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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspKdTree.cpp @ 1012

Revision 1012, 59.8 KB checked in by mattausch, 18 years ago (diff)

Rev	Line
[408]	1
	2	// ================================================================
	3	// $Id: lsds_kdtree.cpp,v 1.18 2005/04/16 09:34:21 bittner Exp $
	4	// ****************************************************************
	5	/**
	6	The KD tree based LSDS
	7	*/
	8	// Initial coding by
	9	/**
	10	@author Jiri Bittner
	11	*/
	12
	13	// Standard headers
[406]	14	#include <stack>
[408]	15	#include <queue>
[406]	16	#include <algorithm>
[408]	17	#include <fstream>
	18	#include <string>
	19
	20	#include "VspKdTree.h"
	21
[406]	22	#include "Environment.h"
[408]	23	#include "VssRay.h"
	24	#include "Intersectable.h"
	25	#include "Ray.h"
[420]	26	#include "RayInfo.h"
[453]	27	#include "ViewCellsManager.h"
[462]	28	#include "ViewCellBsp.h"
[406]	29
[863]	30	namespace GtpVisibilityPreprocessor {
[860]	31
[418]	32	// Static variables
[462]	33	int VspKdLeaf::sMailId = 0;
[580]	34	int VspKdMergeCandidate::sMaxPvsSize = 150;
	35	float VspKdMergeCandidate::sOverallCost = Limits::Small;
[428]	36	#define USE_FIXEDPOINT_T 0
	37
[420]	38	/// Adds object to the pvs of the front and back node
[409]	39	inline void AddObject2Pvs(Intersectable *object,
	40	const int side,
	41	int &pvsBack,
	42	int &pvsFront)
[406]	43	{
[408]	44	if (!object)
	45	return;
[465]	46
	47	if (side <= 0)
[409]	48	{
[465]	49	if (!object->Mailed() && !object->Mailed(2))
[409]	50	{
	51	++ pvsBack;
	52
[408]	53	if (object->Mailed(1))
	54	object->Mail(2);
	55	else
	56	object->Mail();
	57	}
	58	}
[465]	59
[428]	60	if (side >= 0)
[409]	61	{
[465]	62	if (!object->Mailed(1) && !object->Mailed(2))
[409]	63	{
	64	++ pvsFront;
[428]	65
[408]	66	if (object->Mailed())
	67	object->Mail(2);
	68	else
	69	object->Mail(1);
	70	}
	71	}
[406]	72	}
	73
[418]	74	/**************************************************************/
[1006]	75	/* class VspKdNode implementation */
[420]	76	/**************************************************************/
	77
	78	// Inline constructor
[500]	79	VspKdNode::VspKdNode(VspKdNode *p):
[465]	80	mParent(p), mAxis(-1), mDepth(p ? p->mDepth + 1 : 0)
[420]	81	{}
	82
[465]	83	VspKdNode::~VspKdNode()
[480]	84	{
	85	};
[420]	86
[500]	87	inline VspKdNode *VspKdNode::GetParent() const
[420]	88	{
	89	return mParent;
	90	}
	91
[500]	92	inline void VspKdNode::SetParent(VspKdNode *p)
[420]	93	{
	94	mParent = p;
	95	}
	96
[465]	97	bool VspKdNode::IsLeaf() const
	98	{
	99	return mAxis == -1;
[420]	100	}
[465]	101
	102	int VspKdNode::GetAccessTime()
[420]	103	{
	104	return 0x7FFFFFF;
	105	}
	106
	107	/**************************************************************/
[462]	108	/* VspKdInterior implementation */
[418]	109	/**************************************************************/
[408]	110
[462]	111	VspKdInterior::VspKdInterior(VspKdInterior *p):
	112	VspKdNode(p), mBack(NULL), mFront(NULL), mAccesses(0), mLastAccessTime(-1)
[418]	113	{
	114	}
	115
[462]	116	int VspKdInterior::GetAccessTime()
[418]	117	{
[419]	118	return mLastAccessTime;
[418]	119	}
	120
[465]	121	void VspKdInterior::SetupChildLinks(VspKdNode b, VspKdNode f)
[418]	122	{
	123	mBack = b;
	124	mFront = f;
[420]	125	b->SetParent(this);
	126	f->SetParent(this);
[418]	127	}
	128
[465]	129	void VspKdInterior::ReplaceChildLink(VspKdNode *oldChild,
[500]	130	VspKdNode *newChild)
[418]	131	{
	132	if (mBack == oldChild)
	133	mBack = newChild;
	134	else
	135	mFront = newChild;
	136	}
	137
[465]	138	int VspKdInterior::Type() const
	139	{
	140	return EInterior;
[418]	141	}
[465]	142
[462]	143	VspKdInterior::~VspKdInterior()
[418]	144	{
	145	DEL_PTR(mBack);
	146	DEL_PTR(mFront);
	147	}
[465]	148
[1011]	149
[465]	150	void VspKdInterior::Print(ostream &s) const
[418]	151	{
[423]	152	switch (mAxis)
	153	{
	154	case 0:
	155	s << "x "; break;
	156	case 1:
	157	s << "y "; break;
	158	case 2:
	159	s << "z "; break;
	160	}
	161
[419]	162	s << mPosition << " ";
[418]	163
	164	mBack->Print(s);
	165	mFront->Print(s);
	166	}
[465]	167
[1011]	168
[465]	169	int VspKdInterior::ComputeRayIntersection(const RayInfo &rayData, float &t)
[418]	170	{
[419]	171	return rayData.ComputeRayIntersection(mAxis, mPosition, t);
[418]	172	}
	173
[1011]	174
[462]	175	VspKdNode *VspKdInterior::GetBack() const
[419]	176	{
	177	return mBack;
	178	}
[418]	179
[1011]	180
[462]	181	VspKdNode *VspKdInterior::GetFront() const
[406]	182	{
[419]	183	return mFront;
	184	}
[406]	185
[420]	186
[486]	187	/*******************************************************************/
	188	/* class VspKdLeaf implementation */
	189	/*******************************************************************/
[462]	190
	191
[500]	192	VspKdLeaf::VspKdLeaf(VspKdNode *p,
[472]	193	const int nRays,
	194	const int maxCostMisses):
	195	VspKdNode(p), mRays(), mPvsSize(0), mValidPvs(false), mViewCell(NULL),
[495]	196	mMaxCostMisses(maxCostMisses), mPvs(NULL), mVolume(0)
[420]	197	{
	198	mRays.reserve(nRays);
	199	}
	200
[465]	201	VspKdLeaf::~VspKdLeaf()
[462]	202	{
[495]	203	DEL_PTR(mPvs);
[462]	204	}
[420]	205
[472]	206
	207	int VspKdLeaf::GetMaxCostMisses()
	208	{
	209	return mMaxCostMisses;
	210	}
	211
	212
[465]	213	int VspKdLeaf::Type() const
	214	{
	215	return ELeaf;
[420]	216	}
	217
[465]	218	void VspKdLeaf::Print(ostream &s) const
[420]	219	{
	220	s << endl << "L: r = " << (int)mRays.size() << endl;
	221	};
	222
[465]	223	void VspKdLeaf::AddRay(const RayInfo &data)
[420]	224	{
	225	mValidPvs = false;
	226	mRays.push_back(data);
	227	data.mRay->Ref();
	228	}
	229
[465]	230	int VspKdLeaf::GetPvsSize() const
[420]	231	{
	232	return mPvsSize;
	233	}
	234
[465]	235	void VspKdLeaf::SetPvsSize(const int s)
[420]	236	{
	237	mPvsSize = s;
	238	}
	239
[462]	240	void VspKdLeaf::Mail()
[465]	241	{
	242	mMailbox = sMailId;
[420]	243	}
	244
[465]	245	void VspKdLeaf::NewMail()
	246	{
	247	++ sMailId;
[420]	248	}
	249
[465]	250	bool VspKdLeaf::Mailed() const
	251	{
	252	return mMailbox == sMailId;
[420]	253	}
	254
[462]	255	bool VspKdLeaf::Mailed(const int mail) const
[420]	256	{
[462]	257	return mMailbox == mail;
[420]	258	}
	259
[462]	260	int VspKdLeaf::GetMailbox() const
[420]	261	{
[462]	262	return mMailbox;
	263	}
	264
[465]	265	float VspKdLeaf::GetAvgRayContribution() const
[462]	266	{
[420]	267	return GetPvsSize() / ((float)mRays.size() + Limits::Small);
	268	}
	269
[465]	270	float VspKdLeaf::GetSqrRayContribution() const
[420]	271	{
	272	return sqr(GetAvgRayContribution());
	273	}
	274
[462]	275	RayInfoContainer &VspKdLeaf::GetRays()
[426]	276	{
	277	return mRays;
	278	}
[428]	279
[462]	280	void VspKdLeaf::ExtractPvs(ObjectContainer &objects) const
[428]	281	{
	282	RayInfoContainer::const_iterator it, it_end = mRays.end();
	283
	284	for (it = mRays.begin(); it != it_end; ++ it)
	285	{
	286	if ((*it).mRay->mTerminationObject)
	287	objects.push_back((*it).mRay->mTerminationObject);
	288	if ((*it).mRay->mOriginObject)
	289	objects.push_back((*it).mRay->mOriginObject);
	290	}
	291	}
	292
[462]	293	void VspKdLeaf::GetRays(VssRayContainer &rays)
[428]	294	{
	295	RayInfoContainer::const_iterator it, it_end = mRays.end();
	296
	297	for (it = mRays.begin(); it != mRays.end(); ++ it)
	298	rays.push_back((*it).mRay);
	299	}
	300
[462]	301	VspKdViewCell *VspKdLeaf::GetViewCell()
[453]	302	{
	303	return mViewCell;
	304	}
	305
[462]	306	void VspKdLeaf::SetViewCell(VspKdViewCell *viewCell)
	307	{
	308	mViewCell = viewCell;
	309	}
	310
	311
	312	void VspKdLeaf::UpdatePvsSize()
	313	{
[465]	314	if (!mValidPvs)
[462]	315	{
	316	Intersectable::NewMail();
	317	int pvsSize = 0;
[465]	318	for(RayInfoContainer::iterator ri = mRays.begin();
[462]	319	ri != mRays.end(); ++ ri)
	320	{
[465]	321	if ((*ri).mRay->IsActive())
[462]	322	{
	323	Intersectable *object;
	324	#if BIDIRECTIONAL_RAY
	325	object = (*ri).mRay->mOriginObject;
[465]	326
	327	if (object && !object->Mailed())
[462]	328	{
	329	++ pvsSize;
	330	object->Mail();
	331	}
	332	#endif
	333	object = (*ri).mRay->mTerminationObject;
[465]	334	if (object && !object->Mailed())
[462]	335	{
	336	++ pvsSize;
	337	object->Mail();
	338	}
	339	}
	340	}
	341
	342	mPvsSize = pvsSize;
	343	mValidPvs = true;
	344	}
	345	}
	346
[420]	347
[500]	348	/***************************************************************/
	349	/* class VspKdIntermediate implementation */
	350	/***************************************************************/
[420]	351
[500]	352
	353	VspKdIntermediate::VspKdIntermediate(VspKdInterior *p):
	354	VspKdNode(p), mBack(NULL), mFront(NULL), mAccesses(0), mLastAccessTime(-1)
	355	{
	356	}
	357
	358
	359	VspKdIntermediate::~VspKdIntermediate()
	360	{
	361	DEL_PTR(mFront);
	362	DEL_PTR(mBack);
	363	}
	364
	365
	366	int VspKdIntermediate::Type() const
	367	{
	368	return EIntermediate;
	369	}
	370
	371
	372	VspKdLeaf *VspKdIntermediate::GetBack() const
	373	{
