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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 1418

Revision 1418, 98.1 KB checked in by mattausch, 18 years ago (diff)

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

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