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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 656

Revision 656, 83.9 KB checked in by mattausch, 19 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"
[463]	19
[639]	20	#define USE_FIXEDPOINT_T 0
[590]	21
[639]	22
[463]	23	//-- static members
[508]	24
[482]	25	/** Evaluates split plane classification with respect to the plane's
[463]	26	contribution for a minimum number of ray splits.
	27	*/
	28	const float VspBspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0};
[482]	29	/** Evaluates split plane classification with respect to the plane's
[580]	30	contribution for balanced rays.
[463]	31	*/
	32	const float VspBspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0};
	33
	34
[482]	35	int VspBspTree::sFrontId = 0;
[463]	36	int VspBspTree::sBackId = 0;
	37	int VspBspTree::sFrontAndBackId = 0;
	38
	39
[557]	40
[578]	41
[579]	42	// pvs penalty can be different from pvs size
	43	inline float EvalPvsPenalty(const int pvs,
	44	const int lower,
	45	const int upper)
	46	{
	47	// clamp to minmax values
	48	if (pvs < lower)
	49	return (float)lower;
	50	if (pvs > upper)
	51	return (float)upper;
[578]	52
[579]	53	return (float)pvs;
	54	}
[463]	55
[557]	56
[579]	57
	58
[601]	59	/******************************************************************************/
	60	/* class VspBspTree implementation */
	61	/******************************************************************************/
[579]	62
	63
[482]	64	VspBspTree::VspBspTree():
[463]	65	mRoot(NULL),
[547]	66	mUseAreaForPvs(false),
[478]	67	mCostNormalizer(Limits::Small),
	68	mViewCellsManager(NULL),
[497]	69	mOutOfBoundsCell(NULL),
[643]	70	mStoreRays(false),
[605]	71	mRenderCostWeight(0.5),
[610]	72	mUseRandomAxis(false),
[650]	73	mTimeStamp(1)
[463]	74	{
[486]	75	bool randomize = false;
	76	environment->GetBoolValue("VspBspTree.Construction.randomize", randomize);
	77	if (randomize)
	78	Randomize(); // initialise random generator for heuristics
[463]	79
	80	//-- termination criteria for autopartition
	81	environment->GetIntValue("VspBspTree.Termination.maxDepth", mTermMaxDepth);
	82	environment->GetIntValue("VspBspTree.Termination.minPvs", mTermMinPvs);
	83	environment->GetIntValue("VspBspTree.Termination.minRays", mTermMinRays);
[547]	84	environment->GetFloatValue("VspBspTree.Termination.minProbability", mTermMinProbability);
[463]	85	environment->GetFloatValue("VspBspTree.Termination.maxRayContribution", mTermMaxRayContribution);
	86	environment->GetFloatValue("VspBspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
[472]	87	environment->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
	88	environment->GetIntValue("VspBspTree.Termination.missTolerance", mTermMissTolerance);
[564]	89	environment->GetIntValue("VspBspTree.Termination.maxViewCells", mMaxViewCells);
	90	//-- max cost ratio for early tree termination
	91	environment->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
[610]	92
[654]	93	environment->GetFloatValue("VspBspTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
	94	environment->GetIntValue("VspBspTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
[610]	95
[654]	96	// HACK//mTermMinPolygons = 25;
	97
[463]	98	//-- factors for bsp tree split plane heuristics
	99	environment->GetFloatValue("VspBspTree.Factor.balancedRays", mBalancedRaysFactor);
	100	environment->GetFloatValue("VspBspTree.Factor.pvs", mPvsFactor);
	101	environment->GetFloatValue("VspBspTree.Termination.ct_div_ci", mCtDivCi);
	102
[482]	103
[463]	104	//-- partition criteria
	105	environment->GetIntValue("VspBspTree.maxPolyCandidates", mMaxPolyCandidates);
	106	environment->GetIntValue("VspBspTree.maxRayCandidates", mMaxRayCandidates);
	107	environment->GetIntValue("VspBspTree.splitPlaneStrategy", mSplitPlaneStrategy);
	108
	109	environment->GetFloatValue("VspBspTree.Construction.epsilon", mEpsilon);
	110	environment->GetIntValue("VspBspTree.maxTests", mMaxTests);
	111
[564]	112	// if only the driving axis is used for axis aligned split
[551]	113	environment->GetBoolValue("VspBspTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
[580]	114
[508]	115	//-- termination criteria for axis aligned split
	116	environment->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
	117	mTermMaxRayContriForAxisAligned);
	118	environment->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
	119	mTermMinRaysForAxisAligned);
[487]	120
[508]	121	//environment->GetFloatValue("VspBspTree.maxTotalMemory", mMaxTotalMemory);
	122	environment->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
	123
[580]	124	environment->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
[607]	125	environment->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
[547]	126
[600]	127	mSubdivisionStats.open("subdivisionStats.log");
[580]	128
[612]	129	environment->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
[655]	130	environment->GetBoolValue("VspBspTree.useSplitCostQueue", mUseSplitCostQueue);
[580]	131
[612]	132
[478]	133	//-- debug output
[580]	134
[473]	135	Debug << "***** VSP BSP options ****** " << endl;
	136	Debug << "max depth: " << mTermMaxDepth << endl;
	137	Debug << "min PVS: " << mTermMinPvs << endl;
[547]	138	Debug << "min probabiliy: " << mTermMinProbability << endl;
[473]	139	Debug << "min rays: " << mTermMinRays << endl;
	140	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
	141	//Debug << "VSP BSP mininam accumulated ray lenght: ", mTermMinAccRayLength) << endl;
	142	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
	143	Debug << "miss tolerance: " << mTermMissTolerance << endl;
	144	Debug << "max view cells: " << mMaxViewCells << endl;
	145	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
	146	Debug << "max plane candidates: " << mMaxRayCandidates << endl;
[486]	147	Debug << "randomize: " << randomize << endl;
[582]	148
[551]	149	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
[580]	150	Debug << "render cost weight: " << mRenderCostWeight << endl;
[463]	151	Debug << "Split plane strategy: ";
[564]	152
[463]	153	if (mSplitPlaneStrategy & RANDOM_POLYGON)
[474]	154	{
[463]	155	Debug << "random polygon ";
[474]	156	}
[463]	157	if (mSplitPlaneStrategy & AXIS_ALIGNED)
[472]	158	{
[463]	159	Debug << "axis aligned ";
[472]	160	}
[463]	161	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
[472]	162	{
[474]	163	mCostNormalizer += mLeastRaySplitsFactor;
[463]	164	Debug << "least ray splits ";
[472]	165	}
[463]	166	if (mSplitPlaneStrategy & BALANCED_RAYS)
[472]	167	{
[474]	168	mCostNormalizer += mBalancedRaysFactor;
[463]	169	Debug << "balanced rays ";
[472]	170	}
[463]	171	if (mSplitPlaneStrategy & PVS)
[472]	172	{
[474]	173	mCostNormalizer += mPvsFactor;
[463]	174	Debug << "pvs";
[472]	175	}
[482]	176
[489]	177
[480]	178	mSplitCandidates = new vector<SortableEntry>;
[463]	179
	180	Debug << endl;
	181	}
	182
[580]	183
[508]	184	BspViewCell *VspBspTree::GetOutOfBoundsCell()
	185	{
	186	return mOutOfBoundsCell;
	187	}
[463]	188
[508]	189
[489]	190	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
	191	{
	192	if (!mOutOfBoundsCell)
[508]	193	{
[489]	194	mOutOfBoundsCell = new BspViewCell();
[508]	195	mOutOfBoundsCell->SetId(-1);
[547]	196	mOutOfBoundsCell->SetValid(false);
[508]	197	}
[547]	198
[489]	199	return mOutOfBoundsCell;
	200	}
	201
	202
[482]	203	const BspTreeStatistics &VspBspTree::GetStatistics() const
[463]	204	{
[574]	205	return mBspStats;
[463]	206	}
	207
	208
	209	VspBspTree::~VspBspTree()
	210	{
	211	DEL_PTR(mRoot);
[480]	212	DEL_PTR(mSplitCandidates);
[463]	213	}
	214
[579]	215
[482]	216	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
	217	PolygonContainer &polys,
[463]	218	MeshInstance *parent)
	219	{
	220	FaceContainer::const_iterator fi;
[482]	221
[463]	222	// copy the face data to polygons
	223	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
	224	{
	225	Polygon3 poly = new Polygon3((fi), mesh);
[482]	226
[463]	227	if (poly->Valid(mEpsilon))
	228	{
	229	poly->mParent = parent; // set parent intersectable
	230	polys.push_back(poly);
	231	}
	232	else
	233	DEL_PTR(poly);
	234	}
	235	return (int)mesh->mFaces.size();
	236	}
	237
[580]	238
[482]	239	int VspBspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
	240	PolygonContainer &polys,
[463]	241	int maxObjects)
	242	{
[482]	243	int limit = (maxObjects > 0) ?
[463]	244	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
[482]	245
[463]	246	int polysSize = 0;
	247
	248	for (int i = 0; i < limit; ++ i)
	249	{
	250	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
	251	{
	252	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
[482]	253	polysSize +=
	254	AddMeshToPolygons(viewCells[i]->GetMesh(),
	255	polys,
[463]	256	viewCells[i]);
	257	}
	258	}
	259
	260	return polysSize;
	261	}
	262
[580]	263
[482]	264	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
	265	PolygonContainer &polys,
[463]	266	int maxObjects)
	267	{
[482]	268	int limit = (maxObjects > 0) ?
[463]	269	Min((int)objects.size(), maxObjects) : (int)objects.size();
[482]	270
[463]	271	for (int i = 0; i < limit; ++i)
	272	{
	273	Intersectable object = objects[i];//it;
	274	Mesh *mesh = NULL;
	275
	276	switch (object->Type()) // extract the meshes
	277	{
	278	case Intersectable::MESH_INSTANCE:
	279	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
	280	break;
	281	case Intersectable::VIEW_CELL:
	282	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
	283	break;
	284	// TODO: handle transformed mesh instances
	285	default:
	286	Debug << "intersectable type not supported" << endl;
	287	break;
	288	}
[482]	289
[463]	290	if (mesh) // copy the mesh data to polygons
	291	{
	292	mBox.Include(object->GetBox()); // add to BSP tree aabb
[485]	293	AddMeshToPolygons(mesh, polys, NULL);
[463]	294	}
	295	}
	296
	297	return (int)polys.size();
	298	}
	299
[580]	300
[483]	301	void VspBspTree::Construct(const VssRayContainer &sampleRays,
	302	AxisAlignedBox3 *forcedBoundingBox)
[463]	303	{
[574]	304	mBspStats.nodes = 1;
[463]	305	mBox.Initialize(); // initialise BSP tree bounding box
[482]	306
[484]	307	if (forcedBoundingBox)
	308	mBox = *forcedBoundingBox;
	309
[463]	310	PolygonContainer polys;
	311	RayInfoContainer *rays = new RayInfoContainer();
	312
	313	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
	314
	315	long startTime = GetTime();
	316
[480]	317	cout << "Extracting polygons from rays ... ";
[463]	318
	319	Intersectable::NewMail();
	320
[511]	321	int numObj = 0;
[542]	322
[463]	323	//-- extract polygons intersected by the rays
	324	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	325	{
	326	VssRay ray = rit;
[482]	327
[484]	328	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
	329	ray->mTerminationObject &&
	330	!ray->mTerminationObject->Mailed())
[463]	331	{
	332	ray->mTerminationObject->Mail();
	333	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
	334	AddMeshToPolygons(obj->GetMesh(), polys, obj);
[511]	335	++ numObj;
[648]	336
[484]	337	//-- compute bounding box
	338	if (!forcedBoundingBox)
	339	mBox.Include(ray->mTermination);
[463]	340	}
	341
[484]	342	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
	343	ray->mOriginObject &&
	344	!ray->mOriginObject->Mailed())
[463]	345	{
	346	ray->mOriginObject->Mail();
	347	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
	348	AddMeshToPolygons(obj->GetMesh(), polys, obj);
[511]	349	++ numObj;
	350
[484]	351	//-- compute bounding box
	352	if (!forcedBoundingBox)
	353	mBox.Include(ray->mOrigin);
[463]	354	}
	355	}
[535]	356
[653]	357	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
	358	<< mViewCellsManager->GetMaxPvsSize() << endl;
[580]	359
[463]	360	//-- store rays
	361	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	362	{
	363	VssRay ray = rit;
[482]	364
[463]	365	float minT, maxT;
	366
[564]	367	static Ray hray;
	368	hray.Init(*ray);
[562]	369
[483]	370	// TODO: not very efficient to implictly cast between rays types
[564]	371	if (mBox.GetRaySegment(hray, minT, maxT))
[463]	372	{
	373	float len = ray->Length();
[482]	374
	375	if (!len)
[463]	376	len = Limits::Small;
[482]	377
[463]	378	rays->push_back(RayInfo(ray, minT / len, maxT / len));
	379	}
	380	}
	381
[587]	382	// normalize
[547]	383	if (mUseAreaForPvs)
[587]	384	mTermMinProbability *= mBox.SurfaceArea();
[547]	385	else
	386	mTermMinProbability *= mBox.GetVolume();
	387
[648]	388	// throw out unnecessary polygons
	389	PreprocessPolygons(polys);
	390
[574]	391	mBspStats.polys = (int)polys.size();
