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source: GTP/trunk/Lib/Vis/Preprocessing/src/FromPointVisibilityTree.cpp @ 860

Revision 860, 96.4 KB checked in by mattausch, 18 years ago (diff)

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1	#include <stack>
2	#include <time.h>
3	#include <iomanip>
4
5	#include "Plane3.h"
6	#include "FromPointVisibilityTree.h"
7	#include "Mesh.h"
8	#include "common.h"
9	#include "ViewCell.h"
10	#include "Environment.h"
11	#include "Polygon3.h"
12	#include "Ray.h"
13	#include "AxisAlignedBox3.h"
14	#include "Exporter.h"
15	#include "Plane3.h"
16	#include "ViewCellBsp.h"
17	#include "ViewCellsManager.h"
18	#include "Beam.h"
19
20	using namespace GtpVisibilityPreprocessor {
21
22	#define USE_FIXEDPOINT_T 0
23
24
25	//-- static members
26
27
28	int FromPointVisibilityTree::sFrontId = 0;
29	int FromPointVisibilityTree::sBackId = 0;
30	int FromPointVisibilityTree::sFrontAndBackId = 0;
31
32	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
33
34
35	// pvs penalty can be different from pvs size
36	inline float EvalPvsPenalty(const int pvs,
37	const int lower,
38	const int upper)
39	{
40	// clamp to minmax values
41	if (pvs < lower)
42	return (float)lower;
43	if (pvs > upper)
44	return (float)upper;
45
46	return (float)pvs;
47	}
48
49
50
51
52	/******************************************************************************/
53	/* class FromPointVisibilityTree implementation */
54	/******************************************************************************/
55
56
57	FromPointVisibilityTree::FromPointVisibilityTree():
58	mRoot(NULL),
59	mUseAreaForPvs(false),
60	mCostNormalizer(Limits::Small),
61	mViewCellsManager(NULL),
62	mOutOfBoundsCell(NULL),
63	mStoreRays(false),
64	mRenderCostWeight(0.5),
65	mUseRandomAxis(false),
66	mTimeStamp(1)
67	{
68	bool randomize = false;
69	environment->GetBoolValue("FromPointVisibilityTree.Construction.randomize", randomize);
70	if (randomize)
71	Randomize(); // initialise random generator for heuristics
72
73	//-- termination criteria for autopartition
74	environment->GetIntValue("FromPointVisibilityTree.Termination.maxDepth", mTermMaxDepth);
75	environment->GetIntValue("FromPointVisibilityTree.Termination.minPvs", mTermMinPvs);
76	environment->GetIntValue("FromPointVisibilityTree.Termination.minRays", mTermMinRays);
77	environment->GetFloatValue("FromPointVisibilityTree.Termination.minProbability", mTermMinProbability);
78	environment->GetFloatValue("FromPointVisibilityTree.Termination.maxRayContribution", mTermMaxRayContribution);
79	environment->GetFloatValue("FromPointVisibilityTree.Termination.minAccRayLenght", mTermMinAccRayLength);
80	environment->GetFloatValue("FromPointVisibilityTree.Termination.maxCostRatio", mTermMaxCostRatio);
81	environment->GetIntValue("FromPointVisibilityTree.Termination.missTolerance", mTermMissTolerance);
82	environment->GetIntValue("FromPointVisibilityTree.Termination.maxViewCells", mMaxViewCells);
83
84	//-- max cost ratio for early tree termination
85	environment->GetFloatValue("FromPointVisibilityTree.Termination.maxCostRatio", mTermMaxCostRatio);
86
87	environment->GetFloatValue("FromPointVisibilityTree.Termination.minGlobalCostRatio", mTermMinGlobalCostRatio);
88	environment->GetIntValue("FromPointVisibilityTree.Termination.globalCostMissTolerance", mTermGlobalCostMissTolerance);
89
90	// HACK//mTermMinPolygons = 25;
91
92	//-- factors for bsp tree split plane heuristics
93	environment->GetFloatValue("FromPointVisibilityTree.Factor.pvs", mPvsFactor);
94	environment->GetFloatValue("FromPointVisibilityTree.Termination.ct_div_ci", mCtDivCi);
95
96
97	//-- partition criteria
98	environment->GetIntValue("FromPointVisibilityTree.maxPolyCandidates", mMaxPolyCandidates);
99	environment->GetIntValue("FromPointVisibilityTree.maxRayCandidates", mMaxRayCandidates);
100	environment->GetIntValue("FromPointVisibilityTree.splitPlaneStrategy", mSplitPlaneStrategy);
101
102	environment->GetFloatValue("FromPointVisibilityTree.Construction.epsilon", mEpsilon);
103	environment->GetIntValue("FromPointVisibilityTree.maxTests", mMaxTests);
104
105	// if only the driving axis is used for axis aligned split
106	environment->GetBoolValue("FromPointVisibilityTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
107
108	//-- termination criteria for axis aligned split
109	environment->GetFloatValue("FromPointVisibilityTree.Termination.AxisAligned.maxRayContribution",
110	mTermMaxRayContriForAxisAligned);
111	environment->GetIntValue("FromPointVisibilityTree.Termination.AxisAligned.minRays",
112	mTermMinRaysForAxisAligned);
113
114	//environment->GetFloatValue("FromPointVisibilityTree.maxTotalMemory", mMaxTotalMemory);
115	environment->GetFloatValue("FromPointVisibilityTree.maxStaticMemory", mMaxMemory);
116
117	environment->GetFloatValue("FromPointVisibilityTree.Construction.renderCostWeight", mRenderCostWeight);
118	environment->GetBoolValue("FromPointVisibilityTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
119
120	environment->GetBoolValue("FromPointVisibilityTree.useCostHeuristics", mUseCostHeuristics);
121	environment->GetBoolValue("FromPointVisibilityTree.useSplitCostQueue", mUseSplitCostQueue);
122	environment->GetBoolValue("FromPointVisibilityTree.simulateOctree", mCirculatingAxis);
123	environment->GetBoolValue("FromPointVisibilityTree.useRandomAxis", mUseRandomAxis);
124	environment->GetIntValue("FromPointVisibilityTree.nodePriorityQueueType", mNodePriorityQueueType);
125
126	environment->GetBoolValue("ViewCells.PostProcess.emptyViewCellsMerge", mEmptyViewCellsMergeAllowed);
127
128	char subdivisionStatsLog[100];
129	environment->GetStringValue("FromPointVisibilityTree.subdivisionStats", subdivisionStatsLog);
130	mSubdivisionStats.open(subdivisionStatsLog);
131
132	environment->GetFloatValue("FromPointVisibilityTree.Construction.minBand", mMinBand);
133	environment->GetFloatValue("FromPointVisibilityTree.Construction.maxBand", mMaxBand);
134
135	//-- debug output
136
137	Debug << "***** VSP BSP options ****** " << endl;
138	Debug << "max depth: " << mTermMaxDepth << endl;
139	Debug << "min PVS: " << mTermMinPvs << endl;
140	Debug << "min probabiliy: " << mTermMinProbability << endl;
141	Debug << "min rays: " << mTermMinRays << endl;
142	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
143	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
144	Debug << "miss tolerance: " << mTermMissTolerance << endl;
145	Debug << "max view cells: " << mMaxViewCells << endl;
146	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
147	//Debug << "max plane candidates: " << mMaxRayCandidates << endl;
148	Debug << "randomize: " << randomize << endl;
149
150	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
151	Debug << "render cost weight: " << mRenderCostWeight << endl;
152	Debug << "min global cost ratio: " << mTermMinGlobalCostRatio << endl;
153	Debug << "global cost miss tolerance: " << mTermGlobalCostMissTolerance << endl;
154	Debug << "only driving axis: " << mOnlyDrivingAxis << endl;
155	Debug << "max memory: " << mMaxMemory << endl;
156	Debug << "use poly split if available: " << mUsePolygonSplitIfAvailable << endl;
157	Debug << "use cost heuristics: " << mUseCostHeuristics << endl;
158	Debug << "use split cost queue: " << mUseSplitCostQueue << endl;
159	Debug << "subdivision stats log: " << subdivisionStatsLog << endl;
160	Debug << "use random axis: " << mUseRandomAxis << endl;
161	Debug << "priority queue type: " << mNodePriorityQueueType << endl;
162	Debug << "empty view cells merge: " << mEmptyViewCellsMergeAllowed << endl;
163	Debug << "octree: " << mCirculatingAxis << endl;
164	Debug << "minband: " << mMinBand << endl;
165	Debug << "maxband: " << mMaxBand << endl;
166
167
168	Debug << "Split plane strategy: ";
169
170	if (mSplitPlaneStrategy & RANDOM_POLYGON)
171	{
172	Debug << "random polygon ";
173	}
174	if (mSplitPlaneStrategy & AXIS_ALIGNED)
175	{
176	Debug << "axis aligned ";
177	}
178	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
179	{
180	mCostNormalizer += mLeastRaySplitsFactor;
181	Debug << "least ray splits ";
182	}
183	if (mSplitPlaneStrategy & BALANCED_RAYS)
184	{
185	mCostNormalizer += mBalancedRaysFactor;
186	Debug << "balanced rays ";
187	}
188	if (mSplitPlaneStrategy & PVS)
189	{
190	mCostNormalizer += mPvsFactor;
191	Debug << "pvs";
192	}
193
194
195	mSplitCandidates = new vector<SortableEntry>;
196
197	Debug << endl;
198	}
199
200
201	BspViewCell *FromPointVisibilityTree::GetOutOfBoundsCell()
202	{
203	return mOutOfBoundsCell;
204	}
205
206
207	BspViewCell *FromPointVisibilityTree::GetOrCreateOutOfBoundsCell()
208	{
209	if (!mOutOfBoundsCell)
210	{
211	mOutOfBoundsCell = new BspViewCell();
212	mOutOfBoundsCell->SetId(-1);
213	mOutOfBoundsCell->SetValid(false);
214	}
215
216	return mOutOfBoundsCell;
217	}
218
219
220	const BspTreeStatistics &FromPointVisibilityTree::GetStatistics() const
221	{
222	return mBspStats;
223	}
224
225
226	FromPointVisibilityTree::~FromPointVisibilityTree()
227	{
228	DEL_PTR(mRoot);
229	DEL_PTR(mSplitCandidates);
230	}
231
232
233	int FromPointVisibilityTree::AddMeshToPolygons(Mesh *mesh,
234	PolygonContainer &polys,
235	MeshInstance *parent)
236	{
237	FaceContainer::const_iterator fi;
238
239	// copy the face data to polygons
240	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
241	{
242	Polygon3 poly = new Polygon3((fi), mesh);
243
244	if (poly->Valid(mEpsilon))
245	{
246	poly->mParent = parent; // set parent intersectable
247	polys.push_back(poly);
248	}
249	else
250	DEL_PTR(poly);
251	}
252	return (int)mesh->mFaces.size();
253	}
254
255
256	int FromPointVisibilityTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
257	PolygonContainer &polys,
258	int maxObjects)
259	{
260	int limit = (maxObjects > 0) ?
261	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
262
263	int polysSize = 0;
264
265	for (int i = 0; i < limit; ++ i)
266	{
267	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
268	{
269	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
270	polysSize +=
271	AddMeshToPolygons(viewCells[i]->GetMesh(),
272	polys,
273	viewCells[i]);
274	}
275	}
276
277	return polysSize;
278	}
279
280
281	int FromPointVisibilityTree::AddToPolygonSoup(const ObjectContainer &objects,
282	PolygonContainer &polys,
283	int maxObjects)
284	{
285	int limit = (maxObjects > 0) ?
