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source: GTP/trunk/Lib/Vis/Preprocessing/src/ViewCellBsp.cpp @ 1291

Revision 1291, 81.1 KB checked in by mattausch, 18 years ago (diff)

Rev	Line
[463]	1	#include "Plane3.h"
	2	#include "ViewCellBsp.h"
	3	#include "Mesh.h"
	4	#include "common.h"
	5	#include "ViewCell.h"
	6	#include "Environment.h"
	7	#include "Polygon3.h"
	8	#include "Ray.h"
	9	#include "AxisAlignedBox3.h"
[503]	10	#include "Triangle3.h"
[544]	11	#include "Tetrahedron3.h"
[587]	12	#include "ViewCellsManager.h"
[463]	13	#include "Exporter.h"
	14	#include "Plane3.h"
[587]	15	#include <stack>
[463]	16
[863]	17	namespace GtpVisibilityPreprocessor {
[590]	18
	19
[463]	20	//-- static members
	21
	22	int BspNode::sMailId = 1;
	23
	24	/** Evaluates split plane classification with respect to the plane's
	25	contribution for a minimum number splits in the tree.
	26	*/
	27	const float BspTree::sLeastPolySplitsTable[] = {0, 0, 1, 0};
	28	/** Evaluates split plane classification with respect to the plane's
	29	contribution for a balanced tree.
	30	*/
	31	const float BspTree::sBalancedPolysTable[] = {1, -1, 0, 0};
	32
	33	/** Evaluates split plane classification with respect to the plane's
	34	contribution for a minimum number of ray splits.
	35	*/
	36	const float BspTree::sLeastRaySplitsTable[] = {0, 0, 1, 1, 0};
	37	/** Evaluates split plane classification with respect to the plane's
	38	contribution for balanced rays.
	39	*/
	40	const float BspTree::sBalancedRaysTable[] = {1, -1, 0, 0, 0};
	41
	42	int BspTree::sFrontId = 0;
	43	int BspTree::sBackId = 0;
	44	int BspTree::sFrontAndBackId = 0;
	45
[489]	46
[719]	47	/******************************************************************/
	48	/* class BspNode implementation */
	49	/******************************************************************/
[463]	50
[489]	51
[463]	52	BspNode::BspNode():
[610]	53	mParent(NULL), mTreeValid(true), mTimeStamp(0)
[463]	54	{}
	55
[650]	56
[463]	57	BspNode::BspNode(BspInterior *parent):
[489]	58	mParent(parent), mTreeValid(true)
[463]	59	{}
	60
	61
[482]	62	bool BspNode::IsSibling(BspNode *n) const
	63	{
	64	return ((this != n) && mParent &&
	65	(mParent->GetFront() == n) \|\| (mParent->GetBack() == n));
	66	}
	67
[487]	68
[482]	69	int BspNode::GetDepth() const
	70	{
	71	int depth = 0;
	72	BspNode *p = mParent;
	73
	74	while (p)
	75	{
	76	p = p->mParent;
	77	++ depth;
	78	}
	79
	80	return depth;
	81	}
	82
[487]	83
	84	bool BspNode::TreeValid() const
	85	{
	86	return mTreeValid;
	87	}
	88
	89
	90	void BspNode::SetTreeValid(const bool v)
	91	{
	92	mTreeValid = v;
	93	}
	94
	95
[463]	96	/****************************************************************/
	97	/* class BspInterior implementation */
	98	/****************************************************************/
	99
	100
	101	BspInterior::BspInterior(const Plane3 &plane):
	102	mPlane(plane), mFront(NULL), mBack(NULL)
	103	{}
	104
	105	BspInterior::~BspInterior()
	106	{
	107	DEL_PTR(mFront);
	108	DEL_PTR(mBack);
	109	}
	110
	111
	112	void BspInterior::SetupChildLinks(BspNode b, BspNode f)
	113	{
	114	mBack = b;
	115	mFront = f;
	116	}
	117
[710]	118
[463]	119	/****************************************************************/
	120	/* class BspLeaf implementation */
	121	/****************************************************************/
	122
	123
[485]	124	BspLeaf::BspLeaf(): mViewCell(NULL), mPvs(NULL)
[463]	125	{
	126	}
	127
	128
[485]	129	BspLeaf::~BspLeaf()
	130	{
	131	DEL_PTR(mPvs);
	132	}
	133
	134
[882]	135	BspLeaf::BspLeaf(ViewCellLeaf *viewCell):
[463]	136	mViewCell(viewCell)
	137	{
	138	}
	139
	140
	141	BspLeaf::BspLeaf(BspInterior *parent):
[485]	142	BspNode(parent), mViewCell(NULL), mPvs(NULL)
[463]	143	{}
	144
	145
	146
[882]	147	BspLeaf::BspLeaf(BspInterior parent, ViewCellLeaf viewCell):
[485]	148	BspNode(parent), mViewCell(viewCell), mPvs(NULL)
[463]	149	{
	150	}
	151
	152
[580]	153	/*********************************************************************/
	154	/* class BspTree implementation */
	155	/*********************************************************************/
[573]	156
[463]	157	BspTree::BspTree():
	158	mRoot(NULL),
[587]	159	mUseAreaForPvs(false),
[610]	160	mGenerateViewCells(true),
[650]	161	mTimeStamp(1)
[463]	162	{
	163	Randomize(); // initialise random generator for heuristics
	164
[590]	165	mOutOfBoundsCell = GetOrCreateOutOfBoundsCell();
[463]	166
	167	//-- termination criteria for autopartition
[1004]	168	Environment::GetSingleton()->GetIntValue("BspTree.Termination.maxDepth", mTermMaxDepth);
	169	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minPvs", mTermMinPvs);
	170	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minPolygons", mTermMinPolys);
	171	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minRays", mTermMinRays);
	172	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.minProbability", mTermMinProbability);
	173	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.maxRayContribution", mTermMaxRayContribution);
	174	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
[463]	175
	176	//-- factors for bsp tree split plane heuristics
[1004]	177	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.verticalSplits", mVerticalSplitsFactor);
	178	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.largestPolyArea", mLargestPolyAreaFactor);
	179	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.blockedRays", mBlockedRaysFactor);
	180	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.leastRaySplits", mLeastRaySplitsFactor);
	181	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedRays", mBalancedRaysFactor);
	182	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.pvs", mPvsFactor);
	183	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.leastSplits" , mLeastSplitsFactor);
	184	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedPolys", mBalancedPolysFactor);
	185	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedViewCells", mBalancedViewCellsFactor);
	186	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.ct_div_ci", mCtDivCi);
[463]	187
	188	//-- termination criteria for axis aligned split
[1004]	189	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.AxisAligned.ct_div_ci", mAxisAlignedCtDivCi);
	190	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.maxCostRatio", mMaxCostRatio);
	191	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minPolys",
[463]	192	mTermMinPolysForAxisAligned);
[1004]	193	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minRays",
[463]	194	mTermMinRaysForAxisAligned);
[1004]	195	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minObjects",
[463]	196	mTermMinObjectsForAxisAligned);
	197	//-- partition criteria
[1004]	198	Environment::GetSingleton()->GetIntValue("BspTree.maxPolyCandidates", mMaxPolyCandidates);
	199	Environment::GetSingleton()->GetIntValue("BspTree.maxRayCandidates", mMaxRayCandidates);
	200	Environment::GetSingleton()->GetIntValue("BspTree.splitPlaneStrategy", mSplitPlaneStrategy);
	201	Environment::GetSingleton()->GetFloatValue("BspTree.AxisAligned.splitBorder", mSplitBorder);
	202	Environment::GetSingleton()->GetIntValue("BspTree.maxTests", mMaxTests);
	203	Environment::GetSingleton()->GetIntValue("BspTree.Termination.maxViewCells", mMaxViewCells);
[463]	204
[1004]	205	Environment::GetSingleton()->GetFloatValue("BspTree.Construction.epsilon", mEpsilon);
[611]	206
[660]	207	char subdivisionStatsLog[100];
[1004]	208	Environment::GetSingleton()->GetStringValue("BspTree.subdivisionStats", subdivisionStatsLog);
[660]	209	mSubdivisionStats.open(subdivisionStatsLog);
[611]	210
[463]	211	Debug << "BSP max depth: " << mTermMaxDepth << endl;
	212	Debug << "BSP min PVS: " << mTermMinPvs << endl;
[587]	213	Debug << "BSP min probability: " << mTermMinProbability << endl;
[463]	214	Debug << "BSP max polys: " << mTermMinPolys << endl;
	215	Debug << "BSP max rays: " << mTermMinRays << endl;
	216	Debug << "BSP max polygon candidates: " << mMaxPolyCandidates << endl;
	217	Debug << "BSP max plane candidates: " << mMaxRayCandidates << endl;
	218
	219	Debug << "Split plane strategy: ";
	220	if (mSplitPlaneStrategy & RANDOM_POLYGON)
	221	Debug << "random polygon ";
	222	if (mSplitPlaneStrategy & AXIS_ALIGNED)
	223	Debug << "axis aligned ";
	224	if (mSplitPlaneStrategy & LEAST_SPLITS)
	225	Debug << "least splits ";
	226	if (mSplitPlaneStrategy & BALANCED_POLYS)
	227	Debug << "balanced polygons ";
	228	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	229	Debug << "balanced view cells ";
	230	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	231	Debug << "largest polygon area ";
	232	if (mSplitPlaneStrategy & VERTICAL_AXIS)
	233	Debug << "vertical axis ";
	234	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	235	Debug << "blocked rays ";
	236	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	237	Debug << "least ray splits ";
	238	if (mSplitPlaneStrategy & BALANCED_RAYS)
	239	Debug << "balanced rays ";
	240	if (mSplitPlaneStrategy & PVS)
	241	Debug << "pvs";
	242
	243	Debug << endl;
	244	}
	245
	246
	247	const BspTreeStatistics &BspTree::GetStatistics() const
	248	{
	249	return mStat;
	250	}
	251
	252
	253	int BspTree::SplitPolygons(const Plane3 &plane,
	254	PolygonContainer &polys,
	255	PolygonContainer &frontPolys,
	256	PolygonContainer &backPolys,
	257	PolygonContainer &coincident) const
	258	{
	259	int splits = 0;
	260
	261	#ifdef _Debug
	262	Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl;
	263	#endif
[648]	264
[574]	265	PolygonContainer::const_iterator it, it_end = polys.end();
	266
	267	for (it = polys.begin(); it != polys.end(); ++ it)
[463]	268	{
[574]	269	Polygon3 poly = it;
	270
[491]	271	//-- classify polygon
[463]	272	const int cf = poly->ClassifyPlane(plane, mEpsilon);
	273
	274	switch (cf)
	275	{
	276	case Polygon3::COINCIDENT:
	277	coincident.push_back(poly);
	278	break;
	279	case Polygon3::FRONT_SIDE:
	280	frontPolys.push_back(poly);
	281	break;
	282	case Polygon3::BACK_SIDE:
	283	backPolys.push_back(poly);
	284	break;
	285	case Polygon3::SPLIT:
	286	{
	287	Polygon3 *front_piece = new Polygon3(poly->mParent);
	288	Polygon3 *back_piece = new Polygon3(poly->mParent);
	289
	290	//-- split polygon into front and back part
	291	poly->Split(plane,
	292	*front_piece,
	293	*back_piece,
	294	mEpsilon);
	295
	296	++ splits; // increase number of splits
	297
	298	//-- inherit rays from parent polygon for blocked ray criterium
	299	poly->InheritRays(front_piece, back_piece);
	300
	301	// check if polygons still valid
	302	if (front_piece->Valid(mEpsilon))
	303	frontPolys.push_back(front_piece);
	304	else
	305	DEL_PTR(front_piece);
	306
	307	if (back_piece->Valid(mEpsilon))
	308	backPolys.push_back(back_piece);
	309	else
	310	DEL_PTR(back_piece);
	311
	312	#ifdef _DEBUG
	313	Debug << "split " << poly << endl << front_piece << endl << *back_piece << endl;
	314	#endif
	315	DEL_PTR(poly);
	316	}
	317	break;
	318	default:
	319	Debug << "SHOULD NEVER COME HERE\n";
	320	break;
	321	}
	322	}
	323
	324	return splits;
	325	}
	326
	327
	328	void BspTreeStatistics::Print(ostream &app) const
	329	{
	330	app << "===== BspTree statistics ===============\n";
	331
	332	app << setprecision(4);
	333
	334	app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
	335
	336	app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
	337
	338	app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
	339
	340	app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
	341
[491]	342	app << "#N_POLYSPLITS ( Number of polygon splits )\n" << polySplits << "\n";
[463]	343
[491]	344	app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits[0] + splits[1] + splits[2] << endl;
	345
[667]	346	app << "#N_SPLITS ( Number of splits in axes x y z)\n";
[491]	347
	348	for (int i = 0; i < 3; ++ i)
	349	app << splits[i] << " ";
	350	app << endl;
	351
[463]	352	app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
	353	<< maxDepthNodes * 100 / (double)Leaves() << endl;
	354
	355	app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n"
	356	<< minPvsNodes * 100 / (double)Leaves() << endl;
	357
	358	app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n"
[473]	359	<< minRaysNodes * 100 / (double)Leaves() << endl;
[463]	360
[473]	361	app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
	362	<< maxCostNodes * 100 / (double)Leaves() << endl;
	363
[600]	364	app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
[547]	365	<< minProbabilityNodes * 100 / (double)Leaves() << endl;
[463]	366
	367	app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"
	368	<< maxRayContribNodes * 100 / (double)Leaves() << endl;
	369
	370	app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
	371
	372	app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
	373
	374	app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
	375
[490]	376	app << "#N_INPUTPOLYGONS (number of input polygons )\n" << polys << endl;
[463]	377
[490]	378	app << "#N_INVALIDLEAVES (number of invalid leaves )\n" << invalidLeaves << endl;
	379
[503]	380	app << "#N_RAYS (number of rays / leaf)\n" << AvgRays() << endl;
[463]	381	//app << "#N_PVS: " << pvs << endl;
	382
	383	app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" <<
[491]	384	(polys + polySplits) / (double)polys << endl;
[463]	385
	386	app << "===== END OF BspTree statistics ==========\n";
	387	}
	388
	389
	390	BspTree::~BspTree()
	391	{
	392	DEL_PTR(mRoot);
[485]	393
[590]	394	// TODO must be deleted if used!!