[463]	392
[654]	393	mGlobalCostMisses = 0;
	394
[475]	395	cout << "finished" << endl;
[463]	396
[482]	397	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
[475]	398	<< (int)sampleRays.size() << " rays in "
	399	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
	400
[655]	401	// use split cost priority queue
	402	if (mUseSplitCostQueue)
	403	{
[654]	404	ConstructWithSplitQueue(polys, rays);
[655]	405	}
[654]	406	else
[655]	407	{
[654]	408	Construct(polys, rays);
[655]	409	}
[463]	410
	411	// clean up polygons
	412	CLEAR_CONTAINER(polys);
	413	}
	414
[508]	415
[612]	416	// TODO: return memory usage in MB
[656]	417	float VspBspTree::GetMemUsage() const
[508]	418	{
[656]	419	return (float)
	420	(sizeof(VspBspTree) +
	421	mBspStats.Leaves() * sizeof(BspLeaf) +
	422	mCreatedViewCells * sizeof(BspViewCell) +
	423	mBspStats.pvs * sizeof(ObjectPvsData) +
	424	mBspStats.Interior() * sizeof(BspInterior) +
	425	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
[508]	426	}
	427
	428
	429
[463]	430	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
	431	{
[600]	432	VspBspTraversalQueue tQueue;
[463]	433
	434	mRoot = new BspLeaf();
	435
	436	// constrruct root node geometry
	437	BspNodeGeometry *geom = new BspNodeGeometry();
	438	ConstructGeometry(mRoot, *geom);
	439
[547]	440	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
	441
[482]	442	VspBspTraversalData tData(mRoot,
	443	new PolygonContainer(polys),
[463]	444	0,
[482]	445	rays,
	446	ComputePvsSize(*rays),
[547]	447	prop,
[463]	448	geom);
[611]	449	#if OCTREE_HACK
	450	tData.mAxis = 0;
	451	#endif
[578]	452	// first node is kd node, i.e. an axis aligned box
	453	if (1)
	454	tData.mIsKdNode = true;
	455	else
	456	tData.mIsKdNode = false;
[562]	457
[600]	458	tQueue.push(tData);
[463]	459
[609]	460
[605]	461	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
[607]	462	mTotalPvsSize = tData.mPvs;
	463
[601]	464	mSubdivisionStats
[605]	465	<< "#ViewCells\n1\n" << endl
[601]	466	<< "#RenderCostDecrease\n0\n" << endl
[607]	467	<< "#TotalRenderCost\n" << mTotalCost << endl
	468	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
[601]	469
[600]	470	Debug << "total cost: " << mTotalCost << endl;
	471
[601]	472
[574]	473	mBspStats.Start();
[542]	474	cout << "Contructing vsp bsp tree ... \n";
[463]	475
[542]	476	long startTime = GetTime();
[612]	477	int nLeaves = 0;
	478	int nViewCells = 0;
[587]	479
	480	// used for intermediate time measurements and progress
[542]	481	long interTime = GetTime();
[547]	482
[542]	483	mOutOfMemory = false;
[482]	484
[612]	485	mCreatedViewCells = 0;
	486
[600]	487	while (!tQueue.empty())
[463]	488	{
[600]	489	tData = tQueue.top();
	490	tQueue.pop();
[463]	491
[508]	492	if (0 && !mOutOfMemory)
	493	{
	494	float mem = GetMemUsage();
[478]	495
[508]	496	if (mem > mMaxMemory)
	497	{
	498	mOutOfMemory = true;
	499	Debug << "memory limit reached: " << mem << endl;
	500	}
	501	}
	502
[587]	503	// subdivide leaf node
[600]	504	BspNode *r = Subdivide(tQueue, tData);
[463]	505
	506	if (r == mRoot)
[482]	507	Debug << "VSP BSP tree construction time spent at root: "
[542]	508	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
	509
[654]	510	if (mBspStats.Leaves() >= nLeaves)
[542]	511	{
[612]	512	nLeaves += 500;
	513
[574]	514	cout << "leaves=" << mBspStats.Leaves() << endl;
[542]	515	Debug << "needed "
[587]	516	<< TimeDiff(interTime, GetTime())*1e-3
[612]	517	<< " secs to create 500 view cells" << endl;
[542]	518	interTime = GetTime();
	519	}
[612]	520
	521	if (mCreatedViewCells == nViewCells)
	522	{
	523	nViewCells += 500;
	524
	525	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
	526	}
[463]	527	}
	528
[542]	529	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
[463]	530	cout << "finished\n";
	531
[574]	532	mBspStats.Stop();
[463]	533	}
	534
[508]	535
[653]	536
[654]	537	void VspBspTree::ConstructWithSplitQueue(const PolygonContainer &polys,
[653]	538	RayInfoContainer *rays)
	539	{
	540	VspBspSplitQueue tQueue;
	541
	542	mRoot = new BspLeaf();
	543
	544	// constrruct root node geometry
	545	BspNodeGeometry *geom = new BspNodeGeometry();
	546	ConstructGeometry(mRoot, *geom);
	547
	548	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
	549
	550	VspBspTraversalData tData(mRoot,
	551	new PolygonContainer(polys),
	552	0,
	553	rays,
	554	ComputePvsSize(*rays),
	555	prop,
	556	geom);
	557
	558	VspBspSplitCandidate splitCandidate;
	559
	560
	561	EvalSplitCandidate(tData, splitCandidate);
	562
	563	tQueue.push(splitCandidate);
	564
	565	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
	566	mTotalPvsSize = tData.mPvs;
	567
	568	mSubdivisionStats
	569	<< "#ViewCells\n1\n" << endl
	570	<< "#RenderCostDecrease\n0\n" << endl
[654]	571	<< "#dummy\n0\n" << endl
[653]	572	<< "#TotalRenderCost\n" << mTotalCost << endl
	573	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
	574
	575	Debug << "total cost: " << mTotalCost << endl;
	576
	577
	578	mBspStats.Start();
	579	cout << "Contructing vsp bsp tree ... \n";
	580
	581	long startTime = GetTime();
	582	int nLeaves = 0;
	583	int nViewCells = 0;
	584
	585	// used for intermediate time measurements and progress
	586	long interTime = GetTime();
	587
	588	mOutOfMemory = false;
	589
	590	mCreatedViewCells = 0;
	591
	592	while (!tQueue.empty())
	593	{
	594	splitCandidate = tQueue.top();
	595	tQueue.pop();
	596
[654]	597	// cost ratio of cost decrease / totalCost
	598	float costRatio = splitCandidate.GetCost() / mTotalCost;
	599
[655]	600	//Debug << "cost ratio: " << costRatio << endl;
[654]	601
	602	if (costRatio < mTermMinGlobalCostRatio)
	603	++ mGlobalCostMisses;
[655]	604
[653]	605	if (0 && !mOutOfMemory)
	606	{
	607	float mem = GetMemUsage();
	608
	609	if (mem > mMaxMemory)
	610	{
	611	mOutOfMemory = true;
	612	Debug << "memory limit reached: " << mem << endl;
	613	}
	614	}
	615
	616	// subdivide leaf node
	617	BspNode *r = Subdivide(tQueue, splitCandidate);
	618
	619	if (r == mRoot)
	620	Debug << "VSP BSP tree construction time spent at root: "
	621	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
	622
[654]	623	if (mBspStats.Leaves() >= nLeaves)
[653]	624	{
	625	nLeaves += 500;
	626
	627	cout << "leaves=" << mBspStats.Leaves() << endl;
	628	Debug << "needed "
	629	<< TimeDiff(interTime, GetTime())*1e-3
	630	<< " secs to create 500 view cells" << endl;
	631	interTime = GetTime();
	632	}
	633
	634	if (mCreatedViewCells == nViewCells)
	635	{
	636	nViewCells += 500;
	637
	638	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
	639	}
	640	}
	641
	642	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
	643	cout << "finished\n";
	644
	645	mBspStats.Stop();
	646	}
	647
	648
[654]	649	bool VspBspTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
[463]	650	{
[482]	651	return
[463]	652	(((int)data.mRays->size() <= mTermMinRays) \|\|
[473]	653	(data.mPvs <= mTermMinPvs) \|\|
[547]	654	(data.mProbability <= mTermMinProbability) \|\|
[535]	655	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
[463]	656	(data.mDepth >= mTermMaxDepth));
	657	}
	658
[508]	659
[654]	660	bool VspBspTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
	661	{
	662	return
	663	(mOutOfMemory
	664	\|\| (mBspStats.Leaves() >= mMaxViewCells)
	665	\|\| (mGlobalCostMisses >= mTermGlobalCostMissTolerance)
	666	);
	667	}
	668
	669
	670
[600]	671	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
[463]	672	VspBspTraversalData &tData)
	673	{
[473]	674	BspNode *newNode = tData.mNode;
	675
[654]	676	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
[473]	677	{
	678	PolygonContainer coincident;
[482]	679
[473]	680	VspBspTraversalData tFrontData;
	681	VspBspTraversalData tBackData;
[612]	682
[611]	683	#if OCTREE_HACK
	684	//Debug << "new axis:" << (tData.mAxis + 1) % 3 << endl;
	685	tFrontData.mAxis = (tData.mAxis + 1) % 3;
	686	tBackData.mAxis = (tData.mAxis + 1) % 3;
	687	#endif
[473]	688	// create new interior node and two leaf nodes
	689	// or return leaf as it is (if maxCostRatio missed)
	690
[653]	691	int splitAxis;
	692	bool splitFurther = true;
	693	int maxCostMisses = tData.mMaxCostMisses;
	694
	695	Plane3 splitPlane;
	696	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
	697
	698	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
[473]	699	{
[653]	700	++ maxCostMisses;
	701
	702	if (maxCostMisses > mTermMissTolerance)
	703	{
	704	// terminate branch because of max cost
	705	++ mBspStats.maxCostNodes;
	706	splitFurther = false;
	707	}
	708	}
	709
	710	if (splitFurther) //-- continue subdivision
	711	{
	712	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
	713
	714	if (splitAxis < 3)
	715	++ mBspStats.splits[splitAxis];
	716	else
	717	++ mBspStats.polySplits;
	718
	719	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && splitAxis < 3);
	720	// how often was max cost ratio missed in this branch?
	721	tFrontData.mMaxCostMisses = maxCostMisses;
	722	tBackData.mMaxCostMisses = maxCostMisses;
	723
[600]	724	if (1)
	725	{
[611]	726	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	727	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	728	float cData = (float)tData.mPvs * tData.mProbability;;
[605]	729
[607]	730	float costDecr =
[605]	731	(cFront + cBack - cData) / mBox.GetVolume();
[607]	732
[600]	733	mTotalCost += costDecr;
[607]	734	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
[600]	735
	736	mSubdivisionStats
[605]	737	<< "#ViewCells\n" << mBspStats.Leaves() << endl
[600]	738	<< "#RenderCostDecrease\n" << -costDecr << endl
[607]	739	<< "#TotalRenderCost\n" << mTotalCost << endl
[650]	740	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
[600]	741	}
	742
[473]	743	// push the children on the stack
[600]	744	tQueue.push(tFrontData);
	745	tQueue.push(tBackData);
[473]	746
	747	// delete old leaf node
[482]	748	DEL_PTR(tData.mNode);
[473]	749	}
	750	}
[482]	751
[478]	752	//-- terminate traversal and create new view cell
[473]	753	if (newNode->IsLeaf())
[463]	754	{
[473]	755	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
[547]	756	BspViewCell *viewCell = new BspViewCell();
[489]	757
[463]	758	leaf->SetViewCell(viewCell);
[487]	759
	760	//-- update pvs
[556]	761	int conSamp = 0;
	762	float sampCon = 0.0f;
	763	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
[487]	764
[574]	765	mBspStats.contributingSamples += conSamp;
	766	mBspStats.sampleContributions +=(int) sampCon;
[487]	767
	768	//-- store additional info
[478]	769	if (mStoreRays)
	770	{
	771	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
	772	for (it = tData.mRays->begin(); it != it_end; ++ it)
[639]	773	{
	774	(*it).mRay->Ref();
[478]	775	leaf->mVssRays.push_back((*it).mRay);
[639]	776	}
[478]	777	}
[612]	778
[564]	779	// should I check here?
[562]	780	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0, mViewCellsManager->GetMaxPvsSize()))
[547]	781	{
	782	viewCell->SetValid(false);
	783	leaf->SetTreeValid(false);
	784	PropagateUpValidity(leaf);
[463]	785
[574]	786	++ mBspStats.invalidLeaves;
[547]	787	}
	788
[580]	789	viewCell->mLeaf = leaf;
[547]	790
	791	if (mUseAreaForPvs)
	792	viewCell->SetArea(tData.mProbability);
	793	else
	794	viewCell->SetVolume(tData.mProbability);
	795
	796	leaf->mProbability = tData.mProbability;
	797
[487]	798	EvaluateLeafStats(tData);
[463]	799	}
[482]	800
[473]	801	//-- cleanup
[478]	802	tData.Clear();
[463]	803
[472]	804	return newNode;
[463]	805	}
	806
[487]	807
[653]	808	BspNode *VspBspTree::Subdivide(VspBspSplitQueue &tQueue,
	809	VspBspSplitCandidate &splitCandidate)
	810	{
	811	VspBspTraversalData &tData = splitCandidate.mParentData;
	812
	813	BspNode *newNode = tData.mNode;
	814
[654]	815	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
[653]	816	{
	817	PolygonContainer coincident;
	818
	819	VspBspTraversalData tFrontData;
	820	VspBspTraversalData tBackData;
	821
	822	#if OCTREE_HACK
	823	//Debug << "new axis:" << (tData.mAxis + 1) % 3 << endl;
	824	tFrontData.mAxis = (tData.mAxis + 1) % 3;
	825	tBackData.mAxis = (tData.mAxis + 1) % 3;
	826	#endif
	827	//-- continue subdivision
	828	// create new interior node and two leaf node
	829	const Plane3 splitPlane = splitCandidate.mSplitPlane;
[654]	830
[653]	831	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
[654]	832
[653]	833	#if 0 // TODO
[654]	834	if (splitAxis < 3)
	835	++ mBspStats.splits[splitAxis];
	836	else
	837	++ mBspStats.polySplits;
[653]	838
[654]	839	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && splitAxis < 3);
	840	// how often was max cost ratio missed in this branch?
