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source: GTP/trunk/Lib/Vis/Preprocessing/src/FromPointVisibilityTree.cpp @ 1006

Revision 1006, 97.3 KB checked in by mattausch, 18 years ago (diff)
started viewspace-objectspace subdivision removed memory leaks

Line
1	#include <stack>
2	#include <time.h>
3	#include <iomanip>
4
5	#include "Plane3.h"
6	#include "FromPointVisibilityTree.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
24
25	//-- static members
26
27
28	int FromPointVisibilityTree::sFrontId = 0;
29	int FromPointVisibilityTree::sBackId = 0;
30	int FromPointVisibilityTree::sFrontAndBackId = 0;
31
32	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
33
34
35	// pvs penalty can be different from pvs size
36	inline static float EvalPvsPenalty(const int pvs,
37	const int lower,
38	const int upper)
39	{
40	// clamp to minmax values
41	if (pvs < lower)
42	return (float)lower;
43	if (pvs > upper)
44	return (float)upper;
45
46	return (float)pvs;
47	}
48
49
50
51
52	/******************************************************************************/
53	/* class FromPointVisibilityTree implementation */
54	/******************************************************************************/
55
56
57	FromPointVisibilityTree::FromPointVisibilityTree():
58	mRoot(NULL),
59	mUseAreaForPvs(false),
60	mCostNormalizer(Limits::Small),
61	mViewCellsManager(NULL),
62	mOutOfBoundsCell(NULL),
63	mStoreRays(false),
64	mRenderCostWeight(0.5),
65	mUseRandomAxis(false),
66	mTimeStamp(1)
67	{
68	bool randomize = false;
69	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.Construction.randomize", randomize);
70	if (randomize)
71	Randomize(); // initialise random generator for heuristics
72
73	//-- termination criteria for autopartition
74	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.maxDepth", mTermMaxDepth);
75	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.minPvs", mTermMinPvs);
76	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.minRays", mTermMinRays);
77	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.minProbability", mTermMinProbability);
78	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.maxRayContribution", mTermMaxRayContribution);
79	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.minAccRayLenght", mTermMinAccRayLength);
80	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.maxCostRatio", mTermMaxCostRatio);
81	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.missTolerance", mTermMissTolerance);
82	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.maxViewCells", mMaxViewCells);
83
84	//-- max cost ratio for early tree termination
85	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.maxCostRatio", mTermMaxCostRatio);
86
87	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
88	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
89
90	// HACK//mTermMinPolygons = 25;
91
92	//-- factors for bsp tree split plane heuristics
93	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Factor.pvs", mPvsFactor);
94	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.ct_div_ci", mCtDivCi);
95
96
97	//-- partition criteria
98	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.maxPolyCandidates", mMaxPolyCandidates);
99	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.maxRayCandidates", mMaxRayCandidates);
100	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.splitPlaneStrategy", mSplitPlaneStrategy);
101
102	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Construction.epsilon", mEpsilon);
103	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.maxTests", mMaxTests);
104
105	// if only the driving axis is used for axis aligned split
106	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
107
108	//-- termination criteria for axis aligned split
109	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Termination.AxisAligned.maxRayContribution",
110	mTermMaxRayContriForAxisAligned);
111	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.Termination.AxisAligned.minRays",
112	mTermMinRaysForAxisAligned);
113
114	//Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.maxTotalMemory", mMaxTotalMemory);
115	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.maxStaticMemory", mMaxMemory);
116
117	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Construction.renderCostWeight", mRenderCostWeight);
118	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
119
120	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.useCostHeuristics", mUseCostHeuristics);
121	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.useSplitCostQueue", mUseSplitCostQueue);
122	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.simulateOctree", mCirculatingAxis);
123	Environment::GetSingleton()->GetBoolValue("FromPointVisibilityTree.useRandomAxis", mUseRandomAxis);
124	Environment::GetSingleton()->GetIntValue("FromPointVisibilityTree.nodePriorityQueueType", mNodePriorityQueueType);
125
126
127	char subdivisionStatsLog[100];
128	Environment::GetSingleton()->GetStringValue("FromPointVisibilityTree.subdivisionStats", subdivisionStatsLog);
129	mSubdivisionStats.open(subdivisionStatsLog);
130
131	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Construction.minBand", mMinBand);
132	Environment::GetSingleton()->GetFloatValue("FromPointVisibilityTree.Construction.maxBand", mMaxBand);
133
134	//-- debug output
135
136	Debug << "***** VSP BSP options ****** " << endl;
137	Debug << "max depth: " << mTermMaxDepth << endl;
138	Debug << "min PVS: " << mTermMinPvs << endl;
139	Debug << "min probabiliy: " << mTermMinProbability << endl;
140	Debug << "min rays: " << mTermMinRays << endl;
141	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
142	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
143	Debug << "miss tolerance: " << mTermMissTolerance << endl;
144	Debug << "max view cells: " << mMaxViewCells << endl;
145	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
146	//Debug << "max plane candidates: " << mMaxRayCandidates << endl;
147	Debug << "randomize: " << randomize << endl;
148
149	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
150	Debug << "render cost weight: " << mRenderCostWeight << endl;
151	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
152	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
153	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
154	Debug << "max memory: " << mMaxMemory << endl;
155	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
156	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
157	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
158	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
159	Debug << "use random axis: " << mUseRandomAxis << endl;
160	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
161
162	Debug << "octree: " << mCirculatingAxis << endl;
163	Debug << "minband: " << mMinBand << endl;
164	Debug << "maxband: " << mMaxBand << endl;
165
166
167	Debug << "Split plane strategy: ";
168
169	if (mSplitPlaneStrategy & RANDOM_POLYGON)
170	{
171	Debug << "random polygon ";
172	}
173	if (mSplitPlaneStrategy & AXIS_ALIGNED)
174	{
175	Debug << "axis aligned ";
176	}
177	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
178	{
179	mCostNormalizer += mLeastRaySplitsFactor;
180	Debug << "least ray splits ";
181	}
182	if (mSplitPlaneStrategy & BALANCED_RAYS)
183	{
184	mCostNormalizer += mBalancedRaysFactor;
185	Debug << "balanced rays ";
186	}
187	if (mSplitPlaneStrategy & PVS)
188	{
189	mCostNormalizer += mPvsFactor;
190	Debug << "pvs";
191	}
192
193
194	mSplitCandidates = new vector<SortableEntry>;
195
196	Debug << endl;
197	}
198
199
200	BspViewCell *FromPointVisibilityTree::GetOutOfBoundsCell()
201	{
202	return mOutOfBoundsCell;
203	}
204
205
206	BspViewCell *FromPointVisibilityTree::GetOrCreateOutOfBoundsCell()
207	{
208	if (!mOutOfBoundsCell)
209	{
210	mOutOfBoundsCell = new BspViewCell();
211	mOutOfBoundsCell->SetId(-1);
212	mOutOfBoundsCell->SetValid(false);
213	}
214
215	return mOutOfBoundsCell;
216	}
217
218
219	const BspTreeStatistics &FromPointVisibilityTree::GetStatistics() const
220	{
221	return mBspStats;
222	}
223
224
225	FromPointVisibilityTree::~FromPointVisibilityTree()
226	{
227	DEL_PTR(mRoot);
228	DEL_PTR(mSplitCandidates);
229	}
230
231
232	int FromPointVisibilityTree::AddMeshToPolygons(Mesh *mesh,
233	PolygonContainer &polys,
234	MeshInstance *parent)
235	{
236	FaceContainer::const_iterator fi;
237
238	// copy the face data to polygons
239	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
240	{
241	Polygon3 poly = new Polygon3((fi), mesh);
242
243	if (poly->Valid(mEpsilon))
244	{
245	poly->mParent = parent; // set parent intersectable
246	polys.push_back(poly);
247	}
248	else
249	DEL_PTR(poly);
250	}
251	return (int)mesh->mFaces.size();
252	}
253
254
255	int FromPointVisibilityTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
256	PolygonContainer &polys,
257	int maxObjects)
258	{
259	int limit = (maxObjects > 0) ?
260	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
261
262	int polysSize = 0;
263
264	for (int i = 0; i < limit; ++ i)
265	{
266	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
267	{
268	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
269	polysSize +=
270	AddMeshToPolygons(viewCells[i]->GetMesh(),
271	polys,
272	viewCells[i]);
273	}
274	}
275
276	return polysSize;
277	}
278
279
280	int FromPointVisibilityTree::AddToPolygonSoup(const ObjectContainer &objects,
281	PolygonContainer &polys,
282	int maxObjects)
283	{
284	int limit = (maxObjects > 0) ?
285	Min((int)objects.size(), maxObjects) : (int)objects.size();
286
287	for (int i = 0; i < limit; ++i)
288	{
289	Intersectable *object = objects[i];
290	Mesh *mesh = NULL;
291
292	switch (object->Type()) // extract the meshes
293	{
294	case Intersectable::MESH_INSTANCE:
295	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
296	break;
297	case Intersectable::VIEW_CELL:
298	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
299	break;
300	case Intersectable::TRANSFORMED_MESH_INSTANCE:
301	{
302	TransformedMeshInstance *mi =
303	dynamic_cast<TransformedMeshInstance *>(object);
304
305	if (!mi->GetMesh())
306	break;
307	mesh = new Mesh();
308	mi->GetTransformedMesh(*mesh);
309
310	break;
311	}
312	default:
313	Debug << "intersectable type not supported" << endl;
314	break;
315	}
316
317	if (mesh) // copy the mesh data to polygons
318	{
319	mBox.Include(object->GetBox()); // add to BSP tree aabb
320	AddMeshToPolygons(mesh, polys, NULL);
321
322	// cleanup
323	if (object->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
324	DEL_PTR(mesh);
325	}
326	}
327
328	return (int)polys.size();
329	}
330
331
332	void FromPointVisibilityTree::Construct(const VssRayContainer &sampleRays,
333	AxisAlignedBox3 *forcedBoundingBox)
334	{
335	mBspStats.nodes = 1;
336	mBox.Initialize(); // initialise BSP tree bounding box
337
338	if (forcedBoundingBox)
339	mBox = *forcedBoundingBox;
340
341	PolygonContainer polys;
342	RayInfoContainer *rays = new RayInfoContainer();
343
344	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
345
346	long startTime = GetTime();
347
348	cout << "Extracting polygons from rays ... ";
349
350	Intersectable::NewMail();
351
352	int numObj = 0;
353
354	//-- extract polygons intersected by the rays
355	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
356	{
357	VssRay ray = rit;
358	Intersectable *obj = ray->mTerminationObject;
359
360	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
361	obj && !obj->Mailed())
362	{
363	obj->Mail();
364
365	// transformed mesh instance and mesh instance handle mesh differently
366	if (obj->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
367	{
368	Mesh mesh;
369
370	TransformedMeshInstance *tmobj =
371	dynamic_cast<TransformedMeshInstance *>(obj);
372
373	tmobj->GetTransformedMesh(mesh);
374	AddMeshToPolygons(&mesh, polys, tmobj);
375	}
376	else // MeshInstance
377	{
378	MeshInstance mobj = dynamic_cast<MeshInstance >(obj);
379	AddMeshToPolygons(mobj->GetMesh(), polys, mobj);
380	}
381
382	//-- compute bounding box
383	if (!forcedBoundingBox)
384	mBox.Include(ray->mTermination);
385	}
386
387	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
388	ray->mOriginObject &&
389	!ray->mOriginObject->Mailed())
390	{
391	ray->mOriginObject->Mail();
392	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
393	AddMeshToPolygons(obj->GetMesh(), polys, obj);
394	++ numObj;
395
396	//-- compute bounding box
397	if (!forcedBoundingBox)
398	mBox.Include(ray->mOrigin);
399	}
400	}
401
402	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
403	<< mViewCellsManager->GetMaxPvsSize() << endl;
404
405	//-- store rays
406	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
407	{
408	VssRay ray = rit;
409
410	float minT, maxT;
411
412	static Ray hray;
413	hray.Init(*ray);
414
415	// TODO: not very efficient to implictly cast between rays types
416	if (mBox.GetRaySegment(hray, minT, maxT))
417	{
418	float len = ray->Length();
419
420	if (!len)
421	len = Limits::Small;
422
423	rays->push_back(RayInfo(ray, minT / len, maxT / len));
424	}
425	}
426
427	// normalize
428	if (mUseAreaForPvs)
429	mTermMinProbability *= mBox.SurfaceArea();
430	else
431	mTermMinProbability *= mBox.GetVolume();
432
433	// throw out unnecessary polygons
434	PreprocessPolygons(polys);
435
436	mBspStats.polys = (int)polys.size();
437	mGlobalCostMisses = 0;
438
439	cout << "finished" << endl;