	395	//if (mGenerateViewCells) DEL_PTR(mOutOfBoundsCell);
[463]	396	}
	397
[590]	398	BspViewCell *BspTree::GetOutOfBoundsCell()
[463]	399	{
[590]	400	return mOutOfBoundsCell;
[463]	401	}
	402
[590]	403
	404	BspNode *BspTree::GetRoot() const
	405	{
	406	return mRoot;
	407	}
	408
[711]	409
[590]	410	BspViewCell *BspTree::GetOrCreateOutOfBoundsCell()
	411	{
	412	if (!mOutOfBoundsCell)
	413	{
	414	mOutOfBoundsCell = new BspViewCell();
	415	mOutOfBoundsCell->SetId(-1);
	416	mOutOfBoundsCell->SetValid(false);
	417	}
	418
	419	return mOutOfBoundsCell;
	420	}
	421
	422
[882]	423	void BspTree::InsertViewCell(ViewCellLeaf *viewCell)
[463]	424	{
	425	PolygonContainer *polys = new PolygonContainer();
	426
	427	// don't generate new view cell, insert this one
	428	mGenerateViewCells = false;
	429	// extract polygons that guide the split process
	430	mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell);
	431	mBox.Include(viewCell->GetBox()); // add to BSP aabb
	432
	433	InsertPolygons(polys);
	434	}
	435
[590]	436
[463]	437	void BspTree::InsertPolygons(PolygonContainer *polys)
	438	{
[472]	439	BspTraversalStack tStack;
[463]	440
	441	// traverse existing tree or create new tree
	442	if (!mRoot)
	443	mRoot = new BspLeaf();
	444
[473]	445	tStack.push(BspTraversalData(mRoot,
	446	polys,
	447	0,
[590]	448	mOutOfBoundsCell,
[473]	449	new BoundedRayContainer(),
	450	0,
[587]	451	mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
[473]	452	new BspNodeGeometry()));
[463]	453
	454	while (!tStack.empty())
	455	{
	456	// filter polygons donw the tree
	457	BspTraversalData tData = tStack.top();
	458	tStack.pop();
	459
	460	if (!tData.mNode->IsLeaf())
	461	{
	462	BspInterior interior = dynamic_cast<BspInterior >(tData.mNode);
	463
	464	//-- filter view cell polygons down the tree until a leaf is reached
	465	if (!tData.mPolygons->empty())
	466	{
	467	PolygonContainer *frontPolys = new PolygonContainer();
	468	PolygonContainer *backPolys = new PolygonContainer();
	469	PolygonContainer coincident;
	470
	471	int splits = 0;
	472
	473	// split viewcell polygons with respect to split plane
	474	splits += SplitPolygons(interior->GetPlane(),
	475	*tData.mPolygons,
	476	*frontPolys,
	477	*backPolys,
	478	coincident);
	479
	480	// extract view cells associated with the split polygons
[882]	481	ViewCellLeaf *frontViewCell = GetOrCreateOutOfBoundsCell();
	482	ViewCellLeaf *backViewCell = GetOrCreateOutOfBoundsCell();
[463]	483
	484	BspTraversalData frontData(interior->GetFront(),
	485	frontPolys,
	486	tData.mDepth + 1,
[590]	487	mOutOfBoundsCell,
[463]	488	tData.mRays,
	489	tData.mPvs,
[587]	490	mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
[463]	491	new BspNodeGeometry());
	492
	493	BspTraversalData backData(interior->GetBack(),
	494	backPolys,
	495	tData.mDepth + 1,
[590]	496	mOutOfBoundsCell,
[463]	497	tData.mRays,
	498	tData.mPvs,
[587]	499	mUseAreaForPvs ? mBox.SurfaceArea() : mBox.GetVolume(),
[463]	500	new BspNodeGeometry());
	501
	502	if (!mGenerateViewCells)
	503	{
	504	ExtractViewCells(frontData,
	505	backData,
	506	coincident,
	507	interior->mPlane);
	508	}
	509
	510	// don't need coincident polygons anymore
	511	CLEAR_CONTAINER(coincident);
	512
[491]	513	mStat.polySplits += splits;
[463]	514
	515	// push the children on the stack
	516	tStack.push(frontData);
	517	tStack.push(backData);
	518	}
	519
	520	// cleanup
	521	DEL_PTR(tData.mPolygons);
	522	DEL_PTR(tData.mRays);
	523	}
	524	else
	525	{
	526	// reached leaf => subdivide current viewcell
	527	BspNode *subRoot = Subdivide(tStack, tData);
	528	}
	529	}
	530	}
	531
[710]	532
[463]	533	int BspTree::AddMeshToPolygons(Mesh *mesh,
	534	PolygonContainer &polys,
	535	MeshInstance *parent)
	536	{
[710]	537	FaceContainer::const_iterator fi, fi_end = mesh->mFaces.end();
[463]	538
	539	// copy the face data to polygons
[710]	540	for (fi = mesh->mFaces.begin(); fi != fi_end; ++ fi)
[463]	541	{
	542	Polygon3 poly = new Polygon3((fi), mesh);
	543
	544	if (poly->Valid(mEpsilon))
	545	{
	546	poly->mParent = parent; // set parent intersectable
	547	polys.push_back(poly);
	548	}
	549	else
	550	DEL_PTR(poly);
	551	}
	552	return (int)mesh->mFaces.size();
	553	}
	554
[587]	555
[463]	556	int BspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
	557	PolygonContainer &polys,
	558	int maxObjects)
	559	{
	560	int limit = (maxObjects > 0) ?
	561	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
	562
	563	int polysSize = 0;
	564
	565	for (int i = 0; i < limit; ++ i)
	566	{
	567	if (viewCells[i]->GetMesh()) // copy the mesh data to polygons
	568	{
	569	mBox.Include(viewCells[i]->GetBox()); // add to BSP tree aabb
	570	polysSize += AddMeshToPolygons(viewCells[i]->GetMesh(), polys, viewCells[i]);
	571	}
	572	}
	573
	574	return polysSize;
	575	}
	576
[587]	577
	578	int BspTree::AddToPolygonSoup(const ObjectContainer &objects,
	579	PolygonContainer &polys,
	580	int maxObjects,
	581	bool addToBbox)
[463]	582	{
[587]	583	int limit = (maxObjects > 0) ?
	584	Min((int)objects.size(), maxObjects) : (int)objects.size();
[463]	585
	586	for (int i = 0; i < limit; ++i)
	587	{
[1001]	588	Intersectable *object = objects[i];
	589
[463]	590	Mesh *mesh = NULL;
	591
	592	switch (object->Type()) // extract the meshes
	593	{
	594	case Intersectable::MESH_INSTANCE:
	595	mesh = dynamic_cast<MeshInstance *>(object)->GetMesh();
	596	break;
	597	case Intersectable::VIEW_CELL:
	598	mesh = dynamic_cast<ViewCell *>(object)->GetMesh();
	599	break;
[1001]	600	case Intersectable::TRANSFORMED_MESH_INSTANCE:
	601	{
[1002]	602	TransformedMeshInstance mi = dynamic_cast<TransformedMeshInstance >(object);
[1001]	603
[1002]	604	if (!mi->GetMesh())
[1001]	605	break;
[1002]	606	mesh = new Mesh();
	607	mi->GetTransformedMesh(*mesh);
[1001]	608
	609	break;
	610	}
[463]	611	default:
	612	Debug << "intersectable type not supported" << endl;
	613	break;
	614	}
	615
	616	if (mesh) // copy the mesh data to polygons
	617	{
[587]	618	if (addToBbox)
	619	mBox.Include(object->GetBox()); // add to BSP tree aabb
[1001]	620
[590]	621	AddMeshToPolygons(mesh, polys, mOutOfBoundsCell);
[1001]	622
	623	// cleanup
	624	if (object->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
	625	DEL_PTR(mesh);
	626	}
[463]	627	}
	628
	629	return (int)polys.size();
	630	}
	631
[587]	632
[463]	633	void BspTree::Construct(const ViewCellContainer &viewCells)
	634	{
	635	mStat.nodes = 1;
	636	mBox.Initialize(); // initialise bsp tree bounding box
	637
	638	// copy view cell meshes into one big polygon soup
	639	PolygonContainer *polys = new PolygonContainer();
	640	mStat.polys = AddToPolygonSoup(viewCells, *polys);
	641
	642	// view cells are given
	643	mGenerateViewCells = false;
	644	// construct tree from the view cell polygons
	645	Construct(polys, new BoundedRayContainer());
	646	}
	647
	648
	649	void BspTree::Construct(const ObjectContainer &objects)
	650	{
	651	mStat.nodes = 1;
	652	mBox.Initialize(); // initialise bsp tree bounding box
	653
	654	PolygonContainer *polys = new PolygonContainer();
	655
	656	mGenerateViewCells = true;
	657	// copy mesh instance polygons into one big polygon soup
	658	mStat.polys = AddToPolygonSoup(objects, *polys);
	659
	660	// construct tree from polygon soup
	661	Construct(polys, new BoundedRayContainer());
	662	}
	663
[587]	664
[647]	665	void BspTree::PreprocessPolygons(PolygonContainer &polys)
	666	{
	667	// preprocess: throw out polygons coincident to the view space box (not needed)
	668	PolygonContainer boxPolys;
[648]	669	mBox.ExtractPolys(boxPolys);
[647]	670	vector<Plane3> boxPlanes;
	671
[648]	672	PolygonContainer::iterator pit, pit_end = boxPolys.end();
	673
	674	// extract planes of box
	675	// TODO: can be done more elegantly than first extracting polygons
	676	// and take their planes
	677	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
[647]	678	{
[648]	679	boxPlanes.push_back((*pit)->GetSupportingPlane());
	680	}
	681
	682	pit_end = polys.end();
	683
	684	for (pit = polys.begin(); pit != pit_end; ++ pit)
	685	{
	686	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
[647]	687
[648]	688	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
	689	{
	690	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
	691
	692	if (cf == Polygon3::COINCIDENT)
	693	{
	694	DEL_PTR(*pit);
	695	//Debug << "coincident!!" << endl;
	696	}
	697	}
[647]	698	}
[648]	699
	700	// remove deleted entries
	701	for (int i = 0; i < (int)polys.size(); ++ i)
	702	{
	703	while (!polys[i] && (i < (int)polys.size()))
	704	{
	705	swap(polys[i], polys.back());
	706	polys.pop_back();
	707	}
	708	}
[1002]	709
	710	CLEAR_CONTAINER(boxPolys);
[647]	711	}
	712
[648]	713
	714
[587]	715	void BspTree::Construct(const RayContainer &sampleRays,
	716	AxisAlignedBox3 *forcedBoundingBox)
[463]	717	{
	718	mStat.nodes = 1;
	719	mBox.Initialize(); // initialise BSP tree bounding box
	720
[587]	721	if (forcedBoundingBox)
	722	mBox = *forcedBoundingBox;
	723
[463]	724	PolygonContainer *polys = new PolygonContainer();
	725	BoundedRayContainer *rays = new BoundedRayContainer();
	726
	727	RayContainer::const_iterator rit, rit_end = sampleRays.end();
	728
	729	// generate view cells
	730	mGenerateViewCells = true;
	731
	732	long startTime = GetTime();
	733
	734	Debug << "** Extracting polygons from rays **\n";
	735
	736	std::map<Face , Polygon3 > facePolyMap;
	737
	738	//-- extract polygons intersected by the rays
	739	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	740	{
	741	Ray ray = rit;
	742
	743	// get ray-face intersection. Store polygon representing the rays together
	744	// with rays intersecting the face.
