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source: GTP/trunk/Lib/Vis/Preprocessing/src/VspBspTree.cpp @ 650

Revision 650, 76.0 KB checked in by mattausch, 18 years ago (diff)
added spatial hierarchy based merge tree

Line
1	#include <stack>
2	#include <time.h>
3	#include <iomanip>
4
5	#include "Plane3.h"
6	#include "VspBspTree.h"
7	#include "Mesh.h"
8	#include "common.h"
9	#include "ViewCell.h"
10	#include "Environment.h"
11	#include "Polygon3.h"
12	#include "Ray.h"
13	#include "AxisAlignedBox3.h"
14	#include "Exporter.h"
15	#include "Plane3.h"
16	#include "ViewCellBsp.h"
17	#include "ViewCellsManager.h"
18	#include "Beam.h"
19
20	#define USE_FIXEDPOINT_T 0
21
22
23	//-- static members
24
25	/** Evaluates split plane classification with respect to the plane's
26	contribution for a minimum number of ray splits.
27	*/
28	const float VspBspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0};
29	/** Evaluates split plane classification with respect to the plane's
30	contribution for balanced rays.
31	*/
32	const float VspBspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0};
33
34
35	int VspBspTree::sFrontId = 0;
36	int VspBspTree::sBackId = 0;
37	int VspBspTree::sFrontAndBackId = 0;
38
39
40
41
42	// pvs penalty can be different from pvs size
43	inline float EvalPvsPenalty(const int pvs,
44	const int lower,
45	const int upper)
46	{
47	// clamp to minmax values
48	if (pvs < lower)
49	return (float)lower;
50	if (pvs > upper)
51	return (float)upper;
52
53	return (float)pvs;
54	}
55
56
57
58
59	/******************************************************************************/
60	/* class VspBspTree implementation */
61	/******************************************************************************/
62
63
64	VspBspTree::VspBspTree():
65	mRoot(NULL),
66	mUseAreaForPvs(false),
67	mCostNormalizer(Limits::Small),
68	mViewCellsManager(NULL),
69	mOutOfBoundsCell(NULL),
70	mStoreRays(false),
71	mRenderCostWeight(0.5),
72	mUseRandomAxis(false),
73	mTimeStamp(1)
74	{
75	bool randomize = false;
76	environment->GetBoolValue("VspBspTree.Construction.randomize", randomize);
77	if (randomize)
78	Randomize(); // initialise random generator for heuristics
79
80	//-- termination criteria for autopartition
81	environment->GetIntValue("VspBspTree.Termination.maxDepth", mTermMaxDepth);
82	environment->GetIntValue("VspBspTree.Termination.minPvs", mTermMinPvs);
83	environment->GetIntValue("VspBspTree.Termination.minRays", mTermMinRays);
84	environment->GetFloatValue("VspBspTree.Termination.minProbability", mTermMinProbability);
85	environment->GetFloatValue("VspBspTree.Termination.maxRayContribution", mTermMaxRayContribution);
86	environment->GetFloatValue("VspBspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
87	environment->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
88	environment->GetIntValue("VspBspTree.Termination.missTolerance", mTermMissTolerance);
89	environment->GetIntValue("VspBspTree.Termination.maxViewCells", mMaxViewCells);
90	//-- max cost ratio for early tree termination
91	environment->GetFloatValue("VspBspTree.Termination.maxCostRatio", mTermMaxCostRatio);
92
93	// HACK
94	mTermMinPolygons = 25;
95
96	//-- factors for bsp tree split plane heuristics
97	environment->GetFloatValue("VspBspTree.Factor.balancedRays", mBalancedRaysFactor);
98	environment->GetFloatValue("VspBspTree.Factor.pvs", mPvsFactor);
99	environment->GetFloatValue("VspBspTree.Termination.ct_div_ci", mCtDivCi);
100
101
102	//-- partition criteria
103	environment->GetIntValue("VspBspTree.maxPolyCandidates", mMaxPolyCandidates);
104	environment->GetIntValue("VspBspTree.maxRayCandidates", mMaxRayCandidates);
105	environment->GetIntValue("VspBspTree.splitPlaneStrategy", mSplitPlaneStrategy);
106
107	environment->GetFloatValue("VspBspTree.Construction.epsilon", mEpsilon);
108	environment->GetIntValue("VspBspTree.maxTests", mMaxTests);
109
110	// if only the driving axis is used for axis aligned split
111	environment->GetBoolValue("VspBspTree.splitUseOnlyDrivingAxis", mOnlyDrivingAxis);
112
113	//-- termination criteria for axis aligned split
114	environment->GetFloatValue("VspBspTree.Termination.AxisAligned.maxRayContribution",
115	mTermMaxRayContriForAxisAligned);
116	environment->GetIntValue("VspBspTree.Termination.AxisAligned.minRays",
117	mTermMinRaysForAxisAligned);
118
119	//environment->GetFloatValue("VspBspTree.maxTotalMemory", mMaxTotalMemory);
120	environment->GetFloatValue("VspBspTree.maxStaticMemory", mMaxMemory);
121
122	environment->GetFloatValue("VspBspTree.Construction.renderCostWeight", mRenderCostWeight);
123
124	environment->GetBoolValue("VspBspTree.usePolygonSplitIfAvailable", mUsePolygonSplitIfAvailable);
125
126	mSubdivisionStats.open("subdivisionStats.log");
127
128	environment->GetBoolValue("VspBspTree.useCostHeuristics", mUseCostHeuristics);
129
130
131	//-- debug output
132
133	Debug << "***** VSP BSP options ****** " << endl;
134	Debug << "max depth: " << mTermMaxDepth << endl;
135	Debug << "min PVS: " << mTermMinPvs << endl;
136	Debug << "min probabiliy: " << mTermMinProbability << endl;
137	Debug << "min rays: " << mTermMinRays << endl;
138	Debug << "max ray contri: " << mTermMaxRayContribution << endl;
139	//Debug << "VSP BSP mininam accumulated ray lenght: ", mTermMinAccRayLength) << endl;
140	Debug << "max cost ratio: " << mTermMaxCostRatio << endl;
141	Debug << "miss tolerance: " << mTermMissTolerance << endl;
142	Debug << "max view cells: " << mMaxViewCells << endl;
143	Debug << "max polygon candidates: " << mMaxPolyCandidates << endl;
144	Debug << "max plane candidates: " << mMaxRayCandidates << endl;
145	Debug << "randomize: " << randomize << endl;
146
147	Debug << "using area for pvs: " << mUseAreaForPvs << endl;
148	Debug << "render cost weight: " << mRenderCostWeight << endl;
149	Debug << "Split plane strategy: ";
150
151	if (mSplitPlaneStrategy & RANDOM_POLYGON)
152	{
153	Debug << "random polygon ";
154	}
155	if (mSplitPlaneStrategy & AXIS_ALIGNED)
156	{
157	Debug << "axis aligned ";
158	}
159	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
160	{
161	mCostNormalizer += mLeastRaySplitsFactor;
162	Debug << "least ray splits ";
163	}
164	if (mSplitPlaneStrategy & BALANCED_RAYS)
165	{
166	mCostNormalizer += mBalancedRaysFactor;
167	Debug << "balanced rays ";
168	}
169	if (mSplitPlaneStrategy & PVS)
170	{
171	mCostNormalizer += mPvsFactor;
172	Debug << "pvs";
173	}
174
175
176	mSplitCandidates = new vector<SortableEntry>;
177
178	Debug << endl;
179	}
180
181
182	BspViewCell *VspBspTree::GetOutOfBoundsCell()
183	{
184	return mOutOfBoundsCell;
185	}
186
187
188	BspViewCell *VspBspTree::GetOrCreateOutOfBoundsCell()
189	{
190	if (!mOutOfBoundsCell)
191	{
192	mOutOfBoundsCell = new BspViewCell();
193	mOutOfBoundsCell->SetId(-1);
194	mOutOfBoundsCell->SetValid(false);
195	}
196
197	return mOutOfBoundsCell;
198	}
199
200
201	const BspTreeStatistics &VspBspTree::GetStatistics() const
202	{
203	return mBspStats;
204	}
205
206
207	VspBspTree::~VspBspTree()
208	{
209	DEL_PTR(mRoot);
210	DEL_PTR(mSplitCandidates);
211	}
212
213
214	int VspBspTree::AddMeshToPolygons(Mesh *mesh,
215	PolygonContainer &polys,
216	MeshInstance *parent)
217	{
218	FaceContainer::const_iterator fi;
219
220	// copy the face data to polygons
221	for (fi = mesh->mFaces.begin(); fi != mesh->mFaces.end(); ++ fi)
222	{
223	Polygon3 poly = new Polygon3((fi), mesh);
224
225	if (poly->Valid(mEpsilon))
226	{
227	poly->mParent = parent; // set parent intersectable
228	polys.push_back(poly);
229	}
230	else
231	DEL_PTR(poly);
232	}
233	return (int)mesh->mFaces.size();
234	}
235
236
237	int VspBspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
238	PolygonContainer &polys,
239	int maxObjects)
240	{
241	int limit = (maxObjects > 0) ?
242	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
243
244	int polysSize = 0;
245
246	for (int i = 0; i < limit; ++ i)
247	{
248	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
249	{
250	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
251	polysSize +=
252	AddMeshToPolygons(viewCells[i]->GetMesh(),
253	polys,
254	viewCells[i]);
255	}
256	}
257
258	return polysSize;
259	}
260
261
262	int VspBspTree::AddToPolygonSoup(const ObjectContainer &objects,
263	PolygonContainer &polys,
264	int maxObjects)
265	{
266	int limit = (maxObjects > 0) ?