	841	tFrontData.mMaxCostMisses = maxCostMisses;
	842	tBackData.mMaxCostMisses = maxCostMisses;
	843
[653]	844	#endif
	845	if (1)
	846	{
	847	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	848	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	849	float cData = (float)tData.mPvs * tData.mProbability;;
	850
	851	float costDecr =
	852	(cFront + cBack - cData) / mBox.GetVolume();
	853
	854	mTotalCost += costDecr;
	855	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
	856
	857	mSubdivisionStats
	858	<< "#ViewCells\n" << mBspStats.Leaves() << endl
[654]	859	<< "#RenderCostDecrease\n" << -costDecr << endl
	860	<< "#dummy\n" << splitCandidate.GetCost() << endl
[653]	861	<< "#TotalRenderCost\n" << mTotalCost << endl
	862	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
	863	}
	864
	865	//-- push the new split candidates on the stack
	866	VspBspSplitCandidate frontCandidate;
	867	VspBspSplitCandidate backCandidate;
	868
[654]	869	EvalSplitCandidate(tFrontData, frontCandidate);
	870	EvalSplitCandidate(tBackData, backCandidate);
	871
[653]	872	tQueue.push(frontCandidate);
	873	tQueue.push(backCandidate);
	874
	875	// delete old leaf node
	876	DEL_PTR(tData.mNode);
	877	}
	878
[654]	879
[653]	880	//-- terminate traversal and create new view cell
	881	if (newNode->IsLeaf())
	882	{
	883	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
	884	BspViewCell *viewCell = new BspViewCell();
	885
	886	leaf->SetViewCell(viewCell);
	887
	888	//-- update pvs
	889	int conSamp = 0;
	890	float sampCon = 0.0f;
	891	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
	892
	893	mBspStats.contributingSamples += conSamp;
	894	mBspStats.sampleContributions +=(int) sampCon;
	895
	896	//-- store additional info
	897	if (mStoreRays)
	898	{
	899	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
	900	for (it = tData.mRays->begin(); it != it_end; ++ it)
	901	{
	902	(*it).mRay->Ref();
	903	leaf->mVssRays.push_back((*it).mRay);
	904	}
	905	}
	906
	907	// should I check here?
	908	viewCell->mLeaf = leaf;
	909
	910	if (mUseAreaForPvs)
	911	viewCell->SetArea(tData.mProbability);
	912	else
	913	viewCell->SetVolume(tData.mProbability);
	914
	915	leaf->mProbability = tData.mProbability;
	916
	917	EvaluateLeafStats(tData);
	918	}
	919
	920	//-- cleanup
	921	tData.Clear();
	922
	923	return newNode;
	924	}
	925
	926
[652]	927	void VspBspTree::EvalSplitCandidate(VspBspTraversalData &tData,
	928	VspBspSplitCandidate &splitData)
	929	{
	930	VspBspTraversalData frontData;
	931	VspBspTraversalData backData;
	932
	933	int splitAxis = 0;
	934
	935	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
[654]	936
	937	// compute locally best split plane
[652]	938	SelectPlane(splitData.mSplitPlane, leaf, tData, frontData, backData, splitAxis);
	939
	940	// TODO: reuse
	941	DEL_PTR(frontData.mGeometry);
	942	DEL_PTR(backData.mGeometry);
	943
[654]	944	// compute global decrease in render cost
[652]	945	splitData.mRenderCost = EvalRenderCostDecrease(splitData.mSplitPlane, tData);
	946	splitData.mParentData = tData;
	947	}
	948
	949
[653]	950	BspInterior *VspBspTree::SubdivideNode(const Plane3 &splitPlane,
	951	VspBspTraversalData &tData,
	952	VspBspTraversalData &frontData,
	953	VspBspTraversalData &backData,
	954	PolygonContainer &coincident)
[463]	955	{
	956	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
[508]	957
[473]	958	//-- the front and back traversal data is filled with the new values
	959	frontData.mDepth = tData.mDepth + 1;
[508]	960	frontData.mPolygons = new PolygonContainer();
[473]	961	frontData.mRays = new RayInfoContainer();
[508]	962
[473]	963	backData.mDepth = tData.mDepth + 1;
[508]	964	backData.mPolygons = new PolygonContainer();
[473]	965	backData.mRays = new RayInfoContainer();
[508]	966
[653]	967
	968	//-- subdivide rays
[652]	969	SplitRays(splitPlane,
[482]	970	*tData.mRays,
	971	*frontData.mRays,
[463]	972	*backData.mRays);
[482]	973
[463]	974
[472]	975	// compute pvs
[463]	976	frontData.mPvs = ComputePvsSize(*frontData.mRays);
	977	backData.mPvs = ComputePvsSize(*backData.mRays);
	978
[508]	979	// split front and back node geometry and compute area
[547]	980
	981	// if geometry was not already computed
[602]	982	if (!frontData.mGeometry && !backData.mGeometry)
[463]	983	{
[547]	984	frontData.mGeometry = new BspNodeGeometry();
	985	backData.mGeometry = new BspNodeGeometry();
[482]	986
[547]	987	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
	988	*backData.mGeometry,
[652]	989	splitPlane,
[547]	990	mBox,
	991	mEpsilon);
[508]	992
[547]	993	if (mUseAreaForPvs)
	994	{
	995	frontData.mProbability = frontData.mGeometry->GetArea();
	996	backData.mProbability = backData.mGeometry->GetArea();
[508]	997	}
[547]	998	else
	999	{
	1000	frontData.mProbability = frontData.mGeometry->GetVolume();
[654]	1001	backData.mProbability = tData.mProbability - frontData.mProbability;
[547]	1002	}
[463]	1003	}
[547]	1004
[652]	1005
	1006	// subdivide polygons
	1007	SplitPolygons(splitPlane,
	1008	*tData.mPolygons,
	1009	*frontData.mPolygons,
	1010	*backData.mPolygons,
	1011	coincident);
[463]	1012
[652]	1013
	1014
[653]	1015	///////////////////////////////////////
	1016	// subdivide further
[652]	1017
	1018	mBspStats.nodes += 2;
	1019
	1020
	1021	BspInterior *interior = new BspInterior(splitPlane);
	1022
	1023	#ifdef _DEBUG
	1024	Debug << interior << endl;
	1025	#endif
	1026
[463]	1027	//-- create front and back leaf
	1028
	1029	BspInterior *parent = leaf->GetParent();
	1030
	1031	// replace a link from node's parent
[487]	1032	if (parent)
[463]	1033	{
	1034	parent->ReplaceChildLink(leaf, interior);
	1035	interior->SetParent(parent);
	1036	}
	1037	else // new root
	1038	{
	1039	mRoot = interior;
	1040	}
	1041
	1042	// and setup child links
	1043	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
[482]	1044
[463]	1045	frontData.mNode = interior->GetFront();
	1046	backData.mNode = interior->GetBack();
[473]	1047
[650]	1048	interior->mTimeStamp = mTimeStamp ++;
[652]	1049
[463]	1050	//DEL_PTR(leaf);
	1051	return interior;
	1052	}
	1053
[508]	1054
[463]	1055	void VspBspTree::AddToPvs(BspLeaf *leaf,
[482]	1056	const RayInfoContainer &rays,
[556]	1057	float &sampleContributions,
[463]	1058	int &contributingSamples)
	1059	{
[556]	1060	sampleContributions = 0;
	1061	contributingSamples = 0;
	1062
	1063	RayInfoContainer::const_iterator it, it_end = rays.end();
	1064
	1065	ViewCell *vc = leaf->GetViewCell();
	1066
	1067	// add contributions from samples to the PVS
	1068	for (it = rays.begin(); it != it_end; ++ it)
[463]	1069	{
[556]	1070	float sc = 0.0f;
	1071	VssRay ray = (it).mRay;
	1072	bool madeContrib = false;
	1073	float contribution;
	1074	if (ray->mTerminationObject) {
	1075	if (vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf, contribution))
	1076	madeContrib = true;
	1077	sc += contribution;
	1078	}
	1079
	1080	if (ray->mOriginObject) {
	1081	if (vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf, contribution))
	1082	madeContrib = true;
	1083	sc += contribution;
	1084	}
	1085
	1086	sampleContributions += sc;
	1087	if (madeContrib)
	1088	++ contributingSamples;
	1089
	1090	//leaf->mVssRays.push_back(ray);
[463]	1091	}
	1092	}
	1093
[580]	1094
[480]	1095	void VspBspTree::SortSplitCandidates(const RayInfoContainer &rays, const int axis)
[463]	1096	{
[480]	1097	mSplitCandidates->clear();
[463]	1098
[480]	1099	int requestedSize = 2 * (int)(rays.size());
	1100	// creates a sorted split candidates array
	1101	if (mSplitCandidates->capacity() > 500000 &&
[612]	1102	requestedSize < (int)(mSplitCandidates->capacity() / 10) )
[480]	1103	{
[482]	1104	delete mSplitCandidates;
[480]	1105	mSplitCandidates = new vector<SortableEntry>;
	1106	}
[463]	1107
[480]	1108	mSplitCandidates->reserve(requestedSize);
	1109
	1110	// insert all queries
[612]	1111	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
[473]	1112	{
[612]	1113	const bool positive = (*ri).mRay->HasPosDir(axis);
[480]	1114	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
[482]	1115	(ri).ExtrapOrigin(axis), (ri).mRay));
[480]	1116
	1117	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
[482]	1118	(ri).ExtrapTermination(axis), (ri).mRay));
[473]	1119	}
[480]	1120
	1121	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
[463]	1122	}
	1123
[580]	1124
[480]	1125	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
	1126	const AxisAlignedBox3 &box,
	1127	const int pvsSize,
[481]	1128	const int &axis,
[480]	1129	float &position)
[463]	1130	{
[480]	1131	SortSplitCandidates(rays, axis);
	1132
[463]	1133	// go through the lists, count the number of objects left and right
	1134	// and evaluate the following cost funcion:
[480]	1135	// C = ct_div_ci + (qlrl + qrrr)/queries
	1136
[612]	1137	int pvsl = 0, pvsr = pvsSize;
[480]	1138
[612]	1139	int pvsBack = pvsl;
	1140	int pvsFront = pvsr;
	1141
[463]	1142	float minBox = box.Min(axis);
	1143	float maxBox = box.Max(axis);
[480]	1144	float sizeBox = maxBox - minBox;
	1145
[612]	1146	float minBand = minBox + 0.1f * (maxBox - minBox);
	1147	float maxBand = minBox + 0.9f * (maxBox - minBox);
[480]	1148
[612]	1149	float sum = (float)pvsSize * sizeBox;
[463]	1150	float minSum = 1e20f;
	1151
[480]	1152	Intersectable::NewMail();
	1153
[612]	1154	RayInfoContainer::const_iterator ri, ri_end = rays.end();
	1155
	1156	// set all object as belonging to the front pvs
	1157	for(ri = rays.begin(); ri != ri_end; ++ ri)
[463]	1158	{
[612]	1159	Intersectable oObject = (ri).mRay->mOriginObject;
	1160	Intersectable tObject = (ri).mRay->mTerminationObject;
	1161
	1162	if (oObject)
[463]	1163	{
[612]	1164	if (!oObject->Mailed())
[482]	1165	{
[612]	1166	oObject->Mail();
	1167	oObject->mCounter = 1;
[482]	1168	}
[612]	1169	else
	1170	{
	1171	++ oObject->mCounter;
	1172	}
[463]	1173	}
[612]	1174	if (tObject)
	1175	{
	1176	if (!tObject->Mailed())
	1177	{
	1178	tObject->Mail();
	1179	tObject->mCounter = 1;
	1180	}
	1181	else
	1182	{
	1183	++ tObject->mCounter;
	1184	}
	1185	}
[480]	1186	}
	1187
	1188	Intersectable::NewMail();
	1189
[612]	1190	vector<SortableEntry>::const_iterator ci, ci_end = mSplitCandidates->end();
	1191
	1192	for (ci = mSplitCandidates->begin(); ci < ci_end; ++ ci)
[480]	1193	{
	1194	VssRay *ray;
[612]	1195	ray = (*ci).ray;
	1196
	1197	Intersectable *oObject = ray->mOriginObject;
	1198	Intersectable *tObject = ray->mTerminationObject;
	1199
[480]	1200
	1201	switch ((*ci).type)
[463]	1202	{
[480]	1203	case SortableEntry::ERayMin:
	1204	{
[612]	1205	if (oObject && !oObject->Mailed())
[480]	1206	{
[612]	1207	oObject->Mail();
	1208	++ pvsl;
[480]	1209	}
[612]	1210	if (tObject && !tObject->Mailed())
	1211	{
	1212	tObject->Mail();
	1213	++ pvsl;
	1214	}
[480]	1215	break;
	1216	}
	1217	case SortableEntry::ERayMax:
	1218	{
[612]	1219	if (oObject)
	1220	{
	1221	if (-- oObject->mCounter == 0)
	1222	-- pvsr;
	1223	}
[463]	1224
[612]	1225	if (tObject)
[480]	1226	{
[612]	1227	if (-- tObject->mCounter == 0)
	1228	-- pvsr;
[480]	1229	}
	1230
	1231	break;
	1232	}
	1233	}
	1234
	1235	// Note: sufficient to compare size of bounding boxes of front and back side?