286	Min((int)objects.size(), maxObjects) : (int)objects.size();
287
288	for (int i = 0; i < limit; ++i)
289	{
290	Intersectable object = objects[i];//it;
291	Mesh *mesh = NULL;
292
293	switch (object->Type()) // extract the meshes
294	{
295	case Intersectable::MESH_INSTANCE:
296	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
297	break;
298	case Intersectable::VIEW_CELL:
299	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
300	break;
301	// TODO: handle transformed mesh instances
302	default:
303	Debug << "intersectable type not supported" << endl;
304	break;
305	}
306
307	if (mesh) // copy the mesh data to polygons
308	{
309	mBox.Include(object->GetBox()); // add to BSP tree aabb
310	AddMeshToPolygons(mesh, polys, NULL);
311	}
312	}
313
314	return (int)polys.size();
315	}
316
317
318	void FromPointVisibilityTree::Construct(const VssRayContainer &sampleRays,
319	AxisAlignedBox3 *forcedBoundingBox)
320	{
321	mBspStats.nodes = 1;
322	mBox.Initialize(); // initialise BSP tree bounding box
323
324	if (forcedBoundingBox)
325	mBox = *forcedBoundingBox;
326
327	PolygonContainer polys;
328	RayInfoContainer *rays = new RayInfoContainer();
329
330	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
331
332	long startTime = GetTime();
333
334	cout << "Extracting polygons from rays ... ";
335
336	Intersectable::NewMail();
337
338	int numObj = 0;
339
340	//-- extract polygons intersected by the rays
341	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
342	{
343	VssRay ray = rit;
344
345	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
346	ray->mTerminationObject &&
347	!ray->mTerminationObject->Mailed())
348	{
349	ray->mTerminationObject->Mail();
350	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
351	AddMeshToPolygons(obj->GetMesh(), polys, obj);
352	++ numObj;
353
354	//-- compute bounding box
355	if (!forcedBoundingBox)
356	mBox.Include(ray->mTermination);
357	}
358
359	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
360	ray->mOriginObject &&
361	!ray->mOriginObject->Mailed())
362	{
363	ray->mOriginObject->Mail();
364	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
365	AddMeshToPolygons(obj->GetMesh(), polys, obj);
366	++ numObj;
367
368	//-- compute bounding box
369	if (!forcedBoundingBox)
370	mBox.Include(ray->mOrigin);
371	}
372	}
373
374	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
375	<< mViewCellsManager->GetMaxPvsSize() << endl;
376
377	//-- store rays
378	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
379	{
380	VssRay ray = rit;
381
382	float minT, maxT;
383
384	static Ray hray;
385	hray.Init(*ray);
386
387	// TODO: not very efficient to implictly cast between rays types
388	if (mBox.GetRaySegment(hray, minT, maxT))
389	{
390	float len = ray->Length();
391
392	if (!len)
393	len = Limits::Small;
394
395	rays->push_back(RayInfo(ray, minT / len, maxT / len));
396	}
397	}
398
399	// normalize
400	if (mUseAreaForPvs)
401	mTermMinProbability *= mBox.SurfaceArea();
402	else
403	mTermMinProbability *= mBox.GetVolume();
404
405	// throw out unnecessary polygons
406	PreprocessPolygons(polys);
407
408	mBspStats.polys = (int)polys.size();
409	mGlobalCostMisses = 0;
410
411	cout << "finished" << endl;
412
413	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
414	<< (int)sampleRays.size() << " rays in "
415	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
416
417	// use split cost priority queue
418	if (mUseSplitCostQueue)
419	{
420	ConstructWithSplitQueue(polys, rays);
421	}
422	else
423	{
424	Construct(polys, rays);
425	}
426
427	// clean up polygons
428	CLEAR_CONTAINER(polys);
429	}
430
431
432	// TODO: return memory usage in MB
433	float FromPointVisibilityTree::GetMemUsage() const
434	{
435	return (float)
436	(sizeof(FromPointVisibilityTree) +
437	mBspStats.Leaves() * sizeof(BspLeaf) +
438	mCreatedViewCells * sizeof(BspViewCell) +
439	mBspStats.pvs * sizeof(ObjectPvsData) +
440	mBspStats.Interior() * sizeof(BspInterior) +
441	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
442	}
443
444
445
446	void FromPointVisibilityTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
447	{
448	VspBspTraversalQueue tQueue;
449
450	mRoot = new BspLeaf();
451
452	// constrruct root node geometry
453	BspNodeGeometry *geom = new BspNodeGeometry();
454	ConstructGeometry(mRoot, *geom);
455
456	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
457
458	VspBspTraversalData tData(mRoot,
459	new PolygonContainer(polys),
460	0,
461	rays,
462	ComputePvsSize(*rays),
463	prop,
464	geom);
465
466	EvalPriority(tData);
467
468
469	// first node is kd node, i.e. an axis aligned box
470	if (1)
471	tData.mIsKdNode = true;
472	else
473	tData.mIsKdNode = false;
474
475	tQueue.push(tData);
476
477
478	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
479	mTotalPvsSize = tData.mPvs;
480
481	mSubdivisionStats
482	<< "#ViewCells\n1" << endl
483	<< "#RenderCostDecrease\n0" << endl
484	<< "#TotalRenderCost\n" << mTotalCost << endl
485	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
486
487	Debug << "total cost: " << mTotalCost << endl;
488
489
490	mBspStats.Start();
491	cout << "Constructing vsp bsp tree ... \n";
492
493	long startTime = GetTime();
494	int nLeaves = 500;
495	int nViewCells = 500;
496
497	// used for intermediate time measurements and progress
498	long interTime = GetTime();
499
500	mOutOfMemory = false;
501
502	mCreatedViewCells = 0;
503
504	while (!tQueue.empty())
505	{
506	tData = tQueue.top();
507	tQueue.pop();
508
509	if (0 && !mOutOfMemory)
510	{
511	float mem = GetMemUsage();
512
513	if (mem > mMaxMemory)
514	{
515	mOutOfMemory = true;
516	Debug << "memory limit reached: " << mem << endl;
517	}
518	}
519
520	// subdivide leaf node
521	BspNode *r = Subdivide(tQueue, tData);
522
523	if (r == mRoot)
524	Debug << "VSP BSP tree construction time spent at root: "
525	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
526
527	if (mBspStats.Leaves() >= nLeaves)
528	{
529	nLeaves += 500;
530
531	cout << "leaves=" << mBspStats.Leaves() << endl;
532	Debug << "needed "
533	<< TimeDiff(interTime, GetTime())*1e-3
534	<< " secs to create 500 view cells" << endl;
535	interTime = GetTime();
536	}
537
538	if (mCreatedViewCells >= nViewCells)
539	{
540	nViewCells += 500;
541
542	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
543	}
544	}
545
546	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
547	cout << "finished\n";
548
549	mBspStats.Stop();
550	}
551
552
553
554	void FromPointVisibilityTree::ConstructWithSplitQueue(const PolygonContainer &polys,
555	RayInfoContainer *rays)
556	{
557	VspBspSplitQueue tQueue;
558
559	mRoot = new BspLeaf();
560
561	// constrruct root node geometry
562	BspNodeGeometry *geom = new BspNodeGeometry();
563	ConstructGeometry(mRoot, *geom);
564
565	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
566
567	VspBspTraversalData tData(mRoot,
568	new PolygonContainer(polys),
569	0,
570	rays,
571	ComputePvsSize(*rays),
572	prop,
573	geom);
574
575
576	// compute first split candidate
577	VspBspSplitCandidate splitCandidate;
578	EvalSplitCandidate(tData, splitCandidate);
579
580	tQueue.push(splitCandidate);
581
582	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
583	mTotalPvsSize = tData.mPvs;
584
585	mSubdivisionStats
586	<< "#ViewCells\n1\n" << endl
587	<< "#RenderCostDecrease\n0\n" << endl
588	<< "#SplitCandidateCost\n0\n" << endl
589	<< "#TotalRenderCost\n" << mTotalCost << endl
590	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
591
592	Debug << "total cost: " << mTotalCost << endl;
593
594
595	mBspStats.Start();
596	cout << "Constructing vsp bsp tree ... \n";
597
598	long startTime = GetTime();
599	int nLeaves = 500;
600	int nViewCells = 500;
601
602	// used for intermediate time measurements and progress
603	long interTime = GetTime();
604
605	mOutOfMemory = false;
606
607	mCreatedViewCells = 0;
608
609	while (!tQueue.empty())
610	{
611	splitCandidate = tQueue.top();
612	tQueue.pop();
613
614	// cost ratio of cost decrease / totalCost
615	float costRatio = splitCandidate.GetCost() / mTotalCost;
616
617	//Debug << "cost ratio: " << costRatio << endl;
618
619	if (costRatio < mTermMinGlobalCostRatio)
620	++ mGlobalCostMisses;
621
622	if (0 && !mOutOfMemory)
623	{
624	float mem = GetMemUsage();
625
626	if (mem > mMaxMemory)
627	{
628	mOutOfMemory = true;
629	Debug << "memory limit reached: " << mem << endl;
630	}
631	}
632
633	// subdivide leaf node
634	BspNode *r = Subdivide(tQueue, splitCandidate);
635
636	if (r == mRoot)
637	Debug << "VSP BSP tree construction time spent at root: "
638	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
639
640	if (mBspStats.Leaves() >= nLeaves)
641	{
642	nLeaves += 500;
643
644	cout << "leaves=" << mBspStats.Leaves() << endl;
645	Debug << "needed "
646	<< TimeDiff(interTime, GetTime())*1e-3
647	<< " secs to create 500 view cells" << endl;
648	interTime = GetTime();
649	}
650
651	if (mCreatedViewCells == nViewCells)
652	{
653	nViewCells += 500;
654
655	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
656	}
657	}
658
659	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
660	cout << "finished\n";
661
662	mBspStats.Stop();
663	}
664
665
666	bool FromPointVisibilityTree::LocalTerminationCriteriaMet(const VspBspTraversalData &data) const
667	{
668	return
669	(((int)data.mRays->size() <= mTermMinRays) \|\|
670	(data.mPvs <= mTermMinPvs) \|\|
671	(data.mProbability <= mTermMinProbability) \|\|
672	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
673	(data.mDepth >= mTermMaxDepth));
674	}
675
676
677	bool FromPointVisibilityTree::GlobalTerminationCriteriaMet(const VspBspTraversalData &data) const
678	{
679	return
680	(mOutOfMemory
681	\|\| (mBspStats.Leaves() >= mMaxViewCells)
682	\|\| (mGlobalCostMisses >= mTermGlobalCostMissTolerance)
683	);
684	}
685
686
687
688	BspNode *FromPointVisibilityTree::Subdivide(VspBspTraversalQueue &tQueue,
689	VspBspTraversalData &tData)
690	{
691	BspNode *newNode = tData.mNode;
692
693	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
694	{
695	PolygonContainer coincident;
696
697	VspBspTraversalData tFrontData;
698	VspBspTraversalData tBackData;
699
700	// create new interior node and two leaf nodes
701	// or return leaf as it is (if maxCostRatio missed)
702	int splitAxis;
703	bool splitFurther = true;
704	int maxCostMisses = tData.mMaxCostMisses;
705
706	Plane3 splitPlane;
707	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
708
709	// choose next split plane
710	if (!SelectPlane(splitPlane, leaf, tData, tFrontData, tBackData, splitAxis))
711	{
712	++ maxCostMisses;
713
714	if (maxCostMisses > mTermMissTolerance)
715	{
716	// terminate branch because of max cost
717	++ mBspStats.maxCostNodes;
718	splitFurther = false;
719	}
720	}
721
722	// if this a valid split => subdivide this node further
723	if (splitFurther) //-- continue subdivision
724	{
725	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
726
727	if (splitAxis < 3)
728	++ mBspStats.splits[splitAxis];
729	else
730	++ mBspStats.polySplits;
731
732	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
733	tFrontData.mAxis = tBackData.mAxis = splitAxis;
734
735	// how often was max cost ratio missed in this branch?
736	tFrontData.mMaxCostMisses = maxCostMisses;
737	tBackData.mMaxCostMisses = maxCostMisses;
738
739	EvalPriority(tFrontData);
740	EvalPriority(tBackData);
741
742	// evaluate subdivision stats
743	if (1)
744	{
745	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
746	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
747	float cData = (float)tData.mPvs * tData.mProbability;;
748
749	float costDecr = (cFront + cBack - cData) / mBox.GetVolume();
750
751	mTotalCost += costDecr;
752	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
753
754	mSubdivisionStats
755	<< "#ViewCells\n" << mBspStats.Leaves() << endl
756	<< "#RenderCostDecrease\n" << -costDecr << endl
757	<< "#TotalRenderCost\n" << mTotalCost << endl
758	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
759	}
760
761	// push the children on the stack
762	tQueue.push(tFrontData);
763	tQueue.push(tBackData);
764
765	// delete old leaf node
766	DEL_PTR(tData.mNode);
767	}
768	}
769
770	//-- terminate traversal and create new view cell
771	if (newNode->IsLeaf())
772	{
773	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
774	BspViewCell *viewCell = new BspViewCell();
775
776	leaf->SetViewCell(viewCell);
777
778	//-- update pvs
779	int conSamp = 0;
780	float sampCon = 0.0f;
781	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
782
783	// update single pvs parameter
784	viewCell->mPvsSize = viewCell->GetPvs().GetSize();
785	viewCell->mPvsSizeValid = true;
786
787
788	mBspStats.contributingSamples += conSamp;
789	mBspStats.sampleContributions +=(int) sampCon;
790
791	//-- store additional info
792	if (mStoreRays)
793	{
794	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
795	for (it = tData.mRays->begin(); it != it_end; ++ it)
796	{
797	(*it).mRay->Ref();
798	leaf->mVssRays.push_back((*it).mRay);
799	}
800	}
801
802	// should I check here?
803	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0, mViewCellsManager->GetMaxPvsSize()))
804	{
805	viewCell->SetValid(false);
806	leaf->SetTreeValid(false);
807	PropagateUpValidity(leaf);
808
809	++ mBspStats.invalidLeaves;
810	}
811
812	viewCell->mLeaf = leaf;
813
814	if (mUseAreaForPvs)
815	viewCell->SetArea(tData.mProbability);
816	else
817	viewCell->SetVolume(tData.mProbability);
818
819	leaf->mProbability = tData.mProbability;
820
821	EvaluateLeafStats(tData);
822	}
823
824	//-- cleanup
825	tData.Clear();
826
827	return newNode;
828	}
829
830	// subdivide using a split plane queue
831	BspNode *FromPointVisibilityTree::Subdivide(VspBspSplitQueue &tQueue,
832	VspBspSplitCandidate &splitCandidate)
833	{
834	VspBspTraversalData &tData = splitCandidate.mParentData;
835
836	BspNode *newNode = tData.mNode;
837
838	if (!LocalTerminationCriteriaMet(tData) && !GlobalTerminationCriteriaMet(tData))
839	{
840	PolygonContainer coincident;
841
842	VspBspTraversalData tFrontData;
843	VspBspTraversalData tBackData;
844
845	//-- continue subdivision
846
847	// create new interior node and two leaf node
848	const Plane3 splitPlane = splitCandidate.mSplitPlane;
849
850	newNode = SubdivideNode(splitPlane, tData, tFrontData, tBackData, coincident);
851
852	const int splitAxis = splitCandidate.mSplitAxis;
853	const int maxCostMisses = splitCandidate.mMaxCostMisses;
854
855	if (splitAxis < 3)
856	++ mBspStats.splits[splitAxis];
857	else
858	++ mBspStats.polySplits;
859
860	tFrontData.mIsKdNode = tBackData.mIsKdNode = (tData.mIsKdNode && (splitAxis < 3));
861	tFrontData.mAxis = tBackData.mAxis = splitAxis;
862
863	// how often was max cost ratio missed in this branch?