267	Min((int)objects.size(), maxObjects) : (int)objects.size();
268
269	for (int i = 0; i < limit; ++i)
270	{
271	Intersectable object = objects[i];//it;
272	Mesh *mesh = NULL;
273
274	switch (object->Type()) // extract the meshes
275	{
276	case Intersectable::MESH_INSTANCE:
277	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
278	break;
279	case Intersectable::VIEW_CELL:
280	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
281	break;
282	// TODO: handle transformed mesh instances
283	default:
284	Debug << "intersectable type not supported" << endl;
285	break;
286	}
287
288	if (mesh) // copy the mesh data to polygons
289	{
290	mBox.Include(object->GetBox()); // add to BSP tree aabb
291	AddMeshToPolygons(mesh, polys, NULL);
292	}
293	}
294
295	return (int)polys.size();
296	}
297
298
299	void VspBspTree::Construct(const VssRayContainer &sampleRays,
300	AxisAlignedBox3 *forcedBoundingBox)
301	{
302	mBspStats.nodes = 1;
303	mBox.Initialize(); // initialise BSP tree bounding box
304
305	if (forcedBoundingBox)
306	mBox = *forcedBoundingBox;
307
308	PolygonContainer polys;
309	RayInfoContainer *rays = new RayInfoContainer();
310
311	VssRayContainer::const_iterator rit, rit_end = sampleRays.end();
312
313	long startTime = GetTime();
314
315	cout << "Extracting polygons from rays ... ";
316
317	Intersectable::NewMail();
318
319	int numObj = 0;
320
321	//-- extract polygons intersected by the rays
322	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
323	{
324	VssRay ray = rit;
325
326	if ((mBox.IsInside(ray->mTermination) \|\| !forcedBoundingBox) &&
327	ray->mTerminationObject &&
328	!ray->mTerminationObject->Mailed())
329	{
330	ray->mTerminationObject->Mail();
331	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mTerminationObject);
332	AddMeshToPolygons(obj->GetMesh(), polys, obj);
333	++ numObj;
334
335	//-- compute bounding box
336	if (!forcedBoundingBox)
337	mBox.Include(ray->mTermination);
338	}
339
340	if ((mBox.IsInside(ray->mOrigin) \|\| !forcedBoundingBox) &&
341	ray->mOriginObject &&
342	!ray->mOriginObject->Mailed())
343	{
344	ray->mOriginObject->Mail();
345	MeshInstance obj = dynamic_cast<MeshInstance >(ray->mOriginObject);
346	AddMeshToPolygons(obj->GetMesh(), polys, obj);
347	++ numObj;
348
349	//-- compute bounding box
350	if (!forcedBoundingBox)
351	mBox.Include(ray->mOrigin);
352	}
353	}
354
355	Debug << "maximal pvs (i.e., pvs still considered as valid) : " << mViewCellsManager->GetMaxPvsSize() << endl;
356
357	//-- store rays
358	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
359	{
360	VssRay ray = rit;
361
362	float minT, maxT;
363
364	static Ray hray;
365	hray.Init(*ray);
366
367	// TODO: not very efficient to implictly cast between rays types
368	if (mBox.GetRaySegment(hray, minT, maxT))
369	{
370	float len = ray->Length();
371
372	if (!len)
373	len = Limits::Small;
374
375	rays->push_back(RayInfo(ray, minT / len, maxT / len));
376	}
377	}
378
379	// normalize
380	if (mUseAreaForPvs)
381	mTermMinProbability *= mBox.SurfaceArea();
382	else
383	mTermMinProbability *= mBox.GetVolume();
384
385	// throw out unnecessary polygons
386	PreprocessPolygons(polys);
387
388	mBspStats.polys = (int)polys.size();
389
390	cout << "finished" << endl;
391
392	Debug << "\nPolygon extraction: " << (int)polys.size() << " polys extracted from "
393	<< (int)sampleRays.size() << " rays in "
394	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl << endl;
395
396	Construct(polys, rays);
397
398	// clean up polygons
399	CLEAR_CONTAINER(polys);
400	}
401
402
403	// TODO: return memory usage in MB
404	float VspBspTree::GetMemUsage(/const VspBspTraversalQueue &tstack/) const
405	{
406	return
407	(sizeof(VspBspTree) +
408	(float)mBspStats.Leaves() * sizeof(BspLeaf) +
409	// the nodes in the stack is the minimal additional number of leaves
410	//(float)tstack.size() * sizeof(BspLeaf) +
411	mBspStats.Interior() * sizeof(BspInterior) +
412	mBspStats.accumRays * sizeof(RayInfo)) / (1024.0f * 1024.0f);
413	}
414
415
416
417	void VspBspTree::Construct(const PolygonContainer &polys, RayInfoContainer *rays)
418	{
419	VspBspTraversalQueue tQueue;
420
421	mRoot = new BspLeaf();
422
423	// constrruct root node geometry
424	BspNodeGeometry *geom = new BspNodeGeometry();
425	ConstructGeometry(mRoot, *geom);
426
427	const float prop = mUseAreaForPvs ? geom->GetArea() : geom->GetVolume();
428
429	VspBspTraversalData tData(mRoot,
430	new PolygonContainer(polys),
431	0,
432	rays,
433	ComputePvsSize(*rays),
434	prop,
435	geom);
436	#if OCTREE_HACK
437	tData.mAxis = 0;
438	#endif
439	// first node is kd node, i.e. an axis aligned box
440	if (1)
441	tData.mIsKdNode = true;
442	else
443	tData.mIsKdNode = false;
444
445	tQueue.push(tData);
446
447
448	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
449	mTotalPvsSize = tData.mPvs;
450
451	mSubdivisionStats
452	<< "#ViewCells\n1\n" << endl
453	<< "#RenderCostDecrease\n0\n" << endl
454	<< "#TotalRenderCost\n" << mTotalCost << endl
455	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
456
457	Debug << "total cost: " << mTotalCost << endl;
458
459
460	mBspStats.Start();
461	cout << "Contructing vsp bsp tree ... \n";
462
463	long startTime = GetTime();
464	int nLeaves = 0;
465	int nViewCells = 0;
466
467	// used for intermediate time measurements and progress
468	long interTime = GetTime();
469
470	mOutOfMemory = false;
471
472	mCreatedViewCells = 0;
473
474	while (!tQueue.empty())
475	{
476	tData = tQueue.top();
477	tQueue.pop();
478
479	if (0 && !mOutOfMemory)
480	{
481	float mem = GetMemUsage();
482
483	if (mem > mMaxMemory)
484	{
485	mOutOfMemory = true;
486	Debug << "memory limit reached: " << mem << endl;
487	}
488	}
489
490	// subdivide leaf node
491	BspNode *r = Subdivide(tQueue, tData);
492
493	if (r == mRoot)
494	Debug << "VSP BSP tree construction time spent at root: "
495	<< TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
496
497	if (mBspStats.Leaves() == nLeaves)
498	{
499	nLeaves += 500;
500
501	cout << "leaves=" << mBspStats.Leaves() << endl;
502	Debug << "needed "
503	<< TimeDiff(interTime, GetTime())*1e-3
504	<< " secs to create 500 view cells" << endl;
505	interTime = GetTime();
506	}
507
508	if (mCreatedViewCells == nViewCells)
509	{
510	nViewCells += 500;
511
512	cout << "generated " << mCreatedViewCells << " viewcells" << endl;
513	}
514	}
515
516	Debug << "Used Memory: " << GetMemUsage() << " MB" << endl << endl;
517	cout << "finished\n";
518
519	mBspStats.Stop();
520	}
521
522
523	bool VspBspTree::TerminationCriteriaMet(const VspBspTraversalData &data) const
524	{
525	return
526	(((int)data.mRays->size() <= mTermMinRays) \|\|
527	(data.mPvs <= mTermMinPvs) \|\|
528	(data.mProbability <= mTermMinProbability) \|\|
529	(mBspStats.Leaves() >= mMaxViewCells) \|\|
530	#if 0
531	(((int)data.mPolygons->size() <= mTermMinPolygons) && !data.mPolygons->empty())\|\|
532	#endif
533	(data.GetAvgRayContribution() > mTermMaxRayContribution) \|\|
534	(data.mDepth >= mTermMaxDepth));
535	}
536
537
538	BspNode *VspBspTree::Subdivide(VspBspTraversalQueue &tQueue,
539	VspBspTraversalData &tData)
540	{
541	BspNode *newNode = tData.mNode;
542
543	if (!mOutOfMemory && !TerminationCriteriaMet(tData))
544	{
545	PolygonContainer coincident;
546
547	VspBspTraversalData tFrontData;
548	VspBspTraversalData tBackData;
549
550	#if OCTREE_HACK
551	//Debug << "new axis:" << (tData.mAxis + 1) % 3 << endl;
552	tFrontData.mAxis = (tData.mAxis + 1) % 3;
553	tBackData.mAxis = (tData.mAxis + 1) % 3;
554	#endif
555	// create new interior node and two leaf nodes
556	// or return leaf as it is (if maxCostRatio missed)
557	newNode = SubdivideNode(tData, tFrontData, tBackData, coincident);
558
559	if (!newNode->IsLeaf()) //-- continue subdivision
560	{
561	if (1)
562	{
563	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
564	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
565	float cData = (float)tData.mPvs * tData.mProbability;;
566
567	float costDecr =
568	(cFront + cBack - cData) / mBox.GetVolume();
569
570	mTotalCost += costDecr;
571	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - tData.mPvs;
572
573	mSubdivisionStats
574	<< "#ViewCells\n" << mBspStats.Leaves() << endl
575	<< "#RenderCostDecrease\n" << -costDecr << endl
576	<< "#TotalRenderCost\n" << mTotalCost << endl
577	<< "#AvgRenderCost\n" << (float)mTotalPvsSize / (float)mBspStats.Leaves() << endl;
578	}
579
580	// push the children on the stack
581	tQueue.push(tFrontData);
582	tQueue.push(tBackData);
583
584	// delete old leaf node
585	DEL_PTR(tData.mNode);
586	}
587	}
588
589	//-- terminate traversal and create new view cell
590	if (newNode->IsLeaf())
591	{
592	BspLeaf leaf = dynamic_cast<BspLeaf >(newNode);
593	BspViewCell *viewCell = new BspViewCell();
594
595	leaf->SetViewCell(viewCell);
596
597	//-- update pvs
598	int conSamp = 0;
599	float sampCon = 0.0f;
600	AddToPvs(leaf, *tData.mRays, sampCon, conSamp);
601
602	mBspStats.contributingSamples += conSamp;
603	mBspStats.sampleContributions +=(int) sampCon;
604
605	//-- store additional info
606	if (mStoreRays)
607	{
608	RayInfoContainer::const_iterator it, it_end = tData.mRays->end();
609	for (it = tData.mRays->begin(); it != it_end; ++ it)
610	{
611	(*it).mRay->Ref();
612	leaf->mVssRays.push_back((*it).mRay);
613	}
614	}
615
616	// should I check here?
617	if (0 && !mViewCellsManager->CheckValidity(viewCell, 0, mViewCellsManager->GetMaxPvsSize()))
618	{
619	viewCell->SetValid(false);
620	leaf->SetTreeValid(false);
621	PropagateUpValidity(leaf);
622
623	++ mBspStats.invalidLeaves;
624	}
625
626	viewCell->mLeaf = leaf;
627
628	if (mUseAreaForPvs)
629	viewCell->SetArea(tData.mProbability);
630	else
631	viewCell->SetVolume(tData.mProbability);
632
633	leaf->mProbability = tData.mProbability;
634
635	EvaluateLeafStats(tData);
636	}
637
638	//-- cleanup
639	tData.Clear();
640
641	return newNode;
642	}
643
644
645	BspNode *VspBspTree::SubdivideNode(VspBspTraversalData &tData,
646	VspBspTraversalData &frontData,
647	VspBspTraversalData &backData,
648	PolygonContainer &coincident)
649	{
650	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
651
652	// select subdivision plane
653	Plane3 splitPlane;
654
655	int maxCostMisses = tData.mMaxCostMisses;
656
657	int splitAxis;
658
659	const bool success =
660	SelectPlane(splitPlane, leaf, tData, frontData, backData, splitAxis);
661
662	if (!success)
663	{
664	++ maxCostMisses;
665
666	if (maxCostMisses > mTermMissTolerance)
667	{
668	// terminate branch because of max cost
669	++ mBspStats.maxCostNodes;
670	return leaf;
671	}
672	}
673
674	//! error also computed if cost ratio is missed
675	if (splitAxis < 3)
676	++ mBspStats.splits[splitAxis];
677	else
678	++ mBspStats.polySplits;
679
680	mBspStats.nodes += 2;
681
682	//-- subdivide further
683	BspInterior *interior = new BspInterior(splitPlane);
684
685	#ifdef _DEBUG
686	Debug << interior << endl;
687	#endif
688
689	//-- the front and back traversal data is filled with the new values
690	frontData.mDepth = tData.mDepth + 1;
691	frontData.mPolygons = new PolygonContainer();
692	frontData.mRays = new RayInfoContainer();
693
694	backData.mDepth = tData.mDepth + 1;
695	backData.mPolygons = new PolygonContainer();
696	backData.mRays = new RayInfoContainer();
697
698	// subdivide rays
699	SplitRays(interior->GetPlane(),
700	*tData.mRays,
701	*frontData.mRays,
702	*backData.mRays);
703
704	// subdivide polygons
705	SplitPolygons(interior->GetPlane(),
706	*tData.mPolygons,
707	*frontData.mPolygons,
708	*backData.mPolygons,
709	coincident);
710
711
712	// how often was max cost ratio missed in this branch?