	745	if (!ray->intersections.empty())
	746	{
	747	MeshInstance obj = dynamic_cast<MeshInstance >(ray->intersections[0].mObject);
	748
[1002]	749	Mesh *mesh;
	750	if (obj->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
	751	{
	752	TransformedMeshInstance *tmobj =
	753	dynamic_cast<TransformedMeshInstance *>(obj);
	754
	755	mesh = new Mesh();
	756	tmobj->GetTransformedMesh(*mesh);
	757	}
	758	else // MeshInstance
	759	{
	760	mesh = obj->GetMesh();
	761	}
	762
	763	Face *face = mesh->mFaces[ray->intersections[0].mFace];
[463]	764	std::map<Face , Polygon3 >::iterator it = facePolyMap.find(face);
	765
	766	if (it != facePolyMap.end())
	767	{
	768	//store rays if needed for heuristics
	769	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	770	(*it).second->mPiercingRays.push_back(ray);
	771	}
	772	else
[1002]	773	{
	774	//store rays if needed for heuristics
	775	Polygon3 *poly = new Polygon3(face, mesh);
[463]	776	poly->mParent = obj;
	777	polys->push_back(poly);
	778
	779	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	780	poly->mPiercingRays.push_back(ray);
	781
	782	facePolyMap[face] = poly;
	783	}
[1002]	784
	785	// cleanup
	786	if (obj->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
	787	DEL_PTR(mesh);
[463]	788	}
	789	}
	790
	791	facePolyMap.clear();
	792
	793	// compute bounding box
[587]	794	if (!forcedBoundingBox)
[860]	795	mBox.Include(*polys);
[463]	796
	797	//-- store rays
	798	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	799	{
	800	Ray ray = rit;
	801	ray->SetId(-1); // reset id
	802
	803	float minT, maxT;
	804	if (mBox.GetRaySegment(*ray, minT, maxT))
	805	rays->push_back(new BoundedRay(ray, minT, maxT));
	806	}
	807
[648]	808	// throw out bad polygons
	809	PreprocessPolygons(*polys);
[647]	810
[463]	811	mStat.polys = (int)polys->size();
	812
	813	Debug << "** Finished polygon extraction **" << endl;
	814	Debug << (int)polys->size() << " polys extracted from " << (int)sampleRays.size() << " rays" << endl;
	815	Debug << "extraction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
	816
	817	Construct(polys, rays);
	818	}
	819
[587]	820
	821	void BspTree::Construct(const ObjectContainer &objects,
	822	const RayContainer &sampleRays,
	823	AxisAlignedBox3 *forcedBoundingBox)
[463]	824	{
	825	mStat.nodes = 1;
	826	mBox.Initialize(); // initialise BSP tree bounding box
	827
[587]	828	if (forcedBoundingBox)
	829	mBox = *forcedBoundingBox;
	830
[463]	831	BoundedRayContainer *rays = new BoundedRayContainer();
	832	PolygonContainer *polys = new PolygonContainer();
	833
	834	mGenerateViewCells = true;
	835
	836	// copy mesh instance polygons into one big polygon soup
[587]	837	mStat.polys = AddToPolygonSoup(objects, *polys, 0, !forcedBoundingBox);
[463]	838
[587]	839
[463]	840	RayContainer::const_iterator rit, rit_end = sampleRays.end();
	841
	842	//-- store rays
	843	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	844	{
	845	Ray ray = rit;
	846	ray->SetId(-1); // reset id
	847
	848	float minT, maxT;
	849	if (mBox.GetRaySegment(*ray, minT, maxT))
	850	rays->push_back(new BoundedRay(ray, minT, maxT));
	851	}
	852
[648]	853	PreprocessPolygons(*polys);
[463]	854	Debug << "tree has " << (int)polys->size() << " polys, " << (int)sampleRays.size() << " rays" << endl;
	855	Construct(polys, rays);
	856	}
	857
[587]	858
[463]	859	void BspTree::Construct(PolygonContainer polys, BoundedRayContainer rays)
	860	{
[472]	861	BspTraversalStack tStack;
[463]	862
	863	mRoot = new BspLeaf();
	864
	865	// constrruct root node geometry
[503]	866	BspNodeGeometry *geom = new BspNodeGeometry();
	867	ConstructGeometry(mRoot, *geom);
[463]	868
[587]	869	BspTraversalData tData(mRoot,
	870	polys,
	871	0,
[590]	872	GetOrCreateOutOfBoundsCell(),
[587]	873	rays,
	874	ComputePvsSize(*rays),
	875	mUseAreaForPvs ? geom->GetArea() : geom->GetVolume(),
	876	geom);
[463]	877
[611]	878	mTotalCost = tData.mPvs * tData.mProbability / mBox.GetVolume();
	879	mTotalPvsSize = tData.mPvs;
	880
	881	mSubdivisionStats
	882	<< "#ViewCells\n1\n" << endl
	883	<< "#RenderCostDecrease\n0\n" << endl
	884	<< "#TotalRenderCost\n" << mTotalCost << endl
	885	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
	886
[463]	887	tStack.push(tData);
	888
[611]	889	// used for intermediate time measurements and progress
	890	long interTime = GetTime();
	891	int nleaves = 500;
	892
[463]	893	mStat.Start();
[667]	894	cout << "Constructing bsp tree ...\n";
[463]	895	long startTime = GetTime();
	896	while (!tStack.empty())
	897	{
	898	tData = tStack.top();
	899
	900	tStack.pop();
	901
	902	// subdivide leaf node
	903	BspNode *r = Subdivide(tStack, tData);
	904
	905	if (r == mRoot)
[587]	906	Debug << "BSP tree construction time spent at root: "
	907	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl;
[611]	908
	909	if (mStat.Leaves() >= nleaves)
	910	{
	911	nleaves += 500;
	912
	913	cout << "leaves=" << mStat.Leaves() << endl;
	914	Debug << "needed "
	915	<< TimeDiff(interTime, GetTime())*1e-3
	916	<< " secs to create 500 leaves" << endl;
	917	interTime = GetTime();
	918	}
[463]	919	}
	920
	921	cout << "finished\n";
	922
	923	mStat.Stop();
	924	}
	925
[600]	926
[463]	927	bool BspTree::TerminationCriteriaMet(const BspTraversalData &data) const
	928	{
	929	return
	930	(((int)data.mPolygons->size() <= mTermMinPolys) \|\|
	931	((int)data.mRays->size() <= mTermMinRays) \|\|
	932	(data.mPvs <= mTermMinPvs) \|\|
[587]	933	(data.mProbability <= mTermMinProbability) \|\|
[463]	934	(data.mDepth >= mTermMaxDepth) \|\|
[587]	935	(mStat.Leaves() >= mMaxViewCells) \|\|
	936	(data.GetAvgRayContribution() > mTermMaxRayContribution));
[463]	937	}
	938
[600]	939
[463]	940	BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData)
	941	{
	942	//-- terminate traversal
	943	if (TerminationCriteriaMet(tData))
	944	{
	945	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
	946
	947	BspViewCell *viewCell;
	948
	949	// generate new view cell for each leaf
	950	if (mGenerateViewCells)
[1027]	951	{
[463]	952	viewCell = new BspViewCell();
[1027]	953	}
[463]	954	else
[1027]	955	{
[463]	956	// add view cell to leaf
	957	viewCell = dynamic_cast<BspViewCell *>(tData.mViewCell);
[1027]	958	}
	959
[463]	960	leaf->SetViewCell(viewCell);
[580]	961	viewCell->mLeaf = leaf;
[463]	962
[676]	963	//float probability = max(0.0f, tData.mProbability);
	964	float probability = tData.mProbability;
[675]	965
[587]	966	if (mUseAreaForPvs)
[675]	967	viewCell->SetArea(probability);
[587]	968	else
[675]	969	viewCell->SetVolume(probability);
	970
[463]	971	//-- add pvs
[590]	972	if (viewCell != mOutOfBoundsCell)
[463]	973	{
	974	int conSamp = 0, sampCon = 0;
	975	AddToPvs(leaf, *tData.mRays, conSamp, sampCon);
	976
	977	mStat.contributingSamples += conSamp;
	978	mStat.sampleContributions += sampCon;
	979	}
	980
[1027]	981	if (1)
	982	EvaluateLeafStats(tData);
[463]	983
	984	//-- clean up
	985
	986	// discard polygons
	987	CLEAR_CONTAINER(*tData.mPolygons);
	988	// discard rays
	989	CLEAR_CONTAINER(*tData.mRays);
	990
[1027]	991	delete tData.mPolygons;
	992	delete tData.mRays;
	993	delete tData.mGeometry;
[463]	994
	995	return leaf;
	996	}
	997
	998	//-- continue subdivision
	999	PolygonContainer coincident;
	1000
[590]	1001	BspTraversalData tFrontData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
[463]	1002	new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
[590]	1003	BspTraversalData tBackData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
[463]	1004	new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
	1005
[611]	1006
[463]	1007	// create new interior node and two leaf nodes
	1008	BspInterior *interior =
	1009	SubdivideNode(tData, tFrontData, tBackData, coincident);
	1010
	1011
[611]	1012	if (1)
	1013	{
[645]	1014	int pvsData = tData.mPvs;
[648]	1015
[645]	1016	float cData = (float)pvsData * tData.mProbability;
[611]	1017	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	1018	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	1019
[645]	1020	float costDecr = (cFront + cBack - cData) / mBox.GetVolume();
[611]	1021
	1022	mTotalCost += costDecr;
	1023	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - pvsData;
	1024
	1025	mSubdivisionStats
	1026	<< "#ViewCells\n" << mStat.Leaves() << endl
	1027	<< "#RenderCostDecrease\n" << -costDecr << endl
	1028	<< "#TotalRenderCost\n" << mTotalCost << endl
	1029	<< "#AvgRenderCost\n" << mTotalPvsSize / mStat.Leaves() << endl;
	1030	}
	1031
[463]	1032	// extract view cells from coincident polygons according to plane normal
	1033	// only if front or back polygons are empty
	1034	if (!mGenerateViewCells)
	1035	{
	1036	ExtractViewCells(tFrontData,
	1037	tBackData,
	1038	coincident,
	1039	interior->mPlane);
	1040	}
	1041
	1042	// don't need coincident polygons anymory
	1043	CLEAR_CONTAINER(coincident);
	1044
	1045	// push the children on the stack
	1046	tStack.push(tFrontData);
	1047	tStack.push(tBackData);
	1048
	1049	// cleanup
	1050	DEL_PTR(tData.mNode);
	1051
	1052	DEL_PTR(tData.mPolygons);
	1053	DEL_PTR(tData.mRays);
	1054	DEL_PTR(tData.mGeometry);
	1055
	1056	return interior;
	1057	}
	1058
[645]	1059
[463]	1060	void BspTree::ExtractViewCells(BspTraversalData &frontData,
	1061	BspTraversalData &backData,
	1062	const PolygonContainer &coincident,
	1063	const Plane3 &splitPlane) const
	1064	{
	1065	// if not empty, tree is further subdivided => don't have to find view cell
	1066	bool foundFront = !frontData.mPolygons->empty();
	1067	bool foundBack = !frontData.mPolygons->empty();
	1068
	1069	PolygonContainer::const_iterator it =
	1070	coincident.begin(), it_end = coincident.end();
	1071
	1072	//-- find first view cells in front and back leafs
	1073	for (; !(foundFront && foundBack) && (it != it_end); ++ it)
	1074	{
	1075	if (DotProd((*it)->GetNormal(), splitPlane.mNormal) > 0)
	1076	{
[882]	1077	backData.mViewCell = dynamic_cast<ViewCellLeaf >((it)->mParent);
[463]	1078	foundBack = true;
	1079	}
	1080	else
	1081	{
[882]	1082	frontData.mViewCell = dynamic_cast<ViewCellLeaf >((it)->mParent);
[463]	1083	foundFront = true;
	1084	}
	1085	}
	1086	}
	1087
[645]	1088
[463]	1089	BspInterior *BspTree::SubdivideNode(BspTraversalData &tData,
	1090	BspTraversalData &frontData,
	1091	BspTraversalData &backData,
	1092	PolygonContainer &coincident)
	1093	{
	1094	mStat.nodes += 2;
	1095
[1106]	1096	BspLeaf leaf = dynamic_cast<BspLeaf >(tData.mNode);