864	tFrontData.mMaxCostMisses = maxCostMisses;
865	tBackData.mMaxCostMisses = maxCostMisses;
866
867
868	if (1)
869	{
870	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
871	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
872	float cData = (float)tData.mPvs * tData.mProbability;
873
874
875	float costDecr =
876	(cFront + cBack - cData) / mBox.GetVolume();
877
878	mTotalCost += costDecr;
879	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
880
881	mSubdivisionStats
882	<< "#ViewCells\n" << mBspStats.Leaves() << endl
883	<< "#RenderCostDecrease\n" << -costDecr << endl
884	<< "#SplitCandidateCost\n" << splitCandidate.GetCost() << endl
885	<< "#TotalRenderCost\n" << mTotalCost << endl
886	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
887	}
888
889
890	//-- push the new split candidates on the stack
891	VspBspSplitCandidate frontCandidate;
892	VspBspSplitCandidate backCandidate;
893
894	EvalSplitCandidate(tFrontData, frontCandidate);
895	EvalSplitCandidate(tBackData, backCandidate);
896
897	tQueue.push(frontCandidate);
898	tQueue.push(backCandidate);
899
900	// delete old leaf node
901	DEL_PTR(tData.mNode);
902	}
903
904
905	//-- terminate traversal and create new view cell
906	if (newNode->IsLeaf())
907	{
908	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
909	BspViewCell *viewCell = new BspViewCell();
910
911	leaf->SetViewCell(viewCell);
912
913	//-- update pvs
914	int conSamp = 0;
915	float sampCon = 0.0f;
916	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
917
918	viewCell->mPvsSize = viewCell->GetPvs().GetSize();
919	viewCell->mPvsSizeValid = true;
920
921	mBspStats.contributingSamples += conSamp;
922	mBspStats.sampleContributions +=(int) sampCon;
923
924	//-- store additional info
925	if (mStoreRays)
926	{
927	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
928	for (it = tData.mRays->begin(); it != it_end; ++ it)
929	{
930	(*it).mRay->Ref();
931	leaf->mVssRays.push_back((*it).mRay);
932	}
933	}
934
935	// should I check here?
936	viewCell->mLeaf = leaf;
937
938	if (mUseAreaForPvs)
939	viewCell->SetArea(tData.mProbability);
940	else
941	viewCell->SetVolume(tData.mProbability);
942
943	leaf->mProbability = tData.mProbability;
944
945	EvaluateLeafStats(tData);
946	}
947
948	//-- cleanup
949	tData.Clear();
950
951	return newNode;
952	}
953
954
955	void FromPointVisibilityTree::EvalPriority(VspBspTraversalData &tData) const
956	{
957	switch (mNodePriorityQueueType)
958	{
959	case BREATH_FIRST:
960	tData.mPriority = (float)-tData.mDepth;
961	break;
962	case DEPTH_FIRST:
963	tData.mPriority = (float)tData.mDepth;
964	break;
965	default:
966	tData.mPriority = tData.mPvs * tData.mProbability;
967	//Debug << "priority: " << tData.mPriority << endl;
968	break;
969	}
970	}
971
972
973	void FromPointVisibilityTree::EvalSplitCandidate(VspBspTraversalData &tData,
974	VspBspSplitCandidate &splitData)
975	{
976	VspBspTraversalData frontData;
977	VspBspTraversalData backData;
978
979	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
980
981	// compute locally best split plane
982	bool success = SelectPlane(splitData.mSplitPlane, leaf, tData,
983	frontData, backData, splitData.mSplitAxis);
984
985	// TODO: reuse
986	DEL_PTR(frontData.mGeometry);
987	DEL_PTR(backData.mGeometry);
988
989	// compute global decrease in render cost
990	splitData.mRenderCost = EvalRenderCostDecrease(splitData.mSplitPlane, tData);
991	splitData.mParentData = tData;
992	splitData.mMaxCostMisses = success ? tData.mMaxCostMisses : tData.mMaxCostMisses + 1;
993	}
994
995
996	BspInterior *FromPointVisibilityTree::SubdivideNode(const Plane3 &splitPlane,
997	VspBspTraversalData &tData,
998	VspBspTraversalData &frontData,
999	VspBspTraversalData &backData,
1000	PolygonContainer &coincident)
1001	{
1002	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
1003
1004	//-- the front and back traversal data is filled with the new values
1005	frontData.mDepth = tData.mDepth + 1;
1006	frontData.mPolygons = new PolygonContainer();
1007	frontData.mRays = new RayInfoContainer();
1008
1009	backData.mDepth = tData.mDepth + 1;
1010	backData.mPolygons = new PolygonContainer();
1011	backData.mRays = new RayInfoContainer();
1012
1013
1014	//-- subdivide rays
1015	SplitRays(splitPlane,
1016	*tData.mRays,
1017	*frontData.mRays,
1018	*backData.mRays);
1019
1020
1021	// compute pvs
1022	frontData.mPvs = ComputePvsSize(*frontData.mRays);
1023	backData.mPvs = ComputePvsSize(*backData.mRays);
1024
1025	// split front and back node geometry and compute area
1026
1027	// if geometry was not already computed
1028	if (!frontData.mGeometry && !backData.mGeometry)
1029	{
1030	frontData.mGeometry = new BspNodeGeometry();
1031	backData.mGeometry = new BspNodeGeometry();
1032
1033	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
1034	*backData.mGeometry,
1035	splitPlane,
1036	mBox,
1037	//0.0f);
1038	mEpsilon);
1039
1040	if (mUseAreaForPvs)
1041	{
1042	frontData.mProbability = frontData.mGeometry->GetArea();
1043	backData.mProbability = backData.mGeometry->GetArea();
1044	}
1045	else
1046	{
1047	frontData.mProbability = frontData.mGeometry->GetVolume();
1048	backData.mProbability = tData.mProbability - frontData.mProbability;
1049
1050	// should never come here: wrong volume !!!
1051	if (0)
1052	{
1053	if (frontData.mProbability < -0.00001)
1054	Debug << "fatal error f: " << frontData.mProbability << endl;
1055	if (backData.mProbability < -0.00001)
1056	Debug << "fatal error b: " << backData.mProbability << endl;
1057
1058	// clamp because of precision issues
1059	if (frontData.mProbability < 0) frontData.mProbability = 0;
1060	if (backData.mProbability < 0) backData.mProbability = 0;
1061	}
1062	}
1063	}
1064
1065
1066	// subdivide polygons
1067	SplitPolygons(splitPlane,
1068	*tData.mPolygons,
1069	*frontData.mPolygons,
1070	*backData.mPolygons,
1071	coincident);
1072
1073
1074
1075	///////////////////////////////////////
1076	// subdivide further
1077
1078	// store maximal and minimal depth
1079	if (tData.mDepth > mBspStats.maxDepth)
1080	{
1081	Debug << "max depth increases to " << tData.mDepth << " at " << mBspStats.Leaves() << " leaves" << endl;
1082	mBspStats.maxDepth = tData.mDepth;
1083	}
1084
1085	mBspStats.nodes += 2;
1086
1087
1088	BspInterior *interior = new BspInterior(splitPlane);
1089
1090	#ifdef _DEBUG
1091	Debug << interior << endl;
1092	#endif
1093
1094
1095	//-- create front and back leaf
1096
1097	BspInterior *parent = leaf->GetParent();
1098
1099	// replace a link from node's parent
1100	if (parent)
1101	{
1102	parent->ReplaceChildLink(leaf, interior);
1103	interior->SetParent(parent);
1104	}
1105	else // new root
1106	{
1107	mRoot = interior;
1108	}
1109
1110	// and setup child links
1111	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
1112
1113	frontData.mNode = interior->GetFront();
1114	backData.mNode = interior->GetBack();
1115
1116	interior->mTimeStamp = mTimeStamp ++;
1117
1118
1119	//DEL_PTR(leaf);
1120	return interior;
1121	}
1122
1123
1124	void FromPointVisibilityTree::Construct(const VisibilityPointsContainer &visibilityPoints,
1125	AxisAlignedBox3 *forcedBoundingBox)
1126	{
1127	/*mBspStats.nodes = 1;
1128	mBox.Initialize(); // initialise BSP tree bounding box
1129
1130	if (forcedBoundingBox)
1131	mBox = *forcedBoundingBox;
1132
1133	PolygonContainer polys;
1134	RayInfoContainer *rays = new RayInfoContainer();
1135
1136	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
1137
1138	long startTime = GetTime();
1139
1140	cout << "Extracting polygons from rays ... ";
1141
1142	Intersectable::NewMail();
1143
1144	int numObj = 0;
1145
1146	//-- extract polygons intersected by the rays
1147	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
1148	{
1149	VssRay ray = rit;
1150
1151	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
1152	ray->mTerminationObject &&
1153	!ray->mTerminationObject->Mailed())
1154	{
1155	ray->mTerminationObject->Mail();
1156	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
1157	AddMeshToPolygons(obj->GetMesh(), polys, obj);
1158	++ numObj;
1159
1160	//-- compute bounding box
1161	if (!forcedBoundingBox)
1162	mBox.Include(ray->mTermination);
1163	}
1164
1165	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
1166	ray->mOriginObject &&
1167	!ray->mOriginObject->Mailed())
1168	{
1169	ray->mOriginObject->Mail();
1170	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
1171	AddMeshToPolygons(obj->GetMesh(), polys, obj);
1172	++ numObj;
1173
1174	//-- compute bounding box
1175	if (!forcedBoundingBox)
1176	mBox.Include(ray->mOrigin);
1177	}
1178	}
1179
1180	Debug << "maximal pvs (i.e., pvs still considered as valid) : "
1181	<< mViewCellsManager->GetMaxPvsSize() << endl;
1182
1183	//-- store rays
1184	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
1185	{
1186	VssRay ray = rit;
1187
1188	float minT, maxT;
1189
1190	static Ray hray;
1191	hray.Init(*ray);
1192
1193	// TODO: not very efficient to implictly cast between rays types
1194	if (mBox.GetRaySegment(hray, minT, maxT))
1195	{
1196	float len = ray->Length();
1197
1198	if (!len)
1199	len = Limits::Small;
1200
1201	rays->push_back(RayInfo(ray, minT / len, maxT / len));
1202	}
1203	}
1204
1205	// normalize
1206	if (mUseAreaForPvs)
1207	mTermMinProbability *= mBox.SurfaceArea();
1208	else
1209	mTermMinProbability *= mBox.GetVolume();
1210
1211	// throw out unnecessary polygons
1212	PreprocessPolygons(polys);
1213
1214	mBspStats.polys = (int)polys.size();
1215	mGlobalCostMisses = 0;
1216
1217	cout << "finished" << endl;
1218
1219	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
1220	<< (int)sampleRays.size() << " rays in "
1221	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
1222
1223	// use split cost priority queue
1224	if (mUseSplitCostQueue)
1225	{
1226	ConstructWithSplitQueue(polys, rays);
1227	}
1228	else
1229	{
1230	Construct(polys, rays);
1231	}
1232
1233	// clean up polygons
1234	CLEAR_CONTAINER(polys);
1235	*/
1236	}
1237
1238
1239
1240	void FromPointVisibilityTree::AddToPvs(BspLeaf *leaf,
1241	const RayInfoContainer &rays,
1242	float &sampleContributions,
1243	int &contributingSamples)
1244	{
1245	sampleContributions = 0;
1246	contributingSamples = 0;
1247
1248
1249	RayInfoContainer::const_iterator it, it_end = rays.end();
1250	ViewCell *vc = leaf->GetViewCell();
1251
1252	// add contributions from samples to the PVS
1253	for (it = rays.begin(); it != it_end; ++ it)
1254	{
1255	float sc = 0.0f;
1256
1257	VssRay ray = (it).mRay;
1258
1259	bool madeContrib = false;
1260	float contribution;
1261
1262	if (ray->mTerminationObject)
1263	{
1264	if (vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf, contribution))
1265	madeContrib = true;
1266	sc += contribution;
1267	}
1268
1269	if (ray->mOriginObject)
1270	{
1271	if (vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf, contribution))
1272	madeContrib = true;
1273	sc += contribution;
1274	}
1275
1276	sampleContributions += sc;
1277	if (madeContrib)
1278	++ contributingSamples;
1279
1280	//leaf->mVssRays.push_back(ray);
1281	}
1282	}
1283
1284
1285	void FromPointVisibilityTree::SortSplitCandidates(const RayInfoContainer &rays,
1286	const int axis,
1287	float minBand,
1288	float maxBand)
1289	{
1290	mSplitCandidates->clear();
1291
1292	int requestedSize = 2 * (int)(rays.size());
1293	// creates a sorted split candidates array
1294	if (mSplitCandidates->capacity() > 500000 &&
1295	requestedSize < (int)(mSplitCandidates->capacity() / 10) )
1296	{
1297	delete mSplitCandidates;
1298	mSplitCandidates = new vector<SortableEntry>;
1299	}
1300
1301	mSplitCandidates->reserve(requestedSize);
1302
1303	float pos;
1304
1305	// float values => don't compare with exact values
1306	if (0)
1307	{
1308	minBand += Limits::Small;
1309	maxBand -= Limits::Small;
1310	}
1311
1312	// insert all queries
1313	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
1314	{
1315	const bool positive = (*ri).mRay->HasPosDir(axis);
1316
1317	pos = (*ri).ExtrapOrigin(axis);
1318	// clamp to min / max band
1319	if (0) ClipValue(pos, minBand, maxBand);
1320
1321	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
1322	pos, (*ri).mRay));
1323
1324	pos = (*ri).ExtrapTermination(axis);
1325	// clamp to min / max band
1326	if (0) ClipValue(pos, minBand, maxBand);
1327
1328	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
1329	pos, (*ri).mRay));
1330	}
1331
1332	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
1333	}
1334
1335
1336	float FromPointVisibilityTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
1337	const AxisAlignedBox3 &box,
1338	const int pvsSize,
1339	const int axis,
1340	float &position)
1341	{
1342	const float minBox = box.Min(axis);
1343	const float maxBox = box.Max(axis);
1344	const float sizeBox = maxBox - minBox;
1345
1346	const float minBand = minBox + mMinBand * sizeBox;
1347	const float maxBand = minBox + mMaxBand * sizeBox;
1348
1349	SortSplitCandidates(rays, axis, minBand, maxBand);
1350
1351	// go through the lists, count the number of objects left and right
1352	// and evaluate the following cost funcion:
1353	// C = ct_div_ci + (qlrl + qrrr)/queries
1354
1355	int pvsl = 0;
1356	int pvsr = pvsSize;
1357
1358	int pvsBack = pvsl;
1359	int pvsFront = pvsr;
1360
1361	float sum = (float)pvsSize * sizeBox;
1362	float minSum = 1e20f;
1363
1364	// if no border can be found, take mid split
1365	position = minBox + 0.5f * sizeBox;
1366
1367	Intersectable::NewMail();
1368
1369	RayInfoContainer::const_iterator ri, ri_end = rays.end();
1370
1371	// set all object as belonging to the front pvs
1372	for(ri = rays.begin(); ri != ri_end; ++ ri)
1373	{
1374	Intersectable oObject = (ri).mRay->mOriginObject;
1375	Intersectable tObject = (ri).mRay->mTerminationObject;
1376
1377	if (oObject)
1378	{
1379	if (!oObject->Mailed())
1380	{
1381	oObject->Mail();
1382	oObject->mCounter = 1;
1383	}
1384	else
1385	{
1386	++ oObject->mCounter;
1387	}
1388	}
1389	if (tObject)
1390	{
1391	if (!tObject->Mailed())
1392	{
1393	tObject->Mail();
1394	tObject->mCounter = 1;
1395	}
1396	else
1397	{
1398	++ tObject->mCounter;
1399	}
1400	}
1401	}
1402
1403	Intersectable::NewMail();
1404
1405	vector<SortableEntry>::const_iterator ci, ci_end = mSplitCandidates->end();
1406
1407	for (ci = mSplitCandidates->begin(); ci < ci_end; ++ ci)
1408	{
1409	VssRay *ray;
1410	ray = (*ci).ray;
1411
1412	Intersectable *oObject = ray->mOriginObject;
1413	Intersectable *tObject = ray->mTerminationObject;
1414
1415
1416	switch ((*ci).type)
1417	{
1418	case SortableEntry::ERayMin:
1419	{
1420	if (oObject && !oObject->Mailed())
1421	{
1422	oObject->Mail();
1423	++ pvsl;
1424	}
1425	if (tObject && !tObject->Mailed())
1426	{
1427	tObject->Mail();
1428	++ pvsl;
1429	}
1430	break;
1431	}
1432	case SortableEntry::ERayMax:
1433	{
1434	if (oObject)
1435	{
1436	if (-- oObject->mCounter == 0)
1437	-- pvsr;
1438	}
1439
1440	if (tObject)
1441	{
1442	if (-- tObject->mCounter == 0)
1443	-- pvsr;
1444	}
1445
1446	break;
1447	}
1448	}
1449
1450	// Note: sufficient to compare size of bounding boxes of front and back side?
