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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 2124

Revision 2124, 98.6 KB checked in by mattausch, 18 years ago (diff)

Rev	Line
[478]	1	#include <stack>
	2	#include <time.h>
	3	#include <iomanip>
	4
[463]	5	#include "Plane3.h"
	6	#include "VspBspTree.h"
	7	#include "Mesh.h"
	8	#include "common.h"
	9	#include "ViewCell.h"
	10	#include "Environment.h"
	11	#include "Polygon3.h"
	12	#include "Ray.h"
	13	#include "AxisAlignedBox3.h"
	14	#include "Exporter.h"
	15	#include "Plane3.h"
	16	#include "ViewCellBsp.h"
[478]	17	#include "ViewCellsManager.h"
[532]	18	#include "Beam.h"
[1603]	19	#include "IntersectableWrapper.h"
[463]	20
[1077]	21
	22
[863]	23	namespace GtpVisibilityPreprocessor {
[860]	24
[1077]	25
[639]	26	#define USE_FIXEDPOINT_T 0
[1020]	27	#define COUNT_ORIGIN_OBJECTS 1
[590]	28
[2072]	29	#define STORE_PVS 0
[1580]	30
[2066]	31
[1580]	32	//////////////
[463]	33	//-- static members
[508]	34
[482]	35	int VspBspTree::sFrontId = 0;
[463]	36	int VspBspTree::sBackId = 0;
	37	int VspBspTree::sFrontAndBackId = 0;
	38
[1020]	39
	40
[697]	41	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
[463]	42
[557]	43
[579]	44	// pvs penalty can be different from pvs size
[1765]	45	inline static float EvalPvsPenalty(const float pvs,
	46	const float lower,
	47	const float upper)
[579]	48	{
	49	// clamp to minmax values
	50	if (pvs < lower)
	51	return (float)lower;
	52	if (pvs > upper)
	53	return (float)upper;
[578]	54
[579]	55	return (float)pvs;
	56	}
[463]	57
[557]	58
[579]	59
	60
[601]	61	/******************************************************************************/
	62	/* class VspBspTree implementation */
	63	/******************************************************************************/
[579]	64
	65
[1004]	66	VspBspTree::VspBspTree():
[463]	67	mRoot(NULL),
[547]	68	mUseAreaForPvs(false),
[478]	69	mCostNormalizer(Limits::Small),
	70	mViewCellsManager(NULL),
[497]	71	mOutOfBoundsCell(NULL),
[643]	72	mStoreRays(false),
[605]	73	mRenderCostWeight(0.5),
[610]	74	mUseRandomAxis(false),
[650]	75	mTimeStamp(1)
[463]	76	{
[486]	77	bool randomize = false;
[1004]	78	Environment::GetSingleton()->GetBoolValue("VspBspTree.Construction.randomize", randomize);
[1011]	79	if (randomize) Randomize(); // initialise random generator for heuristics
[463]	80
[1557]	81	//////////////////
[463]	82	//-- termination criteria for autopartition
[1557]	83
[1004]	84	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.maxDepth", mTermMaxDepth);
	85	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.minPvs", mTermMinPvs);
	86	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.minRays", mTermMinRays);
	87	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minProbability", mTermMinProbability);
	88	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.maxRayContribution", mTermMaxRayContribution);
	89	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
[1023]	90
[1004]	91	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.missTolerance", mTermMissTolerance);
	92	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.maxViewCells", mMaxViewCells);
[666]	93
[1557]	94	////////////////////////
	95	//-- cost ratios for early tree termination
[1004]	96	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
	97	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
	98	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
[610]	99
[1557]	100	///////////
[463]	101	//-- factors for bsp tree split plane heuristics
[1557]	102
[1004]	103	Environment::GetSingleton()->GetFloatValue("VspBspTree.Factor.pvs", mPvsFactor);
	104	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.ct_div_ci", mCtDivCi);
[463]	105
[1557]	106	//////////
	107	//-- partition criteria
[482]	108
[1004]	109	Environment::GetSingleton()->GetIntValue("VspBspTree.maxPolyCandidates", mMaxPolyCandidates);
	110	Environment::GetSingleton()->GetIntValue("VspBspTree.maxRayCandidates", mMaxRayCandidates);
	111	Environment::GetSingleton()->GetIntValue("VspBspTree.splitPlaneStrategy", mSplitPlaneStrategy);
[463]	112
[1004]	113	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.epsilon", mEpsilon);
	114	Environment::GetSingleton()->GetIntValue("VspBspTree.maxTests", mMaxTests);
[463]	115
[564]	116	// if only the driving axis is used for axis aligned split
[1004]	117	Environment::GetSingleton()->GetBoolValue("VspBspTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
[580]	118
[1557]	119	//////////////////////
[508]	120	//-- termination criteria for axis aligned split
[1004]	121	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
[665]	122	mTermMaxRayContriForAxisAligned);
[1004]	123	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
[665]	124	mTermMinRaysForAxisAligned);
[487]	125
[1004]	126	Environment::GetSingleton()->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
[508]	127
[1004]	128	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
[1020]	129	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
[1004]	130	Environment::GetSingleton()->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
[547]	131
[1004]	132	Environment::GetSingleton()->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
	133	Environment::GetSingleton()->GetBoolValue("VspBspTree.useSplitCostQueue", mUseSplitCostQueue);
	134	Environment::GetSingleton()->GetBoolValue("VspBspTree.simulateOctree", mCirculatingAxis);
	135	Environment::GetSingleton()->GetBoolValue("VspBspTree.useRandomAxis", mUseRandomAxis);
	136	Environment::GetSingleton()->GetIntValue("VspBspTree.nodePriorityQueueType", mNodePriorityQueueType);
[580]	137
[676]	138
[660]	139	char subdivisionStatsLog[100];
[1004]	140	Environment::GetSingleton()->GetStringValue("VspBspTree.subdivisionStats", subdivisionStatsLog);
[660]	141	mSubdivisionStats.open(subdivisionStatsLog);
[612]	142
[1004]	143	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.minBand", mMinBand);
	144	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.maxBand", mMaxBand);
[1006]	145	Environment::GetSingleton()->GetBoolValue("VspBspTree.Construction.useDrivingAxisForMaxCost", mUseDrivingAxisIfMaxCostViolated);
[801]	146
[1557]	147	/////////
[478]	148	//-- debug output
[580]	149
[473]	150	Debug << "***** VSP BSP options ****** " << endl;
	151	Debug << "max depth: " << mTermMaxDepth << endl;
	152	Debug << "min PVS: " << mTermMinPvs << endl;
[547]	153	Debug << "min probabiliy: " << mTermMinProbability << endl;
[473]	154	Debug << "min rays: " << mTermMinRays << endl;
	155	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
	156	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
	157	Debug << "miss tolerance: " << mTermMissTolerance << endl;
	158	Debug << "max view cells: " << mMaxViewCells << endl;
	159	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
[486]	160	Debug << "randomize: " << randomize << endl;
[582]	161
[551]	162	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
[580]	163	Debug << "render cost weight: " << mRenderCostWeight << endl;
[663]	164	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
	165	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
	166	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
	167	Debug << "max memory: " << mMaxMemory << endl;
	168	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
	169	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
	170	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
	171	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
[664]	172	Debug << "use random axis: " << mUseRandomAxis << endl;
[735]	173	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
[822]	174	Debug << "circulating axis: " << mCirculatingAxis << endl;
[801]	175	Debug << "minband: " << mMinBand << endl;
	176	Debug << "maxband: " << mMaxBand << endl;
[1006]	177	Debug << "use driving axis for max cost: " << mUseDrivingAxisIfMaxCostViolated << endl;
[1020]	178	Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
[663]	179
[463]	180	Debug << "Split plane strategy: ";
[564]	181
[463]	182	if (mSplitPlaneStrategy & RANDOM_POLYGON)
[474]	183	{
[463]	184	Debug << "random polygon ";
[474]	185	}
[463]	186	if (mSplitPlaneStrategy & AXIS_ALIGNED)
[472]	187	{
[463]	188	Debug << "axis aligned ";
[472]	189	}
[665]	190	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
[472]	191	{
[474]	192	mCostNormalizer += mLeastRaySplitsFactor;
[463]	193	Debug << "least ray splits ";
[472]	194	}
[463]	195	if (mSplitPlaneStrategy & BALANCED_RAYS)
[472]	196	{
[474]	197	mCostNormalizer += mBalancedRaysFactor;
[463]	198	Debug << "balanced rays ";
[472]	199	}
[463]	200	if (mSplitPlaneStrategy & PVS)
[472]	201	{
[474]	202	mCostNormalizer += mPvsFactor;
[463]	203	Debug << "pvs";
[665]	204	}
[482]	205
[1557]	206	Debug << endl;
[489]	207
[1233]	208	mLocalSubdivisionCandidates = new vector<SortableEntry>;
[463]	209	}
[580]	210
[1027]	211
[508]	212	BspViewCell *VspBspTree::GetOutOfBoundsCell()
	213	{
	214	return mOutOfBoundsCell;
	215	}
[463]	216
[508]	217
[489]	218	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
	219	{
	220	if (!mOutOfBoundsCell)
[508]	221	{
[489]	222	mOutOfBoundsCell = new BspViewCell();
[1557]	223	mOutOfBoundsCell->SetId(OUT_OF_BOUNDS_ID);
[547]	224	mOutOfBoundsCell->SetValid(false);
[508]	225	}
[547]	226
[489]	227	return mOutOfBoundsCell;
	228	}
	229
	230
[482]	231	const BspTreeStatistics &VspBspTree::GetStatistics() const
[463]	232	{
[574]	233	return mBspStats;
[463]	234	}
	235
	236
	237	VspBspTree::~VspBspTree()
	238	{
	239	DEL_PTR(mRoot);
[1233]	240	DEL_PTR(mLocalSubdivisionCandidates);
[463]	241	}
	242
[579]	243
[482]	244	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
[1632]	245	PolygonContainer &polys) const
[463]	246	{
[1632]	247	if (!mesh) return 0;
[1603]	248
[463]	249	FaceContainer::const_iterator fi;
[482]	250
[463]	251	// copy the face data to polygons
	252	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
	253	{
	254	Polygon3 poly = new Polygon3((fi), mesh);
[482]	255
[463]	256	if (poly->Valid(mEpsilon))
	257	{
	258	polys.push_back(poly);
	259	}
	260	else
[1558]	261	{
[463]	262	DEL_PTR(poly);
[1558]	263	}
[463]	264	}
[1603]	265
[463]	266	return (int)mesh->mFaces.size();
	267	}
	268
[580]	269
[1632]	270	void VspBspTree::ExtractPolygons(Intersectable *object, PolygonContainer &polys) const
[463]	271	{
[1632]	272	// extract the polygons from the intersectables
	273	switch (object->Type())
[463]	274	{
	275	case Intersectable::MESH_INSTANCE:
[1632]	276	{
[2017]	277	Mesh mesh = static_cast<MeshInstance >(object)->GetMesh();
[1632]	278	AddMeshToPolygons(mesh, polys);
	279	}
[463]	280	break;
	281	case Intersectable::VIEW_CELL:
[1632]	282	{
[2017]	283	Mesh mesh = static_cast<ViewCell >(object)->GetMesh();
[1632]	284	AddMeshToPolygons(mesh, polys);
	285	break;
	286	}
[1001]	287	case Intersectable::TRANSFORMED_MESH_INSTANCE:
	288	{
[1603]	289	TransformedMeshInstance *mi =
[2017]	290	static_cast<TransformedMeshInstance *>(object);
[1001]	291
[1603]	292	Mesh mesh;
	293	mi->GetTransformedMesh(mesh);
[1632]	294	AddMeshToPolygons(&mesh, polys);
[1001]	295	}
[1632]	296	break;
[1603]	297	case Intersectable::TRIANGLE_INTERSECTABLE:
	298	{
	299	TriangleIntersectable *intersect =
[2017]	300	static_cast<TriangleIntersectable *>(object);
[1603]	301
	302	Polygon3 *poly = new Polygon3(intersect->GetItem());
	303
	304	if (poly->Valid(mEpsilon))
[1632]	305	{
[1603]	306	polys.push_back(poly);
[1632]	307	}
[1603]	308	else
[1632]	309	{
[1603]	310	delete poly;
[1632]	311	}
[1603]	312	}
[1632]	313	break;
[463]	314	default:
[1632]	315	Debug << "intersectable type not supported" << endl;
[463]	316	break;
[1632]	317	}
	318	}
[482]	319
[1632]	320
	321	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
	322	PolygonContainer &polys,
	323	int maxObjects)
	324	{
	325	const int limit = (maxObjects > 0) ?
