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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 955

Revision 955, 94.0 KB checked in by mattausch, 19 years ago (diff)

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1	#include <stack>
2	#include <time.h>
3	#include <iomanip>
4
5	#include "Plane3.h"
6	#include "VspBspTree.h"
7	#include "Mesh.h"
8	#include "common.h"
9	#include "ViewCell.h"
10	#include "Environment.h"
11	#include "Polygon3.h"
12	#include "Ray.h"
13	#include "AxisAlignedBox3.h"
14	#include "Exporter.h"
15	#include "Plane3.h"
16	#include "ViewCellBsp.h"
17	#include "ViewCellsManager.h"
18	#include "Beam.h"
19
20	namespace GtpVisibilityPreprocessor {
21
22	#define USE_FIXEDPOINT_T 0
23
24
25	//-- static members
26
27
28	int VspBspTree::sFrontId = 0;
29	int VspBspTree::sBackId = 0;
30	int VspBspTree::sFrontAndBackId = 0;
31
32	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
33
34
35	// pvs penalty can be different from pvs size
36	inline static float EvalPvsPenalty(const int pvs,
37	const int lower,
38	const int upper)
39	{
40	// clamp to minmax values
41	if (pvs < lower)
42	return (float)lower;
43	if (pvs > upper)
44	return (float)upper;
45
46	return (float)pvs;
47	}
48
49
50
51
52	/******************************************************************************/
53	/* class VspBspTree implementation */
54	/******************************************************************************/
55
56
57	VspBspTree::VspBspTree(Environment *env):
58	mRoot(NULL),
59	mUseAreaForPvs(false),
60	mCostNormalizer(Limits::Small),
61	mViewCellsManager(NULL),
62	mOutOfBoundsCell(NULL),
63	mStoreRays(false),
64	mRenderCostWeight(0.5),
65	mUseRandomAxis(false),
66	mTimeStamp(1)
67	{
68	bool randomize = false;
69	env->GetBoolValue("VspBspTree.Construction.randomize", randomize);
70	if (randomize)
71	Randomize(); // initialise random generator for heuristics
72
73	//-- termination criteria for autopartition
74	env->GetIntValue("VspBspTree.Termination.maxDepth", mTermMaxDepth);
75	env->GetIntValue("VspBspTree.Termination.minPvs", mTermMinPvs);
76	env->GetIntValue("VspBspTree.Termination.minRays", mTermMinRays);
77	env->GetFloatValue("VspBspTree.Termination.minProbability", mTermMinProbability);
78	env->GetFloatValue("VspBspTree.Termination.maxRayContribution", mTermMaxRayContribution);
79	env->GetFloatValue("VspBspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
80	env->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
81	env->GetIntValue("VspBspTree.Termination.missTolerance", mTermMissTolerance);
82	env->GetIntValue("VspBspTree.Termination.maxViewCells", mMaxViewCells);
83
84	//-- max cost ratio for early tree termination
85	env->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
86
87	env->GetFloatValue("VspBspTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
88	env->GetIntValue("VspBspTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
89
90	// HACK//mTermMinPolygons = 25;
91
92	//-- factors for bsp tree split plane heuristics
93	env->GetFloatValue("VspBspTree.Factor.pvs", mPvsFactor);
94	env->GetFloatValue("VspBspTree.Termination.ct_div_ci", mCtDivCi);
95
96
97	//-- partition criteria
98	env->GetIntValue("VspBspTree.maxPolyCandidates", mMaxPolyCandidates);
99	env->GetIntValue("VspBspTree.maxRayCandidates", mMaxRayCandidates);
100	env->GetIntValue("VspBspTree.splitPlaneStrategy", mSplitPlaneStrategy);
101
102	env->GetFloatValue("VspBspTree.Construction.epsilon", mEpsilon);
103	env->GetIntValue("VspBspTree.maxTests", mMaxTests);
104
105	// if only the driving axis is used for axis aligned split
106	env->GetBoolValue("VspBspTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
107
108	//-- termination criteria for axis aligned split
109	env->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
110	mTermMaxRayContriForAxisAligned);
111	env->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
112	mTermMinRaysForAxisAligned);
113
114	//env->GetFloatValue("VspBspTree.maxTotalMemory", mMaxTotalMemory);
115	env->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
116
117	env->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
118	env->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
119
120	env->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
121	env->GetBoolValue("VspBspTree.useSplitCostQueue", mUseSplitCostQueue);
122	env->GetBoolValue("VspBspTree.simulateOctree", mCirculatingAxis);
123	env->GetBoolValue("VspBspTree.useRandomAxis", mUseRandomAxis);
124	env->GetIntValue("VspBspTree.nodePriorityQueueType", mNodePriorityQueueType);
125
126	env->GetBoolValue("ViewCells.PostProcess.emptyViewCellsMerge", mEmptyViewCellsMergeAllowed);
127
128	char subdivisionStatsLog[100];
129	env->GetStringValue("VspBspTree.subdivisionStats", subdivisionStatsLog);
130	mSubdivisionStats.open(subdivisionStatsLog);
131
132	env->GetFloatValue("VspBspTree.Construction.minBand", mMinBand);
133	env->GetFloatValue("VspBspTree.Construction.maxBand", mMaxBand);
134	env->GetBoolValue("VspBspTree.Construction.useDrivingAxisForMaxCost", mUseDrivingAxisForMaxCost);
135
136	//-- debug output
137
138	Debug << "***** VSP BSP options ****** " << endl;
139	Debug << "max depth: " << mTermMaxDepth << endl;
140	Debug << "min PVS: " << mTermMinPvs << endl;
141	Debug << "min probabiliy: " << mTermMinProbability << endl;
142	Debug << "min rays: " << mTermMinRays << endl;
143	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
144	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
145	Debug << "miss tolerance: " << mTermMissTolerance << endl;
146	Debug << "max view cells: " << mMaxViewCells << endl;
147	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
148	//Debug << "max plane candidates: " << mMaxRayCandidates << endl;
149	Debug << "randomize: " << randomize << endl;
150
151	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
152	Debug << "render cost weight: " << mRenderCostWeight << endl;
153	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
154	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
155	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
156	Debug << "max memory: " << mMaxMemory << endl;
157	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
158	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
159	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
160	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
161	Debug << "use random axis: " << mUseRandomAxis << endl;
162	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
163	Debug << "empty view cells merge: " << mEmptyViewCellsMergeAllowed << endl;
164	Debug << "circulating axis: " << mCirculatingAxis << endl;
165	Debug << "minband: " << mMinBand << endl;
166	Debug << "maxband: " << mMaxBand << endl;
167	Debug << "use driving axis for max cost: " << mUseDrivingAxisForMaxCost << endl;
168
169	Debug << "Split plane strategy: ";
170
171	if (mSplitPlaneStrategy & RANDOM_POLYGON)
172	{
173	Debug << "random polygon ";
174	}
175	if (mSplitPlaneStrategy & AXIS_ALIGNED)
176	{
177	Debug << "axis aligned ";
178	}
179	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
180	{
181	mCostNormalizer += mLeastRaySplitsFactor;
182	Debug << "least ray splits ";
183	}
184	if (mSplitPlaneStrategy & BALANCED_RAYS)
185	{
186	mCostNormalizer += mBalancedRaysFactor;
187	Debug << "balanced rays ";
188	}
189	if (mSplitPlaneStrategy & PVS)
190	{
191	mCostNormalizer += mPvsFactor;
192	Debug << "pvs";
193	}
194
195
196	mSplitCandidates = new vector<SortableEntry>;
197
198	Debug << endl;
199	}
200
201	VspBspTree::VspBspTree():
202	mRoot(NULL),
203	mUseAreaForPvs(false),
204	mCostNormalizer(Limits::Small),
205	mViewCellsManager(NULL),
206	mOutOfBoundsCell(NULL),
207	mStoreRays(false),
208	mRenderCostWeight(0.5),
209	mUseRandomAxis(false),
210	mTimeStamp(1),
211	mEpsilon(1e-6f)
212	{
213	}
214
215	BspViewCell *VspBspTree::GetOutOfBoundsCell()
216	{
217	return mOutOfBoundsCell;
218	}
219
220
221	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
222	{
223	if (!mOutOfBoundsCell)
224	{
225	mOutOfBoundsCell = new BspViewCell();
226	mOutOfBoundsCell->SetId(-1);
227	mOutOfBoundsCell->SetValid(false);
228	}
229
230	return mOutOfBoundsCell;
231	}
232
233
234	const BspTreeStatistics &VspBspTree::GetStatistics() const
235	{
236	return mBspStats;
237	}
238
239
240	VspBspTree::~VspBspTree()
241	{
242	DEL_PTR(mRoot);
243	DEL_PTR(mSplitCandidates);
244	}
245
246
247	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
248	PolygonContainer &polys,
249	MeshInstance *parent)
250	{
251	FaceContainer::const_iterator fi;
252
253	// copy the face data to polygons
254	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
255	{
256	Polygon3 poly = new Polygon3((fi), mesh);
257
258	if (poly->Valid(mEpsilon))
259	{
260	poly->mParent = parent; // set parent intersectable
261	polys.push_back(poly);
262	}
263	else
264	DEL_PTR(poly);
265	}
266	return (int)mesh->mFaces.size();
267	}
268
269
270	int VspBspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
271	PolygonContainer &polys,
272	int maxObjects)
273	{
274	int limit = (maxObjects > 0) ?
275	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
276
277	int polysSize = 0;
278
279	for (int i = 0; i < limit; ++ i)
280	{
281	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
282	{
283	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
284	polysSize +=
285	AddMeshToPolygons(viewCells[i]->GetMesh(),
286	polys,
287	viewCells[i]);
288	}
289	}
290
291	return polysSize;
292	}
293
294
295	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
296	PolygonContainer &polys,
297	int maxObjects)
298	{
299	int limit = (maxObjects > 0) ?
