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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 2347

Revision 2347, 98.6 KB checked in by mattausch, 18 years ago (diff)
debug version

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1	#include <stack>
2	#include <time.h>
3	#include <iomanip>
4
5	#include "Plane3.h"
6	#include "VspBspTree.h"
7	#include "Mesh.h"
8	#include "common.h"
9	#include "ViewCell.h"
10	#include "Environment.h"
11	#include "Polygon3.h"
12	#include "Ray.h"
13	#include "AxisAlignedBox3.h"
14	#include "Exporter.h"
15	#include "Plane3.h"
16	#include "ViewCellBsp.h"
17	#include "ViewCellsManager.h"
18	#include "Beam.h"
19	#include "IntersectableWrapper.h"
20
21
22
23	namespace GtpVisibilityPreprocessor {
24
25
26	#define USE_FIXEDPOINT_T 0
27	#define COUNT_ORIGIN_OBJECTS 1
28
29	#define STORE_PVS 0
30
31
32	//////////////
33	//-- static members
34
35	int VspBspTree::sFrontId = 0;
36	int VspBspTree::sBackId = 0;
37	int VspBspTree::sFrontAndBackId = 0;
38
39
40
41	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
42
43
44	// pvs penalty can be different from pvs size
45	inline static float EvalPvsPenalty(const float pvs,
46	const float lower,
47	const float upper)
48	{
49	// clamp to minmax values
50	if (pvs < lower)
51	return (float)lower;
52	if (pvs > upper)
53	return (float)upper;
54
55	return (float)pvs;
56	}
57
58
59
60
61	/******************************************************************************/
62	/* class VspBspTree implementation */
63	/******************************************************************************/
64
65
66	VspBspTree::VspBspTree():
67	mRoot(NULL),
68	mUseAreaForPvs(false),
69	mCostNormalizer(Limits::Small),
70	mViewCellsManager(NULL),
71	mOutOfBoundsCell(NULL),
72	mStoreRays(false),
73	mRenderCostWeight(0.5),
74	mUseRandomAxis(false),
75	mTimeStamp(1)
76	{
77	bool randomize = false;
78	Environment::GetSingleton()->GetBoolValue("VspBspTree.Construction.randomize", randomize);
79	if (randomize) Randomize(); // initialise random generator for heuristics
80
81	//////////////////
82	//-- termination criteria for autopartition
83
84	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.maxDepth", mTermMaxDepth);
85	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.minPvs", mTermMinPvs);
86	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.minRays", mTermMinRays);
87	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minProbability", mTermMinProbability);
88	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.maxRayContribution", mTermMaxRayContribution);
89	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
90
91	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.missTolerance", mTermMissTolerance);
92	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.maxViewCells", mMaxViewCells);
93
94	////////////////////////
95	//-- cost ratios for early tree termination
96	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
97	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
98	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
99
100	///////////
101	//-- factors for bsp tree split plane heuristics
102
103	Environment::GetSingleton()->GetFloatValue("VspBspTree.Factor.pvs", mPvsFactor);
104	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.ct_div_ci", mCtDivCi);
105
106	//////////
107	//-- partition criteria
108
109	Environment::GetSingleton()->GetIntValue("VspBspTree.maxPolyCandidates", mMaxPolyCandidates);
110	Environment::GetSingleton()->GetIntValue("VspBspTree.maxRayCandidates", mMaxRayCandidates);
111	Environment::GetSingleton()->GetIntValue("VspBspTree.splitPlaneStrategy", mSplitPlaneStrategy);
112
113	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.epsilon", mEpsilon);
114	Environment::GetSingleton()->GetIntValue("VspBspTree.maxTests", mMaxTests);
115
116	// if only the driving axis is used for axis aligned split
117	Environment::GetSingleton()->GetBoolValue("VspBspTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
118
119	//////////////////////
120	//-- termination criteria for axis aligned split
121	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
122	mTermMaxRayContriForAxisAligned);
123	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
124	mTermMinRaysForAxisAligned);
125
126	Environment::GetSingleton()->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
127
128	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
129	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
130	Environment::GetSingleton()->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
131
132	Environment::GetSingleton()->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
133	Environment::GetSingleton()->GetBoolValue("VspBspTree.useSplitCostQueue", mUseSplitCostQueue);
134	Environment::GetSingleton()->GetBoolValue("VspBspTree.simulateOctree", mCirculatingAxis);
135	Environment::GetSingleton()->GetBoolValue("VspBspTree.useRandomAxis", mUseRandomAxis);
136	Environment::GetSingleton()->GetIntValue("VspBspTree.nodePriorityQueueType", mNodePriorityQueueType);
137
138
139	char subdivisionStatsLog[100];
140	Environment::GetSingleton()->GetStringValue("VspBspTree.subdivisionStats", subdivisionStatsLog);
141	mSubdivisionStats.open(subdivisionStatsLog);
142
143	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.minBand", mMinBand);
144	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.maxBand", mMaxBand);
145	Environment::GetSingleton()->GetBoolValue("VspBspTree.Construction.useDrivingAxisForMaxCost", mUseDrivingAxisIfMaxCostViolated);
146
147	/////////
148	//-- debug output
149
150	Debug << "***** VSP BSP options ****** " << endl;
151	Debug << "max depth: " << mTermMaxDepth << endl;
152	Debug << "min PVS: " << mTermMinPvs << endl;
153	Debug << "min probabiliy: " << mTermMinProbability << endl;
154	Debug << "min rays: " << mTermMinRays << endl;
155	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
156	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
157	Debug << "miss tolerance: " << mTermMissTolerance << endl;
158	Debug << "max view cells: " << mMaxViewCells << endl;
159	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
160	Debug << "randomize: " << randomize << endl;
161
162	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
163	Debug << "render cost weight: " << mRenderCostWeight << endl;
164	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
165	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
166	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
167	Debug << "max memory: " << mMaxMemory << endl;
168	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
169	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
170	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
171	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
172	Debug << "use random axis: " << mUseRandomAxis << endl;
173	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
174	Debug << "circulating axis: " << mCirculatingAxis << endl;
175	Debug << "minband: " << mMinBand << endl;
176	Debug << "maxband: " << mMaxBand << endl;
177	Debug << "use driving axis for max cost: " << mUseDrivingAxisIfMaxCostViolated << endl;
178	Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
179
180	Debug << "Split plane strategy: ";
181
182	if (mSplitPlaneStrategy & RANDOM_POLYGON)
183	{
184	Debug << "random polygon ";
185	}
186	if (mSplitPlaneStrategy & AXIS_ALIGNED)
187	{
188	Debug << "axis aligned ";
189	}
190	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
191	{
192	mCostNormalizer += mLeastRaySplitsFactor;
193	Debug << "least ray splits ";
194	}
195	if (mSplitPlaneStrategy & BALANCED_RAYS)
196	{
197	mCostNormalizer += mBalancedRaysFactor;
198	Debug << "balanced rays ";
199	}
200	if (mSplitPlaneStrategy & PVS)
201	{
202	mCostNormalizer += mPvsFactor;
203	Debug << "pvs";
204	}
205
206	Debug << endl;
207
208	mLocalSubdivisionCandidates = new vector<SortableEntry>;
209	}
210
211
212	BspViewCell *VspBspTree::GetOutOfBoundsCell()
213	{
214	return mOutOfBoundsCell;
215	}
216
217
218	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
219	{
220	if (!mOutOfBoundsCell)
221	{
222	mOutOfBoundsCell = new BspViewCell();
223	mOutOfBoundsCell->SetId(OUT_OF_BOUNDS_ID);
224	mOutOfBoundsCell->SetValid(false);
225	}
226
227	return mOutOfBoundsCell;
228	}
229
230
231	const BspTreeStatistics &VspBspTree::GetStatistics() const
232	{
233	return mBspStats;
234	}
235
236
237	VspBspTree::~VspBspTree()
238	{
239	DEL_PTR(mRoot);
240	DEL_PTR(mLocalSubdivisionCandidates);
241	}
242
243
244	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
245	PolygonContainer &polys) const
246	{
247	if (!mesh) return 0;
248
249	FaceContainer::const_iterator fi;
250
251	// copy the face data to polygons
252	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
253	{
254	Polygon3 poly = new Polygon3((fi), mesh);
255
256	if (poly->Valid(mEpsilon))
257	{
258	polys.push_back(poly);
259	}
260	else
261	{
262	DEL_PTR(poly);
263	}
264	}
265
266	return (int)mesh->mFaces.size();
267	}
268
269
270	void VspBspTree::ExtractPolygons(Intersectable *object, PolygonContainer &polys) const
271	{
272	// extract the polygons from the intersectables
273	switch (object->Type())
274	{
275	case Intersectable::MESH_INSTANCE:
276	{
277	Mesh mesh = static_cast<MeshInstance >(object)->GetMesh();
278	AddMeshToPolygons(mesh, polys);
279	}
280	break;
281	case Intersectable::VIEW_CELL:
282	{
283	Mesh mesh = static_cast<ViewCell >(object)->GetMesh();
284	AddMeshToPolygons(mesh, polys);
285	break;
286	}
287	case Intersectable::TRANSFORMED_MESH_INSTANCE:
288	{
289	TransformedMeshInstance *mi =
290	static_cast<TransformedMeshInstance *>(object);
291
292	Mesh mesh;
293	mi->GetTransformedMesh(mesh);
294	AddMeshToPolygons(&mesh, polys);
295	}
296	break;
297	case Intersectable::TRIANGLE_INTERSECTABLE:
298	{
299	TriangleIntersectable *intersect =
300	static_cast<TriangleIntersectable *>(object);
301
302	Polygon3 *poly = new Polygon3(intersect->GetItem());
303
304	if (poly->Valid(mEpsilon))
305	{
306	polys.push_back(poly);
307	}
308	else
309	{
310	delete poly;
311	}
312	}
313	break;
314	default:
315	Debug << "intersectable type not supported" << endl;
316	break;
317	}
318	}
319
320
321	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
322	PolygonContainer &polys,
323	int maxObjects)
324	{
325	const int limit = (maxObjects > 0) ?
