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VspBspTree.cpp @ 2627

Revision 2627, 98.7 KB checked in by bittner, 17 years ago (diff)
commit before merge with vlastimil

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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	//////////////////////
121	//-- termination criteria for axis aligned split
122
123	Environment::GetSingleton()->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
124	mTermMaxRayContriForAxisAligned);
125	Environment::GetSingleton()->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
126	mTermMinRaysForAxisAligned);
127
128	Environment::GetSingleton()->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
129
130	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
131	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.renderCostDecreaseWeight", mRenderCostDecreaseWeight);
132	Environment::GetSingleton()->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
133
134	Environment::GetSingleton()->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
135	Environment::GetSingleton()->GetBoolValue("VspBspTree.useSplitCostQueue", mUseSplitCostQueue);
136	Environment::GetSingleton()->GetBoolValue("VspBspTree.simulateOctree", mCirculatingAxis);
137	Environment::GetSingleton()->GetBoolValue("VspBspTree.useRandomAxis", mUseRandomAxis);
138	Environment::GetSingleton()->GetIntValue("VspBspTree.nodePriorityQueueType", mNodePriorityQueueType);
139
140
141	char subdivisionStatsLog[100];
142	Environment::GetSingleton()->GetStringValue("VspBspTree.subdivisionStats", subdivisionStatsLog);
143	mSubdivisionStats.open(subdivisionStatsLog);
144
145	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.minBand", mMinBand);
146	Environment::GetSingleton()->GetFloatValue("VspBspTree.Construction.maxBand", mMaxBand);
147	Environment::GetSingleton()->GetBoolValue("VspBspTree.Construction.useDrivingAxisForMaxCost", mUseDrivingAxisIfMaxCostViolated);
148
149	/////////
150	//-- debug output
151
152	Debug << "***** VSP BSP options ****** " << endl;
153	Debug << "max depth: " << mTermMaxDepth << endl;
154	Debug << "min PVS: " << mTermMinPvs << endl;
155	Debug << "min probabiliy: " << mTermMinProbability << endl;
156	Debug << "min rays: " << mTermMinRays << endl;
157	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
158	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
159	Debug << "miss tolerance: " << mTermMissTolerance << endl;
160	Debug << "max view cells: " << mMaxViewCells << endl;
161	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
162	Debug << "randomize: " << randomize << endl;
163
164	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
165	Debug << "render cost weight: " << mRenderCostWeight << endl;
166	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
167	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
168	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
169	Debug << "max memory: " << mMaxMemory << endl;
170	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
171	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
172	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
173	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
174	Debug << "use random axis: " << mUseRandomAxis << endl;
175	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
176	Debug << "circulating axis: " << mCirculatingAxis << endl;
177	Debug << "minband: " << mMinBand << endl;
178	Debug << "maxband: " << mMaxBand << endl;
179	Debug << "use driving axis for max cost: " << mUseDrivingAxisIfMaxCostViolated << endl;
180	Debug << "render cost decrease weight: " << mRenderCostDecreaseWeight << endl;
181
182	Debug << "Split plane strategy: ";
183
184	if (mSplitPlaneStrategy & RANDOM_POLYGON)
185	{
186	Debug << "random polygon ";
187	}
188	if (mSplitPlaneStrategy & AXIS_ALIGNED)
189	{
190	Debug << "axis aligned ";
191	}
192	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
193	{
194	mCostNormalizer += mLeastRaySplitsFactor;
195	Debug << "least ray splits ";
196	}
197	if (mSplitPlaneStrategy & BALANCED_RAYS)
198	{
199	mCostNormalizer += mBalancedRaysFactor;
200	Debug << "balanced rays ";
201	}
202	if (mSplitPlaneStrategy & PVS)
203	{
204	mCostNormalizer += mPvsFactor;
205	Debug << "pvs";
206	}
207
208	Debug << endl;
209
210	mLocalSubdivisionCandidates = new vector<SortableEntry>;
211	}
212
213
214	BspViewCell *VspBspTree::GetOutOfBoundsCell()
215	{
216	return mOutOfBoundsCell;
217	}
218
219
220	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
221	{
222	if (!mOutOfBoundsCell)
223	{
224	mOutOfBoundsCell = new BspViewCell();
225	mOutOfBoundsCell->SetId(OUT_OF_BOUNDS_ID);
226	mOutOfBoundsCell->SetValid(false);
227	}
228
229	return mOutOfBoundsCell;
230	}
231
232
233	const BspTreeStatistics &VspBspTree::GetStatistics() const
234	{
235	return mBspStats;
236	}
237
238
239	VspBspTree::~VspBspTree()
240	{
241	DEL_PTR(mRoot);
242	DEL_PTR(mLocalSubdivisionCandidates);
243	}
244
245
246	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
247	PolygonContainer &polys) const
248	{
249	if (!mesh) return 0;
250
251	FaceContainer::const_iterator fi;
252
253	// copy the face data to polygons
254	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
255	{
256	Polygon3 poly = new Polygon3((fi), mesh);
257
258	if (poly->Valid(mEpsilon))
259	{
260	polys.push_back(poly);
261	}
262	else
263	{
264	DEL_PTR(poly);
265	}
266	}
267
268	return (int)mesh->mFaces.size();
269	}
270
271
272	void VspBspTree::ExtractPolygons(Intersectable *object, PolygonContainer &polys) const
273	{
274	// extract the polygons from the intersectables
275	switch (object->Type())
276	{
277	case Intersectable::MESH_INSTANCE:
278	{
279	Mesh mesh = static_cast<MeshInstance >(object)->GetMesh();
280	AddMeshToPolygons(mesh, polys);
281	}
282	break;
283	case Intersectable::VIEW_CELL:
284	{
285	Mesh mesh = static_cast<ViewCell >(object)->GetMesh();
286	AddMeshToPolygons(mesh, polys);
287	break;
288	}
289	case Intersectable::TRANSFORMED_MESH_INSTANCE:
290	{
291	TransformedMeshInstance *mi =
292	static_cast<TransformedMeshInstance *>(object);
293
294	Mesh mesh;
295	mi->GetTransformedMesh(mesh);
296	AddMeshToPolygons(&mesh, polys);
297	}
298	break;
299	case Intersectable::TRIANGLE_INTERSECTABLE:
300	{
301	TriangleIntersectable *intersect =
302	static_cast<TriangleIntersectable *>(object);
303
304	Polygon3 *poly = new Polygon3(intersect->GetItem());
305
306	if (poly->Valid(mEpsilon))
307	{
308	polys.push_back(poly);
309	}
310	else
311	{
312	delete poly;
313	}
314	}
315	break;
316	default:
317	Debug << "intersectable type not supported" << endl;
318	break;
319	}
320	}
321
322
323	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
324	PolygonContainer &polys,
325	int maxObjects)
326	{
327	const int limit = (maxObjects > 0) ?
328	Min((int)objects.size(), maxObjects) : (int)objects.size();
329
330	for (int i = 0; i < limit; ++i)
331	{
332	Intersectable object = objects[i];//it;
333	ExtractPolygons(object, polys);
334
335	// add to BSP tree aabb
336	mBoundingBox.Include(object->GetBox());
337	}
338
339	return (int)polys.size();
340	}
341
342
343	void VspBspTree::ComputeBoundingBox(const VssRayContainer &sampleRays,
344	AxisAlignedBox3 *forcedBoundingBox)
345	{
346	if (forcedBoundingBox)
347	{
348	mBoundingBox = *forcedBoundingBox;
349	}
350	else // compute vsp tree bounding box
351	{
352	mBoundingBox.Initialize();
353
354	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
355
356	//-- compute bounding box
357	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
358	{
359	VssRay ray = rit;
360
361	// compute bounding box of view space
362	mBoundingBox.Include(ray->GetTermination());
363	mBoundingBox.Include(ray->GetOrigin());
364	}
365	}
366	}
367
368
369	void VspBspTree::Construct(const VssRayContainer &sampleRays,
370	AxisAlignedBox3 *forcedBoundingBox)
371	{
372	// Compute the bounding box from the rays
373	ComputeBoundingBox(sampleRays, forcedBoundingBox);
374
375	PolygonContainer polys;
376	RayInfoContainer *rays = new RayInfoContainer();
377
378	////////////
379	//-- extract polygons from rays if polygon candidate planes are required
380
381	if (mMaxPolyCandidates)
382	{
383	int numObj = 0;
384	Intersectable::NewMail();
385
386	cout << "Extracting polygons from rays ... ";
387	const long startTime = GetTime();
388
389	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
390
391	//-- extract polygons intersected by the rays
392	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
393	{
394	VssRay ray = rit;
395	Intersectable *obj = ray->mTerminationObject;
396
397	++ numObj;
398
399	/////////
400	//-- compute bounding box
401
402	if (!forcedBoundingBox)
403	{
404	mBoundingBox.Include(ray->mTermination);
405	}
406
407	if ((mBoundingBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
408	ray->mOriginObject &&
409	!ray->mOriginObject->Mailed())
410	{
411	ray->mOriginObject->Mail();
412	ExtractPolygons(ray->mOriginObject, polys);
413
414	++ numObj;
415	}
416	}
417
418	// throw out unnecessary polygons
419	PreprocessPolygons(polys);
420	cout << "finished" << endl;
421
422	Debug << "\n" << (int)polys.size() << " polys extracted from "
423	<< (int)sampleRays.size() << " rays in "
424	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
425	}
426
427	Debug << "maximal pvs (i.e., pvs still considered as valid): "
428	<< mViewCellsManager->GetMaxPvsSize() << endl;
429
430	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
431
432	/////////
433	//-- store rays
434	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
435	{
436	VssRay ray = rit;
437
438	float minT, maxT;
439
440	static Ray hray;
441	hray.Init(*ray);
442
443	// TODO: not very efficient to implictly cast between rays types
444	if (mBoundingBox.GetRaySegment(hray, minT, maxT))
445	{
446	float len = ray->Length();
447
448	if (!len)
449	len = Limits::Small;
450
451	rays->push_back(RayInfo(ray, minT / len, maxT / len));
452	}
453	}
454
455	if (mUseAreaForPvs)
456	mTermMinProbability *= mBoundingBox.SurfaceArea();
457	else // normalize volume
458	mTermMinProbability *= mBoundingBox.GetVolume();
459
460	mBspStats.nodes = 1;
461	mBspStats.polys = (int)polys.size();
462	mBspStats.mGlobalCostMisses = 0;
463
464
465	// use split cost priority queue
466	if (mUseSplitCostQueue)
467	{
468	ConstructWithSplitQueue(polys, rays);
469	}
470	else
471	{
472	Construct(polys, rays);
473	}
474
475	// clean up polygons
476	CLEAR_CONTAINER(polys);
477	}
478
479
480	// TODO: return memory usage in MB
481	float VspBspTree::GetMemUsage() const
482	{
483	return (float)
484	(sizeof(VspBspTree) +
485	mBspStats.Leaves() * sizeof(BspLeaf) +
486	mCreatedViewCells * sizeof(BspViewCell) +
487	mBspStats.pvs * sizeof(PvsData) +
488	mBspStats.Interior() * sizeof(BspInterior) +
489	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
490	}
491
492
493	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
494	{
495	VspBspTraversalQueue tQueue;
496
497	/// create new vsp tree
498	mRoot = new BspLeaf();
499
500	// constrruct root node geometry
501	BspNodeGeometry *geom = new BspNodeGeometry();
502	ConstructGeometry(mRoot, *geom);
503
504	/// we use the overall probability as normalizer
505	/// either the overall area or the volume
506	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
507
508	/// first traversal data
509	VspBspTraversalData tData(mRoot,
510	new PolygonContainer(polys),
511	0,
512	rays,
513	ComputePvsSize(*rays),
514	prop,
515	geom);
516
517	// evaluate the priority of this traversal data
518	EvalPriority(tData);
519
520	// first node is kd node, i.e. an axis aligned box
521	if (1)
522	tData.mIsKdNode = true;
523	else
524	tData.mIsKdNode = false;
525
526	tQueue.push(tData);
527
528
529	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
530	mTotalPvsSize = tData.mPvs;
531
532	// first subdivison statistics
533	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
534
535	mBspStats.Start();
536	cout << "Constructing vsp bsp tree ... \n";
537
538	const long startTime = GetTime();
539	// used for intermediate time measurements and progress
540	long interTime = GetTime();
541
542	int nLeaves = 500;
543	int nViewCells = 500;
544
545	mOutOfMemory = false;
546	mCreatedViewCells = 0;
547
548	while (!tQueue.empty())
549	{
550	tData = tQueue.top();
551	tQueue.pop();
552
553	if (0 && !mOutOfMemory)
554	{
555	float mem = GetMemUsage();
556
557	if (mem > mMaxMemory)
558	{
559	mOutOfMemory = true;
560	Debug << "memory limit reached: " << mem << endl;
561	}
562	}
563
564	// subdivide leaf node
565	const BspNode *r = Subdivide(tQueue, tData);
566
567	if (r == mRoot)
568	Debug << "VSP BSP tree construction time spent at root: "
569	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
570
571	if (mBspStats.Leaves() >= nLeaves)