300	Min((int)objects.size(), maxObjects) : (int)objects.size();
301
302	for (int i = 0; i < limit; ++i)
303	{
304	Intersectable object = objects[i];//it;
305	Mesh *mesh = NULL;
306
307	switch (object->Type()) // extract the meshes
308	{
309	case Intersectable::MESH_INSTANCE:
310	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
311	break;
312	case Intersectable::VIEW_CELL:
313	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
314	break;
315	// TODO: handle transformed mesh instances
316	default:
317	Debug << "intersectable type not supported" << endl;
318	break;
319	}
320
321	if (mesh) // copy the mesh data to polygons
322	{
323	mBox.Include(object->GetBox()); // add to BSP tree aabb
324	AddMeshToPolygons(mesh, polys, NULL);
325	}
326	}
327
328	return (int)polys.size();
329	}
330
331
332	void VspBspTree::Construct(const VssRayContainer &sampleRays,
333	AxisAlignedBox3 *forcedBoundingBox)
334	{
335	mBspStats.nodes = 1;
336	mBox.Initialize(); // initialise BSP tree bounding box
337
338	if (forcedBoundingBox)
339	mBox = *forcedBoundingBox;
340
341	PolygonContainer polys;
342	RayInfoContainer *rays = new RayInfoContainer();
343
344	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
345
346	long startTime = GetTime();
347
348	cout << "Extracting polygons from rays ... ";
349
350	Intersectable::NewMail();
351
352	int numObj = 0;
353
354	//-- extract polygons intersected by the rays
355	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
356	{
357	VssRay ray = rit;
358
359	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
360	ray->mTerminationObject &&
361	!ray->mTerminationObject->Mailed())
362	{
363	ray->mTerminationObject->Mail();
364	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
365	AddMeshToPolygons(obj->GetMesh(), polys, obj);
366	++ numObj;
367
368	//-- compute bounding box
369	if (!forcedBoundingBox)
370	mBox.Include(ray->mTermination);
371	}
372
373	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
374	ray->mOriginObject &&
375	!ray->mOriginObject->Mailed())
376	{
377	ray->mOriginObject->Mail();
378	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
379	AddMeshToPolygons(obj->GetMesh(), polys, obj);
380	++ numObj;
381
382	//-- compute bounding box
383	if (!forcedBoundingBox)
384	mBox.Include(ray->mOrigin);
385	}
386	}
387
388	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
389	<< mViewCellsManager->GetMaxPvsSize() << endl;
390
391	//-- store rays
392	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
393	{
394	VssRay ray = rit;
395
396	float minT, maxT;
397
398	static Ray hray;
399	hray.Init(*ray);
400
401	// TODO: not very efficient to implictly cast between rays types
402	if (mBox.GetRaySegment(hray, minT, maxT))
403	{
404	float len = ray->Length();
405
406	if (!len)
407	len = Limits::Small;
408
409	rays->push_back(RayInfo(ray, minT / len, maxT / len));
410	}
411	}
412
413	// normalize
414	if (mUseAreaForPvs)
415	mTermMinProbability *= mBox.SurfaceArea();
416	else
417	mTermMinProbability *= mBox.GetVolume();
418
419	// throw out unnecessary polygons
420	PreprocessPolygons(polys);
421
422	mBspStats.polys = (int)polys.size();
423	mGlobalCostMisses = 0;
424
425	cout << "finished" << endl;
426
427	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
428	<< (int)sampleRays.size() << " rays in "
429	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
430
431	// use split cost priority queue
432	if (mUseSplitCostQueue)
433	{
434	ConstructWithSplitQueue(polys, rays);
435	}
436	else
437	{
438	Construct(polys, rays);
439	}
440
441	// clean up polygons
442	CLEAR_CONTAINER(polys);
443	}
444
445
446	// TODO: return memory usage in MB
447	float VspBspTree::GetMemUsage() const
448	{
449	return (float)
450	(sizeof(VspBspTree) +
451	mBspStats.Leaves() * sizeof(BspLeaf) +
452	mCreatedViewCells * sizeof(BspViewCell) +
453	mBspStats.pvs * sizeof(ObjectPvsData) +
454	mBspStats.Interior() * sizeof(BspInterior) +
455	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
456	}
457
458
459
460	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
461	{
462	VspBspTraversalQueue tQueue;
463
464	mRoot = new BspLeaf();
465
466	// constrruct root node geometry
467	BspNodeGeometry *geom = new BspNodeGeometry();
468	ConstructGeometry(mRoot, *geom);
469
470	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
471
472	VspBspTraversalData tData(mRoot,
473	new PolygonContainer(polys),
474	0,
475	rays,
476	ComputePvsSize(*rays),
477	prop,
478	geom);
479
480	EvalPriority(tData);
481
482
483	// first node is kd node, i.e. an axis aligned box
484	if (1)
485	tData.mIsKdNode = true;
486	else
487	tData.mIsKdNode = false;
488
489	tQueue.push(tData);
490
491
492	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
493	mTotalPvsSize = tData.mPvs;
494
495	mSubdivisionStats
496	<< "#ViewCells\n1" << endl
497	<< "#RenderCostDecrease\n0" << endl
498	<< "#TotalRenderCost\n" << mTotalCost << endl
499	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
500
501	Debug << "total cost: " << mTotalCost << endl;
502
503
504	mBspStats.Start();
505	cout << "Constructing vsp bsp tree ... \n";
506
507	long startTime = GetTime();
508	int nLeaves = 500;
509	int nViewCells = 500;
510
511	// used for intermediate time measurements and progress
512	long interTime = GetTime();
513
514	mOutOfMemory = false;
515
516	mCreatedViewCells = 0;
517
518	while (!tQueue.empty())
519	{
520	tData = tQueue.top();
521	tQueue.pop();
522
523	if (0 && !mOutOfMemory)
524	{
525	float mem = GetMemUsage();
526
527	if (mem > mMaxMemory)
528	{
529	mOutOfMemory = true;
530	Debug << "memory limit reached: " << mem << endl;
531	}
532	}
533
534	// subdivide leaf node
535	BspNode *r = Subdivide(tQueue, tData);
536
537	if (r == mRoot)
538	Debug << "VSP BSP tree construction time spent at root: "
539	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
540
541	if (mBspStats.Leaves() >= nLeaves)
542	{
543	nLeaves += 500;
544
545	cout << "leaves=" << mBspStats.Leaves() << endl;
546	Debug << "needed "
547	<< TimeDiff(interTime, GetTime())*1e-3
548	<< " secs to create 500 view cells" << endl;
549	interTime = GetTime();
550	}
551
552	if (mCreatedViewCells >= nViewCells)
553	{
554	nViewCells += 500;
555
556	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
557	}
558	}
559
560	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
561	cout << "finished\n";
562
563	mBspStats.Stop();
564	}
565
566
567
568	void VspBspTree::ConstructWithSplitQueue(const PolygonContainer &polys,
569	RayInfoContainer *rays)
570	{
571	VspBspSplitQueue tQueue;
572
573	mRoot = new BspLeaf();
574
575	// constrruct root node geometry
576	BspNodeGeometry *geom = new BspNodeGeometry();
577	ConstructGeometry(mRoot, *geom);
578
579	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
580
581	VspBspTraversalData tData(mRoot,
582	new PolygonContainer(polys),
583	0,
584	rays,
585	ComputePvsSize(*rays),
586	prop,
587	geom);
588
589
590	// compute first split candidate
591	VspBspSplitCandidate splitCandidate;
592	EvalSplitCandidate(tData, splitCandidate);
593
594	tQueue.push(splitCandidate);
595
596	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
597	mTotalPvsSize = tData.mPvs;
598
599	mSubdivisionStats
600	<< "#ViewCells\n1\n" << endl
601	<< "#RenderCostDecrease\n0\n" << endl
602	<< "#SplitCandidateCost\n0\n" << endl
603	<< "#TotalRenderCost\n" << mTotalCost << endl
604	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
605
606	Debug << "total cost: " << mTotalCost << endl;
607
608
609	mBspStats.Start();
610	cout << "Constructing vsp bsp tree ... \n";
611
612	long startTime = GetTime();
613	int nLeaves = 500;
614	int nViewCells = 500;
615
616	// used for intermediate time measurements and progress
617	long interTime = GetTime();
618
619	mOutOfMemory = false;
620
621	mCreatedViewCells = 0;
622
623	while (!tQueue.empty())
624	{
625	splitCandidate = tQueue.top();
626	tQueue.pop();
627
628	// cost ratio of cost decrease / totalCost
629	float costRatio = splitCandidate.GetCost() / mTotalCost;
630
631	//Debug << "cost ratio: " << costRatio << endl;
632
633	if (costRatio < mTermMinGlobalCostRatio)
634	++ mGlobalCostMisses;
635
636	if (0 && !mOutOfMemory)
637	{
638	float mem = GetMemUsage();
639
640	if (mem > mMaxMemory)
641	{
642	mOutOfMemory = true;
643	Debug << "memory limit reached: " << mem << endl;
644	}
645	}
646
647	// subdivide leaf node
648	BspNode *r = Subdivide(tQueue, splitCandidate);
649
650	if (r == mRoot)
651	Debug << "VSP BSP tree construction time spent at root: "
652	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
653
654	if (mBspStats.Leaves() >= nLeaves)
655	{
656	nLeaves += 500;
657
658	cout << "leaves=" << mBspStats.Leaves() << endl;
659	Debug << "needed "
660	<< TimeDiff(interTime, GetTime())*1e-3
661	<< " secs to create 500 view cells" << endl;
662	interTime = GetTime();
663	}
664
665	if (mCreatedViewCells == nViewCells)
666	{
667	nViewCells += 500;
668
669	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
670	}
671	}
672
673	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
674	cout << "finished\n";
675
676	mBspStats.Stop();
677	}
678
679
680	bool VspBspTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
681	{
682	return
683	(((int)data.mRays->size() <= mTermMinRays) \|\|
684	(data.mPvs <= mTermMinPvs) \|\|
685	(data.mProbability <= mTermMinProbability) \|\|
686	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
687	(data.mDepth >= mTermMaxDepth));
688	}
689
690
691	bool VspBspTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
692	{
693	return
694	(mOutOfMemory
695	\|\| (mBspStats.Leaves() >= mMaxViewCells)
696	\|\| (mGlobalCostMisses >= mTermGlobalCostMissTolerance)
697	);
698	}
699
700
701
702	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
703	VspBspTraversalData &tData)
704	{
705	BspNode *newNode = tData.mNode;
706
707	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
708	{
709	PolygonContainer coincident;
710
711	VspBspTraversalData tFrontData;
712	VspBspTraversalData tBackData;
713
714	// create new interior node and two leaf nodes
715	// or return leaf as it is (if maxCostRatio missed)
716	int splitAxis;
717	bool splitFurther = true;
718	int maxCostMisses = tData.mMaxCostMisses;
719
720	Plane3 splitPlane;
721	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
722
723	// choose next split plane
724	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
725	{
726	++ maxCostMisses;
727
728	if (maxCostMisses > mTermMissTolerance)
729	{
730	// terminate branch because of max cost
731	++ mBspStats.maxCostNodes;
732	splitFurther = false;
733	}
734	}
735
736	// if this a valid split => subdivide this node further
737	if (splitFurther) //-- continue subdivision
738	{
739	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
740
741	if (splitAxis < 3)
742	++ mBspStats.splits[splitAxis];
743	else
744	++ mBspStats.polySplits;
745
746	// if it was a kd node (i.e., a box) and the split axis is axis aligned, it is still a kd node
747	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
748	tFrontData.mAxis = tBackData.mAxis = splitAxis;
749
750	// how often was max cost ratio missed in this branch?
751	tFrontData.mMaxCostMisses = maxCostMisses;
752	tBackData.mMaxCostMisses = maxCostMisses;
753
754	EvalPriority(tFrontData);
755	EvalPriority(tBackData);
756
757	// evaluate subdivision stats
758	if (1)
759	{
760	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
761	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
762	float cData = (float)tData.mPvs * tData.mProbability;;
763
764	float costDecr = (cFront + cBack - cData) / mBox.GetVolume();
765
766	mTotalCost += costDecr;
767	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
768
769	mSubdivisionStats
770	<< "#ViewCells\n" << mBspStats.Leaves() << endl
771	<< "#RenderCostDecrease\n" << -costDecr << endl
772	<< "#TotalRenderCost\n" << mTotalCost << endl
773	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
774	}
775
776	// push the children on the stack
777	tQueue.push(tFrontData);
778	tQueue.push(tBackData);
779
780	// delete old leaf node
781	DEL_PTR(tData.mNode);
782	}
783	}
784
785	//-- terminate traversal and create new view cell
786	if (newNode->IsLeaf())
787	{
788	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
789	BspViewCell *viewCell = new BspViewCell();
790
791	leaf->SetViewCell(viewCell);
792
793	//-- update pvs
794	int conSamp = 0;
795	float sampCon = 0.0f;
796	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
797
798	// update single pvs parameter
799	viewCell->mPvsSize = viewCell->GetPvs().GetSize();
800	viewCell->mPvsSizeValid = true;
801
802
803	mBspStats.contributingSamples += conSamp;
804	mBspStats.sampleContributions +=(int) sampCon;
805
806	//-- store additional info
807	if (mStoreRays)
808	{
809	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
810	for (it = tData.mRays->begin(); it != it_end; ++ it)
811	{
812	(*it).mRay->Ref();
813	leaf->mVssRays.push_back((*it).mRay);
814	}
815	}
816
817	// should I check here?
818	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0, mViewCellsManager->GetMaxPvsSize()))
819	{
820	viewCell->SetValid(false);
821	leaf->SetTreeValid(false);
822	PropagateUpValidity(leaf);
823
824	++ mBspStats.invalidLeaves;
825	}
826
827	viewCell->mLeaf = leaf;
828
829	if (mUseAreaForPvs)
830	viewCell->SetArea(tData.mProbability);
831	else
832	viewCell->SetVolume(tData.mProbability);
833
834	leaf->mProbability = tData.mProbability;
835
836	EvaluateLeafStats(tData);
837	}
838
839	//-- cleanup
840	tData.Clear();
841
842	return newNode;
843	}
844
845	// subdivide using a split plane queue
846	BspNode *VspBspTree::Subdivide(VspBspSplitQueue &tQueue,
847	VspBspSplitCandidate &splitCandidate)
848	{
849	VspBspTraversalData &tData = splitCandidate.mParentData;
850
851	BspNode *newNode = tData.mNode;
852
853	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
854	{
855	PolygonContainer coincident;
856
857	VspBspTraversalData tFrontData;
858	VspBspTraversalData tBackData;
859
860	//-- continue subdivision
861
862	// create new interior node and two leaf node
863	const Plane3 splitPlane = splitCandidate.mSplitPlane;
864
865	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
866
867	const int splitAxis = splitCandidate.mSplitAxis;
868	const int maxCostMisses = splitCandidate.mMaxCostMisses;
869
870	if (splitAxis < 3)
871	++ mBspStats.splits[splitAxis];
872	else
873	++ mBspStats.polySplits;
874
875	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
876	tFrontData.mAxis = tBackData.mAxis = splitAxis;
877
878	// how often was max cost ratio missed in this branch?
879	tFrontData.mMaxCostMisses = maxCostMisses;
880	tBackData.mMaxCostMisses = maxCostMisses;
881
882
883	if (1)
884	{
885	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
886	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
887	float cData = (float)tData.mPvs * tData.mProbability;
888
889
890	float costDecr =
891	(cFront + cBack - cData) / mBox.GetVolume();
892
893	mTotalCost += costDecr;
894	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
895
896	mSubdivisionStats
897	<< "#ViewCells\n" << mBspStats.Leaves() << endl
898	<< "#RenderCostDecrease\n" << -costDecr << endl
899	<< "#SplitCandidateCost\n" << splitCandidate.GetCost() << endl
900	<< "#TotalRenderCost\n" << mTotalCost << endl
901	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
902	}
903
904
905	//-- push the new split candidates on the stack
906	VspBspSplitCandidate frontCandidate;
907	VspBspSplitCandidate backCandidate;
908
909	EvalSplitCandidate(tFrontData, frontCandidate);
910	EvalSplitCandidate(tBackData, backCandidate);
911
912	tQueue.push(frontCandidate);
913	tQueue.push(backCandidate);
914
915	// delete old leaf node
916	DEL_PTR(tData.mNode);
917	}
918
919
920	//-- terminate traversal and create new view cell
921	if (newNode->IsLeaf())
922	{
923	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
924	BspViewCell *viewCell = new BspViewCell();
925
926	leaf->SetViewCell(viewCell);
927
928	//-- update pvs
929	int conSamp = 0;
930	float sampCon = 0.0f;
931	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
932
933	viewCell->mPvsSize = viewCell->GetPvs().GetSize();
934	viewCell->mPvsSizeValid = true;
935
936	mBspStats.contributingSamples += conSamp;
937	mBspStats.sampleContributions +=(int) sampCon;
938
939	//-- store additional info
940	if (mStoreRays)
941	{
942	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
943	for (it = tData.mRays->begin(); it != it_end; ++ it)
944	{
945	(*it).mRay->Ref();
946	leaf->mVssRays.push_back((*it).mRay);
947	}
948	}
949
950	// should I check here?
