mNumRays < mBvhStats.minRayRefs)
|
---|
| 729 | {
|
---|
| 730 | mBvhStats.minRayRefs = data.mNumRays;
|
---|
| 731 | }
|
---|
| 732 |
|
---|
[1705] | 733 | #ifdef _DEBUG
|
---|
[1370] | 734 | cout << "depth: " << data.mDepth << " objects: " << (int)leaf->mObjects.size()
|
---|
| 735 | << " rays: " << data.mNumRays << " rays / objects "
|
---|
| 736 | << (float)data.mNumRays / (float)leaf->mObjects.size() << endl;
|
---|
[1415] | 737 | #endif
|
---|
[1237] | 738 | }
|
---|
| 739 |
|
---|
| 740 |
|
---|
[1297] | 741 | #if 0
|
---|
[1370] | 742 |
|
---|
| 743 | /// compute object boundaries using spatial mid split
|
---|
[1287] | 744 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
| 745 | const int axis,
|
---|
| 746 | ObjectContainer &objectsFront,
|
---|
| 747 | ObjectContainer &objectsBack)
|
---|
[1237] | 748 | {
|
---|
[1287] | 749 | const float maxBox = tData.mBoundingBox.Max(axis);
|
---|
| 750 | const float minBox = tData.mBoundingBox.Min(axis);
|
---|
[1237] | 751 |
|
---|
[1287] | 752 | float midPoint = (maxBox + minBox) * 0.5f;
|
---|
| 753 |
|
---|
| 754 | ObjectContainer::const_iterator oit, oit_end = tData.mNode->mObjects.end();
|
---|
[1237] | 755 |
|
---|
[1287] | 756 | for (oit = tData.mNode->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
| 757 | {
|
---|
| 758 | Intersectable *obj = *oit;
|
---|
[1297] | 759 | const AxisAlignedBox3 box = obj->GetBox();
|
---|
[1291] | 760 |
|
---|
[1294] | 761 | const float objMid = (box.Max(axis) + box.Min(axis)) * 0.5f;
|
---|
[1291] | 762 |
|
---|
[1287] | 763 | // object mailed => belongs to back objects
|
---|
| 764 | if (objMid < midPoint)
|
---|
[1370] | 765 | {
|
---|
[1287] | 766 | objectsBack.push_back(obj);
|
---|
[1370] | 767 | }
|
---|
[1287] | 768 | else
|
---|
[1370] | 769 | {
|
---|
[1287] | 770 | objectsFront.push_back(obj);
|
---|
[1370] | 771 | }
|
---|
[1287] | 772 | }
|
---|
[1237] | 773 |
|
---|
[1379] | 774 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
[1705] | 775 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
[1237] | 776 |
|
---|
[1287] | 777 | const float ratio = newRenderCost / oldRenderCost;
|
---|
| 778 | return ratio;
|
---|
| 779 | }
|
---|
[1237] | 780 |
|
---|
[1297] | 781 | #else
|
---|
[1237] | 782 |
|
---|
[1370] | 783 | /// compute object partition by getting balanced objects on the left and right side
|
---|
[1297] | 784 | float BvHierarchy::EvalLocalObjectPartition(const BvhTraversalData &tData,
|
---|
| 785 | const int axis,
|
---|
| 786 | ObjectContainer &objectsFront,
|
---|
| 787 | ObjectContainer &objectsBack)
|
---|
| 788 | {
|
---|
[1357] | 789 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
[1297] | 790 |
|
---|
[1357] | 791 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
[1297] | 792 |
|
---|
| 793 | int i = 0;
|
---|
| 794 | const int border = (int)tData.mNode->mObjects.size() / 2;
|
---|
| 795 |
|
---|
| 796 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ i)
|
---|
| 797 | {
|
---|
| 798 | Intersectable *obj = (*cit).mObject;
|
---|
| 799 |
|
---|
| 800 | // object mailed => belongs to back objects
|
---|
| 801 | if (i < border)
|
---|
[1379] | 802 | {
|
---|
[1297] | 803 | objectsBack.push_back(obj);
|
---|
[1379] | 804 | }
|
---|
[1297] | 805 | else
|
---|
[1379] | 806 | {
|
---|
[1297] | 807 | objectsFront.push_back(obj);
|
---|
[1379] | 808 | }
|
---|
[1297] | 809 | }
|
---|
| 810 |
|
---|
[1705] | 811 | #if 1
|
---|
| 812 | const float cost = (tData.mNode->GetBoundingBox().Size().DrivingAxis() == axis) ? -1.0f : 0.0f;
|
---|
| 813 | #else
|
---|
| 814 | const float oldRenderCost = EvalRenderCost(tData.mNode->mObjects);
|
---|
| 815 | const float newRenderCost = EvalRenderCost(objectsFront) * EvalRenderCost(objectsBack);
|
---|
[1297] | 816 |
|
---|
[1705] | 817 | const float cost = newRenderCost / oldRenderCost;
|
---|
| 818 | #endif
|
---|
[1703] | 819 |
|
---|
[1705] | 820 | return cost;
|
---|
[1297] | 821 | }
|
---|
| 822 | #endif
|
---|
| 823 |
|
---|
| 824 |
|
---|
[1323] | 825 | float BvHierarchy::EvalSah(const BvhTraversalData &tData,
|
---|
| 826 | const int axis,
|
---|
| 827 | ObjectContainer &objectsFront,
|
---|
| 828 | ObjectContainer &objectsBack)
|
---|
| 829 | {
|
---|
| 830 | // go through the lists, count the number of objects left and right
|
---|
| 831 | // and evaluate the following cost funcion:
|
---|
[1698] | 832 | // C = ct_div_ci + (ol + or) / queries
|
---|
[1379] | 833 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
| 834 |
|
---|
[1698] | 835 | const float totalRenderCost = EvalAbsCost(tData.mNode->mObjects);
|
---|
| 836 | float objectsLeft = 0, objectsRight = totalRenderCost;
|
---|
[1323] | 837 |
|
---|
[1662] | 838 | const AxisAlignedBox3 nodeBbox = tData.mNode->GetBoundingBox();
|
---|
[1323] | 839 |
|
---|
[1662] | 840 | const float minBox = nodeBbox.Min(axis);
|
---|
| 841 | const float maxBox = nodeBbox.Max(axis);
|
---|
| 842 | const float boxArea = nodeBbox.SurfaceArea();
|
---|
[1323] | 843 |
|
---|
| 844 | float minSum = 1e20f;
|
---|
| 845 |
|
---|
| 846 | float minBorder = maxBox;
|
---|
| 847 | float maxBorder = minBox;
|
---|
[1379] | 848 | float areaLeft = 0, areaRight = 0;
|
---|
[1323] | 849 |
|
---|
[1357] | 850 | SortableEntryContainer::const_iterator currentPos =
|
---|
[1323] | 851 | mSubdivisionCandidates->begin();
|
---|
[1379] | 852 |
|
---|
| 853 | vector<float> bordersRight;
|
---|
| 854 |
|
---|
[1662] | 855 | if (mUseBboxAreaForSah)
|
---|
| 856 | {
|
---|
| 857 | // we keep track of both borders of the bounding boxes =>
|
---|
| 858 | // store the events in descending order
|
---|
| 859 |
|
---|
| 860 | bordersRight.resize(mSubdivisionCandidates->size());
|
---|
| 861 |
|
---|
| 862 | SortableEntryContainer::reverse_iterator rcit =
|
---|
| 863 | mSubdivisionCandidates->rbegin(), rcit_end = mSubdivisionCandidates->rend();
|
---|
[1379] | 864 |
|
---|
[1662] | 865 | vector<float>::reverse_iterator rbit = bordersRight.rbegin();
|
---|
[1323] | 866 |
|
---|
[1662] | 867 | for (; rcit != rcit_end; ++ rcit, ++ rbit)
|
---|
| 868 | {
|
---|
| 869 | Intersectable *obj = (*rcit).mObject;
|
---|
| 870 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
[1323] | 871 |
|
---|
[1662] | 872 | if (obox.Min(axis) < minBorder)
|
---|
| 873 | {
|
---|
| 874 | minBorder = obox.Min(axis);
|
---|
| 875 | }
|
---|
| 876 |
|
---|
| 877 | (*rbit) = minBorder;
|
---|
[1379] | 878 | }
|
---|
[1323] | 879 | }
|
---|
| 880 |
|
---|
[1662] | 881 | // temporary surface areas
|
---|
| 882 | float al = 0;
|
---|
| 883 | float ar = boxArea;
|
---|
| 884 |
|
---|
[1323] | 885 | vector<float>::const_iterator bit = bordersRight.begin();
|
---|
[1357] | 886 | SortableEntryContainer::const_iterator cit, cit_end = mSubdivisionCandidates->end();
|
---|
[1379] | 887 |
|
---|
[1323] | 888 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit, ++ bit)
|
---|
| 889 | {
|
---|
| 890 | Intersectable *obj = (*cit).mObject;
|
---|
| 891 |
|
---|
[1698] | 892 | const float renderCost = mViewCellsManager->EvalRenderCost(obj);
|
---|
| 893 | //const int renderCost = 1;
|
---|
[1323] | 894 |
|
---|
[1698] | 895 | objectsLeft += renderCost;
|
---|
| 896 | objectsRight -= renderCost;
|
---|
| 897 |
|
---|
[1323] | 898 | const AxisAlignedBox3 obox = obj->GetBox();
|
---|
| 899 |
|
---|
[1662] | 900 | if (mUseBboxAreaForSah)
|
---|
[1379] | 901 | {
|
---|
[1662] | 902 | AxisAlignedBox3 lbox = nodeBbox;
|
---|
| 903 | AxisAlignedBox3 rbox = nodeBbox;
|
---|
| 904 |
|
---|
| 905 | // the borders of the bounding boxes have changed
|
---|
| 906 | if (obox.Max(axis) > maxBorder)
|
---|
| 907 | {
|
---|
| 908 | maxBorder = obox.Max(axis);
|
---|
| 909 | }
|
---|
[1323] | 910 |
|
---|
[1662] | 911 | minBorder = (*bit);
|
---|
| 912 |
|
---|
| 913 | lbox.SetMax(axis, maxBorder);
|
---|