440
441	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
442	<< (int)sampleRays.size() << " rays in "
443	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
444
445	// use split cost priority queue
446	if (mUseSplitCostQueue)
447	{
448	ConstructWithSplitQueue(polys, rays);
449	}
450	else
451	{
452	Construct(polys, rays);
453	}
454
455	// clean up polygons
456	CLEAR_CONTAINER(polys);
457	}
458
459
460	// TODO: return memory usage in MB
461	float FromPointVisibilityTree::GetMemUsage() const
462	{
463	return (float)
464	(sizeof(FromPointVisibilityTree) +
465	mBspStats.Leaves() * sizeof(BspLeaf) +
466	mCreatedViewCells * sizeof(BspViewCell) +
467	mBspStats.pvs * sizeof(ObjectPvsData) +
468	mBspStats.Interior() * sizeof(BspInterior) +
469	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
470	}
471
472
473
474	void FromPointVisibilityTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
475	{
476	VspBspTraversalQueue tQueue;
477
478	mRoot = new BspLeaf();
479
480	// constrruct root node geometry
481	BspNodeGeometry *geom = new BspNodeGeometry();
482	ConstructGeometry(mRoot, *geom);
483
484	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
485
486	VspBspTraversalData tData(mRoot,
487	new PolygonContainer(polys),
488	0,
489	rays,
490	ComputePvsSize(*rays),
491	prop,
492	geom);
493
494	EvalPriority(tData);
495
496
497	// first node is kd node, i.e. an axis aligned box
498	if (1)
499	tData.mIsKdNode = true;
500	else
501	tData.mIsKdNode = false;
502
503	tQueue.push(tData);
504
505
506	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
507	mTotalPvsSize = tData.mPvs;
508
509	// -- first stat
510	mSubdivisionStats
511	<< "#ViewCells\n1" << endl
512	<< "#RenderCostDecrease\n0" << endl
513	<< "#TotalRenderCost\n" << mTotalCost << endl
514	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
515
516	Debug << "total cost: " << mTotalCost << endl;
517
518
519	mBspStats.Start();
520	cout << "Constructing vsp bsp tree ... \n";
521
522	long startTime = GetTime();
523	int nLeaves = 500;
524	int nViewCells = 500;
525
526	// used for intermediate time measurements and progress
527	long interTime = GetTime();
528
529	mOutOfMemory = false;
530
531	mCreatedViewCells = 0;
532
533	while (!tQueue.empty())
534	{
535	tData = tQueue.top();
536	tQueue.pop();
537
538	if (0 && !mOutOfMemory)
539	{
540	float mem = GetMemUsage();
541
542	if (mem > mMaxMemory)
543	{
544	mOutOfMemory = true;
545	Debug << "memory limit reached: " << mem << endl;
546	}
547	}
548
549	// subdivide leaf node
550	BspNode *r = Subdivide(tQueue, tData);
551
552	if (r == mRoot)
553	Debug << "VSP BSP tree construction time spent at root: "
554	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
555
556	if (mBspStats.Leaves() >= nLeaves)
557	{
558	nLeaves += 500;
559
560	cout << "leaves=" << mBspStats.Leaves() << endl;
561	Debug << "needed "
562	<< TimeDiff(interTime, GetTime())*1e-3
563	<< " secs to create 500 view cells" << endl;
564	interTime = GetTime();
565	}
566
567	if (mCreatedViewCells >= nViewCells)
568	{
569	nViewCells += 500;
570
571	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
572	}
573	}
574
575	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
576	cout << "finished\n";
577
578	mBspStats.Stop();
579	}
580
581
582
583	void FromPointVisibilityTree::ConstructWithSplitQueue(const PolygonContainer &polys,
584	RayInfoContainer *rays)
585	{
586	VspBspSplitQueue tQueue;
587
588	mRoot = new BspLeaf();
589
590	// constrruct root node geometry
591	BspNodeGeometry *geom = new BspNodeGeometry();
592	ConstructGeometry(mRoot, *geom);
593
594	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
595
596	VspBspTraversalData tData(mRoot,
597	new PolygonContainer(polys),
598	0,
599	rays,
600	ComputePvsSize(*rays),
601	prop,
602	geom);
603
604
605	// compute first split candidate
606	VspBspSplitCandidate splitCandidate;
607	EvalSplitCandidate(tData, splitCandidate);
608
609	tQueue.push(splitCandidate);
610
611	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
612	mTotalPvsSize = tData.mPvs;
613
614	mSubdivisionStats
615	<< "#ViewCells\n1\n" << endl
616	<< "#RenderCostDecrease\n0\n" << endl
617	<< "#SplitCandidateCost\n0\n" << endl
618	<< "#TotalRenderCost\n" << mTotalCost << endl
619	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
620
621	Debug << "total cost: " << mTotalCost << endl;
622
623
624	mBspStats.Start();
625	cout << "Constructing vsp bsp tree ... \n";
626
627	long startTime = GetTime();
628	int nLeaves = 500;
629	int nViewCells = 500;
630
631	// used for intermediate time measurements and progress
632	long interTime = GetTime();
633
634	mOutOfMemory = false;
635
636	mCreatedViewCells = 0;
637
638	while (!tQueue.empty())
639	{
640	splitCandidate = tQueue.top();
641	tQueue.pop();
642
643	// cost ratio of cost decrease / totalCost
644	float costRatio = splitCandidate.GetCost() / mTotalCost;
645
646	//Debug << "cost ratio: " << costRatio << endl;
647
648	if (costRatio < mTermMinGlobalCostRatio)
649	++ mGlobalCostMisses;
650
651	if (0 && !mOutOfMemory)
652	{
653	float mem = GetMemUsage();
654
655	if (mem > mMaxMemory)
656	{
657	mOutOfMemory = true;
658	Debug << "memory limit reached: " << mem << endl;
659	}
660	}
661
662	// subdivide leaf node
663	BspNode *r = Subdivide(tQueue, splitCandidate);
664
665	if (r == mRoot)
666	Debug << "VSP BSP tree construction time spent at root: "
667	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
668
669	if (mBspStats.Leaves() >= nLeaves)
670	{
671	nLeaves += 500;
672
673	cout << "leaves=" << mBspStats.Leaves() << endl;
674	Debug << "needed "
675	<< TimeDiff(interTime, GetTime())*1e-3
676	<< " secs to create 500 view cells" << endl;
677	interTime = GetTime();
678	}
679
680	if (mCreatedViewCells == nViewCells)
681	{
682	nViewCells += 500;
683
684	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
685	}
686	}
687
688	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
689	cout << "finished\n";
690
691	mBspStats.Stop();
692	}
693
694
695	bool FromPointVisibilityTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
696	{
697	return
698	(((int)data.mRays->size() <= mTermMinRays) \|\|
699	(data.mPvs <= mTermMinPvs) \|\|
700	(data.mProbability <= mTermMinProbability) \|\|
701	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
702	(data.mDepth >= mTermMaxDepth));
703	}
704
705
706	bool FromPointVisibilityTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
707	{
708	return
709	(mOutOfMemory
710	\|\| (mBspStats.Leaves() >= mMaxViewCells)
711	\|\| (mGlobalCostMisses >= mTermGlobalCostMissTolerance)
712	);
713	}
714
715
716
717	BspNode *FromPointVisibilityTree::Subdivide(VspBspTraversalQueue &tQueue,
718	VspBspTraversalData &tData)
719	{
720	BspNode *newNode = tData.mNode;
721
722	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
723	{
724	PolygonContainer coincident;
725
726	VspBspTraversalData tFrontData;
727	VspBspTraversalData tBackData;
728
729	// create new interior node and two leaf nodes
730	// or return leaf as it is (if maxCostRatio missed)
731	int splitAxis;
732	bool splitFurther = true;
733	int maxCostMisses = tData.mMaxCostMisses;
734
735	Plane3 splitPlane;
736	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
737
738	// choose next split plane
739	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
740	{
741	++ maxCostMisses;
742
743	if (maxCostMisses > mTermMissTolerance)
744	{
745	// terminate branch because of max cost
746	++ mBspStats.maxCostNodes;
747	splitFurther = false;
748	}
749	}
750
751	// if this a valid split => subdivide this node further
752	if (splitFurther) //-- continue subdivision
753	{
754	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
755
756	if (splitAxis < 3)
757	++ mBspStats.splits[splitAxis];
758	else
759	++ mBspStats.polySplits;
760
761	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
762	tFrontData.mAxis = tBackData.mAxis = splitAxis;
763
764	// how often was max cost ratio missed in this branch?
765	tFrontData.mMaxCostMisses = maxCostMisses;
766	tBackData.mMaxCostMisses = maxCostMisses;
767
768	EvalPriority(tFrontData);
769	EvalPriority(tBackData);
770
771	// evaluate subdivision stats
772	if (1)
773	{
774	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
775	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
776	float cData = (float)tData.mPvs * tData.mProbability;;
777
778	float costDecr = (cFront + cBack - cData) / mBox.GetVolume();
779
780	mTotalCost += costDecr;
781	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
782
783	mSubdivisionStats
784	<< "#ViewCells\n" << mBspStats.Leaves() << endl
785	<< "#RenderCostDecrease\n" << -costDecr << endl
786	<< "#TotalRenderCost\n" << mTotalCost << endl
787	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
788	}
789
790	// push the children on the stack
791	tQueue.push(tFrontData);
792	tQueue.push(tBackData);
793
794	// delete old leaf node
795	DEL_PTR(tData.mNode);
796	}
797	}
798
799	//-- terminate traversal and create new view cell
800	if (newNode->IsLeaf())
801	{
802	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
803	BspViewCell *viewCell = new BspViewCell();
804
805	leaf->SetViewCell(viewCell);
806
807	//-- update pvs
808	int conSamp = 0;
809	float sampCon = 0.0f;
810	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
811
812	// update single pvs parameter
813	mViewCellsManager->SetScalarPvsSize(viewCell, viewCell->GetPvs().GetSize());
814
815
816	mBspStats.contributingSamples += conSamp;
817	mBspStats.sampleContributions +=(int) sampCon;
818
819	//-- store additional info
820	if (mStoreRays)
821	{
822	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
823	for (it = tData.mRays->begin(); it != it_end; ++ it)
824	{
825	(*it).mRay->Ref();
826	leaf->mVssRays.push_back((*it).mRay);
827	}
828	}
829
830	// should I check here?
831	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0, mViewCellsManager->GetMaxPvsSize()))
832	{
833	viewCell->SetValid(false);
834	leaf->SetTreeValid(false);
835	PropagateUpValidity(leaf);
836
837	++ mBspStats.invalidLeaves;
838	}
839
840	viewCell->mLeaf = leaf;
841
842	if (mUseAreaForPvs)
843	viewCell->SetArea(tData.mProbability);
844	else
845	viewCell->SetVolume(tData.mProbability);
846
847	leaf->mProbability = tData.mProbability;
848
849	EvaluateLeafStats(tData);
850	}
851
852	//-- cleanup
853	tData.Clear();
854
855	return newNode;
856	}
857
858	// subdivide using a split plane queue
859	BspNode *FromPointVisibilityTree::Subdivide(VspBspSplitQueue &tQueue,
860	VspBspSplitCandidate &splitCandidate)
861	{
862	VspBspTraversalData &tData = splitCandidate.mParentData;
863
864	BspNode *newNode = tData.mNode;
865
866	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
867	{
868	PolygonContainer coincident;
869
870	VspBspTraversalData tFrontData;
871	VspBspTraversalData tBackData;
872
873	//-- continue subdivision
874
875	// create new interior node and two leaf node
876	const Plane3 splitPlane = splitCandidate.mSplitPlane;
877
878	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
879
880	const int splitAxis = splitCandidate.mSplitAxis;
881	const int maxCostMisses = splitCandidate.mMaxCostMisses;
882
883	if (splitAxis < 3)
884	++ mBspStats.splits[splitAxis];
885	else
886	++ mBspStats.polySplits;
887
888	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
889	tFrontData.mAxis = tBackData.mAxis = splitAxis;
890
891	// how often was max cost ratio missed in this branch?
892	tFrontData.mMaxCostMisses = maxCostMisses;
893	tBackData.mMaxCostMisses = maxCostMisses;
894
895
896	if (1)
897	{
898	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
899	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
900	float cData = (float)tData.mPvs * tData.mProbability;
901
902
903	float costDecr =
904	(cFront + cBack - cData) / mBox.GetVolume();
905
906	mTotalCost += costDecr;
907	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
908
909	mSubdivisionStats
910	<< "#ViewCells\n" << mBspStats.Leaves() << endl
911	<< "#RenderCostDecrease\n" << -costDecr << endl
912	<< "#SplitCandidateCost\n" << splitCandidate.GetCost() << endl
913	<< "#TotalRenderCost\n" << mTotalCost << endl
914	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
915	}
916
917
918	//-- push the new split candidates on the stack
919	VspBspSplitCandidate frontCandidate;
920	VspBspSplitCandidate backCandidate;
921
922	EvalSplitCandidate(tFrontData, frontCandidate);
923	EvalSplitCandidate(tBackData, backCandidate);
924
925	tQueue.push(frontCandidate);
926	tQueue.push(backCandidate);
927
928	// delete old leaf node
929	DEL_PTR(tData.mNode);
930	}
931
932
933	//-- terminate traversal and create new view cell
934	if (newNode->IsLeaf())
935	{
936	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
937	BspViewCell *viewCell = new BspViewCell();
938
939	leaf->SetViewCell(viewCell);
940
941	//-- update pvs
942	int conSamp = 0;
943	float sampCon = 0.0f;
944	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
945
946	mViewCellsManager->SetScalarPvsSize(viewCell, viewCell->GetPvs().GetSize());
947
948	mBspStats.contributingSamples += conSamp;
949	mBspStats.sampleContributions +=(int) sampCon;
950
951	//-- store additional info
952	if (mStoreRays)
953	{
954	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
955	for (it = tData.mRays->begin(); it != it_end; ++ it)
956	{
957	(*it).mRay->Ref();
958	leaf->mVssRays.push_back((*it).mRay);
959	}
960	}
961
962	// should I check here?