951	viewCell->mLeaf = leaf;
952
953	if (mUseAreaForPvs)
954	viewCell->SetArea(tData.mProbability);
955	else
956	viewCell->SetVolume(tData.mProbability);
957
958	leaf->mProbability = tData.mProbability;
959
960	EvaluateLeafStats(tData);
961	}
962
963	//-- cleanup
964	tData.Clear();
965
966	return newNode;
967	}
968
969
970	void VspBspTree::EvalPriority(VspBspTraversalData &tData) const
971	{
972	switch (mNodePriorityQueueType)
973	{
974	case BREATH_FIRST:
975	tData.mPriority = (float)-tData.mDepth;
976	break;
977	case DEPTH_FIRST:
978	tData.mPriority = (float)tData.mDepth;
979	break;
980	default:
981	tData.mPriority = tData.mPvs * tData.mProbability;
982	//Debug << "priority: " << tData.mPriority << endl;
983	break;
984	}
985	}
986
987
988	void VspBspTree::EvalSplitCandidate(VspBspTraversalData &tData,
989	VspBspSplitCandidate &splitData)
990	{
991	VspBspTraversalData frontData;
992	VspBspTraversalData backData;
993
994	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
995
996	// compute locally best split plane
997	bool success = SelectPlane(splitData.mSplitPlane, leaf, tData,
998	frontData, backData, splitData.mSplitAxis);
999
1000	// TODO: reuse
1001	DEL_PTR(frontData.mGeometry);
1002	DEL_PTR(backData.mGeometry);
1003
1004	// compute global decrease in render cost
1005	splitData.mRenderCost = EvalRenderCostDecrease(splitData.mSplitPlane, tData);
1006	splitData.mParentData = tData;
1007	splitData.mMaxCostMisses = success ? tData.mMaxCostMisses : tData.mMaxCostMisses + 1;
1008	}
1009
1010
1011	BspInterior *VspBspTree::SubdivideNode(const Plane3 &splitPlane,
1012	VspBspTraversalData &tData,
1013	VspBspTraversalData &frontData,
1014	VspBspTraversalData &backData,
1015	PolygonContainer &coincident)
1016	{
1017	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
1018
1019	//-- the front and back traversal data is filled with the new values
1020	frontData.mDepth = tData.mDepth + 1;
1021	frontData.mPolygons = new PolygonContainer();
1022	frontData.mRays = new RayInfoContainer();
1023
1024	backData.mDepth = tData.mDepth + 1;
1025	backData.mPolygons = new PolygonContainer();
1026	backData.mRays = new RayInfoContainer();
1027
1028
1029	//-- subdivide rays
1030	SplitRays(splitPlane,
1031	*tData.mRays,
1032	*frontData.mRays,
1033	*backData.mRays);
1034
1035
1036	// compute pvs
1037	frontData.mPvs = ComputePvsSize(*frontData.mRays);
1038	backData.mPvs = ComputePvsSize(*backData.mRays);
1039
1040	// split front and back node geometry and compute area
1041
1042	// if geometry was not already computed
1043	if (!frontData.mGeometry && !backData.mGeometry)
1044	{
1045	frontData.mGeometry = new BspNodeGeometry();
1046	backData.mGeometry = new BspNodeGeometry();
1047
1048	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
1049	*backData.mGeometry,
1050	splitPlane,
1051	mBox,
1052	//0.0f);
1053	mEpsilon);
1054
1055	if (mUseAreaForPvs)
1056	{
1057	frontData.mProbability = frontData.mGeometry->GetArea();
1058	backData.mProbability = backData.mGeometry->GetArea();
1059	}
1060	else
1061	{
1062	frontData.mProbability = frontData.mGeometry->GetVolume();
1063	backData.mProbability = tData.mProbability - frontData.mProbability;
1064
1065	// should never come here: wrong volume !!!
1066	if (0)
1067	{
1068	if (frontData.mProbability < -0.00001)
1069	Debug << "fatal error f: " << frontData.mProbability << endl;
1070	if (backData.mProbability < -0.00001)
1071	Debug << "fatal error b: " << backData.mProbability << endl;
1072
1073	// clamp because of precision issues
1074	if (frontData.mProbability < 0) frontData.mProbability = 0;
1075	if (backData.mProbability < 0) backData.mProbability = 0;
1076	}
1077	}
1078	}
1079
1080
1081	// subdivide polygons
1082	SplitPolygons(splitPlane,
1083	*tData.mPolygons,
1084	*frontData.mPolygons,
1085	*backData.mPolygons,
1086	coincident);
1087
1088
1089
1090	///////////////////////////////////////
1091	// subdivide further
1092
1093	// store maximal and minimal depth
1094	if (tData.mDepth > mBspStats.maxDepth)
1095	{
1096	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
1097	mBspStats.maxDepth = tData.mDepth;
1098	}
1099
1100	mBspStats.nodes += 2;
1101
1102
1103	BspInterior *interior = new BspInterior(splitPlane);
1104
1105	#ifdef _DEBUG
1106	Debug << interior << endl;
1107	#endif
1108
1109
1110	//-- create front and back leaf
1111
1112	BspInterior *parent = leaf->GetParent();
1113
1114	// replace a link from node's parent
1115	if (parent)
1116	{
1117	parent->ReplaceChildLink(leaf, interior);
1118	interior->SetParent(parent);
1119	}
1120	else // new root
1121	{
1122	mRoot = interior;
1123	}
1124
1125	// and setup child links
1126	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
1127
1128	frontData.mNode = interior->GetFront();
1129	backData.mNode = interior->GetBack();
1130
1131	interior->mTimeStamp = mTimeStamp ++;
1132
1133
1134	//DEL_PTR(leaf);
1135	return interior;
1136	}
1137
1138
1139	void VspBspTree::AddToPvs(BspLeaf *leaf,
1140	const RayInfoContainer &rays,
1141	float &sampleContributions,
1142	int &contributingSamples)
1143	{
1144	sampleContributions = 0;
1145	contributingSamples = 0;
1146
1147	RayInfoContainer::const_iterator it, it_end = rays.end();
1148
1149	ViewCellLeaf *vc = leaf->GetViewCell();
1150
1151	// add contributions from samples to the PVS
1152	for (it = rays.begin(); it != it_end; ++ it)
1153	{
1154	float sc = 0.0f;
1155	VssRay ray = (it).mRay;
1156	bool madeContrib = false;
1157	float contribution;
1158	if (ray->mTerminationObject) {
1159	if (vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf, contribution))
1160	madeContrib = true;
1161	sc += contribution;
1162	}
1163
1164	if (ray->mOriginObject) {
1165	if (vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf, contribution))
1166	madeContrib = true;
1167	sc += contribution;
1168	}
1169
1170	sampleContributions += sc;
1171	if (madeContrib)
1172	++ contributingSamples;
1173
1174	//leaf->mVssRays.push_back(ray);
1175	}
1176	}
1177
1178
1179	void VspBspTree::SortSplitCandidates(const RayInfoContainer &rays,
1180	const int axis,
1181	float minBand,
1182	float maxBand)
1183	{
1184	mSplitCandidates->clear();
1185
1186	int requestedSize = 2 * (int)(rays.size());
1187	// creates a sorted split candidates array
1188	if (mSplitCandidates->capacity() > 500000 &&
1189	requestedSize < (int)(mSplitCandidates->capacity() / 10) )
1190	{
1191	delete mSplitCandidates;
1192	mSplitCandidates = new vector<SortableEntry>;
1193	}
1194
1195	mSplitCandidates->reserve(requestedSize);
1196
1197	float pos;
1198
1199	// float values => don't compare with exact values
1200	if (0)
1201	{
1202	minBand += Limits::Small;
1203	maxBand -= Limits::Small;
1204	}
1205
1206	// insert all queries
1207	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
1208	{
1209	const bool positive = (*ri).mRay->HasPosDir(axis);
1210
1211	pos = (*ri).ExtrapOrigin(axis);
1212	// clamp to min / max band
1213	if (0) ClipValue(pos, minBand, maxBand);
1214
1215	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
1216	pos, (*ri).mRay));
1217
1218	pos = (*ri).ExtrapTermination(axis);
1219	// clamp to min / max band
1220	if (0) ClipValue(pos, minBand, maxBand);
1221
1222	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
1223	pos, (*ri).mRay));
1224	}
1225
1226	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
1227	}
1228
1229
1230	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
1231	const AxisAlignedBox3 &box,
1232	const int pvsSize,
1233	const int axis,
1234	float &position)
1235	{
1236	const float minBox = box.Min(axis);
1237	const float maxBox = box.Max(axis);
1238
1239	const float sizeBox = maxBox - minBox;
1240
1241	const float minBand = minBox + mMinBand * sizeBox;
1242	const float maxBand = minBox + mMaxBand * sizeBox;
1243
1244	SortSplitCandidates(rays, axis, minBand, maxBand);
1245
1246	// go through the lists, count the number of objects left and right
1247	// and evaluate the following cost funcion:
1248	// C = ct_div_ci + (qlrl + qrrr)/queries
1249
1250	int pvsl = 0;
1251	int pvsr = pvsSize;
1252
1253	int pvsBack = pvsl;
1254	int pvsFront = pvsr;
1255
1256	float sum = (float)pvsSize * sizeBox;
1257	float minSum = 1e20f;
1258
1259
1260	// if no border can be found, take mid split
1261	position = minBox + 0.5f * sizeBox;
1262
1263	// the relative cost ratio
1264	float ratio = /Limits::Infinity;/99999999.0f;
1265	bool splitPlaneFound = false;
1266
1267	Intersectable::NewMail();
1268
1269	RayInfoContainer::const_iterator ri, ri_end = rays.end();
1270
1271	// set all object as belonging to the front pvs
1272	for(ri = rays.begin(); ri != ri_end; ++ ri)
1273	{
1274	Intersectable oObject = (ri).mRay->mOriginObject;
1275	Intersectable tObject = (ri).mRay->mTerminationObject;
1276
1277	if (oObject)
1278	{
1279	if (!oObject->Mailed())
1280	{
1281	oObject->Mail();
1282	oObject->mCounter = 1;
1283	}
1284	else
1285	{
1286	++ oObject->mCounter;
1287	}
1288	}
1289	if (tObject)
1290	{
1291	if (!tObject->Mailed())
1292	{
1293	tObject->Mail();
1294	tObject->mCounter = 1;
1295	}
1296	else
1297	{
1298	++ tObject->mCounter;
1299	}
1300	}
1301	}
1302
1303	Intersectable::NewMail();
1304
1305	vector<SortableEntry>::const_iterator ci, ci_end = mSplitCandidates->end();
1306
1307	for (ci = mSplitCandidates->begin(); ci != ci_end; ++ ci)
1308	{
1309	VssRay *ray;
1310	ray = (*ci).ray;
1311
1312	Intersectable *oObject = ray->mOriginObject;
1313	Intersectable *tObject = ray->mTerminationObject;
1314
1315
1316	switch ((*ci).type)
1317	{
1318	case SortableEntry::ERayMin:
1319	{
1320	if (oObject && !oObject->Mailed())
1321	{
1322	oObject->Mail();
1323	++ pvsl;
1324	}
1325	if (tObject && !tObject->Mailed())
1326	{
1327	tObject->Mail();
1328	++ pvsl;
1329	}
1330	break;
1331	}
1332	case SortableEntry::ERayMax:
1333	{
1334	if (oObject)
1335	{
1336	if (-- oObject->mCounter == 0)
1337	-- pvsr;
1338	}
1339
1340	if (tObject)
1341	{
1342	if (-- tObject->mCounter == 0)
1343	-- pvsr;
1344	}
1345
1346	break;
1347	}
1348	}
1349
1350
1351
1352	// Note: sufficient to compare size of bounding boxes of front and back side?