572	{
573	nLeaves += 500;
574
575	cout << "leaves=" << mBspStats.Leaves() << endl;
576	Debug << "needed "
577	<< TimeDiff(interTime, GetTime())*1e-3
578	<< " secs to create 500 view cells" << endl;
579	interTime = GetTime();
580	}
581
582	if (mCreatedViewCells >= nViewCells)
583	{
584	nViewCells += 500;
585
586	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
587	}
588	}
589
590	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
591	cout << "finished in " << TimeDiff(startTime, GetTime())*1e-3 << "secs" << endl;
592
593	mBspStats.Stop();
594	}
595
596
597
598	void VspBspTree::ConstructWithSplitQueue(const PolygonContainer &polys,
599	RayInfoContainer *rays)
600	{
601	VspBspSplitQueue tQueue;
602
603	mRoot = new BspLeaf();
604
605	// constrruct root node geometry
606	BspNodeGeometry *geom = new BspNodeGeometry();
607	ConstructGeometry(mRoot, *geom);
608
609	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
610
611	VspBspTraversalData tData(mRoot,
612	new PolygonContainer(polys),
613	0,
614	rays,
615	ComputePvsSize(*rays),
616	prop,
617	geom);
618
619
620	// first node is kd node, i.e. an axis aligned box
621	if (1)
622	tData.mIsKdNode = true;
623	else
624	tData.mIsKdNode = false;
625
626	// compute first split candidate
627	VspBspSubdivisionCandidate splitCandidate;
628	splitCandidate.mParentData = tData;
629
630	EvalSubdivisionCandidate(splitCandidate);
631
632	tQueue.push(splitCandidate);
633
634	mTotalCost = tData.mPvs * tData.mProbability / mBoundingBox.GetVolume();
635	mTotalPvsSize = tData.mPvs;
636
637	// first subdivison statistics
638	AddSubdivisionStats(1, 0, 0, mTotalCost, (float)mTotalPvsSize);
639
640	mBspStats.Start();
641	cout << "Constructing vsp bsp tree ... \n";
642
643	long startTime = GetTime();
644	int nLeaves = 500;
645	int nViewCells = 500;
646
647	// used for intermediate time measurements and progress
648	long interTime = GetTime();
649
650	mOutOfMemory = false;
651
652	mCreatedViewCells = 0;
653
654	while (!tQueue.empty())
655	{
656	splitCandidate = tQueue.top();
657	tQueue.pop();
658
659	// cost ratio of cost decrease / totalCost
660	float costRatio = splitCandidate.mRenderCostDecr / mTotalCost;
661
662	//Debug << "cost ratio: " << costRatio << endl;
663	if (costRatio < mTermMinGlobalCostRatio)
664	{
665	++ mBspStats.mGlobalCostMisses;
666	}
667
668	if (0 && !mOutOfMemory)
669	{
670	float mem = GetMemUsage();
671	if (mem > mMaxMemory)
672	{
673	mOutOfMemory = true;
674	Debug << "memory limit reached: " << mem << endl;
675	}
676	}
677
678	// subdivide leaf node
679	BspNode *r = Subdivide(tQueue, splitCandidate);
680
681	if (r == mRoot)
682	{
683	cout << "VSP BSP tree construction time spent at root: "
684	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
685	}
686
687	if (mBspStats.Leaves() >= nLeaves)
688	{
689	nLeaves += 500;
690
691	cout << "leaves=" << mBspStats.Leaves() << endl;
692	Debug << "needed "
693	<< TimeDiff(interTime, GetTime())*1e-3
694	<< " secs to create 500 view cells" << endl;
695	interTime = GetTime();
696	}
697
698	if (mCreatedViewCells == nViewCells)
699	{
700	nViewCells += 500;
701	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
702	}
703	}
704
705	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
706	cout << "finished\n";
707
708	mBspStats.Stop();
709	}
710
711
712	bool VspBspTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
713	{
714	return
715	(((int)data.mRays->size() <= mTermMinRays) \|\|
716	(data.mPvs <= mTermMinPvs) \|\|
717	(data.mProbability <= mTermMinProbability) \|\|
718	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
719	(data.mDepth >= mTermMaxDepth));
720	}
721
722
723	void VspBspTree::AddSubdivisionStats(const int viewCells,
724	const float renderCostDecr,
725	const float splitCandidateCost,
726	const float totalRenderCost,
727	const float avgRenderCost)
728	{
729	mSubdivisionStats
730	<< "#ViewCells\n" << viewCells << endl
731	<< "#RenderCostDecrease\n" << renderCostDecr << endl
732	<< "#SubdivisionCandidateCost\n" << splitCandidateCost << endl
733	<< "#TotalRenderCost\n" << totalRenderCost << endl
734	<< "#AvgRenderCost\n" << avgRenderCost << endl;
735	}
736
737
738	bool VspBspTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
739	{
740	return
741	(0
742	\|\| mOutOfMemory
743	\|\| (mBspStats.Leaves() >= mMaxViewCells)
744	\|\| (mBspStats.mGlobalCostMisses >= mTermGlobalCostMissTolerance)
745	);
746	}
747
748
749	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
750	VspBspTraversalData &tData)
751	{
752	BspNode *newNode = tData.mNode;
753
754	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
755	{
756	PolygonContainer coincident;
757
758	VspBspTraversalData tFrontData;
759	VspBspTraversalData tBackData;
760
761	// create new interior node and two leaf nodes
762	// or return leaf as it is (if maxCostRatio missed)
763	int splitAxis;
764	bool splitFurther = true;
765	int maxCostMisses = tData.mMaxCostMisses;
766
767	Plane3 splitPlane;
768	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
769
770	// choose next split plane
771	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
772	{
773	++ maxCostMisses;
774
775	if (maxCostMisses > mTermMissTolerance)
776	{
777	// terminate branch because of max cost
778	++ mBspStats.maxCostNodes;
779	splitFurther = false;
780	}
781	}
782
783	// if this a valid split => subdivide this node further
784
785	if (splitFurther)
786	{
787	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
788
789	if (splitAxis < 3)
790	++ mBspStats.splits[splitAxis];
791	else
792	++ mBspStats.polySplits;
793
794	// if it was a kd node (i.e., a box) and the split axis is axis aligned, it is still a kd node
795	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
796
797	tFrontData.mAxis = tBackData.mAxis = splitAxis;
798
799	// how often was max cost ratio missed in this branch?
800	tFrontData.mMaxCostMisses = maxCostMisses;
801	tBackData.mMaxCostMisses = maxCostMisses;
802
803	EvalPriority(tFrontData);
804	EvalPriority(tBackData);
805
806	// evaluate subdivision stats
807	if (1)
808	EvalSubdivisionStats(tData, tFrontData, tBackData);
809
810
811	// push the children on the stack
812	tQueue.push(tFrontData);
813	tQueue.push(tBackData);
814
815	// delete old leaf node
816	DEL_PTR(tData.mNode);
817	}
818	}
819
820	//-- terminate traversal and create new view cell
821	if (newNode->IsLeaf())
822	{
823	BspLeaf leaf = static_cast<BspLeaf >(newNode);
824
825	BspViewCell *viewCell = new BspViewCell();
826	leaf->SetViewCell(viewCell);
827
828	if (STORE_PVS)
829	{
830	//////////
831	//-- update pvs
832
833	int conSamp = 0;
834	float sampCon = 0.0f;
835
836	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
837
838	// update scalar pvs size lookup
839	ObjectPvs &pvs = viewCell->GetPvs();
840	mViewCellsManager->UpdateScalarPvsSize(viewCell, pvs.EvalPvsCost(), pvs.GetSize());
841
842	mBspStats.contributingSamples += conSamp;
843	mBspStats.sampleContributions += (int)sampCon;
844	}
845
846	//////////
847	//-- store additional info
848
849	if (mStoreRays)
850	{
851	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
852	for (it = tData.mRays->begin(); it != it_end; ++ it)
853	{
854	(*it).mRay->Ref();
855	leaf->mVssRays.push_back((*it).mRay);
856	}
857	}
858
859	// should I check here?
860	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0,
861	mViewCellsManager->GetMaxPvsSize()))
862	{
863	viewCell->SetValid(false);
864	leaf->SetTreeValid(false);
865	PropagateUpValidity(leaf);
866
867	++ mBspStats.invalidLeaves;
868	}
869
870	viewCell->mLeaves.push_back(leaf);
871
872	if (mUseAreaForPvs)
873	viewCell->SetArea(tData.mProbability);
874	else
875	viewCell->SetVolume(tData.mProbability);
876
877	leaf->mProbability = tData.mProbability;
878
879	// finally evaluate stats until this leaf
880	if (0)
881	EvaluateLeafStats(tData);
882	}
883
884	//-- cleanup
885	tData.Clear();
886
887	return newNode;
888	}
889
890
891	// subdivide node using a split plane queue
892	BspNode *VspBspTree::Subdivide(VspBspSplitQueue &tQueue,
893	VspBspSubdivisionCandidate &splitCandidate)
894	{
895	VspBspTraversalData &tData = splitCandidate.mParentData;
896
897	BspNode *newNode = tData.mNode;
898
899	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
900	{
901	PolygonContainer coincident;
902
903	VspBspTraversalData tFrontData;
904	VspBspTraversalData tBackData;
905
906	////////////////////
907	//-- continue subdivision
908
909	// create new interior node and two leaf node
910	const Plane3 splitPlane = splitCandidate.mSplitPlane;
911
912	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
913
914	const int splitAxis = splitCandidate.mSplitAxis;
915	const int maxCostMisses = splitCandidate.mMaxCostMisses;
916
917	if (splitAxis < 3)
918	++ mBspStats.splits[splitAxis];
919	else
920	++ mBspStats.polySplits;
921
922	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
923	tFrontData.mAxis = tBackData.mAxis = splitAxis;
924
925	// how often was max cost ratio missed in this branch?
926	tFrontData.mMaxCostMisses = maxCostMisses;
927	tBackData.mMaxCostMisses = maxCostMisses;
928
929	// statistics
930	if (1)
931	{
932	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
933	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
934	const float cData = (float)tData.mPvs * tData.mProbability;
935
936	const float costDecr =
937	(cFront + cBack - cData) / mBoundingBox.GetVolume();
938
939	mTotalCost += costDecr;
940	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
941
942	AddSubdivisionStats(mBspStats.Leaves(),
943	-costDecr,
944	splitCandidate.GetPriority(),
945	mTotalCost,
946	(float)mTotalPvsSize / (float)mBspStats.Leaves());
947	}
948
949	////////////
950	//-- push the new split candidates on the stack
951
952	VspBspSubdivisionCandidate frontCandidate;
953	frontCandidate.mParentData = tFrontData;
954
955	VspBspSubdivisionCandidate backCandidate;
956	backCandidate.mParentData = tBackData;
957
958	EvalSubdivisionCandidate(frontCandidate);
959	EvalSubdivisionCandidate(backCandidate);
960
961	cout << "f cost: " << frontCandidate.mPriority << " " << frontCandidate.mRenderCostDecr << endl;
962	cout << "b cost: " << backCandidate.mPriority << " " << backCandidate.mRenderCostDecr << endl;
963	tQueue.push(frontCandidate);
964	tQueue.push(backCandidate);
965
966	// delete old leaf node
967	DEL_PTR(tData.mNode);
968	}
969
970
971	//////////////////
972	//-- terminate traversal and create new view cell
973
974	if (newNode->IsLeaf())
975	{
976	BspLeaf leaf = static_cast<BspLeaf >(newNode);
977
978	BspViewCell *viewCell = new BspViewCell();
979	leaf->SetViewCell(viewCell);
980
981	if (STORE_PVS)
982	{
983	/////////
984	//-- update pvs
985
986	int conSamp = 0;
987	float sampCon = 0.0f;
988
989	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
990
991	// update scalar pvs size value
992	ObjectPvs &pvs = viewCell->GetPvs();
993	mViewCellsManager->UpdateScalarPvsSize(viewCell,
994	pvs.EvalPvsCost(),
995	pvs.GetSize());
996
997	mBspStats.contributingSamples += conSamp;
998	mBspStats.sampleContributions += (int)sampCon;
999	}
1000
1001	viewCell->mLeaves.push_back(leaf);
1002
1003	///////////
1004	//-- store additional info
1005
1006	if (mStoreRays)
1007	{
1008	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
1009	for (it = tData.mRays->begin(); it != it_end; ++ it)
1010	{
1011	(*it).mRay->Ref();
1012	leaf->mVssRays.push_back((*it).mRay);
1013	}
1014	}
1015
1016	if (mUseAreaForPvs)
1017	viewCell->SetArea(tData.mProbability);
1018	else
1019	viewCell->SetVolume(tData.mProbability);
1020
1021	leaf->mProbability = tData.mProbability;
1022
1023	// finally evaluate stats for this leaf
1024	if (1)
1025	EvaluateLeafStats(tData);
1026	}
1027
1028	//-- cleanup
1029	tData.Clear();
1030
1031	return newNode;
1032	}
1033
1034
1035	void VspBspTree::EvalPriority(VspBspTraversalData &tData) const
1036	{
1037	switch (mNodePriorityQueueType)
1038	{
1039	case BREATH_FIRST:
1040	tData.mPriority = (float)-tData.mDepth;
1041	break;
1042	case DEPTH_FIRST:
1043	tData.mPriority = (float)tData.mDepth;
1044	break;
1045	default:
1046	tData.mPriority = tData.mPvs * tData.mProbability;
1047	//Debug << "priority: " << tData.mPriority << endl;
1048	break;
1049	}
1050	}
1051
1052
1053	void VspBspTree::EvalSubdivisionCandidate(VspBspSubdivisionCandidate &splitCandidate)
1054	{
1055	VspBspTraversalData frontData;
1056	VspBspTraversalData backData;
1057
1058	BspLeaf leaf = static_cast<BspLeaf >(splitCandidate.mParentData.mNode);
1059
1060	// compute locally best split plane
1061	const bool costRatioViolated =
1062	SelectPlane(splitCandidate.mSplitPlane,
1063	leaf,
1064	splitCandidate.mParentData,
1065	frontData,
1066	backData,
1067	splitCandidate.mSplitAxis);
1068
1069	// max cost threshold violated?