	374	return mBack;
	375	}
	376
	377
	378	VspKdLeaf *VspKdIntermediate::GetFront() const
	379	{
	380	return mFront;
	381	}
	382
	383
	384	void VspKdIntermediate::Print(ostream &s) const
	385	{
	386	s << endl << mSplitPlane << endl;
	387	}
	388
	389
	390	void VspKdIntermediate::SetupChildLinks(VspKdLeaf b, VspKdLeaf f)
	391	{
	392	mBack = b;
	393	mFront = f;
	394
	395	b->SetParent(this);
	396	f->SetParent(this);
	397	}
	398
	399
	400	int VspKdIntermediate::ComputeRayIntersection(const RayInfo &rayData, float &t)
	401	{
	402	return rayData.ComputeRayIntersection(mSplitPlane, t);
	403	}
	404
	405
	406	/*************************************************************/
	407	/* class VspKdTree implementation */
	408	/*************************************************************/
	409
	410
[482]	411	VspKdTree::VspKdTree(): mOnlyDrivingAxis(false)
[465]	412	{
[1004]	413	Environment::GetSingleton()->GetIntValue("VspKdTree.Termination.maxDepth", mTermMaxDepth);
	414	Environment::GetSingleton()->GetIntValue("VspKdTree.Termination.minPvs", mTermMinPvs);
	415	Environment::GetSingleton()->GetIntValue("VspKdTree.Termination.minRays", mTermMinRays);
	416	Environment::GetSingleton()->GetFloatValue("VspKdTree.Termination.maxRayContribution", mTermMaxRayContribution);
	417	Environment::GetSingleton()->GetFloatValue("VspKdTree.Termination.maxCostRatio", mTermMaxCostRatio);
	418	Environment::GetSingleton()->GetFloatValue("VspKdTree.Termination.minSize", mTermMinSize);
[421]	419
[1004]	420	Environment::GetSingleton()->GetIntValue("VspKdTree.Termination.missTolerance", mTermMissTolerance);
[472]	421
[421]	422	mTermMinSize = sqr(mTermMinSize);
	423
[1004]	424	Environment::GetSingleton()->GetFloatValue("VspKdTree.epsilon", mEpsilon);
	425	Environment::GetSingleton()->GetFloatValue("VspKdTree.ct_div_ci", mCtDivCi);
[465]	426
[1004]	427	Environment::GetSingleton()->GetFloatValue("VspKdTree.maxTotalMemory", mMaxTotalMemory);
	428	Environment::GetSingleton()->GetFloatValue("VspKdTree.maxStaticMemory", mMaxStaticMemory);
[465]	429
[1004]	430	Environment::GetSingleton()->GetIntValue("VspKdTree.accessTimeThreshold", mAccessTimeThreshold);
	431	Environment::GetSingleton()->GetIntValue("VspKdTree.minCollapseDepth", mMinCollapseDepth);
[408]	432
[1004]	433	//Environment::GetSingleton()->GetIntValue("ViewCells.maxViewCells", mMaxViewCells);
[462]	434
[1004]	435	Environment::GetSingleton()->GetIntValue("VspKdTree.PostProcess.minViewCells", mMergeMinViewCells);
	436	Environment::GetSingleton()->GetFloatValue("VspKdTree.PostProcess.maxCostRatio", mMergeMaxCostRatio);
	437	Environment::GetSingleton()->GetIntValue("VspKdTree.PostProcess.maxPvsSize",
[580]	438	VspKdMergeCandidate::sMaxPvsSize);
[462]	439
[1004]	440	Environment::GetSingleton()->GetBoolValue("VspKdTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
	441	Environment::GetSingleton()->GetIntValue("VspKdTree.Termination.maxViewCells", mMaxViewCells);
[465]	442
[485]	443	//-- output
[423]	444	Debug << "======= vsp kd tree options ========" << endl;
	445	Debug << "max depth: "<< mTermMaxDepth << endl;
	446	Debug << "min pvs: "<< mTermMinPvs << endl;
	447	Debug << "min rays: "<< mTermMinRays << endl;
	448	Debug << "max ray contribution: "<< mTermMaxRayContribution << endl;
[473]	449	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
	450	Debug << "min size: " << mTermMinSize << endl;
[423]	451
[485]	452	Debug << "split type: ";
	453
	454	//-- split type
	455	char sname[128];
[1004]	456	Environment::GetSingleton()->GetStringValue("VspKdTree.splitType", sname);
[485]	457	string name(sname);
	458
[409]	459	if (name.compare("regular") == 0)
[423]	460	{
[485]	461	Debug << "regular split" << endl;
[409]	462	splitType = ESplitRegular;
[423]	463	}
[409]	464	else
	465	{
	466	if (name.compare("heuristic") == 0)
[423]	467	{
[485]	468	Debug << "heuristic split" << endl;
[409]	469	splitType = ESplitHeuristic;
[423]	470	}
[465]	471	else
[409]	472	{
	473	cerr << "Invalid VspKdTree split type " << name << endl;
[408]	474	exit(1);
	475	}
[409]	476	}
[408]	477
[418]	478	mRoot = NULL;
[422]	479	mSplitCandidates = new vector<SortableEntry>;
[406]	480	}
	481
[408]	482
	483	VspKdTree::~VspKdTree()
[406]	484	{
[419]	485	DEL_PTR(mRoot);
[449]	486	DEL_PTR(mSplitCandidates);
[408]	487	}
[406]	488
[418]	489	void VspKdStatistics::Print(ostream &app) const
[408]	490	{
[426]	491	app << "===== VspKdTree statistics ===============\n";
[408]	492
[426]	493	app << "#N_RAYS ( Number of rays )\n"
	494	<< rays << endl;
[465]	495
[426]	496	app << "#N_INITPVS ( Initial PVS size )\n"
	497	<< initialPvsSize << endl;
[465]	498
[426]	499	app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
[406]	500
[426]	501	app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
[406]	502
[667]	503	app << "#N_SPLITS ( Number of splits in axes x y z)\n";
[465]	504
[482]	505	for (int i = 0; i < 3; ++ i)
	506	app << splits[i] << " ";
[426]	507	app << endl;
[406]	508
[426]	509	app << "#N_RAYREFS ( Number of rayRefs )\n" <<
	510	rayRefs << "\n";
[408]	511
[426]	512	app << "#N_RAYRAYREFS ( Number of rayRefs / ray )\n" <<
	513	rayRefs / (double)rays << "\n";
[408]	514
[426]	515	app << "#N_LEAFRAYREFS ( Number of rayRefs / leaf )\n" <<
	516	rayRefs / (double)Leaves() << "\n";
[408]	517
[426]	518	app << "#N_MAXRAYREFS ( Max number of rayRefs / leaf )\n" <<
	519	maxRayRefs << "\n";
[408]	520
	521	// app << setprecision(4);
	522
[426]	523	app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maxdepth )\n" <<
	524	maxDepthNodes * 100 / (double)Leaves() << endl;
[408]	525
[426]	526	app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n" <<
	527	minPvsNodes * 100 / (double)Leaves() << endl;
[408]	528
[426]	529	app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n" <<
	530	minRaysNodes * 100 / (double)Leaves() << endl;
	531
[408]	532	app << "#N_PMINSIZELEAVES ( Percentage of leaves with minSize )\n"<<
[426]	533	minSizeNodes * 100 / (double)Leaves() << endl;
[408]	534
[426]	535	app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n" <<
	536	maxRayContribNodes * 100 / (double)Leaves() << endl;
[408]	537
[482]	538	app << "#N_PMAXRCOSTLEAVES ( Percentage of leaves with maximal cost ratio )\n" <<
	539	maxCostNodes * 100 / (double)Leaves() << endl;
	540
[426]	541	app << "#N_ADDED_RAYREFS ( Number of dynamically added ray references )\n"<<
	542	addedRayRefs << endl;
[408]	543
[426]	544	app << "#N_REMOVED_RAYREFS ( Number of dynamically removed ray references )\n"<<
	545	removedRayRefs << endl;
[408]	546
[426]	547	// app << setprecision(4);
[408]	548
[462]	549	app << "#N_( Maximal PVS size / leaf)\n"
[426]	550	<< maxPvsSize << endl;
[408]	551
[482]	552	app << "#N_( Average PVS size / leaf)\n"
	553	<< (double) accPvsSize / (double)Leaves() << endl;
	554
[426]	555	app << "#N_CTIME ( Construction time [s] )\n"
	556	<< Time() << " \n";
[408]	557
[426]	558	app << "===== END OF VspKdTree statistics ==========\n";
[406]	559	}
	560
[408]	561
[463]	562	void VspKdTree::CollectViewCells(ViewCellContainer &viewCells) const
	563	{
	564	stack<VspKdNode *> nodeStack;
	565	nodeStack.push(mRoot);
	566
	567	ViewCell::NewMail();
	568
[465]	569	while (!nodeStack.empty())
[463]	570	{
	571	VspKdNode *node = nodeStack.top();
	572	nodeStack.pop();
	573
[465]	574	if (node->IsLeaf())
[463]	575	{
	576	ViewCell viewCell = dynamic_cast<VspKdLeaf >(node)->mViewCell;
	577
[465]	578	if (!viewCell->Mailed())
[463]	579	{
	580	viewCell->Mail();
	581	viewCells.push_back(viewCell);
	582	}
	583	}
[465]	584	else
[463]	585	{
	586	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
	587
	588	nodeStack.push(interior->GetFront());
	589	nodeStack.push(interior->GetBack());
	590	}
	591	}
[408]	592	}
[406]	593
[462]	594	void VspKdTree::Construct(const VssRayContainer &rays,
	595	AxisAlignedBox3 *forcedBoundingBox)
[452]	596	{
[414]	597	mStat.Start();
[465]	598
[422]	599	mMaxMemory = mMaxStaticMemory;
[419]	600	DEL_PTR(mRoot);
[408]	601
[462]	602	mRoot = new VspKdLeaf(NULL, (int)rays.size());
[408]	603
[423]	604	// first construct a leaf that will get subdivided
[462]	605	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(mRoot);
[465]	606
[414]	607	mStat.nodes = 1;
[448]	608	mBox.Initialize();
[452]	609
[448]	610	//-- compute bounding box
[409]	611	if (forcedBoundingBox)
[419]	612	mBox = *forcedBoundingBox;
[448]	613	else
	614	for (VssRayContainer::const_iterator ri = rays.begin(); ri != rays.end(); ++ ri)
	615	{
[452]	616	if ((*ri)->mOriginObject)
	617	mBox.Include((*ri)->GetOrigin());
	618	if ((*ri)->mTerminationObject)
[465]	619	mBox.Include((*ri)->GetTermination());
[448]	620	}
[408]	621
[422]	622	Debug << "bbox = " << mBox << endl;
[448]	623
	624	for (VssRayContainer::const_iterator ri = rays.begin(); ri != rays.end(); ++ ri)
	625	{
	626	//leaf->AddRay(RayInfo(*ri));
[463]	627	VssRay ray = ri;
	628	float minT, maxT;
[482]	629
	630	// TODO: not very efficient to implictly cast between rays types!