	326	Min((int)objects.size(), maxObjects) : (int)objects.size();
	327
	328	for (int i = 0; i < limit; ++i)
	329	{
	330	Intersectable object = objects[i];//it;
	331	ExtractPolygons(object, polys);
	332
[2070]	333	// add to BSP tree aabb
	334	mBoundingBox.Include(object->GetBox());
[463]	335	}
	336
	337	return (int)polys.size();
	338	}
	339
[580]	340
[1027]	341	void VspBspTree::ComputeBoundingBox(const VssRayContainer &sampleRays,
	342	AxisAlignedBox3 *forcedBoundingBox)
	343	{
	344	if (forcedBoundingBox)
	345	{
[1563]	346	mBoundingBox = *forcedBoundingBox;
[1027]	347	}
	348	else // compute vsp tree bounding box
	349	{
[1563]	350	mBoundingBox.Initialize();
[1027]	351
	352	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
	353
	354	//-- compute bounding box
	355	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	356	{
	357	VssRay ray = rit;
	358
	359	// compute bounding box of view space
[1563]	360	mBoundingBox.Include(ray->GetTermination());
	361	mBoundingBox.Include(ray->GetOrigin());
[1027]	362	}
	363	}
	364	}
	365
	366
[483]	367	void VspBspTree::Construct(const VssRayContainer &sampleRays,
	368	AxisAlignedBox3 *forcedBoundingBox)
[463]	369	{
[1027]	370	// Compute the bounding box from the rays
	371	ComputeBoundingBox(sampleRays, forcedBoundingBox);
[484]	372
[463]	373	PolygonContainer polys;
	374	RayInfoContainer *rays = new RayInfoContainer();
	375
[1564]	376	////////////
	377	//-- extract polygons from rays if polygon candidate planes are required
	378
[1027]	379	if (mMaxPolyCandidates)
	380	{
	381	int numObj = 0;
	382	Intersectable::NewMail();
[463]	383
[1027]	384	cout << "Extracting polygons from rays ... ";
[1580]	385	const long startTime = GetTime();
[463]	386
[1027]	387	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
[542]	388
[1027]	389	//-- extract polygons intersected by the rays
	390	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
[463]	391	{
[1027]	392	VssRay ray = rit;
	393	Intersectable *obj = ray->mTerminationObject;
[1002]	394
[1632]	395	++ numObj;
[1027]	396
[1632]	397	/////////
	398	//-- compute bounding box
[1603]	399
[1632]	400	if (!forcedBoundingBox)
	401	{
	402	mBoundingBox.Include(ray->mTermination);
[1002]	403	}
[1027]	404
[1563]	405	if ((mBoundingBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
[1027]	406	ray->mOriginObject &&
	407	!ray->mOriginObject->Mailed())
	408	{
	409	ray->mOriginObject->Mail();
[1632]	410	ExtractPolygons(ray->mOriginObject, polys);
	411
[1027]	412	++ numObj;
[1002]	413	}
[1027]	414	}
[1002]	415
[1027]	416	// throw out unnecessary polygons
	417	PreprocessPolygons(polys);
	418	cout << "finished" << endl;
[463]	419
[1027]	420	Debug << "\n" << (int)polys.size() << " polys extracted from "
	421	<< (int)sampleRays.size() << " rays in "
	422	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
[463]	423	}
[535]	424
[1027]	425	Debug << "maximal pvs (i.e., pvs still considered as valid): "
[653]	426	<< mViewCellsManager->GetMaxPvsSize() << endl;
[580]	427
[1027]	428	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
	429
[2070]	430	/////////
[463]	431	//-- store rays
	432	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	433	{
	434	VssRay ray = rit;
[482]	435
[463]	436	float minT, maxT;
	437
[564]	438	static Ray hray;
	439	hray.Init(*ray);
[562]	440
[483]	441	// TODO: not very efficient to implictly cast between rays types
[1563]	442	if (mBoundingBox.GetRaySegment(hray, minT, maxT))
[463]	443	{
	444	float len = ray->Length();
[482]	445
	446	if (!len)
[463]	447	len = Limits::Small;
[482]	448
[463]	449	rays->push_back(RayInfo(ray, minT / len, maxT / len));
	450	}
	451	}
	452
[547]	453	if (mUseAreaForPvs)
[1563]	454	mTermMinProbability *= mBoundingBox.SurfaceArea();
[2072]	455	else // normalize volume
[1563]	456	mTermMinProbability *= mBoundingBox.GetVolume();
[547]	457
[1027]	458	mBspStats.nodes = 1;
[574]	459	mBspStats.polys = (int)polys.size();
[1449]	460	mBspStats.mGlobalCostMisses = 0;
[654]	461
[463]	462
[655]	463	// use split cost priority queue
	464	if (mUseSplitCostQueue)
	465	{
[654]	466	ConstructWithSplitQueue(polys, rays);
[655]	467	}
[654]	468	else
[655]	469	{
[654]	470	Construct(polys, rays);
[655]	471	}
[463]	472
	473	// clean up polygons
	474	CLEAR_CONTAINER(polys);
	475	}
	476
[508]	477
[612]	478	// TODO: return memory usage in MB
[656]	479	float VspBspTree::GetMemUsage() const
[508]	480	{
[656]	481	return (float)
	482	(sizeof(VspBspTree) +
	483	mBspStats.Leaves() * sizeof(BspLeaf) +
	484	mCreatedViewCells * sizeof(BspViewCell) +
[1189]	485	mBspStats.pvs * sizeof(PvsData) +
[656]	486	mBspStats.Interior() * sizeof(BspInterior) +
	487	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
[508]	488	}
	489
	490
[463]	491	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
	492	{
[600]	493	VspBspTraversalQueue tQueue;
[463]	494
[1016]	495	/// create new vsp tree
[463]	496	mRoot = new BspLeaf();
	497
	498	// constrruct root node geometry
	499	BspNodeGeometry *geom = new BspNodeGeometry();
	500	ConstructGeometry(mRoot, *geom);
	501
[1016]	502	/// we use the overall probability as normalizer
	503	/// either the overall area or the volume
[547]	504	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
	505
[1020]	506	/// first traversal data
[482]	507	VspBspTraversalData tData(mRoot,
	508	new PolygonContainer(polys),
[463]	509	0,
[482]	510	rays,
	511	ComputePvsSize(*rays),
[547]	512	prop,
[463]	513	geom);
[663]	514
[1302]	515	// evaluate the priority of this traversal data
[664]	516	EvalPriority(tData);
[663]	517
[578]	518	// first node is kd node, i.e. an axis aligned box
[710]	519	if (1)
[578]	520	tData.mIsKdNode = true;
	521	else
	522	tData.mIsKdNode = false;
[562]	523
[600]	524	tQueue.push(tData);
[463]	525
[609]	526
[1563]	527	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
[607]	528	mTotalPvsSize = tData.mPvs;
	529
[1020]	530	// first subdivison statistics
	531	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
	532
[574]	533	mBspStats.Start();
[667]	534	cout << "Constructing vsp bsp tree ... \n";
[463]	535
[1016]	536	const long startTime = GetTime();
	537	// used for intermediate time measurements and progress
	538	long interTime = GetTime();
	539
[664]	540	int nLeaves = 500;
	541	int nViewCells = 500;
[587]	542
[542]	543	mOutOfMemory = false;
[612]	544	mCreatedViewCells = 0;
	545
[600]	546	while (!tQueue.empty())
[463]	547	{
[600]	548	tData = tQueue.top();
	549	tQueue.pop();
[463]	550
[508]	551	if (0 && !mOutOfMemory)
	552	{
	553	float mem = GetMemUsage();
[478]	554
[508]	555	if (mem > mMaxMemory)
	556	{
	557	mOutOfMemory = true;
	558	Debug << "memory limit reached: " << mem << endl;
	559	}
	560	}
	561
[587]	562	// subdivide leaf node
[1016]	563	const BspNode *r = Subdivide(tQueue, tData);
[463]	564
	565	if (r == mRoot)
[482]	566	Debug << "VSP BSP tree construction time spent at root: "
[542]	567	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
	568
[654]	569	if (mBspStats.Leaves() >= nLeaves)
[542]	570	{
[612]	571	nLeaves += 500;
	572
[574]	573	cout << "leaves=" << mBspStats.Leaves() << endl;
[542]	574	Debug << "needed "
[587]	575	<< TimeDiff(interTime, GetTime())*1e-3
[612]	576	<< " secs to create 500 view cells" << endl;
[542]	577	interTime = GetTime();
	578	}
[612]	579
[664]	580	if (mCreatedViewCells >= nViewCells)
[612]	581	{
	582	nViewCells += 500;
	583
	584	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
	585	}
[463]	586	}
	587
[542]	588	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
[1020]	589	cout << "finished in " << TimeDiff(startTime, GetTime())*1e-3 << "secs" << endl;
[463]	590
[574]	591	mBspStats.Stop();
[463]	592	}
	593
[508]	594
[653]	595
[654]	596	void VspBspTree::ConstructWithSplitQueue(const PolygonContainer &polys,
[653]	597	RayInfoContainer *rays)
	598	{
	599	VspBspSplitQueue tQueue;
	600
	601	mRoot = new BspLeaf();
	602
	603	// constrruct root node geometry
	604	BspNodeGeometry *geom = new BspNodeGeometry();
	605	ConstructGeometry(mRoot, *geom);
	606
	607	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
	608
	609	VspBspTraversalData tData(mRoot,
	610	new PolygonContainer(polys),
	611	0,
	612	rays,
	613	ComputePvsSize(*rays),
	614	prop,
	615	geom);
	616
[663]	617
[1076]	618	// first node is kd node, i.e. an axis aligned box
	619	if (1)
	620	tData.mIsKdNode = true;
	621	else
	622	tData.mIsKdNode = false;
	623
[660]	624	// compute first split candidate
[1233]	625	VspBspSubdivisionCandidate splitCandidate;
[1145]	626	splitCandidate.mParentData = tData;
[653]	627
[1233]	628	EvalSubdivisionCandidate(splitCandidate);
[1145]	629
[653]	630	tQueue.push(splitCandidate);
	631
[1563]	632	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
[653]	633	mTotalPvsSize = tData.mPvs;
	634
[1020]	635	// first subdivison statistics
	636	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
	637
	638	mBspStats.Start();
[667]	639	cout << "Constructing vsp bsp tree ... \n";
[653]	640
	641	long startTime = GetTime();
[666]	642	int nLeaves = 500;
	643	int nViewCells = 500;
[653]	644
	645	// used for intermediate time measurements and progress
	646	long interTime = GetTime();
	647
	648	mOutOfMemory = false;
	649
	650	mCreatedViewCells = 0;
	651
	652	while (!tQueue.empty())
	653	{
	654	splitCandidate = tQueue.top();
	655	tQueue.pop();
	656
[654]	657	// cost ratio of cost decrease / totalCost
[1288]	658	float costRatio = splitCandidate.mRenderCostDecr / mTotalCost;
[654]	659
[655]	660	//Debug << "cost ratio: " << costRatio << endl;
[654]	661	if (costRatio < mTermMinGlobalCostRatio)
[1449]	662	{
	663	++ mBspStats.mGlobalCostMisses;
	664	}
	665
[653]	666	if (0 && !mOutOfMemory)
	667	{
	668	float mem = GetMemUsage();
	669	if (mem > mMaxMemory)
	670	{
	671	mOutOfMemory = true;
	672	Debug << "memory limit reached: " << mem << endl;
	673	}
	674	}
	675
	676	// subdivide leaf node
	677	BspNode *r = Subdivide(tQueue, splitCandidate);
	678
	679	if (r == mRoot)
[1449]	680	{
[2069]	681	cout << "VSP BSP tree construction time spent at root: "
	682	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
[1449]	683	}
[653]	684
[654]	685	if (mBspStats.Leaves() >= nLeaves)
[653]	686	{
	687	nLeaves += 500;
	688
	689	cout << "leaves=" << mBspStats.Leaves() << endl;
	690	Debug << "needed "
	691	<< TimeDiff(interTime, GetTime())*1e-3
	692	<< " secs to create 500 view cells" << endl;
	693	interTime = GetTime();
	694	}
	695
	696	if (mCreatedViewCells == nViewCells)
	697	{
	698	nViewCells += 500;
	699	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
	700	}
	701	}
	702
	703	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
	704	cout << "finished\n";
	705
	706	mBspStats.Stop();
	707	}
	708
	709
[654]	710	bool VspBspTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
[463]	711	{
[482]	712	return
[463]	713	(((int)data.mRays->size() <= mTermMinRays) \|\|
[473]	714	(data.mPvs <= mTermMinPvs) \|\|
[547]	715	(data.mProbability <= mTermMinProbability) \|\|
[535]	716	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
[463]	717	(data.mDepth >= mTermMaxDepth));
	718	}
	719
[508]	720
[1020]	721	void VspBspTree::AddSubdivisionStats(const int viewCells,
	722	const float renderCostDecr,
	723	const float splitCandidateCost,
	724	const float totalRenderCost,
	725	const float avgRenderCost)
	726	{
	727	mSubdivisionStats
	728	<< "#ViewCells\n" << viewCells << endl
	729	<< "#RenderCostDecrease\n" << renderCostDecr << endl
[1233]	730	<< "#SubdivisionCandidateCost\n" << splitCandidateCost << endl
[1020]	731	<< "#TotalRenderCost\n" << totalRenderCost << endl
	732	<< "#AvgRenderCost\n" << avgRenderCost << endl;
	733	}
	734
	735
[654]	736	bool VspBspTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
	737	{
	738	return
[1302]	739	(0
	740	\|\| mOutOfMemory
[654]	741	\|\| (mBspStats.Leaves() >= mMaxViewCells)
[1449]	742	\|\| (mBspStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
[654]	743	);
	744	}
	745
	746
[600]	747	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
[463]	748	VspBspTraversalData &tData)
	749	{
[473]	750	BspNode *newNode = tData.mNode;
	751
[654]	752	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
[473]	753	{
	754	PolygonContainer coincident;
[482]	755
[473]	756	VspBspTraversalData tFrontData;
	757	VspBspTraversalData tBackData;
[612]	758
[473]	759	// create new interior node and two leaf nodes
	760	// or return leaf as it is (if maxCostRatio missed)
[653]	761	int splitAxis;
	762	bool splitFurther = true;
	763	int maxCostMisses = tData.mMaxCostMisses;
	764
	765	Plane3 splitPlane;
[2017]	766	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
[726]	767
	768	// choose next split plane
[653]	769	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
[473]	770	{
[653]	771	++ maxCostMisses;
	772
	773	if (maxCostMisses > mTermMissTolerance)
	774	{
	775	// terminate branch because of max cost
	776	++ mBspStats.maxCostNodes;
	777	splitFurther = false;
	778	}
	779	}
	780
[726]	781	// if this a valid split => subdivide this node further
[1193]	782
	783	if (splitFurther)
[653]	784	{
	785	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
	786
	787	if (splitAxis < 3)
	788	++ mBspStats.splits[splitAxis];
	789	else
	790	++ mBspStats.polySplits;
	791
[822]	792	// if it was a kd node (i.e., a box) and the split axis is axis aligned, it is still a kd node
[710]	793	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
[1076]	794
[726]	795	tFrontData.mAxis = tBackData.mAxis = splitAxis;
[663]	796
[653]	797	// how often was max cost ratio missed in this branch?
	798	tFrontData.mMaxCostMisses = maxCostMisses;
	799	tBackData.mMaxCostMisses = maxCostMisses;
	800
[664]	801	EvalPriority(tFrontData);
	802	EvalPriority(tBackData);
[663]	803
[726]	804	// evaluate subdivision stats
[600]	805	if (1)
[1145]	806	EvalSubdivisionStats(tData, tFrontData, tBackData);
	807
[605]	808
[473]	809	// push the children on the stack
[600]	810	tQueue.push(tFrontData);
	811	tQueue.push(tBackData);
[473]	812
	813	// delete old leaf node
[482]	814	DEL_PTR(tData.mNode);
[473]	815	}
	816	}
[482]	817
[478]	818	//-- terminate traversal and create new view cell
[473]	819	if (newNode->IsLeaf())
[463]	820	{
[2017]	821	BspLeaf leaf = static_cast<BspLeaf >(newNode);
[1020]	822
[547]	823	BspViewCell *viewCell = new BspViewCell();
[463]	824	leaf->SetViewCell(viewCell);
[487]	825
[2066]	826	if (STORE_PVS)
	827	{
	828	//////////
	829	//-- update pvs
[487]	830
[2066]	831	int conSamp = 0;
	832	float sampCon = 0.0f;
[752]	833
[2066]	834	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
[487]	835
[2066]	836	// update scalar pvs size lookup
	837	ObjectPvs &pvs = viewCell->GetPvs();
	838	mViewCellsManager->UpdateScalarPvsSize(viewCell, pvs.EvalPvsCost(), pvs.GetSize());
	839
	840	mBspStats.contributingSamples += conSamp;
	841	mBspStats.sampleContributions += (int)sampCon;
	842	}
	843
	844	//////////
[487]	845	//-- store additional info
[2066]	846
[478]	847	if (mStoreRays)
	848	{
	849	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
	850	for (it = tData.mRays->begin(); it != it_end; ++ it)
[639]	851	{
	852	(*it).mRay->Ref();
[478]	853	leaf->mVssRays.push_back((*it).mRay);
[639]	854	}
[478]	855	}
[612]	856
[564]	857	// should I check here?
[1027]	858	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0,
	859	mViewCellsManager->GetMaxPvsSize()))
[547]	860	{
	861	viewCell->SetValid(false);
	862	leaf->SetTreeValid(false);
	863	PropagateUpValidity(leaf);
[463]	864
[574]	865	++ mBspStats.invalidLeaves;
[547]	866	}
	867
[1551]	868	viewCell->mLeaves.push_back(leaf);
[547]	869
	870	if (mUseAreaForPvs)
	871	viewCell->SetArea(tData.mProbability);
	872	else
	873	viewCell->SetVolume(tData.mProbability);
	874
	875	leaf->mProbability = tData.mProbability;
	876
[1020]	877	// finally evaluate stats until this leaf
[1027]	878	if (0)
	879	EvaluateLeafStats(tData);
[463]	880	}
[482]	881
[473]	882	//-- cleanup
[478]	883	tData.Clear();
[463]	884
[472]	885	return newNode;
[463]	886	}
	887
[1027]	888
	889	// subdivide node using a split plane queue
[653]	890	BspNode *VspBspTree::Subdivide(VspBspSplitQueue &tQueue,
[1233]	891	VspBspSubdivisionCandidate &splitCandidate)
[653]	892	{
	893	VspBspTraversalData &tData = splitCandidate.mParentData;
	894
	895	BspNode *newNode = tData.mNode;
	896
[654]	897	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
[666]	898	{
[653]	899	PolygonContainer coincident;
	900
	901	VspBspTraversalData tFrontData;
	902	VspBspTraversalData tBackData;
	903
[1586]	904	////////////////////
[653]	905	//-- continue subdivision
[726]	906
[653]	907	// create new interior node and two leaf node
	908	const Plane3 splitPlane = splitCandidate.mSplitPlane;
[654]	909
[653]	910	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
[666]	911
[660]	912	const int splitAxis = splitCandidate.mSplitAxis;
	913	const int maxCostMisses = splitCandidate.mMaxCostMisses;
	914
[654]	915	if (splitAxis < 3)
	916	++ mBspStats.splits[splitAxis];
	917	else
	918	++ mBspStats.polySplits;
[653]	919
[710]	920	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
[726]	921	tFrontData.mAxis = tBackData.mAxis = splitAxis;
	922
[654]	923	// how often was max cost ratio missed in this branch?