326	Min((int)objects.size(), maxObjects) : (int)objects.size();
327
328	for (int i = 0; i < limit; ++i)
329	{
330	Intersectable object = objects[i];//it;
331	ExtractPolygons(object, polys);
332
333	// add to BSP tree aabb
334	mBoundingBox.Include(object->GetBox());
335	}
336
337	return (int)polys.size();
338	}
339
340
341	void VspBspTree::ComputeBoundingBox(const VssRayContainer &sampleRays,
342	AxisAlignedBox3 *forcedBoundingBox)
343	{
344	if (forcedBoundingBox)
345	{
346	mBoundingBox = *forcedBoundingBox;
347	}
348	else // compute vsp tree bounding box
349	{
350	mBoundingBox.Initialize();
351
352	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
353
354	//-- compute bounding box
355	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
356	{
357	VssRay ray = rit;
358
359	// compute bounding box of view space
360	mBoundingBox.Include(ray->GetTermination());
361	mBoundingBox.Include(ray->GetOrigin());
362	}
363	}
364	}
365
366
367	void VspBspTree::Construct(const VssRayContainer &sampleRays,
368	AxisAlignedBox3 *forcedBoundingBox)
369	{
370	// Compute the bounding box from the rays
371	ComputeBoundingBox(sampleRays, forcedBoundingBox);
372
373	PolygonContainer polys;
374	RayInfoContainer *rays = new RayInfoContainer();
375
376	////////////
377	//-- extract polygons from rays if polygon candidate planes are required
378
379	if (mMaxPolyCandidates)
380	{
381	int numObj = 0;
382	Intersectable::NewMail();
383
384	cout << "Extracting polygons from rays ... ";
385	const long startTime = GetTime();
386
387	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
388
389	//-- extract polygons intersected by the rays
390	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
391	{
392	VssRay ray = rit;
393	Intersectable *obj = ray->mTerminationObject;
394
395	++ numObj;
396
397	/////////
398	//-- compute bounding box
399
400	if (!forcedBoundingBox)
401	{
402	mBoundingBox.Include(ray->mTermination);
403	}
404
405	if ((mBoundingBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
406	ray->mOriginObject &&
407	!ray->mOriginObject->Mailed())
408	{
409	ray->mOriginObject->Mail();
410	ExtractPolygons(ray->mOriginObject, polys);
411
412	++ numObj;
413	}
414	}
415
416	// throw out unnecessary polygons
417	PreprocessPolygons(polys);
418	cout << "finished" << endl;
419
420	Debug << "\n" << (int)polys.size() << " polys extracted from "
421	<< (int)sampleRays.size() << " rays in "
422	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
423	}
424
425	Debug << "maximal pvs (i.e., pvs still considered as valid): "
426	<< mViewCellsManager->GetMaxPvsSize() << endl;
427
428	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
429
430	/////////
431	//-- store rays
432	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
433	{
434	VssRay ray = rit;
435
436	float minT, maxT;
437
438	static Ray hray;
439	hray.Init(*ray);
440
441	// TODO: not very efficient to implictly cast between rays types
442	if (mBoundingBox.GetRaySegment(hray, minT, maxT))
443	{
444	float len = ray->Length();
445
446	if (!len)
447	len = Limits::Small;
448
449	rays->push_back(RayInfo(ray, minT / len, maxT / len));
450	}
451	}
452
453	if (mUseAreaForPvs)
454	mTermMinProbability *= mBoundingBox.SurfaceArea();
455	else // normalize volume
456	mTermMinProbability *= mBoundingBox.GetVolume();
457
458	mBspStats.nodes = 1;
459	mBspStats.polys = (int)polys.size();
460	mBspStats.mGlobalCostMisses = 0;
461
462
463	// use split cost priority queue
464	if (mUseSplitCostQueue)
465	{
466	ConstructWithSplitQueue(polys, rays);
467	}
468	else
469	{
470	Construct(polys, rays);
471	}
472
473	// clean up polygons
474	CLEAR_CONTAINER(polys);
475	}
476
477
478	// TODO: return memory usage in MB
479	float VspBspTree::GetMemUsage() const
480	{
481	return (float)
482	(sizeof(VspBspTree) +
483	mBspStats.Leaves() * sizeof(BspLeaf) +
484	mCreatedViewCells * sizeof(BspViewCell) +
485	mBspStats.pvs * sizeof(PvsData) +
486	mBspStats.Interior() * sizeof(BspInterior) +
487	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
488	}
489
490
491	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
492	{
493	VspBspTraversalQueue tQueue;
494
495	/// create new vsp tree
496	mRoot = new BspLeaf();
497
498	// constrruct root node geometry
499	BspNodeGeometry *geom = new BspNodeGeometry();
500	ConstructGeometry(mRoot, *geom);
501
502	/// we use the overall probability as normalizer
503	/// either the overall area or the volume
504	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
505
506	/// first traversal data
507	VspBspTraversalData tData(mRoot,
508	new PolygonContainer(polys),
509	0,
510	rays,
511	ComputePvsSize(*rays),
512	prop,
513	geom);
514
515	// evaluate the priority of this traversal data
516	EvalPriority(tData);
517
518	// first node is kd node, i.e. an axis aligned box
519	if (1)
520	tData.mIsKdNode = true;
521	else
522	tData.mIsKdNode = false;
523
524	tQueue.push(tData);
525
526
527	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
528	mTotalPvsSize = tData.mPvs;
529
530	// first subdivison statistics
531	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
532
533	mBspStats.Start();
534	cout << "Constructing vsp bsp tree ... \n";
535
536	const long startTime = GetTime();
537	// used for intermediate time measurements and progress
538	long interTime = GetTime();
539
540	int nLeaves = 500;
541	int nViewCells = 500;
542
543	mOutOfMemory = false;
544	mCreatedViewCells = 0;
545
546	while (!tQueue.empty())
547	{
548	tData = tQueue.top();
549	tQueue.pop();
550
551	if (0 && !mOutOfMemory)
552	{
553	float mem = GetMemUsage();
554
555	if (mem > mMaxMemory)
556	{
557	mOutOfMemory = true;
558	Debug << "memory limit reached: " << mem << endl;
559	}
560	}
561
562	// subdivide leaf node
563	const BspNode *r = Subdivide(tQueue, tData);
564
565	if (r == mRoot)
566	Debug << "VSP BSP tree construction time spent at root: "
567	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
568
569	if (mBspStats.Leaves() >= nLeaves)
570	{
571	nLeaves += 500;
572
573	cout << "leaves=" << mBspStats.Leaves() << endl;
574	Debug << "needed "
575	<< TimeDiff(interTime, GetTime())*1e-3
576	<< " secs to create 500 view cells" << endl;
577	interTime = GetTime();
578	}
579
580	if (mCreatedViewCells >= nViewCells)
581	{
582	nViewCells += 500;
583
584	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
585	}
586	}
587
588	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
589	cout << "finished in " << TimeDiff(startTime, GetTime())*1e-3 << "secs" << endl;
590
591	mBspStats.Stop();
592	}
593
594
595
596	void VspBspTree::ConstructWithSplitQueue(const PolygonContainer &polys,
597	RayInfoContainer *rays)
598	{
599	VspBspSplitQueue tQueue;
600
601	mRoot = new BspLeaf();
602
603	// constrruct root node geometry
604	BspNodeGeometry *geom = new BspNodeGeometry();
605	ConstructGeometry(mRoot, *geom);
606
607	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
608
609	VspBspTraversalData tData(mRoot,
610	new PolygonContainer(polys),
611	0,
612	rays,
613	ComputePvsSize(*rays),
614	prop,
615	geom);
616
617
618	// first node is kd node, i.e. an axis aligned box
619	if (1)
620	tData.mIsKdNode = true;
621	else
622	tData.mIsKdNode = false;
623
624	// compute first split candidate
625	VspBspSubdivisionCandidate splitCandidate;
626	splitCandidate.mParentData = tData;
627
628	EvalSubdivisionCandidate(splitCandidate);
629
630	tQueue.push(splitCandidate);
631
632	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
633	mTotalPvsSize = tData.mPvs;
634
635	// first subdivison statistics
636	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
637
638	mBspStats.Start();
639	cout << "Constructing vsp bsp tree ... \n";
640
641	long startTime = GetTime();
642	int nLeaves = 500;
643	int nViewCells = 500;
644
645	// used for intermediate time measurements and progress
646	long interTime = GetTime();
647
648	mOutOfMemory = false;
649
650	mCreatedViewCells = 0;
651
652	while (!tQueue.empty())
653	{
654	splitCandidate = tQueue.top();
655	tQueue.pop();
656
657	// cost ratio of cost decrease / totalCost
658	float costRatio = splitCandidate.mRenderCostDecr / mTotalCost;
659
660	//Debug << "cost ratio: " << costRatio << endl;
661	if (costRatio < mTermMinGlobalCostRatio)
662	{
663	++ mBspStats.mGlobalCostMisses;
664	}
665
666	if (0 && !mOutOfMemory)
667	{
668	float mem = GetMemUsage();
669	if (mem > mMaxMemory)
670	{
671	mOutOfMemory = true;
672	Debug << "memory limit reached: " << mem << endl;
673	}
674	}
675
676	// subdivide leaf node
677	BspNode *r = Subdivide(tQueue, splitCandidate);
678
679	if (r == mRoot)
680	{
681	cout << "VSP BSP tree construction time spent at root: "
682	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
683	}
684
685	if (mBspStats.Leaves() >= nLeaves)
686	{
687	nLeaves += 500;
688
689	cout << "leaves=" << mBspStats.Leaves() << endl;
690	Debug << "needed "
691	<< TimeDiff(interTime, GetTime())*1e-3
692	<< " secs to create 500 view cells" << endl;
693	interTime = GetTime();
694	}
695
696	if (mCreatedViewCells == nViewCells)
697	{
698	nViewCells += 500;
699	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
700	}
701	}
702
703	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
704	cout << "finished\n";
705
706	mBspStats.Stop();
707	}
708
709
710	bool VspBspTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
711	{
712	return
713	(((int)data.mRays->size() <= mTermMinRays) \|\|
714	(data.mPvs <= mTermMinPvs) \|\|
715	(data.mProbability <= mTermMinProbability) \|\|
716	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
717	(data.mDepth >= mTermMaxDepth));
718	}
719
720
721	void VspBspTree::AddSubdivisionStats(const int viewCells,
722	const float renderCostDecr,
723	const float splitCandidateCost,
724	const float totalRenderCost,
725	const float avgRenderCost)
726	{
727	mSubdivisionStats
728	<< "#ViewCells\n" << viewCells << endl
729	<< "#RenderCostDecrease\n" << renderCostDecr << endl
730	<< "#SubdivisionCandidateCost\n" << splitCandidateCost << endl
731	<< "#TotalRenderCost\n" << totalRenderCost << endl
732	<< "#AvgRenderCost\n" << avgRenderCost << endl;
733	}
734
735
736	bool VspBspTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
737	{
738	return
739	(0
740	\|\| mOutOfMemory
741	\|\| (mBspStats.Leaves() >= mMaxViewCells)
742	\|\| (mBspStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
743	);
744	}
745
746
747	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
748	VspBspTraversalData &tData)
749	{
750	BspNode *newNode = tData.mNode;
751
752	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
753	{
754	PolygonContainer coincident;
755
756	VspBspTraversalData tFrontData;
757	VspBspTraversalData tBackData;
758
759	// create new interior node and two leaf nodes
760	// or return leaf as it is (if maxCostRatio missed)
761	int splitAxis;
762	bool splitFurther = true;
763	int maxCostMisses = tData.mMaxCostMisses;
764
765	Plane3 splitPlane;
766	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
767
768	// choose next split plane
769	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
770	{
771	++ maxCostMisses;
772
773	if (maxCostMisses > mTermMissTolerance)
774	{
775	// terminate branch because of max cost
776	++ mBspStats.maxCostNodes;
777	splitFurther = false;
778	}
779	}
780
781	// if this a valid split => subdivide this node further
782
783	if (splitFurther)
784	{
785	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
786
787	if (splitAxis < 3)
788	++ mBspStats.splits[splitAxis];
789	else
790	++ mBspStats.polySplits;
791
792	// if it was a kd node (i.e., a box) and the split axis is axis aligned, it is still a kd node
793	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
794
795	tFrontData.mAxis = tBackData.mAxis = splitAxis;
796
797	// how often was max cost ratio missed in this branch?
798	tFrontData.mMaxCostMisses = maxCostMisses;
799	tBackData.mMaxCostMisses = maxCostMisses;
800
801	EvalPriority(tFrontData);
802	EvalPriority(tBackData);
803
804	// evaluate subdivision stats
805	if (1)
806	EvalSubdivisionStats(tData, tFrontData, tBackData);
807
808
809	// push the children on the stack
810	tQueue.push(tFrontData);
811	tQueue.push(tBackData);
812
813	// delete old leaf node
814	DEL_PTR(tData.mNode);
815	}
816	}
817
818	//-- terminate traversal and create new view cell
819	if (newNode->IsLeaf())
820	{
821	BspLeaf leaf = static_cast<BspLeaf >(newNode);
822
823	BspViewCell *viewCell = new BspViewCell();
824	leaf->SetViewCell(viewCell);
825
826	if (STORE_PVS)
827	{
828	//////////
829	//-- update pvs
830
831	int conSamp = 0;
832	float sampCon = 0.0f;
833
834	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
835
836	// update scalar pvs size lookup
837	ObjectPvs &pvs = viewCell->GetPvs();
838	mViewCellsManager->UpdateScalarPvsSize(viewCell, pvs.EvalPvsCost(), pvs.GetSize());
839
840	mBspStats.contributingSamples += conSamp;
841	mBspStats.sampleContributions += (int)sampCon;
842	}
843
844	//////////
845	//-- store additional info
846
847	if (mStoreRays)
848	{
849	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
850	for (it = tData.mRays->begin(); it != it_end; ++ it)
851	{
852	(*it).mRay->Ref();
853	leaf->mVssRays.push_back((*it).mRay);
854	}
855	}
856
857	// should I check here?
858	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0,
859	mViewCellsManager->GetMaxPvsSize()))
860	{
861	viewCell->SetValid(false);
862	leaf->SetTreeValid(false);
863	PropagateUpValidity(leaf);
864
865	++ mBspStats.invalidLeaves;
866	}
867
868	viewCell->mLeaves.push_back(leaf);
869
870	if (mUseAreaForPvs)
871	viewCell->SetArea(tData.mProbability);
872	else
873	viewCell->SetVolume(tData.mProbability);
874
875	leaf->mProbability = tData.mProbability;
876
877	// finally evaluate stats until this leaf
878	if (0)
879	EvaluateLeafStats(tData);
880	}
881
882	//-- cleanup
883	tData.Clear();
884
885	return newNode;
886	}
887
888
889	// subdivide node using a split plane queue
890	BspNode *VspBspTree::Subdivide(VspBspSplitQueue &tQueue,
891	VspBspSubdivisionCandidate &splitCandidate)
892	{
893	VspBspTraversalData &tData = splitCandidate.mParentData;
894
895	BspNode *newNode = tData.mNode;
896
897	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
898	{
899	PolygonContainer coincident;
900
901	VspBspTraversalData tFrontData;
902	VspBspTraversalData tBackData;
903
904	////////////////////
905	//-- continue subdivision
906
907	// create new interior node and two leaf node
908	const Plane3 splitPlane = splitCandidate.mSplitPlane;
909
910	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
911
912	const int splitAxis = splitCandidate.mSplitAxis;
913	const int maxCostMisses = splitCandidate.mMaxCostMisses;
914
915	if (splitAxis < 3)
916	++ mBspStats.splits[splitAxis];
917	else
918	++ mBspStats.polySplits;
919
920	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
921	tFrontData.mAxis = tBackData.mAxis = splitAxis;
922
923	// how often was max cost ratio missed in this branch?
924	tFrontData.mMaxCostMisses = maxCostMisses;
925	tBackData.mMaxCostMisses = maxCostMisses;
926
927	// statistics
928	if (1)
929	{
930	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
931	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
932	const float cData = (float)tData.mPvs * tData.mProbability;
933
934	const float costDecr =
935	(cFront + cBack - cData) / mBoundingBox.GetVolume();
936
937	mTotalCost += costDecr;
938	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
939
940	AddSubdivisionStats(mBspStats.Leaves(),
941	-costDecr,
942	splitCandidate.GetPriority(),
943	mTotalCost,
944	(float)mTotalPvsSize / (float)mBspStats.Leaves());
945	}
946
947	////////////
948	//-- push the new split candidates on the stack
949
950	VspBspSubdivisionCandidate frontCandidate;
951	frontCandidate.mParentData = tFrontData;
952
953	VspBspSubdivisionCandidate backCandidate;
954	backCandidate.mParentData = tBackData;
955
956	EvalSubdivisionCandidate(frontCandidate);
957	EvalSubdivisionCandidate(backCandidate);
958
959	cout << "f cost: " << frontCandidate.mPriority << " " << frontCandidate.mRenderCostDecr << endl;
960	cout << "b cost: " << backCandidate.mPriority << " " << backCandidate.mRenderCostDecr << endl;
961	tQueue.push(frontCandidate);
962	tQueue.push(backCandidate);
963
964	// delete old leaf node
965	DEL_PTR(tData.mNode);
966	}
967
968
969	//////////////////
970	//-- terminate traversal and create new view cell
971
972	if (newNode->IsLeaf())
973	{
974	BspLeaf leaf = static_cast<BspLeaf >(newNode);
975
976	BspViewCell *viewCell = new BspViewCell();
977	leaf->SetViewCell(viewCell);
978
979	if (STORE_PVS)
980	{
981	/////////
982	//-- update pvs
983
984	int conSamp = 0;
985	float sampCon = 0.0f;
986
987	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
988
989	// update scalar pvs size value
990	ObjectPvs &pvs = viewCell->GetPvs();
991	mViewCellsManager->UpdateScalarPvsSize(viewCell,
992	pvs.EvalPvsCost(),
993	pvs.GetSize());
994
995	mBspStats.contributingSamples += conSamp;
996	mBspStats.sampleContributions += (int)sampCon;
997	}
998
999	viewCell->mLeaves.push_back(leaf);
1000
1001	///////////
1002	//-- store additional info
1003
1004	if (mStoreRays)
1005	{
1006	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
1007	for (it = tData.mRays->begin(); it != it_end; ++ it)
1008	{
1009	(*it).mRay->Ref();
1010	leaf->mVssRays.push_back((*it).mRay);
1011	}
1012	}
1013
1014	if (mUseAreaForPvs)
1015	viewCell->SetArea(tData.mProbability);
1016	else
1017	viewCell->SetVolume(tData.mProbability);
1018
1019	leaf->mProbability = tData.mProbability;
1020
1021	// finally evaluate stats for this leaf
1022	if (1)
1023	EvaluateLeafStats(tData);
1024	}
1025
1026	//-- cleanup
1027	tData.Clear();
1028
1029	return newNode;
1030	}
1031
1032
1033	void VspBspTree::EvalPriority(VspBspTraversalData &tData) const
1034	{
1035	switch (mNodePriorityQueueType)
1036	{
1037	case BREATH_FIRST:
1038	tData.mPriority = (float)-tData.mDepth;
1039	break;
1040	case DEPTH_FIRST:
1041	tData.mPriority = (float)tData.mDepth;
1042	break;
1043	default:
1044	tData.mPriority = tData.mPvs * tData.mProbability;
1045	//Debug << "priority: " << tData.mPriority << endl;
1046	break;
1047	}
1048	}
1049
1050
1051	void VspBspTree::EvalSubdivisionCandidate(VspBspSubdivisionCandidate &splitCandidate)
1052	{
1053	VspBspTraversalData frontData;
1054	VspBspTraversalData backData;
1055
1056	BspLeaf leaf = static_cast<BspLeaf >(splitCandidate.mParentData.mNode);
1057
1058	// compute locally best split plane
1059	const bool costRatioViolated =
1060	SelectPlane(splitCandidate.mSplitPlane,
1061	leaf,
1062	splitCandidate.mParentData,
1063	frontData,
1064	backData,
1065	splitCandidate.mSplitAxis);
1066
1067	// max cost threshold violated?