713	frontData.mMaxCostMisses = maxCostMisses;
714	backData.mMaxCostMisses = maxCostMisses;
715
716	// compute pvs
717	frontData.mPvs = ComputePvsSize(*frontData.mRays);
718	backData.mPvs = ComputePvsSize(*backData.mRays);
719
720	// split front and back node geometry and compute area
721
722	// if geometry was not already computed
723	if (!frontData.mGeometry && !backData.mGeometry)
724	{
725	frontData.mGeometry = new BspNodeGeometry();
726	backData.mGeometry = new BspNodeGeometry();
727
728	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
729	*backData.mGeometry,
730	interior->GetPlane(),
731	mBox,
732	mEpsilon);
733
734	if (mUseAreaForPvs)
735	{
736	frontData.mProbability = frontData.mGeometry->GetArea();
737	backData.mProbability = backData.mGeometry->GetArea();
738	}
739	else
740	{
741	frontData.mProbability = frontData.mGeometry->GetVolume();
742	backData.mProbability = tData.mProbability - frontData.mProbability;
743	}
744	}
745
746
747	//-- create front and back leaf
748
749	BspInterior *parent = leaf->GetParent();
750
751	// replace a link from node's parent
752	if (parent)
753	{
754	parent->ReplaceChildLink(leaf, interior);
755	interior->SetParent(parent);
756	}
757	else // new root
758	{
759	mRoot = interior;
760	}
761
762	// and setup child links
763	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
764
765	frontData.mNode = interior->GetFront();
766	backData.mNode = interior->GetBack();
767
768	interior->mTimeStamp = mTimeStamp ++;
769	//frontData.mNode->mTimeStamp = ++ mTimeStamp;
770	//backData.mNode->mTimeStamp = mTimeStamp;
771
772	//DEL_PTR(leaf);
773	return interior;
774	}
775
776
777	void VspBspTree::AddToPvs(BspLeaf *leaf,
778	const RayInfoContainer &rays,
779	float &sampleContributions,
780	int &contributingSamples)
781	{
782	sampleContributions = 0;
783	contributingSamples = 0;
784
785	RayInfoContainer::const_iterator it, it_end = rays.end();
786
787	ViewCell *vc = leaf->GetViewCell();
788
789	// add contributions from samples to the PVS
790	for (it = rays.begin(); it != it_end; ++ it)
791	{
792	float sc = 0.0f;
793	VssRay ray = (it).mRay;
794	bool madeContrib = false;
795	float contribution;
796	if (ray->mTerminationObject) {
797	if (vc->GetPvs().AddSample(ray->mTerminationObject, ray->mPdf, contribution))
798	madeContrib = true;
799	sc += contribution;
800	}
801
802	if (ray->mOriginObject) {
803	if (vc->GetPvs().AddSample(ray->mOriginObject, ray->mPdf, contribution))
804	madeContrib = true;
805	sc += contribution;
806	}
807
808	sampleContributions += sc;
809	if (madeContrib)
810	++ contributingSamples;
811
812	//leaf->mVssRays.push_back(ray);
813	}
814	}
815
816
817	void VspBspTree::SortSplitCandidates(const RayInfoContainer &rays, const int axis)
818	{
819	mSplitCandidates->clear();
820
821	int requestedSize = 2 * (int)(rays.size());
822	// creates a sorted split candidates array
823	if (mSplitCandidates->capacity() > 500000 &&
824	requestedSize < (int)(mSplitCandidates->capacity() / 10) )
825	{
826	delete mSplitCandidates;
827	mSplitCandidates = new vector<SortableEntry>;
828	}
829
830	mSplitCandidates->reserve(requestedSize);
831
832	// insert all queries
833	for (RayInfoContainer::const_iterator ri = rays.begin(); ri < rays.end(); ++ ri)
834	{
835	const bool positive = (*ri).mRay->HasPosDir(axis);
836	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMin : SortableEntry::ERayMax,
837	(ri).ExtrapOrigin(axis), (ri).mRay));
838
839	mSplitCandidates->push_back(SortableEntry(positive ? SortableEntry::ERayMax : SortableEntry::ERayMin,
840	(ri).ExtrapTermination(axis), (ri).mRay));
841	}
842
843	stable_sort(mSplitCandidates->begin(), mSplitCandidates->end());
844	}
845
846
847	float VspBspTree::BestCostRatioHeuristics(const RayInfoContainer &rays,
848	const AxisAlignedBox3 &box,
849	const int pvsSize,
850	const int &axis,
851	float &position)
852	{
853	SortSplitCandidates(rays, axis);
854
855	// go through the lists, count the number of objects left and right
856	// and evaluate the following cost funcion:
857	// C = ct_div_ci + (qlrl + qrrr)/queries
858
859	int pvsl = 0, pvsr = pvsSize;
860
861	int pvsBack = pvsl;
862	int pvsFront = pvsr;
863
864	float minBox = box.Min(axis);
865	float maxBox = box.Max(axis);
866	float sizeBox = maxBox - minBox;
867
868	float minBand = minBox + 0.1f * (maxBox - minBox);
869	float maxBand = minBox + 0.9f * (maxBox - minBox);
870
871	float sum = (float)pvsSize * sizeBox;
872	float minSum = 1e20f;
873
874	Intersectable::NewMail();
875
876	RayInfoContainer::const_iterator ri, ri_end = rays.end();
877
878	// set all object as belonging to the front pvs
879	for(ri = rays.begin(); ri != ri_end; ++ ri)
880	{
881	Intersectable oObject = (ri).mRay->mOriginObject;
882	Intersectable tObject = (ri).mRay->mTerminationObject;
883
884	if (oObject)
885	{
886	if (!oObject->Mailed())
887	{
888	oObject->Mail();
889	oObject->mCounter = 1;
890	}
891	else
892	{
893	++ oObject->mCounter;
894	}
895	}
896	if (tObject)
897	{
898	if (!tObject->Mailed())
899	{
900	tObject->Mail();
901	tObject->mCounter = 1;
902	}
903	else
904	{
905	++ tObject->mCounter;
906	}
907	}
908	}
909
910	Intersectable::NewMail();
911
912	vector<SortableEntry>::const_iterator ci, ci_end = mSplitCandidates->end();
913
914	for (ci = mSplitCandidates->begin(); ci < ci_end; ++ ci)
915	{
916	VssRay *ray;
917	ray = (*ci).ray;
918
919	Intersectable *oObject = ray->mOriginObject;
920	Intersectable *tObject = ray->mTerminationObject;
921
922
923	switch ((*ci).type)
924	{
925	case SortableEntry::ERayMin:
926	{
927	if (oObject && !oObject->Mailed())
928	{
929	oObject->Mail();
930	++ pvsl;
931	}
932	if (tObject && !tObject->Mailed())
933	{
934	tObject->Mail();
935	++ pvsl;
936	}
937	break;
938	}
939	case SortableEntry::ERayMax:
940	{
941	if (oObject)
942	{
943	if (-- oObject->mCounter == 0)
944	-- pvsr;
945	}
946
947	if (tObject)
948	{
949	if (-- tObject->mCounter == 0)
950	-- pvsr;
951	}
952
953	break;
954	}
955	}
956
957	// Note: sufficient to compare size of bounding boxes of front and back side?
958	if ((ci).value > minBand && (ci).value < maxBand)
959	{
960	sum = pvsl * ((ci).value - minBox) + pvsr (maxBox - (*ci).value);
961
962	// cout<<"pos="<<(*ci).value<<"\t q=("<<ql<<","<<qr<<")\t r=("<<rl<<","<<rr<<")"<<endl;
963	// cout<<"cost= "<<sum<<endl;
964
965	if (sum < minSum)
966	{
967	minSum = sum;
968	position = (*ci).value;
969
970	pvsBack = pvsl;
971	pvsFront = pvsr;
972	}
973	}
974	}
975
976	// -- compute cost
977
978	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
979	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
980
981	const float pOverall = sizeBox;
982
983	const float pBack = position - minBox;
984	const float pFront = maxBox - position;
985
986	const float penaltyOld = EvalPvsPenalty(pvsSize, lowerPvsLimit, upperPvsLimit);
987	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
988	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
989
990	const float oldRenderCost = penaltyOld * pOverall;
991	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
992
993	float ratio = mPvsFactor * newRenderCost / (oldRenderCost + Limits::Small);
994
995	//Debug << "costRatio=" << ratio << " pos=" << position << " t=" << (position - minBox) / (maxBox - minBox)
996	// <<"\t q=(" << queriesBack << "," << queriesFront << ")\t r=(" << raysBack << "," << raysFront << ")" << endl;
997
998	return ratio;
999	}
1000
1001
1002	float VspBspTree::SelectAxisAlignedPlane(Plane3 &plane,
1003	const VspBspTraversalData &tData,
1004	int &axis,
1005	BspNodeGeometry **frontGeom,
1006	BspNodeGeometry **backGeom,
1007	float &pFront,
1008	float &pBack,
1009	const bool useKdSplit)
1010	{
1011	float nPosition[3];
1012	float nCostRatio[3];
1013	float nProbFront[3];
1014	float nProbBack[3];
1015
1016	BspNodeGeometry *nFrontGeom[3];
1017	BspNodeGeometry *nBackGeom[3];
1018
1019	for (int i = 0; i < 3; ++ i)
1020	{
1021	nFrontGeom[i] = NULL;
1022	nBackGeom[i] = NULL;
1023	}
1024
1025	int bestAxis = -1;
1026
1027	// create bounding box of node geometry
1028	AxisAlignedBox3 box;
1029	box.Initialize();
1030
1031	//TODO: for kd split geometry already is box => only take minmax vertices
1032	if (1)
1033	{
1034	PolygonContainer::const_iterator it, it_end = tData.mGeometry->mPolys.end();
1035
1036	for(it = tData.mGeometry->mPolys.begin(); it < it_end; ++ it)
1037	box.Include((it));
1038	}
1039	else
1040	{
1041	RayInfoContainer::const_iterator ri, ri_end = tData.mRays->end();
1042
1043	for(ri = tData.mRays->begin(); ri < ri_end; ++ ri)
1044	box.Include((*ri).ExtrapTermination());
1045	}
1046	#if OCTREE_HACK
1047	//Debug << "choosing axis:" << tData.mAxis << endl;
1048	const int sAxis = tData.mAxis;
1049	#else
1050	const int sAxis = mUseRandomAxis ? Random(3) : box.Size().DrivingAxis();
1051	#endif
1052	for (axis = 0; axis < 3; ++ axis)
1053	{
1054	if (!mOnlyDrivingAxis \|\| (axis == sAxis))
1055	{
1056	if (!mUseCostHeuristics)
1057	{
1058	nFrontGeom[axis] = new BspNodeGeometry();
1059	nBackGeom[axis] = new BspNodeGeometry();
1060
1061	nPosition[axis] = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
1062	Vector3 normal(0,0,0); normal[axis] = 1.0f;
1063
1064	// allows faster split because we have axis aligned kd tree boxes
1065	if (useKdSplit)
1066	{
1067	nCostRatio[axis] = EvalAxisAlignedSplitCost(tData,
1068	box,
1069	axis,
1070	nPosition[axis],
1071	nProbFront[axis],
1072	nProbBack[axis]);
1073
1074	Vector3 pos;
1075
1076	pos = box.Max(); pos[axis] = nPosition[axis];
1077	AxisAlignedBox3 bBox(box.Min(), pos);
1078	bBox.ExtractPolys(nBackGeom[axis]->mPolys);
1079
1080	pos = box.Min(); pos[axis] = nPosition[axis];
1081	AxisAlignedBox3 fBox(pos, box.Max());
1082	fBox.ExtractPolys(nFrontGeom[axis]->mPolys);
1083	}
1084	else
1085	{
1086	nCostRatio[axis] =
1087	EvalSplitPlaneCost(Plane3(normal, nPosition[axis]),
1088	tData, nFrontGeom[axis], nBackGeom[axis],
1089	nProbFront[axis], nProbBack[axis]);
1090	}
1091	}
1092	else
1093	{
1094	nCostRatio[axis] =
1095	BestCostRatioHeuristics(*tData.mRays,
1096	box,
1097	tData.mPvs,
1098	axis,
1099	nPosition[axis]);
1100	}
1101
1102	if (bestAxis == -1)
1103	{
1104	bestAxis = axis;
1105	}
1106	else if (nCostRatio[axis] < nCostRatio[bestAxis])
1107	{
1108	bestAxis = axis;
1109	}
1110
1111	}
1112	}
1113
1114	//-- assign values
1115	axis = bestAxis;
1116	pFront = nProbFront[bestAxis];
1117	pBack = nProbBack[bestAxis];
1118
1119	// assign best split nodes geometry
1120	*frontGeom = nFrontGeom[bestAxis];
1121	*backGeom = nBackGeom[bestAxis];
1122
1123	// and delete other geometry
1124	DEL_PTR(nFrontGeom[(bestAxis + 1) % 3]);
1125	DEL_PTR(nBackGeom[(bestAxis + 2) % 3]);
1126
1127	//-- split plane
1128	Vector3 normal(0,0,0); normal[bestAxis] = 1;
1129	plane = Plane3(normal, nPosition[bestAxis]);
1130
1131	return nCostRatio[bestAxis];
1132	}
1133
1134
1135	bool VspBspTree::SelectPlane(Plane3 &bestPlane,
1136	BspLeaf *leaf,