	1236	if ((ci).value > minBand && (ci).value < maxBand)
	1237	{
[612]	1238	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
[480]	1239
	1240	// cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
	1241	// cout<<"cost= "<<sum<<endl;
	1242
	1243	if (sum < minSum)
[463]	1244	{
	1245	minSum = sum;
	1246	position = (*ci).value;
	1247
[612]	1248	pvsBack = pvsl;
	1249	pvsFront = pvsr;
[463]	1250	}
	1251	}
	1252	}
	1253
[612]	1254	// -- compute cost
[463]	1255
[612]	1256	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
	1257	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
	1258
	1259	const float pOverall = sizeBox;
	1260
	1261	const float pBack = position - minBox;
	1262	const float pFront = maxBox - position;
	1263
	1264	const float penaltyOld = EvalPvsPenalty(pvsSize, lowerPvsLimit, upperPvsLimit);
	1265	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	1266	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
	1267
	1268	const float oldRenderCost = penaltyOld * pOverall;
	1269	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
	1270
	1271	float ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
	1272
[480]	1273	//Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
	1274	// <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
	1275
	1276	return ratio;
[463]	1277	}
	1278
[480]	1279
[482]	1280	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
[491]	1281	const VspBspTraversalData &tData,
[495]	1282	int &axis,
[508]	1283	BspNodeGeometry **frontGeom,
	1284	BspNodeGeometry **backGeom,
[547]	1285	float &pFront,
	1286	float &pBack,
	1287	const bool useKdSplit)
[463]	1288	{
[508]	1289	float nPosition[3];
	1290	float nCostRatio[3];
[547]	1291	float nProbFront[3];
	1292	float nProbBack[3];
[508]	1293
	1294	BspNodeGeometry *nFrontGeom[3];
	1295	BspNodeGeometry *nBackGeom[3];
	1296
[612]	1297	for (int i = 0; i < 3; ++ i)
	1298	{
	1299	nFrontGeom[i] = NULL;
	1300	nBackGeom[i] = NULL;
	1301	}
	1302
[508]	1303	int bestAxis = -1;
	1304
[545]	1305	// create bounding box of node geometry
[463]	1306	AxisAlignedBox3 box;
	1307	box.Initialize();
[547]	1308
[562]	1309	//TODO: for kd split geometry already is box => only take minmax vertices
[551]	1310	if (1)
[509]	1311	{
	1312	PolygonContainer::const_iterator it, it_end = tData.mGeometry->mPolys.end();
[480]	1313
[509]	1314	for(it = tData.mGeometry->mPolys.begin(); it < it_end; ++ it)
	1315	box.Include((it));
	1316	}
	1317	else
	1318	{
	1319	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
[480]	1320
[509]	1321	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
	1322	box.Include((*ri).ExtrapTermination());
	1323	}
[611]	1324	#if OCTREE_HACK
	1325	//Debug << "choosing axis:" << tData.mAxis << endl;
	1326	const int sAxis = tData.mAxis;
	1327	#else
[605]	1328	const int sAxis = mUseRandomAxis ? Random(3) : box.Size().DrivingAxis();
[611]	1329	#endif
[495]	1330	for (axis = 0; axis < 3; ++ axis)
[480]	1331	{
[545]	1332	if (!mOnlyDrivingAxis \|\| (axis == sAxis))
[463]	1333	{
[612]	1334	if (!mUseCostHeuristics)
[480]	1335	{
[612]	1336	nFrontGeom[axis] = new BspNodeGeometry();
	1337	nBackGeom[axis] = new BspNodeGeometry();
	1338
[480]	1339	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
[543]	1340	Vector3 normal(0,0,0); normal[axis] = 1.0f;
[547]	1341
	1342	// allows faster split because we have axis aligned kd tree boxes
[542]	1343	if (useKdSplit)
	1344	{
	1345	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
	1346	box,
	1347	axis,
[547]	1348	nPosition[axis],
	1349	nProbFront[axis],
	1350	nProbBack[axis]);
[542]	1351
[543]	1352	Vector3 pos;
[542]	1353
[543]	1354	pos = box.Max(); pos[axis] = nPosition[axis];
[547]	1355	AxisAlignedBox3 bBox(box.Min(), pos);
	1356	bBox.ExtractPolys(nBackGeom[axis]->mPolys);
[543]	1357
[542]	1358	pos = box.Min(); pos[axis] = nPosition[axis];
[547]	1359	AxisAlignedBox3 fBox(pos, box.Max());
	1360	fBox.ExtractPolys(nFrontGeom[axis]->mPolys);
[542]	1361	}
	1362	else
	1363	{
[573]	1364	nCostRatio[axis] =
	1365	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
	1366	tData, nFrontGeom[axis], nBackGeom[axis],
	1367	nProbFront[axis], nProbBack[axis]);
[542]	1368	}
[480]	1369	}
[481]	1370	else
	1371	{
[482]	1372	nCostRatio[axis] =
[481]	1373	BestCostRatioHeuristics(*tData.mRays,
	1374	box,
	1375	tData.mPvs,
	1376	axis,
	1377	nPosition[axis]);
	1378	}
	1379
[480]	1380	if (bestAxis == -1)
	1381	{
	1382	bestAxis = axis;
	1383	}
	1384	else if (nCostRatio[axis] < nCostRatio[bestAxis])
	1385	{
	1386	bestAxis = axis;
	1387	}
	1388
[463]	1389	}
	1390	}
	1391
[495]	1392	//-- assign values
	1393	axis = bestAxis;
[547]	1394	pFront = nProbFront[bestAxis];
	1395	pBack = nProbBack[bestAxis];
[495]	1396
[508]	1397	// assign best split nodes geometry
	1398	*frontGeom = nFrontGeom[bestAxis];
	1399	*backGeom = nBackGeom[bestAxis];
[542]	1400
[508]	1401	// and delete other geometry
[612]	1402	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
	1403	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
[495]	1404
[508]	1405	//-- split plane
	1406	Vector3 normal(0,0,0); normal[bestAxis] = 1;
[480]	1407	plane = Plane3(normal, nPosition[bestAxis]);
[508]	1408
[480]	1409	return nCostRatio[bestAxis];
[463]	1410	}
	1411
[480]	1412
[508]	1413	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
	1414	BspLeaf *leaf,
[652]	1415	VspBspTraversalData &data,
[508]	1416	VspBspTraversalData &frontData,
[612]	1417	VspBspTraversalData &backData,
	1418	int &splitAxis)
[491]	1419	{
[508]	1420	// simplest strategy: just take next polygon
	1421	if (mSplitPlaneStrategy & RANDOM_POLYGON)
[491]	1422	{
[508]	1423	if (!data.mPolygons->empty())
	1424	{
	1425	const int randIdx =
	1426	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
	1427	Polygon3 nextPoly = (data.mPolygons)[randIdx];
[491]	1428
[508]	1429	bestPlane = nextPoly->GetSupportingPlane();
	1430	return true;
	1431	}
[491]	1432	}
	1433
[508]	1434	//-- use heuristics to find appropriate plane
[491]	1435
[508]	1436	// intermediate plane
	1437	Plane3 plane;
	1438	float lowestCost = MAX_FLOAT;
[517]	1439
	1440	// decides if the first few splits should be only axisAligned
[508]	1441	const bool onlyAxisAligned =
	1442	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
	1443	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
	1444	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
	1445
	1446	const int limit = onlyAxisAligned ? 0 :
	1447	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
[491]	1448
[508]	1449	float candidateCost;
[491]	1450
[508]	1451	int maxIdx = (int)data.mPolygons->size();
[491]	1452
[508]	1453	for (int i = 0; i < limit; ++ i)
[491]	1454	{
[562]	1455	// the already taken candidates are stored behind maxIdx
	1456	// => assure that no index is taken twice
[508]	1457	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
	1458	Polygon3 poly = (data.mPolygons)[candidateIdx];
[491]	1459
[508]	1460	// swap candidate to the end to avoid testing same plane
	1461	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
	1462	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
[491]	1463
[508]	1464	// evaluate current candidate
	1465	BspNodeGeometry fGeom, bGeom;
	1466	float fArea, bArea;
	1467	plane = poly->GetSupportingPlane();
[573]	1468	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
[491]	1469
[508]	1470	if (candidateCost < lowestCost)
[491]	1471	{
[508]	1472	bestPlane = plane;
	1473	lowestCost = candidateCost;
[491]	1474	}
	1475	}
	1476
[508]	1477	//-- evaluate axis aligned splits
	1478	int axis;
	1479	BspNodeGeometry fGeom, bGeom;
[547]	1480	float pFront, pBack;
[491]	1481
[653]	1482	candidateCost = 99999999.0f;
[491]	1483
[653]	1484	// option: axis aligned split only if no polygon available
	1485	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
	1486	{
	1487	candidateCost = SelectAxisAlignedPlane(plane,
	1488	data,
	1489	axis,
	1490	&fGeom,
	1491	&bGeom,
	1492	pFront,
	1493	pBack,
	1494	data.mIsKdNode);
	1495	}
	1496
[612]	1497	splitAxis = 3;
[562]	1498
[508]	1499	if (candidateCost < lowestCost)
	1500	{
	1501	bestPlane = plane;
	1502	lowestCost = candidateCost;
[612]	1503	splitAxis = axis;
[653]	1504
[542]	1505	// assign already computed values
	1506	// we can do this because we always save the
[562]	1507	// computed values from the axis aligned splits
[653]	1508
[612]	1509	if (fGeom && bGeom)
	1510	{
	1511	frontData.mGeometry = fGeom;
	1512	backData.mGeometry = bGeom;
[547]	1513
[612]	1514	frontData.mProbability = pFront;
	1515	backData.mProbability = pBack;
	1516	}
[508]	1517	}
	1518	else
[463]	1519	{
[508]	1520	DEL_PTR(fGeom);
	1521	DEL_PTR(bGeom);
[463]	1522	}
[653]	1523
[463]	1524
[508]	1525	#ifdef _DEBUG
	1526	Debug << "plane lowest cost: " << lowestCost << endl;
	1527	#endif
	1528
	1529	if (lowestCost > mTermMaxCostRatio)
[611]	1530	{
[508]	1531	return false;
[611]	1532	}
[508]	1533
	1534	return true;
[463]	1535	}
	1536
[480]	1537
[473]	1538	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
[482]	1539	{
[473]	1540	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
[482]	1541
[473]	1542	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
	1543	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
	1544
	1545	const Vector3 pt = (maxPt + minPt) * 0.5;
	1546	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
	1547
	1548	return Plane3(normal, pt);
	1549	}
	1550
[480]	1551
[473]	1552	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
[482]	1553	{
[473]	1554	Vector3 pt[3];
[482]	1555
[473]	1556	int idx[3];
	1557	int cmaxT = 0;
	1558	int cminT = 0;
	1559	bool chooseMin = false;
	1560
	1561	for (int j = 0; j < 3; ++ j)
	1562	{
	1563	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
[482]	1564
[473]	1565	if (idx[j] >= (int)rays.size())
	1566	{
	1567	idx[j] -= (int)rays.size();
[482]	1568
[473]	1569	chooseMin = (cminT < 2);
	1570	}
	1571	else
	1572	chooseMin = (cmaxT < 2);
	1573
	1574	RayInfo rayInf = rays[idx[j]];
	1575	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
[482]	1576	}
[473]	1577
	1578	return Plane3(pt[0], pt[1], pt[2]);
	1579	}
	1580
[580]	1581
[473]	1582	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
[482]	1583	{
[473]	1584	Vector3 pt[3];
[482]	1585
[473]	1586	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1587	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1588
	1589	// check if rays different
	1590	if (idx1 == idx2)
	1591	idx2 = (idx2 + 1) % (int)rays.size();
	1592
	1593	const RayInfo ray1 = rays[idx1];
	1594	const RayInfo ray2 = rays[idx2];
	1595
	1596	// normal vector of the plane parallel to both lines
	1597	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
	1598
	1599	// vector from line 1 to line 2
[479]	1600	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
[482]	1601
[473]	1602	// project vector on normal to get distance
	1603	const float dist = DotProd(vd, norm);
	1604
	1605	// point on plane lies halfway between the two planes
	1606	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
	1607
	1608	return Plane3(norm, planePt);
	1609	}
	1610
[495]	1611
[463]	1612	inline void VspBspTree::GenerateUniqueIdsForPvs()
	1613	{
[580]	1614	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
	1615	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
	1616	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
[463]	1617	}
	1618
[495]	1619
[652]	1620	float VspBspTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
	1621	const VspBspTraversalData &data) const
	1622	{
	1623	int pvsFront = 0;
	1624	int pvsBack = 0;
[654]	1625	int totalPvs = 0;
[652]	1626
	1627	// probability that view point lies in back / front node
	1628	float pOverall = data.mProbability;
	1629	float pFront = 0;
	1630	float pBack = 0;
	1631
	1632
	1633	// create unique ids for pvs heuristics
	1634	GenerateUniqueIdsForPvs();
	1635
	1636	for (int i = 0; i < data.mRays->size(); ++ i)
	1637	{
	1638	RayInfo rayInf = (*data.mRays)[i];
	1639
	1640	float t;
	1641	VssRay *ray = rayInf.mRay;
	1642	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
	1643
	1644	// find front and back pvs for origing and termination object
	1645	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
	1646	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
	1647	}
	1648
	1649
	1650	BspNodeGeometry geomFront;
	1651	BspNodeGeometry geomBack;
	1652
	1653	// construct child geometry with regard to the candidate split plane
	1654	data.mGeometry->SplitGeometry(geomFront,
	1655	geomBack,
	1656	candidatePlane,
	1657	mBox,
	1658	mEpsilon);
	1659
	1660	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
	1661	{
	1662	pFront = geomFront.GetVolume();
	1663	pBack = pOverall - pFront;
	1664	}
	1665	else
	1666	{
	1667	pFront = geomFront.GetArea();
	1668	pBack = geomBack.GetArea();
	1669	}
	1670
	1671
	1672	// -- pvs rendering heuristics
	1673	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
	1674	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
	1675
	1676	// only render cost heuristics or combined with standard deviation
	1677	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
	1678	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	1679	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
	1680
	1681	const float oldRenderCost = pOverall * penaltyOld;
	1682	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
	1683
[654]	1684	//Debug << "decrease: " << oldRenderCost - newRenderCost << endl;
	1685	return (oldRenderCost - newRenderCost) / mBox.GetVolume();
[652]	1686	}
	1687
	1688
[573]	1689	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
	1690	const VspBspTraversalData &data,
	1691	BspNodeGeometry &geomFront,
	1692	BspNodeGeometry &geomBack,
	1693	float &pFront,
	1694	float &pBack) const
[463]	1695	{
[472]	1696	float cost = 0;
[463]	1697
[652]	1698	int totalPvs = 0;
[508]	1699	int pvsFront = 0;
	1700	int pvsBack = 0;
[652]	1701
[508]	1702	// probability that view point lies in back / front node
[463]	1703	float pOverall = 0;
[547]	1704	pFront = 0;
	1705	pBack = 0;
[463]	1706
[508]	1707
[463]	1708	int limit;
	1709	bool useRand;
	1710
[652]	1711	// create unique ids for pvs heuristics
	1712	GenerateUniqueIdsForPvs();
	1713
[491]	1714	// choose test rays randomly if too much
[463]	1715	if ((int)data.mRays->size() > mMaxTests)
	1716	{
	1717	useRand = true;
	1718	limit = mMaxTests;
	1719	}
	1720	else
	1721	{
	1722	useRand = false;
	1723	limit = (int)data.mRays->size();
	1724	}
[508]	1725
[463]	1726	for (int i = 0; i < limit; ++ i)
	1727	{
[508]	1728	const int testIdx = useRand ?