	924	tFrontData.mMaxCostMisses = maxCostMisses;
	925	tBackData.mMaxCostMisses = maxCostMisses;
[664]	926
[1020]	927	// statistics
[653]	928	if (1)
	929	{
[2070]	930	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	931	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	932	const float cData = (float)tData.mPvs * tData.mProbability;
[675]	933
[2070]	934	const float costDecr =
[1563]	935	(cFront + cBack - cData) / mBoundingBox.GetVolume();
[653]	936
	937	mTotalCost += costDecr;
	938	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
	939
[1020]	940	AddSubdivisionStats(mBspStats.Leaves(),
	941	-costDecr,
	942	splitCandidate.GetPriority(),
	943	mTotalCost,
	944	(float)mTotalPvsSize / (float)mBspStats.Leaves());
[653]	945	}
	946
[2070]	947	////////////
[653]	948	//-- push the new split candidates on the stack
[2070]	949
[1233]	950	VspBspSubdivisionCandidate frontCandidate;
[1145]	951	frontCandidate.mParentData = tFrontData;
	952
[1233]	953	VspBspSubdivisionCandidate backCandidate;
[1145]	954	backCandidate.mParentData = tBackData;
[653]	955
[1233]	956	EvalSubdivisionCandidate(frontCandidate);
	957	EvalSubdivisionCandidate(backCandidate);
[654]	958
[2071]	959	cout << "f cost: " << frontCandidate.mPriority << " " << frontCandidate.mRenderCostDecr << endl;
	960	cout << "b cost: " << backCandidate.mPriority << " " << backCandidate.mRenderCostDecr << endl;
[653]	961	tQueue.push(frontCandidate);
	962	tQueue.push(backCandidate);
[666]	963
[653]	964	// delete old leaf node
	965	DEL_PTR(tData.mNode);
	966	}
	967
[654]	968
[1551]	969	//////////////////
[653]	970	//-- terminate traversal and create new view cell
[1632]	971
[653]	972	if (newNode->IsLeaf())
	973	{
[2017]	974	BspLeaf leaf = static_cast<BspLeaf >(newNode);
[1020]	975
[653]	976	BspViewCell *viewCell = new BspViewCell();
[710]	977	leaf->SetViewCell(viewCell);
[653]	978
[2066]	979	if (STORE_PVS)
	980	{
	981	/////////
	982	//-- update pvs
[653]	983
[2066]	984	int conSamp = 0;
	985	float sampCon = 0.0f;
[752]	986
[2066]	987	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
	988
	989	// update scalar pvs size value
	990	ObjectPvs &pvs = viewCell->GetPvs();
	991	mViewCellsManager->UpdateScalarPvsSize(viewCell,
	992	pvs.EvalPvsCost(),
	993	pvs.GetSize());
	994
	995	mBspStats.contributingSamples += conSamp;
	996	mBspStats.sampleContributions += (int)sampCon;
	997	}
[653]	998
[1551]	999	viewCell->mLeaves.push_back(leaf);
	1000
	1001	///////////
[653]	1002	//-- store additional info
[1632]	1003
[653]	1004	if (mStoreRays)
	1005	{
	1006	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
	1007	for (it = tData.mRays->begin(); it != it_end; ++ it)
	1008	{
	1009	(*it).mRay->Ref();
	1010	leaf->mVssRays.push_back((*it).mRay);
	1011	}
	1012	}
[1551]	1013
[653]	1014	if (mUseAreaForPvs)
	1015	viewCell->SetArea(tData.mProbability);
	1016	else
	1017	viewCell->SetVolume(tData.mProbability);
	1018
[675]	1019	leaf->mProbability = tData.mProbability;
[653]	1020
[2070]	1021	// finally evaluate stats for this leaf
	1022	if (1)
[1027]	1023	EvaluateLeafStats(tData);
[653]	1024	}
	1025
	1026	//-- cleanup
	1027	tData.Clear();
	1028
	1029	return newNode;
	1030	}
	1031
	1032
[664]	1033	void VspBspTree::EvalPriority(VspBspTraversalData &tData) const
	1034	{
[735]	1035	switch (mNodePriorityQueueType)
	1036	{
	1037	case BREATH_FIRST:
[734]	1038	tData.mPriority = (float)-tData.mDepth;
[735]	1039	break;
	1040	case DEPTH_FIRST:
[734]	1041	tData.mPriority = (float)tData.mDepth;
[735]	1042	break;
	1043	default:
[734]	1044	tData.mPriority = tData.mPvs * tData.mProbability;
[735]	1045	//Debug << "priority: " << tData.mPriority << endl;
	1046	break;
	1047	}
[664]	1048	}
	1049
	1050
[1233]	1051	void VspBspTree::EvalSubdivisionCandidate(VspBspSubdivisionCandidate &splitCandidate)
[1145]	1052	{
	1053	VspBspTraversalData frontData;
	1054	VspBspTraversalData backData;
	1055
[2017]	1056	BspLeaf leaf = static_cast<BspLeaf >(splitCandidate.mParentData.mNode);
[1145]	1057
	1058	// compute locally best split plane
[1288]	1059	const bool costRatioViolated =
	1060	SelectPlane(splitCandidate.mSplitPlane,
	1061	leaf,
	1062	splitCandidate.mParentData,
	1063	frontData,
	1064	backData,
	1065	splitCandidate.mSplitAxis);
[652]	1066
[1288]	1067	// max cost threshold violated?
	1068	splitCandidate.mMaxCostMisses = costRatioViolated ?
	1069	splitCandidate.mParentData.mMaxCostMisses :
	1070	splitCandidate.mParentData.mMaxCostMisses + 1;
	1071
[1145]	1072	float oldRenderCost;
	1073
	1074	// compute global decrease in render cost
	1075	const float renderCostDecr = EvalRenderCostDecrease(splitCandidate.mSplitPlane,
	1076	splitCandidate.mParentData,
	1077	oldRenderCost);
	1078
	1079	splitCandidate.mRenderCostDecr = renderCostDecr;
	1080
	1081	// TODO: geometry could be reused
	1082	delete frontData.mGeometry;
	1083	delete backData.mGeometry;
	1084
	1085	// set priority for queue
	1086	#if 0
	1087	const float priority = (float)-data.mDepth;
	1088	#else
	1089
	1090	// take render cost of node into account
	1091	// otherwise danger of being stuck in a local minimum!!
	1092	const float factor = mRenderCostDecreaseWeight;
	1093	const float priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
	1094	#endif
	1095
	1096	splitCandidate.mPriority = priority;
	1097	}
	1098
	1099
	1100	void VspBspTree::EvalSubdivisionStats(const VspBspTraversalData &tData,
	1101	const VspBspTraversalData &tFrontData,
	1102	const VspBspTraversalData &tBackData)
	1103	{
	1104	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	1105	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	1106	const float cData = (float)tData.mPvs * tData.mProbability;
	1107
	1108	const float costDecr =
[1563]	1109	(cFront + cBack - cData) / mBoundingBox.GetVolume();
[1145]	1110
	1111	mTotalCost += costDecr;
	1112	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
	1113
	1114	AddSubdivisionStats(mBspStats.Leaves(),
	1115	-costDecr,
	1116	0,
	1117	mTotalCost,
	1118	(float)mTotalPvsSize / (float)mBspStats.Leaves());
	1119	}
	1120
	1121
[653]	1122	BspInterior *VspBspTree::SubdivideNode(const Plane3 &splitPlane,
	1123	VspBspTraversalData &tData,
	1124	VspBspTraversalData &frontData,
	1125	VspBspTraversalData &backData,
	1126	PolygonContainer &coincident)
[463]	1127	{
[2017]	1128	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
[508]	1129
[473]	1130	//-- the front and back traversal data is filled with the new values
	1131	frontData.mDepth = tData.mDepth + 1;
[508]	1132	frontData.mPolygons = new PolygonContainer();
[473]	1133	frontData.mRays = new RayInfoContainer();
[508]	1134
[473]	1135	backData.mDepth = tData.mDepth + 1;
[508]	1136	backData.mPolygons = new PolygonContainer();
[473]	1137	backData.mRays = new RayInfoContainer();
[508]	1138
[653]	1139
	1140	//-- subdivide rays
[652]	1141	SplitRays(splitPlane,
[482]	1142	*tData.mRays,
	1143	*frontData.mRays,
[463]	1144	*backData.mRays);
[482]	1145
[463]	1146
[472]	1147	// compute pvs
[463]	1148	frontData.mPvs = ComputePvsSize(*frontData.mRays);
	1149	backData.mPvs = ComputePvsSize(*backData.mRays);
	1150
[508]	1151	// split front and back node geometry and compute area
[547]	1152
	1153	// if geometry was not already computed
[602]	1154	if (!frontData.mGeometry && !backData.mGeometry)
[463]	1155	{
[547]	1156	frontData.mGeometry = new BspNodeGeometry();
	1157	backData.mGeometry = new BspNodeGeometry();
[482]	1158
[547]	1159	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
	1160	*backData.mGeometry,
[652]	1161	splitPlane,
[1563]	1162	mBoundingBox,
[679]	1163	//0.0f);
	1164	mEpsilon);
[508]	1165
[547]	1166	if (mUseAreaForPvs)
	1167	{
	1168	frontData.mProbability = frontData.mGeometry->GetArea();
	1169	backData.mProbability = backData.mGeometry->GetArea();
[508]	1170	}
[547]	1171	else
	1172	{
	1173	frontData.mProbability = frontData.mGeometry->GetVolume();
[654]	1174	backData.mProbability = tData.mProbability - frontData.mProbability;
[676]	1175
[744]	1176	// should never come here: wrong volume !!!
[676]	1177	if (0)
	1178	{
[744]	1179	if (frontData.mProbability < -0.00001)
	1180	Debug << "fatal error f: " << frontData.mProbability << endl;
	1181	if (backData.mProbability < -0.00001)
	1182	Debug << "fatal error b: " << backData.mProbability << endl;
	1183
	1184	// clamp because of precision issues
[676]	1185	if (frontData.mProbability < 0) frontData.mProbability = 0;
	1186	if (backData.mProbability < 0) backData.mProbability = 0;
	1187	}
[547]	1188	}
[463]	1189	}
[663]	1190
[547]	1191
[652]	1192	// subdivide polygons
	1193	SplitPolygons(splitPlane,
	1194	*tData.mPolygons,
	1195	*frontData.mPolygons,
	1196	*backData.mPolygons,
	1197	coincident);
[463]	1198
[652]	1199
	1200
[653]	1201	///////////////////////////////////////
	1202	// subdivide further
[652]	1203
[711]	1204	// store maximal and minimal depth
	1205	if (tData.mDepth > mBspStats.maxDepth)
	1206	{
	1207	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
	1208	mBspStats.maxDepth = tData.mDepth;
	1209	}
	1210
[652]	1211	mBspStats.nodes += 2;
	1212
[711]	1213
[652]	1214	BspInterior *interior = new BspInterior(splitPlane);
	1215
[1715]	1216	#ifdef GTP_DEBUG
[652]	1217	Debug << interior << endl;
	1218	#endif
	1219
[711]	1220
[463]	1221	//-- create front and back leaf
	1222
	1223	BspInterior *parent = leaf->GetParent();
	1224
	1225	// replace a link from node's parent
[487]	1226	if (parent)
[463]	1227	{
	1228	parent->ReplaceChildLink(leaf, interior);
	1229	interior->SetParent(parent);
	1230	}
	1231	else // new root
	1232	{
	1233	mRoot = interior;
	1234	}
	1235
	1236	// and setup child links
	1237	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
[482]	1238
[463]	1239	frontData.mNode = interior->GetFront();
	1240	backData.mNode = interior->GetBack();
[473]	1241
[650]	1242	interior->mTimeStamp = mTimeStamp ++;
[652]	1243
[711]	1244
[463]	1245	//DEL_PTR(leaf);
	1246	return interior;
	1247	}
	1248
[508]	1249
[463]	1250	void VspBspTree::AddToPvs(BspLeaf *leaf,
[482]	1251	const RayInfoContainer &rays,
[556]	1252	float &sampleContributions,
[463]	1253	int &contributingSamples)
	1254	{
[1002]	1255	sampleContributions = 0;
	1256	contributingSamples = 0;
[556]	1257
[1002]	1258	RayInfoContainer::const_iterator it, it_end = rays.end();
[556]	1259
[1002]	1260	ViewCellLeaf *vc = leaf->GetViewCell();
[556]	1261
[1002]	1262	// add contributions from samples to the PVS
	1263	for (it = rays.begin(); it != it_end; ++ it)
[463]	1264	{
[1002]	1265	float sc = 0.0f;
	1266	VssRay ray = (it).mRay;
	1267
	1268	bool madeContrib = false;
	1269	float contribution;
	1270
	1271	if (ray->mTerminationObject)
	1272	{
	1273	if (vc->AddPvsSample(ray->mTerminationObject, ray->mPdf, contribution))
	1274	madeContrib = true;
	1275	sc += contribution;
	1276	}
[556]	1277
[1006]	1278	// only count termination objects?
[1020]	1279	if (COUNT_ORIGIN_OBJECTS && ray->mOriginObject)
[1002]	1280	{
	1281	if (vc->AddPvsSample(ray->mOriginObject, ray->mPdf, contribution))
	1282	madeContrib = true;
[1020]	1283
[1002]	1284	sc += contribution;
	1285	}
[556]	1286
[1047]	1287	sampleContributions += sc;
	1288
	1289	if (madeContrib)
	1290	++ contributingSamples;
[463]	1291	}
	1292	}
	1293
[580]	1294
[1233]	1295	void VspBspTree::SortSubdivisionCandidates(const RayInfoContainer &rays,
[710]	1296	const int axis,
	1297	float minBand,
	1298	float maxBand)
[463]	1299	{
[1233]	1300	mLocalSubdivisionCandidates->clear();
[463]	1301
[2070]	1302	const int requestedSize = 2 * (int)(rays.size());
	1303
[480]	1304	// creates a sorted split candidates array
[1233]	1305	if (mLocalSubdivisionCandidates->capacity() > 500000 &&
	1306	requestedSize < (int)(mLocalSubdivisionCandidates->capacity() / 10) )
[480]	1307	{
[1233]	1308	delete mLocalSubdivisionCandidates;
	1309	mLocalSubdivisionCandidates = new vector<SortableEntry>;
[480]	1310	}
[463]	1311
[1233]	1312	mLocalSubdivisionCandidates->reserve(requestedSize);
[480]	1313
[710]	1314	if (0)
[1137]	1315	{ // float values => don't compare with exact values
[710]	1316	minBand += Limits::Small;
	1317	maxBand -= Limits::Small;
	1318	}
	1319
[480]	1320	// insert all queries
[612]	1321	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
[473]	1322	{
[612]	1323	const bool positive = (*ri).mRay->HasPosDir(axis);
[1137]	1324	float pos = (*ri).ExtrapOrigin(axis);
	1325
[710]	1326	// clamp to min / max band
	1327	if (0) ClipValue(pos, minBand, maxBand);
	1328
[2070]	1329	mLocalSubdivisionCandidates->
	1330	push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
[810]	1331	pos, (*ri).mRay));
[480]	1332
[710]	1333	pos = (*ri).ExtrapTermination(axis);
[1137]	1334
[710]	1335	// clamp to min / max band
	1336	if (0) ClipValue(pos, minBand, maxBand);
	1337
[2070]	1338	mLocalSubdivisionCandidates->
	1339	push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
[810]	1340	pos, (*ri).mRay));
[473]	1341	}
[480]	1342
[2124]	1343	stable_sort(mLocalSubdivisionCandidates->begin(), mLocalSubdivisionCandidates->end());
[463]	1344	}
	1345
[580]	1346
[480]	1347	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
	1348	const AxisAlignedBox3 &box,
	1349	const int pvsSize,
[710]	1350	const int axis,
[480]	1351	float &position)
[463]	1352	{
[1149]	1353	RayInfoContainer usedRays;
[1147]	1354
[1727]	1355	if (mMaxTests < (int)rays.size())
[1147]	1356	{
[1149]	1357	GetRayInfoSets(rays, mMaxTests, usedRays);
[1147]	1358	}
	1359	else
[1149]	1360	{
[1147]	1361	usedRays = rays;
[1149]	1362	}
[1147]	1363
[710]	1364	const float minBox = box.Min(axis);
	1365	const float maxBox = box.Max(axis);
[822]	1366
[710]	1367	const float sizeBox = maxBox - minBox;
[480]	1368
[801]	1369	const float minBand = minBox + mMinBand * sizeBox;
	1370	const float maxBand = minBox + mMaxBand * sizeBox;
[710]	1371
[1233]	1372	SortSubdivisionCandidates(usedRays, axis, minBand, maxBand);
[710]	1373
[1580]	1374	//////////////////
[463]	1375	// go through the lists, count the number of objects left and right
	1376	// and evaluate the following cost funcion:
[480]	1377	// C = ct_div_ci + (qlrl + qrrr)/queries
	1378
[1789]	1379	float pvsl = 0;
	1380	float pvsr = (float)pvsSize;
[480]	1381
[1789]	1382	float pvsBack = pvsl;
	1383	float pvsFront = pvsr;
[612]	1384
	1385	float sum = (float)pvsSize * sizeBox;
[463]	1386	float minSum = 1e20f;
[822]	1387
[710]	1388	// if no border can be found, take mid split
	1389	position = minBox + 0.5f * sizeBox;
[822]	1390
	1391	// the relative cost ratio
[1074]	1392	float ratio = 99999999.0f;
[822]	1393	bool splitPlaneFound = false;
[710]	1394
[480]	1395	Intersectable::NewMail();
[1147]	1396	RayInfoContainer::const_iterator ri, ri_end = usedRays.end();
[612]	1397
	1398	// set all object as belonging to the front pvs
[1149]	1399	for(ri = usedRays.begin(); ri != ri_end; ++ ri)
[463]	1400	{
[612]	1401	Intersectable oObject = (ri).mRay->mOriginObject;
	1402	Intersectable tObject = (ri).mRay->mTerminationObject;
	1403
[1020]	1404	if (COUNT_ORIGIN_OBJECTS && oObject)
[463]	1405	{
[612]	1406	if (!oObject->Mailed())
[482]	1407	{
[612]	1408	oObject->Mail();
	1409	oObject->mCounter = 1;
[482]	1410	}
[612]	1411	else
	1412	{
	1413	++ oObject->mCounter;
	1414	}
[463]	1415	}
[1020]	1416
[612]	1417	if (tObject)
	1418	{
	1419	if (!tObject->Mailed())
	1420	{
	1421	tObject->Mail();
	1422	tObject->mCounter = 1;
	1423	}
	1424	else
	1425	{
	1426	++ tObject->mCounter;
	1427	}
	1428	}
[480]	1429	}
	1430
	1431	Intersectable::NewMail();
[1233]	1432	vector<SortableEntry>::const_iterator ci, ci_end = mLocalSubdivisionCandidates->end();
[612]	1433
[1233]	1434	for (ci = mLocalSubdivisionCandidates->begin(); ci != ci_end; ++ ci)
[480]	1435	{
	1436	VssRay *ray;
[612]	1437	ray = (*ci).ray;
	1438
	1439	Intersectable *oObject = ray->mOriginObject;
	1440	Intersectable *tObject = ray->mTerminationObject;
	1441
[480]	1442	switch ((*ci).type)
[463]	1443	{
[480]	1444	case SortableEntry::ERayMin:
	1445	{
[1020]	1446	if (COUNT_ORIGIN_OBJECTS && oObject && !oObject->Mailed())
[480]	1447	{
[612]	1448	oObject->Mail();
	1449	++ pvsl;
[480]	1450	}
[1020]	1451
[612]	1452	if (tObject && !tObject->Mailed())
	1453	{
	1454	tObject->Mail();
	1455	++ pvsl;
	1456	}
[1020]	1457
[480]	1458	break;
	1459	}
	1460	case SortableEntry::ERayMax:
	1461	{
[1020]	1462	if (COUNT_ORIGIN_OBJECTS && oObject)
[612]	1463	{
	1464	if (-- oObject->mCounter == 0)
	1465	-- pvsr;
	1466	}
[463]	1467
[612]	1468	if (tObject)
[480]	1469	{
[612]	1470	if (-- tObject->mCounter == 0)
	1471	-- pvsr;
[480]	1472	}
	1473
	1474	break;
	1475	}
	1476	}
[822]	1477
	1478
[1020]	1479	// Note: we compare size of bounding boxes of front and back side because
	1480	// of efficiency reasons (otherwise a new geometry would have to be computed
	1481	// in each step and incremential evaluation would be difficult.