1068	splitCandidate.mMaxCostMisses = costRatioViolated ? splitCandidate.mParentData.mMaxCostMisses :
1069	splitCandidate.mParentData.mMaxCostMisses + 1;
1070
1071	float oldRenderCost;
1072
1073	// compute global decrease in render cost
1074	const float renderCostDecr = EvalRenderCostDecrease(splitCandidate.mSplitPlane,
1075	splitCandidate.mParentData,
1076	oldRenderCost);
1077
1078	splitCandidate.mRenderCostDecr = renderCostDecr;
1079
1080	// TODO: geometry could be reused
1081	delete frontData.mGeometry;
1082	delete backData.mGeometry;
1083
1084	// set priority for queue
1085	#if 0
1086	const float priority = (float)-data.mDepth;
1087	#else
1088
1089	// take render cost of node into account
1090	// otherwise danger of being stuck in a local minimum!!
1091	const float factor = mRenderCostDecreaseWeight;
1092	const float priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
1093	#endif
1094
1095	splitCandidate.mPriority = priority;
1096	}
1097
1098
1099	void VspBspTree::EvalSubdivisionStats(const VspBspTraversalData &tData,
1100	const VspBspTraversalData &tFrontData,
1101	const VspBspTraversalData &tBackData)
1102	{
1103	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
1104	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
1105	const float cData = (float)tData.mPvs * tData.mProbability;
1106
1107	const float costDecr =
1108	(cFront + cBack - cData) / mBoundingBox.GetVolume();
1109
1110	mTotalCost += costDecr;
1111	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
1112
1113	AddSubdivisionStats(mBspStats.Leaves(),
1114	-costDecr,
1115	0,
1116	mTotalCost,
1117	(float)mTotalPvsSize / (float)mBspStats.Leaves());
1118	}
1119
1120
1121	BspInterior *VspBspTree::SubdivideNode(const Plane3 &splitPlane,
1122	VspBspTraversalData &tData,
1123	VspBspTraversalData &frontData,
1124	VspBspTraversalData &backData,
1125	PolygonContainer &coincident)
1126	{
1127	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
1128
1129	//-- the front and back traversal data is filled with the new values
1130	frontData.mDepth = tData.mDepth + 1;
1131	frontData.mPolygons = new PolygonContainer();
1132	frontData.mRays = new RayInfoContainer();
1133
1134	backData.mDepth = tData.mDepth + 1;
1135	backData.mPolygons = new PolygonContainer();
1136	backData.mRays = new RayInfoContainer();
1137
1138
1139	//-- subdivide rays
1140	SplitRays(splitPlane,
1141	*tData.mRays,
1142	*frontData.mRays,
1143	*backData.mRays);
1144
1145
1146	// compute pvs
1147	frontData.mPvs = ComputePvsSize(*frontData.mRays);
1148	backData.mPvs = ComputePvsSize(*backData.mRays);
1149
1150	// split front and back node geometry and compute area
1151
1152	// if geometry was not already computed
1153	if (!frontData.mGeometry && !backData.mGeometry)
1154	{
1155	frontData.mGeometry = new BspNodeGeometry();
1156	backData.mGeometry = new BspNodeGeometry();
1157
1158	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
1159	*backData.mGeometry,
1160	splitPlane,
1161	mBoundingBox,
1162	//0.0f);
1163	mEpsilon);
1164
1165	if (mUseAreaForPvs)
1166	{
1167	frontData.mProbability = frontData.mGeometry->GetArea();
1168	backData.mProbability = backData.mGeometry->GetArea();
1169	}
1170	else
1171	{
1172	frontData.mProbability = frontData.mGeometry->GetVolume();
1173	backData.mProbability = tData.mProbability - frontData.mProbability;
1174
1175	// should never come here: wrong volume !!!
1176	if (0)
1177	{
1178	if (frontData.mProbability < -0.00001)
1179	Debug << "fatal error f: " << frontData.mProbability << endl;
1180	if (backData.mProbability < -0.00001)
1181	Debug << "fatal error b: " << backData.mProbability << endl;
1182
1183	// clamp because of precision issues
1184	if (frontData.mProbability < 0) frontData.mProbability = 0;
1185	if (backData.mProbability < 0) backData.mProbability = 0;
1186	}
1187	}
1188	}
1189
1190
1191	// subdivide polygons
1192	SplitPolygons(splitPlane,
1193	*tData.mPolygons,
1194	*frontData.mPolygons,
1195	*backData.mPolygons,
1196	coincident);
1197
1198
1199
1200	///////////////////////////////////////
1201	// subdivide further
1202
1203	// store maximal and minimal depth
1204	if (tData.mDepth > mBspStats.maxDepth)
1205	{
1206	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
1207	mBspStats.maxDepth = tData.mDepth;
1208	}
1209
1210	mBspStats.nodes += 2;
1211
1212
1213	BspInterior *interior = new BspInterior(splitPlane);
1214
1215	#ifdef GTP_DEBUG
1216	Debug << interior << endl;
1217	#endif
1218
1219
1220	//-- create front and back leaf
1221
1222	BspInterior *parent = leaf->GetParent();
1223
1224	// replace a link from node's parent
1225	if (parent)
1226	{
1227	parent->ReplaceChildLink(leaf, interior);
1228	interior->SetParent(parent);
1229	}
1230	else // new root
1231	{
1232	mRoot = interior;
1233	}
1234
1235	// and setup child links
1236	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
1237
1238	frontData.mNode = interior->GetFront();
1239	backData.mNode = interior->GetBack();
1240
1241	interior->mTimeStamp = mTimeStamp ++;
1242
1243
1244	//DEL_PTR(leaf);
1245	return interior;
1246	}
1247
1248
1249	void VspBspTree::AddToPvs(BspLeaf *leaf,
1250	const RayInfoContainer &rays,
1251	float &sampleContributions,
1252	int &contributingSamples)
1253	{
1254	sampleContributions = 0;
1255	contributingSamples = 0;
1256
1257	RayInfoContainer::const_iterator it, it_end = rays.end();
1258
1259	ViewCellLeaf *vc = leaf->GetViewCell();
1260
1261	// add contributions from samples to the PVS
1262	for (it = rays.begin(); it != it_end; ++ it)
1263	{
1264	float sc = 0.0f;
1265	VssRay ray = (it).mRay;
1266
1267	bool madeContrib = false;
1268	float contribution;
1269
1270	if (ray->mTerminationObject)
1271	{
1272	if (vc->AddPvsSample(ray->mTerminationObject, ray->mPdf, contribution))
1273	madeContrib = true;
1274	sc += contribution;
1275	}
1276
1277	// only count termination objects?
1278	#if COUNT_ORIGIN_OBJECTS
1279
1280	if (ray->mOriginObject)
1281	{
1282	if (vc->AddPvsSample(ray->mOriginObject, ray->mPdf, contribution))
1283	madeContrib = true;
1284
1285	sc += contribution;
1286	}
1287	#endif
1288	sampleContributions += sc;
1289
1290	if (madeContrib)
1291	++ contributingSamples;
1292	}
1293	}
1294
1295
1296	void VspBspTree::SortSubdivisionCandidates(const RayInfoContainer &rays,
1297	const int axis,
1298	float minBand,
1299	float maxBand)
1300	{
1301	mLocalSubdivisionCandidates->clear();
1302
1303	const int requestedSize = 2 * (int)(rays.size());
1304
1305	// creates a sorted split candidates array
1306	if (mLocalSubdivisionCandidates->capacity() > 500000 &&
1307	requestedSize < (int)(mLocalSubdivisionCandidates->capacity() / 10) )
1308	{
1309	delete mLocalSubdivisionCandidates;
1310	mLocalSubdivisionCandidates = new vector<SortableEntry>;
1311	}
1312
1313	mLocalSubdivisionCandidates->reserve(requestedSize);
1314
1315	if (0)
1316	{ // float values => don't compare with exact values
1317	minBand += Limits::Small;
1318	maxBand -= Limits::Small;
1319	}
1320
1321	// insert all queries
1322	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
1323	{
1324	const bool positive = (*ri).mRay->HasPosDir(axis);
1325	float pos = (*ri).ExtrapOrigin(axis);
1326
1327	// clamp to min / max band
1328	if (0) ClipValue(pos, minBand, maxBand);
1329
1330	mLocalSubdivisionCandidates->
1331	push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
1332	pos, (*ri).mRay));
1333
1334	pos = (*ri).ExtrapTermination(axis);
1335
1336	// clamp to min / max band
1337	if (0) ClipValue(pos, minBand, maxBand);
1338
1339	mLocalSubdivisionCandidates->
1340	push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
1341	pos, (*ri).mRay));
1342	}
1343
1344	stable_sort(mLocalSubdivisionCandidates->begin(), mLocalSubdivisionCandidates->end());
1345	}
1346
1347
1348	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
1349	const AxisAlignedBox3 &box,
1350	const int pvsSize,
1351	const int axis,
1352	float &position)
1353	{
1354	RayInfoContainer usedRays;
1355
1356	if (mMaxTests < (int)rays.size())
1357	{
1358	GetRayInfoSets(rays, mMaxTests, usedRays);
1359	}
1360	else
1361	{
1362	usedRays = rays;
1363	}
1364
1365	const float minBox = box.Min(axis);
1366	const float maxBox = box.Max(axis);
1367
1368	const float sizeBox = maxBox - minBox;
1369
1370	const float minBand = minBox + mMinBand * sizeBox;
1371	const float maxBand = minBox + mMaxBand * sizeBox;
1372
1373	SortSubdivisionCandidates(usedRays, axis, minBand, maxBand);
1374
1375	//////////////////
1376	// go through the lists, count the number of objects left and right
1377	// and evaluate the following cost funcion:
1378	// C = ct_div_ci + (qlrl + qrrr)/queries
1379
1380	float pvsl = 0;
1381	float pvsr = (float)pvsSize;
1382
1383	float pvsBack = pvsl;
1384	float pvsFront = pvsr;
1385
1386	float sum = (float)pvsSize * sizeBox;
1387	float minSum = 1e20f;
1388
1389	// if no border can be found, take mid split
1390	position = minBox + 0.5f * sizeBox;
1391
1392	// the relative cost ratio
1393	float ratio = 99999999.0f;
1394	bool splitPlaneFound = false;
1395
1396	Intersectable::NewMail();
1397	RayInfoContainer::const_iterator ri, ri_end = usedRays.end();
1398
1399	// set all object as belonging to the front pvs
1400	for(ri = usedRays.begin(); ri != ri_end; ++ ri)
1401	{
1402	Intersectable oObject = (ri).mRay->mOriginObject;
1403	Intersectable tObject = (ri).mRay->mTerminationObject;
1404
1405	#if COUNT_ORIGIN_OBJECTS
1406
1407	if (oObject)
1408	{
1409	if (!oObject->Mailed())
1410	{
1411	oObject->Mail();
1412	oObject->mCounter = 1;
1413	}
1414	else
1415	{
1416	++ oObject->mCounter;
1417	}
1418	}
1419	#endif
1420
1421	if (tObject)
1422	{
1423	if (!tObject->Mailed())
1424	{
1425	tObject->Mail();
1426	tObject->mCounter = 1;
1427	}
1428	else
1429	{
1430	++ tObject->mCounter;
1431	}
1432	}
1433	}
1434
1435	Intersectable::NewMail();
1436	vector<SortableEntry>::const_iterator ci, ci_end = mLocalSubdivisionCandidates->end();
1437
1438	for (ci = mLocalSubdivisionCandidates->begin(); ci != ci_end; ++ ci)
1439	{
1440	VssRay *ray;
1441	ray = (*ci).ray;
1442
1443	Intersectable *oObject = ray->mOriginObject;
1444	Intersectable *tObject = ray->mTerminationObject;
1445
1446	switch ((*ci).type)
1447	{
1448	case SortableEntry::ERayMin:
1449	{
1450	#if COUNT_ORIGIN_OBJECTS
1451	if (oObject && !oObject->Mailed())
1452	{
1453	oObject->Mail();
1454	++ pvsl;
1455	}
1456	#endif
1457	if (tObject && !tObject->Mailed())
1458	{
1459	tObject->Mail();
1460	++ pvsl;
1461	}
1462
1463	break;
1464	}
1465	case SortableEntry::ERayMax:
1466	{
1467	#if COUNT_ORIGIN_OBJECTS
1468	if (oObject)
1469	{
1470	if (-- oObject->mCounter == 0)
1471	-- pvsr;
1472	}
1473	#endif
1474	if (tObject)
1475	{
1476	if (-- tObject->mCounter == 0)
1477	-- pvsr;
1478	}
1479
1480	break;
1481	}
1482	}
1483
1484
1485	// Note: we compare size of bounding boxes of front and back side because
1486	// of efficiency reasons (otherwise a new geometry would have to be computed
1487	// in each step and incremential evaluation would be difficult.