	1729	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
[463]	1730	RayInfo rayInf = (*data.mRays)[testIdx];
	1731
	1732	float t;
[508]	1733	VssRay *ray = rayInf.mRay;
[463]	1734	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
	1735
[652]	1736	// find front and back pvs for origing and termination object
	1737	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
	1738	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
	1739	}
[508]	1740
[652]	1741	// construct child geometry with regard to the candidate split plane
	1742	data.mGeometry->SplitGeometry(geomFront,
	1743	geomBack,
	1744	candidatePlane,
	1745	mBox,
	1746	mEpsilon);
[482]	1747
[652]	1748	pOverall = data.mProbability;
[463]	1749
[652]	1750	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
	1751	{
	1752	pFront = geomFront.GetVolume();
	1753	pBack = pOverall - pFront;
[463]	1754	}
[652]	1755	else
[542]	1756	{
[652]	1757	pFront = geomFront.GetArea();
	1758	pBack = geomBack.GetArea();
[542]	1759	}
[652]	1760
[542]	1761
[580]	1762	// -- pvs rendering heuristics
[652]	1763	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
	1764	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
[580]	1765
[652]	1766	// only render cost heuristics or combined with standard deviation
	1767	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
	1768	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
	1769	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
[579]	1770
[652]	1771	const float oldRenderCost = pOverall * penaltyOld;
	1772	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
[579]	1773
[652]	1774	float oldCost, newCost;
[580]	1775
[652]	1776	// only render cost
	1777	if (1)
	1778	{
	1779	oldCost = oldRenderCost;
	1780	newCost = newRenderCost;
	1781	}
	1782	else // also considering standard deviation
	1783	{
	1784	// standard deviation is difference of back and front pvs
	1785	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
[580]	1786
[652]	1787	const float newDeviation = 0.5f *
	1788	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
[580]	1789
[652]	1790	const float oldDeviation = penaltyOld;
[580]	1791
[652]	1792	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
	1793	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
	1794	}
[580]	1795
[652]	1796	cost += mPvsFactor * newCost / (oldCost + Limits::Small);
[607]	1797
[463]	1798
	1799	#ifdef _DEBUG
[474]	1800	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
[508]	1801	<< " frontpvs: " << pvsFront << " pFront: " << pFront
	1802	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
[600]	1803	Debug << "cost: " << cost << endl;
[463]	1804	#endif
[482]	1805
[652]	1806	return cost;
[463]	1807	}
	1808
[508]	1809
[580]	1810	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
	1811	const AxisAlignedBox3 &box,
	1812	const int axis,
	1813	const float &position,
	1814	float &pFront,
	1815	float &pBack) const
	1816	{
	1817	int pvsTotal = 0;
	1818	int pvsFront = 0;
	1819	int pvsBack = 0;
	1820
	1821	// create unique ids for pvs heuristics
	1822	GenerateUniqueIdsForPvs();
	1823
	1824	const int pvsSize = data.mPvs;
	1825
	1826	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
	1827
	1828	// this is the main ray classification loop!
	1829	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
	1830	{
	1831	//if (!(*rit).mRay->IsActive()) continue;
	1832
	1833	// determine the side of this ray with respect to the plane
	1834	float t;
	1835	const int side = (*rit).ComputeRayIntersection(axis, position, t);
	1836
	1837	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
	1838	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
	1839	}
	1840
	1841	//-- pvs heuristics
	1842	float pOverall;
	1843
	1844	//-- compute heurstics
	1845	// we take simplified computation for mid split
	1846
	1847	pOverall = data.mProbability;
	1848
	1849	if (!mUseAreaForPvs)
	1850	{ // volume
	1851	pBack = pFront = pOverall * 0.5f;
	1852
	1853	#if 0
	1854	// box length substitute for probability
	1855	const float minBox = box.Min(axis);
	1856	const float maxBox = box.Max(axis);
	1857
	1858	pBack = position - minBox;
	1859	pFront = maxBox - position;
	1860	pOverall = maxBox - minBox;
	1861	#endif
	1862	}
	1863	else //-- area substitute for probability
	1864	{
	1865	const int axis2 = (axis + 1) % 3;
	1866	const int axis3 = (axis + 2) % 3;
	1867
	1868	const float faceArea =
	1869	(box.Max(axis2) - box.Min(axis2)) *
	1870	(box.Max(axis3) - box.Min(axis3));
	1871
	1872	pBack = pFront = pOverall * 0.5f + faceArea;
	1873	}
	1874
	1875	#ifdef _DEBUG
	1876	Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
	1877	Debug << pFront << " " << pBack << " " << pOverall << endl;
	1878	#endif
	1879
	1880
	1881	const float newCost = pvsBack * pBack + pvsFront * pFront;
	1882	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
	1883
	1884	return (mCtDivCi + newCost) / oldCost;
	1885	}
	1886
	1887
[463]	1888	void VspBspTree::AddObjToPvs(Intersectable *obj,
	1889	const int cf,
	1890	int &frontPvs,
[508]	1891	int &backPvs,
	1892	int &totalPvs) const
[463]	1893	{
	1894	if (!obj)
	1895	return;
[654]	1896	// new object
[508]	1897	if ((obj->mMailbox != sFrontId) &&
	1898	(obj->mMailbox != sBackId) &&
	1899	(obj->mMailbox != sFrontAndBackId))
	1900	{
	1901	++ totalPvs;
	1902	}
	1903
[463]	1904	// TODO: does this really belong to no pvs?
	1905	//if (cf == Ray::COINCIDENT) return;
	1906
	1907	// object belongs to both PVS
	1908	if (cf >= 0)
	1909	{
[482]	1910	if ((obj->mMailbox != sFrontId) &&
[463]	1911	(obj->mMailbox != sFrontAndBackId))
	1912	{
	1913	++ frontPvs;
[508]	1914
[463]	1915	if (obj->mMailbox == sBackId)
[482]	1916	obj->mMailbox = sFrontAndBackId;
[463]	1917	else
[482]	1918	obj->mMailbox = sFrontId;
[463]	1919	}
	1920	}
[482]	1921
[463]	1922	if (cf <= 0)
	1923	{
	1924	if ((obj->mMailbox != sBackId) &&
	1925	(obj->mMailbox != sFrontAndBackId))
	1926	{
	1927	++ backPvs;
[508]	1928
[463]	1929	if (obj->mMailbox == sFrontId)
[482]	1930	obj->mMailbox = sFrontAndBackId;
[463]	1931	else
[482]	1932	obj->mMailbox = sBackId;
[463]	1933	}
	1934	}
	1935	}
	1936
[491]	1937
[503]	1938	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
	1939	const bool onlyUnmailed,
	1940	const int maxPvsSize) const
[463]	1941	{
	1942	stack<BspNode *> nodeStack;
	1943	nodeStack.push(mRoot);
[482]	1944
	1945	while (!nodeStack.empty())
[463]	1946	{
	1947	BspNode *node = nodeStack.top();
	1948	nodeStack.pop();
[489]	1949
[482]	1950	if (node->IsLeaf())
[463]	1951	{
[490]	1952	// test if this leaf is in valid view space
[503]	1953	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	1954	if (leaf->TreeValid() &&
[508]	1955	(!onlyUnmailed \|\| !leaf->Mailed()) &&
[503]	1956	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().GetSize() <= maxPvsSize)))
[490]	1957	{
	1958	leaves.push_back(leaf);
	1959	}
[482]	1960	}
	1961	else
[463]	1962	{
	1963	BspInterior interior = dynamic_cast<BspInterior >(node);
	1964
	1965	nodeStack.push(interior->GetBack());
	1966	nodeStack.push(interior->GetFront());
	1967	}
	1968	}
	1969	}
	1970
[489]	1971
[463]	1972	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
	1973	{
	1974	return mBox;
	1975	}
	1976
[489]	1977
[463]	1978	BspNode *VspBspTree::GetRoot() const
	1979	{
	1980	return mRoot;
	1981	}
	1982
[489]	1983
[463]	1984	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
	1985	{
	1986	// the node became a leaf -> evaluate stats for leafs
	1987	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
	1988
	1989	// store maximal and minimal depth
[574]	1990	if (data.mDepth > mBspStats.maxDepth)
	1991	mBspStats.maxDepth = data.mDepth;
[463]	1992
[574]	1993	if (data.mPvs > mBspStats.maxPvs)
	1994	mBspStats.maxPvs = data.mPvs;
[508]	1995
[656]	1996	mBspStats.pvs += data.mPvs;
	1997
[574]	1998	if (data.mDepth < mBspStats.minDepth)
	1999	mBspStats.minDepth = data.mDepth;
[656]	2000
[463]	2001	if (data.mDepth >= mTermMaxDepth)
[574]	2002	++ mBspStats.maxDepthNodes;
[611]	2003
[508]	2004	// accumulate rays to compute rays / leaf
[574]	2005	mBspStats.accumRays += (int)data.mRays->size();
[463]	2006
[437]	2007	if (data.mPvs < mTermMinPvs)
[574]	2008	++ mBspStats.minPvsNodes;
[437]	2009
	2010	if ((int)data.mRays->size() < mTermMinRays)
[574]	2011	++ mBspStats.minRaysNodes;
[437]	2012
	2013	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
[574]	2014	++ mBspStats.maxRayContribNodes;
[482]	2015
[547]	2016	if (data.mProbability <= mTermMinProbability)
[574]	2017	++ mBspStats.minProbabilityNodes;
[508]	2018
[474]	2019	// accumulate depth to compute average depth
[574]	2020	mBspStats.accumDepth += data.mDepth;
[463]	2021
[612]	2022	++ mCreatedViewCells;
[656]	2023
[463]	2024	#ifdef _DEBUG
	2025	Debug << "BSP stats: "
	2026	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
	2027	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
[587]	2028	// << "Area: " << data.mProbability << " (min: " << mTermMinProbability << "), "
[482]	2029	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
[463]	2030	<< "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
	2031	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
	2032	#endif
	2033	}
	2034
[612]	2035
[463]	2036	int VspBspTree::CastRay(Ray &ray)
	2037	{
	2038	int hits = 0;
[482]	2039
[600]	2040	stack<BspRayTraversalData> tQueue;
[482]	2041
[463]	2042	float maxt, mint;
	2043
	2044	if (!mBox.GetRaySegment(ray, mint, maxt))
	2045	return 0;
	2046
	2047	Intersectable::NewMail();
[600]	2048	ViewCell::NewMail();
[463]	2049	Vector3 entp = ray.Extrap(mint);
	2050	Vector3 extp = ray.Extrap(maxt);
[482]	2051
[463]	2052	BspNode *node = mRoot;
	2053	BspNode *farChild = NULL;
[482]	2054
[463]	2055	while (1)
	2056	{
[482]	2057	if (!node->IsLeaf())
[463]	2058	{
	2059	BspInterior in = dynamic_cast<BspInterior >(node);
	2060
	2061	Plane3 splitPlane = in->GetPlane();
	2062	const int entSide = splitPlane.Side(entp);
	2063	const int extSide = splitPlane.Side(extp);
	2064
	2065	if (entSide < 0)
	2066	{
	2067	node = in->GetBack();
	2068
	2069	if(extSide <= 0) // plane does not split ray => no far child
	2070	continue;
[482]	2071
[463]	2072	farChild = in->GetFront(); // plane splits ray
	2073
	2074	} else if (entSide > 0)
	2075	{
	2076	node = in->GetFront();
	2077
	2078	if (extSide >= 0) // plane does not split ray => no far child
	2079	continue;
	2080
[482]	2081	farChild = in->GetBack(); // plane splits ray
[463]	2082	}
	2083	else // ray and plane are coincident
	2084	{
	2085	// WHAT TO DO IN THIS CASE ?
	2086	//break;
	2087	node = in->GetFront();
	2088	continue;
	2089	}
	2090
	2091	// push data for far child
[600]	2092	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
[463]	2093
	2094	// find intersection of ray segment with plane
	2095	float t;
	2096	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
	2097	maxt *= t;
[482]	2098
[463]	2099	} else // reached leaf => intersection with view cell
	2100	{
	2101	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
[482]	2102
[463]	2103	if (!leaf->GetViewCell()->Mailed())
	2104	{
	2105	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
	2106	leaf->GetViewCell()->Mail();
	2107	++ hits;
	2108	}
[482]	2109
[463]	2110	//-- fetch the next far child from the stack
[600]	2111	if (tQueue.empty())
[463]	2112	break;
[482]	2113
[463]	2114	entp = extp;
	2115	mint = maxt; // NOTE: need this?