| 914 | rbox.SetMin(axis, minBorder);
|
---|
[1379] | 915 |
|
---|
[1662] | 916 | al = lbox.SurfaceArea();
|
---|
| 917 | ar = rbox.SurfaceArea();
|
---|
| 918 | }
|
---|
| 919 | else
|
---|
| 920 | {
|
---|
[1686] | 921 | // just add up areas of the objects itself
|
---|
[1662] | 922 | // (as we are not sampling volumetric visibility,
|
---|
| 923 | // this should provide better heuristics
|
---|
[1687] | 924 | const float area = obj->GetArea();//obox.SurfaceArea();
|
---|
[1379] | 925 |
|
---|
[1662] | 926 | al += area;
|
---|
| 927 | ar -= area;
|
---|
| 928 | }
|
---|
| 929 |
|
---|
[1705] | 930 | const bool noValidSplit = ((objectsLeft <= Limits::Small) || (objectsRight <= Limits::Small));
|
---|
| 931 |
|
---|
| 932 | const float sum = noValidSplit ? 1e25 : objectsLeft * al + objectsRight * ar;
|
---|
[1323] | 933 |
|
---|
[1379] | 934 | /*cout << "pos=" << (*cit).mPos << "\t q=(" << objectsLeft << "," << objectsRight <<")\t r=("
|
---|
[1370] | 935 | << lbox.SurfaceArea() << "," << rbox.SurfaceArea() << ")" << endl;
|
---|
[1379] | 936 | cout << "minborder: " << minBorder << " maxborder: " << maxBorder << endl;
|
---|
[1370] | 937 | cout << "cost= " << sum << endl;
|
---|
[1379] | 938 | */
|
---|
[1705] | 939 |
|
---|
[1323] | 940 | if (sum < minSum)
|
---|
[1705] | 941 | { //cout <<" sum: " << sum;
|
---|
[1379] | 942 | minSum = sum;
|
---|
| 943 | areaLeft = al;
|
---|
| 944 | areaRight = ar;
|
---|
[1698] | 945 |
|
---|
[1370] | 946 | // objects belong to left side now
|
---|
[1323] | 947 | for (; currentPos != (cit + 1); ++ currentPos);
|
---|
| 948 | }
|
---|
| 949 | }
|
---|
| 950 |
|
---|
[1370] | 951 | ////////////////////////////////////////////
|
---|
[1323] | 952 | //-- assign object to front and back volume
|
---|
| 953 |
|
---|
| 954 | // belongs to back bv
|
---|
| 955 | for (cit = mSubdivisionCandidates->begin(); cit != currentPos; ++ cit)
|
---|
| 956 | objectsBack.push_back((*cit).mObject);
|
---|
| 957 |
|
---|
| 958 | // belongs to front bv
|
---|
| 959 | for (cit = currentPos; cit != cit_end; ++ cit)
|
---|
| 960 | objectsFront.push_back((*cit).mObject);
|
---|
| 961 |
|
---|
| 962 | float newCost = minSum / boxArea;
|
---|
[1698] | 963 | float ratio = newCost / totalRenderCost;
|
---|
[1323] | 964 |
|
---|
[1379] | 965 | #ifdef _DEBUG
|
---|
[1705] | 966 | // if (objectsBack.empty() ||objectsFront.empty())
|
---|
[1414] | 967 | cout << "\n\nobjects=(" << (int)objectsBack.size() << "," << (int)objectsFront.size() << " of "
|
---|
| 968 | << (int)tData.mNode->mObjects.size() << ")\t area=("
|
---|
[1705] | 969 | << areaLeft << ", " << areaRight << ", " << boxArea << ")" << endl
|
---|
| 970 | << "cost= " << newCost << " oldCost=" << totalRenderCost / boxArea << endl;
|
---|
[1323] | 971 | #endif
|
---|
[1664] | 972 |
|
---|
[1323] | 973 | return ratio;
|
---|
| 974 | }
|
---|
| 975 |
|
---|
| 976 |
|
---|
| 977 | static bool PrepareOutput(const int axis,
|
---|
| 978 | const int leaves,
|
---|
| 979 | ofstream &sumStats,
|
---|
| 980 | ofstream &vollStats,
|
---|
| 981 | ofstream &volrStats)
|
---|
| 982 | {
|
---|
| 983 | if ((axis == 0) && (leaves > 0) && (leaves < 90))
|
---|
| 984 | {
|
---|
| 985 | char str[64];
|
---|
| 986 | sprintf(str, "tmp/bvh_heur_sum-%04d.log", leaves);
|
---|
| 987 | sumStats.open(str);
|
---|
| 988 | sprintf(str, "tmp/bvh_heur_voll-%04d.log", leaves);
|
---|
| 989 | vollStats.open(str);
|
---|
| 990 | sprintf(str, "tmp/bvh_heur_volr-%04d.log", leaves);
|
---|
| 991 | volrStats.open(str);
|
---|
| 992 | }
|
---|
| 993 |
|
---|
| 994 | return sumStats.is_open() && vollStats.is_open() && volrStats.is_open();
|
---|
| 995 | }
|
---|
| 996 |
|
---|
| 997 |
|
---|
| 998 | static void PrintHeuristics(const int objectsRight,
|
---|
| 999 | const float sum,
|
---|
| 1000 | const float volLeft,
|
---|
| 1001 | const float volRight,
|
---|
| 1002 | const float viewSpaceVol,
|
---|
| 1003 | ofstream &sumStats,
|
---|
| 1004 | ofstream &vollStats,
|
---|
| 1005 | ofstream &volrStats)
|
---|
| 1006 | {
|
---|
| 1007 | sumStats
|
---|
| 1008 | << "#Position\n" << objectsRight << endl
|
---|
| 1009 | << "#Sum\n" << sum / viewSpaceVol << endl
|
---|
| 1010 | << "#Vol\n" << (volLeft + volRight) / viewSpaceVol << endl;
|
---|
| 1011 |
|
---|
| 1012 | vollStats
|
---|
| 1013 | << "#Position\n" << objectsRight << endl
|
---|
| 1014 | << "#Vol\n" << volLeft / viewSpaceVol << endl;
|
---|
| 1015 |
|
---|
| 1016 | volrStats
|
---|
| 1017 | << "#Position\n" << objectsRight << endl
|
---|
| 1018 | << "#Vol\n" << volRight / viewSpaceVol << endl;
|
---|
| 1019 | }
|
---|
| 1020 |
|
---|
| 1021 |
|
---|
[1287] | 1022 | float BvHierarchy::EvalLocalCostHeuristics(const BvhTraversalData &tData,
|
---|
| 1023 | const int axis,
|
---|
| 1024 | ObjectContainer &objectsFront,
|
---|
| 1025 | ObjectContainer &objectsBack)
|
---|
| 1026 | {
|
---|
[1698] | 1027 | ///////////////////////////////////////////////////////
|
---|
| 1028 | // -- go through the lists, count the number of objects left
|
---|
| 1029 | //-- and right and evaluate the cost funcion
|
---|
[1237] | 1030 |
|
---|
[1357] | 1031 | // prepare the heuristics by setting mailboxes and counters.
|
---|
| 1032 | const float totalVol = PrepareHeuristics(tData, axis);
|
---|
| 1033 |
|
---|
[1287] | 1034 | // local helper variables
|
---|
| 1035 | float volLeft = 0;
|
---|
| 1036 | float volRight = totalVol;
|
---|
[1698] | 1037 |
|
---|
| 1038 | const float nTotalObjects = EvalAbsCost(tData.mNode->mObjects);
|
---|
| 1039 | float nObjectsLeft = 0;
|
---|
| 1040 | float nObjectsRight = nTotalObjects;
|
---|
| 1041 |
|
---|
[1563] | 1042 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
[1237] | 1043 |
|
---|
[1624] | 1044 | SortableEntryContainer::const_iterator backObjectsStart =
|
---|
| 1045 | mSubdivisionCandidates->begin();
|
---|
[1287] | 1046 |
|
---|
[1237] | 1047 | /////////////////////////////////
|
---|
[1357] | 1048 | //-- the parameters for the current optimum
|
---|
[1237] | 1049 |
|
---|
[1287] | 1050 | float volBack = volLeft;
|
---|
| 1051 | float volFront = volRight;
|
---|
| 1052 | float newRenderCost = nTotalObjects * totalVol;
|
---|
[1237] | 1053 |
|
---|
[1314] | 1054 | #ifdef _DEBUG
|
---|
| 1055 | ofstream sumStats;
|
---|
| 1056 | ofstream vollStats;
|
---|
| 1057 | ofstream volrStats;
|
---|
[1237] | 1058 |
|
---|
[1323] | 1059 | const bool printStats =
|
---|
| 1060 | PrepareOutput(axis, mBvhStats.Leaves(), sumStats, vollStats, volrStats);
|
---|
[1314] | 1061 | #endif
|
---|
| 1062 |
|
---|
[1357] | 1063 | ///////////////////////////////////////////////////
|
---|
| 1064 | //-- the sweep heuristics
|
---|
[1237] | 1065 | //-- traverse through events and find best split plane
|
---|
| 1066 |
|
---|
[1698] | 1067 | SortableEntryContainer::const_iterator cit,
|
---|
| 1068 | cit_end = cit_end = mSubdivisionCandidates->end();
|
---|
[1287] | 1069 |
|
---|
| 1070 | for (cit = mSubdivisionCandidates->begin(); cit != cit_end; ++ cit)
|
---|
[1237] | 1071 | {
|
---|
[1287] | 1072 | Intersectable *object = (*cit).mObject;
|
---|
[1370] | 1073 |
|
---|
[1287] | 1074 | // evaluate change in l and r volume
|
---|
| 1075 | // voll = view cells that see only left node (i.e., left pvs)
|
---|
| 1076 | // volr = view cells that see only right node (i.e., right pvs)
|
---|
| 1077 | EvalHeuristicsContribution(object, volLeft, volRight);
|
---|
[1237] | 1078 |
|
---|
[1698] | 1079 | const float rc = mViewCellsManager->EvalRenderCost(object);
|
---|
[1237] | 1080 |
|
---|
[1698] | 1081 | nObjectsLeft += rc;
|
---|
| 1082 | nObjectsRight -= rc;
|
---|
| 1083 |
|
---|
[1705] | 1084 | const bool noValidSplit = ((nObjectsLeft <= Limits::Small) || (nObjectsRight <= Limits::Small));
|
---|
| 1085 |
|
---|
[1287] | 1086 | // the heuristics
|
---|
[1705] | 1087 | const float sum = noValidSplit ?