963	viewCell->mLeaf = leaf;
964
965	if (mUseAreaForPvs)
966	viewCell->SetArea(tData.mProbability);
967	else
968	viewCell->SetVolume(tData.mProbability);
969
970	leaf->mProbability = tData.mProbability;
971
972	EvaluateLeafStats(tData);
973	}
974
975	//-- cleanup
976	tData.Clear();
977
978	return newNode;
979	}
980
981
982	void FromPointVisibilityTree::EvalPriority(VspBspTraversalData &tData) const
983	{
984	switch (mNodePriorityQueueType)
985	{
986	case BREATH_FIRST:
987	tData.mPriority = (float)-tData.mDepth;
988	break;
989	case DEPTH_FIRST:
990	tData.mPriority = (float)tData.mDepth;
991	break;
992	default:
993	tData.mPriority = tData.mPvs * tData.mProbability;
994	//Debug << "priority: " << tData.mPriority << endl;
995	break;
996	}
997	}
998
999
1000	void FromPointVisibilityTree::EvalSplitCandidate(VspBspTraversalData &tData,
1001	VspBspSplitCandidate &splitData)
1002	{
1003	VspBspTraversalData frontData;
1004	VspBspTraversalData backData;
1005
1006	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
1007
1008	// compute locally best split plane
1009	bool success = SelectPlane(splitData.mSplitPlane, leaf, tData,
1010	frontData, backData, splitData.mSplitAxis);
1011
1012	// TODO: reuse
1013	DEL_PTR(frontData.mGeometry);
1014	DEL_PTR(backData.mGeometry);
1015
1016	// compute global decrease in render cost
1017	splitData.mRenderCost = EvalRenderCostDecrease(splitData.mSplitPlane, tData);
1018	splitData.mParentData = tData;
1019	splitData.mMaxCostMisses = success ? tData.mMaxCostMisses : tData.mMaxCostMisses + 1;
1020	}
1021
1022
1023	BspInterior *FromPointVisibilityTree::SubdivideNode(const Plane3 &splitPlane,
1024	VspBspTraversalData &tData,
1025	VspBspTraversalData &frontData,
1026	VspBspTraversalData &backData,
1027	PolygonContainer &coincident)
1028	{
1029	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
1030
1031	//-- the front and back traversal data is filled with the new values
1032	frontData.mDepth = tData.mDepth + 1;
1033	frontData.mPolygons = new PolygonContainer();
1034	frontData.mRays = new RayInfoContainer();
1035
1036	backData.mDepth = tData.mDepth + 1;
1037	backData.mPolygons = new PolygonContainer();
1038	backData.mRays = new RayInfoContainer();
1039
1040
1041	//-- subdivide rays
1042	SplitRays(splitPlane,
1043	*tData.mRays,
1044	*frontData.mRays,
1045	*backData.mRays);
1046
1047
1048	// compute pvs
1049	frontData.mPvs = ComputePvsSize(*frontData.mRays);
1050	backData.mPvs = ComputePvsSize(*backData.mRays);
1051
1052	// split front and back node geometry and compute area
1053
1054	// if geometry was not already computed
1055	if (!frontData.mGeometry && !backData.mGeometry)
1056	{
1057	frontData.mGeometry = new BspNodeGeometry();
1058	backData.mGeometry = new BspNodeGeometry();
1059
1060	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
1061	*backData.mGeometry,
1062	splitPlane,
1063	mBox,
1064	//0.0f);
1065	mEpsilon);
1066
1067	if (mUseAreaForPvs)
1068	{
1069	frontData.mProbability = frontData.mGeometry->GetArea();
1070	backData.mProbability = backData.mGeometry->GetArea();
1071	}
1072	else
1073	{
1074	frontData.mProbability = frontData.mGeometry->GetVolume();
1075	backData.mProbability = tData.mProbability - frontData.mProbability;
1076
1077	// should never come here: wrong volume !!!
1078	if (0)
1079	{
1080	if (frontData.mProbability < -0.00001)
1081	Debug << "fatal error f: " << frontData.mProbability << endl;
1082	if (backData.mProbability < -0.00001)
1083	Debug << "fatal error b: " << backData.mProbability << endl;
1084
1085	// clamp because of precision issues
1086	if (frontData.mProbability < 0) frontData.mProbability = 0;
1087	if (backData.mProbability < 0) backData.mProbability = 0;
1088	}
1089	}
1090	}
1091
1092
1093	// subdivide polygons
1094	SplitPolygons(splitPlane,
1095	*tData.mPolygons,
1096	*frontData.mPolygons,
1097	*backData.mPolygons,
1098	coincident);
1099
1100
1101
1102	///////////////////////////////////////
1103	// subdivide further
1104
1105	// store maximal and minimal depth
1106	if (tData.mDepth > mBspStats.maxDepth)
1107	{
1108	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
1109	mBspStats.maxDepth = tData.mDepth;
1110	}
1111
1112	mBspStats.nodes += 2;
1113
1114
1115	BspInterior *interior = new BspInterior(splitPlane);
1116
1117	#ifdef _DEBUG
1118	Debug << interior << endl;
1119	#endif
1120
1121
1122	//-- create front and back leaf
1123
1124	BspInterior *parent = leaf->GetParent();
1125
1126	// replace a link from node's parent
1127	if (parent)
1128	{
1129	parent->ReplaceChildLink(leaf, interior);
1130	interior->SetParent(parent);
1131	}
1132	else // new root
1133	{
1134	mRoot = interior;
1135	}
1136
1137	// and setup child links
1138	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
1139
1140	frontData.mNode = interior->GetFront();
1141	backData.mNode = interior->GetBack();
1142
1143	interior->mTimeStamp = mTimeStamp ++;
1144
1145
1146	//DEL_PTR(leaf);
1147	return interior;
1148	}
1149
1150
1151	void FromPointVisibilityTree::Construct(const VisibilityPointsContainer &visibilityPoints,
1152	AxisAlignedBox3 *forcedBoundingBox)
1153	{
1154	/*mBspStats.nodes = 1;
1155	mBox.Initialize(); // initialise BSP tree bounding box
1156
1157	if (forcedBoundingBox)
1158	mBox = *forcedBoundingBox;
1159
1160	PolygonContainer polys;
1161	RayInfoContainer *rays = new RayInfoContainer();
1162
1163	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
1164
1165	long startTime = GetTime();
1166
1167	cout << "Extracting polygons from rays ... ";
1168
1169	Intersectable::NewMail();
1170
1171	int numObj = 0;
1172
1173	//-- extract polygons intersected by the rays
1174	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
1175	{
1176	VssRay ray = rit;
1177
1178	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
1179	ray->mTerminationObject &&
1180	!ray->mTerminationObject->Mailed())
1181	{
1182	ray->mTerminationObject->Mail();
1183	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
1184	AddMeshToPolygons(obj->GetMesh(), polys, obj);
1185	++ numObj;
1186
1187	//-- compute bounding box
1188	if (!forcedBoundingBox)
1189	mBox.Include(ray->mTermination);
1190	}
1191
1192	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
1193	ray->mOriginObject &&
1194	!ray->mOriginObject->Mailed())
1195	{
1196	ray->mOriginObject->Mail();
1197	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
1198	AddMeshToPolygons(obj->GetMesh(), polys, obj);
1199	++ numObj;
1200
1201	//-- compute bounding box
1202	if (!forcedBoundingBox)
1203	mBox.Include(ray->mOrigin);
1204	}
1205	}
1206
1207	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
1208	<< mViewCellsManager->GetMaxPvsSize() << endl;
1209
1210	//-- store rays
1211	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
1212	{
1213	VssRay ray = rit;
1214
1215	float minT, maxT;
1216
1217	static Ray hray;
1218	hray.Init(*ray);
1219
1220	// TODO: not very efficient to implictly cast between rays types
1221	if (mBox.GetRaySegment(hray, minT, maxT))
1222	{
1223	float len = ray->Length();
1224
1225	if (!len)
1226	len = Limits::Small;
1227
1228	rays->push_back(RayInfo(ray, minT / len, maxT / len));
1229	}
1230	}
1231
1232	// normalize
1233	if (mUseAreaForPvs)
1234	mTermMinProbability *= mBox.SurfaceArea();
1235	else
1236	mTermMinProbability *= mBox.GetVolume();
1237
1238	// throw out unnecessary polygons
1239	PreprocessPolygons(polys);
1240
1241	mBspStats.polys = (int)polys.size();
1242	mGlobalCostMisses = 0;
1243
1244	cout << "finished" << endl;
1245
1246	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
1247	<< (int)sampleRays.size() << " rays in "
1248	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
1249
1250	// use split cost priority queue
1251	if (mUseSplitCostQueue)
1252	{
1253	ConstructWithSplitQueue(polys, rays);
1254	}
1255	else
1256	{
1257	Construct(polys, rays);
1258	}
1259
1260	// clean up polygons
1261	CLEAR_CONTAINER(polys);
1262	*/
1263	}
1264
1265
1266
1267	void FromPointVisibilityTree::AddToPvs(BspLeaf *leaf,
1268	const RayInfoContainer &rays,
1269	float &sampleContributions,
1270	int &contributingSamples)
1271	{
1272	sampleContributions = 0;
1273	contributingSamples = 0;
1274
1275
1276	RayInfoContainer::const_iterator it, it_end = rays.end();
1277	ViewCell *vc = leaf->GetViewCell();
1278
1279	// add contributions from samples to the PVS
1280	for (it = rays.begin(); it != it_end; ++ it)
1281	{
1282	float sc = 0.0f;
1283
1284	VssRay ray = (it).mRay;
1285
1286	bool madeContrib = false;
1287	float contribution;
1288
1289	if (ray->mTerminationObject)
1290	{
1291	if (vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf, contribution))
1292	madeContrib = true;
1293	sc += contribution;
1294	}
1295
1296	if (ray->mOriginObject)
1297	{
1298	if (vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf, contribution))
1299	madeContrib = true;
1300	sc += contribution;
1301	}
1302
1303	sampleContributions += sc;
1304	if (madeContrib)
1305	++ contributingSamples;
1306
1307	//leaf->mVssRays.push_back(ray);
1308	}
1309	}
1310
1311
1312	void FromPointVisibilityTree::SortSplitCandidates(const RayInfoContainer &rays,
1313	const int axis,
1314	float minBand,
1315	float maxBand)
1316	{
1317	mSplitCandidates->clear();
1318
1319	int requestedSize = 2 * (int)(rays.size());
1320	// creates a sorted split candidates array
1321	if (mSplitCandidates->capacity() > 500000 &&
1322	requestedSize < (int)(mSplitCandidates->capacity() / 10) )
1323	{
1324	delete mSplitCandidates;
1325	mSplitCandidates = new vector<SortableEntry>;
1326	}
1327
1328	mSplitCandidates->reserve(requestedSize);
1329
1330	float pos;
1331
1332	// float values => don't compare with exact values
1333	if (0)
1334	{
1335	minBand += Limits::Small;
1336	maxBand -= Limits::Small;
1337	}
1338
1339	// insert all queries
1340	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
1341	{
1342	const bool positive = (*ri).mRay->HasPosDir(axis);
1343
1344	pos = (*ri).ExtrapOrigin(axis);
1345	// clamp to min / max band
1346	if (0) ClipValue(pos, minBand, maxBand);
1347
1348	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
1349	pos, (*ri).mRay));
1350
1351	pos = (*ri).ExtrapTermination(axis);
1352	// clamp to min / max band
1353	if (0) ClipValue(pos, minBand, maxBand);
1354
1355	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
1356	pos, (*ri).mRay));
1357	}
1358
1359	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
1360	}
1361
1362
1363	float FromPointVisibilityTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
1364	const AxisAlignedBox3 &box,
1365	const int pvsSize,
1366	const int axis,
1367	float &position)
1368	{
1369	const float minBox = box.Min(axis);
1370	const float maxBox = box.Max(axis);
1371	const float sizeBox = maxBox - minBox;
1372
1373	const float minBand = minBox + mMinBand * sizeBox;
1374	const float maxBand = minBox + mMaxBand * sizeBox;
1375
1376	SortSplitCandidates(rays, axis, minBand, maxBand);
1377
1378	// go through the lists, count the number of objects left and right
1379	// and evaluate the following cost funcion:
1380	// C = ct_div_ci + (qlrl + qrrr)/queries
1381
1382	int pvsl = 0;
1383	int pvsr = pvsSize;
1384
1385	int pvsBack = pvsl;
1386	int pvsFront = pvsr;
1387
1388	float sum = (float)pvsSize * sizeBox;
1389	float minSum = 1e20f;
1390
1391	// if no border can be found, take mid split
1392	position = minBox + 0.5f * sizeBox;
1393
1394	Intersectable::NewMail();
1395
1396	RayInfoContainer::const_iterator ri, ri_end = rays.end();
1397
1398	// set all object as belonging to the front pvs
1399	for(ri = rays.begin(); ri != ri_end; ++ ri)
1400	{
1401	Intersectable oObject = (ri).mRay->mOriginObject;
1402	Intersectable tObject = (ri).mRay->mTerminationObject;
1403
1404	if (oObject)
1405	{
1406	if (!oObject->Mailed())
1407	{
1408	oObject->Mail();
1409	oObject->mCounter = 1;
1410	}
1411	else
1412	{
1413	++ oObject->mCounter;
1414	}
1415	}
1416	if (tObject)
1417	{
1418	if (!tObject->Mailed())
1419	{
1420	tObject->Mail();
1421	tObject->mCounter = 1;
1422	}
1423	else
1424	{
1425	++ tObject->mCounter;
1426	}
1427	}
1428	}
1429
1430	Intersectable::NewMail();
1431
1432	vector<SortableEntry>::const_iterator ci, ci_end = mSplitCandidates->end();
1433
1434	for (ci = mSplitCandidates->begin(); ci < ci_end; ++ ci)
1435	{
1436	VssRay *ray;
1437	ray = (*ci).ray;
1438
1439	Intersectable *oObject = ray->mOriginObject;
1440	Intersectable *tObject = ray->mTerminationObject;
1441
1442
1443	switch ((*ci).type)
1444	{
1445	case SortableEntry::ERayMin:
1446	{
1447	if (oObject && !oObject->Mailed())
1448	{
1449	oObject->Mail();
1450	++ pvsl;
1451	}
1452	if (tObject && !tObject->Mailed())
1453	{
1454	tObject->Mail();
1455	++ pvsl;
1456	}
1457	break;
1458	}
1459	case SortableEntry::ERayMax:
1460	{
1461	if (oObject)
1462	{
1463	if (-- oObject->mCounter == 0)
1464	-- pvsr;
1465	}
1466
1467	if (tObject)
1468	{
1469	if (-- tObject->mCounter == 0)
1470	-- pvsr;
1471	}
1472
1473	break;
1474	}
1475	}
1476
1477	// Note: sufficient to compare size of bounding boxes of front and back side?