1451	if (((ci).value >= minBand) && ((ci).value <= maxBand))
1452	{
1453	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
1454
1455	//cout << "pos=" << (*ci).value << "\t pvs=(" << pvsl << "," << pvsr << ")" << endl;
1456	//cout<<"cost= "<<sum<<endl;
1457
1458	if (sum < minSum)
1459	{
1460	minSum = sum;
1461	position = (*ci).value;
1462
1463	pvsBack = pvsl;
1464	pvsFront = pvsr;
1465	}
1466	}
1467	}
1468
1469	Debug << "pos: " << position << " sizebox: " << sizeBox << " pvs: " << pvsSize << endl;
1470
1471	// -- compute cost
1472	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1473	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1474
1475	const float pOverall = sizeBox;
1476
1477	const float pBack = position - minBox;
1478	const float pFront = maxBox - position;
1479
1480	const float penaltyOld = EvalPvsPenalty(pvsSize, lowerPvsLimit, upperPvsLimit);
1481	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1482	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1483
1484	const float oldRenderCost = penaltyOld * pOverall;
1485	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1486
1487	float ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
1488
1489	//Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
1490	// <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
1491
1492	return ratio;
1493	}
1494
1495
1496	float FromPointVisibilityTree::SelectAxisAlignedPlane(Plane3 &plane,
1497	const VspBspTraversalData &tData,
1498	int &axis,
1499	BspNodeGeometry **frontGeom,
1500	BspNodeGeometry **backGeom,
1501	float &pFront,
1502	float &pBack,
1503	const bool isKdNode)
1504	{
1505	float nPosition[3];
1506	float nCostRatio[3];
1507	float nProbFront[3];
1508	float nProbBack[3];
1509
1510	BspNodeGeometry *nFrontGeom[3];
1511	BspNodeGeometry *nBackGeom[3];
1512
1513	for (int i = 0; i < 3; ++ i)
1514	{
1515	nFrontGeom[i] = NULL;
1516	nBackGeom[i] = NULL;
1517	}
1518
1519	int bestAxis = -1;
1520
1521	// create bounding box of node geometry
1522	AxisAlignedBox3 box;
1523
1524	//TODO: for kd split geometry already is box => only take minmax vertices
1525	if (1)
1526	{
1527	tData.mGeometry->GetBoundingBox(box);
1528	}
1529	else
1530	{
1531	box.Initialize();
1532	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1533
1534	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1535	box.Include((*ri).ExtrapTermination());
1536	}
1537
1538	int sAxis = 0;
1539	// hack : subdivide along driving axis up to certain depth
1540	int maxDepthForDrivingAxis = 0;
1541
1542	const bool useSpecialAxis = mOnlyDrivingAxis \|\| mUseRandomAxis \|\|
1543	mCirculatingAxis \|\| (tData.mDepth < maxDepthForDrivingAxis);
1544
1545
1546	// use some kind of specialised fixed axis
1547	if (mUseRandomAxis)
1548	sAxis = Random(3);
1549	else if (mCirculatingAxis)
1550	sAxis = (tData.mAxis + 1) % 3;
1551	else if (mOnlyDrivingAxis \|\| (tData.mDepth < maxDepthForDrivingAxis))
1552	sAxis = box.Size().DrivingAxis();
1553
1554
1555	//Debug << "use special axis: " << useSpecialAxis << endl;
1556	//Debug << "axis: " << sAxis << " drivingaxis: " << box.Size().DrivingAxis();
1557
1558	for (axis = 0; axis < 3; ++ axis)
1559	{
1560	if (!useSpecialAxis \|\| (axis == sAxis))
1561	{
1562	if (!mUseCostHeuristics)
1563	{
1564	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1565	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1566
1567	// allows faster split because we have axis aligned kd tree boxes
1568	if (1 && isKdNode)
1569	{
1570	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1571	box,
1572	axis,
1573	nPosition[axis],
1574	nProbFront[axis],
1575	nProbBack[axis]);
1576
1577	Vector3 pos;
1578
1579	// create back geometry from box
1580	pos = box.Max(); pos[axis] = nPosition[axis];
1581	AxisAlignedBox3 bBox(box.Min(), pos);
1582	PolygonContainer fPolys;
1583	bBox.ExtractPolys(fPolys);
1584
1585	nBackGeom[axis] = new BspNodeGeometry(fPolys);
1586
1587	// create front geometry from box
1588	pos = box.Min(); pos[axis] = nPosition[axis];
1589	AxisAlignedBox3 fBox(pos, box.Max());
1590
1591	PolygonContainer bPolys;
1592	fBox.ExtractPolys(bPolys);
1593	nFrontGeom[axis] = new BspNodeGeometry(bPolys);
1594	}
1595	else
1596	{
1597	nFrontGeom[axis] = new BspNodeGeometry();
1598	nBackGeom[axis] = new BspNodeGeometry();
1599
1600	nCostRatio[axis] =
1601	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1602	tData, nFrontGeom[axis], nBackGeom[axis],
1603	nProbFront[axis], nProbBack[axis]);
1604	}
1605	}
1606	else
1607	{
1608
1609	nCostRatio[axis] =
1610	BestCostRatioHeuristics(*tData.mRays,
1611	box,
1612	tData.mPvs,
1613	axis,
1614	nPosition[axis]);
1615
1616
1617	}
1618
1619	if (bestAxis == -1)
1620	{
1621	bestAxis = axis;
1622	}
1623	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1624	{
1625	bestAxis = axis;
1626	}
1627
1628	}
1629	}
1630
1631	//-- assign values
1632	axis = bestAxis;
1633	pFront = nProbFront[bestAxis];
1634	pBack = nProbBack[bestAxis];
1635
1636	// assign best split nodes geometry
1637	*frontGeom = nFrontGeom[bestAxis];
1638	*backGeom = nBackGeom[bestAxis];
1639
1640	// and delete other geometry
1641	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1642	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1643
1644	//-- split plane
1645	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1646	plane = Plane3(normal, nPosition[bestAxis]);
1647
1648	return nCostRatio[bestAxis];
1649	}
1650
1651
1652	bool FromPointVisibilityTree::SelectPlane(Plane3 &bestPlane,
1653	BspLeaf *leaf,
1654	VspBspTraversalData &data,
1655	VspBspTraversalData &frontData,
1656	VspBspTraversalData &backData,
1657	int &splitAxis)
1658	{
1659	// HACK matt: subdivide regularily to certain depth
1660	if (data.mDepth < 0)
1661	{
1662	cout << "d: " << data.mDepth << endl;
1663	// return axis aligned split
1664	AxisAlignedBox3 box;
1665	box.Initialize();
1666
1667	// create bounding box of region
1668	data.mGeometry->GetBoundingBox(box);
1669
1670	const int axis = box.Size().DrivingAxis();
1671	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1672
1673	Vector3 norm(0,0,0); norm[axis] = 1.0f;
1674	bestPlane = Plane3(norm, position);
1675	splitAxis = axis;
1676	return true;
1677	}
1678
1679	// simplest strategy: just take next polygon
1680	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1681	{
1682	if (!data.mPolygons->empty())
1683	{
1684	const int randIdx =
1685	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
1686	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1687
1688	bestPlane = nextPoly->GetSupportingPlane();
1689	return true;
1690	}
1691	}
1692
1693	//-- use heuristics to find appropriate plane
1694
1695	// intermediate plane
1696	Plane3 plane;
1697	float lowestCost = MAX_FLOAT;
1698
1699	// decides if the first few splits should be only axisAligned
1700	const bool onlyAxisAligned =
1701	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1702	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1703	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1704
1705	const int limit = onlyAxisAligned ? 0 :
1706	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1707
1708	float candidateCost;
1709
1710	int maxIdx = (int)data.mPolygons->size();
1711
1712	for (int i = 0; i < limit; ++ i)
1713	{
1714	// the already taken candidates are stored behind maxIdx
1715	// => assure that no index is taken twice
1716	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1717	Polygon3 poly = (data.mPolygons)[candidateIdx];
1718
1719	// swap candidate to the end to avoid testing same plane
1720	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1721	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
1722
1723	// evaluate current candidate
1724	BspNodeGeometry fGeom, bGeom;
1725	float fArea, bArea;
1726	plane = poly->GetSupportingPlane();
1727	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1728
1729	if (candidateCost < lowestCost)
1730	{
1731	bestPlane = plane;
1732	lowestCost = candidateCost;
1733	}
1734	}
1735
1736	//-- evaluate axis aligned splits
1737	int axis;
1738	BspNodeGeometry fGeom, bGeom;
1739	float pFront, pBack;
1740
1741	candidateCost = 99999999.0f;
1742
1743	// option: axis aligned split only if no polygon available
1744	if (!mUsePolygonSplitIfAvailable \|\| data.mPolygons->empty())
1745	{
1746	candidateCost = SelectAxisAlignedPlane(plane,
1747	data,
1748	axis,
1749	&fGeom,
1750	&bGeom,
1751	pFront,
1752	pBack,
1753	data.mIsKdNode);
1754	}
1755
1756	splitAxis = 3;
1757
1758	if (candidateCost < lowestCost)
1759	{
1760	bestPlane = plane;
1761	lowestCost = candidateCost;
1762	splitAxis = axis;
1763
1764	// assign already computed values
1765	// we can do this because we always save the
1766	// computed values from the axis aligned splits
1767
1768	if (fGeom && bGeom)
1769	{
1770	frontData.mGeometry = fGeom;
1771	backData.mGeometry = bGeom;
1772
1773	frontData.mProbability = pFront;
1774	backData.mProbability = pBack;
1775	}
1776	}
1777	else
1778	{
1779	DEL_PTR(fGeom);
1780	DEL_PTR(bGeom);
1781	}
1782
1783	#ifdef _DEBUG
1784	Debug << "plane lowest cost: " << lowestCost << endl;
1785	#endif
1786
1787	// exeeded relative max cost ratio
1788	if (lowestCost > mTermMaxCostRatio)
1789	{
1790	return false;
1791	}
1792
1793	return true;
1794	}
1795
1796
1797	Plane3 FromPointVisibilityTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1798	{
1799	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1800
1801	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1802	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1803
1804	const Vector3 pt = (maxPt + minPt) * 0.5;
1805	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1806
1807	return Plane3(normal, pt);
1808	}
1809
1810
1811	Plane3 FromPointVisibilityTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1812	{
1813	Vector3 pt[3];
1814
1815	int idx[3];
1816	int cmaxT = 0;
1817	int cminT = 0;
1818	bool chooseMin = false;
1819
1820	for (int j = 0; j < 3; ++ j)
1821	{
1822	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1823
1824	if (idx[j] >= (int)rays.size())
1825	{
1826	idx[j] -= (int)rays.size();
1827
1828	chooseMin = (cminT < 2);
1829	}
1830	else
1831	chooseMin = (cmaxT < 2);
1832
1833	RayInfo rayInf = rays[idx[j]];
1834	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1835	}
1836
1837	return Plane3(pt[0], pt[1], pt[2]);
1838	}
1839
1840
1841	Plane3 FromPointVisibilityTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1842	{
1843	Vector3 pt[3];
1844
1845	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1846	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1847
1848	// check if rays different
1849	if (idx1 == idx2)
1850	idx2 = (idx2 + 1) % (int)rays.size();
1851
1852	const RayInfo ray1 = rays[idx1];
1853	const RayInfo ray2 = rays[idx2];
1854
1855	// normal vector of the plane parallel to both lines
1856	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1857
1858	// vector from line 1 to line 2
1859	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1860
1861	// project vector on normal to get distance
1862	const float dist = DotProd(vd, norm);
1863
1864	// point on plane lies halfway between the two planes
1865	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1866
1867	return Plane3(norm, planePt);
1868	}
1869
1870
1871	inline void FromPointVisibilityTree::GenerateUniqueIdsForPvs()
1872	{
1873	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1874	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1875	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1876	}
1877
1878
1879	float FromPointVisibilityTree::EvalRenderCostDecrease(const Plane3 &candidatePlane,
1880	const VspBspTraversalData &data) const
1881	{
1882	float pvsFront = 0;
1883	float pvsBack = 0;
1884	float totalPvs = 0;
1885
1886	// probability that view point lies in back / front node
1887	float pOverall = data.mProbability;
1888	float pFront = 0;
1889	float pBack = 0;
1890
1891
1892	// create unique ids for pvs heuristics
1893	GenerateUniqueIdsForPvs();
1894
1895	for (int i = 0; i < data.mRays->size(); ++ i)
1896	{
1897	RayInfo rayInf = (*data.mRays)[i];
1898
1899	float t;
1900	VssRay *ray = rayInf.mRay;
1901	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1902
1903	// find front and back pvs for origing and termination object
1904	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
1905	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
1906	}
1907
1908
1909	BspNodeGeometry geomFront;
1910	BspNodeGeometry geomBack;
1911
1912	// construct child geometry with regard to the candidate split plane
1913	data.mGeometry->SplitGeometry(geomFront,
1914	geomBack,
1915	candidatePlane,
1916	mBox,
1917	//0.0f);
1918	mEpsilon);
1919
1920	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
1921	{
1922	pFront = geomFront.GetVolume();
1923	pBack = pOverall - pFront;
1924
1925	// something is wrong with the volume
1926	if ((pFront < 0.0) \|\| (pBack < 0.0))
1927	{
1928	Debug << "ERROR in volume:\n"
1929	<< "volume f :" << pFront << " b: " << pBack << " p: " << pOverall
1930	<< ", real volume f: " << pFront << " b: " << geomBack.GetVolume()
1931	<< ", #polygons f: " << geomFront.Size() << " b: " << geomBack.Size() << " p: " << data.mGeometry->Size() << endl;
1932	}
1933	}
1934	else
1935	{
1936	pFront = geomFront.GetArea();
1937	pBack = geomBack.GetArea();
1938	}
1939
1940
1941	// -- pvs rendering heuristics
1942	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1943	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1944
1945	// only render cost heuristics or combined with standard deviation
1946	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
1947	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1948	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1949
1950	const float oldRenderCost = pOverall * penaltyOld;
1951	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1952
1953	//Debug << "decrease: " << oldRenderCost - newRenderCost << endl;
1954	const float renderCostDecrease = (oldRenderCost - newRenderCost) / mBox.GetVolume();
1955
1956
1957	#if 1
1958	// also take render cost of node into account to avoid unsubdivided regions which
1959	// could reduce the render cost after some subdivisions
1960	const float normalizedOldRenderCost = oldRenderCost / mBox.GetVolume();
1961	return 0.99f * renderCostDecrease + 0.01f * normalizedOldRenderCost;
1962	#else
1963	return renderCostDecrease;
1964	#endif
1965	}
1966
1967
1968	float FromPointVisibilityTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
1969	const VspBspTraversalData &data,
1970	BspNodeGeometry &geomFront,
1971	BspNodeGeometry &geomBack,
1972	float &pFront,
1973	float &pBack) const
1974	{
1975	float cost = 0;
1976
1977	float totalPvs = 0;
1978	float pvsFront = 0;
1979	float pvsBack = 0;
1980
1981	// probability that view point lies in back / front node
1982	float pOverall = 0;
1983	pFront = 0;
1984	pBack = 0;
1985
1986
1987	int limit;
1988	bool useRand;
1989
1990	// create unique ids for pvs heuristics
1991	GenerateUniqueIdsForPvs();
1992
1993	// choose test rays randomly if too much
1994	if ((int)data.mRays->size() > mMaxTests)
1995	{
1996	useRand = true;
1997	limit = mMaxTests;
1998	}
1999	else
2000	{
2001	useRand = false;
2002	limit = (int)data.mRays->size();
2003	}
2004
2005	for (int i = 0; i < limit; ++ i)
2006	{
2007	const int testIdx = useRand ?