1137	VspBspTraversalData &data,
1138	VspBspTraversalData &frontData,
1139	VspBspTraversalData &backData,
1140	int &splitAxis)
1141	{
1142	// simplest strategy: just take next polygon
1143	if (mSplitPlaneStrategy & RANDOM_POLYGON)
1144	{
1145	if (!data.mPolygons->empty())
1146	{
1147	const int randIdx =
1148	(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1));
1149	Polygon3 nextPoly = (data.mPolygons)[randIdx];
1150
1151	bestPlane = nextPoly->GetSupportingPlane();
1152	return true;
1153	}
1154	}
1155
1156	//-- use heuristics to find appropriate plane
1157
1158	// intermediate plane
1159	Plane3 plane;
1160	float lowestCost = MAX_FLOAT;
1161
1162	// decides if the first few splits should be only axisAligned
1163	const bool onlyAxisAligned =
1164	(mSplitPlaneStrategy & AXIS_ALIGNED) &&
1165	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
1166	((int)data.GetAvgRayContribution() < mTermMaxRayContriForAxisAligned);
1167
1168	const int limit = onlyAxisAligned ? 0 :
1169	Min((int)data.mPolygons->size(), mMaxPolyCandidates);
1170
1171	float candidateCost;
1172
1173	int maxIdx = (int)data.mPolygons->size();
1174
1175	for (int i = 0; i < limit; ++ i)
1176	{
1177	// the already taken candidates are stored behind maxIdx
1178	// => assure that no index is taken twice
1179	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
1180	Polygon3 poly = (data.mPolygons)[candidateIdx];
1181
1182	// swap candidate to the end to avoid testing same plane
1183	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
1184	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
1185
1186	// evaluate current candidate
1187	BspNodeGeometry fGeom, bGeom;
1188	float fArea, bArea;
1189	plane = poly->GetSupportingPlane();
1190	candidateCost = EvalSplitPlaneCost(plane, data, fGeom, bGeom, fArea, bArea);
1191
1192	if (candidateCost < lowestCost)
1193	{
1194	bestPlane = plane;
1195	lowestCost = candidateCost;
1196	}
1197	}
1198
1199	// cost ratio miss
1200	if (mUsePolygonSplitIfAvailable && !data.mPolygons->empty())
1201	{
1202	frontData.mIsKdNode = backData.mIsKdNode = false;
1203	if (lowestCost > mTermMaxCostRatio)
1204	return false;
1205
1206	return true;
1207	}
1208
1209	//-- evaluate axis aligned splits
1210	int axis;
1211	BspNodeGeometry fGeom, bGeom;
1212	float pFront, pBack;
1213
1214	candidateCost = SelectAxisAlignedPlane(plane,
1215	data,
1216	axis,
1217	&fGeom,
1218	&bGeom,
1219	pFront,
1220	pBack,
1221	data.mIsKdNode);
1222
1223	splitAxis = 3;
1224
1225	if (candidateCost < lowestCost)
1226	{
1227	bestPlane = plane;
1228	lowestCost = candidateCost;
1229	splitAxis = axis;
1230	// assign already computed values
1231	// we can do this because we always save the
1232	// computed values from the axis aligned splits
1233	if (fGeom && bGeom)
1234	{
1235	frontData.mGeometry = fGeom;
1236	backData.mGeometry = bGeom;
1237
1238	frontData.mProbability = pFront;
1239	backData.mProbability = pBack;
1240	}
1241	}
1242	else
1243	{
1244	DEL_PTR(fGeom);
1245	DEL_PTR(bGeom);
1246	}
1247
1248	frontData.mIsKdNode = backData.mIsKdNode =
1249	(data.mIsKdNode && splitAxis < 3);
1250
1251	#ifdef _DEBUG
1252	Debug << "plane lowest cost: " << lowestCost << endl;
1253	#endif
1254
1255	// cost ratio miss
1256	if (lowestCost > mTermMaxCostRatio)
1257	{
1258	return false;
1259	}
1260
1261	return true;
1262	}
1263
1264
1265	Plane3 VspBspTree::ChooseCandidatePlane(const RayInfoContainer &rays) const
1266	{
1267	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1268
1269	const Vector3 minPt = rays[candidateIdx].ExtrapOrigin();
1270	const Vector3 maxPt = rays[candidateIdx].ExtrapTermination();
1271
1272	const Vector3 pt = (maxPt + minPt) * 0.5;
1273	const Vector3 normal = Normalize(rays[candidateIdx].mRay->GetDir());
1274
1275	return Plane3(normal, pt);
1276	}
1277
1278
1279	Plane3 VspBspTree::ChooseCandidatePlane2(const RayInfoContainer &rays) const
1280	{
1281	Vector3 pt[3];
1282
1283	int idx[3];
1284	int cmaxT = 0;
1285	int cminT = 0;
1286	bool chooseMin = false;
1287
1288	for (int j = 0; j < 3; ++ j)
1289	{
1290	idx[j] = (int)RandomValue(0, (Real)((int)rays.size() * 2 - 1));
1291
1292	if (idx[j] >= (int)rays.size())
1293	{
1294	idx[j] -= (int)rays.size();
1295
1296	chooseMin = (cminT < 2);
1297	}
1298	else
1299	chooseMin = (cmaxT < 2);
1300
1301	RayInfo rayInf = rays[idx[j]];
1302	pt[j] = chooseMin ? rayInf.ExtrapOrigin() : rayInf.ExtrapTermination();
1303	}
1304
1305	return Plane3(pt[0], pt[1], pt[2]);
1306	}
1307
1308
1309	Plane3 VspBspTree::ChooseCandidatePlane3(const RayInfoContainer &rays) const
1310	{
1311	Vector3 pt[3];
1312
1313	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1314	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
1315
1316	// check if rays different
1317	if (idx1 == idx2)
1318	idx2 = (idx2 + 1) % (int)rays.size();
1319
1320	const RayInfo ray1 = rays[idx1];
1321	const RayInfo ray2 = rays[idx2];
1322
1323	// normal vector of the plane parallel to both lines
1324	const Vector3 norm = Normalize(CrossProd(ray1.mRay->GetDir(), ray2.mRay->GetDir()));
1325
1326	// vector from line 1 to line 2
1327	const Vector3 vd = ray2.ExtrapOrigin() - ray1.ExtrapOrigin();
1328
1329	// project vector on normal to get distance
1330	const float dist = DotProd(vd, norm);
1331
1332	// point on plane lies halfway between the two planes
1333	const Vector3 planePt = ray1.ExtrapOrigin() + norm * dist * 0.5;
1334
1335	return Plane3(norm, planePt);
1336	}
1337
1338
1339	inline void VspBspTree::GenerateUniqueIdsForPvs()
1340	{
1341	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
1342	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
1343	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
1344	}
1345
1346
1347	float VspBspTree::EvalSplitPlaneCost(const Plane3 &candidatePlane,
1348	const VspBspTraversalData &data,
1349	BspNodeGeometry &geomFront,
1350	BspNodeGeometry &geomBack,
1351	float &pFront,
1352	float &pBack) const
1353	{
1354	float cost = 0;
1355
1356	float sumBalancedRays = 0;
1357	float sumRaySplits = 0;
1358
1359	int pvsFront = 0;
1360	int pvsBack = 0;
1361
1362	// probability that view point lies in back / front node
1363	float pOverall = 0;
1364	pFront = 0;
1365	pBack = 0;
1366
1367	int raysFront = 0;
1368	int raysBack = 0;
1369	int totalPvs = 0;
1370
1371	int limit;
1372	bool useRand;
1373
1374	// choose test rays randomly if too much
1375	if ((int)data.mRays->size() > mMaxTests)
1376	{
1377	useRand = true;
1378	limit = mMaxTests;
1379	}
1380	else
1381	{
1382	useRand = false;
1383	limit = (int)data.mRays->size();
1384	}
1385
1386	for (int i = 0; i < limit; ++ i)
1387	{
1388	const int testIdx = useRand ?
1389	(int)RandomValue(0, (Real)((int)data.mRays->size() - 1)) : i;
1390	RayInfo rayInf = (*data.mRays)[testIdx];
1391
1392	float t;
1393	VssRay *ray = rayInf.mRay;
1394	const int cf = rayInf.ComputeRayIntersection(candidatePlane, t);
1395
1396	if (0)
1397	{
1398	if (cf >= 0)
1399	++ raysFront;
1400	if (cf <= 0)
1401	++ raysBack;
1402	}
1403
1404	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
1405	{
1406	sumBalancedRays += cf;
1407	}
1408
1409	if (mSplitPlaneStrategy & BALANCED_RAYS)
1410	{
1411	if (cf == 0)
1412	++ sumRaySplits;
1413	}
1414
1415	if (mSplitPlaneStrategy & PVS)
1416	{
1417	// find front and back pvs for origing and termination object
1418	AddObjToPvs(ray->mTerminationObject, cf, pvsFront, pvsBack, totalPvs);
1419	AddObjToPvs(ray->mOriginObject, cf, pvsFront, pvsBack, totalPvs);
1420	}
1421	}
1422
1423	const float raysSize = (float)data.mRays->size() + Limits::Small;
1424
1425	if (mSplitPlaneStrategy & PVS)
1426	{
1427	// create unique ids for pvs heuristics
1428	GenerateUniqueIdsForPvs();
1429
1430	// construct child geometry with regard to the candidate split plane
1431	data.mGeometry->SplitGeometry(geomFront,
1432	geomBack,
1433	candidatePlane,
1434	mBox,
1435	mEpsilon);
1436
1437	pOverall = data.mProbability;
1438
1439	if (!mUseAreaForPvs) // use front and back cell areas to approximate volume
1440	{
1441	pFront = geomFront.GetVolume();
1442	pBack = pOverall - pFront;
1443	}
1444	else
1445	{
1446	pFront = geomFront.GetArea();
1447	pBack = geomBack.GetArea();
1448	}
1449	}
1450
1451
1452	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
1453	cost += mLeastRaySplitsFactor * sumRaySplits / raysSize;
1454
1455	if (mSplitPlaneStrategy & BALANCED_RAYS)
1456	cost += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize;
1457
1458	// -- pvs rendering heuristics
1459	if (mSplitPlaneStrategy & PVS)
1460	{
1461	const int lowerPvsLimit = mViewCellsManager->GetMinPvsSize();
1462	const int upperPvsLimit = mViewCellsManager->GetMaxPvsSize();
1463
1464	// only render cost heuristics or combined with standard deviation
1465	const float penaltyOld = EvalPvsPenalty(totalPvs, lowerPvsLimit, upperPvsLimit);
1466	const float penaltyFront = EvalPvsPenalty(pvsFront, lowerPvsLimit, upperPvsLimit);
1467	const float penaltyBack = EvalPvsPenalty(pvsBack, lowerPvsLimit, upperPvsLimit);
1468
1469	const float oldRenderCost = pOverall * penaltyOld;
1470	const float newRenderCost = penaltyFront * pFront + penaltyBack * pBack;
1471
1472	float oldCost, newCost;
1473
1474	// only render cost
1475	if (1)
1476	{
1477	oldCost = oldRenderCost;
1478	newCost = newRenderCost;
1479	}
1480	else // also considering standard deviation
1481	{
1482	// standard deviation is difference of back and front pvs
1483	const float expectedCost = 0.5f * (penaltyFront + penaltyBack);
1484
1485	const float newDeviation = 0.5f *
1486	fabs(penaltyFront - expectedCost) + fabs(penaltyBack - expectedCost);
1487
1488	const float oldDeviation = penaltyOld;
1489
1490	newCost = mRenderCostWeight * newRenderCost + (1.0f - mRenderCostWeight) * newDeviation;
1491	oldCost = mRenderCostWeight * oldRenderCost + (1.0f - mRenderCostWeight) * oldDeviation;
1492	}
1493
1494	cost += mPvsFactor * newCost / (oldCost + Limits::Small);
1495
1496	}
1497
1498	#ifdef _DEBUG
1499	Debug << "totalpvs: " << data.mPvs << " ptotal: " << pOverall
1500	<< " frontpvs: " << pvsFront << " pFront: " << pFront
1501	<< " backpvs: " << pvsBack << " pBack: " << pBack << endl << endl;
1502	Debug << "cost: " << cost << endl;
1503	#endif
1504
1505
1506	// normalize cost by sum of linear factors
1507	if(0)
1508	return cost / (float)mCostNormalizer;
1509	else
1510	return cost;
1511	}
1512
1513
1514	float VspBspTree::EvalAxisAlignedSplitCost(const VspBspTraversalData &data,
1515	const AxisAlignedBox3 &box,
1516	const int axis,
1517	const float &position,
1518	float &pFront,
1519	float &pBack) const
1520	{
1521	int pvsTotal = 0;
1522	int pvsFront = 0;
1523	int pvsBack = 0;
1524
1525	// create unique ids for pvs heuristics
1526	GenerateUniqueIdsForPvs();
1527
1528	const int pvsSize = data.mPvs;
1529
1530	RayInfoContainer::const_iterator rit, rit_end = data.mRays->end();
1531
1532	// this is the main ray classification loop!