1478	if (((ci).value >= minBand) && ((ci).value <= maxBand))
1479	{
1480	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
1481
1482	//cout << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
1483	//cout<<"cost= "<<sum<<endl;
1484
1485	if (sum < minSum)
1486	{
1487	minSum = sum;
1488	position = (*ci).value;
1489
1490	pvsBack = pvsl;
1491	pvsFront = pvsr;
1492	}
1493	}
1494	}
1495
1496	Debug << "pos: " << position << " sizebox: " << sizeBox << " pvs: " << pvsSize << endl;
1497
1498	// -- compute cost
1499	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1500	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1501
1502	const float pOverall = sizeBox;
1503
1504	const float pBack = position - minBox;
1505	const float pFront = maxBox - position;
1506
1507	const float penaltyOld = EvalPvsPenalty(pvsSize, lowerPvsLimit, upperPvsLimit);
1508	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1509	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1510
1511	const float oldRenderCost = penaltyOld * pOverall;
1512	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1513
1514	float ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
1515
1516	//Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
1517	// <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
1518
1519	return ratio;
1520	}
1521
1522
1523	float FromPointVisibilityTree::SelectAxisAlignedPlane(Plane3 &plane,
1524	const VspBspTraversalData &tData,
1525	int &axis,
1526	BspNodeGeometry **frontGeom,
1527	BspNodeGeometry **backGeom,
1528	float &pFront,
1529	float &pBack,
1530	const bool isKdNode)
1531	{
1532	float nPosition[3];
1533	float nCostRatio[3];
1534	float nProbFront[3];
1535	float nProbBack[3];
1536
1537	BspNodeGeometry *nFrontGeom[3];
1538	BspNodeGeometry *nBackGeom[3];
1539
1540	for (int i = 0; i < 3; ++ i)
1541	{
1542	nFrontGeom[i] = NULL;
1543	nBackGeom[i] = NULL;
1544	}
1545
1546	int bestAxis = -1;
1547
1548	// create bounding box of node geometry
1549	AxisAlignedBox3 box;
1550
1551	//TODO: for kd split geometry already is box => only take minmax vertices
1552	if (1)
1553	{
1554	tData.mGeometry->GetBoundingBox(box);
1555	}
1556	else
1557	{
1558	box.Initialize();
1559	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1560
1561	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1562	box.Include((*ri).ExtrapTermination());
1563	}
1564
1565	int sAxis = 0;
1566	// hack : subdivide along driving axis up to certain depth
1567	int maxDepthForDrivingAxis = 0;
1568
1569	const bool useSpecialAxis = mOnlyDrivingAxis \|\| mUseRandomAxis \|\|
1570	mCirculatingAxis \|\| (tData.mDepth < maxDepthForDrivingAxis);
1571
1572
1573	// use some kind of specialised fixed axis
1574	if (mUseRandomAxis)
1575	sAxis = Random(3);
1576	else if (mCirculatingAxis)
1577	sAxis = (tData.mAxis + 1) % 3;
1578	else if (mOnlyDrivingAxis \|\| (tData.mDepth < maxDepthForDrivingAxis))
1579	sAxis = box.Size().DrivingAxis();
1580
1581
1582	//Debug << "use special axis: " << useSpecialAxis << endl;
1583	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
1584
1585	for (axis = 0; axis < 3; ++ axis)
1586	{
1587	if (!useSpecialAxis \|\| (axis == sAxis))
1588	{
1589	if (!mUseCostHeuristics)
1590	{
1591	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1592	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1593
1594	// allows faster split because we have axis aligned kd tree boxes
1595	if (1 && isKdNode)
1596	{
1597	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1598	box,
1599	axis,
1600	nPosition[axis],
1601	nProbFront[axis],
1602	nProbBack[axis]);
1603
1604	Vector3 pos;
1605
1606	// create back geometry from box
1607	pos = box.Max(); pos[axis] = nPosition[axis];
1608	AxisAlignedBox3 bBox(box.Min(), pos);
1609	PolygonContainer fPolys;
1610	bBox.ExtractPolys(fPolys);
1611
1612	nBackGeom[axis] = new BspNodeGeometry(fPolys);
1613
1614	// create front geometry from box
1615	pos = box.Min(); pos[axis] = nPosition[axis];
1616	AxisAlignedBox3 fBox(pos, box.Max());
1617
1618	PolygonContainer bPolys;
1619	fBox.ExtractPolys(bPolys);
1620	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
1621	}
1622	else
1623	{
1624	nFrontGeom[axis] = new BspNodeGeometry();
1625	nBackGeom[axis] = new BspNodeGeometry();
1626
1627	nCostRatio[axis] =
1628	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1629	tData, nFrontGeom[axis], nBackGeom[axis],
1630	nProbFront[axis], nProbBack[axis]);
1631	}
1632	}
1633	else
1634	{
1635
1636	nCostRatio[axis] =
1637	BestCostRatioHeuristics(*tData.mRays,
1638	box,
1639	tData.mPvs,
1640	axis,
1641	nPosition[axis]);
1642
1643
1644	}
1645
1646	if (bestAxis == -1)
1647	{
1648	bestAxis = axis;
1649	}
1650	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1651	{
1652	bestAxis = axis;
1653	}
1654
1655	}
1656	}
1657
1658	//-- assign values
1659	axis = bestAxis;
1660	pFront = nProbFront[bestAxis];
1661	pBack = nProbBack[bestAxis];
1662
1663	// assign best split nodes geometry
1664	*frontGeom = nFrontGeom[bestAxis];
1665	*backGeom = nBackGeom[bestAxis];
1666
1667	// and delete other geometry
1668	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1669	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1670
1671	//-- split plane
1672	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1673	plane = Plane3(normal, nPosition[bestAxis]);
1674
1675	return nCostRatio[bestAxis];
1676	}
1677
1678
1679	bool FromPointVisibilityTree::SelectPlane(Plane3 &bestPlane,
1680	BspLeaf *leaf,
1681	VspBspTraversalData &data,
1682	VspBspTraversalData &frontData,
1683	VspBspTraversalData &backData,
1684	int &splitAxis)
1685	{
1686	// HACK matt: subdivide regularily to certain depth
1687	if (data.mDepth < 0)
1688	{
1689	cout << "d: " << data.mDepth << endl;
1690	// return axis aligned split
1691	AxisAlignedBox3 box;
1692	box.Initialize();
1693
1694	// create bounding box of region
1695	data.mGeometry->GetBoundingBox(box);
1696
1697	const int axis = box.Size().DrivingAxis();
1698	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1699
1700	Vector3 norm(0,0,0); norm[axis] = 1.0f;
1701	bestPlane = Plane3(norm, position);
1702	splitAxis = axis;
1703	return true;
1704	}
1705
1706	// simplest strategy: just take next polygon
1707	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1708	{
1709	if (!data.mPolygons->empty())
1710	{
1711	const int randIdx =
1712	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
1713	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1714
1715	bestPlane = nextPoly->GetSupportingPlane();
1716	return true;
1717	}
1718	}
1719
1720	//-- use heuristics to find appropriate plane
1721
1722	// intermediate plane
1723	Plane3 plane;
1724	float lowestCost = MAX_FLOAT;
1725
1726	// decides if the first few splits should be only axisAligned
1727	const bool onlyAxisAligned =
1728	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1729	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1730	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1731
1732	const int limit = onlyAxisAligned ? 0 :
1733	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1734
1735	float candidateCost;
1736
1737	int maxIdx = (int)data.mPolygons->size();
1738
1739	for (int i = 0; i < limit; ++ i)
1740	{
1741	// the already taken candidates are stored behind maxIdx
1742	// => assure that no index is taken twice
1743	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1744	Polygon3 poly = (data.mPolygons)[candidateIdx];
1745
1746	// swap candidate to the end to avoid testing same plane
1747	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1748	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
1749
1750	// evaluate current candidate
1751	BspNodeGeometry fGeom, bGeom;
1752	float fArea, bArea;
1753	plane = poly->GetSupportingPlane();
1754	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1755
1756	if (candidateCost < lowestCost)
1757	{
1758	bestPlane = plane;
1759	lowestCost = candidateCost;
1760	}
1761	}
1762
1763	//-- evaluate axis aligned splits
1764	int axis;
1765	BspNodeGeometry fGeom, bGeom;
1766	float pFront, pBack;
1767
1768	candidateCost = 99999999.0f;
1769
1770	// option: axis aligned split only if no polygon available
1771	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
1772	{
1773	candidateCost = SelectAxisAlignedPlane(plane,
1774	data,
1775	axis,
1776	&fGeom,
1777	&bGeom,
1778	pFront,
1779	pBack,
1780	data.mIsKdNode);
1781	}
1782
1783	splitAxis = 3;
1784
1785	if (candidateCost < lowestCost)
1786	{
1787	bestPlane = plane;
1788	lowestCost = candidateCost;
1789	splitAxis = axis;
1790
1791	// assign already computed values
1792	// we can do this because we always save the
1793	// computed values from the axis aligned splits
1794
1795	if (fGeom && bGeom)
1796	{
1797	frontData.mGeometry = fGeom;
1798	backData.mGeometry = bGeom;
1799
1800	frontData.mProbability = pFront;
1801	backData.mProbability = pBack;
1802	}
1803	}
1804	else
1805	{
1806	DEL_PTR(fGeom);
1807	DEL_PTR(bGeom);
1808	}
1809
1810	#ifdef _DEBUG
1811	Debug << "plane lowest cost: " << lowestCost << endl;
1812	#endif
1813
1814	// exeeded relative max cost ratio
1815	if (lowestCost > mTermMaxCostRatio)
1816	{
1817	return false;
1818	}
1819
1820	return true;
1821	}
1822
1823
1824	Plane3 FromPointVisibilityTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1825	{
1826	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1827
1828	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1829	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1830
1831	const Vector3 pt = (maxPt + minPt) * 0.5;
1832	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1833
1834	return Plane3(normal, pt);
1835	}
1836
1837
1838	Plane3 FromPointVisibilityTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1839	{
1840	Vector3 pt[3];
1841
1842	int idx[3];
1843	int cmaxT = 0;
1844	int cminT = 0;
1845	bool chooseMin = false;
1846
1847	for (int j = 0; j < 3; ++ j)
1848	{
1849	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1850
1851	if (idx[j] >= (int)rays.size())
1852	{
1853	idx[j] -= (int)rays.size();
1854
1855	chooseMin = (cminT < 2);
1856	}
1857	else
1858	chooseMin = (cmaxT < 2);
1859
1860	RayInfo rayInf = rays[idx[j]];
1861	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1862	}
1863
1864	return Plane3(pt[0], pt[1], pt[2]);
1865	}
1866
1867
1868	Plane3 FromPointVisibilityTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1869	{
1870	Vector3 pt[3];
1871
1872	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1873	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1874
1875	// check if rays different
1876	if (idx1 == idx2)
1877	idx2 = (idx2 + 1) % (int)rays.size();
1878
1879	const RayInfo ray1 = rays[idx1];
1880	const RayInfo ray2 = rays[idx2];
1881
1882	// normal vector of the plane parallel to both lines
1883	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1884
1885	// vector from line 1 to line 2
1886	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1887
1888	// project vector on normal to get distance
1889	const float dist = DotProd(vd, norm);
1890
1891	// point on plane lies halfway between the two planes
1892	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1893
1894	return Plane3(norm, planePt);
1895	}
1896
1897
1898	inline void FromPointVisibilityTree::GenerateUniqueIdsForPvs()
1899	{
1900	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1901	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1902	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1903	}
1904
1905
1906	float FromPointVisibilityTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
1907	const VspBspTraversalData &data) const
1908	{
1909	float pvsFront = 0;
1910	float pvsBack = 0;
1911	float totalPvs = 0;
1912
1913	// probability that view point lies in back / front node
1914	float pOverall = data.mProbability;
1915	float pFront = 0;
1916	float pBack = 0;
1917
1918
1919	// create unique ids for pvs heuristics
1920	GenerateUniqueIdsForPvs();
1921
1922	for (int i = 0; i < data.mRays->size(); ++ i)
1923	{
1924	RayInfo rayInf = (*data.mRays)[i];
1925
1926	float t;
1927	VssRay *ray = rayInf.mRay;
1928	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1929
1930	// find front and back pvs for origing and termination object
1931	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
1932	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
1933	}
1934
1935
1936	BspNodeGeometry geomFront;
1937	BspNodeGeometry geomBack;
1938
1939	// construct child geometry with regard to the candidate split plane
1940	data.mGeometry->SplitGeometry(geomFront,
1941	geomBack,
1942	candidatePlane,
1943	mBox,
1944	//0.0f);
1945	mEpsilon);
1946
1947	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
1948	{
1949	pFront = geomFront.GetVolume();
1950	pBack = pOverall - pFront;
1951
1952	// something is wrong with the volume
1953	if ((pFront < 0.0) \|\| (pBack < 0.0))
1954	{
1955	Debug << "ERROR in volume:\n"
1956	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
1957	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
1958	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
1959	}
1960	}
1961	else
1962	{
1963	pFront = geomFront.GetArea();
1964	pBack = geomBack.GetArea();
1965	}
1966
1967
1968	// -- pvs rendering heuristics
1969	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1970	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1971
1972	// only render cost heuristics or combined with standard deviation
1973	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
1974	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1975	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1976
1977	const float oldRenderCost = pOverall * penaltyOld;
1978	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1979
1980	//Debug << "decrease: " << oldRenderCost - newRenderCost << endl;
1981	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBox.GetVolume();
1982
1983
1984	#if 1
1985	// also take render cost of node into account to avoid unsubdivided regions which
1986	// could reduce the render cost after some subdivisions
1987	const float normalizedOldRenderCost = oldRenderCost / mBox.GetVolume();
1988	return 0.99f * renderCostDecrease + 0.01f * normalizedOldRenderCost;
1989	#else
1990	return renderCostDecrease;
1991	#endif
1992	}
1993
1994
1995	float FromPointVisibilityTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
1996	const VspBspTraversalData &data,
1997	BspNodeGeometry &geomFront,
1998	BspNodeGeometry &geomBack,
1999	float &pFront,
2000	float &pBack) const
2001	{
2002	float cost = 0;
2003
2004	float totalPvs = 0;
2005	float pvsFront = 0;
2006	float pvsBack = 0;
2007
2008	// probability that view point lies in back / front node
2009	float pOverall = 0;
2010	pFront = 0;
2011	pBack = 0;
2012
2013
2014	int limit;
2015	bool useRand;
2016
2017	// create unique ids for pvs heuristics
2018	GenerateUniqueIdsForPvs();
2019
2020	// choose test rays randomly if too much
2021	if ((int)data.mRays->size() > mMaxTests)
2022	{
2023	useRand = true;
2024	limit = mMaxTests;
2025	}
2026	else
2027	{
2028	useRand = false;
2029	limit = (int)data.mRays->size();
2030	}
2031
2032	for (int i = 0; i < limit; ++ i)
2033	{
2034	const int testIdx = useRand ?