1488	// but then errors happen if the geometry is not an axis aligned box
1489	// (i.e., if a geometry aligned split was taken before)
1490	// question: is it sufficient to make this approximation?
1491	if (((ci).value >= minBand) && ((ci).value <= maxBand))
1492	{
1493	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
1494
1495	float currentPos;
1496
1497	// HACK: current positition is BETWEEN visibility events
1498	if (0 && ((ci + 1) != ci_end))
1499	{
1500	currentPos = ((ci).value + ((ci + 1)).value) * 0.5f;
1501	}
1502	else
1503	currentPos = (*ci).value;
1504
1505	//Debug << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
1506	//Debug << "cost= " << sum << endl;
1507
1508	if (sum < minSum)
1509	{
1510	splitPlaneFound = true;
1511
1512	minSum = sum;
1513	position = currentPos;
1514
1515	pvsBack = pvsl;
1516	pvsFront = pvsr;
1517	}
1518	}
1519	}
1520
1521	///////
1522	//-- compute cost
1523
1524	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
1525	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
1526
1527	const float pOverall = sizeBox;
1528
1529	const float pBack = position - minBox;
1530	const float pFront = maxBox - position;
1531
1532	const float penaltyOld = EvalPvsPenalty((float)pvsSize, lowerPvsLimit, upperPvsLimit);
1533	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1534	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1535
1536	const float oldRenderCost = penaltyOld * pOverall;
1537	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1538
1539	if (splitPlaneFound)
1540	{
1541	ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
1542	}
1543	//if (axis != 1)
1544	//Debug << "axis=" << axis << " costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
1545	// <<"\t pb=(" << pvsBack << ")\t pf=(" << pvsFront << ")" << endl;
1546
1547	return ratio;
1548	}
1549
1550
1551	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
1552	const VspBspTraversalData &tData,
1553	int &axis,
1554	BspNodeGeometry **frontGeom,
1555	BspNodeGeometry **backGeom,
1556	float &pFront,
1557	float &pBack,
1558	const bool isKdNode)
1559	{
1560	float nPosition[3];
1561	float nCostRatio[3];
1562	float nProbFront[3];
1563	float nProbBack[3];
1564
1565	BspNodeGeometry *nFrontGeom[3];
1566	BspNodeGeometry *nBackGeom[3];
1567
1568	// set to NULL, so I can find out which gemetry was stored
1569	for (int i = 0; i < 3; ++ i)
1570	{
1571	nFrontGeom[i] = NULL;
1572	nBackGeom[i] = NULL;
1573	}
1574
1575	// create bounding box of node geometry
1576	AxisAlignedBox3 box;
1577
1578	//TODO: for kd split geometry already is box => only take minmax vertices
1579	if (1)
1580	{ // get bounding box from geometry
1581	tData.mGeometry->GetBoundingBox(box);
1582	}
1583	else
1584	{
1585	box.Initialize();
1586	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1587
1588	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1589	box.Include((*ri).ExtrapTermination());
1590	}
1591
1592
1593	int sAxis = 0;
1594	int bestAxis;
1595
1596	// if max cost ratio is exceeded, take split along longest axis instead
1597	const float maxCostRatioForArbitraryAxis = 0.9f;
1598
1599	if (mUseDrivingAxisIfMaxCostViolated)
1600	bestAxis = box.Size().DrivingAxis();
1601	else
1602	bestAxis = -1;
1603
1604	#if 0
1605	// maximum cost ratio for axis to be valid:
1606	// if exceeded, spatial mid split is used instead
1607	const maxCostRatioForHeur = 0.99f;
1608	#endif
1609
1610	// if we use some kind of specialised fixed axis
1611	const bool useSpecialAxis =
1612	mOnlyDrivingAxis \|\| mUseRandomAxis \|\| mCirculatingAxis;
1613
1614	if (mUseRandomAxis)
1615	sAxis = Random(3);
1616	else if (mCirculatingAxis)
1617	sAxis = (tData.mAxis + 1) % 3;
1618	else if (mOnlyDrivingAxis)
1619	sAxis = box.Size().DrivingAxis();
1620
1621
1622	//Debug << "use special axis: " << useSpecialAxis << endl;
1623	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
1624
1625	for (axis = 0; axis < 3 ; ++ axis)
1626	{
1627	if (!useSpecialAxis \|\| (axis == sAxis))
1628	{
1629	if (mUseCostHeuristics)
1630	{
1631	//-- place split plane using heuristics
1632	nCostRatio[axis] =
1633	BestCostRatioHeuristics(*tData.mRays,
1634	box,
1635	tData.mPvs,
1636	axis,
1637	nPosition[axis]);
1638	}
1639	else
1640	{
1641	//-- split plane position is spatial median
1642	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1643	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1644
1645	// allows faster split because we have axis aligned kd tree boxes
1646	if (isKdNode)
1647	{
1648	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1649	box,
1650	axis,
1651	nPosition[axis],
1652	nProbFront[axis],
1653	nProbBack[axis]);
1654
1655	// create back geometry from box
1656
1657	// NOTE: the geometry is returned from the function so we
1658	// don't have to recompute it when possible
1659	Vector3 pos;
1660
1661	pos = box.Max(); pos[axis] = nPosition[axis];
1662	AxisAlignedBox3 bBox(box.Min(), pos);
1663
1664	PolygonContainer fPolys;
1665	bBox.ExtractPolys(fPolys);
1666
1667	nBackGeom[axis] = new BspNodeGeometry(fPolys);
1668
1669	////////////
1670	//-- create front geometry from box
1671
1672	pos = box.Min(); pos[axis] = nPosition[axis];
1673	AxisAlignedBox3 fBox(pos, box.Max());
1674
1675	PolygonContainer bPolys;
1676	fBox.ExtractPolys(bPolys);
1677	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
1678	}
1679	else
1680	{
1681	nFrontGeom[axis] = new BspNodeGeometry();
1682	nBackGeom[axis] = new BspNodeGeometry();
1683
1684	nCostRatio[axis] =
1685	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1686	tData, nFrontGeom[axis], nBackGeom[axis],
1687	nProbFront[axis], nProbBack[axis]);
1688	}
1689	}
1690
1691
1692	if (mUseDrivingAxisIfMaxCostViolated)
1693	{
1694	// we take longest axis split if cost ratio exceeds threshold
1695	if (nCostRatio[axis] < min(maxCostRatioForArbitraryAxis, nCostRatio[bestAxis]))
1696	{
1697	bestAxis = axis;
1698	}
1699	/*else if (nCostRatio[axis] < nCostRatio[bestAxis])
1700	{
1701	Debug << "taking split along longest axis (" << bestAxis << ") instead of (" << axis << ")" << endl;
1702	}*/
1703
1704	}
1705	else
1706	{
1707	if (bestAxis == -1)
1708	{
1709	bestAxis = axis;
1710	}
1711	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1712	{
1713	bestAxis = axis;
1714	}
1715	}
1716	}
1717	}
1718
1719	//////////
1720	//-- assign values
1721
1722	axis = bestAxis;
1723	pFront = nProbFront[bestAxis];
1724	pBack = nProbBack[bestAxis];
1725
1726	// assign best split nodes geometry
1727	*frontGeom = nFrontGeom[bestAxis];
1728	*backGeom = nBackGeom[bestAxis];
1729
1730	// and delete other geometry
1731	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1732	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1733
1734	//-- split plane
1735	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1736	plane = Plane3(normal, nPosition[bestAxis]);
1737
1738	//Debug << "best axis: " << bestAxis << " pos " << nPosition[bestAxis] << endl;
1739
1740	return nCostRatio[bestAxis];
1741	}
1742
1743
1744	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
1745	BspLeaf *leaf,
1746	VspBspTraversalData &data,
1747	VspBspTraversalData &frontData,
1748	VspBspTraversalData &backData,
1749	int &splitAxis)
1750	{
1751	// HACK matt: subdivide regularily to certain depth
1752	if (data.mDepth < 0) // question matt: why depth < 0 ?
1753	{
1754	cout << "depth: " << data.mDepth << endl;
1755
1756	// return axis aligned split
1757	AxisAlignedBox3 box;
1758	box.Initialize();
1759
1760	// create bounding box of region
1761	data.mGeometry->GetBoundingBox(box);
1762
1763	const int axis = box.Size().DrivingAxis();
1764	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1765
1766	Vector3 norm(0,0,0); norm[axis] = 1.0f;
1767	bestPlane = Plane3(norm, position);
1768	splitAxis = axis;
1769
1770	return true;
1771	}
1772
1773	// simplest strategy: just take next polygon
1774	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1775	{
1776	if (!data.mPolygons->empty())
1777	{
1778	const int randIdx =
1779	(int)RandomValue(0, (Real)((float)data.mPolygons->size() - 0.5f));
1780	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1781
1782	bestPlane = nextPoly->GetSupportingPlane();
1783	return true;
1784	}
1785	}
1786
1787	//-- use heuristics to find appropriate plane
1788
1789	// intermediate plane
1790	Plane3 plane;
1791	float lowestCost = MAX_FLOAT;
1792
1793	// decides if the first few splits should be only axisAligned
1794	const bool onlyAxisAligned =
1795	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1796	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1797	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1798
1799	const int limit = onlyAxisAligned ? 0 :
1800	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1801
1802	float candidateCost;
1803
1804	int maxIdx = (int)data.mPolygons->size();
1805
1806	for (int i = 0; i < limit; ++ i)
1807	{
1808	// the already taken candidates are stored behind maxIdx
1809	// => assure that no index is taken twice
1810	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1811	Polygon3 poly = (data.mPolygons)[candidateIdx];
1812
1813	// swap candidate to the end to avoid testing same plane
1814	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1815
1816	// evaluate current candidate
1817	BspNodeGeometry fGeom, bGeom;
1818	float fArea, bArea;
1819	plane = poly->GetSupportingPlane();
1820	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1821
1822	if (candidateCost < lowestCost)
1823	{
1824	bestPlane = plane;
1825	lowestCost = candidateCost;
1826	}
1827	}
1828
1829
1830	//-- evaluate axis aligned splits
1831
1832	int axis;
1833	BspNodeGeometry fGeom, bGeom;
1834	float pFront, pBack;
1835
1836	candidateCost = 99999999.0f;
1837
1838	// as a variant, we take axis aligned split only if there is
1839	// more polygon available to guide the split
1840	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
1841	{
1842	candidateCost = SelectAxisAlignedPlane(plane,
1843	data,
1844	axis,
1845	&fGeom,
1846	&bGeom,
1847	pFront,
1848	pBack,
1849	data.mIsKdNode);
1850	}
1851
1852	splitAxis = 3;
1853
1854	if (candidateCost < lowestCost)
1855	{
1856	bestPlane = plane;
1857	lowestCost = candidateCost;
1858	splitAxis = axis;
1859
1860	// assign already computed values
1861	// we can do this because we always save the
1862	// computed values from the axis aligned splits
1863
1864	if (fGeom && bGeom)
1865	{
1866	frontData.mGeometry = fGeom;
1867	backData.mGeometry = bGeom;
1868
1869	frontData.mProbability = pFront;
1870	backData.mProbability = pBack;
1871	}
1872	}
1873	else
1874	{
1875	DEL_PTR(fGeom);
1876	DEL_PTR(bGeom);
1877	}
1878
1879	#ifdef GTP_DEBUG
1880	Debug << "plane lowest cost: " << lowestCost << endl;
1881	#endif
1882
1883	// exeeded relative max cost ratio
1884	if (lowestCost > mTermMaxCostRatio)
1885	{
1886	return false;
1887	}
1888
1889	return true;
1890	}
1891
1892
1893	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1894	{
1895	const int candidateIdx = (int)RandomValue(0, (Real)((float)rays.size() - 0.5f));
1896
1897	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1898	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1899
1900	const Vector3 pt = (maxPt + minPt) * 0.5;
1901	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1902
1903	return Plane3(normal, pt);
1904	}
1905
1906
1907	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1908	{
1909	Vector3 pt[3];
1910
1911	int idx[3];
1912	int cmaxT = 0;
1913	int cminT = 0;
1914	bool chooseMin = false;
1915
1916	for (int j = 0; j < 3; ++ j)
1917	{
1918	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1919
1920	if (idx[j] >= (int)rays.size())
1921	{
1922	idx[j] -= (int)rays.size();
1923
1924	chooseMin = (cminT < 2);
1925	}
1926	else
1927	chooseMin = (cmaxT < 2);
1928
1929	RayInfo rayInf = rays[idx[j]];
1930	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1931	}
1932
1933	return Plane3(pt[0], pt[1], pt[2]);
1934	}
1935
1936
1937	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1938	{
1939	Vector3 pt[3];
1940
1941	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1942	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1943
1944	// check if rays different
1945	if (idx1 == idx2)
1946	idx2 = (idx2 + 1) % (int)rays.size();
1947
1948	const RayInfo ray1 = rays[idx1];
1949	const RayInfo ray2 = rays[idx2];
1950
1951	// normal vector of the plane parallel to both lines
1952	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1953
1954	// vector from line 1 to line 2
1955	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1956
1957	// project vector on normal to get distance
1958	const float dist = DotProd(vd, norm);
1959
1960	// point on plane lies halfway between the two planes
1961	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1962
1963	return Plane3(norm, planePt);
1964	}
1965
1966
1967	inline void VspBspTree::GenerateUniqueIdsForPvs()
1968	{
1969	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1970	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1971	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1972	}
1973
1974
1975	float VspBspTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
1976	const VspBspTraversalData &data,
1977	float &normalizedOldRenderCost) const
1978	{
1979	float pvsFront = 0;
1980	float pvsBack = 0;
1981	float totalPvs = 0;
1982
1983	// probability that view point lies in back / front node
1984	float pOverall = data.mProbability;
1985	float pFront = 0;
1986	float pBack = 0;
1987
1988
1989	// create unique ids for pvs heuristics
1990	GenerateUniqueIdsForPvs();
1991
1992	for (int i = 0; i < data.mRays->size(); ++ i)
1993	{
1994	RayInfo rayInf = (*data.mRays)[i];
1995
1996	float t;
1997	VssRay *ray = rayInf.mRay;
1998	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1999
2000	// find front and back pvs for origing and termination object
2001	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2002
2003	#if COUNT_ORIGIN_OBJECTS
2004	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2005	#endif
2006	}
2007
2008
2009	BspNodeGeometry geomFront;
2010	BspNodeGeometry geomBack;
2011
2012	// construct child geometry with regard to the candidate split plane
2013	data.mGeometry->SplitGeometry(geomFront,
2014	geomBack,
2015	candidatePlane,
2016	mBoundingBox,
2017	//0.0f);
2018	mEpsilon);
2019
2020	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
2021	{
2022	pFront = geomFront.GetVolume();
2023	pBack = pOverall - pFront;
2024
2025	// something is wrong with the volume
2026	if (0 && ((pFront < 0.0) \|\| (pBack < 0.0)))
2027	{
2028	Debug << "ERROR in volume:\n"
2029	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
2030	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
2031	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
2032	}
2033	}
2034	else
2035	{
2036	pFront = geomFront.GetArea();
2037	pBack = geomBack.GetArea();
2038	}
2039
2040
2041	// -- pvs rendering heuristics
2042
2043	// upper and lower bounds
2044	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
2045	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
2046
2047	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
2048	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
2049	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
2050
2051	const float oldRenderCost = pOverall * penaltyOld;
2052	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2053
2054	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBoundingBox.GetVolume();
2055
2056	// take render cost of node into account to avoid being stuck in a local minimum
2057	normalizedOldRenderCost = oldRenderCost / mBoundingBox.GetVolume();
2058
2059	return renderCostDecrease;
2060	}
2061
2062
2063	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
2064	const VspBspTraversalData &data,
2065	BspNodeGeometry &geomFront,
2066	BspNodeGeometry &geomBack,
2067	float &pFront,
2068	float &pBack) const
2069	{
2070	float totalPvs = 0;
2071	float pvsFront = 0;
2072	float pvsBack = 0;
2073
2074	// overall probability is used as normalizer
2075	float pOverall = 0;
2076
2077	// probability that view point lies in back / front node
2078	pFront = 0;
2079	pBack = 0;
2080
2081	int numTests; // the number of tests
2082
2083	// if random samples shold be taken instead of testing all the rays
2084	bool useRand;
2085
2086	if ((int)data.mRays->size() > mMaxTests)
2087	{
2088	useRand = true;
2089	numTests = mMaxTests;
2090	}
2091	else
2092	{
2093	useRand = false;
2094	numTests = (int)data.mRays->size();
2095	}
2096
2097	// create unique ids for pvs heuristics
2098	GenerateUniqueIdsForPvs();
2099
2100	for (int i = 0; i < numTests; ++ i)
2101	{
2102	const int testIdx = useRand ?