|
---|
| 1088 | 1e25 : volLeft * (float)nObjectsLeft + volRight * (float)nObjectsRight;
|
---|
[1287] | 1089 |
|
---|
[1314] | 1090 | #ifdef _DEBUG
|
---|
| 1091 | if (printStats)
|
---|
[1357] | 1092 | {
|
---|
[1323] | 1093 | PrintHeuristics(nObjectsRight, sum, volLeft, volRight, viewSpaceVol,
|
---|
| 1094 | sumStats, vollStats, volrStats);
|
---|
[1357] | 1095 | }
|
---|
[1314] | 1096 | #endif
|
---|
| 1097 |
|
---|
[1287] | 1098 | if (sum < newRenderCost)
|
---|
[1237] | 1099 | {
|
---|
[1287] | 1100 | newRenderCost = sum;
|
---|
[1237] | 1101 |
|
---|
[1287] | 1102 | volBack = volLeft;
|
---|
| 1103 | volFront = volRight;
|
---|
[1237] | 1104 |
|
---|
[1287] | 1105 | // objects belongs to left side now
|
---|
[1357] | 1106 | for (; backObjectsStart != (cit + 1); ++ backObjectsStart);
|
---|
[1237] | 1107 | }
|
---|
| 1108 | }
|
---|
| 1109 |
|
---|
[1357] | 1110 | ////////////////////////////////////////////
|
---|
[1287] | 1111 | //-- assign object to front and back volume
|
---|
[1237] | 1112 |
|
---|
[1287] | 1113 | // belongs to back bv
|
---|
[1357] | 1114 | for (cit = mSubdivisionCandidates->begin(); cit != backObjectsStart; ++ cit)
|
---|
| 1115 | {
|
---|
[1287] | 1116 | objectsBack.push_back((*cit).mObject);
|
---|
[1357] | 1117 | }
|
---|
[1287] | 1118 | // belongs to front bv
|
---|
[1357] | 1119 | for (cit = backObjectsStart; cit != cit_end; ++ cit)
|
---|
| 1120 | {
|
---|
[1287] | 1121 | objectsFront.push_back((*cit).mObject);
|
---|
[1357] | 1122 | }
|
---|
[1237] | 1123 |
|
---|
[1357] | 1124 | // render cost of the old parent
|
---|
[1287] | 1125 | const float oldRenderCost = (float)nTotalObjects * totalVol + Limits::Small;
|
---|
| 1126 | // the relative cost ratio
|
---|
| 1127 | const float ratio = newRenderCost / oldRenderCost;
|
---|
| 1128 |
|
---|
[1654] | 1129 | #ifdef _DEBUG
|
---|
[1522] | 1130 | Debug << "\n§§§§ bvh eval const decrease §§§§" << endl
|
---|
[1703] | 1131 | << "back pvs: " << (int)objectsBack.size() << " front pvs: "
|
---|
| 1132 | << (int)objectsFront.size() << " total pvs: " << nTotalObjects << endl
|
---|
| 1133 | << "back p: " << volBack / viewSpaceVol << " front p "
|
---|
| 1134 | << volFront / viewSpaceVol << " p: " << totalVol / viewSpaceVol << endl
|
---|
| 1135 | << "old rc: " << oldRenderCost / viewSpaceVol << " new rc: "
|
---|
| 1136 | << newRenderCost / viewSpaceVol << endl
|
---|
| 1137 | << "render cost decrease: "
|
---|
| 1138 | << oldRenderCost / viewSpaceVol - newRenderCost / viewSpaceVol << endl;
|
---|
[1654] | 1139 | #endif
|
---|
[1237] | 1140 |
|
---|
| 1141 | return ratio;
|
---|
| 1142 | }
|
---|
| 1143 |
|
---|
| 1144 |
|
---|
[1357] | 1145 | void BvHierarchy::PrepareLocalSubdivisionCandidates(const BvhTraversalData &tData,
|
---|
| 1146 | const int axis)
|
---|
[1237] | 1147 | {
|
---|
[1357] | 1148 | //-- insert object queries
|
---|
[1692] | 1149 | ObjectContainer *objects = mUseGlobalSorting ?
|
---|
| 1150 | tData.mSortedObjects[axis] : &tData.mNode->mObjects;
|
---|
[1357] | 1151 |
|
---|
[1370] | 1152 | CreateLocalSubdivisionCandidates(*objects, &mSubdivisionCandidates, !mUseGlobalSorting, axis);
|
---|
[1357] | 1153 | }
|
---|
| 1154 |
|
---|
| 1155 |
|
---|
| 1156 | void BvHierarchy::CreateLocalSubdivisionCandidates(const ObjectContainer &objects,
|
---|
| 1157 | SortableEntryContainer **subdivisionCandidates,
|
---|
| 1158 | const bool sort,
|
---|
| 1159 | const int axis)
|
---|
| 1160 | {
|
---|
[1345] | 1161 | (*subdivisionCandidates)->clear();
|
---|
[1237] | 1162 |
|
---|
[1357] | 1163 | // compute requested size and look if subdivision candidate has to be recomputed
|
---|
[1345] | 1164 | const int requestedSize = (int)objects.size() * 2;
|
---|
[1237] | 1165 |
|
---|
| 1166 | // creates a sorted split candidates array
|
---|
[1345] | 1167 | if ((*subdivisionCandidates)->capacity() > 500000 &&
|
---|
| 1168 | requestedSize < (int)((*subdivisionCandidates)->capacity() / 10) )
|
---|
[1237] | 1169 | {
|
---|
[1357] | 1170 | delete (*subdivisionCandidates);
|
---|
| 1171 | (*subdivisionCandidates) = new SortableEntryContainer;
|
---|
[1237] | 1172 | }
|
---|
| 1173 |
|
---|
[1345] | 1174 | (*subdivisionCandidates)->reserve(requestedSize);
|
---|
[1237] | 1175 |
|
---|
[1345] | 1176 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
[1287] | 1177 |
|
---|
[1345] | 1178 | for (oit = objects.begin(); oit < oit_end; ++ oit)
|
---|
[1237] | 1179 | {
|
---|
| 1180 | Intersectable *object = *oit;
|
---|
[1287] | 1181 | const AxisAlignedBox3 &box = object->GetBox();
|
---|
| 1182 | const float midPt = (box.Min(axis) + box.Max(axis)) * 0.5f;
|
---|
[1237] | 1183 |
|
---|
[1345] | 1184 | (*subdivisionCandidates)->push_back(SortableEntry(object, midPt));
|
---|
[1237] | 1185 | }
|
---|
| 1186 |
|
---|
[1357] | 1187 | if (sort)
|
---|
[1580] | 1188 | { // no presorted candidate list
|
---|
[1357] | 1189 | stable_sort((*subdivisionCandidates)->begin(), (*subdivisionCandidates)->end());
|
---|
| 1190 | }
|
---|
[1237] | 1191 | }
|
---|
| 1192 |
|
---|
| 1193 |
|
---|
| 1194 | const BvhStatistics &BvHierarchy::GetStatistics() const
|
---|
| 1195 | {
|
---|
| 1196 | return mBvhStats;
|
---|
| 1197 | }
|
---|
| 1198 |
|
---|
| 1199 |
|
---|
[1287] | 1200 | float BvHierarchy::PrepareHeuristics(const BvhTraversalData &tData, const int axis)
|
---|
| 1201 | {
|
---|
[1323] | 1202 | BvhLeaf *leaf = tData.mNode;
|
---|
| 1203 | float vol = 0;
|
---|
| 1204 |
|
---|
[1357] | 1205 | // sort so we can use a sweep from right to left
|
---|
| 1206 | PrepareLocalSubdivisionCandidates(tData, axis);
|
---|
| 1207 |
|
---|
[1287] | 1208 | // collect and mark the view cells as belonging to front pvs
|
---|
| 1209 | ViewCellContainer viewCells;
|
---|
| 1210 | CollectViewCells(tData.mNode->mObjects, viewCells, true);
|
---|
[1323] | 1211 |
|
---|
| 1212 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
[1287] | 1213 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
| 1214 | {
|
---|
[1662] | 1215 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
| 1216 | const float volIncr = (*vit)->GetVolume();
|
---|
| 1217 | #else
|
---|
| 1218 | const float volIncr = 1.0f;
|
---|
| 1219 | #endif
|
---|
| 1220 | vol += volIncr;
|
---|
[1287] | 1221 | }
|
---|
| 1222 |
|
---|
[1370] | 1223 | // we will mail view cells switching to the back side
|
---|
[1287] | 1224 | ViewCell::NewMail();
|
---|
[1323] | 1225 |
|
---|
[1287] | 1226 | return vol;
|
---|
| 1227 | }
|
---|
[1576] | 1228 |
|
---|
[1287] | 1229 | ///////////////////////////////////////////////////////////
|
---|
| 1230 |
|
---|
| 1231 |
|
---|
| 1232 | void BvHierarchy::EvalHeuristicsContribution(Intersectable *obj,
|
---|
| 1233 | float &volLeft,
|
---|
| 1234 | float &volRight)
|
---|
[1237] | 1235 | {
|
---|
[1287] | 1236 | // collect all view cells associated with this objects
|
---|
| 1237 | // (also multiple times, if they are pierced by several rays)
|
---|
[1237] | 1238 | ViewCellContainer viewCells;
|
---|
[1287] | 1239 | const bool useMailboxing = false;
|
---|
[1323] | 1240 |
|
---|
[1287] | 1241 | CollectViewCells(obj, viewCells, useMailboxing);
|
---|
[1237] | 1242 |
|
---|
[1357] | 1243 | // classify view cells and compute volume contri accordingly
|
---|
| 1244 | // possible view cell classifications:
|
---|
| 1245 | // view cell mailed => view cell can be seen from left child node
|
---|
| 1246 | // view cell counter > 0 view cell can be seen from right child node
|
---|
| 1247 | // combined: view cell volume belongs to both nodes
|
---|
[1237] | 1248 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
| 1249 |
|
---|
| 1250 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
| 1251 | {
|
---|
| 1252 | // view cells can also be seen from left child node
|
---|
| 1253 | ViewCell *viewCell = *vit;
|
---|
[1662] | 1254 | #if USE_VOLUMES_FOR_HEURISTICS
|
---|
[1237] | 1255 | const float vol = viewCell->GetVolume();
|
---|
[1662] | 1256 | #else
|
---|
| 1257 | const float vol = 1.0f;
|
---|
| 1258 | #endif
|
---|
[1237] | 1259 | if (!viewCell->Mailed())
|
---|
| 1260 | {
|
---|
| 1261 | viewCell->Mail();
|
---|
| 1262 | // we now see view cell from both nodes
|
---|
[1287] | 1263 | // => add volume to left node
|
---|
| 1264 | volLeft += vol;
|
---|
[1237] | 1265 | }
|
---|
| 1266 |
|
---|
| 1267 | // last reference into the right node
|
---|
| 1268 | if (-- viewCell->mCounter == 0)
|
---|
[1357] | 1269 | {
|
---|
[1237] | 1270 | // view cell was previously seen from both nodes =>
|
---|
[1287] | 1271 | // remove volume from right node
|
---|
| 1272 | volRight -= vol;
|
---|