[463]	631	if (mBox.GetRaySegment(*ray, minT, maxT))
	632	{
	633	float len = ray->Length();
[465]	634
	635	if (!len)
[463]	636	len = Limits::Small;
[465]	637
	638	leaf->AddRay(RayInfo(ray, minT / len, maxT / len));
[448]	639	}
	640	}
[465]	641
[420]	642	mStat.rays = (int)leaf->mRays.size();
[408]	643	leaf->UpdatePvsSize();
[465]	644
[414]	645	mStat.initialPvsSize = leaf->GetPvsSize();
[465]	646
[409]	647	// Subdivide();
[419]	648	mRoot = Subdivide(TraversalData(leaf, mBox, 0));
[408]	649
[465]	650	if (mSplitCandidates)
[409]	651	{
[422]	652	// force release of this vector
	653	delete mSplitCandidates;
	654	mSplitCandidates = new vector<SortableEntry>;
[409]	655	}
[465]	656
[414]	657	mStat.Stop();
[408]	658
[414]	659	mStat.Print(cout);
[423]	660	Debug << "#Total memory=" << GetMemUsage() << endl;
[408]	661	}
	662
	663
	664
[462]	665	VspKdNode *VspKdTree::Subdivide(const TraversalData &tdata)
[408]	666	{
[462]	667	VspKdNode *result = NULL;
[408]	668
[409]	669	priority_queue<TraversalData> tStack;
[423]	670	//stack<TraversalData> tStack;
[465]	671
[409]	672	tStack.push(tdata);
[406]	673
[409]	674	AxisAlignedBox3 backBox;
	675	AxisAlignedBox3 frontBox;
[465]	676
[408]	677	int lastMem = 0;
[423]	678
[465]	679	while (!tStack.empty())
[409]	680	{
[408]	681	float mem = GetMemUsage();
[465]	682
	683	if (lastMem / 10 != ((int)mem) / 10)
[409]	684	{
[425]	685	Debug << mem << " MB" << endl;
[408]	686	}
	687	lastMem = (int)mem;
[465]	688
	689	if (1 && mem > mMaxMemory)
[409]	690	{
[423]	691	Debug << "memory limit reached: " << mem << endl;
[409]	692	// count statistics on unprocessed leafs
[465]	693	while (!tStack.empty())
[409]	694	{
[408]	695	EvaluateLeafStats(tStack.top());
	696	tStack.pop();
[409]	697	}
	698	break;
	699	}
[465]	700
[409]	701	TraversalData data = tStack.top();
[465]	702	tStack.pop();
	703
[472]	704	VspKdNode node = SubdivideNode(dynamic_cast<VspKdLeaf >(data.mNode),
	705	data.mBox, backBox, frontBox);
[409]	706	if (result == NULL)
	707	result = node;
[465]	708
	709	if (!node->IsLeaf())
[409]	710	{
[462]	711	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
[408]	712
[409]	713	// push the children on the stack
[419]	714	tStack.push(TraversalData(interior->GetBack(), backBox, data.mDepth + 1));
	715	tStack.push(TraversalData(interior->GetFront(), frontBox, data.mDepth + 1));
[465]	716	}
	717	else
[409]	718	{
	719	EvaluateLeafStats(data);
	720	}
	721	}
	722
	723	return result;
[408]	724	}
[406]	725
[408]	726
	727	// returns selected plane for subdivision
[462]	728	int VspKdTree::SelectPlane(VspKdLeaf *leaf,
[424]	729	const AxisAlignedBox3 &box,
	730	float &position,
	731	int &raysBack,
	732	int &raysFront,
	733	int &pvsBack,
	734	int &pvsFront)
[408]	735	{
[428]	736	int axis = 0;
	737	float costRatio = 0;
[465]	738
	739	if (splitType == ESplitRegular)
[422]	740	{
[408]	741	costRatio = BestCostRatioRegular(leaf,
[480]	742	box,
[410]	743	axis,
	744	position,
	745	raysBack,
	746	raysFront,
	747	pvsBack,
	748	pvsFront);
[465]	749	}
[423]	750	else if (splitType == ESplitHeuristic)
[410]	751	{
[472]	752	costRatio = BestCostRatioHeuristic(leaf,
[480]	753	box,
[472]	754	axis,
	755	position,
	756	raysBack,
	757	raysFront,
	758	pvsBack,
	759	pvsFront);
[423]	760	}
[465]	761	else
[423]	762	{
	763	cerr << "VspKdTree: Unknown split heuristics\n";
	764	exit(1);
	765	}
[408]	766
[465]	767	if (costRatio > mTermMaxCostRatio)
[410]	768	{
[482]	769	//Debug << "Too big cost ratio " << costRatio << endl;
	770	++ leaf->mMaxCostMisses;
	771	if (leaf->mMaxCostMisses > mTermMissTolerance)
	772	{
	773	++ mStat.maxCostNodes;
	774	return -1;
	775	}
[408]	776	}
	777
[428]	778	if (0)
[465]	779	Debug << "pvs=" << leaf->mPvsSize
	780	<< " rays=" << (int)leaf->mRays.size()
	781	<< " rc=" << leaf->GetAvgRayContribution()
[428]	782	<< " axis=" << axis << endl;
[465]	783
[408]	784	return axis;
[406]	785	}
	786
	787
[465]	788
[462]	789	float VspKdTree::EvalCostRatio(VspKdLeaf *leaf,
[480]	790	const AxisAlignedBox3 &box,
[425]	791	const int axis,
	792	const float position,
	793	int &raysBack,
	794	int &raysFront,
	795	int &pvsBack,
	796	int &pvsFront)
[406]	797	{
[408]	798	raysBack = 0;
	799	raysFront = 0;
	800	pvsFront = 0;
	801	pvsBack = 0;
	802
	803	Intersectable::NewMail(3);
[465]	804
[408]	805	// eval pvs size
[482]	806	const int pvsSize = leaf->GetPvsSize();
[408]	807
[419]	808	// this is the main ray classification loop!
[480]	809	for(RayInfoContainer::iterator ri = leaf->mRays.begin();
[463]	810	ri != leaf->mRays.end(); ++ ri)
[480]	811	{
	812	if (!(*ri).mRay->IsActive())
	813	continue;
[465]	814
[480]	815	// determine the side of this ray with respect to the plane
	816	float t;
	817	int side = (*ri).ComputeRayIntersection(axis, position, t);
	818
[419]	819	if (side <= 0)
	820	++ raysBack;
[465]	821
[419]	822	if (side >= 0)
	823	++ raysFront;
[465]	824
[419]	825	AddObject2Pvs((*ri).mRay->mTerminationObject, side, pvsBack, pvsFront);
[465]	826	}
[408]	827
[482]	828	//-- only one of these options should be one
	829
	830	if (0) //-- only pvs
[425]	831	{
[428]	832	const float sum = float(pvsBack + pvsFront);
[482]	833	const float oldCost = (float)pvsSize;
[425]	834
	835	return sum / oldCost;
	836	}
[482]	837
	838	//-- pvs + probability heuristics
	839	float pBack, pFront, pOverall;
	840
[542]	841	if (1)
[428]	842	{
[482]	843	// box length substitute for probability
	844	const float minBox = box.Min(axis);
	845	const float maxBox = box.Max(axis);
[480]	846
[482]	847	pBack = position - minBox;
	848	pFront = maxBox - position;
	849	pOverall = maxBox - minBox;
	850	}
[465]	851
[542]	852	if (0) //-- area substitute for probability
[482]	853	{
[495]	854	pOverall = box.SurfaceArea();
	855
[482]	856	const bool useMidSplit = true;
[495]	857	//const bool useMidSplit = false;
	858
[482]	859	if (!useMidSplit)
	860	{
	861	Vector3 pos = box.Max(); pos[axis] = position;
	862	pBack = AxisAlignedBox3(box.Min(), pos).SurfaceArea();
[480]	863
[482]	864	pos = box.Min(); pos[axis] = position;
	865	pFront = AxisAlignedBox3(pos, box.Max()).SurfaceArea();
	866	}
	867	else
	868	{
	869	//-- simplified computation for mid split
	870	const int axis2 = (axis + 1) % 3;
	871	const int axis3 = (axis + 2) % 3;
[480]	872
[482]	873	const float faceArea =
	874	(box.Max(axis2) - box.Min(axis2)) *
	875	(box.Max(axis3) - box.Min(axis3));
[408]	876
[482]	877	pBack = pFront = pOverall * 0.5f + faceArea;
	878	}
	879	}
[465]	880
[482]	881	//-- ray density substitute for probability
[483]	882	if (0)
[482]	883	{
	884	pBack = (float)raysBack;
	885	pFront = (float)raysFront;
	886	pOverall = (float)leaf->mRays.size();
	887	}
[465]	888
[482]	889	//Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
	890	//Debug << pFront << " " << pBack << " " << pOverall << endl;
	891
	892	// float sum = raysBack(position - minBox) + raysFront(maxBox - position);
	893	const float newCost = pvsBack * pBack + pvsFront * pFront;
	894	// float oldCost = leaf->mRays.size();
	895	const float oldCost = (float)pvsSize * pOverall;
	896
	897	return (mCtDivCi + newCost) / oldCost;
[406]	898	}
	899
[491]	900
[462]	901	float VspKdTree::BestCostRatioRegular(VspKdLeaf *leaf,
[480]	902	const AxisAlignedBox3 &box,
[422]	903	int &axis,
	904	float &position,
	905	int &raysBack,
	906	int &raysFront,
	907	int &pvsBack,
	908	int &pvsFront)
[408]	909	{
[422]	910	int nRaysBack[3], nRaysFront[3];
	911	int nPvsBack[3], nPvsFront[3];
	912
	913	float nPosition[3];
	914	float nCostRatio[3];
[408]	915	int bestAxis = -1;
[465]	916
[480]	917	//AxisAlignedBox3 sBox = GetBBox(leaf);
	918	const int sAxis = box.Size().DrivingAxis();
[408]	919
[465]	920	for (axis = 0; axis < 3; ++ axis)
[410]	921	{
[465]	922	if (!mOnlyDrivingAxis \|\| axis == sAxis)
[410]	923	{
[465]	924
[480]	925	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
[465]	926
[408]	927	nCostRatio[axis] = EvalCostRatio(leaf,
[480]	928	box,
[410]	929	axis,
	930	nPosition[axis],
	931	nRaysBack[axis],
	932	nRaysFront[axis],
	933	nPvsBack[axis],
	934	nPvsFront[axis]);
	935	if (bestAxis == -1)
[452]	936	{
[408]	937	bestAxis = axis;
[452]	938	}
	939	else if (nCostRatio[axis] < nCostRatio[bestAxis])
	940	{
[465]	941	/*Debug << "pvs front " << nPvsBack[axis]
[452]	942	<< " pvs back " << nPvsFront[axis]
	943	<< " overall pvs " << leaf->GetPvsSize() << endl;*/
	944	bestAxis = axis;
	945	}
[465]	946
[408]	947	}
	948	}
	949
[428]	950	//-- assign best axis
[408]	951	axis = bestAxis;
	952	position = nPosition[bestAxis];
	953
	954	raysBack = nRaysBack[bestAxis];
	955	raysFront = nRaysFront[bestAxis];
	956
	957	pvsBack = nPvsBack[bestAxis];
	958	pvsFront = nPvsFront[bestAxis];
[465]	959
[408]	960	return nCostRatio[bestAxis];
	961	}
	962
[462]	963	float VspKdTree::BestCostRatioHeuristic(VspKdLeaf *leaf,
[480]	964	const AxisAlignedBox3 &box,
[410]	965	int &axis,
	966	float &position,
	967	int &raysBack,
	968	int &raysFront,
	969	int &pvsBack,
	970	int &pvsFront)
[406]	971	{
[480]	972	//AxisAlignedBox3 box = GetBBox(leaf);
[408]	973	// AxisAlignedBox3 dirBox = GetDirBBox(node);
[465]	974
[408]	975	axis = box.Size().DrivingAxis();
[465]	976
[408]	977	SortSplitCandidates(leaf, axis);
[465]	978
[408]	979	// go through the lists, count the number of objects left and right
	980	// and evaluate the following cost funcion:
	981	// C = ct_div_ci + (qlrl + qrrr)/queries
[465]	982
[420]	983	int rl = 0, rr = (int)leaf->mRays.size();
	984	int pl = 0, pr = leaf->GetPvsSize();
[424]	985
[408]	986	float minBox = box.Min(axis);
	987	float maxBox = box.Max(axis);
	988	float sizeBox = maxBox - minBox;
[465]	989
[419]	990	float minBand = minBox + 0.1f*(maxBox - minBox);
	991	float maxBand = minBox + 0.9f*(maxBox - minBox);
[465]	992
[408]	993	float sum = rr*sizeBox;
[411]	994	float minSum = 1e20f;
[465]	995
[408]	996	Intersectable::NewMail();
[424]	997
[408]	998	// set all object as belonging to the fron pvs
[420]	999	for(RayInfoContainer::iterator ri = leaf->mRays.begin();
[424]	1000	ri != leaf->mRays.end(); ++ ri)
[410]	1001	{
	1002	if ((*ri).mRay->IsActive())
	1003	{
[408]	1004	Intersectable object = (ri).mRay->mTerminationObject;
[465]	1005
[408]	1006	if (object)
[465]	1007	if (!object->Mailed())
[410]	1008	{
[408]	1009	object->Mail();