2103	(int)RandomValue(0, (Real)((float)data.mRays->size() - 0.5f)) : i;
2104	RayInfo rayInf = (*data.mRays)[testIdx];
2105
2106	float t;
2107	VssRay *ray = rayInf.mRay;
2108	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
2109
2110	// find front and back pvs for origing and termination object
2111	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2112
2113	#if COUNT_ORIGIN_OBJECTS
2114	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2115	#endif
2116	}
2117
2118	// construct child geometry with regard to the candidate split plane
2119	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
2120	geomBack,
2121	candidatePlane,
2122	mBoundingBox,
2123	//0.0f);
2124	mEpsilon);
2125
2126	pOverall = data.mProbability;
2127
2128	if (!mUseAreaForPvs)
2129	{
2130	pFront = geomFront.GetVolume();
2131	pBack = pOverall - pFront;
2132
2133	// HACK: precision issues possible for unbalanced split => don't take this split!
2134	if (1 &&
2135	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
2136	!geomFront.Valid() \|\| !geomBack.Valid()))
2137	{
2138	//Debug << "error f: " << pFront << " b: " << pBack << endl;
2139
2140	// high penalty for degenerated / wrong split
2141	return 99999.9f;
2142	}
2143	}
2144	else
2145	{
2146	// use front and back cell areas to approximate volume
2147	pFront = geomFront.GetArea();
2148	pBack = geomBack.GetArea();
2149	}
2150
2151	////////
2152	//-- pvs rendering heuristics
2153
2154	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
2155	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
2156
2157	// only render cost heuristics or combined with standard deviation
2158	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
2159	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
2160	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
2161
2162	const float oldRenderCost = pOverall * penaltyOld;
2163	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2164
2165	float oldCost, newCost;
2166
2167	// only render cost
2168	if (1)
2169	{
2170	oldCost = oldRenderCost;
2171	newCost = newRenderCost;
2172	}
2173	else // also considering standard deviation
2174	{
2175	// standard deviation is difference of back and front pvs
2176	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
2177
2178	const float newDeviation = 0.5f *
2179	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
2180
2181	const float oldDeviation = penaltyOld;
2182
2183	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
2184	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
2185	}
2186
2187	const float cost = mPvsFactor * newCost / (oldCost + Limits::Small);
2188
2189
2190	#ifdef GTP_DEBUG
2191	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
2192	<< " frontpvs: " << pvsFront << " pFront: " << pFront
2193	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
2194	Debug << "cost: " << cost << endl;
2195	#endif
2196
2197	return cost;
2198	}
2199
2200
2201	int VspBspTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
2202	ViewCellContainer &viewCells) const
2203	{
2204	stack<bspNodePair> nodeStack;
2205	BspNodeGeometry *rgeom = new BspNodeGeometry();
2206
2207	ConstructGeometry(mRoot, *rgeom);
2208
2209	nodeStack.push(bspNodePair(mRoot, rgeom));
2210
2211	ViewCell::NewMail();
2212
2213	while (!nodeStack.empty())
2214	{
2215	BspNode *node = nodeStack.top().first;
2216	BspNodeGeometry *geom = nodeStack.top().second;
2217	nodeStack.pop();
2218
2219	const int side = geom->ComputeIntersection(box);
2220
2221	switch (side)
2222	{
2223	case -1:
2224	// node geometry is contained in box
2225	CollectViewCells(node, true, viewCells, true);
2226	break;
2227
2228	case 0:
2229	if (node->IsLeaf())
2230	{
2231	BspLeaf leaf = static_cast<BspLeaf >(node);
2232
2233	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2234	{
2235	leaf->GetViewCell()->Mail();
2236	viewCells.push_back(leaf->GetViewCell());
2237	}
2238	}
2239	else
2240	{
2241	BspInterior interior = static_cast<BspInterior >(node);
2242
2243	BspNode *first = interior->GetFront();
2244	BspNode *second = interior->GetBack();
2245
2246	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2247	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2248
2249	geom->SplitGeometry(*firstGeom,
2250	*secondGeom,
2251	interior->GetPlane(),
2252	mBoundingBox,
2253	//0.0000001f);
2254	mEpsilon);
2255
2256	nodeStack.push(bspNodePair(first, firstGeom));
2257	nodeStack.push(bspNodePair(second, secondGeom));
2258	}
2259
2260	break;
2261	default:
2262	// default: cull
2263	break;
2264	}
2265
2266	DEL_PTR(geom);
2267
2268	}
2269
2270	return (int)viewCells.size();
2271	}
2272
2273
2274	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
2275	const AxisAlignedBox3 &box,
2276	const int axis,
2277	const float &position,
2278	float &pFront,
2279	float &pBack) const
2280	{
2281	float pvsTotal = 0;
2282	float pvsFront = 0;
2283	float pvsBack = 0;
2284
2285	// create unique ids for pvs heuristics
2286	GenerateUniqueIdsForPvs();
2287
2288	const int pvsSize = data.mPvs;
2289
2290	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
2291
2292	// this is the main ray classification loop!
2293	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
2294	{
2295	// determine the side of this ray with respect to the plane
2296	float t;
2297	const int side = (*rit).ComputeRayIntersection(axis, position, t);
2298
2299	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
2300
2301	#if COUNT_ORIGIN_OBJECTS
2302	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
2303	#endif
2304	}
2305
2306
2307	//-- pvs heuristics
2308
2309	float pOverall = data.mProbability;
2310
2311	// note: we use a simplified computation assuming that we always do a
2312	// spatial mid split
2313
2314	if (!mUseAreaForPvs)
2315	{
2316	// volume
2317	pBack = pFront = pOverall * 0.5f;
2318	#if 0
2319	// box length substitute for probability
2320	const float minBox = box.Min(axis);
2321	const float maxBox = box.Max(axis);
2322
2323	pBack = position - minBox;
2324	pFront = maxBox - position;
2325	pOverall = maxBox - minBox;
2326	#endif
2327	}
2328	else //-- area substitute for probability
2329	{
2330	const int axis2 = (axis + 1) % 3;
2331	const int axis3 = (axis + 2) % 3;
2332
2333	const float faceArea =
2334	(box.Max(axis2) - box.Min(axis2)) *
2335	(box.Max(axis3) - box.Min(axis3));
2336
2337	pBack = pFront = pOverall * 0.5f + faceArea;
2338	}
2339
2340	#ifdef GTP_DEBUG
2341	Debug << "axis: " << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
2342	Debug << "p: " << pFront << " " << pBack << " " << pOverall << endl;
2343	#endif
2344
2345
2346	const float newCost = pvsBack * pBack + pvsFront * pFront;
2347	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
2348
2349	return (mCtDivCi + newCost) / oldCost;
2350	}
2351
2352
2353	inline void VspBspTree::AddObjToPvs(Intersectable *obj,
2354	const int cf,
2355	float &frontPvs,
2356	float &backPvs,
2357	float &totalPvs) const
2358	{
2359	if (!obj)
2360	return;
2361	#if 0
2362	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
2363	#else
2364	const int renderCost = 1;
2365	#endif
2366	// new object
2367	if ((obj->mMailbox != sFrontId) &&
2368	(obj->mMailbox != sBackId) &&
2369	(obj->mMailbox != sFrontAndBackId))
2370	{
2371	totalPvs += renderCost;
2372	}
2373
2374	// TODO: does this really belong to no pvs?
2375	//if (cf == Ray::COINCIDENT) return;
2376
2377	// object belongs to both PVS
2378	if (cf >= 0)
2379	{
2380	if ((obj->mMailbox != sFrontId) &&
2381	(obj->mMailbox != sFrontAndBackId))
2382	{
2383	frontPvs += renderCost;
2384
2385	if (obj->mMailbox == sBackId)
2386	obj->mMailbox = sFrontAndBackId;
2387	else
2388	obj->mMailbox = sFrontId;
2389	}
2390	}
2391
2392	if (cf <= 0)
2393	{
2394	if ((obj->mMailbox != sBackId) &&
2395	(obj->mMailbox != sFrontAndBackId))
2396	{
2397	backPvs += renderCost;
2398
2399	if (obj->mMailbox == sFrontId)
2400	obj->mMailbox = sFrontAndBackId;
2401	else
2402	obj->mMailbox = sBackId;
2403	}
2404	}
2405	}
2406
2407
2408	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
2409	const bool onlyUnmailed,
2410	const int maxPvsSize) const
2411	{
2412	stack<BspNode *> nodeStack;
2413	nodeStack.push(mRoot);
2414
2415	while (!nodeStack.empty())
2416	{
2417	BspNode *node = nodeStack.top();
2418	nodeStack.pop();
2419
2420	if (node->IsLeaf())
2421	{
2422	// test if this leaf is in valid view space
2423	BspLeaf leaf = static_cast<BspLeaf >(node);
2424	if (leaf->TreeValid() &&
2425	(!onlyUnmailed \|\| !leaf->Mailed()) &&
2426	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().EvalPvsCost() <= maxPvsSize)))
2427	{
2428	leaves.push_back(leaf);
2429	}
2430	}
2431	else
2432	{
2433	BspInterior interior = static_cast<BspInterior >(node);
2434
2435	nodeStack.push(interior->GetBack());
2436	nodeStack.push(interior->GetFront());
2437	}
2438	}
2439	}
2440
2441
2442	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
2443	{
2444	return mBoundingBox;
2445	}
2446
2447
2448	BspNode *VspBspTree::GetRoot() const
2449	{
2450	return mRoot;
2451	}
2452
2453
2454	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
2455	{
2456	// the node became a leaf -> evaluate stats for leafs
2457	BspLeaf leaf = static_cast<BspLeaf >(data.mNode);
2458
2459
2460	if (data.mPvs > mBspStats.maxPvs)
2461	{
2462	mBspStats.maxPvs = data.mPvs;
2463	}
2464
2465	mBspStats.pvs += data.mPvs;
2466
2467	if (data.mDepth < mBspStats.minDepth)
2468	{
2469	mBspStats.minDepth = data.mDepth;
2470	}
2471
2472	if (data.mDepth >= mTermMaxDepth)
2473	{
2474	++ mBspStats.maxDepthNodes;
2475	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
2476	}
2477
2478	// accumulate rays to compute rays / leaf
2479	mBspStats.accumRays += (int)data.mRays->size();
2480
2481	if (data.mPvs < mTermMinPvs)
2482	++ mBspStats.minPvsNodes;
2483
2484	if ((int)data.mRays->size() < mTermMinRays)
2485	++ mBspStats.minRaysNodes;
2486
2487	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
2488	++ mBspStats.maxRayContribNodes;
2489
2490	if (data.mProbability <= mTermMinProbability)
2491	++ mBspStats.minProbabilityNodes;
2492
2493	// accumulate depth to compute average depth
2494	mBspStats.accumDepth += data.mDepth;
2495
2496	++ mCreatedViewCells;
2497
2498	#ifdef GTP_DEBUG
2499	Debug << "BSP stats: "
2500	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
2501	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
2502	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
2503	<< "#pvs: " << leaf->GetViewCell()->GetPvs().EvalPvsCost() << "), "
2504	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
2505	#endif
2506	}
2507
2508
2509	int VspBspTree::CastRay(Ray &ray)
2510	{
2511	int hits = 0;
2512
2513	stack<BspRayTraversalData> tQueue;
2514
2515	float maxt, mint;
2516
2517	if (!mBoundingBox.GetRaySegment(ray, mint, maxt))
2518	return 0;
2519
2520	Intersectable::NewMail();
2521	ViewCell::NewMail();
2522
2523	Vector3 entp = ray.Extrap(mint);
2524	Vector3 extp = ray.Extrap(maxt);
2525
2526	BspNode *node = mRoot;
2527	BspNode *farChild = NULL;
2528
2529	while (1)
2530	{
2531	if (!node->IsLeaf())
2532	{
2533	BspInterior in = static_cast<BspInterior >(node);
2534
2535	Plane3 splitPlane = in->GetPlane();
2536	const int entSide = splitPlane.Side(entp);
2537	const int extSide = splitPlane.Side(extp);
2538
2539	if (entSide < 0)
2540	{
2541	node = in->GetBack();
2542
2543	if(extSide <= 0) // plane does not split ray => no far child
2544	continue;
2545
2546	farChild = in->GetFront(); // plane splits ray
2547
2548	} else if (entSide > 0)
2549	{
2550	node = in->GetFront();
2551
2552	if (extSide >= 0) // plane does not split ray => no far child
2553	continue;
2554
2555	farChild = in->GetBack(); // plane splits ray
2556	}
2557	else // ray and plane are coincident
2558	{
2559	// matt: WHAT TO DO IN THIS CASE ?