[463]	1097
	1098	// select subdivision plane
[1106]	1099	BspInterior *interior = new BspInterior(SelectPlane(leaf, tData));
[587]	1100
[611]	1101
[648]	1102	#ifdef _DEBUG
[463]	1103	Debug << interior << endl;
[648]	1104	#endif
[463]	1105
	1106	// subdivide rays into front and back rays
	1107	SplitRays(interior->mPlane, tData.mRays, frontData.mRays, *backData.mRays);
	1108
	1109	// subdivide polygons with plane
[491]	1110	mStat.polySplits += SplitPolygons(interior->GetPlane(),
	1111	*tData.mPolygons,
	1112	*frontData.mPolygons,
	1113	*backData.mPolygons,
	1114	coincident);
[611]	1115
[463]	1116
	1117	// compute pvs
	1118	frontData.mPvs = ComputePvsSize(*frontData.mRays);
	1119	backData.mPvs = ComputePvsSize(*backData.mRays);
	1120
	1121	// split geometry and compute area
	1122	if (1)
	1123	{
	1124	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
	1125	*backData.mGeometry,
	1126	interior->mPlane,
	1127	mBox,
[646]	1128	//0.000000000001);
	1129	mEpsilon);
[463]	1130
	1131
[611]	1132	if (mUseAreaForPvs)
	1133	{
	1134	frontData.mProbability = frontData.mGeometry->GetArea();
	1135	backData.mProbability = backData.mGeometry->GetArea();
	1136	}
	1137	else
	1138	{
	1139	frontData.mProbability = frontData.mGeometry->GetVolume();
	1140	backData.mProbability = tData.mProbability - frontData.mProbability;
	1141	}
[463]	1142	}
	1143
	1144	//-- create front and back leaf
	1145
	1146	BspInterior *parent = leaf->GetParent();
	1147
	1148	// replace a link from node's parent
	1149	if (!leaf->IsRoot())
	1150	{
	1151	parent->ReplaceChildLink(leaf, interior);
	1152	interior->SetParent(parent);
	1153	}
	1154	else // new root
	1155	{
	1156	mRoot = interior;
	1157	}
	1158
	1159	// and setup child links
	1160	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
	1161
	1162	frontData.mNode = interior->GetFront();
	1163	backData.mNode = interior->GetBack();
	1164
[650]	1165	interior->mTimeStamp = mTimeStamp ++;
	1166
[463]	1167	//DEL_PTR(leaf);
	1168	return interior;
	1169	}
	1170
[582]	1171
[1233]	1172	void BspTree::SortSubdivisionCandidates(const PolygonContainer &polys,
[463]	1173	const int axis,
	1174	vector<SortableEntry> &splitCandidates) const
	1175	{
[480]	1176	splitCandidates.clear();
[463]	1177
[480]	1178	int requestedSize = 2 * (int)polys.size();
	1179	// creates a sorted split candidates array
	1180	splitCandidates.reserve(requestedSize);
[463]	1181
[480]	1182	PolygonContainer::const_iterator it, it_end = polys.end();
	1183
	1184	AxisAlignedBox3 box;
	1185
	1186	// insert all queries
	1187	for(it = polys.begin(); it != it_end; ++ it)
	1188	{
	1189	box.Initialize();
	1190	box.Include((it));
	1191
	1192	splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it));
	1193	splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it));
	1194	}
	1195
	1196	stable_sort(splitCandidates.begin(), splitCandidates.end());
[463]	1197	}
	1198
	1199
	1200	float BspTree::BestCostRatio(const PolygonContainer &polys,
	1201	const AxisAlignedBox3 &box,
	1202	const int axis,
	1203	float &position,
	1204	int &objectsBack,
	1205	int &objectsFront) const
	1206	{
	1207	vector<SortableEntry> splitCandidates;
	1208
[1233]	1209	SortSubdivisionCandidates(polys, axis, splitCandidates);
[463]	1210
	1211	// go through the lists, count the number of objects left and right
	1212	// and evaluate the following cost funcion:
	1213	// C = ct_div_ci + (ol + or)/queries
	1214
	1215	int objectsLeft = 0, objectsRight = (int)polys.size();
	1216
	1217	float minBox = box.Min(axis);
	1218	float maxBox = box.Max(axis);
	1219	float boxArea = box.SurfaceArea();
	1220
	1221	float minBand = minBox + mSplitBorder * (maxBox - minBox);
	1222	float maxBand = minBox + (1.0f - mSplitBorder) * (maxBox - minBox);
	1223
	1224	float minSum = 1e20f;
	1225	vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end();
	1226
	1227	for(ci = splitCandidates.begin(); ci != ci_end; ++ ci)
	1228	{
	1229	switch ((*ci).type)
	1230	{
	1231	case SortableEntry::POLY_MIN:
	1232	++ objectsLeft;
	1233	break;
	1234	case SortableEntry::POLY_MAX:
	1235	-- objectsRight;
	1236	break;
	1237	default:
	1238	break;
	1239	}
	1240
	1241	if ((ci).value > minBand && (ci).value < maxBand)
	1242	{
	1243	AxisAlignedBox3 lbox = box;
	1244	AxisAlignedBox3 rbox = box;
	1245	lbox.SetMax(axis, (*ci).value);
	1246	rbox.SetMin(axis, (*ci).value);
	1247
[472]	1248	const float sum = objectsLeft * lbox.SurfaceArea() +
	1249	objectsRight * rbox.SurfaceArea();
[463]	1250
	1251	if (sum < minSum)
	1252	{
	1253	minSum = sum;
	1254	position = (*ci).value;
	1255
	1256	objectsBack = objectsLeft;
	1257	objectsFront = objectsRight;
	1258	}
	1259	}
	1260	}
	1261
[472]	1262	const float oldCost = (float)polys.size();
	1263	const float newCost = mAxisAlignedCtDivCi + minSum / boxArea;
	1264	const float ratio = newCost / oldCost;
[463]	1265
	1266
	1267	#if 0
	1268	Debug << "====================" << endl;
	1269	Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox)
	1270	<< "\t o=(" << objectsBack << "," << objectsFront << ")" << endl;
	1271	#endif
	1272	return ratio;
	1273	}
	1274
	1275	bool BspTree::SelectAxisAlignedPlane(Plane3 &plane,
	1276	const PolygonContainer &polys) const
	1277	{
	1278	AxisAlignedBox3 box;
	1279	box.Initialize();
	1280
	1281	// create bounding box of region
[860]	1282	box.Include(polys);
[463]	1283
	1284	int objectsBack = 0, objectsFront = 0;
	1285	int axis = 0;
	1286	float costRatio = MAX_FLOAT;
	1287	Vector3 position;
	1288
	1289	//-- area subdivision
	1290	for (int i = 0; i < 3; ++ i)
	1291	{
	1292	float p = 0;
	1293	float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront);
	1294
	1295	if (r < costRatio)
	1296	{
	1297	costRatio = r;
	1298	axis = i;
	1299	position = p;
	1300	}
	1301	}
	1302
	1303	if (costRatio >= mMaxCostRatio)
	1304	return false;
	1305
	1306	Vector3 norm(0,0,0); norm[axis] = 1.0f;
	1307	plane = Plane3(norm, position);
	1308
	1309	return true;
	1310	}
	1311
[545]	1312
[463]	1313	Plane3 BspTree::SelectPlane(BspLeaf *leaf, BspTraversalData &data)
	1314	{
[646]	1315	if ((!mMaxPolyCandidates \|\| data.mPolygons->empty()) &&
	1316	(!mMaxRayCandidates \|\| data.mRays->empty()))
[463]	1317	{
	1318	Debug << "Warning: No autopartition polygon candidate available\n";
	1319
	1320	// return axis aligned split
	1321	AxisAlignedBox3 box;
	1322	box.Initialize();
	1323
	1324	// create bounding box of region
[860]	1325	box.Include(*data.mPolygons);
[463]	1326
	1327	const int axis = box.Size().DrivingAxis();
[587]	1328	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
[463]	1329
	1330	Vector3 norm(0,0,0); norm[axis] = 1.0f;
	1331	return Plane3(norm, position);
	1332	}
	1333
	1334	if ((mSplitPlaneStrategy & AXIS_ALIGNED) &&
	1335	((int)data.mPolygons->size() > mTermMinPolysForAxisAligned) &&
	1336	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
	1337	((mTermMinObjectsForAxisAligned < 0) \|\|
[587]	1338	(Polygon3::ParentObjectsSize(*data.mPolygons) > mTermMinObjectsForAxisAligned)))
[463]	1339	{
	1340	Plane3 plane;
	1341	if (SelectAxisAlignedPlane(plane, *data.mPolygons))
	1342	return plane;
	1343	}
	1344
	1345	// simplest strategy: just take next polygon
	1346	if (mSplitPlaneStrategy & RANDOM_POLYGON)
	1347	{
	1348	if (!data.mPolygons->empty())
	1349	{
[478]	1350	Polygon3 *nextPoly =
	1351	(*data.mPolygons)[(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1))];
[463]	1352	return nextPoly->GetSupportingPlane();
	1353	}
	1354	else
	1355	{
[475]	1356	const int candidateIdx = (int)RandomValue(0, (Real)((int)data.mRays->size() - 1));
[463]	1357	BoundedRay bRay = (data.mRays)[candidateIdx];
	1358
	1359	Ray *ray = bRay->mRay;
	1360
	1361	const Vector3 minPt = ray->Extrap(bRay->mMinT);
	1362	const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
	1363
	1364	const Vector3 pt = (maxPt + minPt) * 0.5;
	1365
	1366	const Vector3 normal = ray->GetDir();
	1367
	1368	return Plane3(normal, pt);
	1369	}
	1370
	1371	return Plane3();
	1372	}
	1373
	1374	// use heuristics to find appropriate plane
	1375	return SelectPlaneHeuristics(leaf, data);
	1376	}
	1377
[478]	1378
	1379	Plane3 BspTree::ChooseCandidatePlane(const BoundedRayContainer &rays) const
[479]	1380	{
	1381	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1382	BoundedRay *bRay = rays[candidateIdx];
	1383	Ray *ray = bRay->mRay;
[478]	1384
[479]	1385	const Vector3 minPt = ray->Extrap(bRay->mMinT);
	1386	const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
	1387
[478]	1388	const Vector3 pt = (maxPt + minPt) * 0.5;
	1389
[479]	1390	const Vector3 normal = ray->GetDir();
	1391
	1392	return Plane3(normal, pt);
[478]	1393	}
	1394
	1395	Plane3 BspTree::ChooseCandidatePlane2(const BoundedRayContainer &rays) const
[479]	1396	{
	1397	Vector3 pt[3];
[478]	1398	int idx[3];
	1399	int cmaxT = 0;
	1400	int cminT = 0;
	1401	bool chooseMin = false;
	1402
[479]	1403	for (int j = 0; j < 3; j ++)
[478]	1404	{
[479]	1405	idx[j] = (int)RandomValue(0, Real((int)rays.size() * 2 - 1));
	1406
[478]	1407	if (idx[j] >= (int)rays.size())
	1408	{
[479]	1409	idx[j] -= (int)rays.size();
[478]	1410	chooseMin = (cminT < 2);
	1411	}
	1412	else
	1413	chooseMin = (cmaxT < 2);
	1414
[479]	1415	BoundedRay *bRay = rays[idx[j]];
	1416	pt[j] = chooseMin ? bRay->mRay->Extrap(bRay->mMinT) :
	1417	bRay->mRay->Extrap(bRay->mMaxT);
[478]	1418	}
[479]	1419
	1420	return Plane3(pt[0], pt[1], pt[2]);
[478]	1421	}
	1422
	1423	Plane3 BspTree::ChooseCandidatePlane3(const BoundedRayContainer &rays) const
[479]	1424	{
[478]	1425	Vector3 pt[3];
	1426
	1427	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1428	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1429
	1430	// check if rays different
	1431	if (idx1 == idx2)
	1432	idx2 = (idx2 + 1) % (int)rays.size();
	1433
[479]	1434	const BoundedRay *ray1 = rays[idx1];
	1435	const BoundedRay *ray2 = rays[idx2];
[478]	1436
	1437	// normal vector of the plane parallel to both lines
[479]	1438	const Vector3 norm =
	1439	Normalize(CrossProd(ray1->mRay->GetDir(), ray2->mRay->GetDir()));
[478]	1440
[479]	1441	const Vector3 orig1 = ray1->mRay->Extrap(ray1->mMinT);
	1442	const Vector3 orig2 = ray2->mRay->Extrap(ray2->mMinT);
	1443
[478]	1444	// vector from line 1 to line 2
[479]	1445	const Vector3 vd = orig1 - orig2;
[478]	1446
	1447	// project vector on normal to get distance
	1448	const float dist = DotProd(vd, norm);
	1449