[1237] | 1273 | }
|
---|
| 1274 | }
|
---|
| 1275 | }
|
---|
| 1276 |
|
---|
| 1277 |
|
---|
| 1278 | void BvHierarchy::SetViewCellsManager(ViewCellsManager *vcm)
|
---|
| 1279 | {
|
---|
| 1280 | mViewCellsManager = vcm;
|
---|
| 1281 | }
|
---|
| 1282 |
|
---|
| 1283 |
|
---|
| 1284 | AxisAlignedBox3 BvHierarchy::GetBoundingBox() const
|
---|
| 1285 | {
|
---|
| 1286 | return mBoundingBox;
|
---|
| 1287 | }
|
---|
| 1288 |
|
---|
| 1289 |
|
---|
| 1290 | float BvHierarchy::SelectObjectPartition(const BvhTraversalData &tData,
|
---|
| 1291 | ObjectContainer &frontObjects,
|
---|
[1676] | 1292 | ObjectContainer &backObjects,
|
---|
| 1293 | bool useVisibilityBasedHeuristics)
|
---|
[1237] | 1294 | {
|
---|
| 1295 | ObjectContainer nFrontObjects[3];
|
---|
| 1296 | ObjectContainer nBackObjects[3];
|
---|
| 1297 | float nCostRatio[3];
|
---|
| 1298 |
|
---|
| 1299 | int sAxis = 0;
|
---|
| 1300 | int bestAxis = -1;
|
---|
| 1301 |
|
---|
| 1302 | if (mOnlyDrivingAxis)
|
---|
| 1303 | {
|
---|
[1370] | 1304 | const AxisAlignedBox3 box = tData.mNode->GetBoundingBox();
|
---|
[1237] | 1305 | sAxis = box.Size().DrivingAxis();
|
---|
| 1306 | }
|
---|
| 1307 |
|
---|
[1580] | 1308 | ////////////////////////////////////
|
---|
[1357] | 1309 | //-- evaluate split cost for all three axis
|
---|
[1237] | 1310 |
|
---|
| 1311 | for (int axis = 0; axis < 3; ++ axis)
|
---|
| 1312 | {
|
---|
| 1313 | if (!mOnlyDrivingAxis || (axis == sAxis))
|
---|
| 1314 | {
|
---|
[1287] | 1315 | if (mUseCostHeuristics)
|
---|
[1298] | 1316 | {
|
---|
[1370] | 1317 | //////////////////////////////////
|
---|
| 1318 | //-- split objects using heuristics
|
---|
| 1319 |
|
---|
[1676] | 1320 | if (useVisibilityBasedHeuristics)
|
---|
[1370] | 1321 | {
|
---|
[1684] | 1322 | //cout << "v rays: " << tData.mNumRays << " " << endl;
|
---|
[1634] | 1323 | ///////////
|
---|
[1370] | 1324 | //-- heuristics using objects weighted by view cells volume
|
---|
| 1325 | nCostRatio[axis] =
|
---|
[1703] | 1326 | EvalLocalCostHeuristics(tData,
|
---|
| 1327 | axis,
|
---|
| 1328 | nFrontObjects[axis],
|
---|
| 1329 | nBackObjects[axis]);
|
---|
[1370] | 1330 | }
|
---|
| 1331 | else
|
---|
[1692] | 1332 | { //cout << "e rays: " << tData.mNumRays << " ";
|
---|
[1580] | 1333 | //////////////////
|
---|
| 1334 | //-- view cells not constructed yet => use surface area heuristic
|
---|
[1703] | 1335 | nCostRatio[axis] = EvalSah(tData,
|
---|
| 1336 | axis,
|
---|
| 1337 | nFrontObjects[axis],
|
---|
| 1338 | nBackObjects[axis]);
|
---|
[1370] | 1339 | }
|
---|
[1237] | 1340 | }
|
---|
[1287] | 1341 | else
|
---|
[1298] | 1342 | {
|
---|
[1370] | 1343 | //-- split objects using some simple criteria
|
---|
[1287] | 1344 | nCostRatio[axis] =
|
---|
[1679] | 1345 | EvalLocalObjectPartition(tData, axis, nFrontObjects[axis], nBackObjects[axis]);
|
---|
[1287] | 1346 | }
|
---|
| 1347 |
|
---|
[1703] | 1348 | if ((bestAxis == -1) || (nCostRatio[axis] < nCostRatio[bestAxis]))
|
---|
[1237] | 1349 | {
|
---|
| 1350 | bestAxis = axis;
|
---|
| 1351 | }
|
---|
| 1352 | }
|
---|
| 1353 | }
|
---|
| 1354 |
|
---|
[1580] | 1355 | ////////////////
|
---|
[1237] | 1356 | //-- assign values
|
---|
[1287] | 1357 |
|
---|
[1237] | 1358 | frontObjects = nFrontObjects[bestAxis];
|
---|
[1287] | 1359 | backObjects = nBackObjects[bestAxis];
|
---|
[1237] | 1360 |
|
---|
[1703] | 1361 | //cout << "val: " << nCostRatio[bestAxis] << " axis: " << bestAxis << endl;
|
---|
[1237] | 1362 | return nCostRatio[bestAxis];
|
---|
| 1363 | }
|
---|
| 1364 |
|
---|
| 1365 |
|
---|
[1370] | 1366 | int BvHierarchy::AssociateObjectsWithRays(const VssRayContainer &rays) const
|
---|
[1237] | 1367 | {
|
---|
[1370] | 1368 | int nRays = 0;
|
---|
[1237] | 1369 | VssRayContainer::const_iterator rit, rit_end = rays.end();
|
---|
| 1370 |
|
---|
[1370] | 1371 | VssRay::NewMail();
|
---|
| 1372 |
|
---|
[1237] | 1373 | for (rit = rays.begin(); rit != rays.end(); ++ rit)
|
---|
| 1374 | {
|
---|
| 1375 | VssRay *ray = (*rit);
|
---|
| 1376 |
|
---|
| 1377 | if (ray->mTerminationObject)
|
---|
| 1378 | {
|
---|
[1696] | 1379 | ray->mTerminationObject->GetOrCreateRays()->push_back(ray);
|
---|
[1370] | 1380 | if (!ray->Mailed())
|
---|
| 1381 | {
|
---|
| 1382 | ray->Mail();
|
---|
| 1383 | ++ nRays;
|
---|
| 1384 | }
|
---|
[1237] | 1385 | }
|
---|
[1649] | 1386 | #if COUNT_ORIGIN_OBJECTS
|
---|
| 1387 | if (ray->mOriginObject)
|
---|
[1237] | 1388 | {
|
---|
[1696] | 1389 | ray->mOriginObject->GetOrCreateRays()->push_back(ray);
|
---|
[1370] | 1390 |
|
---|
| 1391 | if (!ray->Mailed())
|
---|
| 1392 | {
|
---|
| 1393 | ray->Mail();
|
---|
| 1394 | ++ nRays;
|
---|
| 1395 | }
|
---|
[1237] | 1396 | }
|
---|
[1649] | 1397 | #endif
|
---|
[1237] | 1398 | }
|
---|
[1370] | 1399 |
|
---|
| 1400 | return nRays;
|
---|
[1237] | 1401 | }
|
---|
| 1402 |
|
---|
| 1403 |
|
---|
[1287] | 1404 | void BvHierarchy::PrintSubdivisionStats(const SubdivisionCandidate &sc)
|
---|
[1237] | 1405 | {
|
---|
[1709] | 1406 | const float costDecr = sc.GetRenderCostDecrease();
|
---|
[1237] | 1407 |
|
---|
| 1408 | mSubdivisionStats
|
---|
[1421] | 1409 | << "#Leaves\n" << mBvhStats.Leaves() << endl
|
---|
[1287] | 1410 | << "#RenderCostDecrease\n" << costDecr << endl
|
---|
[1662] | 1411 | << "#TotalRenderCost\n" << mTotalCost << endl
|
---|
| 1412 | << "#EntriesInPvs\n" << mPvsEntries << endl;
|
---|
[1237] | 1413 | }
|
---|
| 1414 |
|
---|
| 1415 |
|
---|
| 1416 | void BvHierarchy::CollectRays(const ObjectContainer &objects,
|
---|
| 1417 | VssRayContainer &rays) const
|
---|
| 1418 | {
|
---|
| 1419 | VssRay::NewMail();
|
---|
| 1420 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
| 1421 |
|
---|
| 1422 | // evaluate reverse pvs and view cell volume on left and right cell
|
---|
| 1423 | // note: should I take all leaf objects or rather the objects hit by rays?
|
---|
| 1424 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
| 1425 | {
|
---|
| 1426 | Intersectable *obj = *oit;
|
---|
[1696] | 1427 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
[1237] | 1428 |
|
---|
[1696] | 1429 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
[1237] | 1430 | {
|
---|
| 1431 | VssRay *ray = (*rit);
|
---|
| 1432 |
|
---|
| 1433 | if (!ray->Mailed())
|
---|
| 1434 | {
|
---|
| 1435 | ray->Mail();
|
---|
| 1436 | rays.push_back(ray);
|
---|
| 1437 | }
|
---|
| 1438 | }
|
---|
| 1439 | }
|
---|
| 1440 | }
|
---|
| 1441 |
|
---|
| 1442 |
|
---|
[1703] | 1443 | float BvHierarchy::EvalAbsCost(const ObjectContainer &objects)// const
|
---|
[1698] | 1444 | {
|
---|
| 1445 | #if USE_BETTER_RENDERCOST_EST
|
---|
| 1446 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
| 1447 |
|
---|
| 1448 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
[1379] | 1449 | {
|
---|
[1703] | 1450 | objRenderCost += ViewCellsManager::GetRendercost(*oit);
|
---|
[1698] | 1451 | }
|
---|
| 1452 | #else
|
---|
| 1453 | return (float)objects.size();
|
---|
| 1454 | #endif
|
---|
| 1455 | }
|
---|
[1580] | 1456 |
|
---|
[1357] | 1457 |
|
---|
[1705] | 1458 | float BvHierarchy::EvalSahCost(BvhLeaf *leaf)
|
---|
| 1459 | {
|
---|
| 1460 | ////////////////
|
---|
| 1461 | //-- surface area heuristics
|
---|
| 1462 | if (leaf->mObjects.empty())
|
---|
| 1463 | return 0.0f;
|
---|
| 1464 |
|
---|
| 1465 | const AxisAlignedBox3 box = GetBoundingBox(leaf);
|
---|
| 1466 | const float area = box.SurfaceArea();
|
---|
| 1467 | const float viewSpaceArea = mViewCellsManager->GetViewSpaceBox().SurfaceArea();
|
---|
| 1468 |
|
---|
| 1469 | return EvalAbsCost(leaf->mObjects) * area / viewSpaceArea;
|
---|
| 1470 | }
|
---|
| 1471 |
|
---|
| 1472 |
|
---|
[1698] | 1473 | float BvHierarchy::EvalRenderCost(const ObjectContainer &objects) const
|
---|
| 1474 | {
|
---|
| 1475 | ///////////////
|
---|
| 1476 | //-- render cost heuristics
|
---|
[1379] | 1477 |
|
---|
[1698] | 1478 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
|
---|
[1379] | 1479 |
|
---|
[1698] | 1480 | // probability that view point lies in a view cell which sees this node
|
---|
| 1481 | const float p = EvalViewCellsVolume(objects) / viewSpaceVol;
|
---|
| 1482 | float objRenderCost = EvalAbsCost(objects);
|
---|
| 1483 |
|
---|
| 1484 | return objRenderCost * p;
|
---|
[1287] | 1485 | }
|
---|
| 1486 |
|
---|
| 1487 |
|
---|
[1405] | 1488 | AxisAlignedBox3 BvHierarchy::EvalBoundingBox(const ObjectContainer &objects,
|
---|
| 1489 | const AxisAlignedBox3 *parentBox) const
|
---|
[1237] | 1490 | {
|
---|
[1405] | 1491 | // if there are no objects in this box, box size is set to parent box size.