	1010	object->mCounter = 1;
[465]	1011	}
[410]	1012	else
	1013	++ object->mCounter;
[408]	1014	}
[410]	1015	}
[465]	1016
[408]	1017	Intersectable::NewMail();
[465]	1018
[422]	1019	for (vector<SortableEntry>::const_iterator ci = mSplitCandidates->begin();
[465]	1020	ci < mSplitCandidates->end(); ++ ci)
[410]	1021	{
[408]	1022	VssRay *ray;
[465]	1023
	1024	switch ((*ci).type)
[410]	1025	{
[465]	1026	case SortableEntry::ERayMin:
[410]	1027	{
	1028	++ rl;
[482]	1029	ray = (*ci).ray;
[410]	1030	Intersectable *object = ray->mTerminationObject;
[465]	1031	if (object && !object->Mailed())
[410]	1032	{
	1033	object->Mail();
	1034	++ pl;
	1035	}
	1036	break;
	1037	}
[465]	1038	case SortableEntry::ERayMax:
[410]	1039	{
	1040	-- rr;
[465]	1041
[482]	1042	ray = (*ci).ray;
[410]	1043	Intersectable *object = ray->mTerminationObject;
[465]	1044
[410]	1045	if (object)
	1046	{
	1047	if (-- object->mCounter == 0)
	1048	-- pr;
	1049	}
[465]	1050
[410]	1051	break;
	1052	}
[408]	1053	}
[465]	1054
	1055	if ((ci).value > minBand && (ci).value < maxBand)
[410]	1056	{
[408]	1057	sum = pl((ci).value - minBox) + pr(maxBox - (ci).value);
[465]	1058
[410]	1059	// cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
	1060	// cout<<"cost= "<<sum<<endl;
[465]	1061
	1062	if (sum < minSum)
[410]	1063	{
[408]	1064	minSum = sum;
	1065	position = (*ci).value;
[465]	1066
[408]	1067	raysBack = rl;
	1068	raysFront = rr;
[465]	1069
[408]	1070	pvsBack = pl;
	1071	pvsFront = pr;
[465]	1072
[410]	1073	}
	1074	}
	1075	}
	1076
[419]	1077	float oldCost = (float)leaf->GetPvsSize();
[422]	1078	float newCost = mCtDivCi + minSum / sizeBox;
[410]	1079	float ratio = newCost / oldCost;
[465]	1080
[422]	1081	//Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
	1082	// <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
[465]	1083
[408]	1084	return ratio;
	1085	}
	1086
[462]	1087	void VspKdTree::SortSplitCandidates(VspKdLeaf *node,
[410]	1088	const int axis)
[408]	1089	{
[422]	1090	mSplitCandidates->clear();
[465]	1091
[420]	1092	int requestedSize = 2 * (int)(node->mRays.size());
[410]	1093	// creates a sorted split candidates array
[422]	1094	if (mSplitCandidates->capacity() > 500000 &&
[465]	1095	requestedSize < (int)(mSplitCandidates->capacity()/10) )
[410]	1096	{
[449]	1097	DEL_PTR(mSplitCandidates);
[422]	1098	mSplitCandidates = new vector<SortableEntry>;
[410]	1099	}
[465]	1100
[422]	1101	mSplitCandidates->reserve(requestedSize);
[408]	1102
[465]	1103	// insert all queries
[420]	1104	for(RayInfoContainer::const_iterator ri = node->mRays.begin();
[465]	1105	ri < node->mRays.end(); ++ ri)
[410]	1106	{
	1107	bool positive = (*ri).mRay->HasPosDir(axis);
[465]	1108	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
[482]	1109	(ri).ExtrapOrigin(axis), (ri).mRay));
[465]	1110
[422]	1111	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
[482]	1112	(ri).ExtrapTermination(axis), (ri).mRay));
[410]	1113	}
[465]	1114
[422]	1115	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
[406]	1116	}
	1117
[408]	1118
[410]	1119	void VspKdTree::EvaluateLeafStats(const TraversalData &data)
[406]	1120	{
[410]	1121	// the node became a leaf -> evaluate stats for leafs
[462]	1122	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(data.mNode);
[408]	1123
[426]	1124	if (leaf->GetPvsSize() > mStat.maxPvsSize)
	1125	mStat.maxPvsSize = leaf->GetPvsSize();
	1126
	1127	if ((int)(leaf->mRays.size()) > mStat.maxRayRefs)
	1128	mStat.maxRayRefs = (int)leaf->mRays.size();
	1129
[482]	1130	mStat.rays += (int)leaf->mRays.size();
[426]	1131
[421]	1132	if (data.mDepth >= mTermMaxDepth)
[744]	1133	{
[413]	1134	++ mStat.maxDepthNodes;
[744]	1135	}
[465]	1136
[421]	1137	if (leaf->GetPvsSize() < mTermMinPvs)
[413]	1138	++ mStat.minPvsNodes;
[408]	1139
[482]	1140	mStat.accPvsSize += leaf->GetPvsSize();
	1141
[426]	1142	if ((int)leaf->GetRays().size() < mTermMinRays)
[413]	1143	++ mStat.minRaysNodes;
[408]	1144
[426]	1145	if (leaf->GetAvgRayContribution() > mTermMaxRayContribution)
[413]	1146	++ mStat.maxRayContribNodes;
[465]	1147
	1148	if (SqrMagnitude(data.mBox.Size()) <= mTermMinSize)
[413]	1149	++ mStat.minSizeNodes;
[408]	1150	}
	1151
	1152
[465]	1153	inline bool VspKdTree::TerminationCriteriaMet(const VspKdLeaf *leaf,
[421]	1154	const AxisAlignedBox3 &box) const
	1155	{
[465]	1156	return ((leaf->GetPvsSize() < mTermMinPvs) \|\|
[426]	1157	(leaf->mRays.size() < mTermMinRays) \|\|
[482]	1158	(leaf->GetAvgRayContribution() > mTermMaxRayContribution ) \|\|
[465]	1159	(leaf->mDepth >= mTermMaxDepth) \|\|
[587]	1160	(mStat.Leaves() >= mMaxViewCells) \|\|
[423]	1161	(SqrMagnitude(box.Size()) <= mTermMinSize));
[421]	1162	}
[408]	1163
[421]	1164
[462]	1165	VspKdNode VspKdTree::SubdivideNode(VspKdLeaf leaf,
[472]	1166	const AxisAlignedBox3 &box,
	1167	AxisAlignedBox3 &backBBox,
	1168	AxisAlignedBox3 &frontBBox)
[408]	1169	{
[421]	1170	if (TerminationCriteriaMet(leaf, box))
[410]	1171	{
[465]	1172	if (1 && leaf->mDepth >= mTermMaxDepth)
[422]	1173	{
[428]	1174	Debug << "Warning: max depth reached depth=" << (int)leaf->mDepth<<" rays=" << (int)leaf->mRays.size() << endl;
	1175	Debug << "Bbox: " << GetBBox(leaf) << endl;
[408]	1176	}
[428]	1177	//Debug << "depth: " << (int)leaf->mDepth << " pvs: " << leaf->GetPvsSize() << " rays: " << leaf->mRays.size() << endl;
[465]	1178
[408]	1179	return leaf;
	1180	}
[465]	1181
[408]	1182	float position;
	1183	// first count ray sides
[410]	1184	int raysBack;
	1185	int raysFront;
[408]	1186	int pvsBack;
	1187	int pvsFront;
[465]	1188
[410]	1189	// select subdivision axis
[425]	1190	const int axis = SelectPlane(leaf, box, position, raysBack, raysFront, pvsBack, pvsFront);
[426]	1191	//Debug << "rays back=" << raysBack << " rays front=" << raysFront << " pvs back=" << pvsBack << " pvs front=" << pvsFront << endl;
[408]	1192
[465]	1193	if (axis == -1)
[482]	1194	return leaf;
	1195
[413]	1196	mStat.nodes += 2;
[482]	1197	++ mStat.splits[axis];
[408]	1198
[410]	1199	// add the new nodes to the tree
[500]	1200	VspKdInterior *node =
	1201	new VspKdInterior(dynamic_cast<VspKdInterior *>(leaf->mParent));
[406]	1202
[419]	1203	node->mAxis = axis;
	1204	node->mPosition = position;
	1205	node->mBox = box;
[465]	1206
[410]	1207	backBBox = box;
	1208	frontBBox = box;
[406]	1209
[482]	1210	VspKdLeaf *back = new VspKdLeaf(node, raysBack, leaf->GetMaxCostMisses());
[408]	1211	back->SetPvsSize(pvsBack);
[482]	1212	VspKdLeaf *front = new VspKdLeaf(node, raysFront, leaf->GetMaxCostMisses());
[408]	1213	front->SetPvsSize(pvsFront);
[406]	1214
[410]	1215	// replace a link from node's parent
[419]	1216	if (leaf->mParent)
[500]	1217	{
	1218	VspKdInterior parent = dynamic_cast<VspKdInterior >(leaf->mParent);
	1219	parent->ReplaceChildLink(leaf, node);
	1220	}
[501]	1221
[410]	1222	// and setup child links
	1223	node->SetupChildLinks(back, front);
[465]	1224
	1225	if (axis <= VspKdNode::SPLIT_Z)
[410]	1226	{
[408]	1227	backBBox.SetMax(axis, position);
[410]	1228	frontBBox.SetMin(axis, position);
[465]	1229
[420]	1230	for(RayInfoContainer::iterator ri = leaf->mRays.begin();
[465]	1231	ri != leaf->mRays.end(); ++ ri)
[410]	1232	{
[465]	1233	if ((*ri).mRay->IsActive())
[410]	1234	{
[408]	1235	// first unref ray from the former leaf
	1236	(*ri).mRay->Unref();
[463]	1237	float t;
[408]	1238	// determine the side of this ray with respect to the plane
[463]	1239	int side = node->ComputeRayIntersection(*ri, t);
[408]	1240
[465]	1241	if (side == 0)
[410]	1242	{
[465]	1243	if ((*ri).mRay->HasPosDir(axis))
[410]	1244	{
[420]	1245	back->AddRay(RayInfo((*ri).mRay,
	1246	(*ri).mMinT,
[463]	1247	t));
[420]	1248	front->AddRay(RayInfo((*ri).mRay,
[463]	1249	t,
[420]	1250	(*ri).mMaxT));
[465]	1251	}
	1252	else
[410]	1253	{
[420]	1254	back->AddRay(RayInfo((*ri).mRay,
[463]	1255	t,
[420]	1256	(*ri).mMaxT));
	1257	front->AddRay(RayInfo((*ri).mRay,
	1258	(*ri).mMinT,
[463]	1259	t));
[408]	1260	}
[465]	1261	}
[410]	1262	else
[465]	1263	if (side == 1)
[408]	1264	front->AddRay(*ri);
	1265	else
	1266	back->AddRay(*ri);
[410]	1267	} else
[408]	1268	(*ri).mRay->Unref();
[410]	1269	}
[465]	1270	}
	1271	else
[410]	1272	{
	1273	// rays front/back
[465]	1274
[420]	1275	for (RayInfoContainer::iterator ri = leaf->mRays.begin();
[465]	1276	ri != leaf->mRays.end(); ++ ri)
[410]	1277	{
[465]	1278	if ((*ri).mRay->IsActive())
[410]	1279	{
[408]	1280	// first unref ray from the former leaf
	1281	(*ri).mRay->Unref();
	1282
	1283	int side;
	1284	if ((*ri).mRay->GetDirParametrization(axis - 3) > position)
	1285	side = 1;
	1286	else
	1287	side = -1;
[465]	1288
[408]	1289	if (side == 1)
	1290	front->AddRay(*ri);
	1291	else
[465]	1292	back->AddRay(*ri);
	1293	}
[410]	1294	else
[408]	1295	(*ri).mRay->Unref();
[410]	1296	}
	1297	}
[465]	1298
[410]	1299	// update stats
[420]	1300	mStat.rayRefs -= (int)leaf->mRays.size();
[414]	1301	mStat.rayRefs += raysBack + raysFront;
[408]	1302
[420]	1303	DEL_PTR(leaf);
	1304
[410]	1305	return node;
[406]	1306	}
	1307
[410]	1308	int VspKdTree::ReleaseMemory(const int time)
	1309	{
[462]	1310	stack<VspKdNode *> tstack;
[406]	1311
[410]	1312	// find a node in the tree which subtree will be collapsed
[422]	1313	int maxAccessTime = time - mAccessTimeThreshold;
[420]	1314	int released = 0;
[406]	1315
[419]	1316	tstack.push(mRoot);
[406]	1317
[423]	1318	while (!tstack.empty())
[410]	1319	{
[462]	1320	VspKdNode *node = tstack.top();
[410]	1321	tstack.pop();
[465]	1322
	1323	if (!node->IsLeaf())
[410]	1324	{
[462]	1325	VspKdInterior in = dynamic_cast<VspKdInterior >(node);
[410]	1326	// cout<<"depth="<<(int)in->depth<<" time="<<in->lastAccessTime<<endl;
[465]	1327	if (in->mDepth >= mMinCollapseDepth && in->mLastAccessTime <= maxAccessTime)
[410]	1328	{
	1329	released = CollapseSubtree(node, time);
	1330	break;
	1331	}
[465]	1332	if (in->GetBack()->GetAccessTime() < in->GetFront()->GetAccessTime())
[410]	1333	{
[419]	1334	tstack.push(in->GetFront());
	1335	tstack.push(in->GetBack());
[465]	1336	}
	1337	else
[410]	1338	{
[419]	1339	tstack.push(in->GetBack());
	1340	tstack.push(in->GetFront());
[410]	1341	}
	1342	}
	1343	}
[406]	1344
[465]	1345	while (tstack.empty())
[410]	1346	{
	1347	// could find node to collaps...