2035	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
2036	RayInfo rayInf = (*data.mRays)[testIdx];
2037
2038	float t;
2039	VssRay *ray = rayInf.mRay;
2040	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
2041
2042	// find front and back pvs for origing and termination object
2043	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2044	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2045	}
2046
2047	// construct child geometry with regard to the candidate split plane
2048	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
2049	geomBack,
2050	candidatePlane,
2051	mBox,
2052	//0.0f);
2053	mEpsilon);
2054
2055	pOverall = data.mProbability;
2056
2057	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
2058	{
2059	pFront = geomFront.GetVolume();
2060	pBack = pOverall - pFront;
2061
2062	// HACK: precision issues possible for unbalanced split => don't take this split!
2063	if (1 &&
2064	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
2065	!geomFront.Valid() \|\| !geomBack.Valid()))
2066	{
2067	//Debug << "error f: " << pFront << " b: " << pBack << endl;
2068	// high penalty for this split
2069	return 99999.9f;
2070	}
2071	}
2072	else
2073	{
2074	pFront = geomFront.GetArea();
2075	pBack = geomBack.GetArea();
2076	}
2077
2078
2079	// -- pvs rendering heuristics
2080	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
2081	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
2082
2083	// only render cost heuristics or combined with standard deviation
2084	const float penaltyOld = EvalPvsPenalty((int)totalPvs, lowerPvsLimit, upperPvsLimit);
2085	const float penaltyFront = EvalPvsPenalty((int)pvsFront, lowerPvsLimit, upperPvsLimit);
2086	const float penaltyBack = EvalPvsPenalty((int)pvsBack, lowerPvsLimit, upperPvsLimit);
2087
2088	const float oldRenderCost = pOverall * penaltyOld;
2089	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2090
2091	float oldCost, newCost;
2092
2093	// only render cost
2094	if (1)
2095	{
2096	oldCost = oldRenderCost;
2097	newCost = newRenderCost;
2098	}
2099	else // also considering standard deviation
2100	{
2101	// standard deviation is difference of back and front pvs
2102	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
2103
2104	const float newDeviation = 0.5f *
2105	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
2106
2107	const float oldDeviation = penaltyOld;
2108
2109	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
2110	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
2111	}
2112
2113	cost += mPvsFactor * newCost / (oldCost + Limits::Small);
2114
2115
2116	#ifdef _DEBUG
2117	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
2118	<< " frontpvs: " << pvsFront << " pFront: " << pFront
2119	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
2120	Debug << "cost: " << cost << endl;
2121	#endif
2122
2123	return cost;
2124	}
2125
2126
2127	int FromPointVisibilityTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
2128	ViewCellContainer &viewCells) const
2129	{
2130	stack<bspNodePair> nodeStack;
2131	BspNodeGeometry *rgeom = new BspNodeGeometry();
2132
2133	ConstructGeometry(mRoot, *rgeom);
2134
2135	nodeStack.push(bspNodePair(mRoot, rgeom));
2136
2137	ViewCell::NewMail();
2138
2139	while (!nodeStack.empty())
2140	{
2141	BspNode *node = nodeStack.top().first;
2142	BspNodeGeometry *geom = nodeStack.top().second;
2143	nodeStack.pop();
2144
2145	const int side = geom->ComputeIntersection(box);
2146
2147	switch (side)
2148	{
2149	case -1:
2150	// node geometry is contained in box
2151	CollectViewCells(node, true, viewCells, true);
2152	break;
2153
2154	case 0:
2155	if (node->IsLeaf())
2156	{
2157	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2158
2159	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2160	{
2161	leaf->GetViewCell()->Mail();
2162	viewCells.push_back(leaf->GetViewCell());
2163	}
2164	}
2165	else
2166	{
2167	BspInterior interior = dynamic_cast<BspInterior >(node);
2168
2169	BspNode *first = interior->GetFront();
2170	BspNode *second = interior->GetBack();
2171
2172	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2173	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2174
2175	geom->SplitGeometry(*firstGeom,
2176	*secondGeom,
2177	interior->GetPlane(),
2178	mBox,
2179	//0.0000001f);
2180	mEpsilon);
2181
2182	nodeStack.push(bspNodePair(first, firstGeom));
2183	nodeStack.push(bspNodePair(second, secondGeom));
2184	}
2185
2186	break;
2187	default:
2188	// default: cull
2189	break;
2190	}
2191
2192	DEL_PTR(geom);
2193
2194	}
2195
2196	return (int)viewCells.size();
2197	}
2198
2199
2200	float FromPointVisibilityTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
2201	const AxisAlignedBox3 &box,
2202	const int axis,
2203	const float &position,
2204	float &pFront,
2205	float &pBack) const
2206	{
2207	float pvsTotal = 0;
2208	float pvsFront = 0;
2209	float pvsBack = 0;
2210
2211	// create unique ids for pvs heuristics
2212	GenerateUniqueIdsForPvs();
2213
2214	const int pvsSize = data.mPvs;
2215
2216	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
2217
2218	// this is the main ray classification loop!
2219	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
2220	{
2221	//if (!(*rit).mRay->IsActive()) continue;
2222
2223	// determine the side of this ray with respect to the plane
2224	float t;
2225	const int side = (*rit).ComputeRayIntersection(axis, position, t);
2226
2227	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
2228	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
2229	}
2230
2231	//-- pvs heuristics
2232	float pOverall;
2233
2234	//-- compute heurstics
2235	//-- we take simplified computation for mid split
2236
2237	pOverall = data.mProbability;
2238
2239	if (!mUseAreaForPvs)
2240	{ // volume
2241	pBack = pFront = pOverall * 0.5f;
2242
2243	#if 0
2244	// box length substitute for probability
2245	const float minBox = box.Min(axis);
2246	const float maxBox = box.Max(axis);
2247
2248	pBack = position - minBox;
2249	pFront = maxBox - position;
2250	pOverall = maxBox - minBox;
2251	#endif
2252	}
2253	else //-- area substitute for probability
2254	{
2255	const int axis2 = (axis + 1) % 3;
2256	const int axis3 = (axis + 2) % 3;
2257
2258	const float faceArea =
2259	(box.Max(axis2) - box.Min(axis2)) *
2260	(box.Max(axis3) - box.Min(axis3));
2261
2262	pBack = pFront = pOverall * 0.5f + faceArea;
2263	}
2264
2265	#ifdef _DEBUG
2266	Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
2267	Debug << pFront << " " << pBack << " " << pOverall << endl;
2268	#endif
2269
2270
2271	const float newCost = pvsBack * pBack + pvsFront * pFront;
2272	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
2273
2274	return (mCtDivCi + newCost) / oldCost;
2275	}
2276
2277
2278	void FromPointVisibilityTree::AddObjToPvs(Intersectable *obj,
2279	const int cf,
2280	float &frontPvs,
2281	float &backPvs,
2282	float &totalPvs) const
2283	{
2284	if (!obj)
2285	return;
2286
2287	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
2288
2289	// new object
2290	if ((obj->mMailbox != sFrontId) &&
2291	(obj->mMailbox != sBackId) &&
2292	(obj->mMailbox != sFrontAndBackId))
2293	{
2294	totalPvs += renderCost;
2295	}
2296
2297	// TODO: does this really belong to no pvs?
2298	//if (cf == Ray::COINCIDENT) return;
2299
2300	// object belongs to both PVS
2301	if (cf >= 0)
2302	{
2303	if ((obj->mMailbox != sFrontId) &&
2304	(obj->mMailbox != sFrontAndBackId))
2305	{
2306	frontPvs += renderCost;
2307
2308	if (obj->mMailbox == sBackId)
2309	obj->mMailbox = sFrontAndBackId;
2310	else
2311	obj->mMailbox = sFrontId;
2312	}
2313	}
2314
2315	if (cf <= 0)
2316	{
2317	if ((obj->mMailbox != sBackId) &&
2318	(obj->mMailbox != sFrontAndBackId))
2319	{
2320	backPvs += renderCost;
2321
2322	if (obj->mMailbox == sFrontId)
2323	obj->mMailbox = sFrontAndBackId;
2324	else
2325	obj->mMailbox = sBackId;
2326	}
2327	}
2328	}
2329
2330
2331	void FromPointVisibilityTree::CollectLeaves(vector<BspLeaf *> &leaves,
2332	const bool onlyUnmailed,
2333	const int maxPvsSize) const
2334	{
2335	stack<BspNode *> nodeStack;
2336	nodeStack.push(mRoot);
2337
2338	while (!nodeStack.empty())
2339	{
2340	BspNode *node = nodeStack.top();
2341	nodeStack.pop();
2342
2343	if (node->IsLeaf())
2344	{
2345	// test if this leaf is in valid view space
2346	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2347	if (leaf->TreeValid() &&
2348	(!onlyUnmailed \|\| !leaf->Mailed()) &&
2349	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().GetSize() <= maxPvsSize)))
2350	{
2351	leaves.push_back(leaf);
2352	}
2353	}
2354	else
2355	{
2356	BspInterior interior = dynamic_cast<BspInterior >(node);
2357
2358	nodeStack.push(interior->GetBack());
2359	nodeStack.push(interior->GetFront());
2360	}
2361	}
2362	}
2363
2364
2365	AxisAlignedBox3 FromPointVisibilityTree::GetBoundingBox() const
2366	{
2367	return mBox;
2368	}
2369
2370
2371	BspNode *FromPointVisibilityTree::GetRoot() const
2372	{
2373	return mRoot;
2374	}
2375
2376
2377	void FromPointVisibilityTree::EvaluateLeafStats(const VspBspTraversalData &data)
2378	{
2379	// the node became a leaf -> evaluate stats for leafs
2380	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
2381
2382
2383	if (data.mPvs > mBspStats.maxPvs)
2384	{
2385	mBspStats.maxPvs = data.mPvs;
2386	}
2387
2388	mBspStats.pvs += data.mPvs;
2389
2390	if (data.mDepth < mBspStats.minDepth)
2391	{
2392	mBspStats.minDepth = data.mDepth;
2393	}
2394
2395	if (data.mDepth >= mTermMaxDepth)
2396	{
2397	++ mBspStats.maxDepthNodes;
2398	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
2399	}
2400
2401	// accumulate rays to compute rays / leaf
2402	mBspStats.accumRays += (int)data.mRays->size();
2403
2404	if (data.mPvs < mTermMinPvs)
2405	++ mBspStats.minPvsNodes;
2406
2407	if ((int)data.mRays->size() < mTermMinRays)
2408	++ mBspStats.minRaysNodes;
2409
2410	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
2411	++ mBspStats.maxRayContribNodes;
2412
2413	if (data.mProbability <= mTermMinProbability)
2414	++ mBspStats.minProbabilityNodes;
2415
2416	// accumulate depth to compute average depth
2417	mBspStats.accumDepth += data.mDepth;
2418
2419	++ mCreatedViewCells;
2420
2421	#ifdef _DEBUG
2422	Debug << "BSP stats: "
2423	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
2424	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
2425	// << "Area: " << data.mProbability << " (min: " << mTermMinProbability << "), "
2426	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
2427	<< "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
2428	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
2429	#endif
2430	}
2431
2432
2433	int FromPointVisibilityTree::CastRay(Ray &ray)
2434	{
2435	int hits = 0;
2436
2437	stack<BspRayTraversalData> tQueue;
2438
2439	float maxt, mint;
2440
2441	if (!mBox.GetRaySegment(ray, mint, maxt))
2442	return 0;
2443
2444	Intersectable::NewMail();
2445	ViewCell::NewMail();
2446	Vector3 entp = ray.Extrap(mint);
2447	Vector3 extp = ray.Extrap(maxt);
2448
2449	BspNode *node = mRoot;
2450	BspNode *farChild = NULL;
2451
2452	while (1)
2453	{
2454	if (!node->IsLeaf())
2455	{
2456	BspInterior in = dynamic_cast<BspInterior >(node);
2457
2458	Plane3 splitPlane = in->GetPlane();
2459	const int entSide = splitPlane.Side(entp);
2460	const int extSide = splitPlane.Side(extp);
2461
2462	if (entSide < 0)
2463	{
2464	node = in->GetBack();
2465
2466	if(extSide <= 0) // plane does not split ray => no far child
2467	continue;
2468
2469	farChild = in->GetFront(); // plane splits ray
2470
2471	} else if (entSide > 0)
2472	{
2473	node = in->GetFront();
2474
2475	if (extSide >= 0) // plane does not split ray => no far child
2476	continue;
2477
2478	farChild = in->GetBack(); // plane splits ray
2479	}
2480	else // ray and plane are coincident
2481	{
2482	// WHAT TO DO IN THIS CASE ?