|
---|
| 1492 | // Question: Invalidate box instead?
|
---|
[1287] | 1493 | if (parentBox && objects.empty())
|
---|
| 1494 | return *parentBox;
|
---|
| 1495 |
|
---|
[1237] | 1496 | AxisAlignedBox3 box;
|
---|
| 1497 | box.Initialize();
|
---|
| 1498 |
|
---|
| 1499 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
| 1500 |
|
---|
| 1501 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
| 1502 | {
|
---|
| 1503 | Intersectable *obj = *oit;
|
---|
[1370] | 1504 | // grow bounding box to include all objects
|
---|
[1287] | 1505 | box.Include(obj->GetBox());
|
---|
[1237] | 1506 | }
|
---|
[1287] | 1507 |
|
---|
[1237] | 1508 | return box;
|
---|
| 1509 | }
|
---|
| 1510 |
|
---|
| 1511 |
|
---|
[1707] | 1512 | void BvHierarchy::CollectLeaves(BvhNode *root, vector<BvhLeaf *> &leaves) const
|
---|
[1237] | 1513 | {
|
---|
| 1514 | stack<BvhNode *> nodeStack;
|
---|
[1707] | 1515 | nodeStack.push(root);
|
---|
[1237] | 1516 |
|
---|
| 1517 | while (!nodeStack.empty())
|
---|
| 1518 | {
|
---|
| 1519 | BvhNode *node = nodeStack.top();
|
---|
| 1520 | nodeStack.pop();
|
---|
[1287] | 1521 |
|
---|
[1237] | 1522 | if (node->IsLeaf())
|
---|
| 1523 | {
|
---|
| 1524 | BvhLeaf *leaf = (BvhLeaf *)node;
|
---|
| 1525 | leaves.push_back(leaf);
|
---|
| 1526 | }
|
---|
| 1527 | else
|
---|
| 1528 | {
|
---|
| 1529 | BvhInterior *interior = (BvhInterior *)node;
|
---|
| 1530 |
|
---|
| 1531 | nodeStack.push(interior->GetBack());
|
---|
| 1532 | nodeStack.push(interior->GetFront());
|
---|
| 1533 | }
|
---|
| 1534 | }
|
---|
| 1535 | }
|
---|
| 1536 |
|
---|
| 1537 |
|
---|
| 1538 | AxisAlignedBox3 BvHierarchy::GetBoundingBox(BvhNode *node) const
|
---|
| 1539 | {
|
---|
| 1540 | return node->GetBoundingBox();
|
---|
| 1541 | }
|
---|
| 1542 |
|
---|
| 1543 |
|
---|
[1287] | 1544 | void BvHierarchy::CollectViewCells(const ObjectContainer &objects,
|
---|
| 1545 | ViewCellContainer &viewCells,
|
---|
| 1546 | const bool setCounter) const
|
---|
[1237] | 1547 | {
|
---|
[1379] | 1548 | // no view cells yet
|
---|
[1635] | 1549 | if (0 && mHierarchyManager->GetViewSpaceSubdivisionType() ==
|
---|
[1379] | 1550 | HierarchyManager::NO_VIEWSPACE_SUBDIV)
|
---|
| 1551 | return;
|
---|
| 1552 |
|
---|
[1237] | 1553 | ViewCell::NewMail();
|
---|
[1287] | 1554 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
[1237] | 1555 |
|
---|
| 1556 | // loop through all object and collect view cell pvs of this node
|
---|
[1287] | 1557 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
[1237] | 1558 | {
|
---|
[1287] | 1559 | CollectViewCells(*oit, viewCells, true, setCounter);
|
---|
[1237] | 1560 | }
|
---|
| 1561 | }
|
---|
| 1562 |
|
---|
| 1563 |
|
---|
[1287] | 1564 | void BvHierarchy::CollectViewCells(Intersectable *obj,
|
---|
| 1565 | ViewCellContainer &viewCells,
|
---|
| 1566 | const bool useMailBoxing,
|
---|
| 1567 | const bool setCounter) const
|
---|
[1237] | 1568 | {
|
---|
[1696] | 1569 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
[1237] | 1570 |
|
---|
[1696] | 1571 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
[1237] | 1572 | {
|
---|
| 1573 | VssRay *ray = (*rit);
|
---|
[1287] | 1574 | ViewCellContainer tmpViewCells;
|
---|
| 1575 |
|
---|
[1379] | 1576 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
[1237] | 1577 |
|
---|
[1640] | 1578 | // matt: probably slow to allocate memory for view cells every time
|
---|
[1237] | 1579 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
| 1580 |
|
---|
| 1581 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
| 1582 | {
|
---|
[1576] | 1583 | ViewCell *vc = *vit;
|
---|
[1237] | 1584 |
|
---|
[1287] | 1585 | // store view cells
|
---|
| 1586 | if (!useMailBoxing || !vc->Mailed())
|
---|
[1237] | 1587 | {
|
---|
[1287] | 1588 | if (useMailBoxing)
|
---|
| 1589 | {
|
---|
| 1590 | vc->Mail();
|
---|
| 1591 | if (setCounter)
|
---|
[1305] | 1592 | {
|
---|
[1287] | 1593 | vc->mCounter = 0;
|
---|
[1305] | 1594 | }
|
---|
[1287] | 1595 | }
|
---|
[1237] | 1596 | viewCells.push_back(vc);
|
---|
| 1597 | }
|
---|
[1287] | 1598 |
|
---|
| 1599 | if (setCounter)
|
---|
| 1600 | {
|
---|
| 1601 | ++ vc->mCounter;
|
---|
| 1602 | }
|
---|
[1237] | 1603 | }
|
---|
| 1604 | }
|
---|
[1287] | 1605 | }
|
---|
[1237] | 1606 |
|
---|
| 1607 |
|
---|
[1576] | 1608 | int BvHierarchy::CountViewCells(Intersectable *obj) const
|
---|
| 1609 | {
|
---|
| 1610 | int result = 0;
|
---|
| 1611 |
|
---|
[1696] | 1612 | VssRayContainer::const_iterator rit, rit_end = obj->GetOrCreateRays()->end();
|
---|
[1576] | 1613 |
|
---|
[1696] | 1614 | for (rit = obj->GetOrCreateRays()->begin(); rit < rit_end; ++ rit)
|
---|
[1576] | 1615 | {
|
---|
| 1616 | VssRay *ray = (*rit);
|
---|
| 1617 | ViewCellContainer tmpViewCells;
|
---|
| 1618 |
|
---|
| 1619 | mHierarchyManager->mVspTree->GetViewCells(*ray, tmpViewCells);
|
---|
| 1620 |
|
---|
| 1621 | ViewCellContainer::const_iterator vit, vit_end = tmpViewCells.end();
|
---|
| 1622 | for (vit = tmpViewCells.begin(); vit != vit_end; ++ vit)
|
---|
| 1623 | {
|
---|
| 1624 | ViewCell *vc = *vit;
|
---|
| 1625 |
|
---|
| 1626 | // store view cells
|
---|
| 1627 | if (!vc->Mailed())
|
---|
| 1628 | {
|
---|
| 1629 | vc->Mail();
|
---|
| 1630 | ++ result;
|
---|
| 1631 | }
|
---|
| 1632 | }
|
---|
| 1633 | }
|
---|
| 1634 |
|
---|
| 1635 | return result;
|
---|
| 1636 | }
|
---|
| 1637 |
|
---|
| 1638 |
|
---|
| 1639 | int BvHierarchy::CountViewCells(const ObjectContainer &objects) const
|
---|
| 1640 | {
|
---|
| 1641 | int nViewCells = 0;
|
---|
| 1642 | ViewCell::NewMail();
|
---|
| 1643 | ObjectContainer::const_iterator oit, oit_end = objects.end();
|
---|
| 1644 |
|
---|
| 1645 | // loop through all object and collect view cell pvs of this node
|
---|
| 1646 | for (oit = objects.begin(); oit != oit_end; ++ oit)
|
---|
| 1647 | {
|
---|
| 1648 | nViewCells += CountViewCells(*oit);
|
---|
| 1649 | }
|
---|
| 1650 |
|
---|
| 1651 | return nViewCells;
|
---|
| 1652 | }
|
---|
| 1653 |
|
---|
| 1654 |
|
---|
[1287] | 1655 | void BvHierarchy::CollectDirtyCandidates(BvhSubdivisionCandidate *sc,
|
---|
[1633] | 1656 | vector<SubdivisionCandidate *> &dirtyList,
|
---|
| 1657 | const bool onlyUnmailed)
|
---|
[1287] | 1658 | {
|
---|
| 1659 | BvhTraversalData &tData = sc->mParentData;
|
---|
| 1660 | BvhLeaf *node = tData.mNode;
|
---|
| 1661 |
|
---|
| 1662 | ViewCellContainer viewCells;
|
---|
[1633] | 1663 | ViewCell::NewMail();
|
---|
| 1664 | CollectViewCells(node->mObjects, viewCells, true);
|
---|
| 1665 |
|
---|
[1415] | 1666 | if (0) cout << "collected " << (int)viewCells.size() << " dirty candidates" << endl;
|
---|
[1633] | 1667 |
|
---|
[1287] | 1668 | // split candidates handling
|
---|
| 1669 | // these view cells are thrown into dirty list
|
---|
[1237] | 1670 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
| 1671 |
|
---|
| 1672 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
| 1673 | {
|
---|
[1633] | 1674 | VspViewCell *vc = dynamic_cast<VspViewCell *>(*vit);
|
---|
[1551] | 1675 | VspLeaf *leaf = vc->mLeaves[0];
|
---|
[1633] | 1676 |
|
---|
[1297] | 1677 | SubdivisionCandidate *candidate = leaf->GetSubdivisionCandidate();
|
---|
| 1678 |
|
---|
[1633] | 1679 | // is this leaf still a split candidate?