	1348	// cout<<"Could not find a node to release "<<endl;
	1349	break;
	1350	}
[465]	1351
[410]	1352	return released;
[408]	1353	}
[406]	1354
	1355
[462]	1356	VspKdNode VspKdTree::SubdivideLeaf(VspKdLeaf leaf,
[410]	1357	const float sizeThreshold)
[408]	1358	{
[462]	1359	VspKdNode *node = leaf;
[406]	1360
[410]	1361	AxisAlignedBox3 leafBBox = GetBBox(leaf);
[406]	1362
[408]	1363	static int pass = 0;
[410]	1364	++ pass;
[465]	1365
[410]	1366	// check if we should perform a dynamic subdivision of the leaf
[420]	1367	if (// leaf->mRays.size() > (unsigned)termMinCost &&
[465]	1368	(leaf->GetPvsSize() >= mTermMinPvs) &&
[410]	1369	(SqrMagnitude(leafBBox.Size()) > sizeThreshold) )
	1370	{
[423]	1371	// memory check and release
[465]	1372	if (GetMemUsage() > mMaxTotalMemory)
[410]	1373	ReleaseMemory(pass);
[465]	1374
[410]	1375	AxisAlignedBox3 backBBox, frontBBox;
[406]	1376
[410]	1377	// subdivide the node
	1378	node = SubdivideNode(leaf, leafBBox, backBBox, frontBBox);
	1379	}
	1380	return node;
[406]	1381	}
	1382
	1383
	1384
[423]	1385	void VspKdTree::UpdateRays(VssRayContainer &remove,
	1386	VssRayContainer &add)
[406]	1387	{
[462]	1388	VspKdLeaf::NewMail();
[406]	1389
[410]	1390	// schedule rays for removal
	1391	for(VssRayContainer::const_iterator ri = remove.begin();
[465]	1392	ri != remove.end(); ++ ri)
[410]	1393	{
[465]	1394	(*ri)->ScheduleForRemoval();
[410]	1395	}
[406]	1396
[410]	1397	int inactive = 0;
[406]	1398
[465]	1399	for (VssRayContainer::const_iterator ri = remove.begin(); ri != remove.end(); ++ ri)
[410]	1400	{
	1401	if ((*ri)->ScheduledForRemoval())
	1402	// RemoveRay(*ri, NULL, false);
	1403	// !!! BUG - with true it does not work correctly - aggreated delete
	1404	RemoveRay(*ri, NULL, true);
	1405	else
	1406	++ inactive;
	1407	}
[406]	1408
[410]	1409	// cout<<"all/inactive"<<remove.size()<<"/"<<inactive<<endl;
[465]	1410	for (VssRayContainer::const_iterator ri = add.begin(); ri != add.end(); ++ ri)
[410]	1411	{
	1412	AddRay(*ri);
	1413	}
[406]	1414	}
	1415
	1416
[410]	1417	void VspKdTree::RemoveRay(VssRay *ray,
[462]	1418	vector<VspKdLeaf > affectedLeaves,
[410]	1419	const bool removeAllScheduledRays)
[406]	1420	{
[410]	1421	stack<RayTraversalData> tstack;
[406]	1422
[420]	1423	tstack.push(RayTraversalData(mRoot, RayInfo(ray)));
[465]	1424
[410]	1425	RayTraversalData data;
[406]	1426
[410]	1427	// cout<<"Number of ray refs = "<<ray->RefCount()<<endl;
[465]	1428	while (!tstack.empty())
[410]	1429	{
	1430	data = tstack.top();
	1431	tstack.pop();
[406]	1432
[465]	1433	if (!data.mNode->IsLeaf())
[410]	1434	{
	1435	// split the set of rays in two groups intersecting the
	1436	// two subtrees
	1437	TraverseInternalNode(data, tstack);
[465]	1438	}
	1439	else
[410]	1440	{
	1441	// remove the ray from the leaf
	1442	// find the ray in the leaf and swap it with the last ray...
[462]	1443	VspKdLeaf leaf = (VspKdLeaf )data.mNode;
[465]	1444
	1445	if (!leaf->Mailed())
[410]	1446	{
	1447	leaf->Mail();
[465]	1448
[410]	1449	if (affectedLeaves)
	1450	affectedLeaves->push_back(leaf);
[465]	1451
	1452	if (removeAllScheduledRays)
[410]	1453	{
[420]	1454	int tail = (int)leaf->mRays.size() - 1;
[406]	1455
[465]	1456	for (int i=0; i < (int)(leaf->mRays.size()); ++ i)
[410]	1457	{
[465]	1458	if (leaf->mRays[i].mRay->ScheduledForRemoval())
[410]	1459	{
	1460	// find a ray to replace it with
[465]	1461	while (tail >= i && leaf->mRays[tail].mRay->ScheduledForRemoval())
[410]	1462	{
[414]	1463	++ mStat.removedRayRefs;
[420]	1464	leaf->mRays[tail].mRay->Unref();
	1465	leaf->mRays.pop_back();
[465]	1466
[410]	1467	-- tail;
	1468	}
[465]	1469
[410]	1470	if (tail < i)
	1471	break;
[465]	1472
[414]	1473	++ mStat.removedRayRefs;
[465]	1474
[420]	1475	leaf->mRays[i].mRay->Unref();
	1476	leaf->mRays[i] = leaf->mRays[tail];
	1477	leaf->mRays.pop_back();
[410]	1478	-- tail;
	1479	}
	1480	}
	1481	}
	1482	}
[465]	1483
[410]	1484	if (!removeAllScheduledRays)
[465]	1485	for (int i=0; i < (int)leaf->mRays.size(); i++)
[410]	1486	{
[465]	1487	if (leaf->mRays[i].mRay == ray)
[410]	1488	{
[414]	1489	++ mStat.removedRayRefs;
[410]	1490	ray->Unref();
[420]	1491	leaf->mRays[i] = leaf->mRays[leaf->mRays.size() - 1];
	1492	leaf->mRays.pop_back();
[410]	1493	// check this ray again
	1494	break;
	1495	}
	1496	}
	1497	}
[408]	1498	}
	1499
[465]	1500	if (ray->RefCount() != 0)
[410]	1501	{
	1502	cerr << "Error: Number of remaining refs = " << ray->RefCount() << endl;
	1503	exit(1);
	1504	}
	1505
[406]	1506	}
	1507
[410]	1508	void VspKdTree::AddRay(VssRay *ray)
[406]	1509	{
[410]	1510	stack<RayTraversalData> tstack;
[465]	1511
[420]	1512	tstack.push(RayTraversalData(mRoot, RayInfo(ray)));
[465]	1513
[410]	1514	RayTraversalData data;
[465]	1515
	1516	while (!tstack.empty())
[410]	1517	{
	1518	data = tstack.top();
	1519	tstack.pop();
[406]	1520
[465]	1521	if (!data.mNode->IsLeaf())
[410]	1522	{
	1523	TraverseInternalNode(data, tstack);
[465]	1524	}
	1525	else
[410]	1526	{
	1527	// remove the ray from the leaf
[420]	1528	// find the ray in the leaf and swap it with the last ray
[462]	1529	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(data.mNode);
[423]	1530
[419]	1531	leaf->AddRay(data.mRayData);
[413]	1532	++ mStat.addedRayRefs;
[410]	1533	}
	1534	}
[406]	1535	}
	1536
[465]	1537	void VspKdTree::TraverseInternalNode(RayTraversalData &data,
[410]	1538	stack<RayTraversalData> &tstack)
[406]	1539	{
[462]	1540	VspKdInterior in = dynamic_cast<VspKdInterior >(data.mNode);
[465]	1541
	1542	if (in->mAxis <= VspKdNode::SPLIT_Z)
[410]	1543	{
	1544	// determine the side of this ray with respect to the plane
[485]	1545	float t;
	1546	const int side = in->ComputeRayIntersection(data.mRayData, t);
[465]	1547
	1548	if (side == 0)
[410]	1549	{
[465]	1550	if (data.mRayData.mRay->HasPosDir(in->mAxis))
[433]	1551	{
[465]	1552	tstack.push(RayTraversalData(in->GetBack(),
[463]	1553	RayInfo(data.mRayData.mRay, data.mRayData.mMinT, t)));
[465]	1554
[433]	1555	tstack.push(RayTraversalData(in->GetFront(),
[463]	1556	RayInfo(data.mRayData.mRay, t, data.mRayData.mMaxT)));
[465]	1557
	1558	}
	1559	else
[433]	1560	{
	1561	tstack.push(RayTraversalData(in->GetBack(),
	1562	RayInfo(data.mRayData.mRay,
[463]	1563	t,
[433]	1564	data.mRayData.mMaxT)));
	1565	tstack.push(RayTraversalData(in->GetFront(),
	1566	RayInfo(data.mRayData.mRay,
	1567	data.mRayData.mMinT,
[463]	1568	t)));
[433]	1569	}
[410]	1570	}
[433]	1571	else
	1572	if (side == 1)
	1573	tstack.push(RayTraversalData(in->GetFront(), data.mRayData));
	1574	else
	1575	tstack.push(RayTraversalData(in->GetBack(), data.mRayData));
[465]	1576	}
	1577	else
[410]	1578	{
	1579	// directional split
[419]	1580	if (data.mRayData.mRay->GetDirParametrization(in->mAxis - 3) > in->mPosition)
	1581	tstack.push(RayTraversalData(in->GetFront(), data.mRayData));
[408]	1582	else
[419]	1583	tstack.push(RayTraversalData(in->GetBack(), data.mRayData));
[410]	1584	}
[406]	1585	}
	1586
[408]	1587
[462]	1588	int VspKdTree::CollapseSubtree(VspKdNode *sroot, const int time)
[406]	1589	{
[410]	1590	// first count all rays in the subtree
	1591	// use mail 1 for this purpose
[462]	1592	stack<VspKdNode *> tstack;
[465]	1593
[410]	1594	int rayCount = 0;
	1595	int totalRayCount = 0;
	1596	int collapsedNodes = 0;
[408]	1597
	1598	#if DEBUG_COLLAPSE
[420]	1599	cout << "Collapsing subtree" << endl;
[428]	1600	cout << "accessTime=" << sroot->GetAccessTime() << endl;
[420]	1601	cout << "depth=" << (int)sroot->depth << endl;
[408]	1602	#endif
	1603
[410]	1604	// tstat.collapsedSubtrees++;
	1605	// tstat.collapseDepths += (int)sroot->depth;
	1606	// tstat.collapseAccessTimes += time - sroot->GetAccessTime();
	1607	tstack.push(sroot);
	1608	VssRay::NewMail();
[465]	1609
	1610	while (!tstack.empty())
[410]	1611	{
	1612	++ collapsedNodes;
[465]	1613
[462]	1614	VspKdNode *node = tstack.top();
[410]	1615	tstack.pop();
[465]	1616	if (node->IsLeaf())
[410]	1617	{
[462]	1618	VspKdLeaf leaf = (VspKdLeaf ) node;
[465]	1619
[420]	1620	for(RayInfoContainer::iterator ri = leaf->mRays.begin();
[465]	1621	ri != leaf->mRays.end(); ++ ri)
[410]	1622	{
	1623	++ totalRayCount;
[465]	1624
	1625	if ((ri).mRay->IsActive() && !(ri).mRay->Mailed())
[410]	1626	{
[408]	1627	(*ri).mRay->Mail();
[410]	1628	++ rayCount;
[408]	1629	}
[410]	1630	}
[465]	1631	}
	1632	else
[410]	1633	{
[472]	1634	tstack.push(dynamic_cast<VspKdInterior *>(node)->GetFront());
	1635	tstack.push(dynamic_cast<VspKdInterior *>(node)->GetBack());
[410]	1636	}
	1637	}
[465]	1638
[410]	1639	VssRay::NewMail();
[406]	1640
[410]	1641	// create a new node that will hold the rays
[462]	1642	VspKdLeaf *newLeaf = new VspKdLeaf(sroot->mParent, rayCount);
[465]	1643
[500]	1644	VspKdInterior *parent =
	1645	dynamic_cast<VspKdInterior *>(newLeaf->mParent);
	1646
	1647	if (parent)
[472]	1648	{
[500]	1649	parent->ReplaceChildLink(sroot, newLeaf);
[472]	1650	}
[410]	1651	tstack.push(sroot);
[406]	1652
[465]	1653	while (!tstack.empty())
[410]	1654	{
[462]	1655	VspKdNode *node = tstack.top();
[410]	1656	tstack.pop();
[408]	1657
[465]	1658	if (node->IsLeaf())
[410]	1659	{