1353	if (((ci).value >= minBand) && ((ci).value <= maxBand))
1354	{
1355	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
1356
1357	//Debug << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
1358	//Debug << "cost= " << sum << endl;
1359
1360	if (sum < minSum)
1361	{
1362	splitPlaneFound = true;
1363
1364	minSum = sum;
1365	position = (*ci).value;
1366
1367	pvsBack = pvsl;
1368	pvsFront = pvsr;
1369	}
1370	}
1371	}
1372
1373
1374	// -- compute cost
1375	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1376	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1377
1378	const float pOverall = sizeBox;
1379
1380	const float pBack = position - minBox;
1381	const float pFront = maxBox - position;
1382
1383	const float penaltyOld = EvalPvsPenalty(pvsSize, lowerPvsLimit, upperPvsLimit);
1384	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1385	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1386
1387	const float oldRenderCost = penaltyOld * pOverall;
1388	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1389
1390	if (splitPlaneFound)
1391	{
1392	ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
1393	}
1394	//if (axis != 1)
1395	//Debug << "axis=" << axis << " costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
1396	// <<"\t pb=(" << pvsBack << ")\t pf=(" << pvsFront << ")" << endl;
1397
1398	return ratio;
1399	}
1400
1401
1402	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
1403	const VspBspTraversalData &tData,
1404	int &axis,
1405	BspNodeGeometry **frontGeom,
1406	BspNodeGeometry **backGeom,
1407	float &pFront,
1408	float &pBack,
1409	const bool isKdNode)
1410	{
1411	float nPosition[3];
1412	float nCostRatio[3];
1413	float nProbFront[3];
1414	float nProbBack[3];
1415
1416	BspNodeGeometry *nFrontGeom[3];
1417	BspNodeGeometry *nBackGeom[3];
1418
1419	// set to NULL, so I can find out which gemetry was stored
1420	for (int i = 0; i < 3; ++ i)
1421	{
1422	nFrontGeom[i] = NULL;
1423	nBackGeom[i] = NULL;
1424	}
1425
1426	// create bounding box of node geometry
1427	AxisAlignedBox3 box;
1428
1429	//TODO: for kd split geometry already is box => only take minmax vertices
1430	if (1)
1431	{
1432	// get bounding box from geometry
1433	tData.mGeometry->GetBoundingBox(box);
1434	}
1435	else
1436	{
1437	box.Initialize();
1438	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1439
1440	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1441	box.Include((*ri).ExtrapTermination());
1442	}
1443
1444	int sAxis = 0;
1445	int bestAxis;
1446
1447	// if max cost ratio is exceeded, take split along longest axis instead
1448	const float maxCostRatioForArbitraryAxis = 0.9f;
1449
1450	if (mUseDrivingAxisForMaxCost)
1451	bestAxis = box.Size().DrivingAxis();
1452	else
1453	bestAxis = -1;
1454
1455	// mximum cost ratio for axis to be valid:
1456	// if exceeded, spatial mid split is used instead
1457	//const maxCostRatioForHeur = 0.99f;
1458
1459
1460	const bool useSpecialAxis =
1461	mOnlyDrivingAxis \|\| mUseRandomAxis \|\| mCirculatingAxis;
1462
1463
1464	// use some kind of specialised fixed axis
1465	if (mUseRandomAxis)
1466	sAxis = Random(3);
1467	else if (mCirculatingAxis)
1468	sAxis = (tData.mAxis + 1) % 3;
1469	else if (mOnlyDrivingAxis)
1470	sAxis = box.Size().DrivingAxis();
1471
1472
1473	//Debug << "use special axis: " << useSpecialAxis << endl;
1474	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
1475
1476	for (axis = 0; axis < 3 ; ++ axis)
1477	{
1478	if (!useSpecialAxis \|\| (axis == sAxis))
1479	{
1480	//-- place split plane using heuristics
1481
1482	if (mUseCostHeuristics)
1483	{
1484	nCostRatio[axis] =
1485	BestCostRatioHeuristics(*tData.mRays,
1486	box,
1487	tData.mPvs,
1488	axis,
1489	nPosition[axis]);
1490	}
1491
1492	//-- split plane position is spatial median
1493
1494
1495	// also use median split if cost ratio very low as
1496	// there are not enough visibility cues
1497	//if (!mUseCostHeuristics \|\| (nCostRatio[axis] > maxCostRatioForHeur))
1498	else
1499	{
1500
1501	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1502	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1503
1504	// allows faster split because we have axis aligned kd tree boxes
1505	if (isKdNode)
1506	{
1507	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1508	box,
1509	axis,
1510	nPosition[axis],
1511	nProbFront[axis],
1512	nProbBack[axis]);
1513
1514	Vector3 pos;
1515
1516	// create back geometry from box
1517	// NOTE: the geometry is saved when possible
1518	pos = box.Max(); pos[axis] = nPosition[axis];
1519	AxisAlignedBox3 bBox(box.Min(), pos);
1520	PolygonContainer fPolys;
1521	bBox.ExtractPolys(fPolys);
1522
1523	nBackGeom[axis] = new BspNodeGeometry(fPolys);
1524
1525	//-- create front geometry from box
1526	pos = box.Min(); pos[axis] = nPosition[axis];
1527	AxisAlignedBox3 fBox(pos, box.Max());
1528
1529	PolygonContainer bPolys;
1530	fBox.ExtractPolys(bPolys);
1531	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
1532	}
1533	else
1534	{
1535	nFrontGeom[axis] = new BspNodeGeometry();
1536	nBackGeom[axis] = new BspNodeGeometry();
1537
1538	nCostRatio[axis] =
1539	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1540	tData, nFrontGeom[axis], nBackGeom[axis],
1541	nProbFront[axis], nProbBack[axis]);
1542	}
1543	}
1544
1545
1546	if (!mUseDrivingAxisForMaxCost)
1547	{
1548	if (bestAxis == -1)
1549	{
1550	bestAxis = axis;
1551	}
1552	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1553	{
1554	bestAxis = axis;
1555	}
1556	}
1557	else
1558	{
1559	// NOTE: takes longest axis split if cost ratio exceeds threshold
1560	if (nCostRatio[axis] < min(maxCostRatioForArbitraryAxis, nCostRatio[bestAxis]))
1561	{
1562	bestAxis = axis;
1563	}
1564	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1565	Debug << "taking split along longest axis (" << bestAxis << ") instead of (" << axis << ")" << endl;
1566
1567	}
1568	}
1569	}
1570
1571	//-- assign values
1572	axis = bestAxis;
1573	pFront = nProbFront[bestAxis];
1574	pBack = nProbBack[bestAxis];
1575
1576	// assign best split nodes geometry
1577	*frontGeom = nFrontGeom[bestAxis];
1578	*backGeom = nBackGeom[bestAxis];
1579
1580	// and delete other geometry
1581	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1582	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1583
1584	//-- split plane
1585	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1586	plane = Plane3(normal, nPosition[bestAxis]);
1587
1588	//Debug << "best axis: " << bestAxis << " pos " << nPosition[bestAxis] << endl;
1589	//Debug << "!!!!!!!!!!!!!!" << endl;
1590	return nCostRatio[bestAxis];
1591	}
1592
1593
1594	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
1595	BspLeaf *leaf,
1596	VspBspTraversalData &data,
1597	VspBspTraversalData &frontData,
1598	VspBspTraversalData &backData,
1599	int &splitAxis)
1600	{
1601	// HACK matt: subdivide regularily to certain depth
1602	if (data.mDepth < 0)
1603	{
1604	cout << "d: " << data.mDepth << endl;
1605	// return axis aligned split
1606	AxisAlignedBox3 box;
1607	box.Initialize();
1608
1609	// create bounding box of region
1610	data.mGeometry->GetBoundingBox(box);
1611
1612	const int axis = box.Size().DrivingAxis();
1613	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1614
1615	Vector3 norm(0,0,0); norm[axis] = 1.0f;
1616	bestPlane = Plane3(norm, position);
1617	splitAxis = axis;
1618	return true;
1619	}
1620
1621	// simplest strategy: just take next polygon
1622	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1623	{
1624	if (!data.mPolygons->empty())
1625	{
1626	const int randIdx =
1627	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
1628	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1629
1630	bestPlane = nextPoly->GetSupportingPlane();
1631	return true;
1632	}
1633	}
1634
1635	//-- use heuristics to find appropriate plane
1636
1637	// intermediate plane
1638	Plane3 plane;
1639	float lowestCost = MAX_FLOAT;
1640
1641	// decides if the first few splits should be only axisAligned
1642	const bool onlyAxisAligned =
1643	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1644	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1645	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1646
1647	const int limit = onlyAxisAligned ? 0 :
1648	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1649
1650	float candidateCost;
1651
1652	int maxIdx = (int)data.mPolygons->size();
1653
1654	for (int i = 0; i < limit; ++ i)
1655	{
1656	// the already taken candidates are stored behind maxIdx
1657	// => assure that no index is taken twice
1658	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1659	Polygon3 poly = (data.mPolygons)[candidateIdx];
1660
1661	// swap candidate to the end to avoid testing same plane
1662	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1663	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
1664
1665	// evaluate current candidate
1666	BspNodeGeometry fGeom, bGeom;
1667	float fArea, bArea;
1668	plane = poly->GetSupportingPlane();
1669	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1670
1671	if (candidateCost < lowestCost)
1672	{
1673	bestPlane = plane;
1674	lowestCost = candidateCost;
1675	}
1676	}
1677
1678	//-- evaluate axis aligned splits
1679	int axis;
1680	BspNodeGeometry fGeom, bGeom;
1681	float pFront, pBack;
1682
1683	candidateCost = 99999999.0f;
1684
1685	// option: axis aligned split only if no polygon available
1686	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
1687	{
1688	candidateCost = SelectAxisAlignedPlane(plane,
1689	data,
1690	axis,
1691	&fGeom,
1692	&bGeom,
1693	pFront,
1694	pBack,
1695	data.mIsKdNode);
1696	}
1697
1698	splitAxis = 3;
1699
1700	if (candidateCost < lowestCost)
1701	{
1702	bestPlane = plane;
1703	lowestCost = candidateCost;
1704	splitAxis = axis;
1705
1706	// assign already computed values
1707	// we can do this because we always save the
1708	// computed values from the axis aligned splits
1709
1710	if (fGeom && bGeom)
1711	{
1712	frontData.mGeometry = fGeom;
1713	backData.mGeometry = bGeom;
1714
1715	frontData.mProbability = pFront;
1716	backData.mProbability = pBack;
1717	}
1718	}
1719	else
1720	{
1721	DEL_PTR(fGeom);
1722	DEL_PTR(bGeom);
1723	}
1724
1725	#ifdef _DEBUG
1726	Debug << "plane lowest cost: " << lowestCost << endl;
1727	#endif
1728
1729	// exeeded relative max cost ratio
1730	if (lowestCost > mTermMaxCostRatio)
1731	{
1732	return false;
1733	}
1734
1735	return true;
1736	}
1737
1738
1739	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1740	{
1741	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1742
1743	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1744	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1745
1746	const Vector3 pt = (maxPt + minPt) * 0.5;
1747	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1748
1749	return Plane3(normal, pt);
1750	}
1751
1752
1753	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1754	{
1755	Vector3 pt[3];
1756
1757	int idx[3];
1758	int cmaxT = 0;
1759	int cminT = 0;
1760	bool chooseMin = false;
1761
1762	for (int j = 0; j < 3; ++ j)
1763	{
1764	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1765
1766	if (idx[j] >= (int)rays.size())
1767	{
1768	idx[j] -= (int)rays.size();
1769
1770	chooseMin = (cminT < 2);
1771	}
1772	else
1773	chooseMin = (cmaxT < 2);
1774
1775	RayInfo rayInf = rays[idx[j]];
1776	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1777	}
1778
1779	return Plane3(pt[0], pt[1], pt[2]);
1780	}
1781
1782
1783	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1784	{
1785	Vector3 pt[3];
1786
1787	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1788	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1789
1790	// check if rays different
1791	if (idx1 == idx2)
1792	idx2 = (idx2 + 1) % (int)rays.size();
1793
1794	const RayInfo ray1 = rays[idx1];
1795	const RayInfo ray2 = rays[idx2];
1796
1797	// normal vector of the plane parallel to both lines
1798	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1799
1800	// vector from line 1 to line 2
1801	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1802
1803	// project vector on normal to get distance
1804	const float dist = DotProd(vd, norm);
1805
1806	// point on plane lies halfway between the two planes
1807	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1808
1809	return Plane3(norm, planePt);
1810	}
1811
1812
1813	inline void VspBspTree::GenerateUniqueIdsForPvs()
1814	{
1815	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1816	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1817	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1818	}
1819
1820
1821	float VspBspTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
1822	const VspBspTraversalData &data) const
1823	{
1824	float pvsFront = 0;
1825	float pvsBack = 0;
1826	float totalPvs = 0;
1827
1828	// probability that view point lies in back / front node
1829	float pOverall = data.mProbability;
1830	float pFront = 0;
1831	float pBack = 0;
1832
1833
1834	// create unique ids for pvs heuristics
1835	GenerateUniqueIdsForPvs();
1836
1837	for (int i = 0; i < data.mRays->size(); ++ i)
1838	{
1839	RayInfo rayInf = (*data.mRays)[i];
1840
1841	float t;
1842	VssRay *ray = rayInf.mRay;
1843	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1844
1845	// find front and back pvs for origing and termination object
1846	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
1847	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
1848	}
1849
1850
1851	BspNodeGeometry geomFront;
1852	BspNodeGeometry geomBack;
1853
1854	// construct child geometry with regard to the candidate split plane
1855	data.mGeometry->SplitGeometry(geomFront,
1856	geomBack,
1857	candidatePlane,
1858	mBox,
1859	//0.0f);
1860	mEpsilon);
1861
1862	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
1863	{
1864	pFront = geomFront.GetVolume();
1865	pBack = pOverall - pFront;
1866
1867	// something is wrong with the volume
1868	if ((pFront < 0.0) \|\| (pBack < 0.0))
1869	{
1870	Debug << "ERROR in volume:\n"
1871	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
1872	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
1873	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
1874	}
1875	}
1876	else
1877	{
1878	pFront = geomFront.GetArea();
1879	pBack = geomBack.GetArea();
1880	}
1881
1882
1883	// -- pvs rendering heuristics
1884	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1885	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1886
1887	// only render cost heuristics or combined with standard deviation
1888	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
1889	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1890	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1891
1892	const float oldRenderCost = pOverall * penaltyOld;
1893	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1894
1895	//Debug << "decrease: " << oldRenderCost - newRenderCost << endl;
1896	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBox.GetVolume();
1897
1898
1899	#if 1
1900	// take render cost of node into account
1901	const float normalizedOldRenderCost = oldRenderCost / mBox.GetVolume();
1902	//Debug << "rendercostdecr: " << 0.99f * renderCostDecrease << " old render cost: " << 0.01f * normalizedOldRenderCost << endl;
1903	//return 0.5f * renderCostDecrease + 0.5f * normalizedOldRenderCost;
1904	return 0.99f * renderCostDecrease + 0.01f * normalizedOldRenderCost;
1905	#else
1906	return renderCostDecrease;
1907	#endif
1908	}
1909
1910
1911	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
1912	const VspBspTraversalData &data,
1913	BspNodeGeometry &geomFront,
1914	BspNodeGeometry &geomBack,
1915	float &pFront,
1916	float &pBack) const
1917	{
1918	float cost = 0;
1919
1920	float totalPvs = 0;
1921	float pvsFront = 0;
1922	float pvsBack = 0;
1923
1924	// probability that view point lies in back / front node
1925	float pOverall = 0;
1926	pFront = 0;
1927	pBack = 0;
1928
1929
1930	int limit;
1931	bool useRand;
1932
1933	// create unique ids for pvs heuristics
1934	GenerateUniqueIdsForPvs();
1935
1936	// choose test rays randomly if too much
1937	if ((int)data.mRays->size() > mMaxTests)
1938	{
1939	useRand = true;
1940	limit = mMaxTests;
1941	}
1942	else
1943	{
1944	useRand = false;
1945	limit = (int)data.mRays->size();
1946	}
1947
1948	for (int i = 0; i < limit; ++ i)
1949	{
1950	const int testIdx = useRand ?