|
---|
| 1680 | if (candidate && (!onlyUnmailed || !candidate->Mailed()))
|
---|
[1305] | 1681 | {
|
---|
[1633] | 1682 | candidate->Mail();
|
---|
[1305] | 1683 | dirtyList.push_back(candidate);
|
---|
| 1684 | }
|
---|
[1237] | 1685 | }
|
---|
| 1686 | }
|
---|
| 1687 |
|
---|
| 1688 |
|
---|
| 1689 | BvhNode *BvHierarchy::GetRoot() const
|
---|
| 1690 | {
|
---|
| 1691 | return mRoot;
|
---|
| 1692 | }
|
---|
| 1693 |
|
---|
| 1694 |
|
---|
| 1695 | bool BvHierarchy::IsObjectInLeaf(BvhLeaf *leaf, Intersectable *object) const
|
---|
| 1696 | {
|
---|
| 1697 | ObjectContainer::const_iterator oit =
|
---|
| 1698 | lower_bound(leaf->mObjects.begin(), leaf->mObjects.end(), object, ilt);
|
---|
| 1699 |
|
---|
| 1700 | // objects sorted by id
|
---|
| 1701 | if ((oit != leaf->mObjects.end()) && ((*oit)->GetId() == object->GetId()))
|
---|
| 1702 | {
|
---|
| 1703 | return true;
|
---|
| 1704 | }
|
---|
| 1705 | else
|
---|
| 1706 | {
|
---|
| 1707 | return false;
|
---|
| 1708 | }
|
---|
| 1709 | }
|
---|
| 1710 |
|
---|
| 1711 |
|
---|
| 1712 | BvhLeaf *BvHierarchy::GetLeaf(Intersectable *object, BvhNode *node) const
|
---|
| 1713 | {
|
---|
| 1714 | // rather use the simple version
|
---|
[1680] | 1715 | if (!object)
|
---|
| 1716 | return NULL;
|
---|
| 1717 |
|
---|
[1297] | 1718 | return object->mBvhLeaf;
|
---|
| 1719 |
|
---|
[1237] | 1720 | ///////////////////////////////////////
|
---|
| 1721 | // start from root of tree
|
---|
[1297] | 1722 |
|
---|
[1237] | 1723 | if (node == NULL)
|
---|
| 1724 | node = mRoot;
|
---|
[1297] | 1725 |
|
---|
[1237] | 1726 | vector<BvhLeaf *> leaves;
|
---|
| 1727 |
|
---|
| 1728 | stack<BvhNode *> nodeStack;
|
---|
| 1729 | nodeStack.push(node);
|
---|
| 1730 |
|
---|
| 1731 | BvhLeaf *leaf = NULL;
|
---|
| 1732 |
|
---|
| 1733 | while (!nodeStack.empty())
|
---|
| 1734 | {
|
---|
| 1735 | BvhNode *node = nodeStack.top();
|
---|
| 1736 | nodeStack.pop();
|
---|
| 1737 |
|
---|
| 1738 | if (node->IsLeaf())
|
---|
| 1739 | {
|
---|
| 1740 | leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
| 1741 |
|
---|
| 1742 | if (IsObjectInLeaf(leaf, object))
|
---|
[1293] | 1743 | {
|
---|
[1237] | 1744 | return leaf;
|
---|
[1293] | 1745 | }
|
---|
[1237] | 1746 | }
|
---|
| 1747 | else
|
---|
| 1748 | {
|
---|
| 1749 | // find point
|
---|
| 1750 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
| 1751 |
|
---|
| 1752 | if (interior->GetBack()->GetBoundingBox().Includes(object->GetBox()))
|
---|
| 1753 | {
|
---|
| 1754 | nodeStack.push(interior->GetBack());
|
---|
| 1755 | }
|
---|
| 1756 |
|
---|
| 1757 | // search both sides as we are using bounding volumes
|
---|
| 1758 | if (interior->GetFront()->GetBoundingBox().Includes(object->GetBox()))
|
---|
| 1759 | {
|
---|
| 1760 | nodeStack.push(interior->GetFront());
|
---|
| 1761 | }
|
---|
| 1762 | }
|
---|
| 1763 | }
|
---|
| 1764 |
|
---|
| 1765 | return leaf;
|
---|
| 1766 | }
|
---|
| 1767 |
|
---|
| 1768 |
|
---|
[1707] | 1769 | BvhIntersectable *BvHierarchy::GetOrCreateBvhIntersectable(BvhLeaf *node)
|
---|
[1237] | 1770 | {
|
---|
| 1771 | // search nodes
|
---|
[1707] | 1772 | std::map<BvhLeaf *, BvhIntersectable *>::const_iterator
|
---|
[1698] | 1773 | it = mBvhIntersectables.find(node);
|
---|
[1237] | 1774 |
|
---|
| 1775 | if (it != mBvhIntersectables.end())
|
---|
| 1776 | {
|
---|
| 1777 | return (*it).second;
|
---|
| 1778 | }
|
---|
| 1779 |
|
---|
| 1780 | // not in map => create new entry
|
---|
| 1781 | BvhIntersectable *bvhObj = new BvhIntersectable(node);
|
---|
| 1782 | mBvhIntersectables[node] = bvhObj;
|
---|
| 1783 |
|
---|
| 1784 | return bvhObj;
|
---|
| 1785 | }
|
---|
| 1786 |
|
---|
| 1787 |
|
---|
| 1788 | bool BvHierarchy::Export(OUT_STREAM &stream)
|
---|
| 1789 | {
|
---|
| 1790 | ExportNode(mRoot, stream);
|
---|
| 1791 |
|
---|
| 1792 | return true;
|
---|
| 1793 | }
|
---|
| 1794 |
|
---|
| 1795 |
|
---|
[1286] | 1796 | void BvHierarchy::ExportObjects(BvhLeaf *leaf, OUT_STREAM &stream)
|
---|
| 1797 | {
|
---|
| 1798 | ObjectContainer::const_iterator oit, oit_end = leaf->mObjects.end();
|
---|
| 1799 | for (oit = leaf->mObjects.begin(); oit != oit_end; ++ oit)
|
---|
| 1800 | {
|
---|
| 1801 | stream << (*oit)->GetId() << " ";
|
---|
| 1802 | }
|
---|
| 1803 | }
|
---|
| 1804 |
|
---|
| 1805 |
|
---|
[1237] | 1806 | void BvHierarchy::ExportNode(BvhNode *node, OUT_STREAM &stream)
|
---|
| 1807 | {
|
---|
| 1808 | if (node->IsLeaf())
|
---|
| 1809 | {
|
---|
| 1810 | BvhLeaf *leaf = dynamic_cast<BvhLeaf *>(node);
|
---|
[1287] | 1811 | const AxisAlignedBox3 box = leaf->GetBoundingBox();
|
---|
[1286] | 1812 | stream << "<Leaf"
|
---|
[1287] | 1813 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
| 1814 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z << "\""
|
---|
[1286] | 1815 | << " objects=\"";
|
---|
[1237] | 1816 |
|
---|
[1286] | 1817 | //-- export objects
|
---|
| 1818 | ExportObjects(leaf, stream);
|
---|
[1237] | 1819 |
|
---|
| 1820 | stream << "\" />" << endl;
|
---|
| 1821 | }
|
---|
| 1822 | else
|
---|
| 1823 | {
|
---|
| 1824 | BvhInterior *interior = dynamic_cast<BvhInterior *>(node);
|
---|
[1287] | 1825 | const AxisAlignedBox3 box = interior->GetBoundingBox();
|
---|
| 1826 |
|
---|
[1286] | 1827 | stream << "<Interior"
|
---|
[1287] | 1828 | << " min=\"" << box.Min().x << " " << box.Min().y << " " << box.Min().z << "\""
|
---|
| 1829 | << " max=\"" << box.Max().x << " " << box.Max().y << " " << box.Max().z
|
---|
[1286] | 1830 | << "\">" << endl;
|
---|
[1237] | 1831 |
|
---|
| 1832 | ExportNode(interior->GetBack(), stream);
|
---|
| 1833 | ExportNode(interior->GetFront(), stream);
|
---|
| 1834 |
|
---|
| 1835 | stream << "</Interior>" << endl;
|
---|
| 1836 | }
|
---|
| 1837 | }
|
---|
| 1838 |
|
---|
| 1839 |
|
---|
[1287] | 1840 | float BvHierarchy::EvalViewCellsVolume(const ObjectContainer &objects) const
|
---|
[1237] | 1841 | {
|
---|
| 1842 | float vol = 0;
|
---|
| 1843 |
|
---|
[1287] | 1844 | ViewCellContainer viewCells;
|
---|
| 1845 | CollectViewCells(objects, viewCells);
|
---|
[1237] | 1846 |
|
---|
[1287] | 1847 | ViewCellContainer::const_iterator vit, vit_end = viewCells.end();
|
---|
[1237] | 1848 |
|
---|
[1287] | 1849 | for (vit = viewCells.begin(); vit != vit_end; ++ vit)
|
---|
[1237] | 1850 | {
|
---|
[1287] | 1851 | vol += (*vit)->GetVolume();
|
---|
[1237] | 1852 | }
|
---|
| 1853 |
|
---|
| 1854 | return vol;
|
---|
| 1855 | }
|
---|
| 1856 |
|
---|
[1357] | 1857 |
|
---|
[1640] | 1858 | void BvHierarchy::Initialise(const ObjectContainer &objects)
|
---|
[1294] | 1859 | {
|
---|
[1698] | 1860 | AxisAlignedBox3 box = EvalBoundingBox(objects);
|
---|
| 1861 |
|
---|
[1449] | 1862 | ///////
|
---|
[1294] | 1863 | //-- create new root
|
---|
[1449] | 1864 |
|
---|
[1294] | 1865 | BvhLeaf *bvhleaf = new BvhLeaf(box, NULL, (int)objects.size());
|
---|
| 1866 | bvhleaf->mObjects = objects;
|
---|
| 1867 | mRoot = bvhleaf;
|
---|
| 1868 |
|
---|
[1640] | 1869 | // compute bounding box from objects
|
---|
| 1870 | mBoundingBox = mRoot->GetBoundingBox();
|
---|
| 1871 |
|
---|
[1294] | 1872 | // associate root with current objects
|
---|
| 1873 | AssociateObjectsWithLeaf(bvhleaf);
|
---|
| 1874 | }
|
---|
| 1875 |
|
---|
[1640] | 1876 |
|
---|
[1404] | 1877 | /*
|
---|
| 1878 | Mesh *BvHierarchy::MergeLeafToMesh()
|
---|
| 1879 | {
|
---|
| 1880 | vector<BvhLeaf *> leaves;
|
---|
| 1881 | CollectLeaves(leaves);
|
---|
[1294] | 1882 |
|
---|
[1404] | 1883 | vector<BvhLeaf *>::const_iterator lit, lit_end = leaves.end();
|
---|
| 1884 |
|
---|
| 1885 | for (lit = leaves.begin(); lit != lit_end; ++ lit)
|
---|
| 1886 | {
|
---|
| 1887 | Mesh *mesh = MergeLeafToMesh(*lit);
|
---|
| 1888 | }
|
---|
| 1889 | }*/
|
---|
| 1890 |
|
---|
| 1891 |
|
---|
[1237] | 1892 | SubdivisionCandidate *BvHierarchy::PrepareConstruction(const VssRayContainer &sampleRays,
|
---|
[1294] | 1893 | const ObjectContainer &objects)
|
---|
[1237] | 1894 | {
|
---|
[1522] | 1895 | ///////////////////////////////////////
|
---|
| 1896 | //-- we assume that we have objects sorted by their id =>
|
---|
[1404] | 1897 | //-- we don't have to sort them here and an binary search
|
---|
| 1898 | //-- for identifying if a object is in a leaf.