	1482	// but then errors happen if the geometry is not an axis aligned box
	1483	// (i.e., if a geometry aligned split was taken before)
	1484	// question: is it sufficient to make this approximation?
[710]	1485	if (((ci).value >= minBand) && ((ci).value <= maxBand))
[480]	1486	{
[612]	1487	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
[480]	1488
[1147]	1489	float currentPos;
	1490
	1491	// HACK: current positition is BETWEEN visibility events
[1149]	1492	if (0 && ((ci + 1) != ci_end))
	1493	{
[1147]	1494	currentPos = ((ci).value + ((ci + 1)).value) * 0.5f;
[1149]	1495	}
[1147]	1496	else
[1149]	1497	currentPos = (*ci).value;
[1147]	1498
[822]	1499	//Debug << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
	1500	//Debug << "cost= " << sum << endl;
[480]	1501
	1502	if (sum < minSum)
[463]	1503	{
[822]	1504	splitPlaneFound = true;
	1505
[463]	1506	minSum = sum;
[1147]	1507	position = currentPos;
[710]	1508
[612]	1509	pvsBack = pvsl;
	1510	pvsFront = pvsr;
[463]	1511	}
	1512	}
	1513	}
[710]	1514
[1767]	1515	///////
	1516	//-- compute cost
	1517
[1772]	1518	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
	1519	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
[612]	1520
	1521	const float pOverall = sizeBox;
	1522
	1523	const float pBack = position - minBox;
	1524	const float pFront = maxBox - position;
	1525
[1789]	1526	const float penaltyOld = EvalPvsPenalty((float)pvsSize, lowerPvsLimit, upperPvsLimit);
[612]	1527	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	1528	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
	1529
	1530	const float oldRenderCost = penaltyOld * pOverall;
	1531	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
	1532
[822]	1533	if (splitPlaneFound)
	1534	{
	1535	ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
	1536	}
	1537	//if (axis != 1)
	1538	//Debug << "axis=" << axis << " costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
	1539	// <<"\t pb=(" << pvsBack << ")\t pf=(" << pvsFront << ")" << endl;
[612]	1540
[480]	1541	return ratio;
[463]	1542	}
	1543
[480]	1544
[482]	1545	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
[491]	1546	const VspBspTraversalData &tData,
[495]	1547	int &axis,
[508]	1548	BspNodeGeometry **frontGeom,
	1549	BspNodeGeometry **backGeom,
[547]	1550	float &pFront,
	1551	float &pBack,
[710]	1552	const bool isKdNode)
[463]	1553	{
[508]	1554	float nPosition[3];
	1555	float nCostRatio[3];
[547]	1556	float nProbFront[3];
	1557	float nProbBack[3];
[508]	1558
	1559	BspNodeGeometry *nFrontGeom[3];
	1560	BspNodeGeometry *nBackGeom[3];
	1561
[822]	1562	// set to NULL, so I can find out which gemetry was stored
[612]	1563	for (int i = 0; i < 3; ++ i)
	1564	{
	1565	nFrontGeom[i] = NULL;
	1566	nBackGeom[i] = NULL;
	1567	}
	1568
[545]	1569	// create bounding box of node geometry
[463]	1570	AxisAlignedBox3 box;
[710]	1571
[562]	1572	//TODO: for kd split geometry already is box => only take minmax vertices
[551]	1573	if (1)
[1147]	1574	{ // get bounding box from geometry
[710]	1575	tData.mGeometry->GetBoundingBox(box);
[509]	1576	}
	1577	else
	1578	{
[710]	1579	box.Initialize();
[509]	1580	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
[480]	1581
[509]	1582	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
	1583	box.Include((*ri).ExtrapTermination());
	1584	}
[663]	1585
[1147]	1586
[663]	1587	int sAxis = 0;
[822]	1588	int bestAxis;
	1589
[837]	1590	// if max cost ratio is exceeded, take split along longest axis instead
	1591	const float maxCostRatioForArbitraryAxis = 0.9f;
	1592
[1006]	1593	if (mUseDrivingAxisIfMaxCostViolated)
[822]	1594	bestAxis = box.Size().DrivingAxis();
	1595	else
	1596	bestAxis = -1;
	1597
[978]	1598	#if 0
	1599	// maximum cost ratio for axis to be valid:
[822]	1600	// if exceeded, spatial mid split is used instead
[978]	1601	const maxCostRatioForHeur = 0.99f;
	1602	#endif
[822]	1603
[978]	1604	// if we use some kind of specialised fixed axis
[837]	1605	const bool useSpecialAxis =
	1606	mOnlyDrivingAxis \|\| mUseRandomAxis \|\| mCirculatingAxis;
[663]	1607
[801]	1608	if (mUseRandomAxis)
[663]	1609	sAxis = Random(3);
[801]	1610	else if (mCirculatingAxis)
[726]	1611	sAxis = (tData.mAxis + 1) % 3;
[822]	1612	else if (mOnlyDrivingAxis)
[801]	1613	sAxis = box.Size().DrivingAxis();
	1614
[664]	1615
[670]	1616	//Debug << "use special axis: " << useSpecialAxis << endl;
	1617	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
[1076]	1618
[822]	1619	for (axis = 0; axis < 3 ; ++ axis)
[480]	1620	{
[663]	1621	if (!useSpecialAxis \|\| (axis == sAxis))
[463]	1622	{
[822]	1623	if (mUseCostHeuristics)
[480]	1624	{
[1106]	1625	//-- place split plane using heuristics
[822]	1626	nCostRatio[axis] =
	1627	BestCostRatioHeuristics(*tData.mRays,
	1628	box,
	1629	tData.mPvs,
	1630	axis,
	1631	nPosition[axis]);
	1632	}
[1106]	1633	else
[1767]	1634	{
	1635	//-- split plane position is spatial median
[480]	1636	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
[543]	1637	Vector3 normal(0,0,0); normal[axis] = 1.0f;
[1076]	1638
[547]	1639	// allows faster split because we have axis aligned kd tree boxes
[822]	1640	if (isKdNode)
[542]	1641	{
	1642	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
	1643	box,
	1644	axis,
[547]	1645	nPosition[axis],
	1646	nProbFront[axis],
	1647	nProbBack[axis]);
[542]	1648
[710]	1649	// create back geometry from box
[1767]	1650
[1047]	1651	// NOTE: the geometry is returned from the function so we
	1652	// don't have to recompute it when possible
[1767]	1653	Vector3 pos;
	1654
[543]	1655	pos = box.Max(); pos[axis] = nPosition[axis];
[547]	1656	AxisAlignedBox3 bBox(box.Min(), pos);
[1767]	1657
[710]	1658	PolygonContainer fPolys;
	1659	bBox.ExtractPolys(fPolys);
	1660
	1661	nBackGeom[axis] = new BspNodeGeometry(fPolys);
	1662
[1767]	1663	////////////
[822]	1664	//-- create front geometry from box
[1767]	1665
[542]	1666	pos = box.Min(); pos[axis] = nPosition[axis];
[547]	1667	AxisAlignedBox3 fBox(pos, box.Max());
[710]	1668
	1669	PolygonContainer bPolys;
	1670	fBox.ExtractPolys(bPolys);
	1671	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
[542]	1672	}
	1673	else
	1674	{
[710]	1675	nFrontGeom[axis] = new BspNodeGeometry();
	1676	nBackGeom[axis] = new BspNodeGeometry();
	1677
[573]	1678	nCostRatio[axis] =
	1679	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
	1680	tData, nFrontGeom[axis], nBackGeom[axis],
	1681	nProbFront[axis], nProbBack[axis]);
[542]	1682	}
[480]	1683	}
[822]	1684
[978]	1685
[1006]	1686	if (mUseDrivingAxisIfMaxCostViolated)
[480]	1687	{
[978]	1688	// we take longest axis split if cost ratio exceeds threshold
	1689	if (nCostRatio[axis] < min(maxCostRatioForArbitraryAxis, nCostRatio[bestAxis]))
[822]	1690	{
	1691	bestAxis = axis;
	1692	}
[1072]	1693	/*else if (nCostRatio[axis] < nCostRatio[bestAxis])
	1694	{
[978]	1695	Debug << "taking split along longest axis (" << bestAxis << ") instead of (" << axis << ")" << endl;
[1072]	1696	}*/
	1697
[978]	1698	}
	1699	else
	1700	{
	1701	if (bestAxis == -1)
[822]	1702	{
	1703	bestAxis = axis;
	1704	}
[978]	1705	else if (nCostRatio[axis] < nCostRatio[bestAxis])
[822]	1706	{
	1707	bestAxis = axis;
	1708	}
[978]	1709	}
[463]	1710	}
	1711	}
	1712
[1767]	1713	//////////
[495]	1714	//-- assign values
[1072]	1715
[495]	1716	axis = bestAxis;
[547]	1717	pFront = nProbFront[bestAxis];
	1718	pBack = nProbBack[bestAxis];
[495]	1719
[508]	1720	// assign best split nodes geometry
	1721	*frontGeom = nFrontGeom[bestAxis];
	1722	*backGeom = nBackGeom[bestAxis];
[542]	1723
[508]	1724	// and delete other geometry
[612]	1725	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
	1726	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
[495]	1727
[508]	1728	//-- split plane
	1729	Vector3 normal(0,0,0); normal[bestAxis] = 1;
[480]	1730	plane = Plane3(normal, nPosition[bestAxis]);
[508]	1731
[822]	1732	//Debug << "best axis: " << bestAxis << " pos " << nPosition[bestAxis] << endl;
[1072]	1733
[480]	1734	return nCostRatio[bestAxis];
[463]	1735	}
	1736
[480]	1737
[508]	1738	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
	1739	BspLeaf *leaf,
[652]	1740	VspBspTraversalData &data,
[508]	1741	VspBspTraversalData &frontData,
[612]	1742	VspBspTraversalData &backData,
	1743	int &splitAxis)
[491]	1744	{
[810]	1745	// HACK matt: subdivide regularily to certain depth
[1072]	1746	if (data.mDepth < 0) // question matt: why depth < 0 ?
[801]	1747	{
[1072]	1748	cout << "depth: " << data.mDepth << endl;
	1749
[801]	1750	// return axis aligned split
	1751	AxisAlignedBox3 box;
	1752	box.Initialize();
	1753
	1754	// create bounding box of region
	1755	data.mGeometry->GetBoundingBox(box);
	1756
	1757	const int axis = box.Size().DrivingAxis();
	1758	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
	1759
	1760	Vector3 norm(0,0,0); norm[axis] = 1.0f;
	1761	bestPlane = Plane3(norm, position);
	1762	splitAxis = axis;
[1072]	1763
[801]	1764	return true;
	1765	}
	1766
[508]	1767	// simplest strategy: just take next polygon
	1768	if (mSplitPlaneStrategy & RANDOM_POLYGON)
[491]	1769	{
[508]	1770	if (!data.mPolygons->empty())
	1771	{
	1772	const int randIdx =
	1773	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
	1774	Polygon3 nextPoly = (data.mPolygons)[randIdx];
[491]	1775
[508]	1776	bestPlane = nextPoly->GetSupportingPlane();
	1777	return true;
	1778	}
[491]	1779	}
	1780
[508]	1781	//-- use heuristics to find appropriate plane
[491]	1782
[508]	1783	// intermediate plane
	1784	Plane3 plane;
	1785	float lowestCost = MAX_FLOAT;
[517]	1786
	1787	// decides if the first few splits should be only axisAligned
[508]	1788	const bool onlyAxisAligned =
	1789	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
	1790	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
	1791	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
	1792
	1793	const int limit = onlyAxisAligned ? 0 :
	1794	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
[491]	1795
[508]	1796	float candidateCost;
[491]	1797
[508]	1798	int maxIdx = (int)data.mPolygons->size();
[491]	1799
[508]	1800	for (int i = 0; i < limit; ++ i)
[491]	1801	{
[562]	1802	// the already taken candidates are stored behind maxIdx
	1803	// => assure that no index is taken twice
[508]	1804	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
	1805	Polygon3 poly = (data.mPolygons)[candidateIdx];
[491]	1806
[508]	1807	// swap candidate to the end to avoid testing same plane
	1808	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
	1809	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
[491]	1810
[508]	1811	// evaluate current candidate
	1812	BspNodeGeometry fGeom, bGeom;
	1813	float fArea, bArea;
	1814	plane = poly->GetSupportingPlane();
[573]	1815	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
[491]	1816
[508]	1817	if (candidateCost < lowestCost)
[491]	1818	{
[508]	1819	bestPlane = plane;
	1820	lowestCost = candidateCost;
[491]	1821	}
	1822	}
	1823
[1006]	1824
[508]	1825	//-- evaluate axis aligned splits
[1006]	1826
[508]	1827	int axis;
	1828	BspNodeGeometry fGeom, bGeom;
[547]	1829	float pFront, pBack;
[491]	1830
[653]	1831	candidateCost = 99999999.0f;
[491]	1832
[1006]	1833	// as a variant, we take axis aligned split only if there is
	1834	// more polygon available to guide the split
[653]	1835	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
	1836	{
	1837	candidateCost = SelectAxisAlignedPlane(plane,
	1838	data,
	1839	axis,
	1840	&fGeom,
	1841	&bGeom,
	1842	pFront,
	1843	pBack,
	1844	data.mIsKdNode);
	1845	}
	1846
[612]	1847	splitAxis = 3;
[562]	1848
[508]	1849	if (candidateCost < lowestCost)
	1850	{
	1851	bestPlane = plane;
	1852	lowestCost = candidateCost;
[612]	1853	splitAxis = axis;
[653]	1854
[542]	1855	// assign already computed values
	1856	// we can do this because we always save the
[562]	1857	// computed values from the axis aligned splits
[653]	1858
[612]	1859	if (fGeom && bGeom)
	1860	{
	1861	frontData.mGeometry = fGeom;
	1862	backData.mGeometry = bGeom;
[547]	1863
[612]	1864	frontData.mProbability = pFront;
	1865	backData.mProbability = pBack;
	1866	}
[508]	1867	}
	1868	else
[463]	1869	{
[508]	1870	DEL_PTR(fGeom);
	1871	DEL_PTR(bGeom);
[463]	1872	}
[678]	1873
[1715]	1874	#ifdef GTP_DEBUG
[508]	1875	Debug << "plane lowest cost: " << lowestCost << endl;
[679]	1876	#endif
[508]	1877
[801]	1878	// exeeded relative max cost ratio
[508]	1879	if (lowestCost > mTermMaxCostRatio)
[611]	1880	{
[508]	1881	return false;
[611]	1882	}
[508]	1883
	1884	return true;
[463]	1885	}
	1886
[480]	1887
[473]	1888	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
[482]	1889	{
[473]	1890	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
[482]	1891
[473]	1892	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
	1893	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
	1894
	1895	const Vector3 pt = (maxPt + minPt) * 0.5;
	1896	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
	1897
	1898	return Plane3(normal, pt);
	1899	}
	1900
[480]	1901
[473]	1902	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
[482]	1903	{
[473]	1904	Vector3 pt[3];
[482]	1905
[473]	1906	int idx[3];
	1907	int cmaxT = 0;
	1908	int cminT = 0;
	1909	bool chooseMin = false;
	1910
	1911	for (int j = 0; j < 3; ++ j)
	1912	{
	1913	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
[482]	1914
[473]	1915	if (idx[j] >= (int)rays.size())
	1916	{
	1917	idx[j] -= (int)rays.size();
[482]	1918
[473]	1919	chooseMin = (cminT < 2);
	1920	}
	1921	else
	1922	chooseMin = (cmaxT < 2);
	1923
	1924	RayInfo rayInf = rays[idx[j]];
	1925	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
[482]	1926	}
[473]	1927
	1928	return Plane3(pt[0], pt[1], pt[2]);
	1929	}
	1930
[580]	1931
[473]	1932	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
[482]	1933	{
[473]	1934	Vector3 pt[3];
[482]	1935
[473]	1936	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1937	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1938
	1939	// check if rays different
	1940	if (idx1 == idx2)
	1941	idx2 = (idx2 + 1) % (int)rays.size();
	1942
	1943	const RayInfo ray1 = rays[idx1];
	1944	const RayInfo ray2 = rays[idx2];
	1945
	1946	// normal vector of the plane parallel to both lines
	1947	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
	1948
	1949	// vector from line 1 to line 2
[479]	1950	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
[482]	1951
[473]	1952	// project vector on normal to get distance
	1953	const float dist = DotProd(vd, norm);
	1954
	1955	// point on plane lies halfway between the two planes
	1956	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
	1957
	1958	return Plane3(norm, planePt);
	1959	}
	1960
[495]	1961
[463]	1962	inline void VspBspTree::GenerateUniqueIdsForPvs()
	1963	{
[580]	1964	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
	1965	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
	1966	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
[463]	1967	}
	1968
[495]	1969
[652]	1970	float VspBspTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
[1145]	1971	const VspBspTraversalData &data,
	1972	float &normalizedOldRenderCost) const
[652]	1973	{
[729]	1974	float pvsFront = 0;
	1975	float pvsBack = 0;
	1976	float totalPvs = 0;
[652]	1977
	1978	// probability that view point lies in back / front node
	1979	float pOverall = data.mProbability;
	1980	float pFront = 0;
	1981	float pBack = 0;
	1982
	1983
	1984	// create unique ids for pvs heuristics
	1985	GenerateUniqueIdsForPvs();
	1986
	1987	for (int i = 0; i < data.mRays->size(); ++ i)
	1988	{
	1989	RayInfo rayInf = (*data.mRays)[i];
	1990
	1991	float t;
	1992	VssRay *ray = rayInf.mRay;
	1993	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
	1994
	1995	// find front and back pvs for origing and termination object
	1996	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
[1020]	1997
[1577]	1998	if (COUNT_ORIGIN_OBJECTS)
	1999	{
[1020]	2000	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
[1577]	2001	}
[652]	2002	}
	2003
	2004
	2005	BspNodeGeometry geomFront;
	2006	BspNodeGeometry geomBack;
	2007
	2008	// construct child geometry with regard to the candidate split plane
	2009	data.mGeometry->SplitGeometry(geomFront,
	2010	geomBack,
	2011	candidatePlane,
[1563]	2012	mBoundingBox,
[679]	2013	//0.0f);
	2014	mEpsilon);
[652]	2015
	2016	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
	2017	{
	2018	pFront = geomFront.GetVolume();
	2019	pBack = pOverall - pFront;
[675]	2020
[729]	2021	// something is wrong with the volume
[1027]	2022	if (0 && ((pFront < 0.0) \|\| (pBack < 0.0)))
[676]	2023	{
[752]	2024	Debug << "ERROR in volume:\n"
	2025	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
	2026	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
	2027	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
[676]	2028	}
[652]	2029	}
	2030	else
	2031	{
	2032	pFront = geomFront.GetArea();
	2033	pBack = geomBack.GetArea();
	2034	}
	2035
	2036
	2037	// -- pvs rendering heuristics
[1020]	2038
	2039	// upper and lower bounds
[1772]	2040	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
	2041	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
[652]	2042
[1772]	2043	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
	2044	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	2045	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
[652]	2046
	2047	const float oldRenderCost = pOverall * penaltyOld;
	2048	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
	2049
[1563]	2050	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBoundingBox.GetVolume();
[752]	2051
[1006]	2052	// take render cost of node into account to avoid being stuck in a local minimum
[1563]	2053	normalizedOldRenderCost = oldRenderCost / mBoundingBox.GetVolume();
[1006]	2054
[1145]	2055	return renderCostDecrease;
[652]	2056	}
	2057
	2058
[573]	2059	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
	2060	const VspBspTraversalData &data,
	2061	BspNodeGeometry &geomFront,
	2062	BspNodeGeometry &geomBack,
	2063	float &pFront,
	2064	float &pBack) const
[463]	2065	{
[729]	2066	float totalPvs = 0;
	2067	float pvsFront = 0;
	2068	float pvsBack = 0;
[652]	2069
[1006]	2070	// overall probability is used as normalizer
[463]	2071	float pOverall = 0;
[1006]	2072
	2073	// probability that view point lies in back / front node
[547]	2074	pFront = 0;
	2075	pBack = 0;
[463]	2076
[1020]	2077	int numTests; // the number of tests
[508]	2078
[1020]	2079	// if random samples shold be taken instead of testing all the rays
	2080	bool useRand;
[463]	2081
	2082	if ((int)data.mRays->size() > mMaxTests)
	2083	{
	2084	useRand = true;
[1020]	2085	numTests = mMaxTests;
[463]	2086	}
	2087	else
	2088	{
	2089	useRand = false;
[1020]	2090	numTests = (int)data.mRays->size();
[463]	2091	}
[508]	2092
[1020]	2093	// create unique ids for pvs heuristics
	2094	GenerateUniqueIdsForPvs();
	2095
	2096	for (int i = 0; i < numTests; ++ i)
[463]	2097	{
[508]	2098	const int testIdx = useRand ?