	1450	// point on plane lies halfway between the two planes
[479]	1451	const Vector3 planePt = orig1 + norm * dist * 0.5;
[478]	1452
[479]	1453	return Plane3(norm, planePt);
[478]	1454	}
	1455
	1456
[463]	1457	Plane3 BspTree::SelectPlaneHeuristics(BspLeaf *leaf, BspTraversalData &data)
	1458	{
	1459	float lowestCost = MAX_FLOAT;
	1460	Plane3 bestPlane;
[478]	1461	// intermediate plane
[463]	1462	Plane3 plane;
	1463
[478]	1464	const int limit = Min((int)data.mPolygons->size(), mMaxPolyCandidates);
	1465	int maxIdx = (int)data.mPolygons->size();
[463]	1466
	1467	for (int i = 0; i < limit; ++ i)
	1468	{
[478]	1469	// assure that no index is taken twice
	1470	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
[587]	1471
[463]	1472	Polygon3 poly = (data.mPolygons)[candidateIdx];
[478]	1473
	1474	// swap candidate to the end to avoid testing same plane
	1475	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
	1476	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
	1477
[463]	1478	// evaluate current candidate
	1479	const float candidateCost =
	1480	SplitPlaneCost(poly->GetSupportingPlane(), data);
	1481
	1482	if (candidateCost < lowestCost)
	1483	{
	1484	bestPlane = poly->GetSupportingPlane();
	1485	lowestCost = candidateCost;
	1486	}
	1487	}
	1488
[495]	1489	//-- choose candidate planes extracted from rays
[478]	1490	for (int i = 0; i < mMaxRayCandidates; ++ i)
[463]	1491	{
[478]	1492	plane = ChooseCandidatePlane3(*data.mRays);
[463]	1493	const float candidateCost = SplitPlaneCost(plane, data);
	1494
	1495	if (candidateCost < lowestCost)
	1496	{
[478]	1497	bestPlane = plane;
[463]	1498	lowestCost = candidateCost;
	1499	}
	1500	}
	1501
	1502	#ifdef _DEBUG
	1503	Debug << "plane lowest cost: " << lowestCost << endl;
	1504	#endif
[648]	1505
[463]	1506	return bestPlane;
	1507	}
	1508
	1509
	1510	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1511	const PolygonContainer &polys) const
	1512	{
	1513	float val = 0;
	1514
	1515	float sumBalancedPolys = 0;
	1516	float sumSplits = 0;
	1517	float sumPolyArea = 0;
	1518	float sumBalancedViewCells = 0;
	1519	float sumBlockedRays = 0;
	1520	float totalBlockedRays = 0;
	1521	//float totalArea = 0;
	1522	int totalViewCells = 0;
	1523
	1524	// need three unique ids for each type of view cell
	1525	// for balanced view cells criterium
	1526	ViewCell::NewMail();
	1527	const int backId = ViewCell::sMailId;
	1528	ViewCell::NewMail();
	1529	const int frontId = ViewCell::sMailId;
	1530	ViewCell::NewMail();
	1531	const int frontAndBackId = ViewCell::sMailId;
	1532
[644]	1533	bool useRand;
[463]	1534	int limit;
	1535
	1536	// choose test polyongs randomly if over threshold
	1537	if ((int)polys.size() > mMaxTests)
	1538	{
	1539	useRand = true;
	1540	limit = mMaxTests;
	1541	}
	1542	else
	1543	{
	1544	useRand = false;
	1545	limit = (int)polys.size();
	1546	}
	1547
	1548	for (int i = 0; i < limit; ++ i)
	1549	{
[478]	1550	const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
[463]	1551
	1552	Polygon3 *poly = polys[testIdx];
	1553
	1554	const int classification =
	1555	poly->ClassifyPlane(candidatePlane, mEpsilon);
	1556
	1557	if (mSplitPlaneStrategy & BALANCED_POLYS)
	1558	sumBalancedPolys += sBalancedPolysTable[classification];
	1559
	1560	if (mSplitPlaneStrategy & LEAST_SPLITS)
	1561	sumSplits += sLeastPolySplitsTable[classification];
	1562
	1563	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	1564	{
	1565	if (classification == Polygon3::COINCIDENT)
	1566	sumPolyArea += poly->GetArea();
	1567	//totalArea += area;
	1568	}
	1569
	1570	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	1571	{
	1572	const float blockedRays = (float)poly->mPiercingRays.size();
	1573
	1574	if (classification == Polygon3::COINCIDENT)
	1575	sumBlockedRays += blockedRays;
	1576
	1577	totalBlockedRays += blockedRays;
	1578	}
	1579
	1580	// assign view cells to back or front according to classificaion
	1581	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	1582	{
	1583	MeshInstance *viewCell = poly->mParent;
	1584
	1585	// assure that we only count a view cell
	1586	// once for the front and once for the back side of the plane
	1587	if (classification == Polygon3::FRONT_SIDE)
	1588	{
	1589	if ((viewCell->mMailbox != frontId) &&
	1590	(viewCell->mMailbox != frontAndBackId))
	1591	{
	1592	sumBalancedViewCells += 1.0;
	1593
	1594	if (viewCell->mMailbox != backId)
	1595	viewCell->mMailbox = frontId;
	1596	else
	1597	viewCell->mMailbox = frontAndBackId;
	1598
	1599	++ totalViewCells;
	1600	}
	1601	}
	1602	else if (classification == Polygon3::BACK_SIDE)
	1603	{
	1604	if ((viewCell->mMailbox != backId) &&
	1605	(viewCell->mMailbox != frontAndBackId))
	1606	{
	1607	sumBalancedViewCells -= 1.0;
	1608
	1609	if (viewCell->mMailbox != frontId)
	1610	viewCell->mMailbox = backId;
	1611	else
	1612	viewCell->mMailbox = frontAndBackId;
	1613
	1614	++ totalViewCells;
	1615	}
	1616	}
	1617	}
	1618	}
	1619
	1620	const float polysSize = (float)polys.size() + Limits::Small;
	1621
	1622	// all values should be approx. between 0 and 1 so they can be combined
	1623	// and scaled with the factors according to their importance
	1624	if (mSplitPlaneStrategy & BALANCED_POLYS)
	1625	val += mBalancedPolysFactor * fabs(sumBalancedPolys) / polysSize;
	1626
	1627	if (mSplitPlaneStrategy & LEAST_SPLITS)
	1628	val += mLeastSplitsFactor * sumSplits / polysSize;
	1629
	1630	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	1631	// HACK: polys.size should be total area so scaling is between 0 and 1
	1632	val += mLargestPolyAreaFactor * (float)polys.size() / sumPolyArea;
	1633
	1634	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	1635	if (totalBlockedRays != 0)
	1636	val += mBlockedRaysFactor * (totalBlockedRays - sumBlockedRays) / totalBlockedRays;
	1637
	1638	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	1639	val += mBalancedViewCellsFactor * fabs(sumBalancedViewCells) /
	1640	((float)totalViewCells + Limits::Small);
	1641
	1642	return val;
	1643	}
	1644
	1645
	1646	inline void BspTree::GenerateUniqueIdsForPvs()
	1647	{
[1016]	1648	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
	1649	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
	1650	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
[463]	1651	}
	1652
[551]	1653
[463]	1654	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1655	const BoundedRayContainer &rays,
	1656	const int pvs,
[587]	1657	const float probability,
[463]	1658	const BspNodeGeometry &cell) const
	1659	{
	1660	float val = 0;
	1661
	1662	float sumBalancedRays = 0;
	1663	float sumRaySplits = 0;
	1664
	1665	int frontPvs = 0;
	1666	int backPvs = 0;
	1667
	1668	// probability that view point lies in child
	1669	float pOverall = 0;
	1670	float pFront = 0;
	1671	float pBack = 0;
	1672
	1673	const bool pvsUseLen = false;
	1674
[1016]	1675
[463]	1676	if (mSplitPlaneStrategy & PVS)
	1677	{
	1678	// create unique ids for pvs heuristics
	1679	GenerateUniqueIdsForPvs();
	1680
[587]	1681	// construct child geometry with regard to the candidate split plane
[711]	1682	BspNodeGeometry geomFront;
	1683	BspNodeGeometry geomBack;
[587]	1684
[711]	1685	const bool splitSuccessFull =
	1686	cell.SplitGeometry(geomFront,
	1687	geomBack,
	1688	candidatePlane,
	1689	mBox,
	1690	mEpsilon);
[587]	1691
	1692	if (mUseAreaForPvs)
[463]	1693	{
[711]	1694	pFront = geomFront.GetArea();
	1695	pBack = geomBack.GetArea();
[587]	1696	}
	1697	else
	1698	{
[711]	1699	pFront = geomFront.GetVolume();
[605]	1700	pBack = pOverall - pFront;
[587]	1701	}
	1702
[711]	1703
	1704	// give penalty to unbalanced split
	1705	if (1 &&
	1706	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
	1707	!geomFront.Valid() \|\| !geomBack.Valid()))
	1708	{
[744]	1709	//Debug << "error f: " << pFront << " b: " << pBack << endl;
[711]	1710	return 99999.9f;
	1711	}
[463]	1712
[587]	1713	pOverall = probability;
[463]	1714	}
	1715
[545]	1716	bool useRand;
[463]	1717	int limit;
	1718
	1719	// choose test polyongs randomly if over threshold
	1720	if ((int)rays.size() > mMaxTests)
	1721	{
	1722	useRand = true;
	1723	limit = mMaxTests;
	1724	}
	1725	else
	1726	{
	1727	useRand = false;
	1728	limit = (int)rays.size();
	1729	}
	1730
	1731	for (int i = 0; i < limit; ++ i)
	1732	{
[475]	1733	const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
[463]	1734
	1735	BoundedRay *bRay = rays[testIdx];
	1736
	1737	Ray *ray = bRay->mRay;
	1738	const float minT = bRay->mMinT;
	1739	const float maxT = bRay->mMaxT;
	1740
	1741	Vector3 entP, extP;
	1742
	1743	const int cf =
	1744	ray->ClassifyPlane(candidatePlane, minT, maxT, entP, extP);
	1745
	1746	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	1747	{
	1748	sumBalancedRays += sBalancedRaysTable[cf];
	1749	}
	1750
	1751	if (mSplitPlaneStrategy & BALANCED_RAYS)
	1752	{
	1753	sumRaySplits += sLeastRaySplitsTable[cf];
	1754	}
	1755
	1756	if (mSplitPlaneStrategy & PVS)
	1757	{
	1758	// in case the ray intersects an object
	1759	// assure that we only count the object
	1760	// once for the front and once for the back side of the plane
	1761
	1762	// add the termination object
	1763	if (!ray->intersections.empty())
	1764	AddObjToPvs(ray->intersections[0].mObject, cf, frontPvs, backPvs);
	1765
	1766	// add the source object
	1767	AddObjToPvs(ray->sourceObject.mObject, cf, frontPvs, backPvs);
	1768	}
	1769	}
	1770
	1771	const float raysSize = (float)rays.size() + Limits::Small;
	1772
	1773	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	1774	val += mLeastRaySplitsFactor * sumRaySplits / raysSize;
	1775
	1776	if (mSplitPlaneStrategy & BALANCED_RAYS)
	1777	val += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize;
	1778
[711]	1779	const float denom = pOverall * (float)pvs + Limits::Small;
[463]	1780
	1781	if (mSplitPlaneStrategy & PVS)
	1782	{
	1783	val += mPvsFactor * (frontPvs * pFront + (backPvs * pBack)) / denom;
	1784	}
	1785
	1786
	1787	#ifdef _DEBUG
	1788	Debug << "totalpvs: " << pvs << " ptotal: " << pOverall
	1789	<< " frontpvs: " << frontPvs << " pFront: " << pFront
	1790	<< " backpvs: " << backPvs << " pBack: " << pBack << endl << endl;
	1791	#endif
	1792
	1793	return val;
	1794	}
	1795
	1796	void BspTree::AddObjToPvs(Intersectable *obj,
	1797	const int cf,
	1798	int &frontPvs,
	1799	int &backPvs) const
	1800	{
	1801	if (!obj)
	1802	return;
	1803	// TODO: does this really belong to no pvs?