[462]	1660	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
[408]	1661
[420]	1662	for(RayInfoContainer::iterator ri = leaf->mRays.begin();
[465]	1663	ri != leaf->mRays.end(); ++ ri)
[410]	1664	{
[465]	1665	// unref this ray from the old node
	1666	if ((*ri).mRay->IsActive())
[410]	1667	{
[408]	1668	(*ri).mRay->Unref();
[465]	1669	if (!(*ri).mRay->Mailed())
[410]	1670	{
[408]	1671	(*ri).mRay->Mail();
	1672	newLeaf->AddRay(*ri);
	1673	}
[465]	1674	}
[410]	1675	else
[408]	1676	(*ri).mRay->Unref();
[410]	1677	}
[465]	1678	}
	1679	else
[410]	1680	{
[465]	1681	VspKdInterior *interior =
[462]	1682	dynamic_cast<VspKdInterior *>(node);
[419]	1683	tstack.push(interior->GetBack());
	1684	tstack.push(interior->GetFront());
[410]	1685	}
	1686	}
[465]	1687
[410]	1688	// delete the node and all its children
[420]	1689	DEL_PTR(sroot);
[465]	1690
[462]	1691	// for(VspKdNode::SRayContainer::iterator ri = newleaf->mRays.begin();
[420]	1692	// ri != newleaf->mRays.end(); ++ ri)
[410]	1693	// (*ri).ray->UnMail(2);
[408]	1694
	1695	#if DEBUG_COLLAPSE
[423]	1696	cout << "Total memory before=" << GetMemUsage() << endl;
[408]	1697	#endif
	1698
[414]	1699	mStat.nodes -= collapsedNodes - 1;
	1700	mStat.rayRefs -= totalRayCount - rayCount;
[465]	1701
[408]	1702	#if DEBUG_COLLAPSE
[410]	1703	cout << "collapsed nodes" << collapsedNodes << endl;
	1704	cout << "collapsed rays" << totalRayCount - rayCount << endl;
	1705	cout << "Total memory after=" << GetMemUsage() << endl;
	1706	cout << "================================" << endl;
[408]	1707	#endif
	1708
	1709	// tstat.collapsedNodes += collapsedNodes;
	1710	// tstat.collapsedRays += totalRayCount - rayCount;
[410]	1711	return totalRayCount - rayCount;
[406]	1712	}
	1713
[408]	1714
[462]	1715	int VspKdTree::GetPvsSize(VspKdNode *node, const AxisAlignedBox3 &box) const
[406]	1716	{
[462]	1717	stack<VspKdNode *> tstack;
[419]	1718	tstack.push(mRoot);
[408]	1719
	1720	Intersectable::NewMail();
	1721	int pvsSize = 0;
[465]	1722
	1723	while (!tstack.empty())
[410]	1724	{
[462]	1725	VspKdNode *node = tstack.top();
[410]	1726	tstack.pop();
[465]	1727
	1728	if (node->IsLeaf())
[410]	1729	{
[462]	1730	VspKdLeaf leaf = (VspKdLeaf )node;
[420]	1731	for (RayInfoContainer::iterator ri = leaf->mRays.begin();
	1732	ri != leaf->mRays.end(); ++ ri)
[410]	1733	{
[465]	1734	if ((*ri).mRay->IsActive())
[410]	1735	{
[408]	1736	Intersectable *object;
	1737	#if BIDIRECTIONAL_RAY
	1738	object = (*ri).mRay->mOriginObject;
[465]	1739
	1740	if (object && !object->Mailed())
[410]	1741	{
	1742	++ pvsSize;
[408]	1743	object->Mail();
	1744	}
	1745	#endif
	1746	object = (*ri).mRay->mTerminationObject;
[465]	1747	if (object && !object->Mailed())
[410]	1748	{
	1749	++ pvsSize;
[408]	1750	object->Mail();
	1751	}
	1752	}
[465]	1753	}
[410]	1754	}
[465]	1755	else
[410]	1756	{
[462]	1757	VspKdInterior in = dynamic_cast<VspKdInterior >(node);
[465]	1758
	1759	if (in->mAxis < 3)
[410]	1760	{
[419]	1761	if (box.Max(in->mAxis) >= in->mPosition)
	1762	tstack.push(in->GetFront());
[465]	1763
[419]	1764	if (box.Min(in->mAxis) <= in->mPosition)
	1765	tstack.push(in->GetBack());
[465]	1766	}
	1767	else
[410]	1768	{
[408]	1769	// both nodes for directional splits
[419]	1770	tstack.push(in->GetFront());
	1771	tstack.push(in->GetBack());
[408]	1772	}
	1773	}
	1774	}
[410]	1775
[408]	1776	return pvsSize;
[406]	1777	}
	1778
[410]	1779	void VspKdTree::GetRayContributionStatistics(float &minRayContribution,
	1780	float &maxRayContribution,
	1781	float &avgRayContribution)
[406]	1782	{
[462]	1783	stack<VspKdNode *> tstack;
[419]	1784	tstack.push(mRoot);
[465]	1785
[408]	1786	minRayContribution = 1.0f;
	1787	maxRayContribution = 0.0f;
[410]	1788
[408]	1789	float sumRayContribution = 0.0f;
	1790	int leaves = 0;
[406]	1791
[465]	1792	while (!tstack.empty())
[410]	1793	{
[462]	1794	VspKdNode *node = tstack.top();
[410]	1795	tstack.pop();
[465]	1796	if (node->IsLeaf())
[410]	1797	{
[408]	1798	leaves++;
[462]	1799	VspKdLeaf leaf = (VspKdLeaf )node;
[408]	1800	float c = leaf->GetAvgRayContribution();
[410]	1801
[408]	1802	if (c > maxRayContribution)
	1803	maxRayContribution = c;
	1804	if (c < minRayContribution)
	1805	minRayContribution = c;
	1806	sumRayContribution += c;
[465]	1807
	1808	}
[482]	1809	else
	1810	{
[462]	1811	VspKdInterior in = (VspKdInterior )node;
[482]	1812
[419]	1813	tstack.push(in->GetFront());
	1814	tstack.push(in->GetBack());
[408]	1815	}
	1816	}
[465]	1817
[423]	1818	Debug << "sum=" << sumRayContribution << endl;
	1819	Debug << "leaves=" << leaves << endl;
	1820	avgRayContribution = sumRayContribution / (float)leaves;
[406]	1821	}
	1822
	1823
[410]	1824	int VspKdTree::GenerateRays(const float ratioPerLeaf,
	1825	SimpleRayContainer &rays)
[406]	1826	{
[462]	1827	stack<VspKdNode *> tstack;
[419]	1828	tstack.push(mRoot);
[465]	1829
	1830	while (!tstack.empty())
[410]	1831	{
[462]	1832	VspKdNode *node = tstack.top();
[410]	1833	tstack.pop();
[465]	1834
	1835	if (node->IsLeaf())
[410]	1836	{
[462]	1837	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
[423]	1838
[408]	1839	float c = leaf->GetAvgRayContribution();
[411]	1840	int num = (int)(c*ratioPerLeaf + 0.5);
[408]	1841	// cout<<num<<" ";
	1842
[465]	1843	for (int i=0; i < num; i++)
[410]	1844	{
[408]	1845	Vector3 origin = GetBBox(leaf).GetRandomPoint();
[419]	1846	/*Vector3 dirVector = GetDirBBox(leaf).GetRandomPoint();
[408]	1847	Vector3 direction = Vector3(sin(dirVector.x), sin(dirVector.y), cos(dirVector.x));
	1848	//cout<<"dir vector.x="<<dirVector.x<<"direction'.x="<<atan2(direction.x, direction.y)<<endl;
[419]	1849	rays.push_back(SimpleRay(origin, direction));*/
[408]	1850	}
[465]	1851
	1852	}
	1853	else
[410]	1854	{
[465]	1855	VspKdInterior *in =
[462]	1856	dynamic_cast<VspKdInterior *>(node);
[482]	1857
[419]	1858	tstack.push(in->GetFront());
	1859	tstack.push(in->GetBack());
[408]	1860	}
[406]	1861	}
	1862
[411]	1863	return (int)rays.size();
[406]	1864	}
	1865
	1866
[410]	1867	float VspKdTree::GetAvgPvsSize()
[406]	1868	{
[462]	1869	stack<VspKdNode *> tstack;
[419]	1870	tstack.push(mRoot);
[406]	1871
[408]	1872	int sumPvs = 0;
	1873	int leaves = 0;
[465]	1874
	1875	while (!tstack.empty())
[410]	1876	{
[462]	1877	VspKdNode *node = tstack.top();
[410]	1878	tstack.pop();
[465]	1879
	1880	if (node->IsLeaf())
[410]	1881	{
[462]	1882	VspKdLeaf leaf = (VspKdLeaf )node;
[408]	1883	// update pvs size
	1884	leaf->UpdatePvsSize();
	1885	sumPvs += leaf->GetPvsSize();
	1886	leaves++;
[465]	1887	}
	1888	else
[410]	1889	{
[462]	1890	VspKdInterior in = (VspKdInterior )node;
[482]	1891
[419]	1892	tstack.push(in->GetFront());
	1893	tstack.push(in->GetBack());
[406]	1894	}
	1895	}
[408]	1896
[410]	1897	return sumPvs / (float)leaves;
[418]	1898	}
	1899
[462]	1900	VspKdNode *VspKdTree::GetRoot() const
[418]	1901	{
	1902	return mRoot;
	1903	}
	1904
[1012]	1905
[462]	1906	AxisAlignedBox3 VspKdTree::GetBBox(VspKdNode *node) const
[418]	1907	{
[419]	1908	if (node->mParent == NULL)
	1909	return mBox;
[418]	1910
	1911	if (!node->IsLeaf())
[500]	1912	{
	1913	if (node->Type() == VspKdNode::EIntermediate)
	1914	return (dynamic_cast<VspKdInterior *>(node))->mBox;
	1915	else
	1916	return (dynamic_cast<VspKdIntermediate *>(node))->mBox;
	1917	}
[418]	1918
[500]	1919	VspKdInterior parent = dynamic_cast<VspKdInterior >(node->mParent);
[465]	1920
[500]	1921	if (parent->mAxis >= 3)
	1922	return parent->mBox;
	1923
	1924	AxisAlignedBox3 box(parent->mBox);
	1925	if (parent->GetFront() == node)
	1926	box.SetMin(parent->mAxis, parent->mPosition);
[418]	1927	else
[500]	1928	box.SetMax(parent->mAxis, parent->mPosition);
[419]	1929
	1930	return box;
[418]	1931	}
	1932
[1012]	1933
[465]	1934	int VspKdTree::GetRootPvsSize() const
[418]	1935	{
	1936	return GetPvsSize(mRoot, mBox);
	1937	}
[419]	1938
[1012]	1939
[465]	1940	const VspKdStatistics &VspKdTree::GetStatistics() const
[419]	1941	{
	1942	return mStat;
[420]	1943	}
	1944
[1012]	1945
[420]	1946	void VspKdTree::AddRays(VssRayContainer &add)
	1947	{
	1948	VssRayContainer remove;
	1949	UpdateRays(remove, add);
	1950	}
[465]	1951
[420]	1952	// return memory usage in MB
[465]	1953	float VspKdTree::GetMemUsage() const
[420]	1954	{
[465]	1955	return
	1956	(sizeof(VspKdTree) +
[462]	1957	mStat.Leaves() * sizeof(VspKdLeaf) +
	1958	mStat.Interior() * sizeof(VspKdInterior) +
[420]	1959	mStat.rayRefs * sizeof(RayInfo)) / (1024.0f * 1024.0f);
	1960	}
[465]	1961
[1012]	1962
[465]	1963	float VspKdTree::GetRayMemUsage() const
[420]	1964	{
	1965	return mStat.rays * (sizeof(VssRay))/(1024.0f * 1024.0f);
[425]	1966	}
	1967
[482]	1968
[465]	1969	int VspKdTree::ComputePvsSize(VspKdNode *node,
[426]	1970	const RayInfoContainer &globalRays) const
[425]	1971	{
	1972	int pvsSize = 0;
	1973
	1974	const AxisAlignedBox3 box = GetBBox(node);
	1975
	1976	RayInfoContainer::const_iterator it, it_end = globalRays.end();
	1977
[495]	1978	Intersectable::NewMail();
[482]	1979
[426]	1980	// warning: implicit conversion from VssRay to Ray
[425]	1981	for (it = globalRays.begin(); it != globalRays.end(); ++ it)
[495]	1982	{
	1983	VssRay ray = (it).mRay;
[465]	1984