2008	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
2009	RayInfo rayInf = (*data.mRays)[testIdx];
2010
2011	float t;
2012	VssRay *ray = rayInf.mRay;
2013	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
2014
2015	// find front and back pvs for origing and termination object
2016	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
2017	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
2018	}
2019
2020	// construct child geometry with regard to the candidate split plane
2021	bool splitSuccessFull = data.mGeometry->SplitGeometry(geomFront,
2022	geomBack,
2023	candidatePlane,
2024	mBox,
2025	//0.0f);
2026	mEpsilon);
2027
2028	pOverall = data.mProbability;
2029
2030	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
2031	{
2032	pFront = geomFront.GetVolume();
2033	pBack = pOverall - pFront;
2034
2035	// HACK: precision issues possible for unbalanced split => don't take this split!
2036	if (1 &&
2037	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
2038	!geomFront.Valid() \|\| !geomBack.Valid()))
2039	{
2040	//Debug << "error f: " << pFront << " b: " << pBack << endl;
2041	// high penalty for this split
2042	return 99999.9f;
2043	}
2044	}
2045	else
2046	{
2047	pFront = geomFront.GetArea();
2048	pBack = geomBack.GetArea();
2049	}
2050
2051
2052	// -- pvs rendering heuristics
2053	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
2054	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
2055
2056	// only render cost heuristics or combined with standard deviation
2057	const float penaltyOld = EvalPvsPenalty((int)totalPvs, lowerPvsLimit, upperPvsLimit);
2058	const float penaltyFront = EvalPvsPenalty((int)pvsFront, lowerPvsLimit, upperPvsLimit);
2059	const float penaltyBack = EvalPvsPenalty((int)pvsBack, lowerPvsLimit, upperPvsLimit);
2060
2061	const float oldRenderCost = pOverall * penaltyOld;
2062	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
2063
2064	float oldCost, newCost;
2065
2066	// only render cost
2067	if (1)
2068	{
2069	oldCost = oldRenderCost;
2070	newCost = newRenderCost;
2071	}
2072	else // also considering standard deviation
2073	{
2074	// standard deviation is difference of back and front pvs
2075	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
2076
2077	const float newDeviation = 0.5f *
2078	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
2079
2080	const float oldDeviation = penaltyOld;
2081
2082	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
2083	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
2084	}
2085
2086	cost += mPvsFactor * newCost / (oldCost + Limits::Small);
2087
2088
2089	#ifdef _DEBUG
2090	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
2091	<< " frontpvs: " << pvsFront << " pFront: " << pFront
2092	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
2093	Debug << "cost: " << cost << endl;
2094	#endif
2095
2096	return cost;
2097	}
2098
2099
2100	int FromPointVisibilityTree::ComputeBoxIntersections(const AxisAlignedBox3 &box,
2101	ViewCellContainer &viewCells) const
2102	{
2103	stack<bspNodePair> nodeStack;
2104	BspNodeGeometry *rgeom = new BspNodeGeometry();
2105
2106	ConstructGeometry(mRoot, *rgeom);
2107
2108	nodeStack.push(bspNodePair(mRoot, rgeom));
2109
2110	ViewCell::NewMail();
2111
2112	while (!nodeStack.empty())
2113	{
2114	BspNode *node = nodeStack.top().first;
2115	BspNodeGeometry *geom = nodeStack.top().second;
2116	nodeStack.pop();
2117
2118	const int side = geom->ComputeIntersection(box);
2119
2120	switch (side)
2121	{
2122	case -1:
2123	// node geometry is contained in box
2124	CollectViewCells(node, true, viewCells, true);
2125	break;
2126
2127	case 0:
2128	if (node->IsLeaf())
2129	{
2130	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2131
2132	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2133	{
2134	leaf->GetViewCell()->Mail();
2135	viewCells.push_back(leaf->GetViewCell());
2136	}
2137	}
2138	else
2139	{
2140	BspInterior interior = dynamic_cast<BspInterior >(node);
2141
2142	BspNode *first = interior->GetFront();
2143	BspNode *second = interior->GetBack();
2144
2145	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2146	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2147
2148	geom->SplitGeometry(*firstGeom,
2149	*secondGeom,
2150	interior->GetPlane(),
2151	mBox,
2152	//0.0000001f);
2153	mEpsilon);
2154
2155	nodeStack.push(bspNodePair(first, firstGeom));
2156	nodeStack.push(bspNodePair(second, secondGeom));
2157	}
2158
2159	break;
2160	default:
2161	// default: cull
2162	break;
2163	}
2164
2165	DEL_PTR(geom);
2166
2167	}
2168
2169	return (int)viewCells.size();
2170	}
2171
2172
2173	float FromPointVisibilityTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
2174	const AxisAlignedBox3 &box,
2175	const int axis,
2176	const float &position,
2177	float &pFront,
2178	float &pBack) const
2179	{
2180	float pvsTotal = 0;
2181	float pvsFront = 0;
2182	float pvsBack = 0;
2183
2184	// create unique ids for pvs heuristics
2185	GenerateUniqueIdsForPvs();
2186
2187	const int pvsSize = data.mPvs;
2188
2189	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
2190
2191	// this is the main ray classification loop!
2192	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
2193	{
2194	//if (!(*rit).mRay->IsActive()) continue;
2195
2196	// determine the side of this ray with respect to the plane
2197	float t;
2198	const int side = (*rit).ComputeRayIntersection(axis, position, t);
2199
2200	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
2201	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
2202	}
2203
2204	//-- pvs heuristics
2205	float pOverall;
2206
2207	//-- compute heurstics
2208	//-- we take simplified computation for mid split
2209
2210	pOverall = data.mProbability;
2211
2212	if (!mUseAreaForPvs)
2213	{ // volume
2214	pBack = pFront = pOverall * 0.5f;
2215
2216	#if 0
2217	// box length substitute for probability
2218	const float minBox = box.Min(axis);
2219	const float maxBox = box.Max(axis);
2220
2221	pBack = position - minBox;
2222	pFront = maxBox - position;
2223	pOverall = maxBox - minBox;
2224	#endif
2225	}
2226	else //-- area substitute for probability
2227	{
2228	const int axis2 = (axis + 1) % 3;
2229	const int axis3 = (axis + 2) % 3;
2230
2231	const float faceArea =
2232	(box.Max(axis2) - box.Min(axis2)) *
2233	(box.Max(axis3) - box.Min(axis3));
2234
2235	pBack = pFront = pOverall * 0.5f + faceArea;
2236	}
2237
2238	#ifdef _DEBUG
2239	Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
2240	Debug << pFront << " " << pBack << " " << pOverall << endl;
2241	#endif
2242
2243
2244	const float newCost = pvsBack * pBack + pvsFront * pFront;
2245	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
2246
2247	return (mCtDivCi + newCost) / oldCost;
2248	}
2249
2250
2251	void FromPointVisibilityTree::AddObjToPvs(Intersectable *obj,
2252	const int cf,
2253	float &frontPvs,
2254	float &backPvs,
2255	float &totalPvs) const
2256	{
2257	if (!obj)
2258	return;
2259
2260	const float renderCost = mViewCellsManager->EvalRenderCost(obj);
2261
2262	// new object
2263	if ((obj->mMailbox != sFrontId) &&
2264	(obj->mMailbox != sBackId) &&
2265	(obj->mMailbox != sFrontAndBackId))
2266	{
2267	totalPvs += renderCost;
2268	}
2269
2270	// TODO: does this really belong to no pvs?
2271	//if (cf == Ray::COINCIDENT) return;
2272
2273	// object belongs to both PVS
2274	if (cf >= 0)
2275	{
2276	if ((obj->mMailbox != sFrontId) &&
2277	(obj->mMailbox != sFrontAndBackId))
2278	{
2279	frontPvs += renderCost;
2280
2281	if (obj->mMailbox == sBackId)
2282	obj->mMailbox = sFrontAndBackId;
2283	else
2284	obj->mMailbox = sFrontId;
2285	}
2286	}
2287
2288	if (cf <= 0)
2289	{
2290	if ((obj->mMailbox != sBackId) &&
2291	(obj->mMailbox != sFrontAndBackId))
2292	{
2293	backPvs += renderCost;
2294
2295	if (obj->mMailbox == sFrontId)
2296	obj->mMailbox = sFrontAndBackId;
2297	else
2298	obj->mMailbox = sBackId;
2299	}
2300	}
2301	}
2302
2303
2304	void FromPointVisibilityTree::CollectLeaves(vector<BspLeaf *> &leaves,
2305	const bool onlyUnmailed,
2306	const int maxPvsSize) const
2307	{
2308	stack<BspNode *> nodeStack;
2309	nodeStack.push(mRoot);
2310
2311	while (!nodeStack.empty())
2312	{
2313	BspNode *node = nodeStack.top();
2314	nodeStack.pop();
2315
2316	if (node->IsLeaf())
2317	{
2318	// test if this leaf is in valid view space
2319	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2320	if (leaf->TreeValid() &&
2321	(!onlyUnmailed \|\| !leaf->Mailed()) &&
2322	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().GetSize() <= maxPvsSize)))
2323	{
2324	leaves.push_back(leaf);
2325	}
2326	}
2327	else
2328	{
2329	BspInterior interior = dynamic_cast<BspInterior >(node);
2330
2331	nodeStack.push(interior->GetBack());
2332	nodeStack.push(interior->GetFront());
2333	}
2334	}
2335	}
2336
2337
2338	AxisAlignedBox3 FromPointVisibilityTree::GetBoundingBox() const
2339	{
2340	return mBox;
2341	}
2342
2343
2344	BspNode *FromPointVisibilityTree::GetRoot() const
2345	{
2346	return mRoot;
2347	}
2348
2349
2350	void FromPointVisibilityTree::EvaluateLeafStats(const VspBspTraversalData &data)
2351	{
2352	// the node became a leaf -> evaluate stats for leafs
2353	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
2354
2355
2356	if (data.mPvs > mBspStats.maxPvs)
2357	{
2358	mBspStats.maxPvs = data.mPvs;
2359	}
2360
2361	mBspStats.pvs += data.mPvs;
2362
2363	if (data.mDepth < mBspStats.minDepth)
2364	{
2365	mBspStats.minDepth = data.mDepth;
2366	}
2367
2368	if (data.mDepth >= mTermMaxDepth)
2369	{
2370	++ mBspStats.maxDepthNodes;
2371	//Debug << "new max depth: " << mBspStats.maxDepthNodes << endl;
2372	}
2373
2374	// accumulate rays to compute rays / leaf
2375	mBspStats.accumRays += (int)data.mRays->size();
2376
2377	if (data.mPvs < mTermMinPvs)
2378	++ mBspStats.minPvsNodes;
2379
2380	if ((int)data.mRays->size() < mTermMinRays)
2381	++ mBspStats.minRaysNodes;
2382
2383	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
2384	++ mBspStats.maxRayContribNodes;
2385
2386	if (data.mProbability <= mTermMinProbability)
2387	++ mBspStats.minProbabilityNodes;
2388
2389	// accumulate depth to compute average depth
2390	mBspStats.accumDepth += data.mDepth;
2391
2392	++ mCreatedViewCells;
2393
2394	#ifdef _DEBUG
2395	Debug << "BSP stats: "
2396	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
2397	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
2398	// << "Area: " << data.mProbability << " (min: " << mTermMinProbability << "), "
2399	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
2400	<< "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
2401	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
2402	#endif
2403	}
2404
2405
2406	int FromPointVisibilityTree::CastRay(Ray &ray)
2407	{
2408	int hits = 0;
2409
2410	stack<BspRayTraversalData> tQueue;
2411
2412	float maxt, mint;
2413
2414	if (!mBox.GetRaySegment(ray, mint, maxt))
2415	return 0;
2416
2417	Intersectable::NewMail();
2418	ViewCell::NewMail();
2419	Vector3 entp = ray.Extrap(mint);
2420	Vector3 extp = ray.Extrap(maxt);
2421
2422	BspNode *node = mRoot;
2423	BspNode *farChild = NULL;
2424
2425	while (1)
2426	{
2427	if (!node->IsLeaf())
2428	{
2429	BspInterior in = dynamic_cast<BspInterior >(node);
2430
2431	Plane3 splitPlane = in->GetPlane();
2432	const int entSide = splitPlane.Side(entp);
2433	const int extSide = splitPlane.Side(extp);
2434
2435	if (entSide < 0)
2436	{
2437	node = in->GetBack();
2438
2439	if(extSide <= 0) // plane does not split ray => no far child
2440	continue;
2441
2442	farChild = in->GetFront(); // plane splits ray
2443
2444	} else if (entSide > 0)
2445	{
2446	node = in->GetFront();
2447
2448	if (extSide >= 0) // plane does not split ray => no far child
2449	continue;
2450
2451	farChild = in->GetBack(); // plane splits ray
2452	}
2453	else // ray and plane are coincident
2454	{
2455	// WHAT TO DO IN THIS CASE ?