	2116
	2117	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
	2118	break;
	2119
[600]	2120	BspRayTraversalData &s = tQueue.top();
[463]	2121
	2122	node = s.mNode;
	2123	extp = s.mExitPoint;
	2124	maxt = s.mMaxT;
	2125
[600]	2126	tQueue.pop();
[463]	2127	}
	2128	}
	2129
	2130	return hits;
	2131	}
	2132
[532]	2133
[547]	2134	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const
[463]	2135	{
[532]	2136	ViewCell::NewMail();
[551]	2137
	2138	CollectViewCells(mRoot, onlyValid, viewCells, true);
[532]	2139	}
	2140
	2141
[574]	2142	void VspBspTree::CollapseViewCells()
[542]	2143	{
[590]	2144	// TODO
	2145	#if VC_HISTORY
[542]	2146	stack<BspNode *> nodeStack;
	2147
	2148	if (!mRoot)
	2149	return;
	2150
	2151	nodeStack.push(mRoot);
	2152
	2153	while (!nodeStack.empty())
	2154	{
	2155	BspNode *node = nodeStack.top();
	2156	nodeStack.pop();
	2157
	2158	if (node->IsLeaf())
[574]	2159	{
	2160	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
[542]	2161
[574]	2162	if (!viewCell->GetValid())
[542]	2163	{
	2164	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
[580]	2165
	2166	ViewCellContainer leaves;
[590]	2167	mViewCellsTree->CollectLeaves(viewCell, leaves);
[580]	2168
	2169	ViewCellContainer::const_iterator it, it_end = leaves.end();
	2170
	2171	for (it = leaves.begin(); it != it_end; ++ it)
[542]	2172	{
[580]	2173	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
[574]	2174	l->SetViewCell(GetOrCreateOutOfBoundsCell());
	2175	++ mBspStats.invalidLeaves;
	2176	}
[542]	2177
[574]	2178	// add to unbounded view cell
	2179	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
	2180	DEL_PTR(viewCell);
	2181	}
	2182	}
	2183	else
	2184	{
	2185	BspInterior interior = dynamic_cast<BspInterior >(node);
	2186
	2187	nodeStack.push(interior->GetFront());
	2188	nodeStack.push(interior->GetBack());
	2189	}
	2190	}
[542]	2191
[574]	2192	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
[590]	2193	#endif
[574]	2194	}
	2195
	2196
[639]	2197	void VspBspTree::CollectRays(VssRayContainer &rays)
	2198	{
	2199	vector<BspLeaf *> leaves;
	2200
	2201	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
	2202
	2203	for (lit = leaves.begin(); lit != lit_end; ++ lit)
	2204	{
	2205	BspLeaf leaf = lit;
	2206	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
	2207
	2208	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
	2209	rays.push_back(*rit);
	2210	}
	2211	}
	2212
	2213
[574]	2214	void VspBspTree::ValidateTree()
	2215	{
	2216	stack<BspNode *> nodeStack;
	2217
	2218	if (!mRoot)
	2219	return;
	2220
	2221	nodeStack.push(mRoot);
	2222
	2223	mBspStats.invalidLeaves = 0;
	2224	while (!nodeStack.empty())
	2225	{
	2226	BspNode *node = nodeStack.top();
	2227	nodeStack.pop();
	2228
	2229	if (node->IsLeaf())
	2230	{
	2231	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	2232
	2233	if (!leaf->GetViewCell()->GetValid())
	2234	++ mBspStats.invalidLeaves;
	2235
	2236	// validity flags don't match => repair
	2237	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
	2238	{
	2239	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
	2240	PropagateUpValidity(leaf);
[542]	2241	}
	2242	}
	2243	else
	2244	{
	2245	BspInterior interior = dynamic_cast<BspInterior >(node);
	2246
	2247	nodeStack.push(interior->GetFront());
	2248	nodeStack.push(interior->GetBack());
	2249	}
	2250	}
[562]	2251
[574]	2252	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
[542]	2253	}
	2254
[547]	2255
[574]	2256
[547]	2257	void VspBspTree::CollectViewCells(BspNode *root,
	2258	bool onlyValid,
[532]	2259	ViewCellContainer &viewCells,
	2260	bool onlyUnmailed) const
	2261	{
[498]	2262	stack<BspNode *> nodeStack;
[463]	2263
[538]	2264	if (!root)
[508]	2265	return;
[463]	2266
[538]	2267	nodeStack.push(root);
[498]	2268
	2269	while (!nodeStack.empty())
	2270	{
	2271	BspNode *node = nodeStack.top();
	2272	nodeStack.pop();
	2273
	2274	if (node->IsLeaf())
	2275	{
[564]	2276	if (!onlyValid \|\| node->TreeValid())
[498]	2277	{
[590]	2278	ViewCell *viewCell =
	2279	mViewCellsTree->GetActiveViewCell(dynamic_cast<BspLeaf *>(node)->GetViewCell());
	2280
[532]	2281	if (!onlyUnmailed \|\| !viewCell->Mailed())
[498]	2282	{
	2283	viewCell->Mail();
	2284	viewCells.push_back(viewCell);
	2285	}
	2286	}
	2287	}
	2288	else
	2289	{
	2290	BspInterior interior = dynamic_cast<BspInterior >(node);
[508]	2291
[498]	2292	nodeStack.push(interior->GetFront());
	2293	nodeStack.push(interior->GetBack());
	2294	}
	2295	}
[590]	2296
[463]	2297	}
	2298
	2299
[648]	2300	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
	2301	{
	2302	// preprocess: throw out polygons coincident to the view space box (not needed)
	2303	PolygonContainer boxPolys;
	2304	mBox.ExtractPolys(boxPolys);
	2305	vector<Plane3> boxPlanes;
	2306
	2307	PolygonContainer::iterator pit, pit_end = boxPolys.end();
	2308
	2309	// extract planes of box
	2310	// TODO: can be done more elegantly than first extracting polygons
	2311	// and take their planes
	2312	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
	2313	{
	2314	boxPlanes.push_back((*pit)->GetSupportingPlane());
	2315	}
	2316
	2317	pit_end = polys.end();
	2318
	2319	for (pit = polys.begin(); pit != pit_end; ++ pit)
	2320	{
	2321	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
	2322
	2323	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
	2324	{
	2325	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
	2326
	2327	if (cf == Polygon3::COINCIDENT)
	2328	{
	2329	DEL_PTR(*pit);
	2330	//Debug << "coincident!!" << endl;
	2331	}
	2332	}
	2333	}
	2334
	2335	// remove deleted entries
	2336	for (int i = 0; i < (int)polys.size(); ++ i)
	2337	{
	2338	while (!polys[i] && (i < (int)polys.size()))
	2339	{
	2340	swap(polys[i], polys.back());
	2341	polys.pop_back();
	2342	}
	2343	}
	2344	}
	2345
	2346
[463]	2347	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
	2348	{
	2349	float len = 0;
	2350
	2351	RayInfoContainer::const_iterator it, it_end = rays.end();
	2352
	2353	for (it = rays.begin(); it != it_end; ++ it)
	2354	len += (*it).SegmentLength();
	2355
	2356	return len;
	2357	}
	2358
[479]	2359
[463]	2360	int VspBspTree::SplitRays(const Plane3 &plane,
[482]	2361	RayInfoContainer &rays,
	2362	RayInfoContainer &frontRays,
[639]	2363	RayInfoContainer &backRays) const
[463]	2364	{
	2365	int splits = 0;
	2366
[574]	2367	RayInfoContainer::const_iterator it, it_end = rays.end();
	2368
	2369	for (it = rays.begin(); it != it_end; ++ it)
[463]	2370	{
[574]	2371	RayInfo bRay = *it;
	2372
[463]	2373	VssRay *ray = bRay.mRay;
[473]	2374	float t;
[463]	2375
[485]	2376	// get classification and receive new t
[463]	2377	const int cf = bRay.ComputeRayIntersection(plane, t);
[482]	2378
[463]	2379	switch (cf)
	2380	{
	2381	case -1:
	2382	backRays.push_back(bRay);
	2383	break;
	2384	case 1:
	2385	frontRays.push_back(bRay);
	2386	break;
[482]	2387	case 0:
	2388	{
[485]	2389	//-- split ray
[639]	2390	// test if start point behind or in front of plane
[485]	2391	const int side = plane.Side(bRay.ExtrapOrigin());
	2392
	2393	if (side <= 0)
	2394	{
	2395	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
	2396	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
	2397	}
	2398	else
	2399	{
	2400	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
	2401	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
	2402	}
[463]	2403	}
	2404	break;
	2405	default:
[485]	2406	Debug << "Should not come here" << endl;
[463]	2407	break;
	2408	}
	2409	}
	2410
	2411	return splits;
	2412	}
	2413
[479]	2414
[463]	2415	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
	2416	{
	2417	BspNode *lastNode;
	2418
	2419	do
	2420	{
	2421	lastNode = n;
	2422
	2423	// want to get planes defining geometry of this node => don't take
	2424	// split plane of node itself
	2425	n = n->GetParent();
[482]	2426
[463]	2427	if (n)
	2428	{
	2429	BspInterior interior = dynamic_cast<BspInterior >(n);
	2430	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
	2431
	2432	if (interior->GetFront() != lastNode)
	2433	halfSpace.ReverseOrientation();
	2434
	2435	halfSpaces.push_back(halfSpace);
	2436	}
	2437	}
	2438	while (n);
	2439	}
	2440
[485]	2441
[482]	2442	void VspBspTree::ConstructGeometry(BspNode *n,
[503]	2443	BspNodeGeometry &geom) const
[463]	2444	{
[437]	2445	vector<Plane3> halfSpaces;
	2446	ExtractHalfSpaces(n, halfSpaces);
	2447
	2448	PolygonContainer candidatePolys;
	2449
	2450	// bounded planes are added to the polygons (reverse polygons
	2451	// as they have to be outfacing
	2452	for (int i = 0; i < (int)halfSpaces.size(); ++ i)
	2453	{
	2454	Polygon3 *p = GetBoundingBox().CrossSection(halfSpaces[i]);
[482]	2455
[448]	2456	if (p->Valid(mEpsilon))
[437]	2457	{
	2458	candidatePolys.push_back(p->CreateReversePolygon());
	2459	DEL_PTR(p);
	2460	}
	2461	}
	2462
	2463	// add faces of bounding box (also could be faces of the cell)
	2464	for (int i = 0; i < 6; ++ i)
	2465	{
	2466	VertexContainer vertices;
[482]	2467
[437]	2468	for (int j = 0; j < 4; ++ j)
	2469	vertices.push_back(mBox.GetFace(i).mVertices[j]);
	2470
	2471	candidatePolys.push_back(new Polygon3(vertices));
	2472	}
	2473
	2474	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
	2475	{
	2476	// polygon is split by all other planes
	2477	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
	2478	{
	2479	if (i == j) // polygon and plane are coincident
	2480	continue;
	2481
	2482	VertexContainer splitPts;
	2483	Polygon3 frontPoly, backPoly;
	2484
[482]	2485	const int cf =
[448]	2486	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
	2487	mEpsilon);
[482]	2488
[437]	2489	switch (cf)
	2490	{
	2491	case Polygon3::SPLIT:
	2492	frontPoly = new Polygon3();
	2493	backPoly = new Polygon3();
	2494
[482]	2495	candidatePolys[i]->Split(halfSpaces[j],
	2496	*frontPoly,
[448]	2497	*backPoly,
	2498	mEpsilon);
[437]	2499
	2500	DEL_PTR(candidatePolys[i]);
	2501
[448]	2502	if (frontPoly->Valid(mEpsilon))
[437]	2503	candidatePolys[i] = frontPoly;
	2504	else
	2505	DEL_PTR(frontPoly);
	2506
	2507	DEL_PTR(backPoly);
	2508	break;
	2509	case Polygon3::BACK_SIDE:
	2510	DEL_PTR(candidatePolys[i]);
	2511	break;
	2512	// just take polygon as it is
	2513	case Polygon3::FRONT_SIDE:
	2514	case Polygon3::COINCIDENT:
	2515	default:
	2516	break;
	2517	}
	2518	}
[482]	2519
[437]	2520	if (candidatePolys[i])
[503]	2521	geom.mPolys.push_back(candidatePolys[i]);
[437]	2522	}
[463]	2523	}
	2524
[485]	2525
[582]	2526	void VspBspTree::ConstructGeometry(ViewCell *vc,
[503]	2527	BspNodeGeometry &vcGeom) const
[589]	2528	{
[580]	2529	ViewCellContainer leaves;
[590]	2530
	2531	mViewCellsTree->CollectLeaves(vc, leaves);
[463]	2532
[580]	2533	ViewCellContainer::const_iterator it, it_end = leaves.end();
	2534
[463]	2535	for (it = leaves.begin(); it != it_end; ++ it)
[580]	2536	{
	2537	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
[590]	2538
[580]	2539	ConstructGeometry(l, vcGeom);
	2540	}
[463]	2541	}
	2542
[485]	2543
[551]	2544	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
	2545
[557]	2546
[482]	2547	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
[562]	2548	const bool onlyUnmailed) const
[463]	2549	{
[551]	2550	stack<bspNodePair> nodeStack;
	2551
	2552	BspNodeGeometry nodeGeom;
	2553	ConstructGeometry(n, nodeGeom);
	2554
[500]	2555	// split planes from the root to this node
	2556	// needed to verify that we found neighbor leaf
[557]	2557	// TODO: really needed?
[463]	2558	vector<Plane3> halfSpaces;
	2559	ExtractHalfSpaces(n, halfSpaces);
	2560
[551]	2561
	2562	BspNodeGeometry *rgeom = new BspNodeGeometry();
	2563	ConstructGeometry(mRoot, *rgeom);
	2564
	2565	nodeStack.push(bspNodePair(mRoot, rgeom));
	2566
[482]	2567	while (!nodeStack.empty())
[463]	2568	{
[551]	2569	BspNode *node = nodeStack.top().first;
	2570	BspNodeGeometry *geom = nodeStack.top().second;
[562]	2571
[463]	2572	nodeStack.pop();
	2573
[557]	2574	if (node->IsLeaf())
[562]	2575	{
[557]	2576	// test if this leaf is in valid view space
	2577	if (node->TreeValid() &&
	2578	(node != n) &&
	2579	(!onlyUnmailed \|\| !node->Mailed()))
	2580	{
	2581	bool isAdjacent = true;
[551]	2582
[570]	2583	if (1)
[557]	2584	{
[562]	2585	// test all planes of current node if still adjacent
	2586	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
	2587	{
	2588	const int cf =
	2589	Polygon3::ClassifyPlane(geom->mPolys,
	2590	halfSpaces[i],
	2591	mEpsilon);
[482]	2592
[562]	2593	if (cf == Polygon3::BACK_SIDE)
	2594	{
	2595	isAdjacent = false;
	2596	}
[557]	2597	}
	2598	}
[562]	2599	else
[557]	2600	{
[562]	2601	// TODO: why is this wrong??
	2602	// test all planes of current node if still adjacent
	2603	for (int i = 0; (i < (int)nodeGeom.mPolys.size()) && isAdjacent; ++ i)
	2604	{
	2605	Polygon3 *poly = nodeGeom.mPolys[i];
[555]	2606
[562]	2607	const int cf =
	2608	Polygon3::ClassifyPlane(geom->mPolys,
	2609	poly->GetSupportingPlane(),
	2610	mEpsilon);
[557]	2611
[562]	2612	if (cf == Polygon3::BACK_SIDE)
	2613	{
	2614	isAdjacent = false;
	2615	}
[557]	2616	}
[570]	2617	}
[557]	2618	// neighbor was found
	2619	if (isAdjacent)
[562]	2620	{
[551]	2621	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
[562]	2622	}
[463]	2623	}
[562]	2624	}
	2625	else
	2626	{
	2627	BspInterior interior = dynamic_cast<BspInterior >(node);
[482]	2628
[562]	2629	const int cf = Polygon3::ClassifyPlane(nodeGeom.mPolys,
	2630	interior->GetPlane(),
	2631	mEpsilon);
[551]	2632
[562]	2633	BspNode *front = interior->GetFront();
	2634	BspNode *back = interior->GetBack();
[551]	2635
[562]	2636	BspNodeGeometry *fGeom = new BspNodeGeometry();
	2637	BspNodeGeometry *bGeom = new BspNodeGeometry();
[463]	2638
[562]	2639	geom->SplitGeometry(*fGeom,
	2640	*bGeom,
	2641	interior->GetPlane(),
	2642	mBox,
	2643	mEpsilon);
[551]	2644
[562]	2645	if (cf == Polygon3::FRONT_SIDE)
	2646	{
	2647	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	2648	DEL_PTR(bGeom);
	2649	}
	2650	else
	2651	{
	2652	if (cf == Polygon3::BACK_SIDE)
[551]	2653	{
[562]	2654	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	2655	DEL_PTR(fGeom);
[551]	2656	}
[482]	2657	else
[562]	2658	{ // random decision
	2659	nodeStack.push(bspNodePair(front, fGeom));
	2660	nodeStack.push(bspNodePair(back, bGeom));
[463]	2661	}
[551]	2662	}
[463]	2663	}
[562]	2664
[551]	2665	DEL_PTR(geom);
[463]	2666	}
[482]	2667
[463]	2668	return (int)neighbors.size();
	2669	}
	2670
[489]	2671
[600]	2672
	2673	int VspBspTree::FindApproximateNeighbors(BspNode n, vector<BspLeaf > &neighbors,
	2674	const bool onlyUnmailed) const
	2675	{
	2676	stack<bspNodePair> nodeStack;
	2677
	2678	BspNodeGeometry nodeGeom;
	2679	ConstructGeometry(n, nodeGeom);
	2680
	2681	// split planes from the root to this node
	2682	// needed to verify that we found neighbor leaf
	2683	// TODO: really needed?