1070	splitCandidate.mMaxCostMisses = costRatioViolated ? splitCandidate.mParentData.mMaxCostMisses :
1071	splitCandidate.mParentData.mMaxCostMisses + 1;
1072
1073	float oldRenderCost;
1074
1075	// compute global decrease in render cost
1076	const float renderCostDecr = EvalRenderCostDecrease(splitCandidate.mSplitPlane,
1077	splitCandidate.mParentData,
1078	oldRenderCost);
1079
1080	splitCandidate.mRenderCostDecr = renderCostDecr;
1081
1082	// TODO: geometry could be reused
1083	delete frontData.mGeometry;
1084	delete backData.mGeometry;
1085
1086	// set priority for queue
1087	#if 0
1088	const float priority = (float)-data.mDepth;
1089	#else
1090
1091	// take render cost of node into account
1092	// otherwise danger of being stuck in a local minimum!!
1093	const float factor = mRenderCostDecreaseWeight;
1094	const float priority = factor * renderCostDecr + (1.0f - factor) * oldRenderCost;
1095	#endif
1096
1097	splitCandidate.mPriority = priority;
1098	}
1099
1100
1101	void VspBspTree::EvalSubdivisionStats(const VspBspTraversalData &tData,
1102	const VspBspTraversalData &tFrontData,
1103	const VspBspTraversalData &tBackData)
1104	{
1105	const float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
1106	const float cBack = (float)tBackData.mPvs * tBackData.mProbability;
1107	const float cData = (float)tData.mPvs * tData.mProbability;
1108
1109	const float costDecr =
1110	(cFront + cBack - cData) / mBoundingBox.GetVolume();
1111
1112	mTotalCost += costDecr;
1113	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
1114
1115	AddSubdivisionStats(mBspStats.Leaves(),
1116	-costDecr,
1117	0,
1118	mTotalCost,
1119	(float)mTotalPvsSize / (float)mBspStats.Leaves());
1120	}
1121
1122
1123	BspInterior *VspBspTree::SubdivideNode(const Plane3 &splitPlane,
1124	VspBspTraversalData &tData,
1125	VspBspTraversalData &frontData,
1126	VspBspTraversalData &backData,
1127	PolygonContainer &coincident)
1128	{
1129	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
1130
1131	//-- the front and back traversal data is filled with the new values
1132	frontData.mDepth = tData.mDepth + 1;
1133	frontData.mPolygons = new PolygonContainer();
1134	frontData.mRays = new RayInfoContainer();
1135
1136	backData.mDepth = tData.mDepth + 1;
1137	backData.mPolygons = new PolygonContainer();
1138	backData.mRays = new RayInfoContainer();
1139
1140
1141	//-- subdivide rays
1142	SplitRays(splitPlane,
1143	*tData.mRays,
1144	*frontData.mRays,
1145	*backData.mRays);
1146
1147
1148	// compute pvs
1149	frontData.mPvs = ComputePvsSize(*frontData.mRays);
1150	backData.mPvs = ComputePvsSize(*backData.mRays);
1151
1152	// split front and back node geometry and compute area
1153
1154	// if geometry was not already computed
1155	if (!frontData.mGeometry && !backData.mGeometry)
1156	{
1157	frontData.mGeometry = new BspNodeGeometry();
1158	backData.mGeometry = new BspNodeGeometry();
1159
1160	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
1161	*backData.mGeometry,
1162	splitPlane,
1163	mBoundingBox,
1164	//0.0f);
1165	mEpsilon);
1166
1167	if (mUseAreaForPvs)
1168	{
1169	frontData.mProbability = frontData.mGeometry->GetArea();
1170	backData.mProbability = backData.mGeometry->GetArea();
1171	}
1172	else
1173	{
1174	frontData.mProbability = frontData.mGeometry->GetVolume();
1175	backData.mProbability = tData.mProbability - frontData.mProbability;
1176
1177	// should never come here: wrong volume !!!
1178	if (0)
1179	{
1180	if (frontData.mProbability < -0.00001)
1181	Debug << "fatal error f: " << frontData.mProbability << endl;
1182	if (backData.mProbability < -0.00001)
1183	Debug << "fatal error b: " << backData.mProbability << endl;
1184
1185	// clamp because of precision issues
1186	if (frontData.mProbability < 0) frontData.mProbability = 0;
1187	if (backData.mProbability < 0) backData.mProbability = 0;
1188	}
1189	}
1190	}
1191
1192
1193	// subdivide polygons
1194	SplitPolygons(splitPlane,
1195	*tData.mPolygons,
1196	*frontData.mPolygons,
1197	*backData.mPolygons,
1198	coincident);
1199
1200
1201
1202	///////////////////////////////////////
1203	// subdivide further
1204
1205	// store maximal and minimal depth
1206	if (tData.mDepth > mBspStats.maxDepth)
1207	{
1208	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
1209	mBspStats.maxDepth = tData.mDepth;
1210	}
1211
1212	mBspStats.nodes += 2;
1213
1214
1215	BspInterior *interior = new BspInterior(splitPlane);
1216
1217	#ifdef GTP_DEBUG
1218	Debug << interior << endl;
1219	#endif
1220
1221
1222	//-- create front and back leaf
1223
1224	BspInterior *parent = leaf->GetParent();
1225
1226	// replace a link from node's parent
1227	if (parent)
1228	{
1229	parent->ReplaceChildLink(leaf, interior);
1230	interior->SetParent(parent);
1231	}
1232	else // new root
1233	{
1234	mRoot = interior;
1235	}
1236
1237	// and setup child links
1238	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
1239
1240	frontData.mNode = interior->GetFront();
1241	backData.mNode = interior->GetBack();
1242
1243	interior->mTimeStamp = mTimeStamp ++;
1244
1245
1246	//DEL_PTR(leaf);
1247	return interior;
1248	}
1249
1250
1251	void VspBspTree::AddToPvs(BspLeaf *leaf,
1252	const RayInfoContainer &rays,
1253	float &sampleContributions,
1254	int &contributingSamples)
1255	{
1256	sampleContributions = 0;
1257	contributingSamples = 0;
1258
1259	RayInfoContainer::const_iterator it, it_end = rays.end();
1260
1261	ViewCellLeaf *vc = leaf->GetViewCell();
1262
1263	// add contributions from samples to the PVS
1264	for (it = rays.begin(); it != it_end; ++ it)
1265	{
1266	float sc = 0.0f;
1267	VssRay ray = (it).mRay;
1268
1269	bool madeContrib = false;
1270	float contribution;
1271
1272	if (ray->mTerminationObject)
1273	{
1274	if (vc->AddPvsSample(ray->mTerminationObject, ray->mPdf, contribution))
1275	madeContrib = true;
1276	sc += contribution;
1277	}
1278
1279	// only count termination objects?
1280	#if COUNT_ORIGIN_OBJECTS
1281
1282	if (ray->mOriginObject)
1283	{
1284	if (vc->AddPvsSample(ray->mOriginObject, ray->mPdf, contribution))
1285	madeContrib = true;
1286
1287	sc += contribution;
1288	}
1289	#endif
1290	sampleContributions += sc;
1291
1292	if (madeContrib)
1293	++ contributingSamples;
1294	}
1295	}
1296
1297
1298	void VspBspTree::SortSubdivisionCandidates(const RayInfoContainer &rays,
1299	const int axis,
1300	float minBand,
1301	float maxBand)
1302	{
1303	mLocalSubdivisionCandidates->clear();
1304
1305	const int requestedSize = 2 * (int)(rays.size());
1306
1307	// creates a sorted split candidates array
1308	if (mLocalSubdivisionCandidates->capacity() > 500000 &&
1309	requestedSize < (int)(mLocalSubdivisionCandidates->capacity() / 10) )
1310	{
1311	delete mLocalSubdivisionCandidates;
1312	mLocalSubdivisionCandidates = new vector<SortableEntry>;
1313	}
1314
1315	mLocalSubdivisionCandidates->reserve(requestedSize);
1316
1317	if (0)
1318	{ // float values => don't compare with exact values
1319	minBand += Limits::Small;
1320	maxBand -= Limits::Small;
1321	}
1322
1323	// insert all queries
1324	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
1325	{
1326	const bool positive = (*ri).mRay->HasPosDir(axis);
1327	float pos = (*ri).ExtrapOrigin(axis);
1328
1329	// clamp to min / max band
1330	if (0) ClipValue(pos, minBand, maxBand);
1331
1332	mLocalSubdivisionCandidates->
1333	push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
1334	pos, (*ri).mRay));
1335
1336	pos = (*ri).ExtrapTermination(axis);
1337
1338	// clamp to min / max band
1339	if (0) ClipValue(pos, minBand, maxBand);
1340
1341	mLocalSubdivisionCandidates->
1342	push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
1343	pos, (*ri).mRay));
1344	}
1345
1346	stable_sort(mLocalSubdivisionCandidates->begin(), mLocalSubdivisionCandidates->end());
1347	}
1348
1349
1350	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
1351	const AxisAlignedBox3 &box,
1352	const int pvsSize,
1353	const int axis,
1354	float &position)
1355	{
1356	RayInfoContainer usedRays;
1357
1358	if (mMaxTests < (int)rays.size())
1359	{
1360	GetRayInfoSets(rays, mMaxTests, usedRays);
1361	}
1362	else
1363	{
1364	usedRays = rays;
1365	}
1366
1367	const float minBox = box.Min(axis);
1368	const float maxBox = box.Max(axis);
1369
1370	const float sizeBox = maxBox - minBox;
1371
1372	const float minBand = minBox + mMinBand * sizeBox;
1373	const float maxBand = minBox + mMaxBand * sizeBox;
1374
1375	SortSubdivisionCandidates(usedRays, axis, minBand, maxBand);
1376
1377	//////////////////
1378	// go through the lists, count the number of objects left and right
1379	// and evaluate the following cost funcion:
1380	// C = ct_div_ci + (qlrl + qrrr)/queries
1381
1382	float pvsl = 0;
1383	float pvsr = (float)pvsSize;
1384
1385	float pvsBack = pvsl;
1386	float pvsFront = pvsr;
1387
1388	float sum = (float)pvsSize * sizeBox;
1389	float minSum = 1e20f;
1390
1391	// if no border can be found, take mid split
1392	position = minBox + 0.5f * sizeBox;
1393
1394	// the relative cost ratio
1395	float ratio = 99999999.0f;
1396	bool splitPlaneFound = false;
1397
1398	Intersectable::NewMail();
1399	RayInfoContainer::const_iterator ri, ri_end = usedRays.end();
1400
1401	// set all object as belonging to the front pvs
1402	for(ri = usedRays.begin(); ri != ri_end; ++ ri)
1403	{
1404	Intersectable oObject = (ri).mRay->mOriginObject;
1405	Intersectable tObject = (ri).mRay->mTerminationObject;
1406
1407	#if COUNT_ORIGIN_OBJECTS
1408
1409	if (oObject)
1410	{
1411	if (!oObject->Mailed())
1412	{
1413	oObject->Mail();
1414	oObject->mCounter = 1;
1415	}
1416	else
1417	{
1418	++ oObject->mCounter;
1419	}
1420	}
1421	#endif
1422
1423	if (tObject)
1424	{
1425	if (!tObject->Mailed())
1426	{
1427	tObject->Mail();
1428	tObject->mCounter = 1;
1429	}
1430	else
1431	{
1432	++ tObject->mCounter;
1433	}
1434	}
1435	}
1436
1437	Intersectable::NewMail();
1438	vector<SortableEntry>::const_iterator ci, ci_end = mLocalSubdivisionCandidates->end();
1439
1440	for (ci = mLocalSubdivisionCandidates->begin(); ci != ci_end; ++ ci)
1441	{
1442	VssRay *ray;
1443	ray = (*ci).ray;
1444
1445	Intersectable *oObject = ray->mOriginObject;
1446	Intersectable *tObject = ray->mTerminationObject;
1447
1448	switch ((*ci).type)
1449	{
1450	case SortableEntry::ERayMin:
1451	{
1452	#if COUNT_ORIGIN_OBJECTS
1453	if (oObject && !oObject->Mailed())
1454	{
1455	oObject->Mail();
1456	++ pvsl;
1457	}
1458	#endif
1459	if (tObject && !tObject->Mailed())
1460	{
1461	tObject->Mail();
1462	++ pvsl;
1463	}
1464
1465	break;
1466	}
1467	case SortableEntry::ERayMax:
1468	{
1469	#if COUNT_ORIGIN_OBJECTS
1470	if (oObject)
1471	{
1472	if (-- oObject->mCounter == 0)
1473	-- pvsr;
1474	}
1475	#endif
1476	if (tObject)
1477	{
1478	if (-- tObject->mCounter == 0)
1479	-- pvsr;
1480	}
1481
1482	break;
1483	}
1484	}
1485
1486
1487	// Note: we compare size of bounding boxes of front and back side because
1488	// of efficiency reasons (otherwise a new geometry would have to be computed
1489	// in each step and incremential evaluation would be difficult.
1490	// but then errors happen if the geometry is not an axis aligned box
1491	// (i.e., if a geometry aligned split was taken before)
1492	// question: is it sufficient to make this approximation?