2483	//break;
2484	node = in->GetFront();
2485	continue;
2486	}
2487
2488	// push data for far child
2489	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
2490
2491	// find intersection of ray segment with plane
2492	float t;
2493	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
2494	maxt *= t;
2495
2496	} else // reached leaf => intersection with view cell
2497	{
2498	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2499
2500	if (!leaf->GetViewCell()->Mailed())
2501	{
2502	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
2503	leaf->GetViewCell()->Mail();
2504	++ hits;
2505	}
2506
2507	//-- fetch the next far child from the stack
2508	if (tQueue.empty())
2509	break;
2510
2511	entp = extp;
2512	mint = maxt; // NOTE: need this?
2513
2514	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
2515	break;
2516
2517	BspRayTraversalData &s = tQueue.top();
2518
2519	node = s.mNode;
2520	extp = s.mExitPoint;
2521	maxt = s.mMaxT;
2522
2523	tQueue.pop();
2524	}
2525	}
2526
2527	return hits;
2528	}
2529
2530
2531	void FromPointVisibilityTree::CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const
2532	{
2533	ViewCell::NewMail();
2534
2535	CollectViewCells(mRoot, onlyValid, viewCells, true);
2536	}
2537
2538
2539	void FromPointVisibilityTree::CollapseViewCells()
2540	{
2541	// TODO
2542	#if HAS_TO_BE_REDONE
2543	stack<BspNode *> nodeStack;
2544
2545	if (!mRoot)
2546	return;
2547
2548	nodeStack.push(mRoot);
2549
2550	while (!nodeStack.empty())
2551	{
2552	BspNode *node = nodeStack.top();
2553	nodeStack.pop();
2554
2555	if (node->IsLeaf())
2556	{
2557	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2558
2559	if (!viewCell->GetValid())
2560	{
2561	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2562
2563	ViewCellContainer leaves;
2564	mViewCellsTree->CollectLeaves(viewCell, leaves);
2565
2566	ViewCellContainer::const_iterator it, it_end = leaves.end();
2567
2568	for (it = leaves.begin(); it != it_end; ++ it)
2569	{
2570	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2571	l->SetViewCell(GetOrCreateOutOfBoundsCell());
2572	++ mBspStats.invalidLeaves;
2573	}
2574
2575	// add to unbounded view cell
2576	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
2577	DEL_PTR(viewCell);
2578	}
2579	}
2580	else
2581	{
2582	BspInterior interior = dynamic_cast<BspInterior >(node);
2583
2584	nodeStack.push(interior->GetFront());
2585	nodeStack.push(interior->GetBack());
2586	}
2587	}
2588
2589	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2590	#endif
2591	}
2592
2593
2594	void FromPointVisibilityTree::CollectRays(VssRayContainer &rays)
2595	{
2596	vector<BspLeaf *> leaves;
2597
2598	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
2599
2600	for (lit = leaves.begin(); lit != lit_end; ++ lit)
2601	{
2602	BspLeaf leaf = lit;
2603	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
2604
2605	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
2606	rays.push_back(*rit);
2607	}
2608	}
2609
2610
2611	void FromPointVisibilityTree::ValidateTree()
2612	{
2613	stack<BspNode *> nodeStack;
2614
2615	if (!mRoot)
2616	return;
2617
2618	nodeStack.push(mRoot);
2619
2620	mBspStats.invalidLeaves = 0;
2621	while (!nodeStack.empty())
2622	{
2623	BspNode *node = nodeStack.top();
2624	nodeStack.pop();
2625
2626	if (node->IsLeaf())
2627	{
2628	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2629
2630	if (!leaf->GetViewCell()->GetValid())
2631	++ mBspStats.invalidLeaves;
2632
2633	// validity flags don't match => repair
2634	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
2635	{
2636	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
2637	PropagateUpValidity(leaf);
2638	}
2639	}
2640	else
2641	{
2642	BspInterior interior = dynamic_cast<BspInterior >(node);
2643
2644	nodeStack.push(interior->GetFront());
2645	nodeStack.push(interior->GetBack());
2646	}
2647	}
2648
2649	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2650	}
2651
2652
2653
2654	void FromPointVisibilityTree::CollectViewCells(BspNode *root,
2655	bool onlyValid,
2656	ViewCellContainer &viewCells,
2657	bool onlyUnmailed) const
2658	{
2659	stack<BspNode *> nodeStack;
2660
2661	if (!root)
2662	return;
2663
2664	nodeStack.push(root);
2665
2666	while (!nodeStack.empty())
2667	{
2668	BspNode *node = nodeStack.top();
2669	nodeStack.pop();
2670
2671	if (node->IsLeaf())
2672	{
2673	if (!onlyValid \|\| node->TreeValid())
2674	{
2675	ViewCellLeaf leafVc = dynamic_cast<BspLeaf >(node)->GetViewCell();
2676
2677	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
2678
2679	if (!onlyUnmailed \|\| !viewCell->Mailed())
2680	{
2681	viewCell->Mail();
2682	viewCells.push_back(viewCell);
2683	}
2684	}
2685	}
2686	else
2687	{
2688	BspInterior interior = dynamic_cast<BspInterior >(node);
2689
2690	nodeStack.push(interior->GetFront());
2691	nodeStack.push(interior->GetBack());
2692	}
2693	}
2694
2695	}
2696
2697
2698	void FromPointVisibilityTree::PreprocessPolygons(PolygonContainer &polys)
2699	{
2700	// preprocess: throw out polygons coincident to the view space box (not needed)
2701	PolygonContainer boxPolys;
2702	mBox.ExtractPolys(boxPolys);
2703	vector<Plane3> boxPlanes;
2704
2705	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2706
2707	// extract planes of box
2708	// TODO: can be done more elegantly than first extracting polygons
2709	// and take their planes
2710	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2711	{
2712	boxPlanes.push_back((*pit)->GetSupportingPlane());
2713	}
2714
2715	pit_end = polys.end();
2716
2717	for (pit = polys.begin(); pit != pit_end; ++ pit)
2718	{
2719	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2720
2721	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2722	{
2723	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2724
2725	if (cf == Polygon3::COINCIDENT)
2726	{
2727	DEL_PTR(*pit);
2728	//Debug << "coincident!!" << endl;
2729	}
2730	}
2731	}
2732
2733	// remove deleted entries
2734	for (int i = 0; i < (int)polys.size(); ++ i)
2735	{
2736	while (!polys[i] && (i < (int)polys.size()))
2737	{
2738	swap(polys[i], polys.back());
2739	polys.pop_back();
2740	}
2741	}
2742	}
2743
2744
2745	float FromPointVisibilityTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2746	{
2747	float len = 0;
2748
2749	RayInfoContainer::const_iterator it, it_end = rays.end();
2750
2751	for (it = rays.begin(); it != it_end; ++ it)
2752	len += (*it).SegmentLength();
2753
2754	return len;
2755	}
2756
2757
2758	int FromPointVisibilityTree::SplitRays(const Plane3 &plane,
2759	RayInfoContainer &rays,
2760	RayInfoContainer &frontRays,
2761	RayInfoContainer &backRays) const
2762	{
2763	int splits = 0;
2764
2765	RayInfoContainer::const_iterator it, it_end = rays.end();
2766
2767	for (it = rays.begin(); it != it_end; ++ it)
2768	{
2769	RayInfo bRay = *it;
2770
2771	VssRay *ray = bRay.mRay;
2772	float t;
2773
2774	// get classification and receive new t
2775	const int cf = bRay.ComputeRayIntersection(plane, t);
2776
2777	switch (cf)
2778	{
2779	case -1:
2780	backRays.push_back(bRay);
2781	break;
2782	case 1:
2783	frontRays.push_back(bRay);
2784	break;
2785	case 0:
2786	{
2787	//-- split ray
2788	// test if start point behind or in front of plane
2789	const int side = plane.Side(bRay.ExtrapOrigin());
2790
2791	if (side <= 0)
2792	{
2793	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2794	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2795	}
2796	else
2797	{
2798	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2799	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2800	}
2801	}
2802	break;
2803	default:
2804	Debug << "Should not come here" << endl;
2805	break;
2806	}
2807	}
2808
2809	return splits;
2810	}
2811
2812
2813	void FromPointVisibilityTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2814	{
2815	BspNode *lastNode;
2816
2817	do
2818	{
2819	lastNode = n;
2820
2821	// want to get planes defining geometry of this node => don't take
2822	// split plane of node itself
2823	n = n->GetParent();
2824
2825	if (n)
2826	{
2827	BspInterior interior = dynamic_cast<BspInterior >(n);
2828	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
2829
2830	if (interior->GetBack() != lastNode)
2831	halfSpace.ReverseOrientation();
2832
2833	halfSpaces.push_back(halfSpace);
2834	}
2835	}
2836	while (n);
2837	}
2838
2839
2840	void FromPointVisibilityTree::ConstructGeometry(BspNode *n,
2841	BspNodeGeometry &geom) const
2842	{
2843	vector<Plane3> halfSpaces;
2844	ExtractHalfSpaces(n, halfSpaces);
2845
2846	PolygonContainer candidatePolys;
2847	vector<Plane3> candidatePlanes;
2848
2849	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
2850
2851	// bounded planes are added to the polygons
2852	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
2853	{
2854	Polygon3 p = GetBoundingBox().CrossSection(pit);
2855
2856	if (p->Valid(mEpsilon))
2857	{
2858	candidatePolys.push_back(p);
2859	candidatePlanes.push_back(*pit);
2860	}
2861	}
2862
2863	// add faces of bounding box (also could be faces of the cell)
2864	for (int i = 0; i < 6; ++ i)
2865	{
2866	VertexContainer vertices;
2867
2868	for (int j = 0; j < 4; ++ j)
2869	vertices.push_back(mBox.GetFace(i).mVertices[j]);
2870
2871	Polygon3 *poly = new Polygon3(vertices);
2872
2873	candidatePolys.push_back(poly);
2874	candidatePlanes.push_back(poly->GetSupportingPlane());
2875	}
2876
2877	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2878	{
2879	// polygon is split by all other planes
2880	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2881	{
2882	if (i == j) // polygon and plane are coincident
2883	continue;
2884
2885	VertexContainer splitPts;
2886	Polygon3 frontPoly, backPoly;
2887
2888	const int cf =
2889	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2890	mEpsilon);
2891
2892	switch (cf)
2893	{
2894	case Polygon3::SPLIT:
2895	frontPoly = new Polygon3();
2896	backPoly = new Polygon3();
2897
2898	candidatePolys[i]->Split(halfSpaces[j],
2899	*frontPoly,
2900	*backPoly,
2901	mEpsilon);
2902
2903	DEL_PTR(candidatePolys[i]);
2904
2905	if (backPoly->Valid(mEpsilon))
2906	candidatePolys[i] = backPoly;
2907	else
2908	DEL_PTR(backPoly);
2909
2910	// outside, don't need this
2911	DEL_PTR(frontPoly);
2912	break;
2913	// polygon outside of halfspace
2914	case Polygon3::FRONT_SIDE:
2915	DEL_PTR(candidatePolys[i]);
2916	break;
2917	// just take polygon as it is
2918	case Polygon3::BACK_SIDE:
2919	case Polygon3::COINCIDENT:
2920	default:
2921	break;
2922	}
2923	}
2924
2925	if (candidatePolys[i])
2926	{
2927	geom.Add(candidatePolys[i], candidatePlanes[i]);
2928	// geom.mPolys.push_back(candidates[i]);
2929	}
2930	}
2931	}
2932
2933
2934	void FromPointVisibilityTree::ConstructGeometry(ViewCell *vc,
2935	BspNodeGeometry &vcGeom) const
2936	{
2937	ViewCellContainer leaves;
2938
2939	mViewCellsTree->CollectLeaves(vc, leaves);
2940
2941	ViewCellContainer::const_iterator it, it_end = leaves.end();
2942
2943	for (it = leaves.begin(); it != it_end; ++ it)
2944	{
2945	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2946
2947	ConstructGeometry(l, vcGeom);
2948	}
2949	}
2950
2951
2952	int FromPointVisibilityTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
2953	const bool onlyUnmailed) const
2954	{
2955	stack<bspNodePair> nodeStack;
2956
2957	BspNodeGeometry nodeGeom;
2958	ConstructGeometry(n, nodeGeom);
2959	// const float eps = 0.5f;
2960	const float eps = 0.01f;
2961	// split planes from the root to this node
2962	// needed to verify that we found neighbor leaf
2963	// TODO: really needed?