	2099	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
[463]	2100	RayInfo rayInf = (*data.mRays)[testIdx];
	2101
	2102	float t;
[508]	2103	VssRay *ray = rayInf.mRay;
[463]	2104	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
	2105
[652]	2106	// find front and back pvs for origing and termination object
	2107	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
[1020]	2108
[1580]	2109	if (COUNT_ORIGIN_OBJECTS)
	2110	{
[1020]	2111	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
[1580]	2112	}
[652]	2113	}
[508]	2114
[652]	2115	// construct child geometry with regard to the candidate split plane
[679]	2116	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
	2117	geomBack,
	2118	candidatePlane,
[1563]	2119	mBoundingBox,
[679]	2120	//0.0f);
	2121	mEpsilon);
[675]	2122
[652]	2123	pOverall = data.mProbability;
[463]	2124
[2072]	2125	if (!mUseAreaForPvs)
[652]	2126	{
	2127	pFront = geomFront.GetVolume();
	2128	pBack = pOverall - pFront;
[675]	2129
[729]	2130	// HACK: precision issues possible for unbalanced split => don't take this split!
[685]	2131	if (1 &&
[682]	2132	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
	2133	!geomFront.Valid() \|\| !geomBack.Valid()))
[676]	2134	{
[752]	2135	//Debug << "error f: " << pFront << " b: " << pBack << endl;
[1027]	2136
	2137	// high penalty for degenerated / wrong split
[711]	2138	return 99999.9f;
[676]	2139	}
[463]	2140	}
[652]	2141	else
[542]	2142	{
[2072]	2143	// use front and back cell areas to approximate volume
[652]	2144	pFront = geomFront.GetArea();
	2145	pBack = geomBack.GetArea();
[542]	2146	}
[652]	2147
[1772]	2148	////////
	2149	//-- pvs rendering heuristics
[542]	2150
[1773]	2151	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
	2152	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
[580]	2153
[652]	2154	// only render cost heuristics or combined with standard deviation
[1772]	2155	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
	2156	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	2157	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
[579]	2158
[652]	2159	const float oldRenderCost = pOverall * penaltyOld;
	2160	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
[579]	2161
[652]	2162	float oldCost, newCost;
[580]	2163
[652]	2164	// only render cost
	2165	if (1)
	2166	{
	2167	oldCost = oldRenderCost;
	2168	newCost = newRenderCost;
	2169	}
	2170	else // also considering standard deviation
	2171	{
	2172	// standard deviation is difference of back and front pvs
	2173	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
[580]	2174
[652]	2175	const float newDeviation = 0.5f *
	2176	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
[580]	2177
[652]	2178	const float oldDeviation = penaltyOld;
[580]	2179
[652]	2180	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
	2181	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
	2182	}
[580]	2183
[1020]	2184	const float cost = mPvsFactor * newCost / (oldCost + Limits::Small);
[607]	2185
[463]	2186
[1715]	2187	#ifdef GTP_DEBUG
[474]	2188	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
[508]	2189	<< " frontpvs: " << pvsFront << " pFront: " << pFront
	2190	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
[600]	2191	Debug << "cost: " << cost << endl;
[463]	2192	#endif
[482]	2193
[652]	2194	return cost;
[463]	2195	}
	2196
[508]	2197
[697]	2198	int VspBspTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
	2199	ViewCellContainer &viewCells) const
	2200	{
	2201	stack<bspNodePair> nodeStack;
	2202	BspNodeGeometry *rgeom = new BspNodeGeometry();
	2203
	2204	ConstructGeometry(mRoot, *rgeom);
	2205
	2206	nodeStack.push(bspNodePair(mRoot, rgeom));
	2207
	2208	ViewCell::NewMail();
	2209
	2210	while (!nodeStack.empty())
	2211	{
	2212	BspNode *node = nodeStack.top().first;
	2213	BspNodeGeometry *geom = nodeStack.top().second;
	2214	nodeStack.pop();
	2215
	2216	const int side = geom->ComputeIntersection(box);
	2217
	2218	switch (side)
	2219	{
	2220	case -1:
	2221	// node geometry is contained in box
	2222	CollectViewCells(node, true, viewCells, true);
	2223	break;
	2224
	2225	case 0:
	2226	if (node->IsLeaf())
	2227	{
[2017]	2228	BspLeaf leaf = static_cast<BspLeaf >(node);
[697]	2229
	2230	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
	2231	{
	2232	leaf->GetViewCell()->Mail();
	2233	viewCells.push_back(leaf->GetViewCell());
	2234	}
	2235	}
	2236	else
	2237	{
[2017]	2238	BspInterior interior = static_cast<BspInterior >(node);
[697]	2239
	2240	BspNode *first = interior->GetFront();
	2241	BspNode *second = interior->GetBack();
	2242
	2243	BspNodeGeometry *firstGeom = new BspNodeGeometry();
	2244	BspNodeGeometry *secondGeom = new BspNodeGeometry();
	2245
	2246	geom->SplitGeometry(*firstGeom,
	2247	*secondGeom,
	2248	interior->GetPlane(),
[1563]	2249	mBoundingBox,
[697]	2250	//0.0000001f);
	2251	mEpsilon);
	2252
	2253	nodeStack.push(bspNodePair(first, firstGeom));
	2254	nodeStack.push(bspNodePair(second, secondGeom));
	2255	}
	2256
	2257	break;
	2258	default:
	2259	// default: cull
	2260	break;
	2261	}
	2262
	2263	DEL_PTR(geom);
	2264
	2265	}
	2266
	2267	return (int)viewCells.size();
	2268	}
	2269
	2270
[580]	2271	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
	2272	const AxisAlignedBox3 &box,
	2273	const int axis,
	2274	const float &position,
	2275	float &pFront,
	2276	float &pBack) const
	2277	{
[729]	2278	float pvsTotal = 0;
	2279	float pvsFront = 0;
	2280	float pvsBack = 0;
[580]	2281
	2282	// create unique ids for pvs heuristics
	2283	GenerateUniqueIdsForPvs();
	2284
	2285	const int pvsSize = data.mPvs;
[726]	2286
[580]	2287	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
	2288
	2289	// this is the main ray classification loop!
	2290	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
	2291	{
	2292	// determine the side of this ray with respect to the plane
	2293	float t;
	2294	const int side = (*rit).ComputeRayIntersection(axis, position, t);
	2295
	2296	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
[1020]	2297
[1765]	2298	if (COUNT_ORIGIN_OBJECTS)
	2299	{
[1020]	2300	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
[1765]	2301	}
[580]	2302	}
	2303
[1020]	2304
[580]	2305	//-- pvs heuristics
	2306
[1020]	2307	float pOverall = data.mProbability;
[580]	2308
[1020]	2309	// note: we use a simplified computation assuming that we always do a
	2310	// spatial mid split
	2311
[580]	2312	if (!mUseAreaForPvs)
[1020]	2313	{
	2314	// volume
[580]	2315	pBack = pFront = pOverall * 0.5f;
	2316	#if 0
	2317	// box length substitute for probability
	2318	const float minBox = box.Min(axis);
	2319	const float maxBox = box.Max(axis);
	2320
	2321	pBack = position - minBox;
	2322	pFront = maxBox - position;
	2323	pOverall = maxBox - minBox;
	2324	#endif
	2325	}
	2326	else //-- area substitute for probability
	2327	{
	2328	const int axis2 = (axis + 1) % 3;
	2329	const int axis3 = (axis + 2) % 3;
	2330
	2331	const float faceArea =
	2332	(box.Max(axis2) - box.Min(axis2)) *
	2333	(box.Max(axis3) - box.Min(axis3));
	2334
	2335	pBack = pFront = pOverall * 0.5f + faceArea;
	2336	}
	2337
[1715]	2338	#ifdef GTP_DEBUG
[1302]	2339	Debug << "axis: " << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
	2340	Debug << "p: " << pFront << " " << pBack << " " << pOverall << endl;
[580]	2341	#endif
	2342
	2343
	2344	const float newCost = pvsBack * pBack + pvsFront * pFront;
	2345	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
	2346
	2347	return (mCtDivCi + newCost) / oldCost;
	2348	}
	2349
	2350
[1076]	2351	inline void VspBspTree::AddObjToPvs(Intersectable *obj,
	2352	const int cf,
	2353	float &frontPvs,
	2354	float &backPvs,
	2355	float &totalPvs) const
[463]	2356	{
	2357	if (!obj)
	2358	return;
[1076]	2359	#if 0
[744]	2360	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
[1076]	2361	#else
	2362	const int renderCost = 1;
	2363	#endif
[654]	2364	// new object
[508]	2365	if ((obj->mMailbox != sFrontId) &&
	2366	(obj->mMailbox != sBackId) &&
	2367	(obj->mMailbox != sFrontAndBackId))
	2368	{
[744]	2369	totalPvs += renderCost;
[508]	2370	}
	2371
[463]	2372	// TODO: does this really belong to no pvs?
	2373	//if (cf == Ray::COINCIDENT) return;
	2374
	2375	// object belongs to both PVS
	2376	if (cf >= 0)
	2377	{
[482]	2378	if ((obj->mMailbox != sFrontId) &&
[463]	2379	(obj->mMailbox != sFrontAndBackId))
	2380	{
[744]	2381	frontPvs += renderCost;
[508]	2382
[463]	2383	if (obj->mMailbox == sBackId)
[482]	2384	obj->mMailbox = sFrontAndBackId;
[463]	2385	else
[482]	2386	obj->mMailbox = sFrontId;
[463]	2387	}
	2388	}
[482]	2389
[463]	2390	if (cf <= 0)
	2391	{
	2392	if ((obj->mMailbox != sBackId) &&
	2393	(obj->mMailbox != sFrontAndBackId))
	2394	{
[744]	2395	backPvs += renderCost;
[508]	2396
[463]	2397	if (obj->mMailbox == sFrontId)
[482]	2398	obj->mMailbox = sFrontAndBackId;
[463]	2399	else
[482]	2400	obj->mMailbox = sBackId;
[463]	2401	}
	2402	}
	2403	}
	2404
[491]	2405
[503]	2406	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
	2407	const bool onlyUnmailed,
	2408	const int maxPvsSize) const
[463]	2409	{
	2410	stack<BspNode *> nodeStack;
	2411	nodeStack.push(mRoot);
[482]	2412
	2413	while (!nodeStack.empty())
[463]	2414	{
	2415	BspNode *node = nodeStack.top();
	2416	nodeStack.pop();
[489]	2417
[482]	2418	if (node->IsLeaf())
[463]	2419	{
[490]	2420	// test if this leaf is in valid view space
[2017]	2421	BspLeaf leaf = static_cast<BspLeaf >(node);
[503]	2422	if (leaf->TreeValid() &&
[508]	2423	(!onlyUnmailed \|\| !leaf->Mailed()) &&
[1707]	2424	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().EvalPvsCost() <= maxPvsSize)))
[490]	2425	{
	2426	leaves.push_back(leaf);
	2427	}
[482]	2428	}
	2429	else
[463]	2430	{
[2017]	2431	BspInterior interior = static_cast<BspInterior >(node);
[463]	2432
	2433	nodeStack.push(interior->GetBack());
	2434	nodeStack.push(interior->GetFront());
	2435	}
	2436	}
	2437	}
	2438
[489]	2439
[463]	2440	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
	2441	{
[1563]	2442	return mBoundingBox;
[463]	2443	}
	2444
[489]	2445
[463]	2446	BspNode *VspBspTree::GetRoot() const
	2447	{
	2448	return mRoot;
	2449	}
	2450
[489]	2451
[463]	2452	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
	2453	{
	2454	// the node became a leaf -> evaluate stats for leafs
[2017]	2455	BspLeaf leaf = static_cast<BspLeaf >(data.mNode);
[463]	2456
	2457
[574]	2458	if (data.mPvs > mBspStats.maxPvs)
[711]	2459	{
[574]	2460	mBspStats.maxPvs = data.mPvs;
[711]	2461	}
	2462
[656]	2463	mBspStats.pvs += data.mPvs;
	2464
[574]	2465	if (data.mDepth < mBspStats.minDepth)
[711]	2466	{
[574]	2467	mBspStats.minDepth = data.mDepth;
[711]	2468	}
[656]	2469
[463]	2470	if (data.mDepth >= mTermMaxDepth)
[711]	2471	{
[744]	2472	++ mBspStats.maxDepthNodes;
	2473	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
[711]	2474	}
[611]	2475
[508]	2476	// accumulate rays to compute rays / leaf
[574]	2477	mBspStats.accumRays += (int)data.mRays->size();
[463]	2478
[437]	2479	if (data.mPvs < mTermMinPvs)
[574]	2480	++ mBspStats.minPvsNodes;
[437]	2481
	2482	if ((int)data.mRays->size() < mTermMinRays)
[574]	2483	++ mBspStats.minRaysNodes;
[437]	2484
	2485	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
[574]	2486	++ mBspStats.maxRayContribNodes;
[482]	2487
[547]	2488	if (data.mProbability <= mTermMinProbability)
[574]	2489	++ mBspStats.minProbabilityNodes;
[508]	2490
[474]	2491	// accumulate depth to compute average depth
[574]	2492	mBspStats.accumDepth += data.mDepth;
[463]	2493
[612]	2494	++ mCreatedViewCells;
[656]	2495
[1715]	2496	#ifdef GTP_DEBUG
[463]	2497	Debug << "BSP stats: "
	2498	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
	2499	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
[1027]	2500	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
[1707]	2501	<< "#pvs: " << leaf->GetViewCell()->GetPvs().EvalPvsCost() << "), "
[463]	2502	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
	2503	#endif
	2504	}
	2505
[612]	2506
[463]	2507	int VspBspTree::CastRay(Ray &ray)
	2508	{
	2509	int hits = 0;
[482]	2510
[600]	2511	stack<BspRayTraversalData> tQueue;
[482]	2512
[463]	2513	float maxt, mint;
	2514
[1563]	2515	if (!mBoundingBox.GetRaySegment(ray, mint, maxt))
[463]	2516	return 0;
	2517
	2518	Intersectable::NewMail();
[600]	2519	ViewCell::NewMail();
[1012]	2520
[463]	2521	Vector3 entp = ray.Extrap(mint);
	2522	Vector3 extp = ray.Extrap(maxt);
[482]	2523
[463]	2524	BspNode *node = mRoot;
	2525	BspNode *farChild = NULL;
[482]	2526
[463]	2527	while (1)
	2528	{
[482]	2529	if (!node->IsLeaf())
[463]	2530	{
[2017]	2531	BspInterior in = static_cast<BspInterior >(node);
[463]	2532
	2533	Plane3 splitPlane = in->GetPlane();
	2534	const int entSide = splitPlane.Side(entp);
	2535	const int extSide = splitPlane.Side(extp);
	2536
	2537	if (entSide < 0)
	2538	{
	2539	node = in->GetBack();
	2540
	2541	if(extSide <= 0) // plane does not split ray => no far child
	2542	continue;
[482]	2543
[463]	2544	farChild = in->GetFront(); // plane splits ray
	2545
	2546	} else if (entSide > 0)
	2547	{
	2548	node = in->GetFront();
	2549
	2550	if (extSide >= 0) // plane does not split ray => no far child
	2551	continue;
	2552
[482]	2553	farChild = in->GetBack(); // plane splits ray
[463]	2554	}
	2555	else // ray and plane are coincident
	2556	{
[1012]	2557	// matt: WHAT TO DO IN THIS CASE ?