1493	if (((ci).value >= minBand) && ((ci).value <= maxBand))
1494	{
1495	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
1496
1497	float currentPos;
1498
1499	// HACK: current positition is BETWEEN visibility events
1500	if (0 && ((ci + 1) != ci_end))
1501	{
1502	currentPos = ((ci).value + ((ci + 1)).value) * 0.5f;
1503	}
1504	else
1505	currentPos = (*ci).value;
1506
1507	//Debug << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
1508	//Debug << "cost= " << sum << endl;
1509
1510	if (sum < minSum)
1511	{
1512	splitPlaneFound = true;
1513
1514	minSum = sum;
1515	position = currentPos;
1516
1517	pvsBack = pvsl;
1518	pvsFront = pvsr;
1519	}
1520	}
1521	}
1522
1523	///////
1524	//-- compute cost
1525
1526	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
1527	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
1528
1529	const float pOverall = sizeBox;
1530
1531	const float pBack = position - minBox;
1532	const float pFront = maxBox - position;
1533
1534	const float penaltyOld = EvalPvsPenalty((float)pvsSize, lowerPvsLimit, upperPvsLimit);
1535	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1536	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1537
1538	const float oldRenderCost = penaltyOld * pOverall;
1539	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1540
1541	if (splitPlaneFound)
1542	{
1543	ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
1544	}
1545	//if (axis != 1)
1546	//Debug << "axis=" << axis << " costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
1547	// <<"\t pb=(" << pvsBack << ")\t pf=(" << pvsFront << ")" << endl;
1548
1549	return ratio;
1550	}
1551
1552
1553	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
1554	const VspBspTraversalData &tData,
1555	int &axis,
1556	BspNodeGeometry **frontGeom,
1557	BspNodeGeometry **backGeom,
1558	float &pFront,
1559	float &pBack,
1560	const bool isKdNode)
1561	{
1562	float nPosition[3];
1563	float nCostRatio[3];
1564	float nProbFront[3];
1565	float nProbBack[3];
1566
1567	BspNodeGeometry *nFrontGeom[3];
1568	BspNodeGeometry *nBackGeom[3];
1569
1570	// set to NULL, so I can find out which gemetry was stored
1571	for (int i = 0; i < 3; ++ i)
1572	{
1573	nFrontGeom[i] = NULL;
1574	nBackGeom[i] = NULL;
1575	}
1576
1577	// create bounding box of node geometry
1578	AxisAlignedBox3 box;
1579
1580	//TODO: for kd split geometry already is box => only take minmax vertices
1581	if (1)
1582	{ // get bounding box from geometry
1583	tData.mGeometry->GetBoundingBox(box);
1584	}
1585	else
1586	{
1587	box.Initialize();
1588	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1589
1590	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1591	box.Include((*ri).ExtrapTermination());
1592	}
1593
1594
1595	int sAxis = 0;
1596	int bestAxis;
1597
1598	// if max cost ratio is exceeded, take split along longest axis instead
1599	const float maxCostRatioForArbitraryAxis = 0.9f;
1600
1601	if (mUseDrivingAxisIfMaxCostViolated)
1602	bestAxis = box.Size().DrivingAxis();
1603	else
1604	bestAxis = -1;
1605
1606	#if 0
1607	// maximum cost ratio for axis to be valid:
1608	// if exceeded, spatial mid split is used instead
1609	const maxCostRatioForHeur = 0.99f;
1610	#endif
1611
1612	// if we use some kind of specialised fixed axis
1613	const bool useSpecialAxis =
1614	mOnlyDrivingAxis \|\| mUseRandomAxis \|\| mCirculatingAxis;
1615
1616	if (mUseRandomAxis)
1617	sAxis = Random(3);
1618	else if (mCirculatingAxis)
1619	sAxis = (tData.mAxis + 1) % 3;
1620	else if (mOnlyDrivingAxis)
1621	sAxis = box.Size().DrivingAxis();
1622
1623
1624	//Debug << "use special axis: " << useSpecialAxis << endl;
1625	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
1626
1627	for (axis = 0; axis < 3 ; ++ axis)
1628	{
1629	if (!useSpecialAxis \|\| (axis == sAxis))
1630	{
1631	if (mUseCostHeuristics)
1632	{
1633	//-- place split plane using heuristics
1634	nCostRatio[axis] =
1635	BestCostRatioHeuristics(*tData.mRays,
1636	box,
1637	tData.mPvs,
1638	axis,
1639	nPosition[axis]);
1640	}
1641	else
1642	{
1643	//-- split plane position is spatial median
1644	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1645	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1646
1647	// allows faster split because we have axis aligned kd tree boxes
1648	if (isKdNode)
1649	{
1650	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1651	box,
1652	axis,
1653	nPosition[axis],
1654	nProbFront[axis],
1655	nProbBack[axis]);
1656
1657	// create back geometry from box
1658
1659	// NOTE: the geometry is returned from the function so we
1660	// don't have to recompute it when possible
1661	Vector3 pos;
1662
1663	pos = box.Max(); pos[axis] = nPosition[axis];
1664	AxisAlignedBox3 bBox(box.Min(), pos);
1665
1666	PolygonContainer fPolys;
1667	bBox.ExtractPolys(fPolys);
1668
1669	nBackGeom[axis] = new BspNodeGeometry(fPolys);
1670
1671	////////////
1672	//-- create front geometry from box
1673
1674	pos = box.Min(); pos[axis] = nPosition[axis];
1675	AxisAlignedBox3 fBox(pos, box.Max());
1676
1677	PolygonContainer bPolys;
1678	fBox.ExtractPolys(bPolys);
1679	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
1680	}
1681	else
1682	{
1683	nFrontGeom[axis] = new BspNodeGeometry();
1684	nBackGeom[axis] = new BspNodeGeometry();
1685
1686	nCostRatio[axis] =
1687	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1688	tData, nFrontGeom[axis], nBackGeom[axis],
1689	nProbFront[axis], nProbBack[axis]);
1690	}
1691	}
1692
1693
1694	if (mUseDrivingAxisIfMaxCostViolated)
1695	{
1696	// we take longest axis split if cost ratio exceeds threshold
1697	if (nCostRatio[axis] < min(maxCostRatioForArbitraryAxis, nCostRatio[bestAxis]))
1698	{
1699	bestAxis = axis;
1700	}
1701	/*else if (nCostRatio[axis] < nCostRatio[bestAxis])
1702	{
1703	Debug << "taking split along longest axis (" << bestAxis << ") instead of (" << axis << ")" << endl;
1704	}*/
1705
1706	}
1707	else
1708	{
1709	if (bestAxis == -1)
1710	{
1711	bestAxis = axis;
1712	}
1713	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1714	{
1715	bestAxis = axis;
1716	}
1717	}
1718	}
1719	}
1720
1721	//////////
1722	//-- assign values
1723
1724	axis = bestAxis;
1725	pFront = nProbFront[bestAxis];
1726	pBack = nProbBack[bestAxis];
1727
1728	// assign best split nodes geometry
1729	*frontGeom = nFrontGeom[bestAxis];
1730	*backGeom = nBackGeom[bestAxis];
1731
1732	// and delete other geometry
1733	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1734	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1735
1736	//-- split plane
1737	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1738	plane = Plane3(normal, nPosition[bestAxis]);
1739
1740	//Debug << "best axis: " << bestAxis << " pos " << nPosition[bestAxis] << endl;
1741
1742	return nCostRatio[bestAxis];
1743	}
1744
1745
1746	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
1747	BspLeaf *leaf,
1748	VspBspTraversalData &data,
1749	VspBspTraversalData &frontData,
1750	VspBspTraversalData &backData,
1751	int &splitAxis)
1752	{
1753	// HACK matt: subdivide regularily to certain depth
1754	if (data.mDepth < 0) // question matt: why depth < 0 ?
1755	{
1756	cout << "depth: " << data.mDepth << endl;
1757
1758	// return axis aligned split
1759	AxisAlignedBox3 box;
1760	box.Initialize();
1761
1762	// create bounding box of region
1763	data.mGeometry->GetBoundingBox(box);
1764
1765	const int axis = box.Size().DrivingAxis();
1766	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1767
1768	Vector3 norm(0,0,0); norm[axis] = 1.0f;
1769	bestPlane = Plane3(norm, position);
1770	splitAxis = axis;
1771
1772	return true;
1773	}
1774
1775	// simplest strategy: just take next polygon
1776	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1777	{
1778	if (!data.mPolygons->empty())
1779	{
1780	const int randIdx =
1781	(int)RandomValue(0, (Real)((float)data.mPolygons->size() - 0.5f));
1782	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1783
1784	bestPlane = nextPoly->GetSupportingPlane();
1785	return true;
1786	}
1787	}
1788
1789	//-- use heuristics to find appropriate plane
1790
1791	// intermediate plane
1792	Plane3 plane;
1793	float lowestCost = MAX_FLOAT;
1794
1795	// decides if the first few splits should be only axisAligned
1796	const bool onlyAxisAligned =
1797	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1798	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1799	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1800
1801	const int limit = onlyAxisAligned ? 0 :
1802	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1803
1804	float candidateCost;
1805
1806	int maxIdx = (int)data.mPolygons->size();
1807
1808	for (int i = 0; i < limit; ++ i)
1809	{
1810	// the already taken candidates are stored behind maxIdx
1811	// => assure that no index is taken twice
1812	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1813	Polygon3 poly = (data.mPolygons)[candidateIdx];
1814
1815	// swap candidate to the end to avoid testing same plane
1816	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1817
1818	// evaluate current candidate
1819	BspNodeGeometry fGeom, bGeom;
1820	float fArea, bArea;
1821	plane = poly->GetSupportingPlane();
1822	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1823
1824	if (candidateCost < lowestCost)
1825	{
1826	bestPlane = plane;
1827	lowestCost = candidateCost;
1828	}
1829	}
1830
1831
1832	//-- evaluate axis aligned splits
1833
1834	int axis;
1835	BspNodeGeometry fGeom, bGeom;
1836	float pFront, pBack;
1837
1838	candidateCost = 99999999.0f;
1839
1840	// as a variant, we take axis aligned split only if there is
1841	// more polygon available to guide the split
1842	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
1843	{
1844	candidateCost = SelectAxisAlignedPlane(plane,
1845	data,
1846	axis,
1847	&fGeom,
1848	&bGeom,
1849	pFront,
1850	pBack,
1851	data.mIsKdNode);
1852	}
1853
1854	splitAxis = 3;
1855
1856	if (candidateCost < lowestCost)
1857	{
1858	bestPlane = plane;
1859	lowestCost = candidateCost;
1860	splitAxis = axis;
1861
1862	// assign already computed values
1863	// we can do this because we always save the
1864	// computed values from the axis aligned splits
1865
1866	if (fGeom && bGeom)
1867	{
1868	frontData.mGeometry = fGeom;
1869	backData.mGeometry = bGeom;
1870
1871	frontData.mProbability = pFront;
1872	backData.mProbability = pBack;
1873	}
1874	}
1875	else
1876	{
1877	DEL_PTR(fGeom);
1878	DEL_PTR(bGeom);
1879	}
1880
1881	#ifdef GTP_DEBUG
1882	Debug << "plane lowest cost: " << lowestCost << endl;
1883	#endif
1884
1885	// exeeded relative max cost ratio
1886	if (lowestCost > mTermMaxCostRatio)
1887	{
1888	return false;
1889	}
1890
1891	return true;
1892	}
1893
1894
1895	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1896	{
1897	const int candidateIdx = (int)RandomValue(0, (Real)((float)rays.size() - 0.5f));
1898
1899	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1900	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1901
1902	const Vector3 pt = (maxPt + minPt) * 0.5;
1903	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1904
1905	return Plane3(normal, pt);
1906	}
1907
1908
1909	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1910	{
1911	Vector3 pt[3];
1912
1913	int idx[3];
1914	int cmaxT = 0;
1915	int cminT = 0;
1916	bool chooseMin = false;
1917
1918	for (int j = 0; j < 3; ++ j)
1919	{
1920	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1921
1922	if (idx[j] >= (int)rays.size())
1923	{
1924	idx[j] -= (int)rays.size();
1925
1926	chooseMin = (cminT < 2);
1927	}
1928	else
1929	chooseMin = (cmaxT < 2);
1930
1931	RayInfo rayInf = rays[idx[j]];
1932	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1933	}
1934
1935	return Plane3(pt[0], pt[1], pt[2]);
1936	}
1937
1938
1939	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1940	{
1941	Vector3 pt[3];
1942
1943	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1944	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1945
1946	// check if rays different
1947	if (idx1 == idx2)
1948	idx2 = (idx2 + 1) % (int)rays.size();
1949
1950	const RayInfo ray1 = rays[idx1];
1951	const RayInfo ray2 = rays[idx2];
1952
1953	// normal vector of the plane parallel to both lines
1954	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1955
1956	// vector from line 1 to line 2
1957	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1958
1959	// project vector on normal to get distance
1960	const float dist = DotProd(vd, norm);
1961
1962	// point on plane lies halfway between the two planes
1963	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1964
1965	return Plane3(norm, planePt);
1966	}
1967
1968
1969	inline void VspBspTree::GenerateUniqueIdsForPvs()
1970	{
1971	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1972	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1973	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1974	}
1975
1976
1977	float VspBspTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
1978	const VspBspTraversalData &data,
1979	float &normalizedOldRenderCost) const
1980	{
1981	float pvsFront = 0;
1982	float pvsBack = 0;
1983	float totalPvs = 0;
1984
1985	// probability that view point lies in back / front node
1986	float pOverall = data.mProbability;
1987	float pFront = 0;
1988	float pBack = 0;
1989
1990
1991	// create unique ids for pvs heuristics
1992	GenerateUniqueIdsForPvs();
1993
1994	for (int i = 0; i < data.mRays->size(); ++ i)
1995	{
1996	RayInfo rayInf = (*data.mRays)[i];
1997
1998	float t;
1999	VssRay *ray = rayInf.mRay;
2000	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
2001
2002	// find front and back pvs for origing and termination object
2003	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2004
2005	#if COUNT_ORIGIN_OBJECTS
2006	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2007	#endif
2008	}
2009
2010
2011	BspNodeGeometry geomFront;
2012	BspNodeGeometry geomBack;
2013
2014	// construct child geometry with regard to the candidate split plane
2015	data.mGeometry->SplitGeometry(geomFront,
2016	geomBack,
2017	candidatePlane,
2018	mBoundingBox,
2019	//0.0f);
2020	mEpsilon);
2021
2022	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
2023	{
2024	pFront = geomFront.GetVolume();
2025	pBack = pOverall - pFront;
2026
2027	// something is wrong with the volume
2028	if (0 && ((pFront < 0.0) \|\| (pBack < 0.0)))
2029	{
2030	Debug << "ERROR in volume:\n"
2031	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
2032	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
2033	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
2034	}
2035	}
2036	else
2037	{
2038	pFront = geomFront.GetArea();
2039	pBack = geomBack.GetArea();
2040	}
2041
2042
2043	// -- pvs rendering heuristics
2044
2045	// upper and lower bounds
2046	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
2047	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
2048
2049	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
2050	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
2051	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
2052
2053	const float oldRenderCost = pOverall * penaltyOld;
2054	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2055
2056	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBoundingBox.GetVolume();
2057
2058	// take render cost of node into account to avoid being stuck in a local minimum
2059	normalizedOldRenderCost = oldRenderCost / mBoundingBox.GetVolume();
2060
2061	return renderCostDecrease;
2062	}
2063
2064
2065	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
2066	const VspBspTraversalData &data,
2067	BspNodeGeometry &geomFront,
2068	BspNodeGeometry &geomBack,
2069	float &pFront,
2070	float &pBack) const
2071	{
2072	float totalPvs = 0;
2073	float pvsFront = 0;
2074	float pvsBack = 0;
2075
2076	// overall probability is used as normalizer
2077	float pOverall = 0;
2078
2079	// probability that view point lies in back / front node
2080	pFront = 0;
2081	pBack = 0;
2082
2083	int numTests; // the number of tests
2084
2085	// if random samples shold be taken instead of testing all the rays
2086	bool useRand;
2087
2088	if ((int)data.mRays->size() > mMaxTests)
2089	{
2090	useRand = true;
2091	numTests = mMaxTests;
2092	}
2093	else
2094	{
2095	useRand = false;
2096	numTests = (int)data.mRays->size();
2097	}
2098
2099	// create unique ids for pvs heuristics
2100	GenerateUniqueIdsForPvs();
2101
2102	for (int i = 0; i < numTests; ++ i)
2103	{
2104	const int testIdx = useRand ?