2964	vector<Plane3> halfSpaces;
2965	ExtractHalfSpaces(n, halfSpaces);
2966
2967
2968	BspNodeGeometry *rgeom = new BspNodeGeometry();
2969	ConstructGeometry(mRoot, *rgeom);
2970
2971	nodeStack.push(bspNodePair(mRoot, rgeom));
2972
2973	while (!nodeStack.empty())
2974	{
2975	BspNode *node = nodeStack.top().first;
2976	BspNodeGeometry *geom = nodeStack.top().second;
2977
2978	nodeStack.pop();
2979
2980	if (node->IsLeaf())
2981	{
2982	// test if this leaf is in valid view space
2983	if (node->TreeValid() &&
2984	(node != n) &&
2985	(!onlyUnmailed \|\| !node->Mailed()))
2986	{
2987	bool isAdjacent = true;
2988
2989	if (1)
2990	{
2991	// test all planes of current node if still adjacent
2992	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
2993	{
2994	const int cf =
2995	Polygon3::ClassifyPlane(geom->GetPolys(),
2996	halfSpaces[i],
2997	eps);
2998
2999	if (cf == Polygon3::FRONT_SIDE)
3000	{
3001	isAdjacent = false;
3002	}
3003	}
3004	}
3005	else
3006	{
3007	// TODO: why is this wrong??
3008	// test all planes of current node if still adjacent
3009	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
3010	{
3011	Polygon3 *poly = nodeGeom.GetPolys()[i];
3012
3013	const int cf =
3014	Polygon3::ClassifyPlane(geom->GetPolys(),
3015	poly->GetSupportingPlane(),
3016	eps);
3017
3018	if (cf == Polygon3::FRONT_SIDE)
3019	{
3020	isAdjacent = false;
3021	}
3022	}
3023	}
3024	// neighbor was found
3025	if (isAdjacent)
3026	{
3027	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
3028	}
3029	}
3030	}
3031	else
3032	{
3033	BspInterior interior = dynamic_cast<BspInterior >(node);
3034
3035	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3036	interior->GetPlane(),
3037	eps);
3038
3039	BspNode *front = interior->GetFront();
3040	BspNode *back = interior->GetBack();
3041
3042	BspNodeGeometry *fGeom = new BspNodeGeometry();
3043	BspNodeGeometry *bGeom = new BspNodeGeometry();
3044
3045	geom->SplitGeometry(*fGeom,
3046	*bGeom,
3047	interior->GetPlane(),
3048	mBox,
3049	//0.0000001f);
3050	eps);
3051
3052	if (cf == Polygon3::BACK_SIDE)
3053	{
3054	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3055	DEL_PTR(fGeom);
3056	}
3057	else
3058	{
3059	if (cf == Polygon3::FRONT_SIDE)
3060	{
3061	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3062	DEL_PTR(bGeom);
3063	}
3064	else
3065	{ // random decision
3066	nodeStack.push(bspNodePair(front, fGeom));
3067	nodeStack.push(bspNodePair(back, bGeom));
3068	}
3069	}
3070	}
3071
3072	DEL_PTR(geom);
3073	}
3074
3075	return (int)neighbors.size();
3076	}
3077
3078
3079
3080	int FromPointVisibilityTree::FindApproximateNeighbors(BspNode *n,
3081	vector<BspLeaf *> &neighbors,
3082	const bool onlyUnmailed) const
3083	{
3084	stack<bspNodePair> nodeStack;
3085
3086	BspNodeGeometry nodeGeom;
3087	ConstructGeometry(n, nodeGeom);
3088
3089	float eps = 0.01f;
3090	// split planes from the root to this node
3091	// needed to verify that we found neighbor leaf
3092	// TODO: really needed?
3093	vector<Plane3> halfSpaces;
3094	ExtractHalfSpaces(n, halfSpaces);
3095
3096
3097	BspNodeGeometry *rgeom = new BspNodeGeometry();
3098	ConstructGeometry(mRoot, *rgeom);
3099
3100	nodeStack.push(bspNodePair(mRoot, rgeom));
3101
3102	while (!nodeStack.empty())
3103	{
3104	BspNode *node = nodeStack.top().first;
3105	BspNodeGeometry *geom = nodeStack.top().second;
3106
3107	nodeStack.pop();
3108
3109	if (node->IsLeaf())
3110	{
3111	// test if this leaf is in valid view space
3112	if (node->TreeValid() &&
3113	(node != n) &&
3114	(!onlyUnmailed \|\| !node->Mailed()))
3115	{
3116	bool isAdjacent = true;
3117
3118	// neighbor was found
3119	if (isAdjacent)
3120	{
3121	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
3122	}
3123	}
3124	}
3125	else
3126	{
3127	BspInterior interior = dynamic_cast<BspInterior >(node);
3128
3129	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3130	interior->GetPlane(),
3131	eps);
3132
3133	BspNode *front = interior->GetFront();
3134	BspNode *back = interior->GetBack();
3135
3136	BspNodeGeometry *fGeom = new BspNodeGeometry();
3137	BspNodeGeometry *bGeom = new BspNodeGeometry();
3138
3139	geom->SplitGeometry(*fGeom,
3140	*bGeom,
3141	interior->GetPlane(),
3142	mBox,
3143	//0.0000001f);
3144	eps);
3145
3146	if (cf == Polygon3::BACK_SIDE)
3147	{
3148	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3149	DEL_PTR(fGeom);
3150	}
3151	else
3152	{
3153	if (cf == Polygon3::FRONT_SIDE)
3154	{
3155	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3156	DEL_PTR(bGeom);
3157	}
3158	else
3159	{ // random decision
3160	nodeStack.push(bspNodePair(front, fGeom));
3161	nodeStack.push(bspNodePair(back, bGeom));
3162	}
3163	}
3164	}
3165
3166	DEL_PTR(geom);
3167	}
3168
3169	return (int)neighbors.size();
3170	}
3171
3172
3173
3174	BspLeaf *FromPointVisibilityTree::GetRandomLeaf(const Plane3 &halfspace)
3175	{
3176	stack<BspNode *> nodeStack;
3177	nodeStack.push(mRoot);
3178
3179	int mask = rand();
3180
3181	while (!nodeStack.empty())
3182	{
3183	BspNode *node = nodeStack.top();
3184	nodeStack.pop();
3185
3186	if (node->IsLeaf())
3187	{
3188	return dynamic_cast<BspLeaf *>(node);
3189	}
3190	else
3191	{
3192	BspInterior interior = dynamic_cast<BspInterior >(node);
3193	BspNode *next;
3194	BspNodeGeometry geom;
3195
3196	// todo: not very efficient: constructs full cell everytime
3197	ConstructGeometry(interior, geom);
3198
3199	const int cf =
3200	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
3201
3202	if (cf == Polygon3::BACK_SIDE)
3203	next = interior->GetFront();
3204	else
3205	if (cf == Polygon3::FRONT_SIDE)
3206	next = interior->GetFront();
3207	else
3208	{
3209	// random decision
3210	if (mask & 1)
3211	next = interior->GetBack();
3212	else
3213	next = interior->GetFront();
3214	mask = mask >> 1;
3215	}
3216
3217	nodeStack.push(next);
3218	}
3219	}
3220
3221	return NULL;
3222	}
3223
3224
3225	BspLeaf *FromPointVisibilityTree::GetRandomLeaf(const bool onlyUnmailed)
3226	{
3227	stack<BspNode *> nodeStack;
3228
3229	nodeStack.push(mRoot);
3230
3231	int mask = rand();
3232
3233	while (!nodeStack.empty())
3234	{
3235	BspNode *node = nodeStack.top();
3236	nodeStack.pop();
3237
3238	if (node->IsLeaf())
3239	{
3240	if ( (!onlyUnmailed \|\| !node->Mailed()) )
3241	return dynamic_cast<BspLeaf *>(node);
3242	}
3243	else
3244	{
3245	BspInterior interior = dynamic_cast<BspInterior >(node);
3246
3247	// random decision
3248	if (mask & 1)
3249	nodeStack.push(interior->GetBack());
3250	else
3251	nodeStack.push(interior->GetFront());
3252
3253	mask = mask >> 1;
3254	}
3255	}
3256
3257	return NULL;
3258	}
3259
3260
3261	int FromPointVisibilityTree::ComputePvsSize(const RayInfoContainer &rays) const
3262	{
3263	int pvsSize = 0;
3264
3265	RayInfoContainer::const_iterator rit, rit_end = rays.end();
3266
3267	Intersectable::NewMail();
3268
3269	for (rit = rays.begin(); rit != rays.end(); ++ rit)
3270	{
3271	VssRay ray = (rit).mRay;
3272
3273	if (ray->mOriginObject)
3274	{
3275	if (!ray->mOriginObject->Mailed())
3276	{
3277	ray->mOriginObject->Mail();
3278	++ pvsSize;
3279	}
3280	}
3281	if (ray->mTerminationObject)
3282	{
3283	if (!ray->mTerminationObject->Mailed())
3284	{
3285	ray->mTerminationObject->Mail();
3286	++ pvsSize;
3287	}
3288	}
3289	}
3290
3291	return pvsSize;
3292	}
3293
3294
3295	float FromPointVisibilityTree::GetEpsilon() const
3296	{
3297	return mEpsilon;
3298	}
3299
3300
3301	int FromPointVisibilityTree::SplitPolygons(const Plane3 &plane,
3302	PolygonContainer &polys,
3303	PolygonContainer &frontPolys,
3304	PolygonContainer &backPolys,
3305	PolygonContainer &coincident) const
3306	{
3307	int splits = 0;
3308
3309	PolygonContainer::const_iterator it, it_end = polys.end();
3310
3311	for (it = polys.begin(); it != polys.end(); ++ it)
3312	{
3313	Polygon3 poly = it;
3314
3315	// classify polygon
3316	const int cf = poly->ClassifyPlane(plane, mEpsilon);
3317
3318	switch (cf)
3319	{
3320	case Polygon3::COINCIDENT:
3321	coincident.push_back(poly);
3322	break;
3323	case Polygon3::FRONT_SIDE:
3324	frontPolys.push_back(poly);
3325	break;
3326	case Polygon3::BACK_SIDE:
3327	backPolys.push_back(poly);
3328	break;
3329	case Polygon3::SPLIT:
3330	backPolys.push_back(poly);
3331	frontPolys.push_back(poly);
3332	++ splits;
3333	break;
3334	default:
3335	Debug << "SHOULD NEVER COME HERE\n";
3336	break;
3337	}
3338	}
3339
3340	return splits;
3341	}
3342
3343
3344	int FromPointVisibilityTree::CastLineSegment(const Vector3 &origin,
3345	const Vector3 &termination,
3346	vector<ViewCell *> &viewcells)
3347	{
3348	int hits = 0;
3349	stack<BspRayTraversalData> tStack;
3350
3351	float mint = 0.0f, maxt = 1.0f;
3352
3353	Intersectable::NewMail();
3354	ViewCell::NewMail();
3355
3356	Vector3 entp = origin;
3357	Vector3 extp = termination;
3358
3359	BspNode *node = mRoot;
3360	BspNode *farChild = NULL;
3361
3362	float t;
3363	const float thresh = 1e-6f; // matt: change this to adjustable value
3364
3365	while (1)
3366	{
3367	if (!node->IsLeaf())
3368	{
3369	BspInterior in = dynamic_cast<BspInterior >(node);
3370
3371	Plane3 splitPlane = in->GetPlane();
3372
3373	const int entSide = splitPlane.Side(entp, thresh);
3374	const int extSide = splitPlane.Side(extp, thresh);
3375
3376	if (entSide < 0)
3377	{
3378	node = in->GetBack();
3379
3380	// plane does not split ray => no far child
3381	if (extSide <= 0)
3382	continue;
3383
3384	farChild = in->GetFront(); // plane splits ray
3385	}
3386	else if (entSide > 0)
3387	{
3388	node = in->GetFront();
3389
3390	if (extSide >= 0) // plane does not split ray => no far child
3391	continue;
3392
3393	farChild = in->GetBack(); // plane splits ray
3394	}
3395	else // one of the ray end points is on the plane
3396	{ // NOTE: what to do if ray is coincident with plane?