|
---|
[1421] | 1899 |
|
---|
[1308] | 1900 | mBvhStats.Reset();
|
---|
| 1901 | mBvhStats.Start();
|
---|
| 1902 | mBvhStats.nodes = 1;
|
---|
[1522] | 1903 |
|
---|
[1237] | 1904 | // store pointer to this tree
|
---|
| 1905 | BvhSubdivisionCandidate::sBvHierarchy = this;
|
---|
[1421] | 1906 |
|
---|
[1640] | 1907 | // root and bounding box was already constructed
|
---|
[1548] | 1908 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
|
---|
[1237] | 1909 |
|
---|
[1370] | 1910 | // multiply termination criterium for comparison,
|
---|
| 1911 | // so it can be set between zero and one and
|
---|
| 1912 | // no division is necessary during traversal
|
---|
| 1913 |
|
---|
| 1914 | #if PROBABILIY_IS_BV_VOLUME
|
---|
[1287] | 1915 | mTermMinProbability *= mBoundingBox.GetVolume();
|
---|
[1370] | 1916 | // probability that bounding volume is seen
|
---|
| 1917 | const float prop = GetBoundingBox().GetVolume();
|
---|
| 1918 | #else
|
---|
| 1919 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
|
---|
| 1920 | // probability that volume is "seen" from the view cells
|
---|
[1294] | 1921 | const float prop = EvalViewCellsVolume(objects);
|
---|
[1287] | 1922 | #endif
|
---|
[1237] | 1923 |
|
---|
[1370] | 1924 | // only rays intersecting objects in node are interesting
|
---|
| 1925 | const int nRays = AssociateObjectsWithRays(sampleRays);
|
---|
| 1926 | //Debug << "using " << nRays << " of " << (int)sampleRays.size() << " rays" << endl;
|
---|
| 1927 |
|
---|
[1288] | 1928 | // create bvh traversal data
|
---|
[1548] | 1929 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
|
---|
[1237] | 1930 |
|
---|
[1357] | 1931 | // create sorted object lists for the first data
|
---|
| 1932 | if (mUseGlobalSorting)
|
---|
| 1933 | {
|
---|
[1580] | 1934 | AssignInitialSortedObjectList(oData);
|
---|
[1357] | 1935 | }
|
---|
| 1936 |
|
---|
| 1937 |
|
---|
[1449] | 1938 | ///////////////////
|
---|
[1294] | 1939 | //-- add first candidate for object space partition
|
---|
[1357] | 1940 |
|
---|
[1686] | 1941 | BvhSubdivisionCandidate *oSubdivisionCandidate = new BvhSubdivisionCandidate(oData);
|
---|
[1237] | 1942 |
|
---|
[1686] | 1943 | // evaluate priority
|
---|
[1237] | 1944 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
|
---|
[1548] | 1945 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
|
---|
[1237] | 1946 |
|
---|
[1698] | 1947 | mTotalCost = EvalRenderCost(objects);
|
---|
[1662] | 1948 | mPvsEntries = CountViewCells(objects);
|
---|
[1237] | 1949 |
|
---|
[1287] | 1950 | PrintSubdivisionStats(*oSubdivisionCandidate);
|
---|
[1649] | 1951 |
|
---|
[1237] | 1952 | return oSubdivisionCandidate;
|
---|
| 1953 | }
|
---|
| 1954 |
|
---|
| 1955 |
|
---|
[1580] | 1956 | void BvHierarchy::AssignInitialSortedObjectList(BvhTraversalData &tData)
|
---|
[1357] | 1957 | {
|
---|
| 1958 | // we sort the objects as a preprocess so they don't have
|
---|
| 1959 | // to be sorted for each split
|
---|
| 1960 | for (int i = 0; i < 3; ++ i)
|
---|
| 1961 | {
|
---|
[1580] | 1962 | // create new objects
|
---|
| 1963 | if (!mSortedObjects[i])
|
---|
| 1964 | {
|
---|
| 1965 | mSortedObjects[i] = new SortableEntryContainer();
|
---|
| 1966 | CreateLocalSubdivisionCandidates(tData.mNode->mObjects, &mSortedObjects[i], true, i);
|
---|
| 1967 | }
|
---|
| 1968 |
|
---|
| 1969 | // copy list into traversal data list
|
---|
[1357] | 1970 | tData.mSortedObjects[i] = new ObjectContainer();
|
---|
[1580] | 1971 | tData.mSortedObjects[i]->reserve((int)mSortedObjects[i]->size());
|
---|
[1357] | 1972 |
|
---|
[1580] | 1973 | SortableEntryContainer::const_iterator oit, oit_end = mSortedObjects[i]->end();
|
---|
| 1974 |
|
---|
| 1975 | for (oit = mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
[1357] | 1976 | {
|
---|
| 1977 | tData.mSortedObjects[i]->push_back((*oit).mObject);
|
---|
| 1978 | }
|
---|
| 1979 | }
|
---|
| 1980 | }
|
---|
| 1981 |
|
---|
| 1982 |
|
---|
| 1983 | void BvHierarchy::AssignSortedObjects(const BvhSubdivisionCandidate &sc,
|
---|
| 1984 | BvhTraversalData &frontData,
|
---|
| 1985 | BvhTraversalData &backData)
|
---|
| 1986 | {
|
---|
| 1987 | Intersectable::NewMail();
|
---|
| 1988 |
|
---|
| 1989 | // we sorted the objects as a preprocess so they don't have
|
---|
| 1990 | // to be sorted for each split
|
---|
| 1991 | ObjectContainer::const_iterator fit, fit_end = sc.mFrontObjects.end();
|
---|
| 1992 |
|
---|
| 1993 | for (fit = sc.mFrontObjects.begin(); fit != fit_end; ++ fit)
|
---|
| 1994 | {
|
---|
| 1995 | (*fit)->Mail();
|
---|
| 1996 | }
|
---|
| 1997 |
|
---|
| 1998 | for (int i = 0; i < 3; ++ i)
|
---|
| 1999 | {
|
---|
[1359] | 2000 | frontData.mSortedObjects[i] = new ObjectContainer();
|
---|
| 2001 | backData.mSortedObjects[i] = new ObjectContainer();
|
---|
| 2002 |
|
---|
[1357] | 2003 | frontData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
| 2004 | backData.mSortedObjects[i]->reserve((int)sc.mFrontObjects.size());
|
---|
| 2005 |
|
---|
[1370] | 2006 | ObjectContainer::const_iterator oit, oit_end = sc.mParentData.mSortedObjects[i]->end();
|
---|
[1357] | 2007 |
|
---|
[1370] | 2008 | for (oit = sc.mParentData.mSortedObjects[i]->begin(); oit != oit_end; ++ oit)
|
---|
[1357] | 2009 | {
|
---|
| 2010 | if ((*oit)->Mailed())
|
---|
| 2011 | {
|
---|
| 2012 | frontData.mSortedObjects[i]->push_back(*oit);
|
---|
| 2013 | }
|
---|
| 2014 | else
|
---|
| 2015 | {
|
---|
| 2016 | backData.mSortedObjects[i]->push_back(*oit);
|
---|
| 2017 | }
|
---|
| 2018 | }
|
---|
| 2019 | }
|
---|
| 2020 | }
|
---|
| 2021 |
|
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| 2022 |
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[1548] | 2023 | SubdivisionCandidate *BvHierarchy::Reset(const VssRayContainer &sampleRays,
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| 2024 | const ObjectContainer &objects)
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| 2025 | {
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| 2026 | // reset stats
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| 2027 | mBvhStats.Reset();
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| 2028 | mBvhStats.Start();
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| 2029 | mBvhStats.nodes = 1;
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| 2030 |
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| 2031 | // reset root
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| 2032 | DEL_PTR(mRoot);
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| 2033 |
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[1640] | 2034 | BvhLeaf *bvhleaf = new BvhLeaf(mBoundingBox, NULL, (int)objects.size());
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| 2035 | bvhleaf->mObjects = objects;
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| 2036 | mRoot = bvhleaf;
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| 2037 |
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[1548] | 2038 | #if PROBABILIY_IS_BV_VOLUME
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| 2039 | mTermMinProbability *= mBoundingBox.GetVolume();
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| 2040 | // probability that bounding volume is seen
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| 2041 | const float prop = GetBoundingBox().GetVolume();
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| 2042 | #else
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| 2043 | mTermMinProbability *= mVspTree->GetBoundingBox().GetVolume();
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| 2044 | // probability that volume is "seen" from the view cells
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| 2045 | const float prop = EvalViewCellsVolume(objects);
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| 2046 | #endif
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| 2047 |
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| 2048 | const int nRays = CountRays(objects);
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| 2049 | BvhLeaf *bvhLeaf = dynamic_cast<BvhLeaf *>(mRoot);
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| 2050 |
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| 2051 | // create bvh traversal data
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| 2052 | BvhTraversalData oData(bvhLeaf, 0, prop, nRays);
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| 2053 |
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[1580] | 2054 | AssignInitialSortedObjectList(oData);
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| 2055 |
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| 2056 |
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[1548] | 2057 | ///////////////////
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| 2058 | //-- add first candidate for object space partition
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| 2059 |
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| 2060 | BvhSubdivisionCandidate *oSubdivisionCandidate =
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| 2061 | new BvhSubdivisionCandidate(oData);
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| 2062 |
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| 2063 | EvalSubdivisionCandidate(*oSubdivisionCandidate);
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| 2064 | bvhLeaf->SetSubdivisionCandidate(oSubdivisionCandidate);
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| 2065 |
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[1563] | 2066 | const float viewSpaceVol = mViewCellsManager->GetViewSpaceBox().GetVolume();
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[1548] | 2067 | mTotalCost = (float)objects.size() * prop / viewSpaceVol;
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| 2068 |
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| 2069 | PrintSubdivisionStats(*oSubdivisionCandidate);
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| 2070 |
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| 2071 | return oSubdivisionCandidate;
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| 2072 | }
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| 2073 |
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| 2074 |
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[1279] | 2075 | void BvhStatistics::Print(ostream &app) const
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| 2076 | {
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[1288] | 2077 | app << "=========== BvHierarchy statistics ===============\n";
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[1279] | 2078 |
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| 2079 | app << setprecision(4);
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| 2080 |
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| 2081 | app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
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| 2082 |
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| 2083 | app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
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| 2084 |
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| 2085 | app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
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| 2086 |
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| 2087 | app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
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| 2088 |
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| 2089 | app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits << endl;
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| 2090 |
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| 2091 | app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
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| 2092 | << maxCostNodes * 100 / (double)Leaves() << endl;
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| 2093 |
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| 2094 | app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
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| 2095 | << minProbabilityNodes * 100 / (double)Leaves() << endl;
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| 2096 |
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[1288] | 2097 |
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[1370] | 2098 | //////////////////////////////////////////////////
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| 2099 |
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| 2100 | app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
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| 2101 | << maxDepthNodes * 100 / (double)Leaves() << endl;
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| 2102 |
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[1279] | 2103 | app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
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| 2104 |
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| 2105 | app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
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| 2106 |