2105	(int)RandomValue(0, (Real)((float)data.mRays->size() - 0.5f)) : i;
2106	RayInfo rayInf = (*data.mRays)[testIdx];
2107
2108	float t;
2109	VssRay *ray = rayInf.mRay;
2110	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
2111
2112	// find front and back pvs for origing and termination object
2113	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2114
2115	#if COUNT_ORIGIN_OBJECTS
2116	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2117	#endif
2118	}
2119
2120	// construct child geometry with regard to the candidate split plane
2121	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
2122	geomBack,
2123	candidatePlane,
2124	mBoundingBox,
2125	//0.0f);
2126	mEpsilon);
2127
2128	pOverall = data.mProbability;
2129
2130	if (!mUseAreaForPvs)
2131	{
2132	pFront = geomFront.GetVolume();
2133	pBack = pOverall - pFront;
2134
2135	// HACK: precision issues possible for unbalanced split => don't take this split!
2136	if (1 &&
2137	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
2138	!geomFront.Valid() \|\| !geomBack.Valid()))
2139	{
2140	//Debug << "error f: " << pFront << " b: " << pBack << endl;
2141
2142	// high penalty for degenerated / wrong split
2143	return 99999.9f;
2144	}
2145	}
2146	else
2147	{
2148	// use front and back cell areas to approximate volume
2149	pFront = geomFront.GetArea();
2150	pBack = geomBack.GetArea();
2151	}
2152
2153	////////
2154	//-- pvs rendering heuristics
2155
2156	const float lowerPvsLimit = (float)mViewCellsManager->GetMinPvsSize();
2157	const float upperPvsLimit = (float)mViewCellsManager->GetMaxPvsSize();
2158
2159	// only render cost heuristics or combined with standard deviation
2160	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
2161	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
2162	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
2163
2164	const float oldRenderCost = pOverall * penaltyOld;
2165	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2166
2167	float oldCost, newCost;
2168
2169	// only render cost
2170	if (1)
2171	{
2172	oldCost = oldRenderCost;
2173	newCost = newRenderCost;
2174	}
2175	else // also considering standard deviation
2176	{
2177	// standard deviation is difference of back and front pvs
2178	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
2179
2180	const float newDeviation = 0.5f *
2181	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
2182
2183	const float oldDeviation = penaltyOld;
2184
2185	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
2186	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
2187	}
2188
2189	const float cost = mPvsFactor * newCost / (oldCost + Limits::Small);
2190
2191
2192	#ifdef GTP_DEBUG
2193	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
2194	<< " frontpvs: " << pvsFront << " pFront: " << pFront
2195	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
2196	Debug << "cost: " << cost << endl;
2197	#endif
2198
2199	return cost;
2200	}
2201
2202
2203	int VspBspTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
2204	ViewCellContainer &viewCells) const
2205	{
2206	stack<bspNodePair> nodeStack;
2207	BspNodeGeometry *rgeom = new BspNodeGeometry();
2208
2209	ConstructGeometry(mRoot, *rgeom);
2210
2211	nodeStack.push(bspNodePair(mRoot, rgeom));
2212
2213	ViewCell::NewMail();
2214
2215	while (!nodeStack.empty())
2216	{
2217	BspNode *node = nodeStack.top().first;
2218	BspNodeGeometry *geom = nodeStack.top().second;
2219	nodeStack.pop();
2220
2221	const int side = geom->ComputeIntersection(box);
2222
2223	switch (side)
2224	{
2225	case -1:
2226	// node geometry is contained in box
2227	CollectViewCells(node, true, viewCells, true);
2228	break;
2229
2230	case 0:
2231	if (node->IsLeaf())
2232	{
2233	BspLeaf leaf = static_cast<BspLeaf >(node);
2234
2235	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2236	{
2237	leaf->GetViewCell()->Mail();
2238	viewCells.push_back(leaf->GetViewCell());
2239	}
2240	}
2241	else
2242	{
2243	BspInterior interior = static_cast<BspInterior >(node);
2244
2245	BspNode *first = interior->GetFront();
2246	BspNode *second = interior->GetBack();
2247
2248	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2249	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2250
2251	geom->SplitGeometry(*firstGeom,
2252	*secondGeom,
2253	interior->GetPlane(),
2254	mBoundingBox,
2255	//0.0000001f);
2256	mEpsilon);
2257
2258	nodeStack.push(bspNodePair(first, firstGeom));
2259	nodeStack.push(bspNodePair(second, secondGeom));
2260	}
2261
2262	break;
2263	default:
2264	// default: cull
2265	break;
2266	}
2267
2268	DEL_PTR(geom);
2269
2270	}
2271
2272	return (int)viewCells.size();
2273	}
2274
2275
2276	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
2277	const AxisAlignedBox3 &box,
2278	const int axis,
2279	const float &position,
2280	float &pFront,
2281	float &pBack) const
2282	{
2283	float pvsTotal = 0;
2284	float pvsFront = 0;
2285	float pvsBack = 0;
2286
2287	// create unique ids for pvs heuristics
2288	GenerateUniqueIdsForPvs();
2289
2290	const int pvsSize = data.mPvs;
2291
2292	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
2293
2294	// this is the main ray classification loop!
2295	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
2296	{
2297	// determine the side of this ray with respect to the plane
2298	float t;
2299	const int side = (*rit).ComputeRayIntersection(axis, position, t);
2300
2301	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
2302
2303	#if COUNT_ORIGIN_OBJECTS
2304	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
2305	#endif
2306	}
2307
2308
2309	//-- pvs heuristics
2310
2311	float pOverall = data.mProbability;
2312
2313	// note: we use a simplified computation assuming that we always do a
2314	// spatial mid split
2315
2316	if (!mUseAreaForPvs)
2317	{
2318	// volume
2319	pBack = pFront = pOverall * 0.5f;
2320	#if 0
2321	// box length substitute for probability
2322	const float minBox = box.Min(axis);
2323	const float maxBox = box.Max(axis);
2324
2325	pBack = position - minBox;
2326	pFront = maxBox - position;
2327	pOverall = maxBox - minBox;
2328	#endif
2329	}
2330	else //-- area substitute for probability
2331	{
2332	const int axis2 = (axis + 1) % 3;
2333	const int axis3 = (axis + 2) % 3;
2334
2335	const float faceArea =
2336	(box.Max(axis2) - box.Min(axis2)) *
2337	(box.Max(axis3) - box.Min(axis3));
2338
2339	pBack = pFront = pOverall * 0.5f + faceArea;
2340	}
2341
2342	#ifdef GTP_DEBUG
2343	Debug << "axis: " << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
2344	Debug << "p: " << pFront << " " << pBack << " " << pOverall << endl;
2345	#endif
2346
2347
2348	const float newCost = pvsBack * pBack + pvsFront * pFront;
2349	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
2350
2351	return (mCtDivCi + newCost) / oldCost;
2352	}
2353
2354
2355	inline void VspBspTree::AddObjToPvs(Intersectable *obj,
2356	const int cf,
2357	float &frontPvs,
2358	float &backPvs,
2359	float &totalPvs) const
2360	{
2361	if (!obj)
2362	return;
2363	#if 0
2364	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
2365	#else
2366	const int renderCost = 1;
2367	#endif
2368	// new object
2369	if ((obj->mMailbox != sFrontId) &&
2370	(obj->mMailbox != sBackId) &&
2371	(obj->mMailbox != sFrontAndBackId))
2372	{
2373	totalPvs += renderCost;
2374	}
2375
2376	// TODO: does this really belong to no pvs?
2377	//if (cf == Ray::COINCIDENT) return;
2378
2379	// object belongs to both PVS
2380	if (cf >= 0)
2381	{
2382	if ((obj->mMailbox != sFrontId) &&
2383	(obj->mMailbox != sFrontAndBackId))
2384	{
2385	frontPvs += renderCost;
2386
2387	if (obj->mMailbox == sBackId)
2388	obj->mMailbox = sFrontAndBackId;
2389	else
2390	obj->mMailbox = sFrontId;
2391	}
2392	}
2393
2394	if (cf <= 0)
2395	{
2396	if ((obj->mMailbox != sBackId) &&
2397	(obj->mMailbox != sFrontAndBackId))
2398	{
2399	backPvs += renderCost;
2400
2401	if (obj->mMailbox == sFrontId)
2402	obj->mMailbox = sFrontAndBackId;
2403	else
2404	obj->mMailbox = sBackId;
2405	}
2406	}
2407	}
2408
2409
2410	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
2411	const bool onlyUnmailed,
2412	const int maxPvsSize) const
2413	{
2414	stack<BspNode *> nodeStack;
2415	nodeStack.push(mRoot);
2416
2417	while (!nodeStack.empty())
2418	{
2419	BspNode *node = nodeStack.top();
2420	nodeStack.pop();
2421
2422	if (node->IsLeaf())
2423	{
2424	// test if this leaf is in valid view space
2425	BspLeaf leaf = static_cast<BspLeaf >(node);
2426	if (leaf->TreeValid() &&
2427	(!onlyUnmailed \|\| !leaf->Mailed()) &&
2428	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().EvalPvsCost() <= maxPvsSize)))
2429	{
2430	leaves.push_back(leaf);
2431	}
2432	}
2433	else
2434	{
2435	BspInterior interior = static_cast<BspInterior >(node);
2436
2437	nodeStack.push(interior->GetBack());
2438	nodeStack.push(interior->GetFront());
2439	}
2440	}
2441	}
2442
2443
2444	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
2445	{
2446	return mBoundingBox;
2447	}
2448
2449
2450	BspNode *VspBspTree::GetRoot() const
2451	{
2452	return mRoot;
2453	}
2454
2455
2456	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
2457	{
2458	// the node became a leaf -> evaluate stats for leafs
2459	BspLeaf leaf = static_cast<BspLeaf >(data.mNode);
2460
2461
2462	if (data.mPvs > mBspStats.maxPvs)
2463	{
2464	mBspStats.maxPvs = data.mPvs;
2465	}
2466
2467	mBspStats.pvs += data.mPvs;
2468
2469	if (data.mDepth < mBspStats.minDepth)
2470	{
2471	mBspStats.minDepth = data.mDepth;
2472	}
2473
2474	if (data.mDepth >= mTermMaxDepth)
2475	{
2476	++ mBspStats.maxDepthNodes;
2477	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
2478	}
2479
2480	// accumulate rays to compute rays / leaf
2481	mBspStats.accumRays += (int)data.mRays->size();
2482
2483	if (data.mPvs < mTermMinPvs)
2484	++ mBspStats.minPvsNodes;
2485
2486	if ((int)data.mRays->size() < mTermMinRays)
2487	++ mBspStats.minRaysNodes;
2488
2489	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
2490	++ mBspStats.maxRayContribNodes;
2491
2492	if (data.mProbability <= mTermMinProbability)
2493	++ mBspStats.minProbabilityNodes;
2494
2495	// accumulate depth to compute average depth
2496	mBspStats.accumDepth += data.mDepth;
2497
2498	++ mCreatedViewCells;
2499
2500	#ifdef GTP_DEBUG
2501	Debug << "BSP stats: "
2502	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
2503	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
2504	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
2505	<< "#pvs: " << leaf->GetViewCell()->GetPvs().EvalPvsCost() << "), "
2506	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
2507	#endif
2508	}
2509
2510
2511	int VspBspTree::CastRay(Ray &ray)
2512	{
2513	int hits = 0;
2514
2515	stack<BspRayTraversalData> tQueue;
2516
2517	float maxt, mint;
2518
2519	if (!mBoundingBox.GetRaySegment(ray, mint, maxt))
2520	return 0;
2521
2522	Intersectable::NewMail();
2523	ViewCell::NewMail();
2524
2525	Vector3 entp = ray.Extrap(mint);
2526	Vector3 extp = ray.Extrap(maxt);
2527
2528	BspNode *node = mRoot;
2529	BspNode *farChild = NULL;
2530
2531	while (1)
2532	{
2533	if (!node->IsLeaf())
2534	{
2535	BspInterior in = static_cast<BspInterior >(node);
2536
2537	Plane3 splitPlane = in->GetPlane();
2538	const int entSide = splitPlane.Side(entp);
2539	const int extSide = splitPlane.Side(extp);
2540
2541	if (entSide < 0)
2542	{
2543	node = in->GetBack();
2544
2545	if(extSide <= 0) // plane does not split ray => no far child
2546	continue;
2547
2548	farChild = in->GetFront(); // plane splits ray
2549
2550	} else if (entSide > 0)
2551	{
2552	node = in->GetFront();
2553
2554	if (extSide >= 0) // plane does not split ray => no far child
2555	continue;
2556
2557	farChild = in->GetBack(); // plane splits ray
2558	}
2559	else // ray and plane are coincident
2560	{
2561	// matt: WHAT TO DO IN THIS CASE ?