	1804	//if (cf == Ray::COINCIDENT) return;
	1805
	1806	// object belongs to both PVS
	1807	const bool bothSides = (cf == Ray::FRONT_BACK) \|\|
	1808	(cf == Ray::BACK_FRONT) \|\|
	1809	(cf == Ray::COINCIDENT);
	1810
	1811	if ((cf == Ray::FRONT) \|\| bothSides)
	1812	{
	1813	if ((obj->mMailbox != sFrontId) &&
	1814	(obj->mMailbox != sFrontAndBackId))
	1815	{
	1816	++ frontPvs;
	1817
	1818	if (obj->mMailbox == sBackId)
	1819	obj->mMailbox = sFrontAndBackId;
	1820	else
	1821	obj->mMailbox = sFrontId;
	1822	}
	1823	}
	1824
	1825	if ((cf == Ray::BACK) \|\| bothSides)
	1826	{
	1827	if ((obj->mMailbox != sBackId) &&
	1828	(obj->mMailbox != sFrontAndBackId))
	1829	{
	1830	++ backPvs;
	1831
	1832	if (obj->mMailbox == sFrontId)
	1833	obj->mMailbox = sFrontAndBackId;
	1834	else
	1835	obj->mMailbox = sBackId;
	1836	}
	1837	}
	1838	}
	1839
[644]	1840
[463]	1841	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1842	BspTraversalData &data) const
	1843	{
	1844	float val = 0;
	1845
	1846	if (mSplitPlaneStrategy & VERTICAL_AXIS)
	1847	{
	1848	Vector3 tinyAxis(0,0,0); tinyAxis[mBox.Size().TinyAxis()] = 1.0f;
	1849	// we put a penalty on the dot product between the "tiny" vertical axis
	1850	// and the split plane axis
	1851	val += mVerticalSplitsFactor *
	1852	fabs(DotProd(candidatePlane.mNormal, tinyAxis));
	1853	}
	1854
	1855	// the following criteria loop over all polygons to find the cost value
	1856	if ((mSplitPlaneStrategy & BALANCED_POLYS) \|\|
	1857	(mSplitPlaneStrategy & LEAST_SPLITS) \|\|
	1858	(mSplitPlaneStrategy & LARGEST_POLY_AREA) \|\|
	1859	(mSplitPlaneStrategy & BALANCED_VIEW_CELLS) \|\|
	1860	(mSplitPlaneStrategy & BLOCKED_RAYS))
	1861	{
	1862	val += SplitPlaneCost(candidatePlane, *data.mPolygons);
	1863	}
	1864
	1865	// the following criteria loop over all rays to find the cost value
	1866	if ((mSplitPlaneStrategy & BALANCED_RAYS) \|\|
	1867	(mSplitPlaneStrategy & LEAST_RAY_SPLITS) \|\|
	1868	(mSplitPlaneStrategy & PVS))
	1869	{
	1870	val += SplitPlaneCost(candidatePlane, *data.mRays, data.mPvs,
[587]	1871	data.mProbability, *data.mGeometry);
[463]	1872	}
	1873
	1874	// return linear combination of the sums
	1875	return val;
	1876	}
	1877
	1878	void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) const
	1879	{
	1880	stack<BspNode *> nodeStack;
	1881	nodeStack.push(mRoot);
	1882
	1883	while (!nodeStack.empty())
	1884	{
	1885	BspNode *node = nodeStack.top();
	1886
	1887	nodeStack.pop();
	1888
	1889	if (node->IsLeaf())
	1890	{
	1891	BspLeaf leaf = (BspLeaf )node;
	1892	leaves.push_back(leaf);
	1893	}
	1894	else
	1895	{
	1896	BspInterior interior = dynamic_cast<BspInterior >(node);
	1897
	1898	nodeStack.push(interior->GetBack());
	1899	nodeStack.push(interior->GetFront());
	1900	}
	1901	}
	1902	}
	1903
[487]	1904
[463]	1905	AxisAlignedBox3 BspTree::GetBoundingBox() const
	1906	{
	1907	return mBox;
	1908	}
	1909
[487]	1910
[463]	1911	void BspTree::EvaluateLeafStats(const BspTraversalData &data)
	1912	{
	1913	// the node became a leaf -> evaluate stats for leafs
	1914	BspLeaf leaf = dynamic_cast<BspLeaf >(data.mNode);
	1915
	1916	// store maximal and minimal depth
	1917	if (data.mDepth > mStat.maxDepth)
	1918	mStat.maxDepth = data.mDepth;
	1919
	1920	if (data.mDepth < mStat.minDepth)
	1921	mStat.minDepth = data.mDepth;
	1922
	1923	// accumulate depth to compute average depth
	1924	mStat.accumDepth += data.mDepth;
[503]	1925	// accumulate rays to compute rays / leaf
	1926	mStat.accumRays += (int)data.mRays->size();
[463]	1927
	1928	if (data.mDepth >= mTermMaxDepth)
	1929	++ mStat.maxDepthNodes;
	1930
	1931	if (data.mPvs < mTermMinPvs)
	1932	++ mStat.minPvsNodes;
	1933
	1934	if ((int)data.mRays->size() < mTermMinRays)
	1935	++ mStat.minRaysNodes;
	1936
	1937	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
	1938	++ mStat.maxRayContribNodes;
	1939
[587]	1940	if (data.mProbability <= mTermMinProbability)
[547]	1941	++ mStat.minProbabilityNodes;
[463]	1942
	1943	#ifdef _DEBUG
	1944	Debug << "BSP stats: "
	1945	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
	1946	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
[587]	1947	<< "Probability: " << data.mProbability << " (min: " << mTermMinProbability << "), "
[463]	1948	<< "#polygons: " << (int)data.mPolygons->size() << " (max: " << mTermMinPolys << "), "
	1949	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
[1168]	1950	<< "#pvs: " << leaf->GetViewCell()->GetPvs().CountObjectsInPvs() << "=, "
[463]	1951	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
	1952	#endif
	1953	}
	1954
[711]	1955
	1956	int BspTree::_CastRay(Ray &ray)
[463]	1957	{
	1958	int hits = 0;
	1959
	1960	stack<BspRayTraversalData> tStack;
	1961
	1962	float maxt, mint;
	1963
	1964	if (!mBox.GetRaySegment(ray, mint, maxt))
	1965	return 0;
	1966
[611]	1967	ViewCell::NewMail();
[463]	1968
	1969	Vector3 entp = ray.Extrap(mint);
	1970	Vector3 extp = ray.Extrap(maxt);
	1971
	1972	BspNode *node = mRoot;
	1973	BspNode *farChild = NULL;
	1974
	1975	while (1)
	1976	{
	1977	if (!node->IsLeaf())
	1978	{
	1979	BspInterior in = dynamic_cast<BspInterior >(node);
	1980
	1981	Plane3 splitPlane = in->GetPlane();
	1982	const int entSide = splitPlane.Side(entp);
	1983	const int extSide = splitPlane.Side(extp);
	1984
	1985	if (entSide < 0)
	1986	{
	1987	node = in->GetBack();
	1988
	1989	if(extSide <= 0) // plane does not split ray => no far child
	1990	continue;
	1991
	1992	farChild = in->GetFront(); // plane splits ray
	1993
	1994	} else if (entSide > 0)
	1995	{
	1996	node = in->GetFront();
	1997
	1998	if (extSide >= 0) // plane does not split ray => no far child
	1999	continue;
	2000
	2001	farChild = in->GetBack(); // plane splits ray
	2002	}
	2003	else // ray and plane are coincident
	2004	{
	2005	// WHAT TO DO IN THIS CASE ?
	2006	//break;
	2007	node = in->GetFront();
	2008	continue;
	2009	}
	2010
	2011	// push data for far child
	2012	tStack.push(BspRayTraversalData(farChild, extp, maxt));
	2013
	2014	// find intersection of ray segment with plane
	2015	float t;
	2016	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
	2017	maxt *= t;
	2018
	2019	} else // reached leaf => intersection with view cell
	2020	{
	2021	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	2022
	2023	if (!leaf->mViewCell->Mailed())
	2024	{
[645]	2025	//ray.bspIntersections.push_back(Ray::BspIntersection(maxt, leaf));
[463]	2026	leaf->mViewCell->Mail();
	2027	++ hits;
	2028	}
	2029
	2030	//-- fetch the next far child from the stack
	2031	if (tStack.empty())
	2032	break;
	2033
	2034	entp = extp;
	2035	mint = maxt; // NOTE: need this?