1951	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
1952	RayInfo rayInf = (*data.mRays)[testIdx];
1953
1954	float t;
1955	VssRay *ray = rayInf.mRay;
1956	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1957
1958	// find front and back pvs for origing and termination object
1959	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
1960	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
1961	}
1962
1963	// construct child geometry with regard to the candidate split plane
1964	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
1965	geomBack,
1966	candidatePlane,
1967	mBox,
1968	//0.0f);
1969	mEpsilon);
1970
1971	pOverall = data.mProbability;
1972
1973	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
1974	{
1975	pFront = geomFront.GetVolume();
1976	pBack = pOverall - pFront;
1977
1978	// HACK: precision issues possible for unbalanced split => don't take this split!
1979	if (1 &&
1980	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
1981	!geomFront.Valid() \|\| !geomBack.Valid()))
1982	{
1983	//Debug << "error f: " << pFront << " b: " << pBack << endl;
1984	// high penalty for this split
1985	return 99999.9f;
1986	}
1987	}
1988	else
1989	{
1990	pFront = geomFront.GetArea();
1991	pBack = geomBack.GetArea();
1992	}
1993
1994
1995	// -- pvs rendering heuristics
1996	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1997	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1998
1999	// only render cost heuristics or combined with standard deviation
2000	const float penaltyOld = EvalPvsPenalty((int)totalPvs, lowerPvsLimit, upperPvsLimit);
2001	const float penaltyFront = EvalPvsPenalty((int)pvsFront, lowerPvsLimit, upperPvsLimit);
2002	const float penaltyBack = EvalPvsPenalty((int)pvsBack, lowerPvsLimit, upperPvsLimit);
2003
2004	const float oldRenderCost = pOverall * penaltyOld;
2005	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2006
2007	float oldCost, newCost;
2008
2009	// only render cost
2010	if (1)
2011	{
2012	oldCost = oldRenderCost;
2013	newCost = newRenderCost;
2014	}
2015	else // also considering standard deviation
2016	{
2017	// standard deviation is difference of back and front pvs
2018	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
2019
2020	const float newDeviation = 0.5f *
2021	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
2022
2023	const float oldDeviation = penaltyOld;
2024
2025	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
2026	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
2027	}
2028
2029	cost += mPvsFactor * newCost / (oldCost + Limits::Small);
2030
2031
2032	#ifdef _DEBUG
2033	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
2034	<< " frontpvs: " << pvsFront << " pFront: " << pFront
2035	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
2036	Debug << "cost: " << cost << endl;
2037	#endif
2038
2039	return cost;
2040	}
2041
2042
2043	int VspBspTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
2044	ViewCellContainer &viewCells) const
2045	{
2046	stack<bspNodePair> nodeStack;
2047	BspNodeGeometry *rgeom = new BspNodeGeometry();
2048
2049	ConstructGeometry(mRoot, *rgeom);
2050
2051	nodeStack.push(bspNodePair(mRoot, rgeom));
2052
2053	ViewCell::NewMail();
2054
2055	while (!nodeStack.empty())
2056	{
2057	BspNode *node = nodeStack.top().first;
2058	BspNodeGeometry *geom = nodeStack.top().second;
2059	nodeStack.pop();
2060
2061	const int side = geom->ComputeIntersection(box);
2062
2063	switch (side)
2064	{
2065	case -1:
2066	// node geometry is contained in box
2067	CollectViewCells(node, true, viewCells, true);
2068	break;
2069
2070	case 0:
2071	if (node->IsLeaf())
2072	{
2073	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2074
2075	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2076	{
2077	leaf->GetViewCell()->Mail();
2078	viewCells.push_back(leaf->GetViewCell());
2079	}
2080	}
2081	else
2082	{
2083	BspInterior interior = dynamic_cast<BspInterior >(node);
2084
2085	BspNode *first = interior->GetFront();
2086	BspNode *second = interior->GetBack();
2087
2088	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2089	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2090
2091	geom->SplitGeometry(*firstGeom,
2092	*secondGeom,
2093	interior->GetPlane(),
2094	mBox,
2095	//0.0000001f);
2096	mEpsilon);
2097
2098	nodeStack.push(bspNodePair(first, firstGeom));
2099	nodeStack.push(bspNodePair(second, secondGeom));
2100	}
2101
2102	break;
2103	default:
2104	// default: cull
2105	break;
2106	}
2107
2108	DEL_PTR(geom);
2109
2110	}
2111
2112	return (int)viewCells.size();
2113	}
2114
2115
2116	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
2117	const AxisAlignedBox3 &box,
2118	const int axis,
2119	const float &position,
2120	float &pFront,
2121	float &pBack) const
2122	{
2123	float pvsTotal = 0;
2124	float pvsFront = 0;
2125	float pvsBack = 0;
2126
2127	// create unique ids for pvs heuristics
2128	GenerateUniqueIdsForPvs();
2129
2130	const int pvsSize = data.mPvs;
2131
2132	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
2133
2134	// this is the main ray classification loop!
2135	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
2136	{
2137	//if (!(*rit).mRay->IsActive()) continue;
2138
2139	// determine the side of this ray with respect to the plane
2140	float t;
2141	const int side = (*rit).ComputeRayIntersection(axis, position, t);
2142
2143	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
2144	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
2145	}
2146
2147	//-- pvs heuristics
2148	float pOverall;
2149
2150	//-- compute heurstics
2151	//-- we take simplified computation for mid split
2152
2153	pOverall = data.mProbability;
2154
2155	if (!mUseAreaForPvs)
2156	{ // volume
2157	pBack = pFront = pOverall * 0.5f;
2158
2159	#if 0
2160	// box length substitute for probability
2161	const float minBox = box.Min(axis);
2162	const float maxBox = box.Max(axis);
2163
2164	pBack = position - minBox;
2165	pFront = maxBox - position;
2166	pOverall = maxBox - minBox;
2167	#endif
2168	}
2169	else //-- area substitute for probability
2170	{
2171	const int axis2 = (axis + 1) % 3;
2172	const int axis3 = (axis + 2) % 3;
2173
2174	const float faceArea =
2175	(box.Max(axis2) - box.Min(axis2)) *
2176	(box.Max(axis3) - box.Min(axis3));
2177
2178	pBack = pFront = pOverall * 0.5f + faceArea;
2179	}
2180
2181	#ifdef _DEBUG
2182	Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
2183	Debug << pFront << " " << pBack << " " << pOverall << endl;
2184	#endif
2185
2186
2187	const float newCost = pvsBack * pBack + pvsFront * pFront;
2188	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
2189
2190	return (mCtDivCi + newCost) / oldCost;
2191	}
2192
2193
2194	void VspBspTree::AddObjToPvs(Intersectable *obj,
2195	const int cf,
2196	float &frontPvs,
2197	float &backPvs,
2198	float &totalPvs) const
2199	{
2200	if (!obj)
2201	return;
2202
2203	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
2204
2205	// new object
2206	if ((obj->mMailbox != sFrontId) &&
2207	(obj->mMailbox != sBackId) &&
2208	(obj->mMailbox != sFrontAndBackId))
2209	{
2210	totalPvs += renderCost;
2211	}
2212
2213	// TODO: does this really belong to no pvs?
2214	//if (cf == Ray::COINCIDENT) return;
2215
2216	// object belongs to both PVS
2217	if (cf >= 0)
2218	{
2219	if ((obj->mMailbox != sFrontId) &&
2220	(obj->mMailbox != sFrontAndBackId))
2221	{
2222	frontPvs += renderCost;
2223
2224	if (obj->mMailbox == sBackId)
2225	obj->mMailbox = sFrontAndBackId;
2226	else
2227	obj->mMailbox = sFrontId;
2228	}
2229	}
2230
2231	if (cf <= 0)
2232	{
2233	if ((obj->mMailbox != sBackId) &&
2234	(obj->mMailbox != sFrontAndBackId))
2235	{
2236	backPvs += renderCost;
2237
2238	if (obj->mMailbox == sFrontId)
2239	obj->mMailbox = sFrontAndBackId;
2240	else
2241	obj->mMailbox = sBackId;
2242	}
2243	}
2244	}
2245
2246
2247	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
2248	const bool onlyUnmailed,
2249	const int maxPvsSize) const
2250	{
2251	stack<BspNode *> nodeStack;
2252	nodeStack.push(mRoot);
2253
2254	while (!nodeStack.empty())
2255	{
2256	BspNode *node = nodeStack.top();
2257	nodeStack.pop();
2258
2259	if (node->IsLeaf())
2260	{
2261	// test if this leaf is in valid view space
2262	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2263	if (leaf->TreeValid() &&
2264	(!onlyUnmailed \|\| !leaf->Mailed()) &&
2265	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().GetSize() <= maxPvsSize)))
2266	{
2267	leaves.push_back(leaf);
2268	}
2269	}
2270	else
2271	{
2272	BspInterior interior = dynamic_cast<BspInterior >(node);
2273
2274	nodeStack.push(interior->GetBack());
2275	nodeStack.push(interior->GetFront());
2276	}
2277	}
2278	}
2279
2280
2281	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
2282	{
2283	return mBox;
2284	}
2285
2286
2287	BspNode *VspBspTree::GetRoot() const
2288	{
2289	return mRoot;
2290	}
2291
2292
2293	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
2294	{
2295	// the node became a leaf -> evaluate stats for leafs
2296	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
2297
2298
2299	if (data.mPvs > mBspStats.maxPvs)
2300	{
2301	mBspStats.maxPvs = data.mPvs;
2302	}
2303
2304	mBspStats.pvs += data.mPvs;
2305
2306	if (data.mDepth < mBspStats.minDepth)
2307	{
2308	mBspStats.minDepth = data.mDepth;
2309	}
2310
2311	if (data.mDepth >= mTermMaxDepth)
2312	{
2313	++ mBspStats.maxDepthNodes;
2314	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
2315	}
2316
2317	// accumulate rays to compute rays / leaf
2318	mBspStats.accumRays += (int)data.mRays->size();
2319
2320	if (data.mPvs < mTermMinPvs)
2321	++ mBspStats.minPvsNodes;
2322
2323	if ((int)data.mRays->size() < mTermMinRays)
2324	++ mBspStats.minRaysNodes;
2325
2326	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
2327	++ mBspStats.maxRayContribNodes;
2328
2329	if (data.mProbability <= mTermMinProbability)
2330	++ mBspStats.minProbabilityNodes;
2331
2332	// accumulate depth to compute average depth
2333	mBspStats.accumDepth += data.mDepth;
2334
2335	++ mCreatedViewCells;
2336
2337	#ifdef _DEBUG
2338	Debug << "BSP stats: "
2339	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
2340	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
2341	// << "Area: " << data.mProbability << " (min: " << mTermMinProbability << "), "
2342	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
2343	<< "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
2344	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
2345	#endif
2346	}
2347
2348
2349	int VspBspTree::CastRay(Ray &ray)
2350	{
2351	int hits = 0;
2352
2353	stack<BspRayTraversalData> tQueue;
2354
2355	float maxt, mint;
2356
2357	if (!mBox.GetRaySegment(ray, mint, maxt))
2358	return 0;
2359
2360	Intersectable::NewMail();
2361	ViewCell::NewMail();
2362	Vector3 entp = ray.Extrap(mint);
2363	Vector3 extp = ray.Extrap(maxt);
2364
2365	BspNode *node = mRoot;
2366	BspNode *farChild = NULL;
2367
2368	while (1)
2369	{
2370	if (!node->IsLeaf())
2371	{
2372	BspInterior in = dynamic_cast<BspInterior >(node);
2373
2374	Plane3 splitPlane = in->GetPlane();
2375	const int entSide = splitPlane.Side(entp);
2376	const int extSide = splitPlane.Side(extp);
2377
2378	if (entSide < 0)
2379	{
2380	node = in->GetBack();
2381
2382	if(extSide <= 0) // plane does not split ray => no far child
2383	continue;
2384
2385	farChild = in->GetFront(); // plane splits ray
2386
2387	} else if (entSide > 0)
2388	{
2389	node = in->GetFront();
2390
2391	if (extSide >= 0) // plane does not split ray => no far child
2392	continue;
2393
2394	farChild = in->GetBack(); // plane splits ray
2395	}
2396	else // ray and plane are coincident
2397	{
2398	// WHAT TO DO IN THIS CASE ?