2562	//break;
2563	node = in->GetFront();
2564	continue;
2565	}
2566
2567	// push data for far child
2568	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
2569
2570	// find intersection of ray segment with plane
2571	float t;
2572	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
2573	maxt *= t;
2574	}
2575	else // reached leaf => intersection with view cell
2576	{
2577	BspLeaf leaf = static_cast<BspLeaf >(node);
2578
2579	if (!leaf->GetViewCell()->Mailed())
2580	{
2581	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
2582	leaf->GetViewCell()->Mail();
2583	++ hits;
2584	}
2585
2586	//-- fetch the next far child from the stack
2587	if (tQueue.empty())
2588	break;
2589
2590	entp = extp;
2591	mint = maxt; // NOTE: need this?
2592
2593	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
2594	break;
2595
2596	BspRayTraversalData &s = tQueue.top();
2597
2598	node = s.mNode;
2599	extp = s.mExitPoint;
2600	maxt = s.mMaxT;
2601
2602	tQueue.pop();
2603	}
2604	}
2605
2606	return hits;
2607	}
2608
2609
2610	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells,
2611	bool onlyValid) const
2612	{
2613	ViewCell::NewMail();
2614	CollectViewCells(mRoot, onlyValid, viewCells, true);
2615	}
2616
2617
2618	void VspBspTree::CollectViewCells(BspNode *root,
2619	bool onlyValid,
2620	ViewCellContainer &viewCells,
2621	bool onlyUnmailed) const
2622	{
2623	stack<BspNode *> nodeStack;
2624
2625	if (!root)
2626	return;
2627
2628	nodeStack.push(root);
2629
2630	while (!nodeStack.empty())
2631	{
2632	BspNode *node = nodeStack.top();
2633	nodeStack.pop();
2634
2635	if (node->IsLeaf())
2636	{
2637	if (!onlyValid \|\| node->TreeValid())
2638	{
2639	ViewCellLeaf leafVc = static_cast<BspLeaf >(node)->GetViewCell();
2640
2641	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
2642
2643	if (!onlyUnmailed \|\| !viewCell->Mailed())
2644	{
2645	viewCell->Mail();
2646	viewCells.push_back(viewCell);
2647	}
2648	}
2649	}
2650	else
2651	{
2652	BspInterior interior = static_cast<BspInterior >(node);
2653
2654	nodeStack.push(interior->GetFront());
2655	nodeStack.push(interior->GetBack());
2656	}
2657	}
2658	}
2659
2660
2661	void VspBspTree::CollapseViewCells()
2662	{
2663	// TODO
2664	#if HAS_TO_BE_REDONE
2665	stack<BspNode *> nodeStack;
2666
2667	if (!mRoot)
2668	return;
2669
2670	nodeStack.push(mRoot);
2671
2672	while (!nodeStack.empty())
2673	{
2674	BspNode *node = nodeStack.top();
2675	nodeStack.pop();
2676
2677	if (node->IsLeaf())
2678	{
2679	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
2680
2681	if (!viewCell->GetValid())
2682	{
2683	BspViewCell viewCell = static_cast<BspLeaf >(node)->GetViewCell();
2684
2685	ViewCellContainer leaves;
2686	mViewCellsTree->CollectLeaves(viewCell, leaves);
2687
2688	ViewCellContainer::const_iterator it, it_end = leaves.end();
2689
2690	for (it = leaves.begin(); it != it_end; ++ it)
2691	{
2692	BspLeaf l = static_cast<BspViewCell >(*it)->mLeaf;
2693	l->SetViewCell(GetOrCreateOutOfBoundsCell());
2694	++ mBspStats.invalidLeaves;
2695	}
2696
2697	// add to unbounded view cell
2698	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
2699	DEL_PTR(viewCell);
2700	}
2701	}
2702	else
2703	{
2704	BspInterior interior = static_cast<BspInterior >(node);
2705
2706	nodeStack.push(interior->GetFront());
2707	nodeStack.push(interior->GetBack());
2708	}
2709	}
2710
2711	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2712	#endif
2713	}
2714
2715
2716	void VspBspTree::CollectRays(VssRayContainer &rays)
2717	{
2718	vector<BspLeaf *> leaves;
2719
2720	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
2721
2722	for (lit = leaves.begin(); lit != lit_end; ++ lit)
2723	{
2724	BspLeaf leaf = lit;
2725	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
2726
2727	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
2728	rays.push_back(*rit);
2729	}
2730	}
2731
2732
2733	void VspBspTree::ValidateTree()
2734	{
2735	stack<BspNode *> nodeStack;
2736
2737	if (!mRoot)
2738	return;
2739
2740	nodeStack.push(mRoot);
2741
2742	mBspStats.invalidLeaves = 0;
2743	while (!nodeStack.empty())
2744	{
2745	BspNode *node = nodeStack.top();
2746	nodeStack.pop();
2747
2748	if (node->IsLeaf())
2749	{
2750	BspLeaf leaf = static_cast<BspLeaf >(node);
2751
2752	if (!leaf->GetViewCell()->GetValid())
2753	++ mBspStats.invalidLeaves;
2754
2755	// validity flags don't match => repair
2756	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
2757	{
2758	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
2759	PropagateUpValidity(leaf);
2760	}
2761	}
2762	else
2763	{
2764	BspInterior interior = static_cast<BspInterior >(node);
2765
2766	nodeStack.push(interior->GetFront());
2767	nodeStack.push(interior->GetBack());
2768	}
2769	}
2770
2771	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2772	}
2773
2774
2775	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
2776	{
2777	// preprocess: throw out polygons coincident to the view space box (not needed)
2778	PolygonContainer boxPolys;
2779
2780	mBoundingBox.ExtractPolys(boxPolys);
2781	vector<Plane3> boxPlanes;
2782
2783	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2784
2785	// extract planes of box
2786	// TODO: can be done more elegantly than first extracting polygons
2787	// and take their planes
2788	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2789	{
2790	boxPlanes.push_back((*pit)->GetSupportingPlane());
2791	}
2792
2793	pit_end = polys.end();
2794
2795	for (pit = polys.begin(); pit != pit_end; ++ pit)
2796	{
2797	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2798
2799	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2800	{
2801	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2802
2803	if (cf == Polygon3::COINCIDENT)
2804	{
2805	DEL_PTR(*pit);
2806	//Debug << "coincident!!" << endl;
2807	}
2808	}
2809	}
2810
2811	// remove deleted entries after swapping them to end of vector
2812	for (int i = 0; i < (int)polys.size(); ++ i)
2813	{
2814	while (!polys[i] && (i < (int)polys.size()))
2815	{
2816	swap(polys[i], polys.back());
2817	polys.pop_back();
2818	}
2819	}
2820	}
2821
2822
2823	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2824	{
2825	float len = 0;
2826
2827	RayInfoContainer::const_iterator it, it_end = rays.end();
2828
2829	for (it = rays.begin(); it != it_end; ++ it)
2830	len += (*it).SegmentLength();
2831
2832	return len;
2833	}
2834
2835
2836	int VspBspTree::SplitRays(const Plane3 &plane,
2837	RayInfoContainer &rays,
2838	RayInfoContainer &frontRays,
2839	RayInfoContainer &backRays) const
2840	{
2841	int splits = 0;
2842
2843	RayInfoContainer::const_iterator it, it_end = rays.end();
2844
2845	for (it = rays.begin(); it != it_end; ++ it)
2846	{
2847	RayInfo bRay = *it;
2848
2849	VssRay *ray = bRay.mRay;
2850	float t;
2851
2852	// get classification and receive new t
2853	const int cf = bRay.ComputeRayIntersection(plane, t);
2854
2855	switch (cf)
2856	{
2857	case -1:
2858	backRays.push_back(bRay);
2859	break;
2860	case 1:
2861	frontRays.push_back(bRay);
2862	break;
2863	case 0:
2864	{
2865	//-- split ray
2866	// test if start point behind or in front of plane
2867	const int side = plane.Side(bRay.ExtrapOrigin());
2868
2869	++ splits;
2870
2871	if (side <= 0)
2872	{
2873	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2874	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2875	}
2876	else
2877	{
2878	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2879	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2880	}
2881	}
2882	break;
2883	default:
2884	Debug << "Should not come here" << endl;
2885	break;
2886	}
2887	}
2888
2889	return splits;
2890	}
2891
2892
2893	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2894	{
2895	BspNode *lastNode;
2896
2897	do
2898	{
2899	lastNode = n;
2900
2901	// want to get planes defining geometry of this node => don't take
2902	// split plane of node itself
2903	n = n->GetParent();
2904
2905	if (n)
2906	{
2907	BspInterior interior = static_cast<BspInterior >(n);
2908	Plane3 halfSpace = static_cast<BspInterior *>(interior)->GetPlane();
2909
2910	if (interior->GetBack() != lastNode)
2911	halfSpace.ReverseOrientation();
2912
2913	halfSpaces.push_back(halfSpace);
2914	}
2915	}
2916	while (n);
2917	}
2918
2919
2920	void VspBspTree::ConstructGeometry(BspNode *n,
2921	BspNodeGeometry &geom) const
2922	{
2923	vector<Plane3> halfSpaces;
2924	ExtractHalfSpaces(n, halfSpaces);
2925
2926	PolygonContainer candidatePolys;
2927	vector<Plane3> candidatePlanes;
2928
2929	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
2930
2931	// bounded planes are added to the polygons
2932	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
2933	{
2934	Polygon3 p = GetBoundingBox().CrossSection(pit);
2935
2936	if (p->Valid(mEpsilon))
2937	{
2938	candidatePolys.push_back(p);
2939	candidatePlanes.push_back(*pit);
2940	}
2941	}
2942
2943	// add faces of bounding box (also could be faces of the cell)
2944	for (int i = 0; i < 6; ++ i)
2945	{
2946	VertexContainer vertices;
2947
2948	for (int j = 0; j < 4; ++ j)
2949	{
2950	vertices.push_back(mBoundingBox.GetFace(i).mVertices[j]);
2951	}
2952
2953	Polygon3 *poly = new Polygon3(vertices);
2954
2955	candidatePolys.push_back(poly);
2956	candidatePlanes.push_back(poly->GetSupportingPlane());
2957	}
2958
2959	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2960	{
2961	// polygon is split by all other planes
2962	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2963	{
2964	if (i == j) // polygon and plane are coincident
2965	continue;
2966
2967	VertexContainer splitPts;
2968	Polygon3 frontPoly, backPoly;
2969
2970	const int cf =
2971	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2972	mEpsilon);
2973
2974	switch (cf)
2975	{
2976	case Polygon3::SPLIT:
2977	frontPoly = new Polygon3();
2978	backPoly = new Polygon3();
2979
2980	candidatePolys[i]->Split(halfSpaces[j],
2981	*frontPoly,
2982	*backPoly,
2983	mEpsilon);
2984
2985	DEL_PTR(candidatePolys[i]);
2986
2987	if (backPoly->Valid(mEpsilon))
2988	{
2989	candidatePolys[i] = backPoly;
2990	}
2991	else
2992	{
2993	DEL_PTR(backPoly);
2994	}
2995
2996	// outside, don't need this
2997	DEL_PTR(frontPoly);
2998	break;
2999
3000	// polygon outside of halfspace
3001	case Polygon3::FRONT_SIDE:
3002	DEL_PTR(candidatePolys[i]);
3003	break;
3004
3005	// just take polygon as it is
3006	case Polygon3::BACK_SIDE:
3007	case Polygon3::COINCIDENT:
3008	default:
3009	break;
3010	}
3011	}
3012
3013	if (candidatePolys[i])
3014	{
3015	geom.Add(candidatePolys[i], candidatePlanes[i]);
3016	}
3017	}
3018	}
3019
3020
3021	bool VspBspTree::IsOutOfBounds(ViewCell *vc) const
3022	{
3023	return vc->GetId() == OUT_OF_BOUNDS_ID;
3024	}
3025
3026
3027	void VspBspTree::SetViewCellsTree(ViewCellsTree *viewCellsTree)
3028	{
3029	mViewCellsTree = viewCellsTree;
3030	}
3031
3032
3033	void VspBspTree::ConstructGeometry(ViewCell *vc,
3034	BspNodeGeometry &vcGeom) const
3035	{
3036	// if false, cannot construct geometry for interior leaf
3037	if (!mViewCellsTree)
3038	return;
3039
3040	ViewCellContainer leaves;
3041	mViewCellsTree->CollectLeaves(vc, leaves);
3042
3043	ViewCellContainer::const_iterator it, it_end = leaves.end();
3044
3045	for (it = leaves.begin(); it != it_end; ++ it)
3046	{
3047	if (IsOutOfBounds(*it))
3048	continue;
3049
3050	BspViewCell bspVc = static_cast<BspViewCell >(*it);
3051	vector<BspLeaf *>::const_iterator bit, bit_end = bspVc->mLeaves.end();
3052
3053	for (bit = bspVc->mLeaves.begin(); bit != bit_end; ++ bit)
3054	{
3055	BspLeaf l = bit;
3056	ConstructGeometry(l, vcGeom);
3057	}
3058	}
3059	}
3060
3061
3062	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
3063	const bool onlyUnmailed) const
3064	{
3065	stack<bspNodePair> nodeStack;
3066
3067	BspNodeGeometry nodeGeom;
3068	ConstructGeometry(n, nodeGeom);
3069	// const float eps = 0.5f;
3070	const float eps = 0.01f;
3071	// split planes from the root to this node
3072	// needed to verify that we found neighbor leaf
3073	// TODO: really needed?
