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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 1023

Revision 1023, 96.3 KB checked in by mattausch, 18 years ago (diff)

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

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