3397	if (extSide < 0)
3398	node = in->GetBack();
3399	else //if (extSide > 0)
3400	node = in->GetFront();
3401	//else break; // coincident => count no intersections
3402
3403	continue; // no far child
3404	}
3405
3406	// push data for far child
3407	tStack.push(BspRayTraversalData(farChild, extp));
3408
3409	// find intersection of ray segment with plane
3410	extp = splitPlane.FindIntersection(origin, extp, &t);
3411	}
3412	else
3413	{
3414	// reached leaf => intersection with view cell
3415	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3416	ViewCell *viewCell;
3417
3418	if (0)
3419	viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3420	else
3421	viewCell = leaf->GetViewCell();
3422
3423	if (!viewCell->Mailed())
3424	{
3425	viewcells.push_back(viewCell);
3426	viewCell->Mail();
3427	++ hits;
3428	}
3429
3430	//-- fetch the next far child from the stack
3431	if (tStack.empty())
3432	break;
3433
3434	entp = extp;
3435
3436	const BspRayTraversalData &s = tStack.top();
3437
3438	node = s.mNode;
3439	extp = s.mExitPoint;
3440
3441	tStack.pop();
3442	}
3443	}
3444
3445	return hits;
3446	}
3447
3448
3449
3450
3451	int FromPointVisibilityTree::TreeDistance(BspNode n1, BspNode n2) const
3452	{
3453	std::deque<BspNode *> path1;
3454	BspNode *p1 = n1;
3455
3456	// create path from node 1 to root
3457	while (p1)
3458	{
3459	if (p1 == n2) // second node on path
3460	return (int)path1.size();
3461
3462	path1.push_front(p1);
3463	p1 = p1->GetParent();
3464	}
3465
3466	int depth = n2->GetDepth();
3467	int d = depth;
3468
3469	BspNode *p2 = n2;
3470
3471	// compare with same depth
3472	while (1)
3473	{
3474	if ((d < (int)path1.size()) && (p2 == path1[d]))
3475	return (depth - d) + ((int)path1.size() - 1 - d);
3476
3477	-- d;
3478	p2 = p2->GetParent();
3479	}
3480
3481	return 0; // never come here
3482	}
3483
3484
3485	BspNode FromPointVisibilityTree::CollapseTree(BspNode node, int &collapsed)
3486	{
3487	// TODO
3488	#if HAS_TO_BE_REDONE
3489	if (node->IsLeaf())
3490	return node;
3491
3492	BspInterior interior = dynamic_cast<BspInterior >(node);
3493
3494	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
3495	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
3496
3497	if (front->IsLeaf() && back->IsLeaf())
3498	{
3499	BspLeaf frontLeaf = dynamic_cast<BspLeaf >(front);
3500	BspLeaf backLeaf = dynamic_cast<BspLeaf >(back);
3501
3502	//-- collapse tree
3503	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
3504	{
3505	BspViewCell *vc = frontLeaf->GetViewCell();
3506
3507	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
3508	leaf->SetTreeValid(frontLeaf->TreeValid());
3509
3510	// replace a link from node's parent
3511	if (leaf->GetParent())
3512	leaf->GetParent()->ReplaceChildLink(node, leaf);
3513	else
3514	mRoot = leaf;
3515
3516	++ collapsed;
3517	delete interior;
3518
3519	return leaf;
3520	}
3521	}
3522	#endif
3523	return node;
3524	}
3525
3526
3527	int FromPointVisibilityTree::CollapseTree()
3528	{
3529	int collapsed = 0;
3530	//TODO
3531	#if HAS_TO_BE_REDONE
3532	(void)CollapseTree(mRoot, collapsed);
3533
3534	// revalidate leaves
3535	RepairViewCellsLeafLists();
3536	#endif
3537	return collapsed;
3538	}
3539
3540
3541	void FromPointVisibilityTree::RepairViewCellsLeafLists()
3542	{
3543	// TODO
3544	#if HAS_TO_BE_REDONE
3545	// list not valid anymore => clear
3546	stack<BspNode *> nodeStack;
3547	nodeStack.push(mRoot);
3548
3549	ViewCell::NewMail();
3550
3551	while (!nodeStack.empty())
3552	{
3553	BspNode *node = nodeStack.top();
3554	nodeStack.pop();
3555
3556	if (node->IsLeaf())
3557	{
3558	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3559
3560	BspViewCell *viewCell = leaf->GetViewCell();
3561
3562	if (!viewCell->Mailed())
3563	{
3564	viewCell->mLeaves.clear();
3565	viewCell->Mail();
3566	}
3567
3568	viewCell->mLeaves.push_back(leaf);
3569
3570	}
3571	else
3572	{
3573	BspInterior interior = dynamic_cast<BspInterior >(node);
3574
3575	nodeStack.push(interior->GetFront());
3576	nodeStack.push(interior->GetBack());
3577	}
3578	}
3579	// TODO
3580	#endif
3581	}
3582
3583
3584	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
3585
3586
3587	int FromPointVisibilityTree::CastBeam(Beam &beam)
3588	{
3589	stack<bspNodePair> nodeStack;
3590	BspNodeGeometry *rgeom = new BspNodeGeometry();
3591	ConstructGeometry(mRoot, *rgeom);
3592
3593	nodeStack.push(bspNodePair(mRoot, rgeom));
3594
3595	ViewCell::NewMail();
3596
3597	while (!nodeStack.empty())
3598	{
3599	BspNode *node = nodeStack.top().first;
3600	BspNodeGeometry *geom = nodeStack.top().second;
3601	nodeStack.pop();
3602
3603	AxisAlignedBox3 box;
3604	geom->GetBoundingBox(box);
3605
3606	const int side = beam.ComputeIntersection(box);
3607
3608	switch (side)
3609	{
3610	case -1:
3611	CollectViewCells(node, true, beam.mViewCells, true);
3612	break;
3613	case 0:
3614
3615	if (node->IsLeaf())
3616	{
3617	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3618
3619	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
3620	{
3621	leaf->GetViewCell()->Mail();
3622	beam.mViewCells.push_back(leaf->GetViewCell());
3623	}
3624	}
3625	else
3626	{
3627	BspInterior interior = dynamic_cast<BspInterior >(node);
3628
3629	BspNode *first = interior->GetFront();
3630	BspNode *second = interior->GetBack();
3631
3632	BspNodeGeometry *firstGeom = new BspNodeGeometry();
3633	BspNodeGeometry *secondGeom = new BspNodeGeometry();
3634
3635	geom->SplitGeometry(*firstGeom,
3636	*secondGeom,
3637	interior->GetPlane(),
3638	mBox,
3639	//0.0000001f);
3640	mEpsilon);
3641
3642	// decide on the order of the nodes
3643	if (DotProd(beam.mPlanes[0].mNormal,
3644	interior->GetPlane().mNormal) > 0)
3645	{
3646	swap(first, second);
3647	swap(firstGeom, secondGeom);
3648	}
3649
3650	nodeStack.push(bspNodePair(first, firstGeom));
3651	nodeStack.push(bspNodePair(second, secondGeom));
3652	}
3653
3654	break;
3655	default:
3656	// default: cull
3657	break;
3658	}
3659
3660	DEL_PTR(geom);
3661
3662	}
3663
3664	return (int)beam.mViewCells.size();
3665	}
3666
3667
3668	void FromPointVisibilityTree::SetViewCellsManager(ViewCellsManager *vcm)
3669	{
3670	mViewCellsManager = vcm;
3671	}
3672
3673
3674	int FromPointVisibilityTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
3675	vector<MergeCandidate> &candidates)
3676	{
3677	BspLeaf::NewMail();
3678
3679	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
3680
3681	int numCandidates = 0;
3682
3683	// find merge candidates and push them into queue
3684	for (it = leaves.begin(); it != it_end; ++ it)
3685	{
3686	BspLeaf leaf = it;
3687
3688	// the same leaves must not be part of two merge candidates
3689	leaf->Mail();
3690
3691	vector<BspLeaf *> neighbors;
3692
3693	// appoximate neighbor search has slightl relaxed constraints
3694	if (1)
3695	FindNeighbors(leaf, neighbors, true);
3696	else
3697	FindApproximateNeighbors(leaf, neighbors, true);
3698
3699	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
3700
3701	// TODO: test if at least one ray goes from one leaf to the other
3702	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
3703	{
3704	if ((*nit)->GetViewCell() != leaf->GetViewCell())
3705	{
3706	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
3707
3708	if (!leaf->GetViewCell()->GetPvs().Empty() \|\|
3709	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
3710	leaf->IsSibling(*nit))
3711	{
3712	candidates.push_back(mc);
3713	}
3714
3715	++ numCandidates;
3716	if ((numCandidates % 1000) == 0)
3717	{
3718	cout << "collected " << numCandidates << " merge candidates" << endl;
3719	}
3720	}
3721	}
3722	}
3723
3724	Debug << "merge queue: " << (int)candidates.size() << endl;
3725	Debug << "leaves in queue: " << numCandidates << endl;
3726
3727
3728	return (int)leaves.size();
3729	}
3730
3731
3732	int FromPointVisibilityTree::CollectMergeCandidates(const VssRayContainer &rays,
3733	vector<MergeCandidate> &candidates)
3734	{
3735	ViewCell::NewMail();
3736	long startTime = GetTime();
3737
3738	map<BspLeaf , vector<BspLeaf> > neighborMap;
3739	ViewCellContainer::const_iterator iit;
3740
3741	int numLeaves = 0;
3742
3743	BspLeaf::NewMail();
3744
3745	for (int i = 0; i < (int)rays.size(); ++ i)
3746	{
3747	VssRay *ray = rays[i];
3748
3749	// traverse leaves stored in the rays and compare and
3750	// merge consecutive leaves (i.e., the neighbors in the tree)
3751	if (ray->mViewCells.size() < 2)
3752	continue;
3753	//TODO viewcellhierarchy
3754	iit = ray->mViewCells.begin();
3755	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
3756	BspLeaf *leaf = bspVc->mLeaf;
3757
3758	// traverse intersections
3759	// consecutive leaves are neighbors => add them to queue
3760	for (; iit != ray->mViewCells.end(); ++ iit)
3761	{
3762	// next pair
3763	BspLeaf *prevLeaf = leaf;
3764	bspVc = dynamic_cast<BspViewCell >(iit);
3765	leaf = bspVc->mLeaf;
3766
3767	// view space not valid or same view cell
3768	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3769	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3770	continue;
3771
3772	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3773
3774	bool found = false;
3775
3776	// both leaves inserted in queue already =>
3777	// look if double pair already exists
3778	if (leaf->Mailed() && prevLeaf->Mailed())
3779	{
3780	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3781
3782	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3783	if (*it == prevLeaf)
3784	found = true; // already in queue
3785	}
3786
3787	if (!found)
3788	{
3789	// this pair is not in map yet
3790	// => insert into the neighbor map and the queue
3791	neighbors.push_back(prevLeaf);
3792	neighborMap[prevLeaf].push_back(leaf);
3793
3794	leaf->Mail();
3795	prevLeaf->Mail();
3796
3797	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3798
3799	candidates.push_back(mc);
3800
3801	if (((int)candidates.size() % 1000) == 0)
3802	{
3803	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3804	}
3805	}
3806	}
3807	}
3808
3809	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3810	Debug << "merge queue: " << (int)candidates.size() << endl;
3811	Debug << "leaves in queue: " << numLeaves << endl;
3812
3813
3814	//-- collect the leaves which haven't been found by ray casting
3815	if (0)
3816	{
3817	cout << "finding additional merge candidates using geometry" << endl;
3818	vector<BspLeaf *> leaves;
3819	CollectLeaves(leaves, true);
3820	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3821	CollectMergeCandidates(leaves, candidates);
3822	}
3823
3824	return numLeaves;
3825	}
3826
3827
3828
3829
3830	ViewCell *FromPointVisibilityTree::GetViewCell(const Vector3 &point)
3831	{
3832	if (mRoot == NULL)
3833	return NULL;
3834
3835	stack<BspNode *> nodeStack;
3836	nodeStack.push(mRoot);
3837
3838	ViewCell *viewcell = NULL;
3839
3840	while (!nodeStack.empty()) {
3841	BspNode *node = nodeStack.top();
3842	nodeStack.pop();
3843
3844	if (node->IsLeaf()) {
3845	viewcell = dynamic_cast<BspLeaf *>(node)->GetViewCell();
3846	break;
3847	} else {
3848
3849	BspInterior interior = dynamic_cast<BspInterior >(node);
3850
3851	// random decision
3852	if (interior->GetPlane().Side(point) < 0)
3853	nodeStack.push(interior->GetBack());
3854	else
3855	nodeStack.push(interior->GetFront());
3856	}
3857	}
3858
3859	return viewcell;
3860	}
3861
3862
3863	bool FromPointVisibilityTree::ViewPointValid(const Vector3 &viewPoint) const
3864	{
3865	BspNode *node = mRoot;
3866
3867	while (1)
3868	{
3869	// early exit
3870	if (node->TreeValid())
3871	return true;
3872
3873	if (node->IsLeaf())
3874	return false;
3875
3876	BspInterior in = dynamic_cast<BspInterior >(node);
3877
3878	if (in->GetPlane().Side(viewPoint) <= 0)
3879	{
3880	node = in->GetBack();
3881	}
3882	else
3883	{
3884	node = in->GetFront();
3885	}
3886	}
3887
3888	// should never come here
3889	return false;
3890	}
3891
3892
3893	void FromPointVisibilityTree::PropagateUpValidity(BspNode *node)
3894	{
3895	const bool isValid = node->TreeValid();
3896
3897	// propagative up invalid flag until only invalid nodes exist over this node
3898	if (!isValid)
3899	{
3900	while (!node->IsRoot() && node->GetParent()->TreeValid())
3901	{
3902	node = node->GetParent();
3903	node->SetTreeValid(false);
3904	}
3905	}
3906	else
3907	{
3908	// propagative up valid flag until one of the subtrees is invalid
3909	while (!node->IsRoot() && !node->TreeValid())
3910	{
3911	node = node->GetParent();
3912	BspInterior interior = dynamic_cast<BspInterior >(node);
3913
3914	// the parent is valid iff both leaves are valid
3915	node->SetTreeValid(interior->GetBack()->TreeValid() &&
3916	interior->GetFront()->TreeValid());
3917	}
3918	}
3919	}
3920
3921
3922	bool FromPointVisibilityTree::Export(ofstream &stream)
3923	{
3924	ExportNode(mRoot, stream);
3925
3926	return true;
3927	}
3928
3929
3930	void FromPointVisibilityTree::ExportNode(BspNode *node, ofstream &stream)
3931	{
3932	if (node->IsLeaf())
3933	{
3934	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3935	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3936
3937	int id = -1;
3938	if (viewCell != mOutOfBoundsCell)
3939	id = viewCell->GetId();
3940
3941	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
3942	}
3943	else
3944	{
3945	BspInterior interior = dynamic_cast<BspInterior >(node);
3946
3947	Plane3 plane = interior->GetPlane();
3948	stream << "<Interior plane=\"" << plane.mNormal.x << " "
3949	<< plane.mNormal.y << " " << plane.mNormal.z << " "
3950	<< plane.mD << "\">" << endl;
3951
3952	ExportNode(interior->GetBack(), stream);
3953	ExportNode(interior->GetFront(), stream);
3954
3955	stream << "</Interior>" << endl;
3956	}
3957	}
3958
3959	}

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