2456	//break;
2457	node = in->GetFront();
2458	continue;
2459	}
2460
2461	// push data for far child
2462	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
2463
2464	// find intersection of ray segment with plane
2465	float t;
2466	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
2467	maxt *= t;
2468
2469	} else // reached leaf => intersection with view cell
2470	{
2471	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2472
2473	if (!leaf->GetViewCell()->Mailed())
2474	{
2475	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
2476	leaf->GetViewCell()->Mail();
2477	++ hits;
2478	}
2479
2480	//-- fetch the next far child from the stack
2481	if (tQueue.empty())
2482	break;
2483
2484	entp = extp;
2485	mint = maxt; // NOTE: need this?
2486
2487	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
2488	break;
2489
2490	BspRayTraversalData &s = tQueue.top();
2491
2492	node = s.mNode;
2493	extp = s.mExitPoint;
2494	maxt = s.mMaxT;
2495
2496	tQueue.pop();
2497	}
2498	}
2499
2500	return hits;
2501	}
2502
2503
2504	void FromPointVisibilityTree::CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const
2505	{
2506	ViewCell::NewMail();
2507
2508	CollectViewCells(mRoot, onlyValid, viewCells, true);
2509	}
2510
2511
2512	void FromPointVisibilityTree::CollapseViewCells()
2513	{
2514	// TODO
2515	#if HAS_TO_BE_REDONE
2516	stack<BspNode *> nodeStack;
2517
2518	if (!mRoot)
2519	return;
2520
2521	nodeStack.push(mRoot);
2522
2523	while (!nodeStack.empty())
2524	{
2525	BspNode *node = nodeStack.top();
2526	nodeStack.pop();
2527
2528	if (node->IsLeaf())
2529	{
2530	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2531
2532	if (!viewCell->GetValid())
2533	{
2534	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
2535
2536	ViewCellContainer leaves;
2537	mViewCellsTree->CollectLeaves(viewCell, leaves);
2538
2539	ViewCellContainer::const_iterator it, it_end = leaves.end();
2540
2541	for (it = leaves.begin(); it != it_end; ++ it)
2542	{
2543	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2544	l->SetViewCell(GetOrCreateOutOfBoundsCell());
2545	++ mBspStats.invalidLeaves;
2546	}
2547
2548	// add to unbounded view cell
2549	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
2550	DEL_PTR(viewCell);
2551	}
2552	}
2553	else
2554	{
2555	BspInterior interior = dynamic_cast<BspInterior >(node);
2556
2557	nodeStack.push(interior->GetFront());
2558	nodeStack.push(interior->GetBack());
2559	}
2560	}
2561
2562	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2563	#endif
2564	}
2565
2566
2567	void FromPointVisibilityTree::CollectRays(VssRayContainer &rays)
2568	{
2569	vector<BspLeaf *> leaves;
2570
2571	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
2572
2573	for (lit = leaves.begin(); lit != lit_end; ++ lit)
2574	{
2575	BspLeaf leaf = lit;
2576	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
2577
2578	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
2579	rays.push_back(*rit);
2580	}
2581	}
2582
2583
2584	void FromPointVisibilityTree::ValidateTree()
2585	{
2586	stack<BspNode *> nodeStack;
2587
2588	if (!mRoot)
2589	return;
2590
2591	nodeStack.push(mRoot);
2592
2593	mBspStats.invalidLeaves = 0;
2594	while (!nodeStack.empty())
2595	{
2596	BspNode *node = nodeStack.top();
2597	nodeStack.pop();
2598
2599	if (node->IsLeaf())
2600	{
2601	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2602
2603	if (!leaf->GetViewCell()->GetValid())
2604	++ mBspStats.invalidLeaves;
2605
2606	// validity flags don't match => repair
2607	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
2608	{
2609	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
2610	PropagateUpValidity(leaf);
2611	}
2612	}
2613	else
2614	{
2615	BspInterior interior = dynamic_cast<BspInterior >(node);
2616
2617	nodeStack.push(interior->GetFront());
2618	nodeStack.push(interior->GetBack());
2619	}
2620	}
2621
2622	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
2623	}
2624
2625
2626
2627	void FromPointVisibilityTree::CollectViewCells(BspNode *root,
2628	bool onlyValid,
2629	ViewCellContainer &viewCells,
2630	bool onlyUnmailed) const
2631	{
2632	stack<BspNode *> nodeStack;
2633
2634	if (!root)
2635	return;
2636
2637	nodeStack.push(root);
2638
2639	while (!nodeStack.empty())
2640	{
2641	BspNode *node = nodeStack.top();
2642	nodeStack.pop();
2643
2644	if (node->IsLeaf())
2645	{
2646	if (!onlyValid \|\| node->TreeValid())
2647	{
2648	ViewCell leafVc = dynamic_cast<BspLeaf >(node)->GetViewCell();
2649
2650	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leafVc);
2651
2652	if (!onlyUnmailed \|\| !viewCell->Mailed())
2653	{
2654	viewCell->Mail();
2655	viewCells.push_back(viewCell);
2656	}
2657	}
2658	}
2659	else
2660	{
2661	BspInterior interior = dynamic_cast<BspInterior >(node);
2662
2663	nodeStack.push(interior->GetFront());
2664	nodeStack.push(interior->GetBack());
2665	}
2666	}
2667
2668	}
2669
2670
2671	void FromPointVisibilityTree::PreprocessPolygons(PolygonContainer &polys)
2672	{
2673	// preprocess: throw out polygons coincident to the view space box (not needed)
2674	PolygonContainer boxPolys;
2675	mBox.ExtractPolys(boxPolys);
2676	vector<Plane3> boxPlanes;
2677
2678	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2679
2680	// extract planes of box
2681	// TODO: can be done more elegantly than first extracting polygons
2682	// and take their planes
2683	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2684	{
2685	boxPlanes.push_back((*pit)->GetSupportingPlane());
2686	}
2687
2688	pit_end = polys.end();
2689
2690	for (pit = polys.begin(); pit != pit_end; ++ pit)
2691	{
2692	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2693
2694	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2695	{
2696	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2697
2698	if (cf == Polygon3::COINCIDENT)
2699	{
2700	DEL_PTR(*pit);
2701	//Debug << "coincident!!" << endl;
2702	}
2703	}
2704	}
2705
2706	// remove deleted entries
2707	for (int i = 0; i < (int)polys.size(); ++ i)
2708	{
2709	while (!polys[i] && (i < (int)polys.size()))
2710	{
2711	swap(polys[i], polys.back());
2712	polys.pop_back();
2713	}
2714	}
2715	}
2716
2717
2718	float FromPointVisibilityTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2719	{
2720	float len = 0;
2721
2722	RayInfoContainer::const_iterator it, it_end = rays.end();
2723
2724	for (it = rays.begin(); it != it_end; ++ it)
2725	len += (*it).SegmentLength();
2726
2727	return len;
2728	}
2729
2730
2731	int FromPointVisibilityTree::SplitRays(const Plane3 &plane,
2732	RayInfoContainer &rays,
2733	RayInfoContainer &frontRays,
2734	RayInfoContainer &backRays) const
2735	{
2736	int splits = 0;
2737
2738	RayInfoContainer::const_iterator it, it_end = rays.end();
2739
2740	for (it = rays.begin(); it != it_end; ++ it)
2741	{
2742	RayInfo bRay = *it;
2743
2744	VssRay *ray = bRay.mRay;
2745	float t;
2746
2747	// get classification and receive new t
2748	const int cf = bRay.ComputeRayIntersection(plane, t);
2749
2750	switch (cf)
2751	{
2752	case -1:
2753	backRays.push_back(bRay);
2754	break;
2755	case 1:
2756	frontRays.push_back(bRay);
2757	break;
2758	case 0:
2759	{
2760	//-- split ray
2761	// test if start point behind or in front of plane
2762	const int side = plane.Side(bRay.ExtrapOrigin());
2763
2764	if (side <= 0)
2765	{
2766	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2767	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2768	}
2769	else
2770	{
2771	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2772	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2773	}
2774	}
2775	break;
2776	default:
2777	Debug << "Should not come here" << endl;
2778	break;
2779	}
2780	}
2781
2782	return splits;
2783	}
2784
2785
2786	void FromPointVisibilityTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2787	{
2788	BspNode *lastNode;
2789
2790	do
2791	{
2792	lastNode = n;
2793
2794	// want to get planes defining geometry of this node => don't take
2795	// split plane of node itself
2796	n = n->GetParent();
2797
2798	if (n)
2799	{
2800	BspInterior interior = dynamic_cast<BspInterior >(n);
2801	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
2802
2803	if (interior->GetBack() != lastNode)
2804	halfSpace.ReverseOrientation();
2805
2806	halfSpaces.push_back(halfSpace);
2807	}
2808	}
2809	while (n);
2810	}
2811
2812
2813	void FromPointVisibilityTree::ConstructGeometry(BspNode *n,
2814	BspNodeGeometry &geom) const
2815	{
2816	vector<Plane3> halfSpaces;
2817	ExtractHalfSpaces(n, halfSpaces);
2818
2819	PolygonContainer candidatePolys;
2820	vector<Plane3> candidatePlanes;
2821
2822	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
2823
2824	// bounded planes are added to the polygons
2825	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
2826	{
2827	Polygon3 p = GetBoundingBox().CrossSection(pit);
2828
2829	if (p->Valid(mEpsilon))
2830	{
2831	candidatePolys.push_back(p);
2832	candidatePlanes.push_back(*pit);
2833	}
2834	}
2835
2836	// add faces of bounding box (also could be faces of the cell)
2837	for (int i = 0; i < 6; ++ i)
2838	{
2839	VertexContainer vertices;
2840
2841	for (int j = 0; j < 4; ++ j)
2842	vertices.push_back(mBox.GetFace(i).mVertices[j]);
2843
2844	Polygon3 *poly = new Polygon3(vertices);
2845
2846	candidatePolys.push_back(poly);
2847	candidatePlanes.push_back(poly->GetSupportingPlane());
2848	}
2849
2850	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2851	{
2852	// polygon is split by all other planes
2853	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2854	{
2855	if (i == j) // polygon and plane are coincident
2856	continue;
2857
2858	VertexContainer splitPts;
2859	Polygon3 frontPoly, backPoly;
2860
2861	const int cf =
2862	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2863	mEpsilon);
2864
2865	switch (cf)
2866	{
2867	case Polygon3::SPLIT:
2868	frontPoly = new Polygon3();
2869	backPoly = new Polygon3();
2870
2871	candidatePolys[i]->Split(halfSpaces[j],
2872	*frontPoly,
2873	*backPoly,
2874	mEpsilon);
2875
2876	DEL_PTR(candidatePolys[i]);
2877
2878	if (backPoly->Valid(mEpsilon))
2879	candidatePolys[i] = backPoly;
2880	else
2881	DEL_PTR(backPoly);
2882
2883	// outside, don't need this
2884	DEL_PTR(frontPoly);
2885	break;
2886	// polygon outside of halfspace
2887	case Polygon3::FRONT_SIDE:
2888	DEL_PTR(candidatePolys[i]);
2889	break;
2890	// just take polygon as it is
2891	case Polygon3::BACK_SIDE:
2892	case Polygon3::COINCIDENT:
2893	default:
2894	break;
2895	}
2896	}
2897
2898	if (candidatePolys[i])
2899	{
2900	geom.Add(candidatePolys[i], candidatePlanes[i]);
2901	// geom.mPolys.push_back(candidates[i]);
2902	}
2903	}
2904	}
2905
2906
2907	void FromPointVisibilityTree::ConstructGeometry(ViewCell *vc,
2908	BspNodeGeometry &vcGeom) const
2909	{
2910	ViewCellContainer leaves;
2911
2912	mViewCellsTree->CollectLeaves(vc, leaves);
2913
2914	ViewCellContainer::const_iterator it, it_end = leaves.end();
2915
2916	for (it = leaves.begin(); it != it_end; ++ it)
2917	{
2918	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2919
2920	ConstructGeometry(l, vcGeom);
2921	}
2922	}
2923
2924
2925	int FromPointVisibilityTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
2926	const bool onlyUnmailed) const
2927	{
2928	stack<bspNodePair> nodeStack;
2929
2930	BspNodeGeometry nodeGeom;
2931	ConstructGeometry(n, nodeGeom);
2932	// const float eps = 0.5f;
2933	const float eps = 0.01f;
2934	// split planes from the root to this node
2935	// needed to verify that we found neighbor leaf
2936	// TODO: really needed?