2560	//break;
2561	node = in->GetFront();
2562	continue;
2563	}
2564
2565	// push data for far child
2566	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
2567
2568	// find intersection of ray segment with plane
2569	float t;
2570	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
2571	maxt *= t;
2572	}
2573	else // reached leaf => intersection with view cell
2574	{
2575	BspLeaf leaf = static_cast<BspLeaf >(node);
2576
2577	if (!leaf->GetViewCell()->Mailed())
2578	{
2579	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
2580	leaf->GetViewCell()->Mail();
2581	++ hits;
2582	}
2583
2584	//-- fetch the next far child from the stack
2585	if (tQueue.empty())
2586	break;
2587
2588	entp = extp;
2589	mint = maxt; // NOTE: need this?
2590
2591	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
2592	break;
2593
2594	BspRayTraversalData &s = tQueue.top();
2595
2596	node = s.mNode;
2597	extp = s.mExitPoint;
2598	maxt = s.mMaxT;
2599
2600	tQueue.pop();
2601	}
2602	}
2603
2604	return hits;
2605	}
2606
2607
2608	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells,
2609	bool onlyValid) const
2610	{
2611	ViewCell::NewMail();
2612	CollectViewCells(mRoot, onlyValid, viewCells, true);
2613	}
2614
2615
2616	void VspBspTree::CollectViewCells(BspNode *root,
2617	bool onlyValid,
2618	ViewCellContainer &viewCells,
2619	bool onlyUnmailed) const
2620	{
2621	stack<BspNode *> nodeStack;
2622
2623	if (!root)
2624	return;
2625
2626	nodeStack.push(root);
2627
2628	while (!nodeStack.empty())
2629	{
2630	BspNode *node = nodeStack.top();
2631	nodeStack.pop();
2632
2633	if (node->IsLeaf())
2634	{
2635	if (!onlyValid \|\| node->TreeValid())
2636	{
2637	ViewCellLeaf leafVc = static_cast<BspLeaf >(node)->GetViewCell();
2638
2639	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
2640
2641	if (!onlyUnmailed \|\| !viewCell->Mailed())
2642	{
2643	viewCell->Mail();
2644	viewCells.push_back(viewCell);
2645	}
2646	}
2647	}
2648	else
2649	{
2650	BspInterior interior = static_cast<BspInterior >(node);
2651
2652	nodeStack.push(interior->GetFront());
2653	nodeStack.push(interior->GetBack());
2654	}
2655	}
2656	}
2657
2658
2659	void VspBspTree::CollapseViewCells()
2660	{
2661	// TODO
2662	#if HAS_TO_BE_REDONE
2663	stack<BspNode *> nodeStack;
2664
2665	if (!mRoot)
2666	return;
2667
2668	nodeStack.push(mRoot);
2669
2670	while (!nodeStack.empty())
2671	{
2672	BspNode *node = nodeStack.top();
2673	nodeStack.pop();
2674
2675	if (node->IsLeaf())
2676	{
2677	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
2678
2679	if (!viewCell->GetValid())
2680	{
2681	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
2682
2683	ViewCellContainer leaves;
2684	mViewCellsTree->CollectLeaves(viewCell, leaves);
2685
2686	ViewCellContainer::const_iterator it, it_end = leaves.end();
2687
2688	for (it = leaves.begin(); it != it_end; ++ it)
2689	{
2690	BspLeaf l = static_cast<BspViewCell >(*it)->mLeaf;
2691	l->SetViewCell(GetOrCreateOutOfBoundsCell());
2692	++ mBspStats.invalidLeaves;
2693	}
2694
2695	// add to unbounded view cell
2696	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
2697	DEL_PTR(viewCell);
2698	}
2699	}
2700	else
2701	{
2702	BspInterior interior = static_cast<BspInterior >(node);
2703
2704	nodeStack.push(interior->GetFront());
2705	nodeStack.push(interior->GetBack());
2706	}
2707	}
2708
2709	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2710	#endif
2711	}
2712
2713
2714	void VspBspTree::CollectRays(VssRayContainer &rays)
2715	{
2716	vector<BspLeaf *> leaves;
2717
2718	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
2719
2720	for (lit = leaves.begin(); lit != lit_end; ++ lit)
2721	{
2722	BspLeaf leaf = lit;
2723	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
2724
2725	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
2726	rays.push_back(*rit);
2727	}
2728	}
2729
2730
2731	void VspBspTree::ValidateTree()
2732	{
2733	stack<BspNode *> nodeStack;
2734
2735	if (!mRoot)
2736	return;
2737
2738	nodeStack.push(mRoot);
2739
2740	mBspStats.invalidLeaves = 0;
2741	while (!nodeStack.empty())
2742	{
2743	BspNode *node = nodeStack.top();
2744	nodeStack.pop();
2745
2746	if (node->IsLeaf())
2747	{
2748	BspLeaf leaf = static_cast<BspLeaf >(node);
2749
2750	if (!leaf->GetViewCell()->GetValid())
2751	++ mBspStats.invalidLeaves;
2752
2753	// validity flags don't match => repair
2754	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
2755	{
2756	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
2757	PropagateUpValidity(leaf);
2758	}
2759	}
2760	else
2761	{
2762	BspInterior interior = static_cast<BspInterior >(node);
2763
2764	nodeStack.push(interior->GetFront());
2765	nodeStack.push(interior->GetBack());
2766	}
2767	}
2768
2769	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2770	}
2771
2772
2773	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
2774	{
2775	// preprocess: throw out polygons coincident to the view space box (not needed)
2776	PolygonContainer boxPolys;
2777
2778	mBoundingBox.ExtractPolys(boxPolys);
2779	vector<Plane3> boxPlanes;
2780
2781	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2782
2783	// extract planes of box
2784	// TODO: can be done more elegantly than first extracting polygons
2785	// and take their planes
2786	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2787	{
2788	boxPlanes.push_back((*pit)->GetSupportingPlane());
2789	}
2790
2791	pit_end = polys.end();
2792
2793	for (pit = polys.begin(); pit != pit_end; ++ pit)
2794	{
2795	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2796
2797	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2798	{
2799	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2800
2801	if (cf == Polygon3::COINCIDENT)
2802	{
2803	DEL_PTR(*pit);
2804	//Debug << "coincident!!" << endl;
2805	}
2806	}
2807	}
2808
2809	// remove deleted entries after swapping them to end of vector
2810	for (int i = 0; i < (int)polys.size(); ++ i)
2811	{
2812	while (!polys[i] && (i < (int)polys.size()))
2813	{
2814	swap(polys[i], polys.back());
2815	polys.pop_back();
2816	}
2817	}
2818	}
2819
2820
2821	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2822	{
2823	float len = 0;
2824
2825	RayInfoContainer::const_iterator it, it_end = rays.end();
2826
2827	for (it = rays.begin(); it != it_end; ++ it)
2828	len += (*it).SegmentLength();
2829
2830	return len;
2831	}
2832
2833
2834	int VspBspTree::SplitRays(const Plane3 &plane,
2835	RayInfoContainer &rays,
2836	RayInfoContainer &frontRays,
2837	RayInfoContainer &backRays) const
2838	{
2839	int splits = 0;
2840
2841	RayInfoContainer::const_iterator it, it_end = rays.end();
2842
2843	for (it = rays.begin(); it != it_end; ++ it)
2844	{
2845	RayInfo bRay = *it;
2846
2847	VssRay *ray = bRay.mRay;
2848	float t;
2849
2850	// get classification and receive new t
2851	const int cf = bRay.ComputeRayIntersection(plane, t);
2852
2853	switch (cf)
2854	{
2855	case -1:
2856	backRays.push_back(bRay);
2857	break;
2858	case 1:
2859	frontRays.push_back(bRay);
2860	break;
2861	case 0:
2862	{
2863	//-- split ray
2864	// test if start point behind or in front of plane
2865	const int side = plane.Side(bRay.ExtrapOrigin());
2866
2867	++ splits;
2868
2869	if (side <= 0)
2870	{
2871	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2872	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2873	}
2874	else
2875	{
2876	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2877	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2878	}
2879	}
2880	break;
2881	default:
2882	Debug << "Should not come here" << endl;
2883	break;
2884	}
2885	}
2886
2887	return splits;
2888	}
2889
2890
2891	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2892	{
2893	BspNode *lastNode;
2894
2895	do
2896	{
2897	lastNode = n;
2898
2899	// want to get planes defining geometry of this node => don't take
2900	// split plane of node itself
2901	n = n->GetParent();
2902
2903	if (n)
2904	{
2905	BspInterior interior = static_cast<BspInterior >(n);
2906	Plane3 halfSpace = static_cast<BspInterior *>(interior)->GetPlane();
2907
2908	if (interior->GetBack() != lastNode)
2909	halfSpace.ReverseOrientation();
2910
2911	halfSpaces.push_back(halfSpace);
2912	}
2913	}
2914	while (n);
2915	}
2916
2917
2918	void VspBspTree::ConstructGeometry(BspNode *n,
2919	BspNodeGeometry &geom) const
2920	{
2921	vector<Plane3> halfSpaces;
2922	ExtractHalfSpaces(n, halfSpaces);
2923
2924	PolygonContainer candidatePolys;
2925	vector<Plane3> candidatePlanes;
2926
2927	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
2928
2929	// bounded planes are added to the polygons
2930	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
2931	{
2932	Polygon3 p = GetBoundingBox().CrossSection(pit);
2933
2934	if (p->Valid(mEpsilon))
2935	{
2936	candidatePolys.push_back(p);
2937	candidatePlanes.push_back(*pit);
2938	}
2939	}
2940
2941	// add faces of bounding box (also could be faces of the cell)
2942	for (int i = 0; i < 6; ++ i)
2943	{
2944	VertexContainer vertices;
2945
2946	for (int j = 0; j < 4; ++ j)
2947	{
2948	vertices.push_back(mBoundingBox.GetFace(i).mVertices[j]);
2949	}
2950
2951	Polygon3 *poly = new Polygon3(vertices);
2952
2953	candidatePolys.push_back(poly);
2954	candidatePlanes.push_back(poly->GetSupportingPlane());
2955	}
2956
2957	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2958	{
2959	// polygon is split by all other planes
2960	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2961	{
2962	if (i == j) // polygon and plane are coincident
2963	continue;
2964
2965	VertexContainer splitPts;
2966	Polygon3 frontPoly, backPoly;
2967
2968	const int cf =
2969	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2970	mEpsilon);
2971
2972	switch (cf)
2973	{
2974	case Polygon3::SPLIT:
2975	frontPoly = new Polygon3();
2976	backPoly = new Polygon3();
2977
2978	candidatePolys[i]->Split(halfSpaces[j],
2979	*frontPoly,
2980	*backPoly,
2981	mEpsilon);
2982
2983	DEL_PTR(candidatePolys[i]);
2984
2985	if (backPoly->Valid(mEpsilon))
2986	{
2987	candidatePolys[i] = backPoly;
2988	}
2989	else
2990	{
2991	DEL_PTR(backPoly);
2992	}
2993
2994	// outside, don't need this
2995	DEL_PTR(frontPoly);
2996	break;
2997
2998	// polygon outside of halfspace
2999	case Polygon3::FRONT_SIDE:
3000	DEL_PTR(candidatePolys[i]);
3001	break;
3002
3003	// just take polygon as it is
3004	case Polygon3::BACK_SIDE:
3005	case Polygon3::COINCIDENT:
3006	default:
3007	break;
3008	}
3009	}
3010
3011	if (candidatePolys[i])
3012	{
3013	geom.Add(candidatePolys[i], candidatePlanes[i]);
3014	}
3015	}
3016	}
3017
3018
3019	bool VspBspTree::IsOutOfBounds(ViewCell *vc) const
3020	{
3021	return vc->GetId() == OUT_OF_BOUNDS_ID;
3022	}
3023
3024
3025	void VspBspTree::SetViewCellsTree(ViewCellsTree *viewCellsTree)
3026	{
3027	mViewCellsTree = viewCellsTree;
3028	}
3029
3030
3031	void VspBspTree::ConstructGeometry(ViewCell *vc,
3032	BspNodeGeometry &vcGeom) const
3033	{
3034	// if false, cannot construct geometry for interior leaf
3035	if (!mViewCellsTree)
3036	return;
3037
3038	ViewCellContainer leaves;
3039	mViewCellsTree->CollectLeaves(vc, leaves);
3040
3041	ViewCellContainer::const_iterator it, it_end = leaves.end();
3042
3043	for (it = leaves.begin(); it != it_end; ++ it)
3044	{
3045	if (IsOutOfBounds(*it))
3046	continue;
3047
3048	BspViewCell bspVc = static_cast<BspViewCell >(*it);
3049	vector<BspLeaf *>::const_iterator bit, bit_end = bspVc->mLeaves.end();
3050
3051	for (bit = bspVc->mLeaves.begin(); bit != bit_end; ++ bit)
3052	{
3053	BspLeaf l = bit;
3054	ConstructGeometry(l, vcGeom);
3055	}
3056	}
3057	}
3058
3059
3060	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
3061	const bool onlyUnmailed) const
3062	{
3063	stack<bspNodePair> nodeStack;
3064
3065	BspNodeGeometry nodeGeom;
3066	ConstructGeometry(n, nodeGeom);
3067	// const float eps = 0.5f;
3068	const float eps = 0.01f;
3069	// split planes from the root to this node
3070	// needed to verify that we found neighbor leaf
3071	// TODO: really needed?