1533	for(rit = data.mRays->begin(); rit != rit_end; ++ rit)
1534	{
1535	//if (!(*rit).mRay->IsActive()) continue;
1536
1537	// determine the side of this ray with respect to the plane
1538	float t;
1539	const int side = (*rit).ComputeRayIntersection(axis, position, t);
1540
1541	AddObjToPvs((*rit).mRay->mTerminationObject, side, pvsFront, pvsBack, pvsTotal);
1542	AddObjToPvs((*rit).mRay->mOriginObject, side, pvsFront, pvsBack, pvsTotal);
1543	}
1544
1545	//-- pvs heuristics
1546	float pOverall;
1547
1548	//-- compute heurstics
1549	// we take simplified computation for mid split
1550
1551	pOverall = data.mProbability;
1552
1553	if (!mUseAreaForPvs)
1554	{ // volume
1555	pBack = pFront = pOverall * 0.5f;
1556
1557	#if 0
1558	// box length substitute for probability
1559	const float minBox = box.Min(axis);
1560	const float maxBox = box.Max(axis);
1561
1562	pBack = position - minBox;
1563	pFront = maxBox - position;
1564	pOverall = maxBox - minBox;
1565	#endif
1566	}
1567	else //-- area substitute for probability
1568	{
1569	const int axis2 = (axis + 1) % 3;
1570	const int axis3 = (axis + 2) % 3;
1571
1572	const float faceArea =
1573	(box.Max(axis2) - box.Min(axis2)) *
1574	(box.Max(axis3) - box.Min(axis3));
1575
1576	pBack = pFront = pOverall * 0.5f + faceArea;
1577	}
1578
1579	#ifdef _DEBUG
1580	Debug << axis << " " << pvsSize << " " << pvsBack << " " << pvsFront << endl;
1581	Debug << pFront << " " << pBack << " " << pOverall << endl;
1582	#endif
1583
1584
1585	const float newCost = pvsBack * pBack + pvsFront * pFront;
1586	const float oldCost = (float)pvsSize * pOverall + Limits::Small;
1587
1588	return (mCtDivCi + newCost) / oldCost;
1589	}
1590
1591
1592	void VspBspTree::AddObjToPvs(Intersectable *obj,
1593	const int cf,
1594	int &frontPvs,
1595	int &backPvs,
1596	int &totalPvs) const
1597	{
1598	if (!obj)
1599	return;
1600
1601	if ((obj->mMailbox != sFrontId) &&
1602	(obj->mMailbox != sBackId) &&
1603	(obj->mMailbox != sFrontAndBackId))
1604	{
1605	++ totalPvs;
1606	}
1607
1608	// TODO: does this really belong to no pvs?
1609	//if (cf == Ray::COINCIDENT) return;
1610
1611	// object belongs to both PVS
1612	if (cf >= 0)
1613	{
1614	if ((obj->mMailbox != sFrontId) &&
1615	(obj->mMailbox != sFrontAndBackId))
1616	{
1617	++ frontPvs;
1618
1619	if (obj->mMailbox == sBackId)
1620	obj->mMailbox = sFrontAndBackId;
1621	else
1622	obj->mMailbox = sFrontId;
1623	}
1624	}
1625
1626	if (cf <= 0)
1627	{
1628	if ((obj->mMailbox != sBackId) &&
1629	(obj->mMailbox != sFrontAndBackId))
1630	{
1631	++ backPvs;
1632
1633	if (obj->mMailbox == sFrontId)
1634	obj->mMailbox = sFrontAndBackId;
1635	else
1636	obj->mMailbox = sBackId;
1637	}
1638	}
1639	}
1640
1641
1642	void VspBspTree::CollectLeaves(vector<BspLeaf *> &leaves,
1643	const bool onlyUnmailed,
1644	const int maxPvsSize) const
1645	{
1646	stack<BspNode *> nodeStack;
1647	nodeStack.push(mRoot);
1648
1649	while (!nodeStack.empty())
1650	{
1651	BspNode *node = nodeStack.top();
1652	nodeStack.pop();
1653
1654	if (node->IsLeaf())
1655	{
1656	// test if this leaf is in valid view space
1657	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
1658	if (leaf->TreeValid() &&
1659	(!onlyUnmailed \|\| !leaf->Mailed()) &&
1660	((maxPvsSize < 0) \|\| (leaf->GetViewCell()->GetPvs().GetSize() <= maxPvsSize)))
1661	{
1662	leaves.push_back(leaf);
1663	}
1664	}
1665	else
1666	{
1667	BspInterior interior = dynamic_cast<BspInterior >(node);
1668
1669	nodeStack.push(interior->GetBack());
1670	nodeStack.push(interior->GetFront());
1671	}
1672	}
1673	}
1674
1675
1676	AxisAlignedBox3 VspBspTree::GetBoundingBox() const
1677	{
1678	return mBox;
1679	}
1680
1681
1682	BspNode *VspBspTree::GetRoot() const
1683	{
1684	return mRoot;
1685	}
1686
1687
1688	void VspBspTree::EvaluateLeafStats(const VspBspTraversalData &data)
1689	{
1690	// the node became a leaf -> evaluate stats for leafs
1691	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
1692
1693	// store maximal and minimal depth
1694	if (data.mDepth > mBspStats.maxDepth)
1695	mBspStats.maxDepth = data.mDepth;
1696
1697	if (data.mPvs > mBspStats.maxPvs)
1698	mBspStats.maxPvs = data.mPvs;
1699
1700	if (data.mDepth < mBspStats.minDepth)
1701	mBspStats.minDepth = data.mDepth;
1702
1703	if (data.mDepth >= mTermMaxDepth)
1704	++ mBspStats.maxDepthNodes;
1705
1706	// accumulate rays to compute rays / leaf
1707	mBspStats.accumRays += (int)data.mRays->size();
1708
1709	if (data.mPvs < mTermMinPvs)
1710	++ mBspStats.minPvsNodes;
1711
1712	if ((int)data.mRays->size() < mTermMinRays)
1713	++ mBspStats.minRaysNodes;
1714
1715	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
1716	++ mBspStats.maxRayContribNodes;
1717
1718	if (data.mProbability <= mTermMinProbability)
1719	++ mBspStats.minProbabilityNodes;
1720
1721	// accumulate depth to compute average depth
1722	mBspStats.accumDepth += data.mDepth;
1723
1724	++ mCreatedViewCells;
1725	#ifdef _DEBUG
1726	Debug << "BSP stats: "
1727	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
1728	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
1729	// << "Area: " << data.mProbability << " (min: " << mTermMinProbability << "), "
1730	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
1731	<< "#pvs: " << leaf->GetViewCell()->GetPvs().GetSize() << "=, "
1732	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
1733	#endif
1734	}
1735
1736
1737	int VspBspTree::CastRay(Ray &ray)
1738	{
1739	int hits = 0;
1740
1741	stack<BspRayTraversalData> tQueue;
1742
1743	float maxt, mint;
1744
1745	if (!mBox.GetRaySegment(ray, mint, maxt))
1746	return 0;
1747
1748	Intersectable::NewMail();
1749	ViewCell::NewMail();
1750	Vector3 entp = ray.Extrap(mint);
1751	Vector3 extp = ray.Extrap(maxt);
1752
1753	BspNode *node = mRoot;
1754	BspNode *farChild = NULL;
1755
1756	while (1)
1757	{
1758	if (!node->IsLeaf())
1759	{
1760	BspInterior in = dynamic_cast<BspInterior >(node);
1761
1762	Plane3 splitPlane = in->GetPlane();
1763	const int entSide = splitPlane.Side(entp);
1764	const int extSide = splitPlane.Side(extp);
1765
1766	if (entSide < 0)
1767	{
1768	node = in->GetBack();
1769
1770	if(extSide <= 0) // plane does not split ray => no far child
1771	continue;
1772
1773	farChild = in->GetFront(); // plane splits ray
1774
1775	} else if (entSide > 0)
1776	{
1777	node = in->GetFront();
1778
1779	if (extSide >= 0) // plane does not split ray => no far child
1780	continue;
1781
1782	farChild = in->GetBack(); // plane splits ray
1783	}
1784	else // ray and plane are coincident
1785	{
1786	// WHAT TO DO IN THIS CASE ?
1787	//break;
1788	node = in->GetFront();
1789	continue;
1790	}
1791
1792	// push data for far child
1793	tQueue.push(BspRayTraversalData(farChild, extp, maxt));
1794
1795	// find intersection of ray segment with plane
1796	float t;
1797	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
1798	maxt *= t;
1799
1800	} else // reached leaf => intersection with view cell
1801	{
1802	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
1803
1804	if (!leaf->GetViewCell()->Mailed())
1805	{
1806	//ray.bspIntersections.push_back(Ray::VspBspIntersection(maxt, leaf));
1807	leaf->GetViewCell()->Mail();
1808	++ hits;
1809	}
1810
1811	//-- fetch the next far child from the stack
1812	if (tQueue.empty())
1813	break;
1814
1815	entp = extp;
1816	mint = maxt; // NOTE: need this?