2399	//break;
2400	node = in->GetFront();
2401	continue;
2402	}
2403
2404	// push data for far child
2405	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
2406
2407	// find intersection of ray segment with plane
2408	float t;
2409	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
2410	maxt *= t;
2411
2412	} else // reached leaf => intersection with view cell
2413	{
2414	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2415
2416	if (!leaf->GetViewCell()->Mailed())
2417	{
2418	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
2419	leaf->GetViewCell()->Mail();
2420	++ hits;
2421	}
2422
2423	//-- fetch the next far child from the stack
2424	if (tQueue.empty())
2425	break;
2426
2427	entp = extp;
2428	mint = maxt; // NOTE: need this?
2429
2430	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
2431	break;
2432
2433	BspRayTraversalData &s = tQueue.top();
2434
2435	node = s.mNode;
2436	extp = s.mExitPoint;
2437	maxt = s.mMaxT;
2438
2439	tQueue.pop();
2440	}
2441	}
2442
2443	return hits;
2444	}
2445
2446
2447	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const
2448	{
2449	ViewCell::NewMail();
2450
2451	CollectViewCells(mRoot, onlyValid, viewCells, true);
2452	}
2453
2454
2455	void VspBspTree::CollapseViewCells()
2456	{
2457	// TODO
2458	#if HAS_TO_BE_REDONE
2459	stack<BspNode *> nodeStack;
2460
2461	if (!mRoot)
2462	return;
2463
2464	nodeStack.push(mRoot);
2465
2466	while (!nodeStack.empty())
2467	{
2468	BspNode *node = nodeStack.top();
2469	nodeStack.pop();
2470
2471	if (node->IsLeaf())
2472	{
2473	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2474
2475	if (!viewCell->GetValid())
2476	{
2477	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2478
2479	ViewCellContainer leaves;
2480	mViewCellsTree->CollectLeaves(viewCell, leaves);
2481
2482	ViewCellContainer::const_iterator it, it_end = leaves.end();
2483
2484	for (it = leaves.begin(); it != it_end; ++ it)
2485	{
2486	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2487	l->SetViewCell(GetOrCreateOutOfBoundsCell());
2488	++ mBspStats.invalidLeaves;
2489	}
2490
2491	// add to unbounded view cell
2492	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
2493	DEL_PTR(viewCell);
2494	}
2495	}
2496	else
2497	{
2498	BspInterior interior = dynamic_cast<BspInterior >(node);
2499
2500	nodeStack.push(interior->GetFront());
2501	nodeStack.push(interior->GetBack());
2502	}
2503	}
2504
2505	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2506	#endif
2507	}
2508
2509
2510	void VspBspTree::CollectRays(VssRayContainer &rays)
2511	{
2512	vector<BspLeaf *> leaves;
2513
2514	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
2515
2516	for (lit = leaves.begin(); lit != lit_end; ++ lit)
2517	{
2518	BspLeaf leaf = lit;
2519	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
2520
2521	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
2522	rays.push_back(*rit);
2523	}
2524	}
2525
2526
2527	void VspBspTree::ValidateTree()
2528	{
2529	stack<BspNode *> nodeStack;
2530
2531	if (!mRoot)
2532	return;
2533
2534	nodeStack.push(mRoot);
2535
2536	mBspStats.invalidLeaves = 0;
2537	while (!nodeStack.empty())
2538	{
2539	BspNode *node = nodeStack.top();
2540	nodeStack.pop();
2541
2542	if (node->IsLeaf())
2543	{
2544	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2545
2546	if (!leaf->GetViewCell()->GetValid())
2547	++ mBspStats.invalidLeaves;
2548
2549	// validity flags don't match => repair
2550	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
2551	{
2552	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
2553	PropagateUpValidity(leaf);
2554	}
2555	}
2556	else
2557	{
2558	BspInterior interior = dynamic_cast<BspInterior >(node);
2559
2560	nodeStack.push(interior->GetFront());
2561	nodeStack.push(interior->GetBack());
2562	}
2563	}
2564
2565	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2566	}
2567
2568
2569
2570	void VspBspTree::CollectViewCells(BspNode *root,
2571	bool onlyValid,
2572	ViewCellContainer &viewCells,
2573	bool onlyUnmailed) const
2574	{
2575	stack<BspNode *> nodeStack;
2576
2577	if (!root)
2578	return;
2579
2580	nodeStack.push(root);
2581
2582	while (!nodeStack.empty())
2583	{
2584	BspNode *node = nodeStack.top();
2585	nodeStack.pop();
2586
2587	if (node->IsLeaf())
2588	{
2589	if (!onlyValid \|\| node->TreeValid())
2590	{
2591	ViewCellLeaf leafVc = dynamic_cast<BspLeaf >(node)->GetViewCell();
2592
2593	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
2594
2595	if (!onlyUnmailed \|\| !viewCell->Mailed())
2596	{
2597	viewCell->Mail();
2598	viewCells.push_back(viewCell);
2599	}
2600	}
2601	}
2602	else
2603	{
2604	BspInterior interior = dynamic_cast<BspInterior >(node);
2605
2606	nodeStack.push(interior->GetFront());
2607	nodeStack.push(interior->GetBack());
2608	}
2609	}
2610
2611	}
2612
2613
2614	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
2615	{
2616	// preprocess: throw out polygons coincident to the view space box (not needed)
2617	PolygonContainer boxPolys;
2618	mBox.ExtractPolys(boxPolys);
2619	vector<Plane3> boxPlanes;
2620
2621	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2622
2623	// extract planes of box
2624	// TODO: can be done more elegantly than first extracting polygons
2625	// and take their planes
2626	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2627	{
2628	boxPlanes.push_back((*pit)->GetSupportingPlane());
2629	}
2630
2631	pit_end = polys.end();
2632
2633	for (pit = polys.begin(); pit != pit_end; ++ pit)
2634	{
2635	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2636
2637	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2638	{
2639	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2640
2641	if (cf == Polygon3::COINCIDENT)
2642	{
2643	DEL_PTR(*pit);
2644	//Debug << "coincident!!" << endl;
2645	}
2646	}
2647	}
2648
2649	// remove deleted entries
2650	for (int i = 0; i < (int)polys.size(); ++ i)
2651	{
2652	while (!polys[i] && (i < (int)polys.size()))
2653	{
2654	swap(polys[i], polys.back());
2655	polys.pop_back();
2656	}
2657	}
2658	}
2659
2660
2661	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2662	{
2663	float len = 0;
2664
2665	RayInfoContainer::const_iterator it, it_end = rays.end();
2666
2667	for (it = rays.begin(); it != it_end; ++ it)
2668	len += (*it).SegmentLength();
2669
2670	return len;
2671	}
2672
2673
2674	int VspBspTree::SplitRays(const Plane3 &plane,
2675	RayInfoContainer &rays,
2676	RayInfoContainer &frontRays,
2677	RayInfoContainer &backRays) const
2678	{
2679	int splits = 0;
2680
2681	RayInfoContainer::const_iterator it, it_end = rays.end();
2682
2683	for (it = rays.begin(); it != it_end; ++ it)
2684	{
2685	RayInfo bRay = *it;
2686
2687	VssRay *ray = bRay.mRay;
2688	float t;
2689
2690	// get classification and receive new t
2691	const int cf = bRay.ComputeRayIntersection(plane, t);
2692
2693	switch (cf)
2694	{
2695	case -1:
2696	backRays.push_back(bRay);
2697	break;
2698	case 1:
2699	frontRays.push_back(bRay);
2700	break;
2701	case 0:
2702	{
2703	//-- split ray
2704	// test if start point behind or in front of plane
2705	const int side = plane.Side(bRay.ExtrapOrigin());
2706
2707	if (side <= 0)
2708	{
2709	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2710	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2711	}
2712	else
2713	{
2714	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2715	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2716	}
2717	}
2718	break;
2719	default:
2720	Debug << "Should not come here" << endl;
2721	break;
2722	}
2723	}
2724
2725	return splits;
2726	}
2727
2728
2729	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2730	{
2731	BspNode *lastNode;
2732
2733	do
2734	{
2735	lastNode = n;
2736
2737	// want to get planes defining geometry of this node => don't take
2738	// split plane of node itself
2739	n = n->GetParent();
2740
2741	if (n)
2742	{
2743	BspInterior interior = dynamic_cast<BspInterior >(n);
2744	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
2745
2746	if (interior->GetBack() != lastNode)
2747	halfSpace.ReverseOrientation();
2748
2749	halfSpaces.push_back(halfSpace);
2750	}
2751	}
2752	while (n);
2753	}
2754
2755
2756	void VspBspTree::ConstructGeometry(BspNode *n,
2757	BspNodeGeometry &geom) const
2758	{
2759	vector<Plane3> halfSpaces;
2760	ExtractHalfSpaces(n, halfSpaces);
2761
2762	PolygonContainer candidatePolys;
2763	vector<Plane3> candidatePlanes;
2764
2765	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
2766
2767	// bounded planes are added to the polygons
2768	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
2769	{
2770	Polygon3 p = GetBoundingBox().CrossSection(pit);
2771
2772	if (p->Valid(mEpsilon))
2773	{
2774	candidatePolys.push_back(p);
2775	candidatePlanes.push_back(*pit);
2776	}
2777	}
2778
2779	// add faces of bounding box (also could be faces of the cell)
2780	for (int i = 0; i < 6; ++ i)
2781	{
2782	VertexContainer vertices;
2783
2784	for (int j = 0; j < 4; ++ j)
2785	vertices.push_back(mBox.GetFace(i).mVertices[j]);
2786
2787	Polygon3 *poly = new Polygon3(vertices);
2788
2789	candidatePolys.push_back(poly);
2790	candidatePlanes.push_back(poly->GetSupportingPlane());
2791	}
2792
2793	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2794	{
2795	// polygon is split by all other planes
2796	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2797	{
2798	if (i == j) // polygon and plane are coincident
2799	continue;
2800
2801	VertexContainer splitPts;
2802	Polygon3 frontPoly, backPoly;
2803
2804	const int cf =
2805	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2806	mEpsilon);
2807
2808	switch (cf)
2809	{
2810	case Polygon3::SPLIT:
2811	frontPoly = new Polygon3();
2812	backPoly = new Polygon3();
2813
2814	candidatePolys[i]->Split(halfSpaces[j],
2815	*frontPoly,
2816	*backPoly,
2817	mEpsilon);
2818
2819	DEL_PTR(candidatePolys[i]);
2820
2821	if (backPoly->Valid(mEpsilon))
2822	candidatePolys[i] = backPoly;
2823	else
2824	DEL_PTR(backPoly);
2825
2826	// outside, don't need this
2827	DEL_PTR(frontPoly);
2828	break;
2829	// polygon outside of halfspace
2830	case Polygon3::FRONT_SIDE:
2831	DEL_PTR(candidatePolys[i]);
2832	break;
2833	// just take polygon as it is
2834	case Polygon3::BACK_SIDE:
2835	case Polygon3::COINCIDENT:
2836	default:
2837	break;
2838	}
2839	}
2840
2841	if (candidatePolys[i])
2842	{
2843	geom.Add(candidatePolys[i], candidatePlanes[i]);
2844	// geom.mPolys.push_back(candidates[i]);
2845	}
2846	}
2847	}
2848
2849
2850	void VspBspTree::ConstructGeometry(ViewCell *vc,
2851	BspNodeGeometry &vcGeom) const
2852	{
2853	ViewCellContainer leaves;
2854
2855	mViewCellsTree->CollectLeaves(vc, leaves);
2856
2857	ViewCellContainer::const_iterator it, it_end = leaves.end();
2858
2859	for (it = leaves.begin(); it != it_end; ++ it)
2860	{
2861	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2862
2863	ConstructGeometry(l, vcGeom);
2864	}
2865	}
2866
2867
2868	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
2869	const bool onlyUnmailed) const
2870	{
2871	stack<bspNodePair> nodeStack;
2872
2873	BspNodeGeometry nodeGeom;
2874	ConstructGeometry(n, nodeGeom);
2875	// const float eps = 0.5f;
2876	const float eps = 0.01f;
2877	// split planes from the root to this node
2878	// needed to verify that we found neighbor leaf
2879	// TODO: really needed?