2937	vector<Plane3> halfSpaces;
2938	ExtractHalfSpaces(n, halfSpaces);
2939
2940
2941	BspNodeGeometry *rgeom = new BspNodeGeometry();
2942	ConstructGeometry(mRoot, *rgeom);
2943
2944	nodeStack.push(bspNodePair(mRoot, rgeom));
2945
2946	while (!nodeStack.empty())
2947	{
2948	BspNode *node = nodeStack.top().first;
2949	BspNodeGeometry *geom = nodeStack.top().second;
2950
2951	nodeStack.pop();
2952
2953	if (node->IsLeaf())
2954	{
2955	// test if this leaf is in valid view space
2956	if (node->TreeValid() &&
2957	(node != n) &&
2958	(!onlyUnmailed \|\| !node->Mailed()))
2959	{
2960	bool isAdjacent = true;
2961
2962	if (1)
2963	{
2964	// test all planes of current node if still adjacent
2965	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
2966	{
2967	const int cf =
2968	Polygon3::ClassifyPlane(geom->GetPolys(),
2969	halfSpaces[i],
2970	eps);
2971
2972	if (cf == Polygon3::FRONT_SIDE)
2973	{
2974	isAdjacent = false;
2975	}
2976	}
2977	}
2978	else
2979	{
2980	// TODO: why is this wrong??
2981	// test all planes of current node if still adjacent
2982	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
2983	{
2984	Polygon3 *poly = nodeGeom.GetPolys()[i];
2985
2986	const int cf =
2987	Polygon3::ClassifyPlane(geom->GetPolys(),
2988	poly->GetSupportingPlane(),
2989	eps);
2990
2991	if (cf == Polygon3::FRONT_SIDE)
2992	{
2993	isAdjacent = false;
2994	}
2995	}
2996	}
2997	// neighbor was found
2998	if (isAdjacent)
2999	{
3000	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
3001	}
3002	}
3003	}
3004	else
3005	{
3006	BspInterior interior = dynamic_cast<BspInterior >(node);
3007
3008	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3009	interior->GetPlane(),
3010	eps);
3011
3012	BspNode *front = interior->GetFront();
3013	BspNode *back = interior->GetBack();
3014
3015	BspNodeGeometry *fGeom = new BspNodeGeometry();
3016	BspNodeGeometry *bGeom = new BspNodeGeometry();
3017
3018	geom->SplitGeometry(*fGeom,
3019	*bGeom,
3020	interior->GetPlane(),
3021	mBox,
3022	//0.0000001f);
3023	eps);
3024
3025	if (cf == Polygon3::BACK_SIDE)
3026	{
3027	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3028	DEL_PTR(fGeom);
3029	}
3030	else
3031	{
3032	if (cf == Polygon3::FRONT_SIDE)
3033	{
3034	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3035	DEL_PTR(bGeom);
3036	}
3037	else
3038	{ // random decision
3039	nodeStack.push(bspNodePair(front, fGeom));
3040	nodeStack.push(bspNodePair(back, bGeom));
3041	}
3042	}
3043	}
3044
3045	DEL_PTR(geom);
3046	}
3047
3048	return (int)neighbors.size();
3049	}
3050
3051
3052
3053	int FromPointVisibilityTree::FindApproximateNeighbors(BspNode *n,
3054	vector<BspLeaf *> &neighbors,
3055	const bool onlyUnmailed) const
3056	{
3057	stack<bspNodePair> nodeStack;
3058
3059	BspNodeGeometry nodeGeom;
3060	ConstructGeometry(n, nodeGeom);
3061
3062	float eps = 0.01f;
3063	// split planes from the root to this node
3064	// needed to verify that we found neighbor leaf
3065	// TODO: really needed?
3066	vector<Plane3> halfSpaces;
3067	ExtractHalfSpaces(n, halfSpaces);
3068
3069
3070	BspNodeGeometry *rgeom = new BspNodeGeometry();
3071	ConstructGeometry(mRoot, *rgeom);
3072
3073	nodeStack.push(bspNodePair(mRoot, rgeom));
3074
3075	while (!nodeStack.empty())
3076	{
3077	BspNode *node = nodeStack.top().first;
3078	BspNodeGeometry *geom = nodeStack.top().second;
3079
3080	nodeStack.pop();
3081
3082	if (node->IsLeaf())
3083	{
3084	// test if this leaf is in valid view space
3085	if (node->TreeValid() &&
3086	(node != n) &&
3087	(!onlyUnmailed \|\| !node->Mailed()))
3088	{
3089	bool isAdjacent = true;
3090
3091	// neighbor was found
3092	if (isAdjacent)
3093	{
3094	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
3095	}
3096	}
3097	}
3098	else
3099	{
3100	BspInterior interior = dynamic_cast<BspInterior >(node);
3101
3102	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
3103	interior->GetPlane(),
3104	eps);
3105
3106	BspNode *front = interior->GetFront();
3107	BspNode *back = interior->GetBack();
3108
3109	BspNodeGeometry *fGeom = new BspNodeGeometry();
3110	BspNodeGeometry *bGeom = new BspNodeGeometry();
3111
3112	geom->SplitGeometry(*fGeom,
3113	*bGeom,
3114	interior->GetPlane(),
3115	mBox,
3116	//0.0000001f);
3117	eps);
3118
3119	if (cf == Polygon3::BACK_SIDE)
3120	{
3121	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
3122	DEL_PTR(fGeom);
3123	}
3124	else
3125	{
3126	if (cf == Polygon3::FRONT_SIDE)
3127	{
3128	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
3129	DEL_PTR(bGeom);
3130	}
3131	else
3132	{ // random decision
3133	nodeStack.push(bspNodePair(front, fGeom));
3134	nodeStack.push(bspNodePair(back, bGeom));
3135	}
3136	}
3137	}
3138
3139	DEL_PTR(geom);
3140	}
3141
3142	return (int)neighbors.size();
3143	}
3144
3145
3146
3147	BspLeaf *FromPointVisibilityTree::GetRandomLeaf(const Plane3 &halfspace)
3148	{
3149	stack<BspNode *> nodeStack;
3150	nodeStack.push(mRoot);
3151
3152	int mask = rand();
3153
3154	while (!nodeStack.empty())
3155	{
3156	BspNode *node = nodeStack.top();
3157	nodeStack.pop();
3158
3159	if (node->IsLeaf())
3160	{
3161	return dynamic_cast<BspLeaf *>(node);
3162	}
3163	else
3164	{
3165	BspInterior interior = dynamic_cast<BspInterior >(node);
3166	BspNode *next;
3167	BspNodeGeometry geom;
3168
3169	// todo: not very efficient: constructs full cell everytime
3170	ConstructGeometry(interior, geom);
3171
3172	const int cf =
3173	Polygon3::ClassifyPlane(geom.GetPolys(), halfspace, mEpsilon);
3174
3175	if (cf == Polygon3::BACK_SIDE)
3176	next = interior->GetFront();
3177	else
3178	if (cf == Polygon3::FRONT_SIDE)
3179	next = interior->GetFront();
3180	else
3181	{
3182	// random decision
3183	if (mask & 1)
3184	next = interior->GetBack();
3185	else
3186	next = interior->GetFront();
3187	mask = mask >> 1;
3188	}
3189
3190	nodeStack.push(next);
3191	}
3192	}
3193
3194	return NULL;
3195	}
3196
3197
3198	BspLeaf *FromPointVisibilityTree::GetRandomLeaf(const bool onlyUnmailed)
3199	{
3200	stack<BspNode *> nodeStack;
3201
3202	nodeStack.push(mRoot);
3203
3204	int mask = rand();
3205
3206	while (!nodeStack.empty())
3207	{
3208	BspNode *node = nodeStack.top();
3209	nodeStack.pop();
3210
3211	if (node->IsLeaf())
3212	{
3213	if ( (!onlyUnmailed \|\| !node->Mailed()) )
3214	return dynamic_cast<BspLeaf *>(node);
3215	}
3216	else
3217	{
3218	BspInterior interior = dynamic_cast<BspInterior >(node);
3219
3220	// random decision
3221	if (mask & 1)
3222	nodeStack.push(interior->GetBack());
3223	else
3224	nodeStack.push(interior->GetFront());
3225
3226	mask = mask >> 1;
3227	}
3228	}
3229
3230	return NULL;
3231	}
3232
3233
3234	int FromPointVisibilityTree::ComputePvsSize(const RayInfoContainer &rays) const
3235	{
3236	int pvsSize = 0;
3237
3238	RayInfoContainer::const_iterator rit, rit_end = rays.end();
3239
3240	Intersectable::NewMail();
3241
3242	for (rit = rays.begin(); rit != rays.end(); ++ rit)
3243	{
3244	VssRay ray = (rit).mRay;
3245
3246	if (ray->mOriginObject)
3247	{
3248	if (!ray->mOriginObject->Mailed())
3249	{
3250	ray->mOriginObject->Mail();
3251	++ pvsSize;
3252	}
3253	}
3254	if (ray->mTerminationObject)
3255	{
3256	if (!ray->mTerminationObject->Mailed())
3257	{
3258	ray->mTerminationObject->Mail();
3259	++ pvsSize;
3260	}
3261	}
3262	}
3263
3264	return pvsSize;
3265	}
3266
3267
3268	float FromPointVisibilityTree::GetEpsilon() const
3269	{
3270	return mEpsilon;
3271	}
3272
3273
3274	int FromPointVisibilityTree::SplitPolygons(const Plane3 &plane,
3275	PolygonContainer &polys,
3276	PolygonContainer &frontPolys,
3277	PolygonContainer &backPolys,
3278	PolygonContainer &coincident) const
3279	{
3280	int splits = 0;
3281
3282	PolygonContainer::const_iterator it, it_end = polys.end();
3283
3284	for (it = polys.begin(); it != polys.end(); ++ it)
3285	{
3286	Polygon3 poly = it;
3287
3288	// classify polygon
3289	const int cf = poly->ClassifyPlane(plane, mEpsilon);
3290
3291	switch (cf)
3292	{
3293	case Polygon3::COINCIDENT:
3294	coincident.push_back(poly);
3295	break;
3296	case Polygon3::FRONT_SIDE:
3297	frontPolys.push_back(poly);
3298	break;
3299	case Polygon3::BACK_SIDE:
3300	backPolys.push_back(poly);
3301	break;
3302	case Polygon3::SPLIT:
3303	backPolys.push_back(poly);
3304	frontPolys.push_back(poly);
3305	++ splits;
3306	break;
3307	default:
3308	Debug << "SHOULD NEVER COME HERE\n";
3309	break;
3310	}
3311	}
3312
3313	return splits;
3314	}
3315
3316
3317	int FromPointVisibilityTree::CastLineSegment(const Vector3 &origin,
3318	const Vector3 &termination,
3319	vector<ViewCell *> &viewcells)
3320	{
3321	int hits = 0;
3322	stack<BspRayTraversalData> tStack;
3323
3324	float mint = 0.0f, maxt = 1.0f;
3325
3326	Intersectable::NewMail();
3327	ViewCell::NewMail();
3328
3329	Vector3 entp = origin;
3330	Vector3 extp = termination;
3331
3332	BspNode *node = mRoot;
3333	BspNode *farChild = NULL;
3334
3335	float t;
3336	const float thresh = 1e-6f; // matt: change this to adjustable value
3337
3338	while (1)
3339	{
3340	if (!node->IsLeaf())
3341	{
3342	BspInterior in = dynamic_cast<BspInterior >(node);
3343
3344	Plane3 splitPlane = in->GetPlane();
3345
3346	const int entSide = splitPlane.Side(entp, thresh);
3347	const int extSide = splitPlane.Side(extp, thresh);
3348
3349	if (entSide < 0)
3350	{
3351	node = in->GetBack();
3352
3353	// plane does not split ray => no far child
3354	if (extSide <= 0)
3355	continue;
3356
3357	farChild = in->GetFront(); // plane splits ray
3358	}
3359	else if (entSide > 0)
3360	{
3361	node = in->GetFront();
3362
3363	if (extSide >= 0) // plane does not split ray => no far child
3364	continue;
3365
3366	farChild = in->GetBack(); // plane splits ray
3367	}
3368	else // one of the ray end points is on the plane
3369	{ // NOTE: what to do if ray is coincident with plane?