	2036
	2037	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
	2038	break;
	2039
	2040	BspRayTraversalData &s = tStack.top();
	2041
	2042	node = s.mNode;
	2043	extp = s.mExitPoint;
	2044	maxt = s.mMaxT;
	2045
	2046	tStack.pop();
	2047	}
	2048	}
	2049
	2050	return hits;
	2051	}
	2052
[466]	2053
[468]	2054	int BspTree::CastLineSegment(const Vector3 &origin,
	2055	const Vector3 &termination,
[882]	2056	ViewCellContainer &viewcells)
[466]	2057	{
[483]	2058	int hits = 0;
	2059	stack<BspRayTraversalData> tStack;
	2060
[873]	2061	float mint = 0.0f, maxt = 1.0f;
[483]	2062
[1291]	2063	//ViewCell::NewMail();
[483]	2064
	2065	Vector3 entp = origin;
	2066	Vector3 extp = termination;
	2067
	2068	BspNode *node = mRoot;
	2069	BspNode *farChild = NULL;
	2070
[719]	2071
[666]	2072	const float thresh = 1 ? 1e-6f : 0.0f;
	2073
[483]	2074	while (1)
	2075	{
	2076	if (!node->IsLeaf())
	2077	{
	2078	BspInterior in = dynamic_cast<BspInterior >(node);
[719]	2079
[483]	2080	Plane3 splitPlane = in->GetPlane();
	2081
[666]	2082	const int entSide = splitPlane.Side(entp, thresh);
	2083	const int extSide = splitPlane.Side(extp, thresh);
[483]	2084
	2085	if (entSide < 0)
	2086	{
	2087	node = in->GetBack();
[719]	2088
	2089	// plane does not split ray => no far child
	2090	if (extSide <= 0)
[483]	2091	continue;
[719]	2092
[483]	2093	farChild = in->GetFront(); // plane splits ray
	2094	}
[719]	2095	else if (entSide > 0)
[483]	2096	{
	2097	node = in->GetFront();
[719]	2098
[483]	2099	if (extSide >= 0) // plane does not split ray => no far child
	2100	continue;
[719]	2101
	2102	farChild = in->GetBack(); // plane splits ray
[483]	2103	}
[719]	2104	else // one of the ray end points is on the plane
	2105	{ // NOTE: what to do if ray is coincident with plane?
[645]	2106	if (extSide < 0)
	2107	node = in->GetBack();
[694]	2108	else //if (extSide > 0)
[645]	2109	node = in->GetFront();
[719]	2110	//else break; // coincident => count no intersections
[694]	2111
[645]	2112	continue; // no far child
[483]	2113	}
[719]	2114
[483]	2115	// push data for far child
	2116	tStack.push(BspRayTraversalData(farChild, extp, maxt));
	2117
	2118	// find intersection of ray segment with plane
	2119	float t;
	2120	extp = splitPlane.FindIntersection(origin, extp, &t);
	2121	maxt *= t;
	2122	}
	2123	else
	2124	{
	2125	// reached leaf => intersection with view cell
	2126	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	2127
	2128	if (!leaf->mViewCell->Mailed())
	2129	{
	2130	viewcells.push_back(leaf->mViewCell);
	2131	leaf->mViewCell->Mail();
[1291]	2132	++ hits;
[483]	2133	}
	2134
	2135	//-- fetch the next far child from the stack
	2136	if (tStack.empty())
	2137	break;
	2138
	2139	entp = extp;
	2140	mint = maxt; // NOTE: need this?
	2141
	2142	BspRayTraversalData &s = tStack.top();
	2143
	2144	node = s.mNode;
	2145	extp = s.mExitPoint;
	2146	maxt = s.mMaxT;
	2147
	2148	tStack.pop();
[466]	2149	}
	2150	}
[719]	2151
[483]	2152	return hits;
[466]	2153	}
	2154
[463]	2155
	2156	void BspTree::CollectViewCells(ViewCellContainer &viewCells) const
	2157	{
	2158	stack<BspNode *> nodeStack;
	2159	nodeStack.push(mRoot);
	2160
	2161	ViewCell::NewMail();
	2162
	2163	while (!nodeStack.empty())
	2164	{
	2165	BspNode *node = nodeStack.top();
	2166	nodeStack.pop();
	2167
	2168	if (node->IsLeaf())
	2169	{
[882]	2170	ViewCellLeaf viewCell = dynamic_cast<BspLeaf >(node)->mViewCell;
[463]	2171
	2172	if (!viewCell->Mailed())
	2173	{
	2174	viewCell->Mail();
	2175	viewCells.push_back(viewCell);
	2176	}
	2177	}
	2178	else
	2179	{
	2180	BspInterior interior = dynamic_cast<BspInterior >(node);
	2181
	2182	nodeStack.push(interior->GetFront());
	2183	nodeStack.push(interior->GetBack());
	2184	}
	2185	}
	2186	}
	2187
	2188
	2189	BspTreeStatistics &BspTree::GetStat()
	2190	{
	2191	return mStat;
	2192	}
	2193
[479]	2194
[463]	2195	float BspTree::AccumulatedRayLength(BoundedRayContainer &rays) const
	2196	{
	2197	float len = 0;
	2198
	2199	BoundedRayContainer::const_iterator it, it_end = rays.end();
	2200
	2201	for (it = rays.begin(); it != it_end; ++ it)
	2202	{
	2203	len += SqrDistance((it)->mRay->Extrap((it)->mMinT),
	2204	(it)->mRay->Extrap((it)->mMaxT));
	2205	}
	2206
	2207	return len;
	2208	}
	2209
[479]	2210
[463]	2211	int BspTree::SplitRays(const Plane3 &plane,
	2212	BoundedRayContainer &rays,
	2213	BoundedRayContainer &frontRays,
	2214	BoundedRayContainer &backRays)
	2215	{
	2216	int splits = 0;
[473]	2217
[463]	2218	while (!rays.empty())
	2219	{
	2220	BoundedRay *bRay = rays.back();
	2221	Ray *ray = bRay->mRay;
	2222	float minT = bRay->mMinT;
	2223	float maxT = bRay->mMaxT;
	2224
	2225	rays.pop_back();
	2226
	2227	Vector3 entP, extP;
	2228
	2229	const int cf =
	2230	ray->ClassifyPlane(plane, minT, maxT, entP, extP);
	2231
	2232	// set id to ray classification
	2233	ray->SetId(cf);
	2234
	2235	switch (cf)
	2236	{
	2237	case Ray::COINCIDENT: // TODO: should really discard ray?
	2238	frontRays.push_back(bRay);
	2239	//DEL_PTR(bRay);
	2240	break;
	2241	case Ray::BACK:
	2242	backRays.push_back(bRay);
	2243	break;
	2244	case Ray::FRONT:
	2245	frontRays.push_back(bRay);
	2246	break;
	2247	case Ray::FRONT_BACK:
	2248	{
	2249	// find intersection of ray segment with plane
	2250	const float t = plane.FindT(ray->GetLoc(), extP);
	2251
	2252	const float newT = t * maxT;
	2253
	2254	frontRays.push_back(new BoundedRay(ray, minT, newT));
	2255	backRays.push_back(new BoundedRay(ray, newT, maxT));
	2256
	2257	DEL_PTR(bRay);
	2258	}
	2259	break;
	2260	case Ray::BACK_FRONT:
	2261	{
	2262	// find intersection of ray segment with plane
	2263	const float t = plane.FindT(ray->GetLoc(), extP);
	2264	const float newT = t * bRay->mMaxT;
	2265
	2266	backRays.push_back(new BoundedRay(ray, minT, newT));
	2267	frontRays.push_back(new BoundedRay(ray, newT, maxT));
	2268
	2269	DEL_PTR(bRay);
	2270
	2271	++ splits;
	2272	}
	2273	break;
	2274	default:
	2275	Debug << "Should not come here 4" << endl;
	2276	break;
	2277	}
	2278	}
	2279
	2280	return splits;
	2281	}
	2282
	2283	void BspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
	2284	{
	2285	BspNode *lastNode;
[678]	2286
[463]	2287	do
	2288	{
	2289	lastNode = n;
	2290
	2291	// want to get planes defining geometry of this node => don't take
	2292	// split plane of node itself
	2293	n = n->GetParent();
[719]	2294
[463]	2295	if (n)
	2296	{
	2297	BspInterior interior = dynamic_cast<BspInterior >(n);
	2298	Plane3 halfSpace = dynamic_cast<BspInterior *>(interior)->GetPlane();
	2299
[683]	2300	if (interior->GetBack() != lastNode)
[463]	2301	halfSpace.ReverseOrientation();
	2302
	2303	halfSpaces.push_back(halfSpace);
	2304	}
	2305	}
	2306	while (n);
	2307	}
	2308
	2309
	2310
[587]	2311	void BspTree::ConstructGeometry(ViewCell *vc,
	2312	BspNodeGeometry &vcGeom) const
[589]	2313	{
[587]	2314	ViewCellContainer leaves;
[600]	2315	mViewCellsTree->CollectLeaves(vc, leaves);
[587]	2316
	2317	ViewCellContainer::const_iterator it, it_end = leaves.end();
	2318
[463]	2319	for (it = leaves.begin(); it != it_end; ++ it)
[587]	2320	{
	2321	BspLeaf l = dynamic_cast<BspViewCell >(*it)->mLeaf;
	2322	ConstructGeometry(l, vcGeom);
	2323	}
[463]	2324	}
	2325
	2326
[683]	2327	void BspTree::ConstructGeometry(BspNode *n,
	2328	BspNodeGeometry &geom) const
[587]	2329	{
[463]	2330	vector<Plane3> halfSpaces;
	2331	ExtractHalfSpaces(n, halfSpaces);
	2332
[683]	2333	PolygonContainer candidatePolys;
[678]	2334	vector<Plane3> candidatePlanes;
[463]	2335
[719]	2336	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
	2337
[683]	2338	// bounded planes are added to the polygons
[719]	2339	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
[463]	2340	{
[719]	2341	Polygon3 p = GetBoundingBox().CrossSection(pit);
[683]	2342
[463]	2343	if (p->Valid(mEpsilon))
	2344	{
[683]	2345	candidatePolys.push_back(p);
[719]	2346	candidatePlanes.push_back(*pit);
[463]	2347	}
	2348	}
	2349
	2350	// add faces of bounding box (also could be faces of the cell)
	2351	for (int i = 0; i < 6; ++ i)
	2352	{
	2353	VertexContainer vertices;
[683]	2354
[463]	2355	for (int j = 0; j < 4; ++ j)
	2356	vertices.push_back(mBox.GetFace(i).mVertices[j]);
	2357
[678]	2358	Polygon3 *poly = new Polygon3(vertices);
[683]	2359
	2360	candidatePolys.push_back(poly);
[678]	2361	candidatePlanes.push_back(poly->GetSupportingPlane());
[463]	2362	}
	2363
[683]	2364	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
[463]	2365	{
	2366	// polygon is split by all other planes
[683]	2367	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
[463]	2368	{
	2369	if (i == j) // polygon and plane are coincident
	2370	continue;
	2371
	2372	VertexContainer splitPts;
	2373	Polygon3 frontPoly, backPoly;
	2374
[683]	2375	const int cf =
	2376	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
	2377	mEpsilon);
	2378
[463]	2379	switch (cf)
	2380	{
	2381	case Polygon3::SPLIT:
	2382	frontPoly = new Polygon3();
	2383	backPoly = new Polygon3();
	2384
[683]	2385	candidatePolys[i]->Split(halfSpaces[j],
	2386	*frontPoly,
	2387	*backPoly,
	2388	mEpsilon);
[463]	2389
[683]	2390	DEL_PTR(candidatePolys[i]);
[463]	2391
[719]	2392	if (backPoly->Valid(mEpsilon))
	2393	candidatePolys[i] = backPoly;
[463]	2394	else
[719]	2395	DEL_PTR(backPoly);
[463]	2396
[719]	2397	// outside, don't need this
	2398	DEL_PTR(frontPoly);
[463]	2399	break;
[683]	2400	// polygon outside of halfspace
	2401	case Polygon3::FRONT_SIDE:
	2402	DEL_PTR(candidatePolys[i]);
[463]	2403	break;
	2404	// just take polygon as it is
[683]	2405	case Polygon3::BACK_SIDE:
[463]	2406	case Polygon3::COINCIDENT:
	2407	default:
	2408	break;
	2409	}
	2410	}
[683]	2411
	2412	if (candidatePolys[i])
[678]	2413	{
[683]	2414	geom.Add(candidatePolys[i], candidatePlanes[i]);
[678]	2415	}
[463]	2416	}
	2417	}
	2418
	2419
[683]	2420	void BspTree::SetViewCellsManager(ViewCellsManager *vcm)
	2421	{
	2422	mViewCellsManager = vcm;
	2423	}
	2424
	2425
[587]	2426	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
	2427
	2428
[726]	2429	int BspTree::FindNeighbors(BspNode *n,
	2430	vector<BspLeaf *> &neighbors,
[463]	2431	const bool onlyUnmailed) const
	2432	{
[587]	2433	stack<bspNodePair> nodeStack;
	2434
	2435	BspNodeGeometry nodeGeom;
	2436	ConstructGeometry(n, nodeGeom);
	2437
	2438	// split planes from the root to this node
	2439	// needed to verify that we found neighbor leaf
	2440	// TODO: really needed?