3074	vector<Plane3> halfSpaces;
3075	ExtractHalfSpaces(n, halfSpaces);
3076
3077
3078	BspNodeGeometry *rgeom = new BspNodeGeometry();
3079	ConstructGeometry(mRoot, *rgeom);
3080
3081	nodeStack.push(bspNodePair(mRoot, rgeom));
3082
3083	while (!nodeStack.empty())
3084	{
3085	BspNode *node = nodeStack.top().first;
3086	BspNodeGeometry *geom = nodeStack.top().second;
3087
3088	nodeStack.pop();
3089
3090	if (node->IsLeaf())
3091	{
3092	// test if this leaf is in valid view space
3093	if (node->TreeValid() &&
3094	(node != n) &&
3095	(!onlyUnmailed \|\| !node->Mailed()))
3096	{
3097	bool isAdjacent = true;
3098
3099	if (1)
3100	{
3101	// test all planes of current node if still adjacent
3102	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
3103	{
3104	const int cf =
3105	Polygon3::ClassifyPlane(geom->GetPolys(),
3106	halfSpaces[i],
3107	eps);
3108
3109	if (cf == Polygon3::FRONT_SIDE)
3110	{
3111	isAdjacent = false;
3112	}
3113	}
3114	}
3115	else
3116	{
3117	// TODO: why is this wrong??
3118	// test all planes of current node if still adjacent
3119	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
3120	{
3121	Polygon3 *poly = nodeGeom.GetPolys()[i];
3122
3123	const int cf =
3124	Polygon3::ClassifyPlane(geom->GetPolys(),
3125	poly->GetSupportingPlane(),
3126	eps);
3127
3128	if (cf == Polygon3::FRONT_SIDE)
3129	{
3130	isAdjacent = false;
3131	}
3132	}
3133	}
3134	// neighbor was found
3135	if (isAdjacent)
3136	{
3137	neighbors.push_back(static_cast<BspLeaf *>(node));
3138	}
3139	}
3140	}
3141	else
3142	{
3143	BspInterior interior = static_cast<BspInterior >(node);
3144
3145	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3146	interior->GetPlane(),
3147	eps);
3148
3149	BspNode *front = interior->GetFront();
3150	BspNode *back = interior->GetBack();
3151
3152	BspNodeGeometry *fGeom = new BspNodeGeometry();
3153	BspNodeGeometry *bGeom = new BspNodeGeometry();
3154
3155	geom->SplitGeometry(*fGeom,
3156	*bGeom,
3157	interior->GetPlane(),
3158	mBoundingBox,
3159	//0.0000001f);
3160	eps);
3161
3162	if (cf == Polygon3::BACK_SIDE)
3163	{
3164	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3165	DEL_PTR(fGeom);
3166	}
3167	else
3168	{
3169	if (cf == Polygon3::FRONT_SIDE)
3170	{
3171	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3172	DEL_PTR(bGeom);
3173	}
3174	else
3175	{ // random decision
3176	nodeStack.push(bspNodePair(front, fGeom));
3177	nodeStack.push(bspNodePair(back, bGeom));
3178	}
3179	}
3180	}
3181
3182	DEL_PTR(geom);
3183	}
3184
3185	return (int)neighbors.size();
3186	}
3187
3188
3189
3190	int VspBspTree::FindApproximateNeighbors(BspNode *n,
3191	vector<BspLeaf *> &neighbors,
3192	const bool onlyUnmailed) const
3193	{
3194	stack<bspNodePair> nodeStack;
3195
3196	BspNodeGeometry nodeGeom;
3197	ConstructGeometry(n, nodeGeom);
3198
3199	float eps = 0.01f;
3200	// split planes from the root to this node
3201	// needed to verify that we found neighbor leaf
3202	// TODO: really needed?
3203	vector<Plane3> halfSpaces;
3204	ExtractHalfSpaces(n, halfSpaces);
3205
3206
3207	BspNodeGeometry *rgeom = new BspNodeGeometry();
3208	ConstructGeometry(mRoot, *rgeom);
3209
3210	nodeStack.push(bspNodePair(mRoot, rgeom));
3211
3212	while (!nodeStack.empty())
3213	{
3214	BspNode *node = nodeStack.top().first;
3215	BspNodeGeometry *geom = nodeStack.top().second;
3216
3217	nodeStack.pop();
3218
3219	if (node->IsLeaf())
3220	{
3221	// test if this leaf is in valid view space
3222	if (node->TreeValid() &&
3223	(node != n) &&
3224	(!onlyUnmailed \|\| !node->Mailed()))
3225	{
3226	bool isAdjacent = true;
3227
3228	// neighbor was found
3229	if (isAdjacent)
3230	{
3231	neighbors.push_back(static_cast<BspLeaf *>(node));
3232	}
3233	}
3234	}
3235	else
3236	{
3237	BspInterior interior = static_cast<BspInterior >(node);
3238
3239	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3240	interior->GetPlane(),
3241	eps);
3242
3243	BspNode *front = interior->GetFront();
3244	BspNode *back = interior->GetBack();
3245
3246	BspNodeGeometry *fGeom = new BspNodeGeometry();
3247	BspNodeGeometry *bGeom = new BspNodeGeometry();
3248
3249	geom->SplitGeometry(*fGeom,
3250	*bGeom,
3251	interior->GetPlane(),
3252	mBoundingBox,
3253	//0.0000001f);
3254	eps);
3255
3256	if (cf == Polygon3::BACK_SIDE)
3257	{
3258	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3259	DEL_PTR(fGeom);
3260	}
3261	else
3262	{
3263	if (cf == Polygon3::FRONT_SIDE)
3264	{
3265	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3266	DEL_PTR(bGeom);
3267	}
3268	else
3269	{ // random decision
3270	nodeStack.push(bspNodePair(front, fGeom));
3271	nodeStack.push(bspNodePair(back, bGeom));
3272	}
3273	}
3274	}
3275
3276	DEL_PTR(geom);
3277	}
3278
3279	return (int)neighbors.size();
3280	}
3281
3282
3283
3284	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
3285	{
3286	stack<BspNode *> nodeStack;
3287	nodeStack.push(mRoot);
3288
3289	int mask = rand();
3290
3291	while (!nodeStack.empty())
3292	{
3293	BspNode *node = nodeStack.top();
3294	nodeStack.pop();
3295
3296	if (node->IsLeaf())
3297	{
3298	return static_cast<BspLeaf *>(node);
3299	}
3300	else
3301	{
3302	BspInterior interior = static_cast<BspInterior >(node);
3303	BspNode *next;
3304	BspNodeGeometry geom;
3305
3306	// todo: not very efficient: constructs full cell everytime
3307	ConstructGeometry(interior, geom);
3308
3309	const int cf =
3310	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
3311
3312	if (cf == Polygon3::BACK_SIDE)
3313	next = interior->GetFront();
3314	else
3315	if (cf == Polygon3::FRONT_SIDE)
3316	next = interior->GetFront();
3317	else
3318	{
3319	// random decision
3320	if (mask & 1)
3321	next = interior->GetBack();
3322	else
3323	next = interior->GetFront();
3324	mask = mask >> 1;
3325	}
3326
3327	nodeStack.push(next);
3328	}
3329	}
3330
3331	return NULL;
3332	}
3333
3334
3335	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
3336	{
3337	stack<BspNode *> nodeStack;
3338
3339	nodeStack.push(mRoot);
3340
3341	int mask = rand();
3342
3343	while (!nodeStack.empty())
3344	{
3345	BspNode *node = nodeStack.top();
3346	nodeStack.pop();
3347
3348	if (node->IsLeaf())
3349	{
3350	if ( (!onlyUnmailed \|\| !node->Mailed()) )
3351	return static_cast<BspLeaf *>(node);
3352	}
3353	else
3354	{
3355	BspInterior interior = static_cast<BspInterior >(node);
3356
3357	// random decision
3358	if (mask & 1)
3359	nodeStack.push(interior->GetBack());
3360	else
3361	nodeStack.push(interior->GetFront());
3362
3363	mask = mask >> 1;
3364	}
3365	}
3366
3367	return NULL;
3368	}
3369
3370
3371	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
3372	{
3373	int pvsSize = 0;
3374
3375	RayInfoContainer::const_iterator rit, rit_end = rays.end();
3376
3377	Intersectable::NewMail();
3378
3379	for (rit = rays.begin(); rit != rays.end(); ++ rit)
3380	{
3381	VssRay ray = (rit).mRay;
3382
3383	#if COUNT_ORIGIN_OBJECTS
3384	if (ray->mOriginObject)
3385	{
3386	if (!ray->mOriginObject->Mailed())
3387	{
3388	ray->mOriginObject->Mail();
3389	++ pvsSize;
3390	}
3391	}
3392	#endif
3393	if (ray->mTerminationObject)
3394	{
3395	if (!ray->mTerminationObject->Mailed())
3396	{
3397	ray->mTerminationObject->Mail();
3398	++ pvsSize;
3399	}
3400	}
3401	}
3402
3403	return pvsSize;
3404	}
3405
3406
3407	float VspBspTree::GetEpsilon() const
3408	{
3409	return mEpsilon;
3410	}
3411
3412
3413	int VspBspTree::SplitPolygons(const Plane3 &plane,
3414	PolygonContainer &polys,
3415	PolygonContainer &frontPolys,
3416	PolygonContainer &backPolys,
3417	PolygonContainer &coincident) const
3418	{
3419	int splits = 0;
3420
3421	PolygonContainer::const_iterator it, it_end = polys.end();
3422
3423	for (it = polys.begin(); it != polys.end(); ++ it)
3424	{
3425	Polygon3 poly = it;
3426
3427	// classify polygon
3428	const int cf = poly->ClassifyPlane(plane, mEpsilon);
3429
3430	switch (cf)
3431	{
3432	case Polygon3::COINCIDENT:
3433	coincident.push_back(poly);
3434	break;
3435	case Polygon3::FRONT_SIDE:
3436	frontPolys.push_back(poly);
3437	break;
3438	case Polygon3::BACK_SIDE:
3439	backPolys.push_back(poly);
3440	break;
3441	case Polygon3::SPLIT:
3442	backPolys.push_back(poly);
3443	frontPolys.push_back(poly);
3444	++ splits;
3445	break;
3446	default:
3447	Debug << "SHOULD NEVER COME HERE\n";
3448	break;
3449	}
3450	}
3451
3452	return splits;
3453	}
3454
3455
3456	int VspBspTree::CastLineSegment(const Vector3 &origin,
3457	const Vector3 &termination,
3458	ViewCellContainer &viewcells)
3459	{
3460	int hits = 0;
3461	stack<BspRayTraversalData> tStack;
3462
3463	float mint = 0.0f, maxt = 1.0f;
3464
3465	// ViewCell::NewMail();
3466
3467	Vector3 entp = origin;
3468	Vector3 extp = termination;
3469
3470	BspNode *node = mRoot;
3471	BspNode *farChild = NULL;
3472
3473	float t;
3474	const float thresh = 1e-6f; // matt: change this to adjustable value
3475
3476	while (1)
3477	{
3478	if (!node->IsLeaf())
3479	{
3480	BspInterior in = static_cast<BspInterior >(node);
3481
3482	Plane3 *splitPlane = &(in->GetPlane());
3483
3484	const int entSide = splitPlane->Side(entp, thresh);
3485	const int extSide = splitPlane->Side(extp, thresh);
3486
3487	if (entSide < 0)
3488	{
3489	node = in->GetBack();
3490
3491	// plane does not split ray => no far child
3492	if (extSide <= 0)
3493	continue;
3494
3495	farChild = in->GetFront(); // plane splits ray
3496	}
3497	else if (entSide > 0)
3498	{
3499	node = in->GetFront();
3500
3501	if (extSide >= 0) // plane does not split ray => no far child
3502	continue;
3503
3504	farChild = in->GetBack(); // plane splits ray
3505	}
3506	else // one of the ray end points is on the plane
3507	{
3508	// NOTE: what to do if ray is coincident with plane?
3509	if (extSide < 0)
3510	node = in->GetBack();
3511	else //if (extSide > 0)
3512	node = in->GetFront();
3513	//else break; // coincident => count no intersections
3514
3515	continue; // no far child
3516	}
3517
3518	// push data for far child
3519	tStack.push(BspRayTraversalData(farChild, extp));
3520
3521	// find intersection of ray segment with plane
3522	extp = splitPlane->FindIntersection(origin, extp, &t);
3523	}
3524	else
3525	{
3526	// reached leaf => intersection with view cell
3527	BspLeaf leaf = static_cast<BspLeaf >(node);
3528	ViewCell *viewCell;
3529
3530	// question: always contribute to leaf or to currently active view cell?