3072	vector<Plane3> halfSpaces;
3073	ExtractHalfSpaces(n, halfSpaces);
3074
3075
3076	BspNodeGeometry *rgeom = new BspNodeGeometry();
3077	ConstructGeometry(mRoot, *rgeom);
3078
3079	nodeStack.push(bspNodePair(mRoot, rgeom));
3080
3081	while (!nodeStack.empty())
3082	{
3083	BspNode *node = nodeStack.top().first;
3084	BspNodeGeometry *geom = nodeStack.top().second;
3085
3086	nodeStack.pop();
3087
3088	if (node->IsLeaf())
3089	{
3090	// test if this leaf is in valid view space
3091	if (node->TreeValid() &&
3092	(node != n) &&
3093	(!onlyUnmailed \|\| !node->Mailed()))
3094	{
3095	bool isAdjacent = true;
3096
3097	if (1)
3098	{
3099	// test all planes of current node if still adjacent
3100	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
3101	{
3102	const int cf =
3103	Polygon3::ClassifyPlane(geom->GetPolys(),
3104	halfSpaces[i],
3105	eps);
3106
3107	if (cf == Polygon3::FRONT_SIDE)
3108	{
3109	isAdjacent = false;
3110	}
3111	}
3112	}
3113	else
3114	{
3115	// TODO: why is this wrong??
3116	// test all planes of current node if still adjacent
3117	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
3118	{
3119	Polygon3 *poly = nodeGeom.GetPolys()[i];
3120
3121	const int cf =
3122	Polygon3::ClassifyPlane(geom->GetPolys(),
3123	poly->GetSupportingPlane(),
3124	eps);
3125
3126	if (cf == Polygon3::FRONT_SIDE)
3127	{
3128	isAdjacent = false;
3129	}
3130	}
3131	}
3132	// neighbor was found
3133	if (isAdjacent)
3134	{
3135	neighbors.push_back(static_cast<BspLeaf *>(node));
3136	}
3137	}
3138	}
3139	else
3140	{
3141	BspInterior interior = static_cast<BspInterior >(node);
3142
3143	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3144	interior->GetPlane(),
3145	eps);
3146
3147	BspNode *front = interior->GetFront();
3148	BspNode *back = interior->GetBack();
3149
3150	BspNodeGeometry *fGeom = new BspNodeGeometry();
3151	BspNodeGeometry *bGeom = new BspNodeGeometry();
3152
3153	geom->SplitGeometry(*fGeom,
3154	*bGeom,
3155	interior->GetPlane(),
3156	mBoundingBox,
3157	//0.0000001f);
3158	eps);
3159
3160	if (cf == Polygon3::BACK_SIDE)
3161	{
3162	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3163	DEL_PTR(fGeom);
3164	}
3165	else
3166	{
3167	if (cf == Polygon3::FRONT_SIDE)
3168	{
3169	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3170	DEL_PTR(bGeom);
3171	}
3172	else
3173	{ // random decision
3174	nodeStack.push(bspNodePair(front, fGeom));
3175	nodeStack.push(bspNodePair(back, bGeom));
3176	}
3177	}
3178	}
3179
3180	DEL_PTR(geom);
3181	}
3182
3183	return (int)neighbors.size();
3184	}
3185
3186
3187
3188	int VspBspTree::FindApproximateNeighbors(BspNode *n,
3189	vector<BspLeaf *> &neighbors,
3190	const bool onlyUnmailed) const
3191	{
3192	stack<bspNodePair> nodeStack;
3193
3194	BspNodeGeometry nodeGeom;
3195	ConstructGeometry(n, nodeGeom);
3196
3197	float eps = 0.01f;
3198	// split planes from the root to this node
3199	// needed to verify that we found neighbor leaf
3200	// TODO: really needed?
3201	vector<Plane3> halfSpaces;
3202	ExtractHalfSpaces(n, halfSpaces);
3203
3204
3205	BspNodeGeometry *rgeom = new BspNodeGeometry();
3206	ConstructGeometry(mRoot, *rgeom);
3207
3208	nodeStack.push(bspNodePair(mRoot, rgeom));
3209
3210	while (!nodeStack.empty())
3211	{
3212	BspNode *node = nodeStack.top().first;
3213	BspNodeGeometry *geom = nodeStack.top().second;
3214
3215	nodeStack.pop();
3216
3217	if (node->IsLeaf())
3218	{
3219	// test if this leaf is in valid view space
3220	if (node->TreeValid() &&
3221	(node != n) &&
3222	(!onlyUnmailed \|\| !node->Mailed()))
3223	{
3224	bool isAdjacent = true;
3225
3226	// neighbor was found
3227	if (isAdjacent)
3228	{
3229	neighbors.push_back(static_cast<BspLeaf *>(node));
3230	}
3231	}
3232	}
3233	else
3234	{
3235	BspInterior interior = static_cast<BspInterior >(node);
3236
3237	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3238	interior->GetPlane(),
3239	eps);
3240
3241	BspNode *front = interior->GetFront();
3242	BspNode *back = interior->GetBack();
3243
3244	BspNodeGeometry *fGeom = new BspNodeGeometry();
3245	BspNodeGeometry *bGeom = new BspNodeGeometry();
3246
3247	geom->SplitGeometry(*fGeom,
3248	*bGeom,
3249	interior->GetPlane(),
3250	mBoundingBox,
3251	//0.0000001f);
3252	eps);
3253
3254	if (cf == Polygon3::BACK_SIDE)
3255	{
3256	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3257	DEL_PTR(fGeom);
3258	}
3259	else
3260	{
3261	if (cf == Polygon3::FRONT_SIDE)
3262	{
3263	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3264	DEL_PTR(bGeom);
3265	}
3266	else
3267	{ // random decision
3268	nodeStack.push(bspNodePair(front, fGeom));
3269	nodeStack.push(bspNodePair(back, bGeom));
3270	}
3271	}
3272	}
3273
3274	DEL_PTR(geom);
3275	}
3276
3277	return (int)neighbors.size();
3278	}
3279
3280
3281
3282	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
3283	{
3284	stack<BspNode *> nodeStack;
3285	nodeStack.push(mRoot);
3286
3287	int mask = rand();
3288
3289	while (!nodeStack.empty())
3290	{
3291	BspNode *node = nodeStack.top();
3292	nodeStack.pop();
3293
3294	if (node->IsLeaf())
3295	{
3296	return static_cast<BspLeaf *>(node);
3297	}
3298	else
3299	{
3300	BspInterior interior = static_cast<BspInterior >(node);
3301	BspNode *next;
3302	BspNodeGeometry geom;
3303
3304	// todo: not very efficient: constructs full cell everytime
3305	ConstructGeometry(interior, geom);
3306
3307	const int cf =
3308	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
3309
3310	if (cf == Polygon3::BACK_SIDE)
3311	next = interior->GetFront();
3312	else
3313	if (cf == Polygon3::FRONT_SIDE)
3314	next = interior->GetFront();
3315	else
3316	{
3317	// random decision
3318	if (mask & 1)
3319	next = interior->GetBack();
3320	else
3321	next = interior->GetFront();
3322	mask = mask >> 1;
3323	}
3324
3325	nodeStack.push(next);
3326	}
3327	}
3328
3329	return NULL;
3330	}
3331
3332
3333	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
3334	{
3335	stack<BspNode *> nodeStack;
3336
3337	nodeStack.push(mRoot);
3338
3339	int mask = rand();
3340
3341	while (!nodeStack.empty())
3342	{
3343	BspNode *node = nodeStack.top();
3344	nodeStack.pop();
3345
3346	if (node->IsLeaf())
3347	{
3348	if ( (!onlyUnmailed \|\| !node->Mailed()) )
3349	return static_cast<BspLeaf *>(node);
3350	}
3351	else
3352	{
3353	BspInterior interior = static_cast<BspInterior >(node);
3354
3355	// random decision
3356	if (mask & 1)
3357	nodeStack.push(interior->GetBack());
3358	else
3359	nodeStack.push(interior->GetFront());
3360
3361	mask = mask >> 1;
3362	}
3363	}
3364
3365	return NULL;
3366	}
3367
3368
3369	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
3370	{
3371	int pvsSize = 0;
3372
3373	RayInfoContainer::const_iterator rit, rit_end = rays.end();
3374
3375	Intersectable::NewMail();
3376
3377	for (rit = rays.begin(); rit != rays.end(); ++ rit)
3378	{
3379	VssRay ray = (rit).mRay;
3380
3381	#if COUNT_ORIGIN_OBJECTS
3382	if (ray->mOriginObject)
3383	{
3384	if (!ray->mOriginObject->Mailed())
3385	{
3386	ray->mOriginObject->Mail();
3387	++ pvsSize;
3388	}
3389	}
3390	#endif
3391	if (ray->mTerminationObject)
3392	{
3393	if (!ray->mTerminationObject->Mailed())
3394	{
3395	ray->mTerminationObject->Mail();
3396	++ pvsSize;
3397	}
3398	}
3399	}
3400
3401	return pvsSize;
3402	}
3403
3404
3405	float VspBspTree::GetEpsilon() const
3406	{
3407	return mEpsilon;
3408	}
3409
3410
3411	int VspBspTree::SplitPolygons(const Plane3 &plane,
3412	PolygonContainer &polys,
3413	PolygonContainer &frontPolys,
3414	PolygonContainer &backPolys,
3415	PolygonContainer &coincident) const
3416	{
3417	int splits = 0;
3418
3419	PolygonContainer::const_iterator it, it_end = polys.end();
3420
3421	for (it = polys.begin(); it != polys.end(); ++ it)
3422	{
3423	Polygon3 poly = it;
3424
3425	// classify polygon
3426	const int cf = poly->ClassifyPlane(plane, mEpsilon);
3427
3428	switch (cf)
3429	{
3430	case Polygon3::COINCIDENT:
3431	coincident.push_back(poly);
3432	break;
3433	case Polygon3::FRONT_SIDE:
3434	frontPolys.push_back(poly);
3435	break;
3436	case Polygon3::BACK_SIDE:
3437	backPolys.push_back(poly);
3438	break;
3439	case Polygon3::SPLIT:
3440	backPolys.push_back(poly);
3441	frontPolys.push_back(poly);
3442	++ splits;
3443	break;
3444	default:
3445	Debug << "SHOULD NEVER COME HERE\n";
3446	break;
3447	}
3448	}
3449
3450	return splits;
3451	}
3452
3453
3454	int VspBspTree::CastLineSegment(const Vector3 &origin,
3455	const Vector3 &termination,
3456	ViewCellContainer &viewcells)
3457	{
3458	int hits = 0;
3459	stack<BspRayTraversalData> tStack;
3460
3461	float mint = 0.0f, maxt = 1.0f;
3462
3463	//ViewCell::NewMail();
3464
3465	Vector3 entp = origin;
3466	Vector3 extp = termination;
3467
3468	BspNode *node = mRoot;
3469	BspNode *farChild = NULL;
3470
3471	float t;
3472	const float thresh = 1e-6f; // matt: change this to adjustable value
3473
3474	while (1)
3475	{
3476	if (!node->IsLeaf())
3477	{
3478	BspInterior in = static_cast<BspInterior >(node);
3479
3480	Plane3 &splitPlane = in->GetPlane();
3481
3482	const int entSide = splitPlane.Side(entp, thresh);
3483	const int extSide = splitPlane.Side(extp, thresh);
3484
3485	if (entSide < 0)
3486	{
3487	node = in->GetBack();
3488
3489	// plane does not split ray => no far child
3490	if (extSide <= 0)
3491	continue;
3492
3493	farChild = in->GetFront(); // plane splits ray
3494	}
3495	else if (entSide > 0)
3496	{
3497	node = in->GetFront();
3498
3499	if (extSide >= 0) // plane does not split ray => no far child
3500	continue;
3501
3502	farChild = in->GetBack(); // plane splits ray
3503	}
3504	else // one of the ray end points is on the plane
3505	{
3506	// NOTE: what to do if ray is coincident with plane?
3507	if (extSide < 0)
3508	node = in->GetBack();
3509	else //if (extSide > 0)
3510	node = in->GetFront();
3511	//else break; // coincident => count no intersections
3512
3513	continue; // no far child
3514	}
3515
3516	// push data for far child
3517	tStack.push(BspRayTraversalData(farChild, extp));
3518
3519	// find intersection of ray segment with plane
3520	extp = splitPlane.FindIntersection(origin, extp, &t);
3521	}
3522	else
3523	{
3524	// reached leaf => intersection with view cell
3525	BspLeaf leaf = static_cast<BspLeaf >(node);
3526	ViewCell *viewCell;
3527
3528	// question: always contribute to leaf or to currently active view cell?