[463]	2558	//break;
	2559	node = in->GetFront();
	2560	continue;
	2561	}
	2562
	2563	// push data for far child
[600]	2564	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
[463]	2565
	2566	// find intersection of ray segment with plane
	2567	float t;
	2568	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
	2569	maxt *= t;
[1047]	2570	}
	2571	else // reached leaf => intersection with view cell
[463]	2572	{
[2017]	2573	BspLeaf leaf = static_cast<BspLeaf >(node);
[482]	2574
[463]	2575	if (!leaf->GetViewCell()->Mailed())
	2576	{
	2577	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
	2578	leaf->GetViewCell()->Mail();
	2579	++ hits;
	2580	}
[482]	2581
[463]	2582	//-- fetch the next far child from the stack
[600]	2583	if (tQueue.empty())
[463]	2584	break;
[482]	2585
[463]	2586	entp = extp;
	2587	mint = maxt; // NOTE: need this?
	2588
	2589	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
	2590	break;
	2591
[600]	2592	BspRayTraversalData &s = tQueue.top();
[463]	2593
	2594	node = s.mNode;
	2595	extp = s.mExitPoint;
	2596	maxt = s.mMaxT;
	2597
[600]	2598	tQueue.pop();
[463]	2599	}
	2600	}
	2601
	2602	return hits;
	2603	}
	2604
[532]	2605
[1072]	2606	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells,
	2607	bool onlyValid) const
[463]	2608	{
[532]	2609	ViewCell::NewMail();
[551]	2610	CollectViewCells(mRoot, onlyValid, viewCells, true);
[532]	2611	}
	2612
	2613
[1545]	2614	void VspBspTree::CollectViewCells(BspNode *root,
	2615	bool onlyValid,
	2616	ViewCellContainer &viewCells,
	2617	bool onlyUnmailed) const
	2618	{
	2619	stack<BspNode *> nodeStack;
	2620
	2621	if (!root)
	2622	return;
	2623
	2624	nodeStack.push(root);
	2625
	2626	while (!nodeStack.empty())
	2627	{
	2628	BspNode *node = nodeStack.top();
	2629	nodeStack.pop();
	2630
	2631	if (node->IsLeaf())
	2632	{
	2633	if (!onlyValid \|\| node->TreeValid())
	2634	{
[2017]	2635	ViewCellLeaf leafVc = static_cast<BspLeaf >(node)->GetViewCell();
[1545]	2636
	2637	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
	2638
	2639	if (!onlyUnmailed \|\| !viewCell->Mailed())
	2640	{
	2641	viewCell->Mail();
	2642	viewCells.push_back(viewCell);
	2643	}
	2644	}
	2645	}
	2646	else
	2647	{
[2017]	2648	BspInterior interior = static_cast<BspInterior >(node);
[1545]	2649
	2650	nodeStack.push(interior->GetFront());
	2651	nodeStack.push(interior->GetBack());
	2652	}
	2653	}
	2654	}
	2655
	2656
[574]	2657	void VspBspTree::CollapseViewCells()
[542]	2658	{
[590]	2659	// TODO
[728]	2660	#if HAS_TO_BE_REDONE
[542]	2661	stack<BspNode *> nodeStack;
	2662
	2663	if (!mRoot)
	2664	return;
	2665
	2666	nodeStack.push(mRoot);
	2667
	2668	while (!nodeStack.empty())
	2669	{
	2670	BspNode *node = nodeStack.top();
	2671	nodeStack.pop();
	2672
	2673	if (node->IsLeaf())
[574]	2674	{
[2017]	2675	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
[542]	2676
[574]	2677	if (!viewCell->GetValid())
[542]	2678	{
[2017]	2679	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
[580]	2680
	2681	ViewCellContainer leaves;
[590]	2682	mViewCellsTree->CollectLeaves(viewCell, leaves);
[580]	2683
	2684	ViewCellContainer::const_iterator it, it_end = leaves.end();
	2685
	2686	for (it = leaves.begin(); it != it_end; ++ it)
[542]	2687	{
[2017]	2688	BspLeaf l = static_cast<BspViewCell >(*it)->mLeaf;
[574]	2689	l->SetViewCell(GetOrCreateOutOfBoundsCell());
	2690	++ mBspStats.invalidLeaves;
	2691	}
[542]	2692
[574]	2693	// add to unbounded view cell
	2694	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
	2695	DEL_PTR(viewCell);
	2696	}
	2697	}
	2698	else
	2699	{
[2017]	2700	BspInterior interior = static_cast<BspInterior >(node);
[574]	2701
	2702	nodeStack.push(interior->GetFront());
	2703	nodeStack.push(interior->GetBack());
	2704	}
	2705	}
[542]	2706
[574]	2707	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
[590]	2708	#endif
[574]	2709	}
	2710
	2711
[639]	2712	void VspBspTree::CollectRays(VssRayContainer &rays)
	2713	{
	2714	vector<BspLeaf *> leaves;
	2715
	2716	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
	2717
	2718	for (lit = leaves.begin(); lit != lit_end; ++ lit)
	2719	{
	2720	BspLeaf leaf = lit;
	2721	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
	2722
	2723	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
	2724	rays.push_back(*rit);
	2725	}
	2726	}
	2727
	2728
[574]	2729	void VspBspTree::ValidateTree()
	2730	{
	2731	stack<BspNode *> nodeStack;
	2732
	2733	if (!mRoot)
	2734	return;
	2735
	2736	nodeStack.push(mRoot);
	2737
	2738	mBspStats.invalidLeaves = 0;
	2739	while (!nodeStack.empty())
	2740	{
	2741	BspNode *node = nodeStack.top();
	2742	nodeStack.pop();
	2743
	2744	if (node->IsLeaf())
	2745	{
[2017]	2746	BspLeaf leaf = static_cast<BspLeaf >(node);
[574]	2747
	2748	if (!leaf->GetViewCell()->GetValid())
	2749	++ mBspStats.invalidLeaves;
	2750
	2751	// validity flags don't match => repair
	2752	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
	2753	{
	2754	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
	2755	PropagateUpValidity(leaf);
[542]	2756	}
	2757	}
	2758	else
	2759	{
[2017]	2760	BspInterior interior = static_cast<BspInterior >(node);
[542]	2761
	2762	nodeStack.push(interior->GetFront());
	2763	nodeStack.push(interior->GetBack());
	2764	}
	2765	}
[562]	2766
[574]	2767	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
[542]	2768	}
	2769
[547]	2770
[648]	2771	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
	2772	{
	2773	// preprocess: throw out polygons coincident to the view space box (not needed)
	2774	PolygonContainer boxPolys;
[1027]	2775
[1563]	2776	mBoundingBox.ExtractPolys(boxPolys);
[648]	2777	vector<Plane3> boxPlanes;
	2778
	2779	PolygonContainer::iterator pit, pit_end = boxPolys.end();
	2780
	2781	// extract planes of box
	2782	// TODO: can be done more elegantly than first extracting polygons
	2783	// and take their planes
	2784	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
	2785	{
	2786	boxPlanes.push_back((*pit)->GetSupportingPlane());
	2787	}
	2788
	2789	pit_end = polys.end();
	2790
	2791	for (pit = polys.begin(); pit != pit_end; ++ pit)
	2792	{
	2793	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
	2794
	2795	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
	2796	{
	2797	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
	2798
	2799	if (cf == Polygon3::COINCIDENT)
	2800	{
	2801	DEL_PTR(*pit);
	2802	//Debug << "coincident!!" << endl;
	2803	}
	2804	}
	2805	}
	2806
[1002]	2807	// remove deleted entries after swapping them to end of vector
[648]	2808	for (int i = 0; i < (int)polys.size(); ++ i)
	2809	{
	2810	while (!polys[i] && (i < (int)polys.size()))
	2811	{
	2812	swap(polys[i], polys.back());
	2813	polys.pop_back();
	2814	}
[1027]	2815	}
[648]	2816	}
	2817
	2818
[463]	2819	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
	2820	{
	2821	float len = 0;
	2822
	2823	RayInfoContainer::const_iterator it, it_end = rays.end();
	2824
	2825	for (it = rays.begin(); it != it_end; ++ it)
	2826	len += (*it).SegmentLength();
	2827
	2828	return len;
	2829	}
	2830
[479]	2831
[463]	2832	int VspBspTree::SplitRays(const Plane3 &plane,
[482]	2833	RayInfoContainer &rays,
	2834	RayInfoContainer &frontRays,
[639]	2835	RayInfoContainer &backRays) const
[463]	2836	{
	2837	int splits = 0;
	2838
[574]	2839	RayInfoContainer::const_iterator it, it_end = rays.end();
	2840
	2841	for (it = rays.begin(); it != it_end; ++ it)
[463]	2842	{
[574]	2843	RayInfo bRay = *it;
	2844
[463]	2845	VssRay *ray = bRay.mRay;
[473]	2846	float t;
[463]	2847
[485]	2848	// get classification and receive new t
[463]	2849	const int cf = bRay.ComputeRayIntersection(plane, t);
[482]	2850
[463]	2851	switch (cf)
	2852	{
	2853	case -1:
	2854	backRays.push_back(bRay);
	2855	break;
	2856	case 1:
	2857	frontRays.push_back(bRay);
	2858	break;
[482]	2859	case 0:
	2860	{
[485]	2861	//-- split ray
[639]	2862	// test if start point behind or in front of plane
[485]	2863	const int side = plane.Side(bRay.ExtrapOrigin());
	2864
[1011]	2865	++ splits;
	2866
[485]	2867	if (side <= 0)
	2868	{
	2869	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
	2870	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
	2871	}
	2872	else
	2873	{
	2874	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
	2875	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
	2876	}
[463]	2877	}
	2878	break;
	2879	default:
[485]	2880	Debug << "Should not come here" << endl;
[463]	2881	break;
	2882	}
	2883	}
	2884
	2885	return splits;
	2886	}
	2887
[479]	2888
[463]	2889	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
	2890	{
	2891	BspNode *lastNode;
	2892
	2893	do
	2894	{
	2895	lastNode = n;
	2896
	2897	// want to get planes defining geometry of this node => don't take
	2898	// split plane of node itself
	2899	n = n->GetParent();
[482]	2900
[463]	2901	if (n)
	2902	{
[2017]	2903	BspInterior interior = static_cast<BspInterior >(n);
	2904	Plane3 halfSpace = static_cast<BspInterior *>(interior)->GetPlane();
[463]	2905
[683]	2906	if (interior->GetBack() != lastNode)
[463]	2907	halfSpace.ReverseOrientation();
	2908
	2909	halfSpaces.push_back(halfSpace);
	2910	}
	2911	}
	2912	while (n);
	2913	}
	2914
[485]	2915
[482]	2916	void VspBspTree::ConstructGeometry(BspNode *n,
[503]	2917	BspNodeGeometry &geom) const
[463]	2918	{
[437]	2919	vector<Plane3> halfSpaces;
	2920	ExtractHalfSpaces(n, halfSpaces);
	2921
	2922	PolygonContainer candidatePolys;
[678]	2923	vector<Plane3> candidatePlanes;
[437]	2924
[719]	2925	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
	2926
[683]	2927	// bounded planes are added to the polygons
[719]	2928	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
[437]	2929	{
[719]	2930	Polygon3 p = GetBoundingBox().CrossSection(pit);
[482]	2931
[448]	2932	if (p->Valid(mEpsilon))
[437]	2933	{
[683]	2934	candidatePolys.push_back(p);
[719]	2935	candidatePlanes.push_back(*pit);
[437]	2936	}
	2937	}
	2938
	2939	// add faces of bounding box (also could be faces of the cell)
	2940	for (int i = 0; i < 6; ++ i)
	2941	{
	2942	VertexContainer vertices;
[482]	2943
[437]	2944	for (int j = 0; j < 4; ++ j)
[1563]	2945	{
	2946	vertices.push_back(mBoundingBox.GetFace(i).mVertices[j]);
	2947	}
[437]	2948
[678]	2949	Polygon3 *poly = new Polygon3(vertices);
	2950
	2951	candidatePolys.push_back(poly);
	2952	candidatePlanes.push_back(poly->GetSupportingPlane());
[437]	2953	}
	2954
	2955	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
	2956	{
	2957	// polygon is split by all other planes
	2958	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
	2959	{
	2960	if (i == j) // polygon and plane are coincident
	2961	continue;
	2962
	2963	VertexContainer splitPts;
	2964	Polygon3 frontPoly, backPoly;
	2965
[482]	2966	const int cf =
[448]	2967	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
	2968	mEpsilon);
[482]	2969
[437]	2970	switch (cf)
	2971	{
	2972	case Polygon3::SPLIT:
	2973	frontPoly = new Polygon3();
	2974	backPoly = new Polygon3();
	2975
[482]	2976	candidatePolys[i]->Split(halfSpaces[j],
	2977	*frontPoly,
[448]	2978	*backPoly,
	2979	mEpsilon);
[437]	2980
	2981	DEL_PTR(candidatePolys[i]);
	2982
[683]	2983	if (backPoly->Valid(mEpsilon))
[1563]	2984	{
[683]	2985	candidatePolys[i] = backPoly;
[1563]	2986	}
[437]	2987	else
[1563]	2988	{
[683]	2989	DEL_PTR(backPoly);
[1563]	2990	}
[437]	2991
[683]	2992	// outside, don't need this
	2993	DEL_PTR(frontPoly);
[437]	2994	break;
[1563]	2995
[683]	2996	// polygon outside of halfspace
	2997	case Polygon3::FRONT_SIDE:
[437]	2998	DEL_PTR(candidatePolys[i]);
	2999	break;
[1563]	3000
[437]	3001	// just take polygon as it is
[683]	3002	case Polygon3::BACK_SIDE:
[437]	3003	case Polygon3::COINCIDENT:
	3004	default:
	3005	break;
	3006	}
	3007	}
[482]	3008
[437]	3009	if (candidatePolys[i])
[678]	3010	{
	3011	geom.Add(candidatePolys[i], candidatePlanes[i]);
	3012	}
[437]	3013	}
[463]	3014	}
	3015
[485]	3016
[1563]	3017	bool VspBspTree::IsOutOfBounds(ViewCell *vc) const
	3018	{
	3019	return vc->GetId() == OUT_OF_BOUNDS_ID;
	3020	}
	3021
	3022
	3023	void VspBspTree::SetViewCellsTree(ViewCellsTree *viewCellsTree)
	3024	{
	3025	mViewCellsTree = viewCellsTree;
	3026	}
	3027
	3028
[582]	3029	void VspBspTree::ConstructGeometry(ViewCell *vc,
[503]	3030	BspNodeGeometry &vcGeom) const
[589]	3031	{
[1551]	3032	// if false, cannot construct geometry for interior leaf
	3033	if (!mViewCellsTree)
	3034	return;
	3035
[580]	3036	ViewCellContainer leaves;
[590]	3037	mViewCellsTree->CollectLeaves(vc, leaves);
[463]	3038
[580]	3039	ViewCellContainer::const_iterator it, it_end = leaves.end();
	3040
[463]	3041	for (it = leaves.begin(); it != it_end; ++ it)
[580]	3042	{
[1563]	3043	if (IsOutOfBounds(*it))
[1557]	3044	continue;
	3045
[2017]	3046	BspViewCell bspVc = static_cast<BspViewCell >(*it);
[1551]	3047	vector<BspLeaf *>::const_iterator bit, bit_end = bspVc->mLeaves.end();
	3048
	3049	for (bit = bspVc->mLeaves.begin(); bit != bit_end; ++ bit)
	3050	{
	3051	BspLeaf l = bit;
	3052	ConstructGeometry(l, vcGeom);
	3053	}
[580]	3054	}
[463]	3055	}
	3056
[485]	3057
[482]	3058	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
[562]	3059	const bool onlyUnmailed) const
[463]	3060	{
[551]	3061	stack<bspNodePair> nodeStack;
	3062
	3063	BspNodeGeometry nodeGeom;
	3064	ConstructGeometry(n, nodeGeom);
[801]	3065	// const float eps = 0.5f;
[752]	3066	const float eps = 0.01f;
[500]	3067	// split planes from the root to this node
	3068	// needed to verify that we found neighbor leaf
[557]	3069	// TODO: really needed?