1817
1818	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
1819	break;
1820
1821	BspRayTraversalData &s = tQueue.top();
1822
1823	node = s.mNode;
1824	extp = s.mExitPoint;
1825	maxt = s.mMaxT;
1826
1827	tQueue.pop();
1828	}
1829	}
1830
1831	return hits;
1832	}
1833
1834
1835	void VspBspTree::CollectViewCells(ViewCellContainer &viewCells, bool onlyValid) const
1836	{
1837	ViewCell::NewMail();
1838
1839	CollectViewCells(mRoot, onlyValid, viewCells, true);
1840	}
1841
1842
1843	void VspBspTree::CollapseViewCells()
1844	{
1845	// TODO
1846	#if VC_HISTORY
1847	stack<BspNode *> nodeStack;
1848
1849	if (!mRoot)
1850	return;
1851
1852	nodeStack.push(mRoot);
1853
1854	while (!nodeStack.empty())
1855	{
1856	BspNode *node = nodeStack.top();
1857	nodeStack.pop();
1858
1859	if (node->IsLeaf())
1860	{
1861	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
1862
1863	if (!viewCell->GetValid())
1864	{
1865	BspViewCell viewCell = dynamic_cast<BspLeaf >(node)->GetViewCell();
1866
1867	ViewCellContainer leaves;
1868	mViewCellsTree->CollectLeaves(viewCell, leaves);
1869
1870	ViewCellContainer::const_iterator it, it_end = leaves.end();
1871
1872	for (it = leaves.begin(); it != it_end; ++ it)
1873	{
1874	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
1875	l->SetViewCell(GetOrCreateOutOfBoundsCell());
1876	++ mBspStats.invalidLeaves;
1877	}
1878
1879	// add to unbounded view cell
1880	GetOrCreateOutOfBoundsCell()->GetPvs().AddPvs(viewCell->GetPvs());
1881	DEL_PTR(viewCell);
1882	}
1883	}
1884	else
1885	{
1886	BspInterior interior = dynamic_cast<BspInterior >(node);
1887
1888	nodeStack.push(interior->GetFront());
1889	nodeStack.push(interior->GetBack());
1890	}
1891	}
1892
1893	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
1894	#endif
1895	}
1896
1897
1898	void VspBspTree::CollectRays(VssRayContainer &rays)
1899	{
1900	vector<BspLeaf *> leaves;
1901
1902	vector<BspLeaf *>::const_iterator lit, lit_end = leaves.end();
1903
1904	for (lit = leaves.begin(); lit != lit_end; ++ lit)
1905	{
1906	BspLeaf leaf = lit;
1907	VssRayContainer::const_iterator rit, rit_end = leaf->mVssRays.end();
1908
1909	for (rit = leaf->mVssRays.begin(); rit != rit_end; ++ rit)
1910	rays.push_back(*rit);
1911	}
1912	}
1913
1914
1915	void VspBspTree::ValidateTree()
1916	{
1917	stack<BspNode *> nodeStack;
1918
1919	if (!mRoot)
1920	return;
1921
1922	nodeStack.push(mRoot);
1923
1924	mBspStats.invalidLeaves = 0;
1925	while (!nodeStack.empty())
1926	{
1927	BspNode *node = nodeStack.top();
1928	nodeStack.pop();
1929
1930	if (node->IsLeaf())
1931	{
1932	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
1933
1934	if (!leaf->GetViewCell()->GetValid())
1935	++ mBspStats.invalidLeaves;
1936
1937	// validity flags don't match => repair
1938	if (leaf->GetViewCell()->GetValid() != leaf->TreeValid())
1939	{
1940	leaf->SetTreeValid(leaf->GetViewCell()->GetValid());
1941	PropagateUpValidity(leaf);
1942	}
1943	}
1944	else
1945	{
1946	BspInterior interior = dynamic_cast<BspInterior >(node);
1947
1948	nodeStack.push(interior->GetFront());
1949	nodeStack.push(interior->GetBack());
1950	}
1951	}
1952
1953	Debug << "invalid leaves: " << mBspStats.invalidLeaves << endl;
1954	}
1955
1956
1957
1958	void VspBspTree::CollectViewCells(BspNode *root,
1959	bool onlyValid,
1960	ViewCellContainer &viewCells,
1961	bool onlyUnmailed) const
1962	{
1963	stack<BspNode *> nodeStack;
1964
1965	if (!root)
1966	return;
1967
1968	nodeStack.push(root);
1969
1970	while (!nodeStack.empty())
1971	{
1972	BspNode *node = nodeStack.top();
1973	nodeStack.pop();
1974
1975	if (node->IsLeaf())
1976	{
1977	if (!onlyValid \|\| node->TreeValid())
1978	{
1979	ViewCell *viewCell =
1980	mViewCellsTree->GetActiveViewCell(dynamic_cast<BspLeaf *>(node)->GetViewCell());
1981
1982	if (!onlyUnmailed \|\| !viewCell->Mailed())
1983	{
1984	viewCell->Mail();
1985	viewCells.push_back(viewCell);
1986	}
1987	}
1988	}
1989	else
1990	{
1991	BspInterior interior = dynamic_cast<BspInterior >(node);
1992
1993	nodeStack.push(interior->GetFront());
1994	nodeStack.push(interior->GetBack());
1995	}
1996	}
1997
1998	}
1999
2000
2001	void VspBspTree::PreprocessPolygons(PolygonContainer &polys)
2002	{
2003	// preprocess: throw out polygons coincident to the view space box (not needed)
2004	PolygonContainer boxPolys;
2005	mBox.ExtractPolys(boxPolys);
2006	vector<Plane3> boxPlanes;
2007
2008	PolygonContainer::iterator pit, pit_end = boxPolys.end();
2009
2010	// extract planes of box
2011	// TODO: can be done more elegantly than first extracting polygons
2012	// and take their planes
2013	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
2014	{
2015	boxPlanes.push_back((*pit)->GetSupportingPlane());
2016	}
2017
2018	pit_end = polys.end();
2019
2020	for (pit = polys.begin(); pit != pit_end; ++ pit)
2021	{
2022	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
2023
2024	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
2025	{
2026	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
2027
2028	if (cf == Polygon3::COINCIDENT)
2029	{
2030	DEL_PTR(*pit);
2031	//Debug << "coincident!!" << endl;
2032	}
2033	}
2034	}
2035
2036	// remove deleted entries
2037	for (int i = 0; i < (int)polys.size(); ++ i)
2038	{
2039	while (!polys[i] && (i < (int)polys.size()))
2040	{
2041	swap(polys[i], polys.back());
2042	polys.pop_back();
2043	}
2044	}
2045	}
2046
2047
2048	float VspBspTree::AccumulatedRayLength(const RayInfoContainer &rays) const
2049	{
2050	float len = 0;
2051
2052	RayInfoContainer::const_iterator it, it_end = rays.end();
2053
2054	for (it = rays.begin(); it != it_end; ++ it)
2055	len += (*it).SegmentLength();
2056
2057	return len;
2058	}
2059
2060
2061	int VspBspTree::SplitRays(const Plane3 &plane,
2062	RayInfoContainer &rays,
2063	RayInfoContainer &frontRays,
2064	RayInfoContainer &backRays) const
2065	{
2066	int splits = 0;
2067
2068	RayInfoContainer::const_iterator it, it_end = rays.end();
2069
2070	for (it = rays.begin(); it != it_end; ++ it)
2071	{
2072	RayInfo bRay = *it;
2073
2074	VssRay *ray = bRay.mRay;
2075	float t;
2076
2077	// get classification and receive new t
2078	const int cf = bRay.ComputeRayIntersection(plane, t);
2079
2080	switch (cf)
2081	{
2082	case -1:
2083	backRays.push_back(bRay);
2084	break;
2085	case 1:
2086	frontRays.push_back(bRay);
2087	break;
2088	case 0:
2089	{
2090	//-- split ray
2091	// test if start point behind or in front of plane
2092	const int side = plane.Side(bRay.ExtrapOrigin());
2093
2094	if (side <= 0)
2095	{
2096	backRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2097	frontRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2098	}
2099	else
2100	{
2101	frontRays.push_back(RayInfo(ray, bRay.GetMinT(), t));
2102	backRays.push_back(RayInfo(ray, t, bRay.GetMaxT()));
2103	}
2104	}
2105	break;
2106	default:
2107	Debug << "Should not come here" << endl;
2108	break;
2109	}
2110	}
2111
2112	return splits;
2113	}
2114
2115
2116	void VspBspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
2117	{
2118	BspNode *lastNode;
2119
2120	do
2121	{
2122	lastNode = n;
2123
2124	// want to get planes defining geometry of this node => don't take
2125	// split plane of node itself
2126	n = n->GetParent();
2127
2128	if (n)
2129	{
2130	BspInterior interior = dynamic_cast<BspInterior >(n);
2131	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
2132
2133	if (interior->GetFront() != lastNode)
2134	halfSpace.ReverseOrientation();
2135
2136	halfSpaces.push_back(halfSpace);
2137	}
2138	}
2139	while (n);
2140	}
2141
2142
2143	void VspBspTree::ConstructGeometry(BspNode *n,
2144	BspNodeGeometry &geom) const
2145	{
2146	vector<Plane3> halfSpaces;
2147	ExtractHalfSpaces(n, halfSpaces);
2148
2149	PolygonContainer candidatePolys;
2150
2151	// bounded planes are added to the polygons (reverse polygons
2152	// as they have to be outfacing
2153	for (int i = 0; i < (int)halfSpaces.size(); ++ i)
2154	{
2155	Polygon3 *p = GetBoundingBox().CrossSection(halfSpaces[i]);
2156
2157	if (p->Valid(mEpsilon))
2158	{
2159	candidatePolys.push_back(p->CreateReversePolygon());
2160	DEL_PTR(p);
2161	}
2162	}
2163
2164	// add faces of bounding box (also could be faces of the cell)
2165	for (int i = 0; i < 6; ++ i)
2166	{
2167	VertexContainer vertices;
2168
2169	for (int j = 0; j < 4; ++ j)
2170	vertices.push_back(mBox.GetFace(i).mVertices[j]);
2171
2172	candidatePolys.push_back(new Polygon3(vertices));
2173	}
2174
2175	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
2176	{
2177	// polygon is split by all other planes
2178	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
2179	{
2180	if (i == j) // polygon and plane are coincident
2181	continue;
2182
2183	VertexContainer splitPts;
2184	Polygon3 frontPoly, backPoly;
2185
2186	const int cf =
2187	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
2188	mEpsilon);
2189
2190	switch (cf)
2191	{
2192	case Polygon3::SPLIT:
2193	frontPoly = new Polygon3();
2194	backPoly = new Polygon3();
2195
2196	candidatePolys[i]->Split(halfSpaces[j],
2197	*frontPoly,
2198	*backPoly,
2199	mEpsilon);
2200
2201	DEL_PTR(candidatePolys[i]);
2202
2203	if (frontPoly->Valid(mEpsilon))
2204	candidatePolys[i] = frontPoly;
2205	else
2206	DEL_PTR(frontPoly);
2207
2208	DEL_PTR(backPoly);
2209	break;
2210	case Polygon3::BACK_SIDE:
2211	DEL_PTR(candidatePolys[i]);
2212	break;
2213	// just take polygon as it is
2214	case Polygon3::FRONT_SIDE:
2215	case Polygon3::COINCIDENT:
2216	default:
2217	break;
2218	}
2219	}
2220
2221	if (candidatePolys[i])
2222	geom.mPolys.push_back(candidatePolys[i]);
2223	}
2224	}
2225
2226
2227	void VspBspTree::ConstructGeometry(ViewCell *vc,
2228	BspNodeGeometry &vcGeom) const
2229	{
2230	ViewCellContainer leaves;
2231
2232	mViewCellsTree->CollectLeaves(vc, leaves);
2233
2234	ViewCellContainer::const_iterator it, it_end = leaves.end();
2235
2236	for (it = leaves.begin(); it != it_end; ++ it)
2237	{
2238	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
2239
2240	ConstructGeometry(l, vcGeom);
2241	}
2242	}
2243
2244
2245	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
2246
2247
2248	int VspBspTree::FindNeighbors(BspNode n, vector<BspLeaf > &neighbors,
2249	const bool onlyUnmailed) const
2250	{
2251	stack<bspNodePair> nodeStack;
2252
2253	BspNodeGeometry nodeGeom;
2254	ConstructGeometry(n, nodeGeom);
2255
2256	// split planes from the root to this node
2257	// needed to verify that we found neighbor leaf
2258	// TODO: really needed?
2259	vector<Plane3> halfSpaces;
2260	ExtractHalfSpaces(n, halfSpaces);
2261
2262
2263	BspNodeGeometry *rgeom = new BspNodeGeometry();
2264	ConstructGeometry(mRoot, *rgeom);
2265
2266	nodeStack.push(bspNodePair(mRoot, rgeom));
2267
2268	while (!nodeStack.empty())
2269	{
2270	BspNode *node = nodeStack.top().first;
2271	BspNodeGeometry *geom = nodeStack.top().second;
2272
2273	nodeStack.pop();
2274
2275	if (node->IsLeaf())
2276	{
2277	// test if this leaf is in valid view space
2278	if (node->TreeValid() &&
2279	(node != n) &&
2280	(!onlyUnmailed \|\| !node->Mailed()))
2281	{
2282	bool isAdjacent = true;
2283
2284	if (1)
2285	{
2286	// test all planes of current node if still adjacent
2287	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
2288	{
2289	const int cf =
2290	Polygon3::ClassifyPlane(geom->mPolys,
2291	halfSpaces[i],
2292	mEpsilon);
2293
2294	if (cf == Polygon3::BACK_SIDE)
2295	{
2296	isAdjacent = false;
2297	}
2298	}
2299	}
2300	else
2301	{
2302	// TODO: why is this wrong??
2303	// test all planes of current node if still adjacent
2304	for (int i = 0; (i < (int)nodeGeom.mPolys.size()) && isAdjacent; ++ i)
2305	{
2306	Polygon3 *poly = nodeGeom.mPolys[i];
2307
2308	const int cf =
2309	Polygon3::ClassifyPlane(geom->mPolys,
2310	poly->GetSupportingPlane(),
2311	mEpsilon);
2312
2313	if (cf == Polygon3::BACK_SIDE)
2314	{
2315	isAdjacent = false;
2316	}
2317	}
2318	}
2319	// neighbor was found
2320	if (isAdjacent)
2321	{
2322	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
2323	}
2324	}
2325	}
2326	else
2327	{
2328	BspInterior interior = dynamic_cast<BspInterior >(node);
2329
2330	const int cf = Polygon3::ClassifyPlane(nodeGeom.mPolys,
2331	interior->GetPlane(),
2332	mEpsilon);
2333
2334	BspNode *front = interior->GetFront();
2335	BspNode *back = interior->GetBack();
2336
2337	BspNodeGeometry *fGeom = new BspNodeGeometry();
2338	BspNodeGeometry *bGeom = new BspNodeGeometry();
2339
2340	geom->SplitGeometry(*fGeom,
2341	*bGeom,
2342	interior->GetPlane(),
2343	mBox,
2344	mEpsilon);
2345
2346	if (cf == Polygon3::FRONT_SIDE)
2347	{
2348	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
2349	DEL_PTR(bGeom);
2350	}
2351	else
2352	{
2353	if (cf == Polygon3::BACK_SIDE)
2354	{
2355	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
2356	DEL_PTR(fGeom);
2357	}
2358	else
2359	{ // random decision
2360	nodeStack.push(bspNodePair(front, fGeom));
2361	nodeStack.push(bspNodePair(back, bGeom));
2362	}
2363	}
2364	}
2365
2366	DEL_PTR(geom);
2367	}
2368
2369	return (int)neighbors.size();
2370	}
2371
2372
2373
2374	int VspBspTree::FindApproximateNeighbors(BspNode n, vector<BspLeaf > &neighbors,
2375	const bool onlyUnmailed) const
2376	{
2377	stack<bspNodePair> nodeStack;
2378
2379	BspNodeGeometry nodeGeom;
2380	ConstructGeometry(n, nodeGeom);
2381
2382	// split planes from the root to this node
2383	// needed to verify that we found neighbor leaf
2384	// TODO: really needed?