2880	vector<Plane3> halfSpaces;
2881	ExtractHalfSpaces(n, halfSpaces);
2882
2883
2884	BspNodeGeometry *rgeom = new BspNodeGeometry();
2885	ConstructGeometry(mRoot, *rgeom);
2886
2887	nodeStack.push(bspNodePair(mRoot, rgeom));
2888
2889	while (!nodeStack.empty())
2890	{
2891	BspNode *node = nodeStack.top().first;
2892	BspNodeGeometry *geom = nodeStack.top().second;
2893
2894	nodeStack.pop();
2895
2896	if (node->IsLeaf())
2897	{
2898	// test if this leaf is in valid view space
2899	if (node->TreeValid() &&
2900	(node != n) &&
2901	(!onlyUnmailed \|\| !node->Mailed()))
2902	{
2903	bool isAdjacent = true;
2904
2905	if (1)
2906	{
2907	// test all planes of current node if still adjacent
2908	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
2909	{
2910	const int cf =
2911	Polygon3::ClassifyPlane(geom->GetPolys(),
2912	halfSpaces[i],
2913	eps);
2914
2915	if (cf == Polygon3::FRONT_SIDE)
2916	{
2917	isAdjacent = false;
2918	}
2919	}
2920	}
2921	else
2922	{
2923	// TODO: why is this wrong??
2924	// test all planes of current node if still adjacent
2925	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
2926	{
2927	Polygon3 *poly = nodeGeom.GetPolys()[i];
2928
2929	const int cf =
2930	Polygon3::ClassifyPlane(geom->GetPolys(),
2931	poly->GetSupportingPlane(),
2932	eps);
2933
2934	if (cf == Polygon3::FRONT_SIDE)
2935	{
2936	isAdjacent = false;
2937	}
2938	}
2939	}
2940	// neighbor was found
2941	if (isAdjacent)
2942	{
2943	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
2944	}
2945	}
2946	}
2947	else
2948	{
2949	BspInterior interior = dynamic_cast<BspInterior >(node);
2950
2951	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
2952	interior->GetPlane(),
2953	eps);
2954
2955	BspNode *front = interior->GetFront();
2956	BspNode *back = interior->GetBack();
2957
2958	BspNodeGeometry *fGeom = new BspNodeGeometry();
2959	BspNodeGeometry *bGeom = new BspNodeGeometry();
2960
2961	geom->SplitGeometry(*fGeom,
2962	*bGeom,
2963	interior->GetPlane(),
2964	mBox,
2965	//0.0000001f);
2966	eps);
2967
2968	if (cf == Polygon3::BACK_SIDE)
2969	{
2970	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
2971	DEL_PTR(fGeom);
2972	}
2973	else
2974	{
2975	if (cf == Polygon3::FRONT_SIDE)
2976	{
2977	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
2978	DEL_PTR(bGeom);
2979	}
2980	else
2981	{ // random decision
2982	nodeStack.push(bspNodePair(front, fGeom));
2983	nodeStack.push(bspNodePair(back, bGeom));
2984	}
2985	}
2986	}
2987
2988	DEL_PTR(geom);
2989	}
2990
2991	return (int)neighbors.size();
2992	}
2993
2994
2995
2996	int VspBspTree::FindApproximateNeighbors(BspNode *n,
2997	vector<BspLeaf *> &neighbors,
2998	const bool onlyUnmailed) const
2999	{
3000	stack<bspNodePair> nodeStack;
3001
3002	BspNodeGeometry nodeGeom;
3003	ConstructGeometry(n, nodeGeom);
3004
3005	float eps = 0.01f;
3006	// split planes from the root to this node
3007	// needed to verify that we found neighbor leaf
3008	// TODO: really needed?
3009	vector<Plane3> halfSpaces;
3010	ExtractHalfSpaces(n, halfSpaces);
3011
3012
3013	BspNodeGeometry *rgeom = new BspNodeGeometry();
3014	ConstructGeometry(mRoot, *rgeom);
3015
3016	nodeStack.push(bspNodePair(mRoot, rgeom));
3017
3018	while (!nodeStack.empty())
3019	{
3020	BspNode *node = nodeStack.top().first;
3021	BspNodeGeometry *geom = nodeStack.top().second;
3022
3023	nodeStack.pop();
3024
3025	if (node->IsLeaf())
3026	{
3027	// test if this leaf is in valid view space
3028	if (node->TreeValid() &&
3029	(node != n) &&
3030	(!onlyUnmailed \|\| !node->Mailed()))
3031	{
3032	bool isAdjacent = true;
3033
3034	// neighbor was found
3035	if (isAdjacent)
3036	{
3037	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
3038	}
3039	}
3040	}
3041	else
3042	{
3043	BspInterior interior = dynamic_cast<BspInterior >(node);
3044
3045	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3046	interior->GetPlane(),
3047	eps);
3048
3049	BspNode *front = interior->GetFront();
3050	BspNode *back = interior->GetBack();
3051
3052	BspNodeGeometry *fGeom = new BspNodeGeometry();
3053	BspNodeGeometry *bGeom = new BspNodeGeometry();
3054
3055	geom->SplitGeometry(*fGeom,
3056	*bGeom,
3057	interior->GetPlane(),
3058	mBox,
3059	//0.0000001f);
3060	eps);
3061
3062	if (cf == Polygon3::BACK_SIDE)
3063	{
3064	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3065	DEL_PTR(fGeom);
3066	}
3067	else
3068	{
3069	if (cf == Polygon3::FRONT_SIDE)
3070	{
3071	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3072	DEL_PTR(bGeom);
3073	}
3074	else
3075	{ // random decision
3076	nodeStack.push(bspNodePair(front, fGeom));
3077	nodeStack.push(bspNodePair(back, bGeom));
3078	}
3079	}
3080	}
3081
3082	DEL_PTR(geom);
3083	}
3084
3085	return (int)neighbors.size();
3086	}
3087
3088
3089
3090	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
3091	{
3092	stack<BspNode *> nodeStack;
3093	nodeStack.push(mRoot);
3094
3095	int mask = rand();
3096
3097	while (!nodeStack.empty())
3098	{
3099	BspNode *node = nodeStack.top();
3100	nodeStack.pop();
3101
3102	if (node->IsLeaf())
3103	{
3104	return dynamic_cast<BspLeaf *>(node);
3105	}
3106	else
3107	{
3108	BspInterior interior = dynamic_cast<BspInterior >(node);
3109	BspNode *next;
3110	BspNodeGeometry geom;
3111
3112	// todo: not very efficient: constructs full cell everytime
3113	ConstructGeometry(interior, geom);
3114
3115	const int cf =
3116	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
3117
3118	if (cf == Polygon3::BACK_SIDE)
3119	next = interior->GetFront();
3120	else
3121	if (cf == Polygon3::FRONT_SIDE)
3122	next = interior->GetFront();
3123	else
3124	{
3125	// random decision
3126	if (mask & 1)
3127	next = interior->GetBack();
3128	else
3129	next = interior->GetFront();
3130	mask = mask >> 1;
3131	}
3132
3133	nodeStack.push(next);
3134	}
3135	}
3136
3137	return NULL;
3138	}
3139
3140
3141	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
3142	{
3143	stack<BspNode *> nodeStack;
3144
3145	nodeStack.push(mRoot);
3146
3147	int mask = rand();
3148
3149	while (!nodeStack.empty())
3150	{
3151	BspNode *node = nodeStack.top();
3152	nodeStack.pop();
3153
3154	if (node->IsLeaf())
3155	{
3156	if ( (!onlyUnmailed \|\| !node->Mailed()) )
3157	return dynamic_cast<BspLeaf *>(node);
3158	}
3159	else
3160	{
3161	BspInterior interior = dynamic_cast<BspInterior >(node);
3162
3163	// random decision
3164	if (mask & 1)
3165	nodeStack.push(interior->GetBack());
3166	else
3167	nodeStack.push(interior->GetFront());
3168
3169	mask = mask >> 1;
3170	}
3171	}
3172
3173	return NULL;
3174	}
3175
3176
3177	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
3178	{
3179	int pvsSize = 0;
3180
3181	RayInfoContainer::const_iterator rit, rit_end = rays.end();
3182
3183	Intersectable::NewMail();
3184
3185	for (rit = rays.begin(); rit != rays.end(); ++ rit)
3186	{
3187	VssRay ray = (rit).mRay;
3188
3189	if (ray->mOriginObject)
3190	{
3191	if (!ray->mOriginObject->Mailed())
3192	{
3193	ray->mOriginObject->Mail();
3194	++ pvsSize;
3195	}
3196	}
3197	if (ray->mTerminationObject)
3198	{
3199	if (!ray->mTerminationObject->Mailed())
3200	{
3201	ray->mTerminationObject->Mail();
3202	++ pvsSize;
3203	}
3204	}
3205	}
3206
3207	return pvsSize;
3208	}
3209
3210
3211	float VspBspTree::GetEpsilon() const
3212	{
3213	return mEpsilon;
3214	}
3215
3216
3217	int VspBspTree::SplitPolygons(const Plane3 &plane,
3218	PolygonContainer &polys,
3219	PolygonContainer &frontPolys,
3220	PolygonContainer &backPolys,
3221	PolygonContainer &coincident) const
3222	{
3223	int splits = 0;
3224
3225	PolygonContainer::const_iterator it, it_end = polys.end();
3226
3227	for (it = polys.begin(); it != polys.end(); ++ it)
3228	{
3229	Polygon3 poly = it;
3230
3231	// classify polygon
3232	const int cf = poly->ClassifyPlane(plane, mEpsilon);
3233
3234	switch (cf)
3235	{
3236	case Polygon3::COINCIDENT:
3237	coincident.push_back(poly);
3238	break;
3239	case Polygon3::FRONT_SIDE:
3240	frontPolys.push_back(poly);
3241	break;
3242	case Polygon3::BACK_SIDE:
3243	backPolys.push_back(poly);
3244	break;
3245	case Polygon3::SPLIT:
3246	backPolys.push_back(poly);
3247	frontPolys.push_back(poly);
3248	++ splits;
3249	break;
3250	default:
3251	Debug << "SHOULD NEVER COME HERE\n";
3252	break;
3253	}
3254	}
3255
3256	return splits;
3257	}
3258
3259
3260	int VspBspTree::CastLineSegment(const Vector3 &origin,
3261	const Vector3 &termination,
3262	ViewCellContainer &viewcells)
3263	{
3264	int hits = 0;
3265	stack<BspRayTraversalData> tStack;
3266
3267	float mint = 0.0f, maxt = 1.0f;
3268
3269	Intersectable::NewMail();
3270	ViewCell::NewMail();
3271
3272	Vector3 entp = origin;
3273	Vector3 extp = termination;
3274
3275	BspNode *node = mRoot;
3276	BspNode *farChild = NULL;
3277
3278	float t;
3279	const float thresh = 1e-6f; // matt: change this to adjustable value
3280
3281	while (1)
3282	{
3283	if (!node->IsLeaf())
3284	{
3285	BspInterior in = dynamic_cast<BspInterior >(node);
3286
3287	Plane3 splitPlane = in->GetPlane();
3288
3289	const int entSide = splitPlane.Side(entp, thresh);
3290	const int extSide = splitPlane.Side(extp, thresh);
3291
3292	if (entSide < 0)
3293	{
3294	node = in->GetBack();
3295
3296	// plane does not split ray => no far child
3297	if (extSide <= 0)
3298	continue;
3299
3300	farChild = in->GetFront(); // plane splits ray
3301	}
3302	else if (entSide > 0)
3303	{
3304	node = in->GetFront();
3305
3306	if (extSide >= 0) // plane does not split ray => no far child
3307	continue;
3308
3309	farChild = in->GetBack(); // plane splits ray
3310	}
3311	else // one of the ray end points is on the plane
3312	{ // NOTE: what to do if ray is coincident with plane?