[495]	1985	// ray intersects node bounding box
	1986	if (box.GetMinMaxT(*ray, NULL, NULL))
	1987	{
	1988	if (ray->mTerminationObject && !ray->mTerminationObject->Mailed())
	1989	{
	1990	ray->mTerminationObject->Mail();
	1991	++ pvsSize;
	1992	}
	1993	}
	1994	}
[425]	1995	return pvsSize;
[428]	1996	}
	1997
[482]	1998
[462]	1999	void VspKdTree::CollectLeaves(vector<VspKdLeaf *> &leaves) const
[428]	2000	{
[462]	2001	stack<VspKdNode *> nodeStack;
[428]	2002	nodeStack.push(mRoot);
	2003
[465]	2004	while (!nodeStack.empty())
[428]	2005	{
[462]	2006	VspKdNode *node = nodeStack.top();
[465]	2007
[428]	2008	nodeStack.pop();
[465]	2009
	2010	if (node->IsLeaf())
[428]	2011	{
[462]	2012	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
[428]	2013	leaves.push_back(leaf);
[465]	2014	}
	2015	else
[428]	2016	{
[462]	2017	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
[428]	2018
[448]	2019	nodeStack.push(interior->GetBack());
	2020	nodeStack.push(interior->GetFront());
[428]	2021	}
	2022	}
[452]	2023	}
	2024
[503]	2025
[462]	2026	int VspKdTree::FindNeighbors(VspKdLeaf *n,
	2027	vector<VspKdLeaf *> &neighbors,
[452]	2028	bool onlyUnmailed)
	2029	{
[462]	2030	stack<VspKdNode *> nodeStack;
[465]	2031
[452]	2032	nodeStack.push(mRoot);
	2033
	2034	AxisAlignedBox3 box = GetBBox(n);
	2035
[465]	2036	while (!nodeStack.empty())
[452]	2037	{
[462]	2038	VspKdNode *node = nodeStack.top();
[452]	2039	nodeStack.pop();
	2040
[465]	2041	if (node->IsLeaf())
[452]	2042	{
[462]	2043	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
[452]	2044
[465]	2045	if (leaf != n && (!onlyUnmailed \|\| !leaf->Mailed()))
[452]	2046	neighbors.push_back(leaf);
[465]	2047	}
	2048	else
[452]	2049	{
[462]	2050	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
[452]	2051
	2052	if (interior->mPosition > box.Max(interior->mAxis))
	2053	nodeStack.push(interior->mBack);
	2054	else
	2055	{
	2056	if (interior->mPosition < box.Min(interior->mAxis))
	2057	nodeStack.push(interior->mFront);
[465]	2058	else
[452]	2059	{
	2060	// random decision
	2061	nodeStack.push(interior->mBack);
	2062	nodeStack.push(interior->mFront);
	2063	}
	2064	}
	2065	}
	2066	}
	2067
	2068	return (int)neighbors.size();
	2069	}
	2070
[462]	2071
	2072	void VspKdTree::SetViewCellsManager(ViewCellsManager *vcm)
[452]	2073	{
[462]	2074	mViewCellsManager = vcm;
	2075	}
[452]	2076
[462]	2077
[468]	2078	int VspKdTree::CastLineSegment(const Vector3 &origin,
	2079	const Vector3 &termination,
[882]	2080	ViewCellContainer &viewcells)
[462]	2081	{
	2082	int hits = 0;
[465]	2083
[468]	2084	float mint = 0.0f, maxt = 1.0f;
	2085	const Vector3 dir = termination - origin;
[465]	2086
[483]	2087	stack<LineTraversalData> tStack;
[462]	2088
	2089	Intersectable::NewMail();
	2090
[468]	2091	Vector3 entp = origin;
	2092	Vector3 extp = termination;
[465]	2093
[462]	2094	VspKdNode *node = mRoot;
	2095	VspKdNode *farChild;
	2096
	2097	float position;
	2098	int axis;
[465]	2099
	2100	while (1)
[462]	2101	{
[465]	2102	if (!node->IsLeaf())
[462]	2103	{
	2104	VspKdInterior in = dynamic_cast<VspKdInterior >(node);
	2105	position = in->mPosition;
	2106	axis = in->mAxis;
	2107
[465]	2108	if (entp[axis] <= position)
[462]	2109	{
[465]	2110	if (extp[axis] <= position)
[462]	2111	{
	2112	node = in->mBack;
	2113	// cases N1,N2,N3,P5,Z2,Z3
	2114	continue;
[465]	2115	} else
[462]	2116	{
	2117	// case N4
	2118	node = in->mBack;
	2119	farChild = in->mFront;
	2120	}
	2121	}
[465]	2122	else
[462]	2123	{
[465]	2124	if (position <= extp[axis])
[462]	2125	{
	2126	node = in->mFront;
	2127	// cases P1,P2,P3,N5,Z1
	2128	continue;
[465]	2129	}
	2130	else
[462]	2131	{
	2132	node = in->mFront;
	2133	farChild = in->mBack;
	2134	// case P4
	2135	}
	2136	}
	2137
	2138	// $$ modification 3.5.2004 - hints from Kamil Ghais
	2139	// case N4 or P4
[468]	2140	float tdist = (position - origin[axis]) / dir[axis];
[483]	2141	tStack.push(LineTraversalData(farChild, extp, maxt)); //TODO
[468]	2142	extp = origin + dir * tdist;
[462]	2143	maxt = tdist;
[465]	2144	}
	2145	else
[462]	2146	{
	2147	// compute intersection with all objects in this leaf
[468]	2148	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
	2149	ViewCell *vc = leaf->GetViewCell();
[465]	2150
[468]	2151	if (!vc->Mailed())
[462]	2152	{
[468]	2153	vc->Mail();
	2154	viewcells.push_back(vc);
[469]	2155	++ hits;
[462]	2156	}
[465]	2157
[485]	2158	if (0) //matt TODO: REMOVE LATER
[483]	2159	leaf->mRays.push_back(RayInfo(new VssRay(origin, termination, NULL, NULL, 0)));
	2160
[462]	2161	// get the next node from the stack
	2162	if (tStack.empty())
	2163	break;
[465]	2164
[462]	2165	entp = extp;
	2166	mint = maxt;
[468]	2167
[483]	2168	LineTraversalData &s = tStack.top();
[462]	2169	node = s.mNode;
	2170	extp = s.mExitPoint;
	2171	maxt = s.mMaxT;
	2172	tStack.pop();
	2173	}
	2174	}
[465]	2175
[462]	2176	return hits;
	2177	}
	2178
	2179
	2180	void VspKdTree::GenerateViewCell(VspKdLeaf *leaf)
	2181	{
	2182	RayInfoContainer::const_iterator it, it_end = leaf->GetRays().end();
	2183
	2184	VspKdViewCell vc = dynamic_cast<VspKdViewCell >(mViewCellsManager->GenerateViewCell());
	2185	leaf->SetViewCell(vc);
	2186
[479]	2187	vc->SetVolume(GetBBox(leaf).GetVolume());
	2188	vc->SetArea(GetBBox(leaf).SurfaceArea());
	2189
[580]	2190	vc->mLeaf = leaf;
[462]	2191
	2192	for (it = leaf->GetRays().begin(); it != it_end; ++ it)
	2193	{
	2194	VssRay ray = (it).mRay;
	2195
[463]	2196	if (ray->mTerminationObject)
[556]	2197	vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf);
[465]	2198
[463]	2199	if (ray->mOriginObject)
[556]	2200	vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf);
[462]	2201	}
	2202	}
	2203
	2204
[589]	2205	bool VspKdTree::MergeViewCells(VspKdLeaf l1, VspKdLeaf l2)
	2206	{
	2207	//-- change pointer to view cells of all leaves associated
	2208	//-- with the previous view cells
	2209	VspKdViewCell *fVc = l1->GetViewCell();
	2210	VspKdViewCell *bVc = l2->GetViewCell();
	2211
	2212	VspKdViewCell vc = dynamic_cast<VspKdViewCell >(
	2213	mViewCellsManager->MergeViewCells(fVc, bVc));
	2214
	2215	// if merge was unsuccessful
	2216	if (!vc) return false;
	2217	// TODO
[728]	2218	#if HAS_TO_BE_REDONE
[589]	2219	// set new size of view cell
[479]	2220	vc->SetVolume(fVc->GetVolume() + bVc->GetVolume());
[482]	2221	// new area
[589]	2222	vc->SetArea(fVc->GetArea() + bVc->GetArea());
	2223
	2224	vector<VspKdLeaf *> fLeaves = fVc->mLeaves;
	2225	vector<VspKdLeaf *> bLeaves = bVc->mLeaves;
	2226
	2227	vector<VspKdLeaf *>::const_iterator it;
	2228
	2229	//-- change view cells of all the other leaves the view cell belongs to
	2230	for (it = fLeaves.begin(); it != fLeaves.end(); ++ it)
	2231	{
	2232	(*it)->SetViewCell(vc);
	2233	vc->mLeaves.push_back(*it);
	2234	}
	2235
	2236	for (it = bLeaves.begin(); it != bLeaves.end(); ++ it)
	2237	{
	2238	(*it)->SetViewCell(vc);
	2239	vc->mLeaves.push_back(*it);
	2240	}
	2241	#endif
[465]	2242	vc->Mail();
[589]	2243
	2244	// clean up old view cells
	2245	DEL_PTR(fVc);
	2246	DEL_PTR(bVc);
	2247
[463]	2248	return true;
[462]	2249	}
	2250
[483]	2251	void VspKdTree::CollectMergeCandidates()
[462]	2252	{
[580]	2253	VspKdMergeCandidate::sOverallCost = 0;
[462]	2254	vector<VspKdLeaf *> leaves;
[465]	2255
[462]	2256	// collect the leaves, e.g., the "voxels" that will build the view cells
[452]	2257	CollectLeaves(leaves);
	2258
[462]	2259	VspKdLeaf::NewMail();
[452]	2260
[462]	2261	vector<VspKdLeaf *>::const_iterator it, it_end = leaves.end();
[452]	2262
[462]	2263	// generate view cells
[452]	2264	for (it = leaves.begin(); it != it_end; ++ it)
[462]	2265	GenerateViewCell(*it);
	2266
	2267	// find merge candidates and push them into queue
	2268	for (it = leaves.begin(); it != it_end; ++ it)
[452]	2269	{
[462]	2270	VspKdLeaf leaf = it;
[485]	2271	ViewCell *vc = leaf->GetViewCell();
[462]	2272	// no leaf is part of two merge candidates
[485]	2273	leaf->Mail();
[580]	2274	VspKdMergeCandidate::sOverallCost +=
[485]	2275	vc->GetVolume() * vc->GetPvs().GetSize();
	2276	vector<VspKdLeaf *> neighbors;
	2277	FindNeighbors(leaf, neighbors, true);
[462]	2278
[485]	2279	vector<VspKdLeaf *>::const_iterator nit,
	2280	nit_end = neighbors.end();
[452]	2281
[485]	2282	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
	2283	{
[580]	2284	mMergeQueue.push(VspKdMergeCandidate(leaf, *nit));
[462]	2285	}
	2286	}
[483]	2287	}
	2288
	2289
[485]	2290	int VspKdTree::MergeViewCells(const VssRayContainer &rays)
[483]	2291	{
[485]	2292	CollectMergeCandidates();
	2293
[462]	2294	int merged = 0;
	2295
[485]	2296	int vcSize = mStat.Leaves();
[462]	2297	// use priority queue to merge leaves
[483]	2298	while (!mMergeQueue.empty() && (vcSize > mMergeMinViewCells) &&
	2299	(mMergeQueue.top().GetMergeCost() <
[580]	2300	mMergeMaxCostRatio * VspKdMergeCandidate::sOverallCost))
[462]	2301	{
[485]	2302	//Debug << "mergecost: " << mergeQueue.top().GetMergeCost() /
[580]	2303	//VspKdMergeCandidate::sOverallCost << " " << mMergeMaxCostRatio << endl;
	2304	VspKdMergeCandidate mc = mMergeQueue.top();
[483]	2305	mMergeQueue.pop();
[465]	2306
	2307	// both view cells equal!