[463]	3070	vector<Plane3> halfSpaces;
	3071	ExtractHalfSpaces(n, halfSpaces);
	3072
[551]	3073
	3074	BspNodeGeometry *rgeom = new BspNodeGeometry();
	3075	ConstructGeometry(mRoot, *rgeom);
	3076
	3077	nodeStack.push(bspNodePair(mRoot, rgeom));
	3078
[482]	3079	while (!nodeStack.empty())
[463]	3080	{
[551]	3081	BspNode *node = nodeStack.top().first;
	3082	BspNodeGeometry *geom = nodeStack.top().second;
[562]	3083
[463]	3084	nodeStack.pop();
	3085
[557]	3086	if (node->IsLeaf())
[562]	3087	{
[557]	3088	// test if this leaf is in valid view space
	3089	if (node->TreeValid() &&
	3090	(node != n) &&
	3091	(!onlyUnmailed \|\| !node->Mailed()))
	3092	{
	3093	bool isAdjacent = true;
[551]	3094
[570]	3095	if (1)
[557]	3096	{
[562]	3097	// test all planes of current node if still adjacent
	3098	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
	3099	{
	3100	const int cf =
[678]	3101	Polygon3::ClassifyPlane(geom->GetPolys(),
[562]	3102	halfSpaces[i],
[752]	3103	eps);
[482]	3104
[683]	3105	if (cf == Polygon3::FRONT_SIDE)
[562]	3106	{
	3107	isAdjacent = false;
	3108	}
[557]	3109	}
	3110	}
[562]	3111	else
[557]	3112	{
[562]	3113	// TODO: why is this wrong??
	3114	// test all planes of current node if still adjacent
[678]	3115	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
[562]	3116	{
[678]	3117	Polygon3 *poly = nodeGeom.GetPolys()[i];
[555]	3118
[562]	3119	const int cf =
[678]	3120	Polygon3::ClassifyPlane(geom->GetPolys(),
[562]	3121	poly->GetSupportingPlane(),
[752]	3122	eps);
[557]	3123
[683]	3124	if (cf == Polygon3::FRONT_SIDE)
[562]	3125	{
	3126	isAdjacent = false;
	3127	}
[557]	3128	}
[570]	3129	}
[557]	3130	// neighbor was found
	3131	if (isAdjacent)
[562]	3132	{
[2017]	3133	neighbors.push_back(static_cast<BspLeaf *>(node));
[562]	3134	}
[463]	3135	}
[562]	3136	}
	3137	else
	3138	{
[2017]	3139	BspInterior interior = static_cast<BspInterior >(node);
[482]	3140
[678]	3141	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
[562]	3142	interior->GetPlane(),
[752]	3143	eps);
[551]	3144
[562]	3145	BspNode *front = interior->GetFront();
	3146	BspNode *back = interior->GetBack();
[551]	3147
[562]	3148	BspNodeGeometry *fGeom = new BspNodeGeometry();
	3149	BspNodeGeometry *bGeom = new BspNodeGeometry();
[463]	3150
[562]	3151	geom->SplitGeometry(*fGeom,
	3152	*bGeom,
	3153	interior->GetPlane(),
[1563]	3154	mBoundingBox,
[675]	3155	//0.0000001f);
[752]	3156	eps);
[551]	3157
[683]	3158	if (cf == Polygon3::BACK_SIDE)
[562]	3159	{
[683]	3160	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	3161	DEL_PTR(fGeom);
[562]	3162	}
	3163	else
	3164	{
[683]	3165	if (cf == Polygon3::FRONT_SIDE)
[551]	3166	{
[683]	3167	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	3168	DEL_PTR(bGeom);
[551]	3169	}
[482]	3170	else
[562]	3171	{ // random decision
	3172	nodeStack.push(bspNodePair(front, fGeom));
	3173	nodeStack.push(bspNodePair(back, bGeom));
[463]	3174	}
[551]	3175	}
[463]	3176	}
[562]	3177
[551]	3178	DEL_PTR(geom);
[463]	3179	}
[482]	3180
[463]	3181	return (int)neighbors.size();
	3182	}
	3183
[489]	3184
[600]	3185
[710]	3186	int VspBspTree::FindApproximateNeighbors(BspNode *n,
	3187	vector<BspLeaf *> &neighbors,
[600]	3188	const bool onlyUnmailed) const
	3189	{
	3190	stack<bspNodePair> nodeStack;
	3191
	3192	BspNodeGeometry nodeGeom;
	3193	ConstructGeometry(n, nodeGeom);
	3194
[752]	3195	float eps = 0.01f;
[600]	3196	// split planes from the root to this node
	3197	// needed to verify that we found neighbor leaf
	3198	// TODO: really needed?
	3199	vector<Plane3> halfSpaces;
	3200	ExtractHalfSpaces(n, halfSpaces);
	3201
	3202
	3203	BspNodeGeometry *rgeom = new BspNodeGeometry();
	3204	ConstructGeometry(mRoot, *rgeom);
	3205
	3206	nodeStack.push(bspNodePair(mRoot, rgeom));
	3207
	3208	while (!nodeStack.empty())
	3209	{
	3210	BspNode *node = nodeStack.top().first;
	3211	BspNodeGeometry *geom = nodeStack.top().second;
	3212
	3213	nodeStack.pop();
	3214
	3215	if (node->IsLeaf())
	3216	{
	3217	// test if this leaf is in valid view space
	3218	if (node->TreeValid() &&
	3219	(node != n) &&
	3220	(!onlyUnmailed \|\| !node->Mailed()))
	3221	{
	3222	bool isAdjacent = true;
	3223
	3224	// neighbor was found
	3225	if (isAdjacent)
	3226	{
[2017]	3227	neighbors.push_back(static_cast<BspLeaf *>(node));
[600]	3228	}
	3229	}
	3230	}
	3231	else
	3232	{
[2017]	3233	BspInterior interior = static_cast<BspInterior >(node);
[600]	3234
[678]	3235	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
[600]	3236	interior->GetPlane(),
[752]	3237	eps);
[600]	3238
	3239	BspNode *front = interior->GetFront();
	3240	BspNode *back = interior->GetBack();
	3241
	3242	BspNodeGeometry *fGeom = new BspNodeGeometry();
	3243	BspNodeGeometry *bGeom = new BspNodeGeometry();
	3244
	3245	geom->SplitGeometry(*fGeom,
	3246	*bGeom,
	3247	interior->GetPlane(),
[1563]	3248	mBoundingBox,
[675]	3249	//0.0000001f);
[752]	3250	eps);
[600]	3251
[683]	3252	if (cf == Polygon3::BACK_SIDE)
[600]	3253	{
[683]	3254	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	3255	DEL_PTR(fGeom);
[710]	3256	}
[600]	3257	else
	3258	{
[683]	3259	if (cf == Polygon3::FRONT_SIDE)
[600]	3260	{
[683]	3261	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	3262	DEL_PTR(bGeom);
[600]	3263	}
	3264	else
	3265	{ // random decision
	3266	nodeStack.push(bspNodePair(front, fGeom));
	3267	nodeStack.push(bspNodePair(back, bGeom));
	3268	}
	3269	}
	3270	}
	3271
	3272	DEL_PTR(geom);
	3273	}
	3274
	3275	return (int)neighbors.size();
	3276	}
	3277
	3278
	3279
[463]	3280	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
	3281	{
	3282	stack<BspNode *> nodeStack;
	3283	nodeStack.push(mRoot);
[482]	3284
[463]	3285	int mask = rand();
[482]	3286
	3287	while (!nodeStack.empty())
[463]	3288	{
	3289	BspNode *node = nodeStack.top();
	3290	nodeStack.pop();
[482]	3291
	3292	if (node->IsLeaf())
[463]	3293	{
[2017]	3294	return static_cast<BspLeaf *>(node);
[482]	3295	}
	3296	else
[463]	3297	{
[2017]	3298	BspInterior interior = static_cast<BspInterior >(node);
[463]	3299	BspNode *next;
[503]	3300	BspNodeGeometry geom;
[482]	3301
[463]	3302	// todo: not very efficient: constructs full cell everytime
[498]	3303	ConstructGeometry(interior, geom);
[463]	3304
[503]	3305	const int cf =
[678]	3306	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
[463]	3307
	3308	if (cf == Polygon3::BACK_SIDE)
	3309	next = interior->GetFront();
	3310	else
	3311	if (cf == Polygon3::FRONT_SIDE)
	3312	next = interior->GetFront();
[482]	3313	else
[463]	3314	{
	3315	// random decision
	3316	if (mask & 1)
	3317	next = interior->GetBack();
	3318	else
	3319	next = interior->GetFront();
	3320	mask = mask >> 1;
	3321	}
	3322
	3323	nodeStack.push(next);
	3324	}
	3325	}
[482]	3326
[463]	3327	return NULL;
	3328	}
	3329
[694]	3330
[463]	3331	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
	3332	{
	3333	stack<BspNode *> nodeStack;
[482]	3334
[463]	3335	nodeStack.push(mRoot);
	3336
	3337	int mask = rand();
[482]	3338
	3339	while (!nodeStack.empty())
[463]	3340	{
	3341	BspNode *node = nodeStack.top();
	3342	nodeStack.pop();
[482]	3343
	3344	if (node->IsLeaf())
[463]	3345	{
	3346	if ( (!onlyUnmailed \|\| !node->Mailed()) )
[2017]	3347	return static_cast<BspLeaf *>(node);
[463]	3348	}
[482]	3349	else
[463]	3350	{
[2017]	3351	BspInterior interior = static_cast<BspInterior >(node);
[463]	3352
	3353	// random decision
	3354	if (mask & 1)
	3355	nodeStack.push(interior->GetBack());
	3356	else
	3357	nodeStack.push(interior->GetFront());
	3358
	3359	mask = mask >> 1;
	3360	}
	3361	}
[482]	3362
[463]	3363	return NULL;
	3364	}
	3365
[694]	3366
[463]	3367	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
	3368	{
	3369	int pvsSize = 0;
	3370
	3371	RayInfoContainer::const_iterator rit, rit_end = rays.end();
	3372
	3373	Intersectable::NewMail();
	3374
	3375	for (rit = rays.begin(); rit != rays.end(); ++ rit)
	3376	{
	3377	VssRay ray = (rit).mRay;
[482]	3378
[1020]	3379	if (COUNT_ORIGIN_OBJECTS && ray->mOriginObject)
[463]	3380	{
	3381	if (!ray->mOriginObject->Mailed())
	3382	{
	3383	ray->mOriginObject->Mail();
	3384	++ pvsSize;
	3385	}
	3386	}
[1020]	3387
[463]	3388	if (ray->mTerminationObject)
	3389	{
	3390	if (!ray->mTerminationObject->Mailed())
	3391	{
	3392	ray->mTerminationObject->Mail();
	3393	++ pvsSize;
	3394	}
	3395	}
	3396	}
	3397
	3398	return pvsSize;
	3399	}
	3400
[694]	3401
[463]	3402	float VspBspTree::GetEpsilon() const
	3403	{
	3404	return mEpsilon;
	3405	}
	3406
	3407
	3408	int VspBspTree::SplitPolygons(const Plane3 &plane,
[482]	3409	PolygonContainer &polys,
	3410	PolygonContainer &frontPolys,
	3411	PolygonContainer &backPolys,
[463]	3412	PolygonContainer &coincident) const
	3413	{
	3414	int splits = 0;
	3415
[574]	3416	PolygonContainer::const_iterator it, it_end = polys.end();
	3417
	3418	for (it = polys.begin(); it != polys.end(); ++ it)
[463]	3419	{
[574]	3420	Polygon3 poly = it;
[463]	3421
	3422	// classify polygon
	3423	const int cf = poly->ClassifyPlane(plane, mEpsilon);
	3424
	3425	switch (cf)
	3426	{
	3427	case Polygon3::COINCIDENT:
	3428	coincident.push_back(poly);
[482]	3429	break;
	3430	case Polygon3::FRONT_SIDE:
[463]	3431	frontPolys.push_back(poly);
	3432	break;
	3433	case Polygon3::BACK_SIDE:
	3434	backPolys.push_back(poly);
	3435	break;
	3436	case Polygon3::SPLIT:
	3437	backPolys.push_back(poly);
	3438	frontPolys.push_back(poly);
	3439	++ splits;
	3440	break;
	3441	default:
	3442	Debug << "SHOULD NEVER COME HERE\n";
	3443	break;
	3444	}
	3445	}
	3446
	3447	return splits;
	3448	}
[466]	3449
	3450
[469]	3451	int VspBspTree::CastLineSegment(const Vector3 &origin,
	3452	const Vector3 &termination,
[882]	3453	ViewCellContainer &viewcells)
[466]	3454	{
[469]	3455	int hits = 0;
[719]	3456	stack<BspRayTraversalData> tStack;
[482]	3457
[469]	3458	float mint = 0.0f, maxt = 1.0f;
[482]	3459
[1291]	3460	//ViewCell::NewMail();
[482]	3461
[469]	3462	Vector3 entp = origin;
	3463	Vector3 extp = termination;
[482]	3464
[469]	3465	BspNode *node = mRoot;
	3466	BspNode *farChild = NULL;
[482]	3467
[485]	3468	float t;
[752]	3469	const float thresh = 1e-6f; // matt: change this to adjustable value
[2015]	3470
[482]	3471	while (1)
[469]	3472	{
[482]	3473	if (!node->IsLeaf())
[469]	3474	{
[2017]	3475	BspInterior in = static_cast<BspInterior >(node);
[482]	3476
[2021]	3477	Plane3 &splitPlane = in->GetPlane();
[485]	3478
[666]	3479	const int entSide = splitPlane.Side(entp, thresh);
	3480	const int extSide = splitPlane.Side(extp, thresh);
[482]	3481
[485]	3482	if (entSide < 0)
[469]	3483	{
[666]	3484	node = in->GetBack();
	3485
	3486	// plane does not split ray => no far child
	3487	if (extSide <= 0)
	3488	continue;
	3489
	3490	farChild = in->GetFront(); // plane splits ray
[485]	3491	}
	3492	else if (entSide > 0)
[469]	3493	{
[666]	3494	node = in->GetFront();
[482]	3495
[666]	3496	if (extSide >= 0) // plane does not split ray => no far child
	3497	continue;
[482]	3498
	3499	farChild = in->GetBack(); // plane splits ray
[469]	3500	}
[694]	3501	else // one of the ray end points is on the plane
[1020]	3502	{
	3503	// NOTE: what to do if ray is coincident with plane?
[485]	3504	if (extSide < 0)
	3505	node = in->GetBack();
[694]	3506	else //if (extSide > 0)
[485]	3507	node = in->GetFront();
[694]	3508	//else break; // coincident => count no intersections
	3509
[485]	3510	continue; // no far child
[469]	3511	}
[482]	3512
[469]	3513	// push data for far child
[719]	3514	tStack.push(BspRayTraversalData(farChild, extp));
[482]	3515
[469]	3516	// find intersection of ray segment with plane
	3517	extp = splitPlane.FindIntersection(origin, extp, &t);
[485]	3518	}
	3519	else
[469]	3520	{
	3521	// reached leaf => intersection with view cell
[2017]	3522	BspLeaf leaf = static_cast<BspLeaf >(node);
[666]	3523	ViewCell *viewCell;
	3524
[1020]	3525	// question: always contribute to leaf or to currently active view cell?