2385	vector<Plane3> halfSpaces;
2386	ExtractHalfSpaces(n, halfSpaces);
2387
2388
2389	BspNodeGeometry *rgeom = new BspNodeGeometry();
2390	ConstructGeometry(mRoot, *rgeom);
2391
2392	nodeStack.push(bspNodePair(mRoot, rgeom));
2393
2394	while (!nodeStack.empty())
2395	{
2396	BspNode *node = nodeStack.top().first;
2397	BspNodeGeometry *geom = nodeStack.top().second;
2398
2399	nodeStack.pop();
2400
2401	if (node->IsLeaf())
2402	{
2403	// test if this leaf is in valid view space
2404	if (node->TreeValid() &&
2405	(node != n) &&
2406	(!onlyUnmailed \|\| !node->Mailed()))
2407	{
2408	bool isAdjacent = true;
2409
2410	// neighbor was found
2411	if (isAdjacent)
2412	{
2413	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
2414	}
2415	}
2416	}
2417	else
2418	{
2419	BspInterior interior = dynamic_cast<BspInterior >(node);
2420
2421	const int cf = Polygon3::ClassifyPlane(nodeGeom.mPolys,
2422	interior->GetPlane(),
2423	mEpsilon);
2424
2425	BspNode *front = interior->GetFront();
2426	BspNode *back = interior->GetBack();
2427
2428	BspNodeGeometry *fGeom = new BspNodeGeometry();
2429	BspNodeGeometry *bGeom = new BspNodeGeometry();
2430
2431	geom->SplitGeometry(*fGeom,
2432	*bGeom,
2433	interior->GetPlane(),
2434	mBox,
2435	mEpsilon);
2436
2437	if (cf == Polygon3::FRONT_SIDE)
2438	{
2439	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
2440	DEL_PTR(bGeom);
2441	}
2442	else
2443	{
2444	if (cf == Polygon3::BACK_SIDE)
2445	{
2446	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
2447	DEL_PTR(fGeom);
2448	}
2449	else
2450	{ // random decision
2451	nodeStack.push(bspNodePair(front, fGeom));
2452	nodeStack.push(bspNodePair(back, bGeom));
2453	}
2454	}
2455	}
2456
2457	DEL_PTR(geom);
2458	}
2459
2460	return (int)neighbors.size();
2461	}
2462
2463
2464
2465	BspLeaf *VspBspTree::GetRandomLeaf(const Plane3 &halfspace)
2466	{
2467	stack<BspNode *> nodeStack;
2468	nodeStack.push(mRoot);
2469
2470	int mask = rand();
2471
2472	while (!nodeStack.empty())
2473	{
2474	BspNode *node = nodeStack.top();
2475	nodeStack.pop();
2476
2477	if (node->IsLeaf())
2478	{
2479	return dynamic_cast<BspLeaf *>(node);
2480	}
2481	else
2482	{
2483	BspInterior interior = dynamic_cast<BspInterior >(node);
2484	BspNode *next;
2485	BspNodeGeometry geom;
2486
2487	// todo: not very efficient: constructs full cell everytime
2488	ConstructGeometry(interior, geom);
2489
2490	const int cf =
2491	Polygon3::ClassifyPlane(geom.mPolys, halfspace, mEpsilon);
2492
2493	if (cf == Polygon3::BACK_SIDE)
2494	next = interior->GetFront();
2495	else
2496	if (cf == Polygon3::FRONT_SIDE)
2497	next = interior->GetFront();
2498	else
2499	{
2500	// random decision
2501	if (mask & 1)
2502	next = interior->GetBack();
2503	else
2504	next = interior->GetFront();
2505	mask = mask >> 1;
2506	}
2507
2508	nodeStack.push(next);
2509	}
2510	}
2511
2512	return NULL;
2513	}
2514
2515	BspLeaf *VspBspTree::GetRandomLeaf(const bool onlyUnmailed)
2516	{
2517	stack<BspNode *> nodeStack;
2518
2519	nodeStack.push(mRoot);
2520
2521	int mask = rand();
2522
2523	while (!nodeStack.empty())
2524	{
2525	BspNode *node = nodeStack.top();
2526	nodeStack.pop();
2527
2528	if (node->IsLeaf())
2529	{
2530	if ( (!onlyUnmailed \|\| !node->Mailed()) )
2531	return dynamic_cast<BspLeaf *>(node);
2532	}
2533	else
2534	{
2535	BspInterior interior = dynamic_cast<BspInterior >(node);
2536
2537	// random decision
2538	if (mask & 1)
2539	nodeStack.push(interior->GetBack());
2540	else
2541	nodeStack.push(interior->GetFront());
2542
2543	mask = mask >> 1;
2544	}
2545	}
2546
2547	return NULL;
2548	}
2549
2550	int VspBspTree::ComputePvsSize(const RayInfoContainer &rays) const
2551	{
2552	int pvsSize = 0;
2553
2554	RayInfoContainer::const_iterator rit, rit_end = rays.end();
2555
2556	Intersectable::NewMail();
2557
2558	for (rit = rays.begin(); rit != rays.end(); ++ rit)
2559	{
2560	VssRay ray = (rit).mRay;
2561
2562	if (ray->mOriginObject)
2563	{
2564	if (!ray->mOriginObject->Mailed())
2565	{
2566	ray->mOriginObject->Mail();
2567	++ pvsSize;
2568	}
2569	}
2570	if (ray->mTerminationObject)
2571	{
2572	if (!ray->mTerminationObject->Mailed())
2573	{
2574	ray->mTerminationObject->Mail();
2575	++ pvsSize;
2576	}
2577	}
2578	}
2579
2580	return pvsSize;
2581	}
2582
2583	float VspBspTree::GetEpsilon() const
2584	{
2585	return mEpsilon;
2586	}
2587
2588
2589	int VspBspTree::SplitPolygons(const Plane3 &plane,
2590	PolygonContainer &polys,
2591	PolygonContainer &frontPolys,
2592	PolygonContainer &backPolys,
2593	PolygonContainer &coincident) const
2594	{
2595	int splits = 0;
2596
2597	PolygonContainer::const_iterator it, it_end = polys.end();
2598
2599	for (it = polys.begin(); it != polys.end(); ++ it)
2600	{
2601	Polygon3 poly = it;
2602
2603	// classify polygon
2604	const int cf = poly->ClassifyPlane(plane, mEpsilon);
2605
2606	switch (cf)
2607	{
2608	case Polygon3::COINCIDENT:
2609	coincident.push_back(poly);
2610	break;
2611	case Polygon3::FRONT_SIDE:
2612	frontPolys.push_back(poly);
2613	break;
2614	case Polygon3::BACK_SIDE:
2615	backPolys.push_back(poly);
2616	break;
2617	case Polygon3::SPLIT:
2618	backPolys.push_back(poly);
2619	frontPolys.push_back(poly);
2620	++ splits;
2621	break;
2622	default:
2623	Debug << "SHOULD NEVER COME HERE\n";
2624	break;
2625	}
2626	}
2627
2628	return splits;
2629	}
2630
2631
2632	int VspBspTree::CastLineSegment(const Vector3 &origin,
2633	const Vector3 &termination,
2634	vector<ViewCell *> &viewcells)
2635	{
2636	int hits = 0;
2637	stack<BspRayTraversalData> tQueue;
2638
2639	float mint = 0.0f, maxt = 1.0f;
2640
2641	Intersectable::NewMail();
2642	ViewCell::NewMail();
2643
2644	Vector3 entp = origin;
2645	Vector3 extp = termination;
2646
2647	BspNode *node = mRoot;
2648	BspNode *farChild = NULL;
2649
2650	float t;
2651	while (1)
2652	{
2653	if (!node->IsLeaf())
2654	{
2655	BspInterior in = dynamic_cast<BspInterior >(node);
2656
2657	Plane3 splitPlane = in->GetPlane();
2658
2659	const int entSide = splitPlane.Side(entp);
2660	const int extSide = splitPlane.Side(extp);
2661
2662	if (entSide < 0)
2663	{
2664	node = in->GetBack();
2665	// plane does not split ray => no far child
2666	if (extSide <= 0)
2667	continue;
2668
2669	farChild = in->GetFront(); // plane splits ray
2670	}
2671	else if (entSide > 0)
2672	{
2673	node = in->GetFront();
2674
2675	if (extSide >= 0) // plane does not split ray => no far child
2676	continue;
2677
2678	farChild = in->GetBack(); // plane splits ray
2679	}
2680	else // ray end point on plane
2681	{ // NOTE: what to do if ray is coincident with plane?