3313	if (extSide < 0)
3314	node = in->GetBack();
3315	else //if (extSide > 0)
3316	node = in->GetFront();
3317	//else break; // coincident => count no intersections
3318
3319	continue; // no far child
3320	}
3321
3322	// push data for far child
3323	tStack.push(BspRayTraversalData(farChild, extp));
3324
3325	// find intersection of ray segment with plane
3326	extp = splitPlane.FindIntersection(origin, extp, &t);
3327	}
3328	else
3329	{
3330	// reached leaf => intersection with view cell
3331	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3332	ViewCell *viewCell;
3333
3334	if (0)
3335	viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3336	else
3337	viewCell = leaf->GetViewCell();
3338
3339	if (!viewCell->Mailed())
3340	{
3341	viewcells.push_back(viewCell);
3342	viewCell->Mail();
3343	++ hits;
3344	}
3345
3346	//-- fetch the next far child from the stack
3347	if (tStack.empty())
3348	break;
3349
3350	entp = extp;
3351
3352	const BspRayTraversalData &s = tStack.top();
3353
3354	node = s.mNode;
3355	extp = s.mExitPoint;
3356
3357	tStack.pop();
3358	}
3359	}
3360
3361	return hits;
3362	}
3363
3364
3365
3366
3367	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
3368	{
3369	std::deque<BspNode *> path1;
3370	BspNode *p1 = n1;
3371
3372	// create path from node 1 to root
3373	while (p1)
3374	{
3375	if (p1 == n2) // second node on path
3376	return (int)path1.size();
3377
3378	path1.push_front(p1);
3379	p1 = p1->GetParent();
3380	}
3381
3382	int depth = n2->GetDepth();
3383	int d = depth;
3384
3385	BspNode *p2 = n2;
3386
3387	// compare with same depth
3388	while (1)
3389	{
3390	if ((d < (int)path1.size()) && (p2 == path1[d]))
3391	return (depth - d) + ((int)path1.size() - 1 - d);
3392
3393	-- d;
3394	p2 = p2->GetParent();
3395	}
3396
3397	return 0; // never come here
3398	}
3399
3400
3401	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
3402	{
3403	// TODO
3404	#if HAS_TO_BE_REDONE
3405	if (node->IsLeaf())
3406	return node;
3407
3408	BspInterior interior = dynamic_cast<BspInterior >(node);
3409
3410	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
3411	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
3412
3413	if (front->IsLeaf() && back->IsLeaf())
3414	{
3415	BspLeaf frontLeaf = dynamic_cast<BspLeaf >(front);
3416	BspLeaf backLeaf = dynamic_cast<BspLeaf >(back);
3417
3418	//-- collapse tree
3419	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
3420	{
3421	BspViewCell *vc = frontLeaf->GetViewCell();
3422
3423	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
3424	leaf->SetTreeValid(frontLeaf->TreeValid());
3425
3426	// replace a link from node's parent
3427	if (leaf->GetParent())
3428	leaf->GetParent()->ReplaceChildLink(node, leaf);
3429	else
3430	mRoot = leaf;
3431
3432	++ collapsed;
3433	delete interior;
3434
3435	return leaf;
3436	}
3437	}
3438	#endif
3439	return node;
3440	}
3441
3442
3443	int VspBspTree::CollapseTree()
3444	{
3445	int collapsed = 0;
3446	//TODO
3447	#if HAS_TO_BE_REDONE
3448	(void)CollapseTree(mRoot, collapsed);
3449
3450	// revalidate leaves
3451	RepairViewCellsLeafLists();
3452	#endif
3453	return collapsed;
3454	}
3455
3456
3457	void VspBspTree::RepairViewCellsLeafLists()
3458	{
3459	// TODO
3460	#if HAS_TO_BE_REDONE
3461	// list not valid anymore => clear
3462	stack<BspNode *> nodeStack;
3463	nodeStack.push(mRoot);
3464
3465	ViewCell::NewMail();
3466
3467	while (!nodeStack.empty())
3468	{
3469	BspNode *node = nodeStack.top();
3470	nodeStack.pop();
3471
3472	if (node->IsLeaf())
3473	{
3474	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3475
3476	BspViewCell *viewCell = leaf->GetViewCell();
3477
3478	if (!viewCell->Mailed())
3479	{
3480	viewCell->mLeaves.clear();
3481	viewCell->Mail();
3482	}
3483
3484	viewCell->mLeaves.push_back(leaf);
3485
3486	}
3487	else
3488	{
3489	BspInterior interior = dynamic_cast<BspInterior >(node);
3490
3491	nodeStack.push(interior->GetFront());
3492	nodeStack.push(interior->GetBack());
3493	}
3494	}
3495	// TODO
3496	#endif
3497	}
3498
3499
3500	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
3501
3502
3503	int VspBspTree::CastBeam(Beam &beam)
3504	{
3505	stack<bspNodePair> nodeStack;
3506	BspNodeGeometry *rgeom = new BspNodeGeometry();
3507	ConstructGeometry(mRoot, *rgeom);
3508
3509	nodeStack.push(bspNodePair(mRoot, rgeom));
3510
3511	ViewCell::NewMail();
3512
3513	while (!nodeStack.empty())
3514	{
3515	BspNode *node = nodeStack.top().first;
3516	BspNodeGeometry *geom = nodeStack.top().second;
3517	nodeStack.pop();
3518
3519	AxisAlignedBox3 box;
3520	geom->GetBoundingBox(box);
3521
3522	const int side = beam.ComputeIntersection(box);
3523
3524	switch (side)
3525	{
3526	case -1:
3527	CollectViewCells(node, true, beam.mViewCells, true);
3528	break;
3529	case 0:
3530
3531	if (node->IsLeaf())
3532	{
3533	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3534
3535	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
3536	{
3537	leaf->GetViewCell()->Mail();
3538	beam.mViewCells.push_back(leaf->GetViewCell());
3539	}
3540	}
3541	else
3542	{
3543	BspInterior interior = dynamic_cast<BspInterior >(node);
3544
3545	BspNode *first = interior->GetFront();
3546	BspNode *second = interior->GetBack();
3547
3548	BspNodeGeometry *firstGeom = new BspNodeGeometry();
3549	BspNodeGeometry *secondGeom = new BspNodeGeometry();
3550
3551	geom->SplitGeometry(*firstGeom,
3552	*secondGeom,
3553	interior->GetPlane(),
3554	mBox,
3555	//0.0000001f);
3556	mEpsilon);
3557
3558	// decide on the order of the nodes
3559	if (DotProd(beam.mPlanes[0].mNormal,
3560	interior->GetPlane().mNormal) > 0)
3561	{
3562	swap(first, second);
3563	swap(firstGeom, secondGeom);
3564	}
3565
3566	nodeStack.push(bspNodePair(first, firstGeom));
3567	nodeStack.push(bspNodePair(second, secondGeom));
3568	}
3569
3570	break;
3571	default:
3572	// default: cull
3573	break;
3574	}
3575
3576	DEL_PTR(geom);
3577
3578	}
3579
3580	return (int)beam.mViewCells.size();
3581	}
3582
3583
3584	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
3585	{
3586	mViewCellsManager = vcm;
3587	}
3588
3589
3590	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
3591	vector<MergeCandidate> &candidates)
3592	{
3593	BspLeaf::NewMail();
3594
3595	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
3596
3597	int numCandidates = 0;
3598
3599	// find merge candidates and push them into queue
3600	for (it = leaves.begin(); it != it_end; ++ it)
3601	{
3602	BspLeaf leaf = it;
3603
3604	// the same leaves must not be part of two merge candidates
3605	leaf->Mail();
3606
3607	vector<BspLeaf *> neighbors;
3608
3609	// appoximate neighbor search has slightl relaxed constraints
3610	if (1)
3611	FindNeighbors(leaf, neighbors, true);
3612	else
3613	FindApproximateNeighbors(leaf, neighbors, true);
3614
3615	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
3616
3617	// TODO: test if at least one ray goes from one leaf to the other
3618	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
3619	{
3620	if ((*nit)->GetViewCell() != leaf->GetViewCell())
3621	{
3622	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
3623
3624	// dont't merge view cells if they are empty and not front and back leaf of the same parent
3625	// in the tree?
3626	if (mEmptyViewCellsMergeAllowed \|\|
3627	!leaf->GetViewCell()->GetPvs().Empty() \|\|
3628	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
3629	leaf->IsSibling(*nit))
3630	{
3631	candidates.push_back(mc);
3632	}
3633
3634	++ numCandidates;
3635	if ((numCandidates % 1000) == 0)
3636	{
3637	cout << "collected " << numCandidates << " merge candidates" << endl;
3638	}
3639	}
3640	}
3641	}
3642
3643	Debug << "merge queue: " << (int)candidates.size() << endl;
3644	Debug << "leaves in queue: " << numCandidates << endl;
3645
3646
3647	return (int)leaves.size();
3648	}
3649
3650
3651	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
3652	vector<MergeCandidate> &candidates)
3653	{
3654	ViewCell::NewMail();
3655	long startTime = GetTime();
3656
3657	map<BspLeaf , vector<BspLeaf> > neighborMap;
3658	ViewCellContainer::const_iterator iit;
3659
3660	int numLeaves = 0;
3661
3662	BspLeaf::NewMail();
3663
3664	for (int i = 0; i < (int)rays.size(); ++ i)
3665	{
3666	VssRay *ray = rays[i];
3667
3668	// traverse leaves stored in the rays and compare and
3669	// merge consecutive leaves (i.e., the neighbors in the tree)
3670	if (ray->mViewCells.size() < 2)
3671	continue;
3672	//TODO viewcellhierarchy
3673	iit = ray->mViewCells.begin();
3674	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
3675	BspLeaf *leaf = bspVc->mLeaf;
3676
3677	// traverse intersections
3678	// consecutive leaves are neighbors => add them to queue
3679	for (; iit != ray->mViewCells.end(); ++ iit)
3680	{
3681	// next pair
3682	BspLeaf *prevLeaf = leaf;
3683	bspVc = dynamic_cast<BspViewCell >(iit);
3684	leaf = bspVc->mLeaf;
3685
3686	// view space not valid or same view cell
3687	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3688	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3689	continue;
3690
3691	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3692
3693	bool found = false;
3694
3695	// both leaves inserted in queue already =>
3696	// look if double pair already exists
3697	if (leaf->Mailed() && prevLeaf->Mailed())
3698	{
3699	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3700
3701	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3702	if (*it == prevLeaf)
3703	found = true; // already in queue
3704	}
3705
3706	if (!found)
3707	{
3708	// this pair is not in map yet
3709	// => insert into the neighbor map and the queue
3710	neighbors.push_back(prevLeaf);
3711	neighborMap[prevLeaf].push_back(leaf);
3712
3713	leaf->Mail();
3714	prevLeaf->Mail();
3715
3716	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3717
3718	candidates.push_back(mc);
3719
3720	if (((int)candidates.size() % 1000) == 0)
3721	{
3722	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3723	}
3724	}
3725	}
3726	}
3727
3728	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3729	Debug << "merge queue: " << (int)candidates.size() << endl;
3730	Debug << "leaves in queue: " << numLeaves << endl;
3731
3732
3733	//-- collect the leaves which haven't been found by ray casting
3734	if (0)
3735	{
3736	cout << "finding additional merge candidates using geometry" << endl;
3737	vector<BspLeaf *> leaves;
3738	CollectLeaves(leaves, true);
3739	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3740	CollectMergeCandidates(leaves, candidates);
3741	}
3742
3743	return numLeaves;
3744	}
3745
3746
3747
3748
3749	ViewCell *VspBspTree::GetViewCell(const Vector3 &point, const bool active)
3750	{
3751	if (mRoot == NULL)
3752	return NULL;
3753
3754	stack<BspNode *> nodeStack;
3755	nodeStack.push(mRoot);
3756
3757	ViewCellLeaf *viewcell = NULL;
3758
3759	while (!nodeStack.empty())
3760	{
3761	BspNode *node = nodeStack.top();
3762	nodeStack.pop();
3763
3764	if (node->IsLeaf())
3765	{
3766	viewcell = dynamic_cast<BspLeaf *>(node)->GetViewCell();
3767	break;
3768	}
3769	else
3770	{
3771	BspInterior interior = dynamic_cast<BspInterior >(node);
3772
3773	// random decision
3774	if (interior->GetPlane().Side(point) < 0)
3775	nodeStack.push(interior->GetBack());
3776	else
3777	nodeStack.push(interior->GetFront());
3778	}
3779	}
3780
3781	if (active)
3782	return mViewCellsTree->GetActiveViewCell(viewcell);
3783	else
3784	return viewcell;
3785	}
3786
3787
3788	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
3789	{
3790	BspNode *node = mRoot;
3791
3792	while (1)
3793	{
3794	// early exit
3795	if (node->TreeValid())
3796	return true;
3797
3798	if (node->IsLeaf())
3799	return false;
3800
3801	BspInterior in = dynamic_cast<BspInterior >(node);
3802
3803	if (in->GetPlane().Side(viewPoint) <= 0)
3804	{
3805	node = in->GetBack();
3806	}
3807	else
3808	{
3809	node = in->GetFront();
3810	}
3811	}
3812
3813	// should never come here
3814	return false;
3815	}
3816
3817
3818	void VspBspTree::PropagateUpValidity(BspNode *node)
3819	{
3820	const bool isValid = node->TreeValid();
3821
3822	// propagative up invalid flag until only invalid nodes exist over this node
3823	if (!isValid)
3824	{
3825	while (!node->IsRoot() && node->GetParent()->TreeValid())
3826	{
3827	node = node->GetParent();
3828	node->SetTreeValid(false);
3829	}
3830	}
3831	else
3832	{
3833	// propagative up valid flag until one of the subtrees is invalid
3834	while (!node->IsRoot() && !node->TreeValid())
3835	{
3836	node = node->GetParent();
3837	BspInterior interior = dynamic_cast<BspInterior >(node);
3838
3839	// the parent is valid iff both leaves are valid
3840	node->SetTreeValid(interior->GetBack()->TreeValid() &&
3841	interior->GetFront()->TreeValid());
3842	}
3843	}
3844	}
3845
3846
3847	bool VspBspTree::Export(ofstream &stream)
3848	//bool VspBspTree::Export(ogzstream &stream)
3849	{
3850	ExportNode(mRoot, stream);
3851
3852	return true;
3853	}
3854
3855
3856	void VspBspTree::ExportNode(BspNode *node, ofstream &stream)
3857	//void VspBspTree::ExportNode(BspNode *node, ogzstream &stream)
3858	{
3859	if (node->IsLeaf())
3860	{
3861	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3862	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3863
3864	int id = -1;
3865	if (viewCell != mOutOfBoundsCell)
3866	id = viewCell->GetId();
3867
3868	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
3869	}
3870	else
3871	{
3872	BspInterior interior = dynamic_cast<BspInterior >(node);
3873
3874	Plane3 plane = interior->GetPlane();
3875	stream << "<Interior plane=\"" << plane.mNormal.x << " "
3876	<< plane.mNormal.y << " " << plane.mNormal.z << " "
3877	<< plane.mD << "\">" << endl;
3878
3879	ExportNode(interior->GetBack(), stream);
3880	ExportNode(interior->GetFront(), stream);
3881
3882	stream << "</Interior>" << endl;
3883	}
3884	}
3885
3886	}

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