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| 2107 | app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
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| 2108 |
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[1370] | 2109 |
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| 2110 | ////////////////////////////////////////////////////////
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| 2111 |
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| 2112 | app << "#N_PMINOBJECTSLEAVES ( Percentage of leaves with mininum objects )\n"
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| 2113 | << minObjectsNodes * 100 / (double)Leaves() << endl;
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[1279] | 2114 |
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| 2115 | app << "#N_MAXOBJECTREFS ( Max number of object refs / leaf )\n" << maxObjectRefs << "\n";
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| 2116 |
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[1370] | 2117 | app << "#N_MINOBJECTREFS ( Min number of object refs / leaf )\n" << minObjectRefs << "\n";
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[1408] | 2118 |
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| 2119 | app << "#N_EMPTYLEAFS ( Empty leafs )\n" << emptyNodes << "\n";
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[1279] | 2120 |
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[1370] | 2121 | app << "#N_PAVGOBJECTSLEAVES ( average object refs / leaf)\n" << AvgObjectRefs() << endl;
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| 2122 |
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| 2123 |
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| 2124 | ////////////////////////////////////////////////////////
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| 2125 |
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| 2126 | app << "#N_PMINRAYSLEAVES ( Percentage of leaves with mininum rays )\n"
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| 2127 | << minRaysNodes * 100 / (double)Leaves() << endl;
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| 2128 |
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| 2129 | app << "#N_MAXRAYREFS ( Max number of ray refs / leaf )\n" << maxRayRefs << "\n";
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| 2130 |
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| 2131 | app << "#N_MINRAYREFS ( Min number of ray refs / leaf )\n" << minRayRefs << "\n";
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| 2132 |
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| 2133 | app << "#N_PAVGRAYLEAVES ( average ray refs / leaf )\n" << AvgRayRefs() << endl;
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| 2134 |
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| 2135 | app << "#N_PAVGRAYCONTRIBLEAVES ( Average ray contribution)\n" <<
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| 2136 | rayRefs / (double)objectRefs << endl;
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| 2137 |
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| 2138 | app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"<<
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| 2139 | maxRayContriNodes * 100 / (double)Leaves() << endl;
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| 2140 |
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[1449] | 2141 | app << "#N_PGLOBALCOSTMISSES ( Global cost misses )\n" << mGlobalCostMisses << endl;
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| 2142 |
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[1370] | 2143 | app << "========== END OF BvHierarchy statistics ==========\n";
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[1272] | 2144 | }
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[1259] | 2145 |
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[1279] | 2146 |
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[1640] | 2147 | // TODO: return memory usage in MB
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| 2148 | float BvHierarchy::GetMemUsage() const
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| 2149 | {
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[1686] | 2150 | return (float)(sizeof(BvHierarchy)
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| 2151 | + mBvhStats.Leaves() * sizeof(BvhLeaf)
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| 2152 | + mBvhStats.Interior() * sizeof(BvhInterior)
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| 2153 | ) / float(1024 * 1024);
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[1640] | 2154 | }
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| 2155 |
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| 2156 |
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[1707] | 2157 | void BvHierarchy::SetActive(BvhNode *node) const
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| 2158 | {
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| 2159 | vector<BvhLeaf *> leaves;
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| 2160 |
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| 2161 | // sets the pointers to the currently active view cells
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| 2162 | CollectLeaves(node, leaves);
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| 2163 |
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| 2164 | vector<BvhLeaf *>::const_iterator bit, bit_end = leaves.end();
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| 2165 |
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| 2166 | for (bit = leaves.begin(); bit != bit_end; ++ bit)
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| 2167 | {
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| 2168 | (*bit)->SetActiveNode(node);
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| 2169 | }
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| 2170 | }
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| 2171 |
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| 2172 |
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[1686] | 2173 | BvhNode *BvHierarchy::SubdivideAndCopy(SplitQueue &tQueue,
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| 2174 | SubdivisionCandidate *splitCandidate)
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[1684] | 2175 | {
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[1686] | 2176 | BvhSubdivisionCandidate *sc =
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| 2177 | dynamic_cast<BvhSubdivisionCandidate *>(splitCandidate);
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[1684] | 2178 | BvhTraversalData &tData = sc->mParentData;
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| 2179 |
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| 2180 | BvhNode *currentNode = tData.mNode;
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| 2181 | BvhNode *oldNode = (BvhNode *)splitCandidate->mEvaluationHack;
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| 2182 |
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| 2183 | if (!oldNode->IsLeaf())
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| 2184 | {
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| 2185 | //////////////
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| 2186 | //-- continue subdivision
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| 2187 |
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| 2188 | BvhTraversalData tFrontData;
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| 2189 | BvhTraversalData tBackData;
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| 2190 |
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| 2191 | BvhInterior *oldInterior = dynamic_cast<BvhInterior *>(oldNode);
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[1686] | 2192 |
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[1692] | 2193 | sc->mFrontObjects.clear();
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| 2194 | sc->mBackObjects.clear();
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| 2195 |
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[1684] | 2196 | oldInterior->GetFront()->CollectObjects(sc->mFrontObjects);
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| 2197 | oldInterior->GetBack()->CollectObjects(sc->mBackObjects);
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[1686] | 2198 |
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| 2199 | // evaluate the changes in render cost and pvs entries
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| 2200 | EvalSubdivisionCandidate(*sc, false);
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[1684] | 2201 |
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| 2202 | // create new interior node and two leaf node
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| 2203 | currentNode = SubdivideNode(*sc, tFrontData, tBackData);
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| 2204 |
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[1692] | 2205 | //oldNode->mRenderCostDecr += sc->GetRenderCostDecrease();
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| 2206 | //oldNode->mPvsEntriesIncr += sc->GetPvsEntriesIncr();
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| 2207 |
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| 2208 | oldNode->mRenderCostDecr = sc->GetRenderCostDecrease();
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| 2209 | oldNode->mPvsEntriesIncr = sc->GetPvsEntriesIncr();
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| 2210 |
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[1684] | 2211 | ///////////////////////////
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| 2212 | //-- push the new split candidates on the queue
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| 2213 |
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| 2214 | BvhSubdivisionCandidate *frontCandidate = new BvhSubdivisionCandidate(tFrontData);
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| 2215 | BvhSubdivisionCandidate *backCandidate = new BvhSubdivisionCandidate(tBackData);
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| 2216 |
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| 2217 | frontCandidate->SetPriority((float)-oldInterior->GetFront()->mTimeStamp);
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[1687] | 2218 | backCandidate->SetPriority((float)-oldInterior->GetBack()->mTimeStamp);
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[1684] | 2219 |
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| 2220 | frontCandidate->mEvaluationHack = oldInterior->GetFront();
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| 2221 | backCandidate->mEvaluationHack = oldInterior->GetBack();
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| 2222 |
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| 2223 | // cross reference
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| 2224 | tFrontData.mNode->SetSubdivisionCandidate(frontCandidate);
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| 2225 | tBackData.mNode->SetSubdivisionCandidate(backCandidate);
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| 2226 |
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| 2227 | //cout << "f: " << frontCandidate->GetPriority() << " b: " << backCandidate->GetPriority() << endl;
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| 2228 | tQueue.Push(frontCandidate);
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| 2229 | tQueue.Push(backCandidate);
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| 2230 | }
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| 2231 |
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| 2232 | /////////////////////////////////
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| 2233 | //-- node is a leaf => terminate traversal
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| 2234 |
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| 2235 | if (currentNode->IsLeaf())
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| 2236 | {
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| 2237 | // this leaf is no candidate for splitting anymore
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| 2238 | // => detach subdivision candidate
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| 2239 | tData.mNode->SetSubdivisionCandidate(NULL);
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| 2240 | // detach node so we don't delete it with the traversal data
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| 2241 | tData.mNode = NULL;
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| 2242 | }
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| 2243 |
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| 2244 | return currentNode;
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| 2245 | }
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| 2246 |
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| 2247 |
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[1279] | 2248 | } |
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