	2684	vector<Plane3> halfSpaces;
	2685	ExtractHalfSpaces(n, halfSpaces);
	2686
	2687
	2688	BspNodeGeometry *rgeom = new BspNodeGeometry();
	2689	ConstructGeometry(mRoot, *rgeom);
	2690
	2691	nodeStack.push(bspNodePair(mRoot, rgeom));
	2692
	2693	while (!nodeStack.empty())
	2694	{
	2695	BspNode *node = nodeStack.top().first;
	2696	BspNodeGeometry *geom = nodeStack.top().second;
	2697
	2698	nodeStack.pop();
	2699
	2700	if (node->IsLeaf())
	2701	{
	2702	// test if this leaf is in valid view space
	2703	if (node->TreeValid() &&
	2704	(node != n) &&
	2705	(!onlyUnmailed \|\| !node->Mailed()))
	2706	{
	2707	bool isAdjacent = true;
	2708
	2709	// neighbor was found
	2710	if (isAdjacent)
	2711	{
	2712	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
	2713	}
	2714	}
	2715	}
	2716	else
	2717	{
	2718	BspInterior interior = dynamic_cast<BspInterior >(node);
	2719
	2720	const int cf = Polygon3::ClassifyPlane(nodeGeom.mPolys,
	2721	interior->GetPlane(),
	2722	mEpsilon);
	2723
	2724	BspNode *front = interior->GetFront();
	2725	BspNode *back = interior->GetBack();
	2726
	2727	BspNodeGeometry *fGeom = new BspNodeGeometry();
	2728	BspNodeGeometry *bGeom = new BspNodeGeometry();
	2729
	2730	geom->SplitGeometry(*fGeom,
	2731	*bGeom,
	2732	interior->GetPlane(),
	2733	mBox,
	2734	mEpsilon);
	2735
	2736	if (cf == Polygon3::FRONT_SIDE)
	2737	{
	2738	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	2739	DEL_PTR(bGeom);
	2740	}
	2741	else
	2742	{
	2743	if (cf == Polygon3::BACK_SIDE)
	2744	{
	2745	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	2746	DEL_PTR(fGeom);
	2747	}
	2748	else
	2749	{ // random decision
	2750	nodeStack.push(bspNodePair(front, fGeom));
	2751	nodeStack.push(bspNodePair(back, bGeom));
	2752	}
	2753	}
	2754	}
	2755
	2756	DEL_PTR(geom);
	2757	}
	2758
	2759	return (int)neighbors.size();
	2760	}
	2761
	2762
	2763
[463]	2764	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
	2765	{
	2766	stack<BspNode *> nodeStack;
	2767	nodeStack.push(mRoot);
[482]	2768
[463]	2769	int mask = rand();
[482]	2770
	2771	while (!nodeStack.empty())
[463]	2772	{
	2773	BspNode *node = nodeStack.top();
	2774	nodeStack.pop();
[482]	2775
	2776	if (node->IsLeaf())
[463]	2777	{
	2778	return dynamic_cast<BspLeaf *>(node);
[482]	2779	}
	2780	else
[463]	2781	{
	2782	BspInterior interior = dynamic_cast<BspInterior >(node);
	2783	BspNode *next;
[503]	2784	BspNodeGeometry geom;
[482]	2785
[463]	2786	// todo: not very efficient: constructs full cell everytime
[498]	2787	ConstructGeometry(interior, geom);
[463]	2788
[503]	2789	const int cf =
	2790	Polygon3::ClassifyPlane(geom.mPolys, halfspace, mEpsilon);
[463]	2791
	2792	if (cf == Polygon3::BACK_SIDE)
	2793	next = interior->GetFront();
	2794	else
	2795	if (cf == Polygon3::FRONT_SIDE)
	2796	next = interior->GetFront();
[482]	2797	else
[463]	2798	{
	2799	// random decision
	2800	if (mask & 1)
	2801	next = interior->GetBack();
	2802	else
	2803	next = interior->GetFront();
	2804	mask = mask >> 1;
	2805	}
	2806
	2807	nodeStack.push(next);
	2808	}
	2809	}
[482]	2810
[463]	2811	return NULL;
	2812	}
	2813
	2814	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
	2815	{
	2816	stack<BspNode *> nodeStack;
[482]	2817
[463]	2818	nodeStack.push(mRoot);
	2819
	2820	int mask = rand();
[482]	2821
	2822	while (!nodeStack.empty())
[463]	2823	{
	2824	BspNode *node = nodeStack.top();
	2825	nodeStack.pop();
[482]	2826
	2827	if (node->IsLeaf())
[463]	2828	{
	2829	if ( (!onlyUnmailed \|\| !node->Mailed()) )
	2830	return dynamic_cast<BspLeaf *>(node);
	2831	}
[482]	2832	else
[463]	2833	{
	2834	BspInterior interior = dynamic_cast<BspInterior >(node);
	2835
	2836	// random decision
	2837	if (mask & 1)
	2838	nodeStack.push(interior->GetBack());
	2839	else
	2840	nodeStack.push(interior->GetFront());
	2841
	2842	mask = mask >> 1;
	2843	}
	2844	}
[482]	2845
[463]	2846	return NULL;
	2847	}
	2848
	2849	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
	2850	{
	2851	int pvsSize = 0;
	2852
	2853	RayInfoContainer::const_iterator rit, rit_end = rays.end();
	2854
	2855	Intersectable::NewMail();
	2856
	2857	for (rit = rays.begin(); rit != rays.end(); ++ rit)
	2858	{
	2859	VssRay ray = (rit).mRay;
[482]	2860
[463]	2861	if (ray->mOriginObject)
	2862	{
	2863	if (!ray->mOriginObject->Mailed())
	2864	{
	2865	ray->mOriginObject->Mail();
	2866	++ pvsSize;
	2867	}
	2868	}
	2869	if (ray->mTerminationObject)
	2870	{
	2871	if (!ray->mTerminationObject->Mailed())
	2872	{
	2873	ray->mTerminationObject->Mail();
	2874	++ pvsSize;
	2875	}
	2876	}
	2877	}
	2878
	2879	return pvsSize;
	2880	}
	2881
	2882	float VspBspTree::GetEpsilon() const
	2883	{
	2884	return mEpsilon;
	2885	}
	2886
	2887
	2888	int VspBspTree::SplitPolygons(const Plane3 &plane,
[482]	2889	PolygonContainer &polys,
	2890	PolygonContainer &frontPolys,
	2891	PolygonContainer &backPolys,
[463]	2892	PolygonContainer &coincident) const
	2893	{
	2894	int splits = 0;
	2895
[574]	2896	PolygonContainer::const_iterator it, it_end = polys.end();
	2897
	2898	for (it = polys.begin(); it != polys.end(); ++ it)
[463]	2899	{
[574]	2900	Polygon3 poly = it;
[463]	2901
	2902	// classify polygon
	2903	const int cf = poly->ClassifyPlane(plane, mEpsilon);
	2904
	2905	switch (cf)
	2906	{
	2907	case Polygon3::COINCIDENT:
	2908	coincident.push_back(poly);
[482]	2909	break;
	2910	case Polygon3::FRONT_SIDE:
[463]	2911	frontPolys.push_back(poly);
	2912	break;
	2913	case Polygon3::BACK_SIDE:
	2914	backPolys.push_back(poly);
	2915	break;
	2916	case Polygon3::SPLIT:
	2917	backPolys.push_back(poly);
	2918	frontPolys.push_back(poly);
	2919	++ splits;
	2920	break;
	2921	default:
	2922	Debug << "SHOULD NEVER COME HERE\n";
	2923	break;
	2924	}
	2925	}
	2926
	2927	return splits;
	2928	}
[466]	2929
	2930
[469]	2931	int VspBspTree::CastLineSegment(const Vector3 &origin,
	2932	const Vector3 &termination,
	2933	vector<ViewCell *> &viewcells)
[466]	2934	{
[469]	2935	int hits = 0;
[600]	2936	stack<BspRayTraversalData> tQueue;
[482]	2937
[469]	2938	float mint = 0.0f, maxt = 1.0f;
[482]	2939
[469]	2940	Intersectable::NewMail();
[600]	2941	ViewCell::NewMail();
[482]	2942
[469]	2943	Vector3 entp = origin;
	2944	Vector3 extp = termination;
[482]	2945
[469]	2946	BspNode *node = mRoot;
	2947	BspNode *farChild = NULL;
[482]	2948
[485]	2949	float t;
[482]	2950	while (1)
[469]	2951	{
[482]	2952	if (!node->IsLeaf())
[469]	2953	{
	2954	BspInterior in = dynamic_cast<BspInterior >(node);
[482]	2955
[469]	2956	Plane3 splitPlane = in->GetPlane();
[485]	2957
[469]	2958	const int entSide = splitPlane.Side(entp);
	2959	const int extSide = splitPlane.Side(extp);
[482]	2960
[485]	2961	if (entSide < 0)
[469]	2962	{
[576]	2963	node = in->GetBack();
	2964	// plane does not split ray => no far child
	2965	if (extSide <= 0)
	2966	continue;
	2967
	2968	farChild = in->GetFront(); // plane splits ray
[485]	2969	}
	2970	else if (entSide > 0)
[469]	2971	{
[576]	2972	node = in->GetFront();
[482]	2973
[576]	2974	if (extSide >= 0) // plane does not split ray => no far child
	2975	continue;
[482]	2976
	2977	farChild = in->GetBack(); // plane splits ray
[469]	2978	}
[485]	2979	else // ray end point on plane
	2980	{ // NOTE: what to do if ray is coincident with plane?