[462]	2308	if (mc.GetLeaf1()->GetViewCell() == mc.GetLeaf2()->GetViewCell())
	2309	continue;
	2310
	2311	if (mc.Valid())
	2312	{
[465]	2313	ViewCell::NewMail();
	2314	MergeViewCells(mc.GetLeaf1(), mc.GetLeaf2());
[462]	2315
	2316	++ merged;
	2317	-- vcSize;
[472]	2318	// increase absolute merge cost
[580]	2319	VspKdMergeCandidate::sOverallCost += mc.GetMergeCost();
[452]	2320	}
[462]	2321	// merge candidate not valid, because one of the leaves was already
	2322	// merged with another one
[465]	2323	else
[462]	2324	{
	2325	// validate and reinsert into queue
	2326	mc.SetValid();
[483]	2327	mMergeQueue.push(mc);
[465]	2328	//Debug << "validate " << mc.GetMergeCost() << endl;
[462]	2329	}
[452]	2330	}
[462]	2331
[485]	2332	Debug << "merged " << merged << " of " << mStat.Leaves() << " leaves" << endl;
[465]	2333
[469]	2334	//TODO: should return sample contributions
[462]	2335	return merged;
[452]	2336	}
	2337
	2338
[517]	2339	void VspKdTree::RepairViewCellsLeafLists()
[589]	2340	{
[465]	2341	// list not valid anymore => clear
[589]	2342	stack<VspKdNode *> nodeStack;
	2343	nodeStack.push(mRoot);
	2344
	2345	ViewCell::NewMail();
	2346
	2347	while (!nodeStack.empty())
	2348	{
	2349	VspKdNode *node = nodeStack.top();
	2350	nodeStack.pop();
	2351
	2352	if (node->IsLeaf())
	2353	{
	2354	VspKdLeaf leaf = dynamic_cast<VspKdLeaf >(node);
	2355
	2356	VspKdViewCell *viewCell = leaf->GetViewCell();
[728]	2357	#if HAS_TO_BE_REDONE
[589]	2358	if (!viewCell->Mailed())
	2359	{
	2360	viewCell->mLeaves.clear();
	2361	viewCell->Mail();
	2362	}
	2363
	2364	viewCell->mLeaves.push_back(leaf);
	2365	#endif
	2366	}
	2367	else
	2368	{
	2369	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
	2370
	2371	nodeStack.push(interior->GetFront());
	2372	nodeStack.push(interior->GetBack());
	2373	}
[465]	2374	}
	2375	}
	2376
[479]	2377
[501]	2378	VspKdNode VspKdTree::CollapseTree(VspKdNode node, int &collapsed)
[465]	2379	{
[501]	2380	if (node->IsLeaf())
[465]	2381	return node;
	2382
[501]	2383	VspKdInterior interior = dynamic_cast<VspKdInterior >(node);
	2384
	2385	VspKdNode *front = CollapseTree(interior->GetFront(), collapsed);
	2386	VspKdNode *back = CollapseTree(interior->GetBack(), collapsed);
	2387
[465]	2388	if (front->IsLeaf() && back->IsLeaf())
	2389	{
	2390	VspKdLeaf frontLeaf = dynamic_cast<VspKdLeaf >(front);
	2391	VspKdLeaf backLeaf = dynamic_cast<VspKdLeaf >(back);
	2392
	2393	//-- collapse tree
	2394	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
	2395	{
	2396	VspKdViewCell *vc = frontLeaf->GetViewCell();
	2397
	2398	VspKdLeaf *leaf = new VspKdLeaf(interior->GetParent(), 0);
	2399	leaf->SetViewCell(vc);
[501]	2400	//leaf->SetTreeValid(frontLeaf->TreeValid());
[465]	2401
	2402	// replace a link from node's parent
[501]	2403	if (leaf->mParent)
	2404	{
	2405	// replace a link from node's parent
	2406	VspKdInterior *parent =
	2407	dynamic_cast<VspKdInterior *>(leaf->mParent);
[500]	2408	parent->ReplaceChildLink(node, leaf);
[501]	2409	}
	2410	++ collapsed;
[465]	2411	delete interior;
	2412
	2413	return leaf;
	2414	}
	2415	}
	2416
[495]	2417	return node;
	2418	}
	2419
	2420
[501]	2421	int VspKdTree::CollapseTree()
[495]	2422	{
[501]	2423	int collapsed = 0;
	2424	CollapseTree(mRoot, collapsed);
[485]	2425	// revalidate leaves
[517]	2426	RepairViewCellsLeafLists();
[501]	2427
	2428	return collapsed;
[465]	2429	}
	2430
[501]	2431
[486]	2432	int VspKdTree::RefineViewCells(const VssRayContainer &rays)
[473]	2433	{
[486]	2434	int shuffled = 0;
	2435
	2436	Debug << "refining " << (int)mMergeQueue.size() << " candidates " << endl;
	2437	BspLeaf::NewMail();
	2438
	2439	// Use priority queue of remaining leaf pairs
	2440	// These candidates either share the same view cells or
	2441	// are border leaves which share a boundary.
	2442	// We test if they can be shuffled, i.e.,
	2443	// either one leaf is made part of one view cell or the other
	2444	// leaf is made part of the other view cell. It is tested if the
	2445	// remaining view cells are "better" than the old ones.
	2446	while (!mMergeQueue.empty())
	2447	{
[580]	2448	VspKdMergeCandidate mc = mMergeQueue.top();
[486]	2449	mMergeQueue.pop();
	2450
	2451	// both view cells equal or already shuffled
	2452	if ((mc.GetLeaf1()->GetViewCell() == mc.GetLeaf2()->GetViewCell()) \|\|
	2453	(mc.GetLeaf1()->Mailed()) \|\| (mc.GetLeaf2()->Mailed()))
	2454	continue;
	2455
	2456	// candidate for shuffling
	2457	const bool wasShuffled = false;
	2458	//ShuffleLeaves(mc.GetLeaf1(), mc.GetLeaf2());
[495]	2459	// matt: restore
[486]	2460	//-- stats
	2461	if (wasShuffled)
	2462	++ shuffled;
	2463	}
	2464
	2465	return shuffled;
[473]	2466	}
	2467
	2468
[486]	2469	inline int AddedPvsSize(ObjectPvs pvs1, const ObjectPvs &pvs2)
	2470	{
	2471	return pvs1.AddPvs(pvs2);
	2472	}
	2473
	2474
	2475	inline int SubtractedPvsSize(ObjectPvs pvs1, const ObjectPvs &pvs2)
	2476	{
	2477	return pvs1.SubtractPvs(pvs2);
	2478	}
	2479
	2480
[580]	2481	float EvalShuffleCost(VspKdLeaf leaf, VspKdViewCell vc1, VspKdViewCell *vc2)
[486]	2482	{
	2483	const int pvs1 = SubtractedPvsSize(vc1->GetPvs(), *leaf->mPvs);
	2484	const int pvs2 = AddedPvsSize(vc2->GetPvs(), *leaf->mPvs);
	2485
[495]	2486	const float vol1 = vc1->GetVolume() - leaf->mVolume;
	2487	const float vol2 = vc2->GetVolume() + leaf->mVolume;
[486]	2488
[495]	2489	const float cost1 = pvs1 * vol1;
	2490	const float cost2 = pvs2 * vol2;
[486]	2491
	2492	return cost1 + cost2;
	2493	}
	2494
	2495
	2496	void VspKdTree::ShuffleLeaf(VspKdLeaf *leaf,
	2497	VspKdViewCell *vc1,
	2498	VspKdViewCell *vc2) const
	2499	{
	2500	// compute new pvs and area
[728]	2501	#if HAS_TO_BE_REDONE
[486]	2502	vc1->GetPvs().SubtractPvs(*leaf->mPvs);
	2503	vc2->GetPvs().AddPvs(*leaf->mPvs);
	2504
[495]	2505	vc1->SetArea(vc1->GetVolume() - leaf->mVolume);
	2506	vc2->SetArea(vc2->GetVolume() + leaf->mVolume);
[486]	2507
	2508	/// add to second view cell
	2509	vc2->mLeaves.push_back(leaf);
	2510
	2511	// erase leaf from old view cell
	2512	vector<VspKdLeaf *>::iterator it = vc1->mLeaves.begin();
	2513
	2514	for (; *it != leaf; ++ it);
	2515	vc1->mLeaves.erase(it);
	2516
	2517	leaf->SetViewCell(vc2); // finally change view cell
[580]	2518	#endif
[486]	2519	}
	2520
	2521
	2522	bool VspKdTree::ShuffleLeaves(VspKdLeaf leaf1, VspKdLeaf leaf2) const
	2523	{
	2524	VspKdViewCell *vc1 = leaf1->GetViewCell();
	2525	VspKdViewCell *vc2 = leaf2->GetViewCell();
	2526
	2527	const float cost1 = vc1->GetPvs().GetSize() * vc1->GetArea();
	2528	const float cost2 = vc2->GetPvs().GetSize() * vc2->GetArea();
	2529
	2530	const float oldCost = cost1 + cost2;
	2531
	2532	float shuffledCost1 = Limits::Infinity;
	2533	float shuffledCost2 = Limits::Infinity;
	2534
	2535	// the view cell should not be empty after the shuffle
[580]	2536	//todo
	2537	/* if (vc1->mLeaves.size() > 1)
	2538	shuffledCost1 = EvalShuffleCost(leaf1, vc1, vc2);
[486]	2539	if (vc2->mLeaves.size() > 1)
[580]	2540	shuffledCost2 = EvalShuffleCost(leaf2, vc2, vc1);
[486]	2541
[580]	2542	*/ // shuffling unsuccessful
[486]	2543	if ((oldCost <= shuffledCost1) && (oldCost <= shuffledCost2))
	2544	return false;
	2545
	2546	if (shuffledCost1 < shuffledCost2)
	2547	{
	2548	ShuffleLeaf(leaf1, vc1, vc2);
	2549	leaf1->Mail();
	2550	}
	2551	else
	2552	{
	2553	ShuffleLeaf(leaf2, vc2, vc1);
	2554	leaf2->Mail();
	2555	}
	2556
	2557	return true;
	2558	}
	2559
	2560
	2561
	2562
[452]	2563	/*********************************************************************/
[580]	2564	/* VspKdMergeCandidate implementation */
[452]	2565	/*********************************************************************/
	2566
	2567
[580]	2568	VspKdMergeCandidate::VspKdMergeCandidate(VspKdLeaf l1, VspKdLeaf l2):
[462]	2569	mMergeCost(0),
	2570	mLeaf1(l1),
	2571	mLeaf2(l2),
	2572	mLeaf1Id(l1->GetViewCell()->mMailbox),
	2573	mLeaf2Id(l2->GetViewCell()->mMailbox)
	2574	{
	2575	EvalMergeCost();
	2576	}
[452]	2577
[580]	2578	float VspKdMergeCandidate::GetLeaf1Cost() const
[472]	2579	{
	2580	VspKdViewCell *vc = mLeaf1->GetViewCell();
	2581	return vc->GetPvs().GetSize() * vc->GetVolume();
	2582	}
[462]	2583
[580]	2584	float VspKdMergeCandidate::GetLeaf2Cost() const
[472]	2585	{
	2586	VspKdViewCell *vc = mLeaf2->GetViewCell();
	2587	return vc->GetPvs().GetSize() * vc->GetVolume();
	2588	}
	2589
[580]	2590	void VspKdMergeCandidate::EvalMergeCost()
[452]	2591	{
[465]	2592	//-- compute pvs difference
[463]	2593	VspKdViewCell *vc1 = mLeaf1->GetViewCell();
[462]	2594	VspKdViewCell *vc2 = mLeaf2->GetViewCell();
[452]	2595
[463]	2596	const int diff1 = vc1->GetPvs().Diff(vc2->GetPvs());
[462]	2597	const int vcPvs = diff1 + vc1->GetPvs().GetSize();
[453]	2598
[465]	2599	//-- compute ratio of old cost
[462]	2600	//-- (added size of left and right view cell times pvs size)
	2601	//-- to new rendering cost (size of merged view cell times pvs size)
[472]	2602	const float oldCost = GetLeaf1Cost() + GetLeaf2Cost();
	2603
[465]	2604	const float newCost =
[469]	2605	(float)vcPvs * (vc1->GetVolume() + vc2->GetVolume());
[453]	2606
[465]	2607	mMergeCost = newCost - oldCost;
[462]	2608
[465]	2609	// if (vcPvs > sMaxPvsSize) // strong penalty if pvs size too large
	2610	// mMergeCost += 1.0;
[462]	2611	}
	2612
[580]	2613	void VspKdMergeCandidate::SetLeaf1(VspKdLeaf *l)
[462]	2614	{
	2615	mLeaf1 = l;
	2616	}
	2617
[580]	2618	void VspKdMergeCandidate::SetLeaf2(VspKdLeaf *l)
[462]	2619	{
	2620	mLeaf2 = l;
	2621	}
	2622
[482]	2623
[580]	2624	VspKdLeaf *VspKdMergeCandidate::GetLeaf1()
[462]	2625	{
	2626	return mLeaf1;
	2627	}
	2628
[482]	2629
[580]	2630	VspKdLeaf *VspKdMergeCandidate::GetLeaf2()
[462]	2631	{
	2632	return mLeaf2;
	2633	}
	2634
[482]	2635
[580]	2636	bool VspKdMergeCandidate::Valid() const
[465]	2637	{
	2638	return
	2639	(mLeaf1->GetViewCell()->mMailbox == mLeaf1Id) &&
[462]	2640	(mLeaf2->GetViewCell()->mMailbox == mLeaf2Id);
	2641	}
	2642
[482]	2643
[580]	2644	float VspKdMergeCandidate::GetMergeCost() const
[462]	2645	{
	2646	return mMergeCost;
	2647	}
	2648
[482]	2649
[580]	2650	void VspKdMergeCandidate::SetValid()
[462]	2651	{
	2652	mLeaf1Id = mLeaf1->GetViewCell()->mMailbox;
	2653	mLeaf2Id = mLeaf2->GetViewCell()->mMailbox;
[465]	2654
[462]	2655	EvalMergeCost();
[463]	2656	}
[860]	2657
	2658	}

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