3529	// if (0)
3530	// viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3531	// else
3532	viewCell = leaf->GetViewCell();
3533
3534	if (!viewCell->Mailed())
3535	{
3536	viewcells.push_back(viewCell);
3537	viewCell->Mail();
3538	++ hits;
3539	}
3540
3541	//-- fetch the next far child from the stack
3542	if (tStack.empty())
3543	break;
3544
3545	entp = extp;
3546
3547	const BspRayTraversalData &s = tStack.top();
3548
3549	node = s.mNode;
3550	extp = s.mExitPoint;
3551
3552	tStack.pop();
3553	}
3554	}
3555
3556	return hits;
3557	}
3558
3559
3560
3561
3562	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
3563	{
3564	std::deque<BspNode *> path1;
3565	BspNode *p1 = n1;
3566
3567	// create path from node 1 to root
3568	while (p1)
3569	{
3570	if (p1 == n2) // second node on path
3571	return (int)path1.size();
3572
3573	path1.push_front(p1);
3574	p1 = p1->GetParent();
3575	}
3576
3577	int depth = n2->GetDepth();
3578	int d = depth;
3579
3580	BspNode *p2 = n2;
3581
3582	// compare with same depth
3583	while (1)
3584	{
3585	if ((d < (int)path1.size()) && (p2 == path1[d]))
3586	return (depth - d) + ((int)path1.size() - 1 - d);
3587
3588	-- d;
3589	p2 = p2->GetParent();
3590	}
3591
3592	return 0; // never come here
3593	}
3594
3595
3596	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
3597	{
3598	// TODO
3599	#if HAS_TO_BE_REDONE
3600	if (node->IsLeaf())
3601	return node;
3602
3603	BspInterior interior = static_cast<BspInterior >(node);
3604
3605	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
3606	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
3607
3608	if (front->IsLeaf() && back->IsLeaf())
3609	{
3610	BspLeaf frontLeaf = static_cast<BspLeaf >(front);
3611	BspLeaf backLeaf = static_cast<BspLeaf >(back);
3612
3613	//-- collapse tree
3614	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
3615	{
3616	BspViewCell *vc = frontLeaf->GetViewCell();
3617
3618	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
3619	leaf->SetTreeValid(frontLeaf->TreeValid());
3620
3621	// replace a link from node's parent
3622	if (leaf->GetParent())
3623	leaf->GetParent()->ReplaceChildLink(node, leaf);
3624	else
3625	mRoot = leaf;
3626
3627	++ collapsed;
3628	delete interior;
3629
3630	return leaf;
3631	}
3632	}
3633	#endif
3634	return node;
3635	}
3636
3637
3638	int VspBspTree::CollapseTree()
3639	{
3640	int collapsed = 0;
3641	//TODO
3642	#if HAS_TO_BE_REDONE
3643	(void)CollapseTree(mRoot, collapsed);
3644
3645	// revalidate leaves
3646	RepairViewCellsLeafLists();
3647	#endif
3648	return collapsed;
3649	}
3650
3651
3652	void VspBspTree::RepairViewCellsLeafLists()
3653	{
3654	// TODO
3655	#if HAS_TO_BE_REDONE
3656	// list not valid anymore => clear
3657	stack<BspNode *> nodeStack;
3658	nodeStack.push(mRoot);
3659
3660	ViewCell::NewMail();
3661
3662	while (!nodeStack.empty())
3663	{
3664	BspNode *node = nodeStack.top();
3665	nodeStack.pop();
3666
3667	if (node->IsLeaf())
3668	{
3669	BspLeaf leaf = static_cast<BspLeaf >(node);
3670
3671	BspViewCell *viewCell = leaf->GetViewCell();
3672
3673	if (!viewCell->Mailed())
3674	{
3675	viewCell->mLeaves.clear();
3676	viewCell->Mail();
3677	}
3678
3679	viewCell->mLeaves.push_back(leaf);
3680
3681	}
3682	else
3683	{
3684	BspInterior interior = static_cast<BspInterior >(node);
3685
3686	nodeStack.push(interior->GetFront());
3687	nodeStack.push(interior->GetBack());
3688	}
3689	}
3690	// TODO
3691	#endif
3692	}
3693
3694
3695	int VspBspTree::CastBeam(Beam &beam)
3696	{
3697	stack<bspNodePair> nodeStack;
3698	BspNodeGeometry *rgeom = new BspNodeGeometry();
3699	ConstructGeometry(mRoot, *rgeom);
3700
3701	nodeStack.push(bspNodePair(mRoot, rgeom));
3702
3703	ViewCell::NewMail();
3704
3705	while (!nodeStack.empty())
3706	{
3707	BspNode *node = nodeStack.top().first;
3708	BspNodeGeometry *geom = nodeStack.top().second;
3709	nodeStack.pop();
3710
3711	AxisAlignedBox3 box;
3712	geom->GetBoundingBox(box);
3713
3714	const int side = beam.ComputeIntersection(box);
3715
3716	switch (side)
3717	{
3718	case -1:
3719	CollectViewCells(node, true, beam.mViewCells, true);
3720	break;
3721	case 0:
3722
3723	if (node->IsLeaf())
3724	{
3725	BspLeaf leaf = static_cast<BspLeaf >(node);
3726
3727	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
3728	{
3729	leaf->GetViewCell()->Mail();
3730	beam.mViewCells.push_back(leaf->GetViewCell());
3731	}
3732	}
3733	else
3734	{
3735	BspInterior interior = static_cast<BspInterior >(node);
3736
3737	BspNode *first = interior->GetFront();
3738	BspNode *second = interior->GetBack();
3739
3740	BspNodeGeometry *firstGeom = new BspNodeGeometry();
3741	BspNodeGeometry *secondGeom = new BspNodeGeometry();
3742
3743	geom->SplitGeometry(*firstGeom,
3744	*secondGeom,
3745	interior->GetPlane(),
3746	mBoundingBox,
3747	//0.0000001f);
3748	mEpsilon);
3749
3750	// decide on the order of the nodes
3751	if (DotProd(beam.mPlanes[0].mNormal,
3752	interior->GetPlane().mNormal) > 0)
3753	{
3754	swap(first, second);
3755	swap(firstGeom, secondGeom);
3756	}
3757
3758	nodeStack.push(bspNodePair(first, firstGeom));
3759	nodeStack.push(bspNodePair(second, secondGeom));
3760	}
3761
3762	break;
3763	default:
3764	// default: cull
3765	break;
3766	}
3767
3768	DEL_PTR(geom);
3769
3770	}
3771
3772	return (int)beam.mViewCells.size();
3773	}
3774
3775
3776	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
3777	{
3778	mViewCellsManager = vcm;
3779	}
3780
3781
3782	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
3783	vector<MergeCandidate> &candidates)
3784	{
3785	BspLeaf::NewMail();
3786
3787	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
3788
3789	int numCandidates = 0;
3790
3791	// find merge candidates and push them into queue
3792	for (it = leaves.begin(); it != it_end; ++ it)
3793	{
3794	BspLeaf leaf = it;
3795
3796	// the same leaves must not be part of two merge candidates
3797	leaf->Mail();
3798
3799	vector<BspLeaf *> neighbors;
3800
3801	// appoximate neighbor search has slightl relaxed constraints
3802	if (1)
3803	FindNeighbors(leaf, neighbors, true);
3804	else
3805	FindApproximateNeighbors(leaf, neighbors, true);
3806
3807	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
3808
3809	// TODO: test if at least one ray goes from one leaf to the other
3810	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
3811	{
3812	if ((*nit)->GetViewCell() != leaf->GetViewCell())
3813	{
3814	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
3815
3816	if (!leaf->GetViewCell()->GetPvs().Empty() \|\|
3817	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
3818	leaf->IsSibling(*nit))
3819	{
3820	candidates.push_back(mc);
3821	}
3822
3823	++ numCandidates;
3824	if ((numCandidates % 1000) == 0)
3825	{
3826	cout << "collected " << numCandidates << " merge candidates" << endl;
3827	}
3828	}
3829	}
3830	}
3831
3832	Debug << "merge queue: " << (int)candidates.size() << endl;
3833	Debug << "leaves in queue: " << numCandidates << endl;
3834
3835
3836	return (int)leaves.size();
3837	}
3838
3839
3840	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
3841	vector<MergeCandidate> &candidates)
3842	{
3843	ViewCell::NewMail();
3844	long startTime = GetTime();
3845
3846	map<BspLeaf , vector<BspLeaf> > neighborMap;
3847	ViewCellContainer::const_iterator iit;
3848
3849	int numLeaves = 0;
3850
3851	BspLeaf::NewMail();
3852
3853	for (int i = 0; i < (int)rays.size(); ++ i)
3854	{
3855	VssRay *ray = rays[i];
3856
3857	// traverse leaves stored in the rays and compare and
3858	// merge consecutive leaves (i.e., the neighbors in the tree)
3859	if (ray->mViewCells.size() < 2)
3860	continue;
3861
3862	iit = ray->mViewCells.begin();
3863	BspViewCell bspVc = static_cast<BspViewCell >(*(iit ++));
3864	BspLeaf *leaf = bspVc->mLeaves[0];
3865
3866	// traverse intersections
3867	// consecutive leaves are neighbors => add them to queue
3868	for (; iit != ray->mViewCells.end(); ++ iit)
3869	{
3870	// next pair
3871	BspLeaf *prevLeaf = leaf;
3872	bspVc = static_cast<BspViewCell >(iit);
3873	leaf = bspVc->mLeaves[0]; // exactly one leaf
3874
3875	// view space not valid or same view cell
3876	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3877	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3878	continue;
3879
3880	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3881
3882	bool found = false;
3883
3884	// both leaves inserted in queue already =>
3885	// look if double pair already exists
3886	if (leaf->Mailed() && prevLeaf->Mailed())
3887	{
3888	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3889
3890	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3891	if (*it == prevLeaf)
3892	found = true; // already in queue
3893	}
3894
3895	if (!found)
3896	{
3897	// this pair is not in map yet
3898	// => insert into the neighbor map and the queue
3899	neighbors.push_back(prevLeaf);
3900	neighborMap[prevLeaf].push_back(leaf);
3901
3902	leaf->Mail();
3903	prevLeaf->Mail();
3904
3905	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3906
3907	candidates.push_back(mc);
3908
3909	if (((int)candidates.size() % 1000) == 0)
3910	{
3911	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3912	}
3913	}
3914	}
3915	}
3916
3917	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3918	Debug << "merge queue: " << (int)candidates.size() << endl;
3919	Debug << "leaves in queue: " << numLeaves << endl;
3920
3921
3922	//-- collect the leaves which haven't been found by ray casting
3923	if (0)
3924	{
3925	cout << "finding additional merge candidates using geometry" << endl;
3926	vector<BspLeaf *> leaves;
3927	CollectLeaves(leaves, true);
3928	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3929	CollectMergeCandidates(leaves, candidates);
3930	}
3931
3932	return numLeaves;
3933	}
3934
3935
3936
3937
3938	ViewCell *VspBspTree::GetViewCell(const Vector3 &point, const bool active)
3939	{
3940	if (mRoot == NULL)
3941	return NULL;
3942
3943	stack<BspNode *> nodeStack;
3944	nodeStack.push(mRoot);
3945
3946	ViewCellLeaf *viewcell = NULL;
3947
3948	while (!nodeStack.empty())
3949	{
3950	BspNode *node = nodeStack.top();
3951	nodeStack.pop();
3952
3953	if (node->IsLeaf())
3954	{
3955	viewcell = static_cast<BspLeaf *>(node)->GetViewCell();
3956	break;
3957	}
3958	else
3959	{
3960	BspInterior interior = static_cast<BspInterior >(node);
3961
3962	// random decision
3963	if (interior->GetPlane().Side(point) < 0)
3964	nodeStack.push(interior->GetBack());
3965	else
3966	nodeStack.push(interior->GetFront());
3967	}
3968	}
3969
3970	if (active)
3971	return mViewCellsTree->GetActiveViewCell(viewcell);
3972	else
3973	return viewcell;
3974	}
3975
3976
3977	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
3978	{
3979	BspNode *node = mRoot;
3980
3981	while (1)
3982	{
3983	// early exit
3984	if (node->TreeValid())
3985	return true;
3986
3987	if (node->IsLeaf())
3988	return false;
3989
3990	BspInterior in = static_cast<BspInterior >(node);
3991
3992	if (in->GetPlane().Side(viewPoint) <= 0)
3993	{
3994	node = in->GetBack();
3995	}
3996	else
3997	{
3998	node = in->GetFront();
3999	}
4000	}
4001
4002	// should never come here
4003	return false;
4004	}
4005
4006
4007	void VspBspTree::PropagateUpValidity(BspNode *node)
4008	{
4009	const bool isValid = node->TreeValid();
4010
4011	// propagative up invalid flag until only invalid nodes exist over this node
4012	if (!isValid)
4013	{
4014	while (!node->IsRoot() && node->GetParent()->TreeValid())
4015	{
4016	node = node->GetParent();
4017	node->SetTreeValid(false);
4018	}
4019	}
4020	else
4021	{
4022	// propagative up valid flag until one of the subtrees is invalid
4023	while (!node->IsRoot() && !node->TreeValid())
4024	{
4025	node = node->GetParent();
4026	BspInterior interior = static_cast<BspInterior >(node);
4027
4028	// the parent is valid iff both leaves are valid
4029	node->SetTreeValid(interior->GetBack()->TreeValid() &&
4030	interior->GetFront()->TreeValid());
4031	}
4032	}
4033	}
4034
4035
4036	bool VspBspTree::Export(OUT_STREAM &stream)
4037	{
4038	ExportNode(mRoot, stream);
4039	return true;
4040	}
4041
4042
4043	void VspBspTree::ExportNode(BspNode *node, OUT_STREAM &stream)
4044	{
4045	if (node->IsLeaf())
4046	{
4047	BspLeaf leaf = static_cast<BspLeaf >(node);
4048	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
4049
4050	int id = -1;
4051	if (viewCell != mOutOfBoundsCell)
4052	id = viewCell->GetId();
4053
4054	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
4055	}
4056	else
4057	{
4058	BspInterior interior = static_cast<BspInterior >(node);
4059
4060	Plane3 plane = interior->GetPlane();
4061	stream << "<Interior plane=\"" << plane.mNormal.x << " "
4062	<< plane.mNormal.y << " " << plane.mNormal.z << " "
4063	<< plane.mD << "\">" << endl;
4064
4065	ExportNode(interior->GetBack(), stream);
4066	ExportNode(interior->GetFront(), stream);
4067
4068	stream << "</Interior>" << endl;
4069	}
4070	}
4071
4072	}

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