3370	if (extSide < 0)
3371	node = in->GetBack();
3372	else //if (extSide > 0)
3373	node = in->GetFront();
3374	//else break; // coincident => count no intersections
3375
3376	continue; // no far child
3377	}
3378
3379	// push data for far child
3380	tStack.push(BspRayTraversalData(farChild, extp));
3381
3382	// find intersection of ray segment with plane
3383	extp = splitPlane.FindIntersection(origin, extp, &t);
3384	}
3385	else
3386	{
3387	// reached leaf => intersection with view cell
3388	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3389	ViewCell *viewCell;
3390
3391	if (0)
3392	viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3393	else
3394	viewCell = leaf->GetViewCell();
3395
3396	if (!viewCell->Mailed())
3397	{
3398	viewcells.push_back(viewCell);
3399	viewCell->Mail();
3400	++ hits;
3401	}
3402
3403	//-- fetch the next far child from the stack
3404	if (tStack.empty())
3405	break;
3406
3407	entp = extp;
3408
3409	const BspRayTraversalData &s = tStack.top();
3410
3411	node = s.mNode;
3412	extp = s.mExitPoint;
3413
3414	tStack.pop();
3415	}
3416	}
3417
3418	return hits;
3419	}
3420
3421
3422
3423
3424	int FromPointVisibilityTree::TreeDistance(BspNode n1, BspNode n2) const
3425	{
3426	std::deque<BspNode *> path1;
3427	BspNode *p1 = n1;
3428
3429	// create path from node 1 to root
3430	while (p1)
3431	{
3432	if (p1 == n2) // second node on path
3433	return (int)path1.size();
3434
3435	path1.push_front(p1);
3436	p1 = p1->GetParent();
3437	}
3438
3439	int depth = n2->GetDepth();
3440	int d = depth;
3441
3442	BspNode *p2 = n2;
3443
3444	// compare with same depth
3445	while (1)
3446	{
3447	if ((d < (int)path1.size()) && (p2 == path1[d]))
3448	return (depth - d) + ((int)path1.size() - 1 - d);
3449
3450	-- d;
3451	p2 = p2->GetParent();
3452	}
3453
3454	return 0; // never come here
3455	}
3456
3457
3458	BspNode FromPointVisibilityTree::CollapseTree(BspNode node, int &collapsed)
3459	{
3460	// TODO
3461	#if HAS_TO_BE_REDONE
3462	if (node->IsLeaf())
3463	return node;
3464
3465	BspInterior interior = dynamic_cast<BspInterior >(node);
3466
3467	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
3468	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
3469
3470	if (front->IsLeaf() && back->IsLeaf())
3471	{
3472	BspLeaf frontLeaf = dynamic_cast<BspLeaf >(front);
3473	BspLeaf backLeaf = dynamic_cast<BspLeaf >(back);
3474
3475	//-- collapse tree
3476	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
3477	{
3478	BspViewCell *vc = frontLeaf->GetViewCell();
3479
3480	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
3481	leaf->SetTreeValid(frontLeaf->TreeValid());
3482
3483	// replace a link from node's parent
3484	if (leaf->GetParent())
3485	leaf->GetParent()->ReplaceChildLink(node, leaf);
3486	else
3487	mRoot = leaf;
3488
3489	++ collapsed;
3490	delete interior;
3491
3492	return leaf;
3493	}
3494	}
3495	#endif
3496	return node;
3497	}
3498
3499
3500	int FromPointVisibilityTree::CollapseTree()
3501	{
3502	int collapsed = 0;
3503	//TODO
3504	#if HAS_TO_BE_REDONE
3505	(void)CollapseTree(mRoot, collapsed);
3506
3507	// revalidate leaves
3508	RepairViewCellsLeafLists();
3509	#endif
3510	return collapsed;
3511	}
3512
3513
3514	void FromPointVisibilityTree::RepairViewCellsLeafLists()
3515	{
3516	// TODO
3517	#if HAS_TO_BE_REDONE
3518	// list not valid anymore => clear
3519	stack<BspNode *> nodeStack;
3520	nodeStack.push(mRoot);
3521
3522	ViewCell::NewMail();
3523
3524	while (!nodeStack.empty())
3525	{
3526	BspNode *node = nodeStack.top();
3527	nodeStack.pop();
3528
3529	if (node->IsLeaf())
3530	{
3531	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3532
3533	BspViewCell *viewCell = leaf->GetViewCell();
3534
3535	if (!viewCell->Mailed())
3536	{
3537	viewCell->mLeaves.clear();
3538	viewCell->Mail();
3539	}
3540
3541	viewCell->mLeaves.push_back(leaf);
3542
3543	}
3544	else
3545	{
3546	BspInterior interior = dynamic_cast<BspInterior >(node);
3547
3548	nodeStack.push(interior->GetFront());
3549	nodeStack.push(interior->GetBack());
3550	}
3551	}
3552	// TODO
3553	#endif
3554	}
3555
3556
3557	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
3558
3559
3560	int FromPointVisibilityTree::CastBeam(Beam &beam)
3561	{
3562	stack<bspNodePair> nodeStack;
3563	BspNodeGeometry *rgeom = new BspNodeGeometry();
3564	ConstructGeometry(mRoot, *rgeom);
3565
3566	nodeStack.push(bspNodePair(mRoot, rgeom));
3567
3568	ViewCell::NewMail();
3569
3570	while (!nodeStack.empty())
3571	{
3572	BspNode *node = nodeStack.top().first;
3573	BspNodeGeometry *geom = nodeStack.top().second;
3574	nodeStack.pop();
3575
3576	AxisAlignedBox3 box;
3577	geom->GetBoundingBox(box);
3578
3579	const int side = beam.ComputeIntersection(box);
3580
3581	switch (side)
3582	{
3583	case -1:
3584	CollectViewCells(node, true, beam.mViewCells, true);
3585	break;
3586	case 0:
3587
3588	if (node->IsLeaf())
3589	{
3590	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3591
3592	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
3593	{
3594	leaf->GetViewCell()->Mail();
3595	beam.mViewCells.push_back(leaf->GetViewCell());
3596	}
3597	}
3598	else
3599	{
3600	BspInterior interior = dynamic_cast<BspInterior >(node);
3601
3602	BspNode *first = interior->GetFront();
3603	BspNode *second = interior->GetBack();
3604
3605	BspNodeGeometry *firstGeom = new BspNodeGeometry();
3606	BspNodeGeometry *secondGeom = new BspNodeGeometry();
3607
3608	geom->SplitGeometry(*firstGeom,
3609	*secondGeom,
3610	interior->GetPlane(),
3611	mBox,
3612	//0.0000001f);
3613	mEpsilon);
3614
3615	// decide on the order of the nodes
3616	if (DotProd(beam.mPlanes[0].mNormal,
3617	interior->GetPlane().mNormal) > 0)
3618	{
3619	swap(first, second);
3620	swap(firstGeom, secondGeom);
3621	}
3622
3623	nodeStack.push(bspNodePair(first, firstGeom));
3624	nodeStack.push(bspNodePair(second, secondGeom));
3625	}
3626
3627	break;
3628	default:
3629	// default: cull
3630	break;
3631	}
3632
3633	DEL_PTR(geom);
3634
3635	}
3636
3637	return (int)beam.mViewCells.size();
3638	}
3639
3640
3641	void FromPointVisibilityTree::SetViewCellsManager(ViewCellsManager *vcm)
3642	{
3643	mViewCellsManager = vcm;
3644	}
3645
3646
3647	int FromPointVisibilityTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
3648	vector<MergeCandidate> &candidates)
3649	{
3650	BspLeaf::NewMail();
3651
3652	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
3653
3654	int numCandidates = 0;
3655
3656	// find merge candidates and push them into queue
3657	for (it = leaves.begin(); it != it_end; ++ it)
3658	{
3659	BspLeaf leaf = it;
3660
3661	// the same leaves must not be part of two merge candidates
3662	leaf->Mail();
3663
3664	vector<BspLeaf *> neighbors;
3665
3666	// appoximate neighbor search has slightl relaxed constraints
3667	if (1)
3668	FindNeighbors(leaf, neighbors, true);
3669	else
3670	FindApproximateNeighbors(leaf, neighbors, true);
3671
3672	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
3673
3674	// TODO: test if at least one ray goes from one leaf to the other
3675	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
3676	{
3677	if ((*nit)->GetViewCell() != leaf->GetViewCell())
3678	{
3679	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
3680
3681	// dont't merge view cells if they are empty and not front and back leaf of the same parent
3682	// in the tree?
3683	if (mEmptyViewCellsMergeAllowed \|\|
3684	!leaf->GetViewCell()->GetPvs().Empty() \|\|
3685	!(*nit)->GetViewCell()->GetPvs().Empty() \|\|
3686	leaf->IsSibling(*nit))
3687	{
3688	candidates.push_back(mc);
3689	}
3690
3691	++ numCandidates;
3692	if ((numCandidates % 1000) == 0)
3693	{
3694	cout << "collected " << numCandidates << " merge candidates" << endl;
3695	}
3696	}
3697	}
3698	}
3699
3700	Debug << "merge queue: " << (int)candidates.size() << endl;
3701	Debug << "leaves in queue: " << numCandidates << endl;
3702
3703
3704	return (int)leaves.size();
3705	}
3706
3707
3708	int FromPointVisibilityTree::CollectMergeCandidates(const VssRayContainer &rays,
3709	vector<MergeCandidate> &candidates)
3710	{
3711	ViewCell::NewMail();
3712	long startTime = GetTime();
3713
3714	map<BspLeaf , vector<BspLeaf> > neighborMap;
3715	ViewCellContainer::const_iterator iit;
3716
3717	int numLeaves = 0;
3718
3719	BspLeaf::NewMail();
3720
3721	for (int i = 0; i < (int)rays.size(); ++ i)
3722	{
3723	VssRay *ray = rays[i];
3724
3725	// traverse leaves stored in the rays and compare and
3726	// merge consecutive leaves (i.e., the neighbors in the tree)
3727	if (ray->mViewCells.size() < 2)
3728	continue;
3729	//TODO viewcellhierarchy
3730	iit = ray->mViewCells.begin();
3731	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
3732	BspLeaf *leaf = bspVc->mLeaf;
3733
3734	// traverse intersections
3735	// consecutive leaves are neighbors => add them to queue
3736	for (; iit != ray->mViewCells.end(); ++ iit)
3737	{
3738	// next pair
3739	BspLeaf *prevLeaf = leaf;
3740	bspVc = dynamic_cast<BspViewCell >(iit);
3741	leaf = bspVc->mLeaf;
3742
3743	// view space not valid or same view cell
3744	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3745	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3746	continue;
3747
3748	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3749
3750	bool found = false;
3751
3752	// both leaves inserted in queue already =>
3753	// look if double pair already exists
3754	if (leaf->Mailed() && prevLeaf->Mailed())
3755	{
3756	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3757
3758	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3759	if (*it == prevLeaf)
3760	found = true; // already in queue
3761	}
3762
3763	if (!found)
3764	{
3765	// this pair is not in map yet
3766	// => insert into the neighbor map and the queue
3767	neighbors.push_back(prevLeaf);
3768	neighborMap[prevLeaf].push_back(leaf);
3769
3770	leaf->Mail();
3771	prevLeaf->Mail();
3772
3773	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3774
3775	candidates.push_back(mc);
3776
3777	if (((int)candidates.size() % 1000) == 0)
3778	{
3779	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3780	}
3781	}
3782	}
3783	}
3784
3785	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3786	Debug << "merge queue: " << (int)candidates.size() << endl;
3787	Debug << "leaves in queue: " << numLeaves << endl;
3788
3789
3790	//-- collect the leaves which haven't been found by ray casting
3791	if (0)
3792	{
3793	cout << "finding additional merge candidates using geometry" << endl;
3794	vector<BspLeaf *> leaves;
3795	CollectLeaves(leaves, true);
3796	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3797	CollectMergeCandidates(leaves, candidates);
3798	}
3799
3800	return numLeaves;
3801	}
3802
3803
3804
3805
3806	ViewCell *FromPointVisibilityTree::GetViewCell(const Vector3 &point)
3807	{
3808	if (mRoot == NULL)
3809	return NULL;
3810
3811	stack<BspNode *> nodeStack;
3812	nodeStack.push(mRoot);
3813
3814	ViewCell *viewcell = NULL;
3815
3816	while (!nodeStack.empty()) {
3817	BspNode *node = nodeStack.top();
3818	nodeStack.pop();
3819
3820	if (node->IsLeaf()) {
3821	viewcell = dynamic_cast<BspLeaf *>(node)->GetViewCell();
3822	break;
3823	} else {
3824
3825	BspInterior interior = dynamic_cast<BspInterior >(node);
3826
3827	// random decision
3828	if (interior->GetPlane().Side(point) < 0)
3829	nodeStack.push(interior->GetBack());
3830	else
3831	nodeStack.push(interior->GetFront());
3832	}
3833	}
3834
3835	return viewcell;
3836	}
3837
3838
3839	bool FromPointVisibilityTree::ViewPointValid(const Vector3 &viewPoint) const
3840	{
3841	BspNode *node = mRoot;
3842
3843	while (1)
3844	{
3845	// early exit
3846	if (node->TreeValid())
3847	return true;
3848
3849	if (node->IsLeaf())
3850	return false;
3851
3852	BspInterior in = dynamic_cast<BspInterior >(node);
3853
3854	if (in->GetPlane().Side(viewPoint) <= 0)
3855	{
3856	node = in->GetBack();
3857	}
3858	else
3859	{
3860	node = in->GetFront();
3861	}
3862	}
3863
3864	// should never come here
3865	return false;
3866	}
3867
3868
3869	void FromPointVisibilityTree::PropagateUpValidity(BspNode *node)
3870	{
3871	const bool isValid = node->TreeValid();
3872
3873	// propagative up invalid flag until only invalid nodes exist over this node
3874	if (!isValid)
3875	{
3876	while (!node->IsRoot() && node->GetParent()->TreeValid())
3877	{
3878	node = node->GetParent();
3879	node->SetTreeValid(false);
3880	}
3881	}
3882	else
3883	{
3884	// propagative up valid flag until one of the subtrees is invalid
3885	while (!node->IsRoot() && !node->TreeValid())
3886	{
3887	node = node->GetParent();
3888	BspInterior interior = dynamic_cast<BspInterior >(node);
3889
3890	// the parent is valid iff both leaves are valid
3891	node->SetTreeValid(interior->GetBack()->TreeValid() &&
3892	interior->GetFront()->TreeValid());
3893	}
3894	}
3895	}
3896
3897
3898	bool FromPointVisibilityTree::Export(ofstream &stream)
3899	{
3900	ExportNode(mRoot, stream);
3901
3902	return true;
3903	}
3904
3905
3906	void FromPointVisibilityTree::ExportNode(BspNode *node, ofstream &stream)
3907	{
3908	if (node->IsLeaf())
3909	{
3910	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3911	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3912
3913	int id = -1;
3914	if (viewCell != mOutOfBoundsCell)
3915	id = viewCell->GetId();
3916
3917	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
3918	}
3919	else
3920	{
3921	BspInterior interior = dynamic_cast<BspInterior >(node);
3922
3923	Plane3 plane = interior->GetPlane();
3924	stream << "<Interior plane=\"" << plane.mNormal.x << " "
3925	<< plane.mNormal.y << " " << plane.mNormal.z << " "
3926	<< plane.mD << "\">" << endl;
3927
3928	ExportNode(interior->GetBack(), stream);
3929	ExportNode(interior->GetFront(), stream);
3930
3931	stream << "</Interior>" << endl;
3932	}
3933	}
3934
3935	}

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