3531	// if (0)
3532	// viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3533	// else
3534	viewCell = leaf->GetViewCell();
3535
3536	if (!viewCell->Mailed())
3537	{
3538	viewcells.push_back(viewCell);
3539	viewCell->Mail();
3540	++ hits;
3541	}
3542
3543	//-- fetch the next far child from the stack
3544	if (tStack.empty())
3545	break;
3546
3547	entp = extp;
3548
3549	const BspRayTraversalData &s = tStack.top();
3550
3551	node = s.mNode;
3552	extp = s.mExitPoint;
3553
3554	tStack.pop();
3555	}
3556	}
3557
3558	return hits;
3559	}
3560
3561
3562
3563
3564	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
3565	{
3566	std::deque<BspNode *> path1;
3567	BspNode *p1 = n1;
3568
3569	// create path from node 1 to root
3570	while (p1)
3571	{
3572	if (p1 == n2) // second node on path
3573	return (int)path1.size();
3574
3575	path1.push_front(p1);
3576	p1 = p1->GetParent();
3577	}
3578
3579	int depth = n2->GetDepth();
3580	int d = depth;
3581
3582	BspNode *p2 = n2;
3583
3584	// compare with same depth
3585	while (1)
3586	{
3587	if ((d < (int)path1.size()) && (p2 == path1[d]))
3588	return (depth - d) + ((int)path1.size() - 1 - d);
3589
3590	-- d;
3591	p2 = p2->GetParent();
3592	}
3593
3594	return 0; // never come here
3595	}
3596
3597
3598	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
3599	{
3600	// TODO
3601	#if HAS_TO_BE_REDONE
3602	if (node->IsLeaf())
3603	return node;
3604
3605	BspInterior interior = static_cast<BspInterior >(node);
3606
3607	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
3608	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
3609
3610	if (front->IsLeaf() && back->IsLeaf())
3611	{
3612	BspLeaf frontLeaf = static_cast<BspLeaf >(front);
3613	BspLeaf backLeaf = static_cast<BspLeaf >(back);
3614
3615	//-- collapse tree
3616	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
3617	{
3618	BspViewCell *vc = frontLeaf->GetViewCell();
3619
3620	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
3621	leaf->SetTreeValid(frontLeaf->TreeValid());
3622
3623	// replace a link from node's parent
3624	if (leaf->GetParent())
3625	leaf->GetParent()->ReplaceChildLink(node, leaf);
3626	else
3627	mRoot = leaf;
3628
3629	++ collapsed;
3630	delete interior;
3631
3632	return leaf;
3633	}
3634	}
3635	#endif
3636	return node;
3637	}
3638
3639
3640	int VspBspTree::CollapseTree()
3641	{
3642	int collapsed = 0;
3643	//TODO
3644	#if HAS_TO_BE_REDONE
3645	(void)CollapseTree(mRoot, collapsed);
3646
3647	// revalidate leaves
3648	RepairViewCellsLeafLists();
3649	#endif
3650	return collapsed;
3651	}
3652
3653
3654	void VspBspTree::RepairViewCellsLeafLists()
3655	{
3656	// TODO
3657	#if HAS_TO_BE_REDONE
3658	// list not valid anymore => clear
3659	stack<BspNode *> nodeStack;
3660	nodeStack.push(mRoot);
3661
3662	ViewCell::NewMail();
3663
3664	while (!nodeStack.empty())
3665	{
3666	BspNode *node = nodeStack.top();
3667	nodeStack.pop();
3668
3669	if (node->IsLeaf())
3670	{
3671	BspLeaf leaf = static_cast<BspLeaf >(node);
3672
3673	BspViewCell *viewCell = leaf->GetViewCell();
3674
3675	if (!viewCell->Mailed())
3676	{
3677	viewCell->mLeaves.clear();
3678	viewCell->Mail();
3679	}
3680
3681	viewCell->mLeaves.push_back(leaf);
3682
3683	}
3684	else
3685	{
3686	BspInterior interior = static_cast<BspInterior >(node);
3687
3688	nodeStack.push(interior->GetFront());
3689	nodeStack.push(interior->GetBack());
3690	}
3691	}
3692	// TODO
3693	#endif
3694	}
3695
3696
3697	int VspBspTree::CastBeam(Beam &beam)
3698	{
3699	stack<bspNodePair> nodeStack;
3700	BspNodeGeometry *rgeom = new BspNodeGeometry();
3701	ConstructGeometry(mRoot, *rgeom);
3702
3703	nodeStack.push(bspNodePair(mRoot, rgeom));
3704
3705	ViewCell::NewMail();
3706
3707	while (!nodeStack.empty())
3708	{
3709	BspNode *node = nodeStack.top().first;
3710	BspNodeGeometry *geom = nodeStack.top().second;
3711	nodeStack.pop();
3712
3713	AxisAlignedBox3 box;
3714	geom->GetBoundingBox(box);
3715
3716	const int side = beam.ComputeIntersection(box);
3717
3718	switch (side)
3719	{
3720	case -1:
3721	CollectViewCells(node, true, beam.mViewCells, true);
3722	break;
3723	case 0:
3724
3725	if (node->IsLeaf())
3726	{
3727	BspLeaf leaf = static_cast<BspLeaf >(node);
3728
3729	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
3730	{
3731	leaf->GetViewCell()->Mail();
3732	beam.mViewCells.push_back(leaf->GetViewCell());
3733	}
3734	}
3735	else
3736	{
3737	BspInterior interior = static_cast<BspInterior >(node);
3738
3739	BspNode *first = interior->GetFront();
3740	BspNode *second = interior->GetBack();
3741
3742	BspNodeGeometry *firstGeom = new BspNodeGeometry();
3743	BspNodeGeometry *secondGeom = new BspNodeGeometry();
3744
3745	geom->SplitGeometry(*firstGeom,
3746	*secondGeom,
3747	interior->GetPlane(),
3748	mBoundingBox,
3749	//0.0000001f);
3750	mEpsilon);
3751
3752	// decide on the order of the nodes
3753	if (DotProd(beam.mPlanes[0].mNormal,
3754	interior->GetPlane().mNormal) > 0)
3755	{
3756	swap(first, second);
3757	swap(firstGeom, secondGeom);
3758	}
3759
3760	nodeStack.push(bspNodePair(first, firstGeom));
3761	nodeStack.push(bspNodePair(second, secondGeom));
3762	}
3763
3764	break;
3765	default:
3766	// default: cull
3767	break;
3768	}
3769
3770	DEL_PTR(geom);
3771
3772	}
3773
3774	return (int)beam.mViewCells.size();
3775	}
3776
3777
3778	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
3779	{
3780	mViewCellsManager = vcm;
3781	}
3782
3783
3784	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
3785	vector<MergeCandidate> &candidates)
3786	{
3787	BspLeaf::NewMail();
3788
3789	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
3790
3791	int numCandidates = 0;
3792
3793	// find merge candidates and push them into queue
3794	for (it = leaves.begin(); it != it_end; ++ it)
3795	{
3796	BspLeaf leaf = it;
3797
3798	// the same leaves must not be part of two merge candidates
3799	leaf->Mail();
3800
3801	vector<BspLeaf *> neighbors;
3802
3803	// appoximate neighbor search has slightl relaxed constraints
3804	if (1)
3805	FindNeighbors(leaf, neighbors, true);
3806	else
3807	FindApproximateNeighbors(leaf, neighbors, true);
3808
3809	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
3810
3811	// TODO: test if at least one ray goes from one leaf to the other
3812	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
3813	{
3814	if ((*nit)->GetViewCell() != leaf->GetViewCell())
3815	{
3816	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
3817
3818	if (!leaf->GetViewCell()->GetPvs().Empty() \|\|
3819	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
3820	leaf->IsSibling(*nit))
3821	{
3822	candidates.push_back(mc);
3823	}
3824
3825	++ numCandidates;
3826	if ((numCandidates % 1000) == 0)
3827	{
3828	cout << "collected " << numCandidates << " merge candidates" << endl;
3829	}
3830	}
3831	}
3832	}
3833
3834	Debug << "merge queue: " << (int)candidates.size() << endl;
3835	Debug << "leaves in queue: " << numCandidates << endl;
3836
3837
3838	return (int)leaves.size();
3839	}
3840
3841
3842	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
3843	vector<MergeCandidate> &candidates)
3844	{
3845	ViewCell::NewMail();
3846	long startTime = GetTime();
3847
3848	map<BspLeaf , vector<BspLeaf> > neighborMap;
3849	ViewCellContainer::const_iterator iit;
3850
3851	int numLeaves = 0;
3852
3853	BspLeaf::NewMail();
3854
3855	for (int i = 0; i < (int)rays.size(); ++ i)
3856	{
3857	VssRay *ray = rays[i];
3858
3859	#if VSS_STORE_VIEWCELLS
3860	// traverse leaves stored in the rays and compare and
3861	// merge consecutive leaves (i.e., the neighbors in the tree)
3862	if (ray->mViewCells.size() < 2)
3863	continue;
3864
3865	iit = ray->mViewCells.begin();
3866	BspViewCell bspVc = static_cast<BspViewCell >(*(iit ++));
3867	BspLeaf *leaf = bspVc->mLeaves[0];
3868
3869	// traverse intersections
3870	// consecutive leaves are neighbors => add them to queue
3871	for (; iit != ray->mViewCells.end(); ++ iit)
3872	{
3873	// next pair
3874	BspLeaf *prevLeaf = leaf;
3875	bspVc = static_cast<BspViewCell >(iit);
3876	leaf = bspVc->mLeaves[0]; // exactly one leaf
3877
3878	// view space not valid or same view cell
3879	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3880	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3881	continue;
3882
3883	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3884
3885	bool found = false;
3886
3887	// both leaves inserted in queue already =>
3888	// look if double pair already exists
3889	if (leaf->Mailed() && prevLeaf->Mailed())
3890	{
3891	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3892
3893	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3894	if (*it == prevLeaf)
3895	found = true; // already in queue
3896	}
3897
3898	if (!found)
3899	{
3900	// this pair is not in map yet
3901	// => insert into the neighbor map and the queue
3902	neighbors.push_back(prevLeaf);
3903	neighborMap[prevLeaf].push_back(leaf);
3904
3905	leaf->Mail();
3906	prevLeaf->Mail();
3907
3908	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3909
3910	candidates.push_back(mc);
3911
3912	if (((int)candidates.size() % 1000) == 0)
3913	{
3914	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3915	}
3916	}
3917	}
3918	#endif
3919	}
3920
3921	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3922	Debug << "merge queue: " << (int)candidates.size() << endl;
3923	Debug << "leaves in queue: " << numLeaves << endl;
3924
3925
3926	//-- collect the leaves which haven't been found by ray casting
3927	if (0)
3928	{
3929	cout << "finding additional merge candidates using geometry" << endl;
3930	vector<BspLeaf *> leaves;
3931	CollectLeaves(leaves, true);
3932	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3933	CollectMergeCandidates(leaves, candidates);
3934	}
3935
3936	return numLeaves;
3937	}
3938
3939
3940
3941
3942	ViewCell *VspBspTree::GetViewCell(const Vector3 &point, const bool active)
3943	{
3944	if (mRoot == NULL)
3945	return NULL;
3946
3947	stack<BspNode *> nodeStack;
3948	nodeStack.push(mRoot);
3949
3950	ViewCellLeaf *viewcell = NULL;
3951
3952	while (!nodeStack.empty())
3953	{
3954	BspNode *node = nodeStack.top();
3955	nodeStack.pop();
3956
3957	if (node->IsLeaf())
3958	{
3959	viewcell = static_cast<BspLeaf *>(node)->GetViewCell();
3960	break;
3961	}
3962	else
3963	{
3964	BspInterior interior = static_cast<BspInterior >(node);
3965
3966	// random decision
3967	if (interior->GetPlane().Side(point) < 0)
3968	nodeStack.push(interior->GetBack());
3969	else
3970	nodeStack.push(interior->GetFront());
3971	}
3972	}
3973
3974	if (active)
3975	return mViewCellsTree->GetActiveViewCell(viewcell);
3976	else
3977	return viewcell;
3978	}
3979
3980
3981	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
3982	{
3983	BspNode *node = mRoot;
3984
3985	while (1)
3986	{
3987	// early exit
3988	if (node->TreeValid())
3989	return true;
3990
3991	if (node->IsLeaf())
3992	return false;
3993
3994	BspInterior in = static_cast<BspInterior >(node);
3995
3996	if (in->GetPlane().Side(viewPoint) <= 0)
3997	{
3998	node = in->GetBack();
3999	}
4000	else
4001	{
4002	node = in->GetFront();
4003	}
4004	}
4005
4006	// should never come here
4007	return false;
4008	}
4009
4010
4011	void VspBspTree::PropagateUpValidity(BspNode *node)
4012	{
4013	const bool isValid = node->TreeValid();
4014
4015	// propagative up invalid flag until only invalid nodes exist over this node
4016	if (!isValid)
4017	{
4018	while (!node->IsRoot() && node->GetParent()->TreeValid())
4019	{
4020	node = node->GetParent();
4021	node->SetTreeValid(false);
4022	}
4023	}
4024	else
4025	{
4026	// propagative up valid flag until one of the subtrees is invalid
4027	while (!node->IsRoot() && !node->TreeValid())
4028	{
4029	node = node->GetParent();
4030	BspInterior interior = static_cast<BspInterior >(node);
4031
4032	// the parent is valid iff both leaves are valid
4033	node->SetTreeValid(interior->GetBack()->TreeValid() &&
4034	interior->GetFront()->TreeValid());
4035	}
4036	}
4037	}
4038
4039
4040	bool VspBspTree::Export(OUT_STREAM &stream)
4041	{
4042	ExportNode(mRoot, stream);
4043	return true;
4044	}
4045
4046
4047	void VspBspTree::ExportNode(BspNode *node, OUT_STREAM &stream)
4048	{
4049	if (node->IsLeaf())
4050	{
4051	BspLeaf leaf = static_cast<BspLeaf >(node);
4052	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
4053
4054	int id = -1;
4055	if (viewCell != mOutOfBoundsCell)
4056	id = viewCell->GetId();
4057
4058	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
4059	}
4060	else
4061	{
4062	BspInterior interior = static_cast<BspInterior >(node);
4063
4064	Plane3 plane = interior->GetPlane();
4065	stream << "<Interior plane=\"" << plane.mNormal.x << " "
4066	<< plane.mNormal.y << " " << plane.mNormal.z << " "
4067	<< plane.mD << "\">" << endl;
4068
4069	ExportNode(interior->GetBack(), stream);
4070	ExportNode(interior->GetFront(), stream);
4071
4072	stream << "</Interior>" << endl;
4073	}
4074	}
4075
4076	}

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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 2627

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