	2981	if (extSide < 0)
	2982	node = in->GetBack();
[487]	2983	else
[485]	2984	node = in->GetFront();
[487]	2985
[485]	2986	continue; // no far child
[469]	2987	}
[482]	2988
[469]	2989	// push data for far child
[600]	2990	tQueue.push(BspRayTraversalData(farChild, extp));
[482]	2991
[469]	2992	// find intersection of ray segment with plane
	2993	extp = splitPlane.FindIntersection(origin, extp, &t);
[485]	2994	}
	2995	else
[469]	2996	{
	2997	// reached leaf => intersection with view cell
	2998	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
[482]	2999
[590]	3000	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
	3001	if (!viewCell->Mailed())
[469]	3002	{
[590]	3003	viewcells.push_back(viewCell);
	3004	viewCell->Mail();
[469]	3005	++ hits;
	3006	}
[482]	3007
[469]	3008	//-- fetch the next far child from the stack
[600]	3009	if (tQueue.empty())
[469]	3010	break;
[482]	3011
[469]	3012	entp = extp;
[485]	3013
[600]	3014	BspRayTraversalData &s = tQueue.top();
[482]	3015
[469]	3016	node = s.mNode;
	3017	extp = s.mExitPoint;
[482]	3018
[600]	3019	tQueue.pop();
[469]	3020	}
[466]	3021	}
[487]	3022
[469]	3023	return hits;
[466]	3024	}
[478]	3025
[576]	3026
	3027
	3028
[485]	3029	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
[482]	3030	{
	3031	std::deque<BspNode *> path1;
	3032	BspNode *p1 = n1;
[479]	3033
[482]	3034	// create path from node 1 to root
	3035	while (p1)
	3036	{
	3037	if (p1 == n2) // second node on path
	3038	return (int)path1.size();
	3039
	3040	path1.push_front(p1);
	3041	p1 = p1->GetParent();
	3042	}
	3043
	3044	int depth = n2->GetDepth();
	3045	int d = depth;
	3046
	3047	BspNode *p2 = n2;
	3048
	3049	// compare with same depth
	3050	while (1)
	3051	{
	3052	if ((d < (int)path1.size()) && (p2 == path1[d]))
	3053	return (depth - d) + ((int)path1.size() - 1 - d);
	3054
	3055	-- d;
	3056	p2 = p2->GetParent();
	3057	}
	3058
	3059	return 0; // never come here
	3060	}
	3061
[580]	3062
[501]	3063	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
[479]	3064	{
[590]	3065	// TODO
	3066	#if VC_HISTORY
[495]	3067	if (node->IsLeaf())
[479]	3068	return node;
	3069
[492]	3070	BspInterior interior = dynamic_cast<BspInterior >(node);
	3071
[501]	3072	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
	3073	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
[492]	3074
[479]	3075	if (front->IsLeaf() && back->IsLeaf())
	3076	{
	3077	BspLeaf frontLeaf = dynamic_cast<BspLeaf >(front);
	3078	BspLeaf backLeaf = dynamic_cast<BspLeaf >(back);
	3079
	3080	//-- collapse tree
	3081	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
	3082	{
	3083	BspViewCell *vc = frontLeaf->GetViewCell();
	3084
	3085	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
[489]	3086	leaf->SetTreeValid(frontLeaf->TreeValid());
[482]	3087
[479]	3088	// replace a link from node's parent
	3089	if (leaf->GetParent())
	3090	leaf->GetParent()->ReplaceChildLink(node, leaf);
[517]	3091	else
	3092	mRoot = leaf;
	3093
[501]	3094	++ collapsed;
[479]	3095	delete interior;
	3096
	3097	return leaf;
	3098	}
	3099	}
[590]	3100	#endif
[495]	3101	return node;
	3102	}
	3103
	3104
[501]	3105	int VspBspTree::CollapseTree()
[495]	3106	{
[501]	3107	int collapsed = 0;
[580]	3108	//TODO
	3109	#if VC_HISTORY
[501]	3110	(void)CollapseTree(mRoot, collapsed);
[517]	3111
[485]	3112	// revalidate leaves
[517]	3113	RepairViewCellsLeafLists();
[580]	3114	#endif
[501]	3115	return collapsed;
[479]	3116	}
	3117
	3118
[517]	3119	void VspBspTree::RepairViewCellsLeafLists()
[492]	3120	{
[590]	3121	// TODO
	3122	#if VC_HISTORY
[479]	3123	// list not valid anymore => clear
[492]	3124	stack<BspNode *> nodeStack;
	3125	nodeStack.push(mRoot);
	3126
	3127	ViewCell::NewMail();
	3128
	3129	while (!nodeStack.empty())
	3130	{
	3131	BspNode *node = nodeStack.top();
	3132	nodeStack.pop();
	3133
	3134	if (node->IsLeaf())
	3135	{
	3136	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	3137
	3138	BspViewCell *viewCell = leaf->GetViewCell();
[590]	3139
[492]	3140	if (!viewCell->Mailed())
	3141	{
	3142	viewCell->mLeaves.clear();
	3143	viewCell->Mail();
	3144	}
[580]	3145
[492]	3146	viewCell->mLeaves.push_back(leaf);
[590]	3147
[492]	3148	}
	3149	else
	3150	{
	3151	BspInterior interior = dynamic_cast<BspInterior >(node);
	3152
	3153	nodeStack.push(interior->GetFront());
	3154	nodeStack.push(interior->GetBack());
	3155	}
[479]	3156	}
[590]	3157	// TODO
	3158	#endif
[479]	3159	}
	3160
	3161
[532]	3162	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
	3163
[535]	3164
[532]	3165	int VspBspTree::CastBeam(Beam &beam)
	3166	{
	3167	stack<bspNodePair> nodeStack;
	3168	BspNodeGeometry *rgeom = new BspNodeGeometry();
	3169	ConstructGeometry(mRoot, *rgeom);
	3170
	3171	nodeStack.push(bspNodePair(mRoot, rgeom));
	3172
	3173	ViewCell::NewMail();
	3174
	3175	while (!nodeStack.empty())
	3176	{
	3177	BspNode *node = nodeStack.top().first;
	3178	BspNodeGeometry *geom = nodeStack.top().second;
	3179	nodeStack.pop();
	3180
	3181	AxisAlignedBox3 box;
[535]	3182	box.Initialize();
	3183	geom->IncludeInBox(box);
[532]	3184
[535]	3185	const int side = beam.ComputeIntersection(box);
[532]	3186
	3187	switch (side)
	3188	{
	3189	case -1:
[547]	3190	CollectViewCells(node, true, beam.mViewCells, true);
[532]	3191	break;
	3192	case 0:
[535]	3193
[532]	3194	if (node->IsLeaf())
	3195	{
[535]	3196	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	3197
[532]	3198	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
[535]	3199	{
	3200	leaf->GetViewCell()->Mail();
[532]	3201	beam.mViewCells.push_back(leaf->GetViewCell());
[535]	3202	}
[532]	3203	}
	3204	else
	3205	{
	3206	BspInterior interior = dynamic_cast<BspInterior >(node);
[535]	3207
[538]	3208	BspNode *first = interior->GetFront();
	3209	BspNode *second = interior->GetBack();
[535]	3210
	3211	BspNodeGeometry *firstGeom = new BspNodeGeometry();
	3212	BspNodeGeometry *secondGeom = new BspNodeGeometry();
	3213
[538]	3214	geom->SplitGeometry(*firstGeom,
	3215	*secondGeom,
	3216	interior->GetPlane(),
	3217	mBox,
	3218	mEpsilon);
[535]	3219
[532]	3220	// decide on the order of the nodes
	3221	if (DotProd(beam.mPlanes[0].mNormal,
	3222	interior->GetPlane().mNormal) > 0)
	3223	{
	3224	swap(first, second);
[535]	3225	swap(firstGeom, secondGeom);
[532]	3226	}
	3227
[535]	3228	nodeStack.push(bspNodePair(first, firstGeom));
	3229	nodeStack.push(bspNodePair(second, secondGeom));
[532]	3230	}
[535]	3231
[532]	3232	break;
[538]	3233	default:
[532]	3234	// default: cull
[538]	3235	break;
[532]	3236	}
[538]	3237
[532]	3238	DEL_PTR(geom);
[535]	3239
[532]	3240	}
	3241
[538]	3242	return (int)beam.mViewCells.size();
[532]	3243	}
	3244
	3245
[485]	3246	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
[478]	3247	{
[485]	3248	mViewCellsManager = vcm;
	3249	}
	3250
	3251
[580]	3252	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
	3253	vector<MergeCandidate> &candidates)
[485]	3254	{
[478]	3255	BspLeaf::NewMail();
[508]	3256
[478]	3257	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
	3258
[580]	3259	int numCandidates = 0;
[509]	3260
[478]	3261	// find merge candidates and push them into queue
	3262	for (it = leaves.begin(); it != it_end; ++ it)
	3263	{
	3264	BspLeaf leaf = it;
[485]	3265
	3266	// the same leaves must not be part of two merge candidates
	3267	leaf->Mail();
[650]	3268
[485]	3269	vector<BspLeaf *> neighbors;
[650]	3270	if (0)
	3271	FindNeighbors(leaf, neighbors, true);
	3272	else
	3273	FindApproximateNeighbors(leaf, neighbors, true);
[485]	3274	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
	3275
	3276	// TODO: test if at least one ray goes from one leaf to the other
	3277	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
[508]	3278	{
	3279	if ((*nit)->GetViewCell() != leaf->GetViewCell())
[509]	3280	{
[580]	3281	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
	3282	candidates.push_back(mc);
[564]	3283
[580]	3284	++ numCandidates;
	3285	if ((numCandidates % 1000) == 0)
[566]	3286	{
[580]	3287	cout << "collected " << numCandidates << " merge candidates" << endl;
[566]	3288	}
[509]	3289	}
[485]	3290	}
	3291	}
	3292
[580]	3293	Debug << "merge queue: " << (int)candidates.size() << endl;
	3294	Debug << "leaves in queue: " << numCandidates << endl;
	3295
[508]	3296
[485]	3297	return (int)leaves.size();
	3298	}
	3299
	3300
[580]	3301	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
	3302	vector<MergeCandidate> &candidates)
[485]	3303	{
[547]	3304	ViewCell::NewMail();
[503]	3305	long startTime = GetTime();
[574]	3306
[485]	3307	map<BspLeaf , vector<BspLeaf> > neighborMap;
[574]	3308	ViewCellContainer::const_iterator iit;
[485]	3309
[503]	3310	int numLeaves = 0;
[485]	3311
	3312	BspLeaf::NewMail();
	3313
[574]	3314	for (int i = 0; i < (int)rays.size(); ++ i)
[485]	3315	{
[574]	3316	VssRay *ray = rays[i];
[547]	3317
[485]	3318	// traverse leaves stored in the rays and compare and
	3319	// merge consecutive leaves (i.e., the neighbors in the tree)
[574]	3320	if (ray->mViewCells.size() < 2)
[485]	3321	continue;
[580]	3322	//TODO viewcellhierarchy
[574]	3323	iit = ray->mViewCells.begin();
	3324	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
[580]	3325	BspLeaf *leaf = bspVc->mLeaf;
[485]	3326
	3327	// traverse intersections
[489]	3328	// consecutive leaves are neighbors => add them to queue
[574]	3329	for (; iit != ray->mViewCells.end(); ++ iit)
[485]	3330	{
[489]	3331	// next pair
	3332	BspLeaf *prevLeaf = leaf;
[574]	3333	bspVc = dynamic_cast<BspViewCell >(iit);
[580]	3334	leaf = bspVc->mLeaf;
[489]	3335
[508]	3336	// view space not valid or same view cell
	3337	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
	3338	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
[489]	3339	continue;
	3340
[580]	3341	vector<BspLeaf *> &neighbors = neighborMap[leaf];
[485]	3342
	3343	bool found = false;
[478]	3344
[485]	3345	// both leaves inserted in queue already =>
	3346	// look if double pair already exists
	3347	if (leaf->Mailed() && prevLeaf->Mailed())
[478]	3348	{
[485]	3349	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
	3350
	3351	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
	3352	if (*it == prevLeaf)
	3353	found = true; // already in queue
	3354	}
[547]	3355
[485]	3356	if (!found)
	3357	{
[564]	3358	// this pair is not in map yet
[485]	3359	// => insert into the neighbor map and the queue
	3360	neighbors.push_back(prevLeaf);
	3361	neighborMap[prevLeaf].push_back(leaf);
[478]	3362
[485]	3363	leaf->Mail();
	3364	prevLeaf->Mail();
[547]	3365
[580]	3366	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
	3367
	3368	candidates.push_back(mc);
[564]	3369
[580]	3370	if (((int)candidates.size() % 1000) == 0)
[564]	3371	{
[580]	3372	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
[564]	3373	}
[478]	3374	}
[485]	3375	}
	3376	}
[564]	3377
[485]	3378	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
[580]	3379	Debug << "merge queue: " << (int)candidates.size() << endl;
[503]	3380	Debug << "leaves in queue: " << numLeaves << endl;
[485]	3381
[580]	3382
[503]	3383	//-- collect the leaves which haven't been found by ray casting
[542]	3384	if (0)
	3385	{
[551]	3386	cout << "finding additional merge candidates using geometry" << endl;
[542]	3387	vector<BspLeaf *> leaves;
[547]	3388	CollectLeaves(leaves, true);
[542]	3389	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
[580]	3390	CollectMergeCandidates(leaves, candidates);
[542]	3391	}
[503]	3392
	3393	return numLeaves;
[485]	3394	}
	3395
	3396
	3397
	3398
[508]	3399	ViewCell *VspBspTree::GetViewCell(const Vector3 &point)
[492]	3400	{
	3401	if (mRoot == NULL)
	3402	return NULL;
	3403
	3404	stack<BspNode *> nodeStack;
	3405	nodeStack.push(mRoot);
	3406
	3407	ViewCell *viewcell = NULL;
	3408
	3409	while (!nodeStack.empty()) {
	3410	BspNode *node = nodeStack.top();
	3411	nodeStack.pop();
	3412
	3413	if (node->IsLeaf()) {
	3414	viewcell = dynamic_cast<BspLeaf *>(node)->GetViewCell();
	3415	break;
	3416	} else {
	3417
	3418	BspInterior interior = dynamic_cast<BspInterior >(node);
	3419
	3420	// random decision
	3421	if (interior->GetPlane().Side(point) < 0)
	3422	nodeStack.push(interior->GetBack());
	3423	else
	3424	nodeStack.push(interior->GetFront());
	3425	}
	3426	}
	3427
	3428	return viewcell;
	3429	}
	3430
	3431
[487]	3432	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
	3433	{
	3434	BspNode *node = mRoot;
[485]	3435
[487]	3436	while (1)
	3437	{
	3438	// early exit
	3439	if (node->TreeValid())
	3440	return true;
	3441
	3442	if (node->IsLeaf())
	3443	return false;
	3444
	3445	BspInterior in = dynamic_cast<BspInterior >(node);
[490]	3446
	3447	if (in->GetPlane().Side(viewPoint) <= 0)
[487]	3448	{
	3449	node = in->GetBack();
	3450	}
	3451	else
	3452	{
	3453	node = in->GetFront();
	3454	}
	3455	}
	3456
	3457	// should never come here
	3458	return false;
	3459	}
	3460
	3461
	3462	void VspBspTree::PropagateUpValidity(BspNode *node)
	3463	{
[574]	3464	const bool isValid = node->TreeValid();
	3465
	3466	// propagative up invalid flag until only invalid nodes exist over this node
	3467	if (!isValid)
[487]	3468	{
[574]	3469	while (!node->IsRoot() && node->GetParent()->TreeValid())
	3470	{
	3471	node = node->GetParent();
	3472	node->SetTreeValid(false);
	3473	}
[487]	3474	}
[574]	3475	else
	3476	{
	3477	// propagative up valid flag until one of the subtrees is invalid
	3478	while (!node->IsRoot() && !node->TreeValid())
	3479	{
	3480	node = node->GetParent();
	3481	BspInterior interior = dynamic_cast<BspInterior >(node);
	3482
	3483	// the parent is valid iff both leaves are valid
	3484	node->SetTreeValid(interior->GetBack()->TreeValid() &&
	3485	interior->GetFront()->TreeValid());
	3486	}
	3487	}
[487]	3488	}
	3489
[508]	3490
	3491	bool VspBspTree::Export(ofstream &stream)
[503]	3492	{
[508]	3493	ExportNode(mRoot, stream);
[487]	3494
[503]	3495	return true;
	3496	}
	3497
	3498
[508]	3499	void VspBspTree::ExportNode(BspNode *node, ofstream &stream)
	3500	{
	3501	if (node->IsLeaf())
[503]	3502	{
[508]	3503	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
[590]	3504	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
	3505
[508]	3506	int id = -1;
[590]	3507	if (viewCell != mOutOfBoundsCell)
	3508	id = viewCell->GetId();
[503]	3509
[508]	3510	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
[503]	3511	}
[508]	3512	else
[503]	3513	{
[508]	3514	BspInterior interior = dynamic_cast<BspInterior >(node);
	3515
	3516	Plane3 plane = interior->GetPlane();
	3517	stream << "<Interior plane=\"" << plane.mNormal.x << " "
	3518	<< plane.mNormal.y << " " << plane.mNormal.z << " "
	3519	<< plane.mD << "\">" << endl;
[503]	3520
[508]	3521	ExportNode(interior->GetBack(), stream);
	3522	ExportNode(interior->GetFront(), stream);
[503]	3523
[508]	3524	stream << "</Interior>" << endl;
[503]	3525	}
	3526	}

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