2682	if (extSide < 0)
2683	node = in->GetBack();
2684	else
2685	node = in->GetFront();
2686
2687	continue; // no far child
2688	}
2689
2690	// push data for far child
2691	tQueue.push(BspRayTraversalData(farChild, extp));
2692
2693	// find intersection of ray segment with plane
2694	extp = splitPlane.FindIntersection(origin, extp, &t);
2695	}
2696	else
2697	{
2698	// reached leaf => intersection with view cell
2699	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2700
2701	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
2702	if (!viewCell->Mailed())
2703	{
2704	viewcells.push_back(viewCell);
2705	viewCell->Mail();
2706	++ hits;
2707	}
2708
2709	//-- fetch the next far child from the stack
2710	if (tQueue.empty())
2711	break;
2712
2713	entp = extp;
2714
2715	BspRayTraversalData &s = tQueue.top();
2716
2717	node = s.mNode;
2718	extp = s.mExitPoint;
2719
2720	tQueue.pop();
2721	}
2722	}
2723
2724	return hits;
2725	}
2726
2727
2728
2729
2730	int VspBspTree::TreeDistance(BspNode n1, BspNode n2) const
2731	{
2732	std::deque<BspNode *> path1;
2733	BspNode *p1 = n1;
2734
2735	// create path from node 1 to root
2736	while (p1)
2737	{
2738	if (p1 == n2) // second node on path
2739	return (int)path1.size();
2740
2741	path1.push_front(p1);
2742	p1 = p1->GetParent();
2743	}
2744
2745	int depth = n2->GetDepth();
2746	int d = depth;
2747
2748	BspNode *p2 = n2;
2749
2750	// compare with same depth
2751	while (1)
2752	{
2753	if ((d < (int)path1.size()) && (p2 == path1[d]))
2754	return (depth - d) + ((int)path1.size() - 1 - d);
2755
2756	-- d;
2757	p2 = p2->GetParent();
2758	}
2759
2760	return 0; // never come here
2761	}
2762
2763
2764	BspNode VspBspTree::CollapseTree(BspNode node, int &collapsed)
2765	{
2766	// TODO
2767	#if VC_HISTORY
2768	if (node->IsLeaf())
2769	return node;
2770
2771	BspInterior interior = dynamic_cast<BspInterior >(node);
2772
2773	BspNode *front = CollapseTree(interior->GetFront(), collapsed);
2774	BspNode *back = CollapseTree(interior->GetBack(), collapsed);
2775
2776	if (front->IsLeaf() && back->IsLeaf())
2777	{
2778	BspLeaf frontLeaf = dynamic_cast<BspLeaf >(front);
2779	BspLeaf backLeaf = dynamic_cast<BspLeaf >(back);
2780
2781	//-- collapse tree
2782	if (frontLeaf->GetViewCell() == backLeaf->GetViewCell())
2783	{
2784	BspViewCell *vc = frontLeaf->GetViewCell();
2785
2786	BspLeaf *leaf = new BspLeaf(interior->GetParent(), vc);
2787	leaf->SetTreeValid(frontLeaf->TreeValid());
2788
2789	// replace a link from node's parent
2790	if (leaf->GetParent())
2791	leaf->GetParent()->ReplaceChildLink(node, leaf);
2792	else
2793	mRoot = leaf;
2794
2795	++ collapsed;
2796	delete interior;
2797
2798	return leaf;
2799	}
2800	}
2801	#endif
2802	return node;
2803	}
2804
2805
2806	int VspBspTree::CollapseTree()
2807	{
2808	int collapsed = 0;
2809	//TODO
2810	#if VC_HISTORY
2811	(void)CollapseTree(mRoot, collapsed);
2812
2813	// revalidate leaves
2814	RepairViewCellsLeafLists();
2815	#endif
2816	return collapsed;
2817	}
2818
2819
2820	void VspBspTree::RepairViewCellsLeafLists()
2821	{
2822	// TODO
2823	#if VC_HISTORY
2824	// list not valid anymore => clear
2825	stack<BspNode *> nodeStack;
2826	nodeStack.push(mRoot);
2827
2828	ViewCell::NewMail();
2829
2830	while (!nodeStack.empty())
2831	{
2832	BspNode *node = nodeStack.top();
2833	nodeStack.pop();
2834
2835	if (node->IsLeaf())
2836	{
2837	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2838
2839	BspViewCell *viewCell = leaf->GetViewCell();
2840
2841	if (!viewCell->Mailed())
2842	{
2843	viewCell->mLeaves.clear();
2844	viewCell->Mail();
2845	}
2846
2847	viewCell->mLeaves.push_back(leaf);
2848
2849	}
2850	else
2851	{
2852	BspInterior interior = dynamic_cast<BspInterior >(node);
2853
2854	nodeStack.push(interior->GetFront());
2855	nodeStack.push(interior->GetBack());
2856	}
2857	}
2858	// TODO
2859	#endif
2860	}
2861
2862
2863	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
2864
2865
2866	int VspBspTree::CastBeam(Beam &beam)
2867	{
2868	stack<bspNodePair> nodeStack;
2869	BspNodeGeometry *rgeom = new BspNodeGeometry();
2870	ConstructGeometry(mRoot, *rgeom);
2871
2872	nodeStack.push(bspNodePair(mRoot, rgeom));
2873
2874	ViewCell::NewMail();
2875
2876	while (!nodeStack.empty())
2877	{
2878	BspNode *node = nodeStack.top().first;
2879	BspNodeGeometry *geom = nodeStack.top().second;
2880	nodeStack.pop();
2881
2882	AxisAlignedBox3 box;
2883	box.Initialize();
2884	geom->IncludeInBox(box);
2885
2886	const int side = beam.ComputeIntersection(box);
2887
2888	switch (side)
2889	{
2890	case -1:
2891	CollectViewCells(node, true, beam.mViewCells, true);
2892	break;
2893	case 0:
2894
2895	if (node->IsLeaf())
2896	{
2897	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
2898
2899	if (!leaf->GetViewCell()->Mailed() && leaf->TreeValid())
2900	{
2901	leaf->GetViewCell()->Mail();
2902	beam.mViewCells.push_back(leaf->GetViewCell());
2903	}
2904	}
2905	else
2906	{
2907	BspInterior interior = dynamic_cast<BspInterior >(node);
2908
2909	BspNode *first = interior->GetFront();
2910	BspNode *second = interior->GetBack();
2911
2912	BspNodeGeometry *firstGeom = new BspNodeGeometry();
2913	BspNodeGeometry *secondGeom = new BspNodeGeometry();
2914
2915	geom->SplitGeometry(*firstGeom,
2916	*secondGeom,
2917	interior->GetPlane(),
2918	mBox,
2919	mEpsilon);
2920
2921	// decide on the order of the nodes
2922	if (DotProd(beam.mPlanes[0].mNormal,
2923	interior->GetPlane().mNormal) > 0)
2924	{
2925	swap(first, second);
2926	swap(firstGeom, secondGeom);
2927	}
2928
2929	nodeStack.push(bspNodePair(first, firstGeom));
2930	nodeStack.push(bspNodePair(second, secondGeom));
2931	}
2932
2933	break;
2934	default:
2935	// default: cull
2936	break;
2937	}
2938
2939	DEL_PTR(geom);
2940
2941	}
2942
2943	return (int)beam.mViewCells.size();
2944	}
2945
2946
2947	void VspBspTree::SetViewCellsManager(ViewCellsManager *vcm)
2948	{
2949	mViewCellsManager = vcm;
2950	}
2951
2952
2953	int VspBspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
2954	vector<MergeCandidate> &candidates)
2955	{
2956	BspLeaf::NewMail();
2957
2958	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
2959
2960	int numCandidates = 0;
2961
2962	// find merge candidates and push them into queue
2963	for (it = leaves.begin(); it != it_end; ++ it)
2964	{
2965	BspLeaf leaf = it;
2966
2967	// the same leaves must not be part of two merge candidates
2968	leaf->Mail();
2969
2970	vector<BspLeaf *> neighbors;
2971	if (0)
2972	FindNeighbors(leaf, neighbors, true);
2973	else
2974	FindApproximateNeighbors(leaf, neighbors, true);
2975	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
2976
2977	// TODO: test if at least one ray goes from one leaf to the other
2978	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
2979	{
2980	if ((*nit)->GetViewCell() != leaf->GetViewCell())
2981	{
2982	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
2983	candidates.push_back(mc);
2984
2985	++ numCandidates;
2986	if ((numCandidates % 1000) == 0)
2987	{
2988	cout << "collected " << numCandidates << " merge candidates" << endl;
2989	}
2990	}
2991	}
2992	}
2993
2994	Debug << "merge queue: " << (int)candidates.size() << endl;
2995	Debug << "leaves in queue: " << numCandidates << endl;
2996
2997
2998	return (int)leaves.size();
2999	}
3000
3001
3002	int VspBspTree::CollectMergeCandidates(const VssRayContainer &rays,
3003	vector<MergeCandidate> &candidates)
3004	{
3005	ViewCell::NewMail();
3006	long startTime = GetTime();
3007
3008	map<BspLeaf , vector<BspLeaf> > neighborMap;
3009	ViewCellContainer::const_iterator iit;
3010
3011	int numLeaves = 0;
3012
3013	BspLeaf::NewMail();
3014
3015	for (int i = 0; i < (int)rays.size(); ++ i)
3016	{
3017	VssRay *ray = rays[i];
3018
3019	// traverse leaves stored in the rays and compare and
3020	// merge consecutive leaves (i.e., the neighbors in the tree)
3021	if (ray->mViewCells.size() < 2)
3022	continue;
3023	//TODO viewcellhierarchy
3024	iit = ray->mViewCells.begin();
3025	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
3026	BspLeaf *leaf = bspVc->mLeaf;
3027
3028	// traverse intersections
3029	// consecutive leaves are neighbors => add them to queue
3030	for (; iit != ray->mViewCells.end(); ++ iit)
3031	{
3032	// next pair
3033	BspLeaf *prevLeaf = leaf;
3034	bspVc = dynamic_cast<BspViewCell >(iit);
3035	leaf = bspVc->mLeaf;
3036
3037	// view space not valid or same view cell
3038	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
3039	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
3040	continue;
3041
3042	vector<BspLeaf *> &neighbors = neighborMap[leaf];
3043
3044	bool found = false;
3045
3046	// both leaves inserted in queue already =>
3047	// look if double pair already exists
3048	if (leaf->Mailed() && prevLeaf->Mailed())
3049	{
3050	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
3051
3052	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
3053	if (*it == prevLeaf)
3054	found = true; // already in queue
3055	}
3056
3057	if (!found)
3058	{
3059	// this pair is not in map yet
3060	// => insert into the neighbor map and the queue
3061	neighbors.push_back(prevLeaf);
3062	neighborMap[prevLeaf].push_back(leaf);
3063
3064	leaf->Mail();
3065	prevLeaf->Mail();
3066
3067	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
3068
3069	candidates.push_back(mc);
3070
3071	if (((int)candidates.size() % 1000) == 0)
3072	{
3073	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
3074	}
3075	}
3076	}
3077	}
3078
3079	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
3080	Debug << "merge queue: " << (int)candidates.size() << endl;
3081	Debug << "leaves in queue: " << numLeaves << endl;
3082
3083
3084	//-- collect the leaves which haven't been found by ray casting
3085	if (0)
3086	{
3087	cout << "finding additional merge candidates using geometry" << endl;
3088	vector<BspLeaf *> leaves;
3089	CollectLeaves(leaves, true);
3090	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
3091	CollectMergeCandidates(leaves, candidates);
3092	}
3093
3094	return numLeaves;
3095	}
3096
3097
3098
3099
3100	ViewCell *VspBspTree::GetViewCell(const Vector3 &point)
3101	{
3102	if (mRoot == NULL)
3103	return NULL;
3104
3105	stack<BspNode *> nodeStack;
3106	nodeStack.push(mRoot);
3107
3108	ViewCell *viewcell = NULL;
3109
3110	while (!nodeStack.empty()) {
3111	BspNode *node = nodeStack.top();
3112	nodeStack.pop();
3113
3114	if (node->IsLeaf()) {
3115	viewcell = dynamic_cast<BspLeaf *>(node)->GetViewCell();
3116	break;
3117	} else {
3118
3119	BspInterior interior = dynamic_cast<BspInterior >(node);
3120
3121	// random decision
3122	if (interior->GetPlane().Side(point) < 0)
3123	nodeStack.push(interior->GetBack());
3124	else
3125	nodeStack.push(interior->GetFront());
3126	}
3127	}
3128
3129	return viewcell;
3130	}
3131
3132
3133	bool VspBspTree::ViewPointValid(const Vector3 &viewPoint) const
3134	{
3135	BspNode *node = mRoot;
3136
3137	while (1)
3138	{
3139	// early exit
3140	if (node->TreeValid())
3141	return true;
3142
3143	if (node->IsLeaf())
3144	return false;
3145
3146	BspInterior in = dynamic_cast<BspInterior >(node);
3147
3148	if (in->GetPlane().Side(viewPoint) <= 0)
3149	{
3150	node = in->GetBack();
3151	}
3152	else
3153	{
3154	node = in->GetFront();
3155	}
3156	}
3157
3158	// should never come here
3159	return false;
3160	}
3161
3162
3163	void VspBspTree::PropagateUpValidity(BspNode *node)
3164	{
3165	const bool isValid = node->TreeValid();
3166
3167	// propagative up invalid flag until only invalid nodes exist over this node
3168	if (!isValid)
3169	{
3170	while (!node->IsRoot() && node->GetParent()->TreeValid())
3171	{
3172	node = node->GetParent();
3173	node->SetTreeValid(false);
3174	}
3175	}
3176	else
3177	{
3178	// propagative up valid flag until one of the subtrees is invalid
3179	while (!node->IsRoot() && !node->TreeValid())
3180	{
3181	node = node->GetParent();
3182	BspInterior interior = dynamic_cast<BspInterior >(node);
3183
3184	// the parent is valid iff both leaves are valid
3185	node->SetTreeValid(interior->GetBack()->TreeValid() &&
3186	interior->GetFront()->TreeValid());
3187	}
3188	}
3189	}
3190
3191
3192	bool VspBspTree::Export(ofstream &stream)
3193	{
3194	ExportNode(mRoot, stream);
3195
3196	return true;
3197	}
3198
3199
3200	void VspBspTree::ExportNode(BspNode *node, ofstream &stream)
3201	{
3202	if (node->IsLeaf())
3203	{
3204	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
3205	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
3206
3207	int id = -1;
3208	if (viewCell != mOutOfBoundsCell)
3209	id = viewCell->GetId();
3210
3211	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
3212	}
3213	else
3214	{
3215	BspInterior interior = dynamic_cast<BspInterior >(node);
3216
3217	Plane3 plane = interior->GetPlane();
3218	stream << "<Interior plane=\"" << plane.mNormal.x << " "
3219	<< plane.mNormal.y << " " << plane.mNormal.z << " "
3220	<< plane.mD << "\">" << endl;
3221
3222	ExportNode(interior->GetBack(), stream);
3223	ExportNode(interior->GetFront(), stream);
3224
3225	stream << "</Interior>" << endl;
3226	}
3227	}

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