[2021]	3526	// if (0)
	3527	// viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
	3528	// else
	3529	viewCell = leaf->GetViewCell();
[482]	3530
[590]	3531	if (!viewCell->Mailed())
[469]	3532	{
[590]	3533	viewcells.push_back(viewCell);
	3534	viewCell->Mail();
[469]	3535	++ hits;
	3536	}
[482]	3537
[469]	3538	//-- fetch the next far child from the stack
[719]	3539	if (tStack.empty())
[469]	3540	break;
[482]	3541
[469]	3542	entp = extp;
[485]	3543
[719]	3544	const BspRayTraversalData &s = tStack.top();
[482]	3545
[469]	3546	node = s.mNode;
	3547	extp = s.mExitPoint;
[482]	3548
[719]	3549	tStack.pop();
[469]	3550	}
[466]	3551	}
[487]	3552
[469]	3553	return hits;
[466]	3554	}
[478]	3555
[576]	3556
	3557
	3558
[485]	3559	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
[482]	3560	{
	3561	std::deque<BspNode *> path1;
	3562	BspNode *p1 = n1;
[479]	3563
[482]	3564	// create path from node 1 to root
	3565	while (p1)
	3566	{
	3567	if (p1 == n2) // second node on path
	3568	return (int)path1.size();
	3569
	3570	path1.push_front(p1);
	3571	p1 = p1->GetParent();
	3572	}
	3573
	3574	int depth = n2->GetDepth();
	3575	int d = depth;
	3576
	3577	BspNode *p2 = n2;
	3578
	3579	// compare with same depth
	3580	while (1)
	3581	{
	3582	if ((d < (int)path1.size()) && (p2 == path1[d]))
	3583	return (depth - d) + ((int)path1.size() - 1 - d);
	3584
	3585	-- d;
	3586	p2 = p2->GetParent();
	3587	}
	3588
	3589	return 0; // never come here
	3590	}
	3591
[580]	3592
[501]	3593	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
[479]	3594	{
[590]	3595	// TODO
[728]	3596	#if HAS_TO_BE_REDONE
[495]	3597	if (node->IsLeaf())
[479]	3598	return node;
	3599
[2017]	3600	BspInterior interior = static_cast<BspInterior >(node);
[492]	3601
[501]	3602	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
	3603	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
[492]	3604
[479]	3605	if (front->IsLeaf() && back->IsLeaf())
	3606	{
[2017]	3607	BspLeaf frontLeaf = static_cast<BspLeaf >(front);
	3608	BspLeaf backLeaf = static_cast<BspLeaf >(back);
[479]	3609
	3610	//-- collapse tree
	3611	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
	3612	{
	3613	BspViewCell *vc = frontLeaf->GetViewCell();
	3614
	3615	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
[489]	3616	leaf->SetTreeValid(frontLeaf->TreeValid());
[482]	3617
[479]	3618	// replace a link from node's parent
	3619	if (leaf->GetParent())
	3620	leaf->GetParent()->ReplaceChildLink(node, leaf);
[517]	3621	else
	3622	mRoot = leaf;
	3623
[501]	3624	++ collapsed;
[479]	3625	delete interior;
	3626
	3627	return leaf;
	3628	}
	3629	}
[590]	3630	#endif
[495]	3631	return node;
	3632	}
	3633
	3634
[501]	3635	int VspBspTree::CollapseTree()
[495]	3636	{
[501]	3637	int collapsed = 0;
[580]	3638	//TODO
[728]	3639	#if HAS_TO_BE_REDONE
[501]	3640	(void)CollapseTree(mRoot, collapsed);
[517]	3641
[485]	3642	// revalidate leaves
[517]	3643	RepairViewCellsLeafLists();
[580]	3644	#endif
[501]	3645	return collapsed;
[479]	3646	}
	3647
	3648
[517]	3649	void VspBspTree::RepairViewCellsLeafLists()
[492]	3650	{
[590]	3651	// TODO
[728]	3652	#if HAS_TO_BE_REDONE
[479]	3653	// list not valid anymore => clear
[492]	3654	stack<BspNode *> nodeStack;
	3655	nodeStack.push(mRoot);
	3656
	3657	ViewCell::NewMail();
	3658
	3659	while (!nodeStack.empty())
	3660	{
	3661	BspNode *node = nodeStack.top();
	3662	nodeStack.pop();
	3663
	3664	if (node->IsLeaf())
	3665	{
[2017]	3666	BspLeaf leaf = static_cast<BspLeaf >(node);
[492]	3667
	3668	BspViewCell *viewCell = leaf->GetViewCell();
[590]	3669
[492]	3670	if (!viewCell->Mailed())
	3671	{
	3672	viewCell->mLeaves.clear();
	3673	viewCell->Mail();
	3674	}
[580]	3675
[492]	3676	viewCell->mLeaves.push_back(leaf);
[590]	3677
[492]	3678	}
	3679	else
	3680	{
[2017]	3681	BspInterior interior = static_cast<BspInterior >(node);
[492]	3682
	3683	nodeStack.push(interior->GetFront());
	3684	nodeStack.push(interior->GetBack());
	3685	}
[479]	3686	}
[590]	3687	// TODO
	3688	#endif
[479]	3689	}
	3690
	3691
[532]	3692	int VspBspTree::CastBeam(Beam &beam)
	3693	{
	3694	stack<bspNodePair> nodeStack;
	3695	BspNodeGeometry *rgeom = new BspNodeGeometry();
	3696	ConstructGeometry(mRoot, *rgeom);
	3697
	3698	nodeStack.push(bspNodePair(mRoot, rgeom));
	3699
	3700	ViewCell::NewMail();
	3701
	3702	while (!nodeStack.empty())
	3703	{
	3704	BspNode *node = nodeStack.top().first;
	3705	BspNodeGeometry *geom = nodeStack.top().second;
	3706	nodeStack.pop();
	3707
	3708	AxisAlignedBox3 box;
[697]	3709	geom->GetBoundingBox(box);
[532]	3710
[535]	3711	const int side = beam.ComputeIntersection(box);
[532]	3712
	3713	switch (side)
	3714	{
	3715	case -1:
[547]	3716	CollectViewCells(node, true, beam.mViewCells, true);
[532]	3717	break;
	3718	case 0:
[535]	3719
[532]	3720	if (node->IsLeaf())
	3721	{
[2017]	3722	BspLeaf leaf = static_cast<BspLeaf >(node);
[535]	3723
[532]	3724	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
[535]	3725	{
	3726	leaf->GetViewCell()->Mail();
[532]	3727	beam.mViewCells.push_back(leaf->GetViewCell());
[535]	3728	}
[532]	3729	}
	3730	else
	3731	{
[2017]	3732	BspInterior interior = static_cast<BspInterior >(node);
[535]	3733
[538]	3734	BspNode *first = interior->GetFront();
	3735	BspNode *second = interior->GetBack();
[535]	3736
	3737	BspNodeGeometry *firstGeom = new BspNodeGeometry();
	3738	BspNodeGeometry *secondGeom = new BspNodeGeometry();
	3739
[538]	3740	geom->SplitGeometry(*firstGeom,
	3741	*secondGeom,
	3742	interior->GetPlane(),
[1563]	3743	mBoundingBox,
[675]	3744	//0.0000001f);
[538]	3745	mEpsilon);
[535]	3746
[532]	3747	// decide on the order of the nodes
	3748	if (DotProd(beam.mPlanes[0].mNormal,
	3749	interior->GetPlane().mNormal) > 0)
	3750	{
	3751	swap(first, second);
[535]	3752	swap(firstGeom, secondGeom);
[532]	3753	}
	3754
[535]	3755	nodeStack.push(bspNodePair(first, firstGeom));
	3756	nodeStack.push(bspNodePair(second, secondGeom));
[532]	3757	}
[535]	3758
[532]	3759	break;
[538]	3760	default:
[532]	3761	// default: cull
[538]	3762	break;
[532]	3763	}
[538]	3764
[532]	3765	DEL_PTR(geom);
[535]	3766
[532]	3767	}
	3768
[538]	3769	return (int)beam.mViewCells.size();
[532]	3770	}
	3771
	3772
[485]	3773	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
[478]	3774	{
[485]	3775	mViewCellsManager = vcm;
	3776	}
	3777
	3778
[580]	3779	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
	3780	vector<MergeCandidate> &candidates)
[485]	3781	{
[478]	3782	BspLeaf::NewMail();
[508]	3783
[478]	3784	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
	3785
[580]	3786	int numCandidates = 0;
[509]	3787
[478]	3788	// find merge candidates and push them into queue
	3789	for (it = leaves.begin(); it != it_end; ++ it)
	3790	{
	3791	BspLeaf leaf = it;
[485]	3792
	3793	// the same leaves must not be part of two merge candidates
	3794	leaf->Mail();
[650]	3795
[485]	3796	vector<BspLeaf *> neighbors;
[710]	3797
	3798	// appoximate neighbor search has slightl relaxed constraints
[694]	3799	if (1)
[650]	3800	FindNeighbors(leaf, neighbors, true);
	3801	else
	3802	FindApproximateNeighbors(leaf, neighbors, true);
[710]	3803
[485]	3804	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
	3805
	3806	// TODO: test if at least one ray goes from one leaf to the other
	3807	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
[508]	3808	{
	3809	if ((*nit)->GetViewCell() != leaf->GetViewCell())
[509]	3810	{
[580]	3811	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
[564]	3812
[1006]	3813	if (!leaf->GetViewCell()->GetPvs().Empty() \|\|
[710]	3814	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
[676]	3815	leaf->IsSibling(*nit))
	3816	{
	3817	candidates.push_back(mc);
	3818	}
	3819
[580]	3820	++ numCandidates;
	3821	if ((numCandidates % 1000) == 0)
[566]	3822	{
[580]	3823	cout << "collected " << numCandidates << " merge candidates" << endl;
[566]	3824	}
[509]	3825	}
[485]	3826	}
	3827	}
	3828
[580]	3829	Debug << "merge queue: " << (int)candidates.size() << endl;
	3830	Debug << "leaves in queue: " << numCandidates << endl;
	3831
[508]	3832
[485]	3833	return (int)leaves.size();
	3834	}
	3835
	3836
[580]	3837	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
	3838	vector<MergeCandidate> &candidates)
[485]	3839	{
[547]	3840	ViewCell::NewMail();
[503]	3841	long startTime = GetTime();
[574]	3842
[485]	3843	map<BspLeaf , vector<BspLeaf> > neighborMap;
[574]	3844	ViewCellContainer::const_iterator iit;
[485]	3845
[503]	3846	int numLeaves = 0;
[485]	3847
	3848	BspLeaf::NewMail();
	3849
[574]	3850	for (int i = 0; i < (int)rays.size(); ++ i)
[485]	3851	{
[574]	3852	VssRay *ray = rays[i];
[547]	3853
[485]	3854	// traverse leaves stored in the rays and compare and
	3855	// merge consecutive leaves (i.e., the neighbors in the tree)
[574]	3856	if (ray->mViewCells.size() < 2)
[485]	3857	continue;
[1551]	3858
[574]	3859	iit = ray->mViewCells.begin();
[2017]	3860	BspViewCell bspVc = static_cast<BspViewCell >(*(iit ++));
[1551]	3861	BspLeaf *leaf = bspVc->mLeaves[0];
[485]	3862
	3863	// traverse intersections
[489]	3864	// consecutive leaves are neighbors => add them to queue
[574]	3865	for (; iit != ray->mViewCells.end(); ++ iit)
[485]	3866	{
[489]	3867	// next pair
	3868	BspLeaf *prevLeaf = leaf;
[2017]	3869	bspVc = static_cast<BspViewCell >(iit);
[1551]	3870	leaf = bspVc->mLeaves[0]; // exactly one leaf
[489]	3871
[508]	3872	// view space not valid or same view cell
	3873	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
	3874	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
[489]	3875	continue;
	3876
[580]	3877	vector<BspLeaf *> &neighbors = neighborMap[leaf];
[485]	3878
	3879	bool found = false;
[478]	3880
[485]	3881	// both leaves inserted in queue already =>
	3882	// look if double pair already exists
	3883	if (leaf->Mailed() && prevLeaf->Mailed())
[478]	3884	{
[485]	3885	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
	3886
	3887	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
	3888	if (*it == prevLeaf)
	3889	found = true; // already in queue
	3890	}
[547]	3891
[485]	3892	if (!found)
	3893	{
[564]	3894	// this pair is not in map yet
[485]	3895	// => insert into the neighbor map and the queue
	3896	neighbors.push_back(prevLeaf);
	3897	neighborMap[prevLeaf].push_back(leaf);
[478]	3898
[485]	3899	leaf->Mail();
	3900	prevLeaf->Mail();
[547]	3901
[580]	3902	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
	3903
	3904	candidates.push_back(mc);
[564]	3905
[580]	3906	if (((int)candidates.size() % 1000) == 0)
[564]	3907	{
[580]	3908	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
[564]	3909	}
[478]	3910	}
[485]	3911	}
	3912	}
[564]	3913
[485]	3914	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
[580]	3915	Debug << "merge queue: " << (int)candidates.size() << endl;
[503]	3916	Debug << "leaves in queue: " << numLeaves << endl;
[485]	3917
[580]	3918
[503]	3919	//-- collect the leaves which haven't been found by ray casting
[542]	3920	if (0)
	3921	{
[551]	3922	cout << "finding additional merge candidates using geometry" << endl;
[542]	3923	vector<BspLeaf *> leaves;
[547]	3924	CollectLeaves(leaves, true);
[542]	3925	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
[580]	3926	CollectMergeCandidates(leaves, candidates);
[542]	3927	}
[503]	3928
	3929	return numLeaves;
[485]	3930	}
	3931
	3932
	3933
	3934
[879]	3935	ViewCell *VspBspTree::GetViewCell(const Vector3 &point, const bool active)
[492]	3936	{
[879]	3937	if (mRoot == NULL)
	3938	return NULL;
	3939
	3940	stack<BspNode *> nodeStack;
	3941	nodeStack.push(mRoot);
[492]	3942
[882]	3943	ViewCellLeaf *viewcell = NULL;
[492]	3944
[879]	3945	while (!nodeStack.empty())
	3946	{
	3947	BspNode *node = nodeStack.top();
	3948	nodeStack.pop();
[492]	3949
[879]	3950	if (node->IsLeaf())
	3951	{
[2017]	3952	viewcell = static_cast<BspLeaf *>(node)->GetViewCell();
[879]	3953	break;
	3954	}
	3955	else
	3956	{
[2017]	3957	BspInterior interior = static_cast<BspInterior >(node);
[879]	3958
	3959	// random decision
	3960	if (interior->GetPlane().Side(point) < 0)
	3961	nodeStack.push(interior->GetBack());
	3962	else
	3963	nodeStack.push(interior->GetFront());
	3964	}
[492]	3965	}
	3966
[879]	3967	if (active)
	3968	return mViewCellsTree->GetActiveViewCell(viewcell);
	3969	else
	3970	return viewcell;
[492]	3971	}
	3972
	3973
[487]	3974	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
	3975	{
	3976	BspNode *node = mRoot;
[485]	3977
[487]	3978	while (1)
	3979	{
	3980	// early exit
	3981	if (node->TreeValid())
	3982	return true;
	3983
	3984	if (node->IsLeaf())
	3985	return false;
	3986
[2017]	3987	BspInterior in = static_cast<BspInterior >(node);
[490]	3988
	3989	if (in->GetPlane().Side(viewPoint) <= 0)
[487]	3990	{
	3991	node = in->GetBack();
	3992	}
	3993	else
	3994	{
	3995	node = in->GetFront();
	3996	}
	3997	}
	3998
	3999	// should never come here
	4000	return false;
	4001	}
	4002
	4003
	4004	void VspBspTree::PropagateUpValidity(BspNode *node)
	4005	{
[574]	4006	const bool isValid = node->TreeValid();
	4007
	4008	// propagative up invalid flag until only invalid nodes exist over this node
	4009	if (!isValid)
[487]	4010	{
[574]	4011	while (!node->IsRoot() && node->GetParent()->TreeValid())
	4012	{
	4013	node = node->GetParent();
	4014	node->SetTreeValid(false);
	4015	}
[487]	4016	}
[574]	4017	else
	4018	{
	4019	// propagative up valid flag until one of the subtrees is invalid
	4020	while (!node->IsRoot() && !node->TreeValid())
	4021	{
	4022	node = node->GetParent();
[2017]	4023	BspInterior interior = static_cast<BspInterior >(node);
[574]	4024
	4025	// the parent is valid iff both leaves are valid
	4026	node->SetTreeValid(interior->GetBack()->TreeValid() &&
	4027	interior->GetFront()->TreeValid());
	4028	}
	4029	}
[487]	4030	}
	4031
[1201]	4032
	4033	bool VspBspTree::Export(OUT_STREAM &stream)
[503]	4034	{
[508]	4035	ExportNode(mRoot, stream);
[503]	4036	return true;
	4037	}
	4038
[1201]	4039
	4040	void VspBspTree::ExportNode(BspNode *node, OUT_STREAM &stream)
[508]	4041	{
	4042	if (node->IsLeaf())
[503]	4043	{
[2017]	4044	BspLeaf leaf = static_cast<BspLeaf >(node);
[590]	4045	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
	4046
[508]	4047	int id = -1;
[590]	4048	if (viewCell != mOutOfBoundsCell)
	4049	id = viewCell->GetId();
[503]	4050
[508]	4051	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
[503]	4052	}
[508]	4053	else
[503]	4054	{
[2017]	4055	BspInterior interior = static_cast<BspInterior >(node);
[508]	4056
	4057	Plane3 plane = interior->GetPlane();
	4058	stream << "<Interior plane=\"" << plane.mNormal.x << " "
	4059	<< plane.mNormal.y << " " << plane.mNormal.z << " "
	4060	<< plane.mD << "\">" << endl;
[503]	4061
[508]	4062	ExportNode(interior->GetBack(), stream);
	4063	ExportNode(interior->GetFront(), stream);
[503]	4064
[508]	4065	stream << "</Interior>" << endl;
[503]	4066	}
	4067	}
[860]	4068
[1580]	4069	}

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