[463]	2441	vector<Plane3> halfSpaces;
	2442	ExtractHalfSpaces(n, halfSpaces);
	2443
[587]	2444
	2445	BspNodeGeometry *rgeom = new BspNodeGeometry();
	2446	ConstructGeometry(mRoot, *rgeom);
	2447
	2448	nodeStack.push(bspNodePair(mRoot, rgeom));
	2449
	2450	while (!nodeStack.empty())
[463]	2451	{
[587]	2452	BspNode *node = nodeStack.top().first;
	2453	BspNodeGeometry *geom = nodeStack.top().second;
	2454
[463]	2455	nodeStack.pop();
	2456
	2457	if (node->IsLeaf())
	2458	{
[587]	2459	// test if this leaf is in valid view space
	2460	if (node->TreeValid() &&
	2461	(node != n) &&
	2462	(!onlyUnmailed \|\| !node->Mailed()))
[463]	2463	{
	2464	bool isAdjacent = true;
[587]	2465
	2466	if (1)
[463]	2467	{
[587]	2468	// test all planes of current node if still adjacent
	2469	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
	2470	{
	2471	const int cf =
[678]	2472	Polygon3::ClassifyPlane(geom->GetPolys(),
[587]	2473	halfSpaces[i],
	2474	mEpsilon);
[463]	2475
[683]	2476	if (cf == Polygon3::FRONT_SIDE)
[587]	2477	{
	2478	isAdjacent = false;
	2479	}
	2480	}
[463]	2481	}
[587]	2482	else
	2483	{
	2484	// TODO: why is this wrong??
	2485	// test all planes of current node if still adjacent
[678]	2486	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
[587]	2487	{
[678]	2488	Polygon3 *poly = nodeGeom.GetPolys()[i];
[463]	2489
[587]	2490	const int cf =
[678]	2491	Polygon3::ClassifyPlane(geom->GetPolys(),
[587]	2492	poly->GetSupportingPlane(),
	2493	mEpsilon);
	2494
[683]	2495	if (cf == Polygon3::FRONT_SIDE)
[587]	2496	{
	2497	isAdjacent = false;
	2498	}
	2499	}
	2500	}
	2501	// neighbor was found
[463]	2502	if (isAdjacent)
[587]	2503	{
[463]	2504	neighbors.push_back(dynamic_cast<BspLeaf *>(node));
[587]	2505	}
[463]	2506	}
	2507	}
[587]	2508	else
[463]	2509	{
	2510	BspInterior interior = dynamic_cast<BspInterior >(node);
[587]	2511
[678]	2512	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
[587]	2513	interior->GetPlane(),
[463]	2514	mEpsilon);
[587]	2515
	2516	BspNode *front = interior->GetFront();
	2517	BspNode *back = interior->GetBack();
	2518
	2519	BspNodeGeometry *fGeom = new BspNodeGeometry();
	2520	BspNodeGeometry *bGeom = new BspNodeGeometry();
[463]	2521
[587]	2522	geom->SplitGeometry(*fGeom,
	2523	*bGeom,
	2524	interior->GetPlane(),
	2525	mBox,
[683]	2526	//0.0000001f);
[587]	2527	mEpsilon);
	2528
[683]	2529	if (cf == Polygon3::BACK_SIDE)
[587]	2530	{
[683]	2531	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	2532	DEL_PTR(fGeom);
[587]	2533	}
[463]	2534	else
[587]	2535	{
[683]	2536	if (cf == Polygon3::FRONT_SIDE)
[463]	2537	{
[683]	2538	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	2539	DEL_PTR(bGeom);
[463]	2540	}
[587]	2541	else
	2542	{ // random decision
	2543	nodeStack.push(bspNodePair(front, fGeom));
	2544	nodeStack.push(bspNodePair(back, bGeom));
	2545	}
	2546	}
[463]	2547	}
[587]	2548
	2549	DEL_PTR(geom);
[463]	2550	}
[587]	2551
[463]	2552	return (int)neighbors.size();
	2553	}
	2554
[503]	2555
[463]	2556	BspLeaf *BspTree::GetRandomLeaf(const bool onlyUnmailed)
	2557	{
	2558	stack<BspNode *> nodeStack;
	2559
	2560	nodeStack.push(mRoot);
	2561
	2562	int mask = rand();
	2563
	2564	while (!nodeStack.empty())
	2565	{
	2566	BspNode *node = nodeStack.top();
	2567	nodeStack.pop();
	2568
	2569	if (node->IsLeaf())
	2570	{
	2571	if ( (!onlyUnmailed \|\| !node->Mailed()) )
	2572	return dynamic_cast<BspLeaf *>(node);
	2573	}
	2574	else
	2575	{
	2576	BspInterior interior = dynamic_cast<BspInterior >(node);
	2577
	2578	// random decision
	2579	if (mask & 1)
	2580	nodeStack.push(interior->GetBack());
	2581	else
	2582	nodeStack.push(interior->GetFront());
	2583
	2584	mask = mask >> 1;
	2585	}
	2586	}
	2587
	2588	return NULL;
	2589	}
	2590
[587]	2591
[463]	2592	void BspTree::AddToPvs(BspLeaf *leaf,
	2593	const BoundedRayContainer &rays,
	2594	int &sampleContributions,
	2595	int &contributingSamples)
	2596	{
	2597	sampleContributions = 0;
	2598	contributingSamples = 0;
	2599
	2600	BoundedRayContainer::const_iterator it, it_end = rays.end();
	2601
[882]	2602	ViewCellLeaf *vc = leaf->GetViewCell();
[463]	2603
	2604	// add contributions from samples to the PVS
	2605	for (it = rays.begin(); it != it_end; ++ it)
	2606	{
	2607	int contribution = 0;
	2608	Ray ray = (it)->mRay;
[466]	2609	float relContribution;
[463]	2610	if (!ray->intersections.empty())
[556]	2611	contribution += vc->GetPvs().AddSample(ray->intersections[0].mObject,
	2612	1.0f,
	2613	relContribution);
[463]	2614
	2615	if (ray->sourceObject.mObject)
[556]	2616	contribution += vc->GetPvs().AddSample(ray->sourceObject.mObject,
	2617	1.0f,
	2618	relContribution);
	2619
[463]	2620	if (contribution)
	2621	{
	2622	sampleContributions += contribution;
	2623	++ contributingSamples;
	2624	}
	2625
	2626	//if (ray->mFlags & Ray::STORE_BSP_INTERSECTIONS)
	2627	// ray->bspIntersections.push_back(Ray::BspIntersection((*it)->mMinT, this));
	2628	}
	2629	}
	2630
[587]	2631
[463]	2632	int BspTree::ComputePvsSize(const BoundedRayContainer &rays) const
	2633	{
	2634	int pvsSize = 0;
	2635
	2636	BoundedRayContainer::const_iterator rit, rit_end = rays.end();
	2637
	2638	Intersectable::NewMail();
	2639
	2640	for (rit = rays.begin(); rit != rays.end(); ++ rit)
	2641	{
	2642	Ray ray = (rit)->mRay;
	2643
	2644	if (!ray->intersections.empty())
	2645	{
	2646	if (!ray->intersections[0].mObject->Mailed())
	2647	{
	2648	ray->intersections[0].mObject->Mail();
	2649	++ pvsSize;
	2650	}
	2651	}
	2652	if (ray->sourceObject.mObject)
	2653	{
	2654	if (!ray->sourceObject.mObject->Mailed())
	2655	{
	2656	ray->sourceObject.mObject->Mail();
	2657	++ pvsSize;
	2658	}
	2659	}
	2660	}
	2661
	2662	return pvsSize;
	2663	}
	2664
[587]	2665
[463]	2666	float BspTree::GetEpsilon() const
	2667	{
	2668	return mEpsilon;
	2669	}
	2670
	2671
[587]	2672	int BspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
	2673	vector<MergeCandidate> &candidates)
	2674	{
	2675	BspLeaf::NewMail();
	2676
	2677	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
[463]	2678
[587]	2679	int numCandidates = 0;
[503]	2680
[587]	2681	// find merge candidates and push them into queue
	2682	for (it = leaves.begin(); it != it_end; ++ it)
	2683	{
	2684	BspLeaf leaf = it;
	2685
	2686	// the same leaves must not be part of two merge candidates
	2687	leaf->Mail();
	2688	vector<BspLeaf *> neighbors;
	2689	FindNeighbors(leaf, neighbors, true);
	2690
	2691	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
	2692
	2693	// TODO: test if at least one ray goes from one leaf to the other
	2694	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
	2695	{
	2696	if ((*nit)->GetViewCell() != leaf->GetViewCell())
	2697	{
	2698	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
	2699	candidates.push_back(mc);
	2700
	2701	++ numCandidates;
	2702	if ((numCandidates % 1000) == 0)
	2703	{
	2704	cout << "collected " << numCandidates << " merge candidates" << endl;
	2705	}
	2706	}
	2707	}
	2708	}
	2709
	2710	Debug << "merge queue: " << (int)candidates.size() << endl;
	2711	Debug << "leaves in queue: " << numCandidates << endl;
	2712
	2713
	2714	return (int)leaves.size();
	2715	}
	2716
	2717
	2718	int BspTree::CollectMergeCandidates(const VssRayContainer &rays,
	2719	vector<MergeCandidate> &candidates)
	2720	{
	2721	ViewCell::NewMail();
	2722	long startTime = GetTime();
	2723
	2724	map<BspLeaf , vector<BspLeaf> > neighborMap;
	2725	ViewCellContainer::const_iterator iit;
	2726
	2727	int numLeaves = 0;
	2728
	2729	BspLeaf::NewMail();
	2730
	2731	for (int i = 0; i < (int)rays.size(); ++ i)
	2732	{
	2733	VssRay *ray = rays[i];
	2734
	2735	// traverse leaves stored in the rays and compare and
	2736	// merge consecutive leaves (i.e., the neighbors in the tree)
	2737	if (ray->mViewCells.size() < 2)
	2738	continue;
[590]	2739
[587]	2740	iit = ray->mViewCells.begin();
	2741	BspViewCell bspVc = dynamic_cast<BspViewCell >(*(iit ++));
	2742	BspLeaf *leaf = bspVc->mLeaf;
	2743
	2744	// traverse intersections
	2745	// consecutive leaves are neighbors => add them to queue
	2746	for (; iit != ray->mViewCells.end(); ++ iit)
	2747	{
	2748	// next pair
	2749	BspLeaf *prevLeaf = leaf;
	2750	bspVc = dynamic_cast<BspViewCell >(iit);
	2751	leaf = bspVc->mLeaf;
	2752
	2753	// view space not valid or same view cell
	2754	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
	2755	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
	2756	continue;
	2757
	2758	vector<BspLeaf *> &neighbors = neighborMap[leaf];
	2759
	2760	bool found = false;
	2761
	2762	// both leaves inserted in queue already =>
	2763	// look if double pair already exists
	2764	if (leaf->Mailed() && prevLeaf->Mailed())
	2765	{
	2766	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
	2767
	2768	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
	2769	if (*it == prevLeaf)
	2770	found = true; // already in queue
	2771	}
	2772
	2773	if (!found)
	2774	{
	2775	// this pair is not in map yet
	2776	// => insert into the neighbor map and the queue
	2777	neighbors.push_back(prevLeaf);
	2778	neighborMap[prevLeaf].push_back(leaf);
	2779
	2780	leaf->Mail();
	2781	prevLeaf->Mail();
	2782
	2783	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
	2784
	2785	candidates.push_back(mc);
	2786
	2787	if (((int)candidates.size() % 1000) == 0)
	2788	{
	2789	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
	2790	}
	2791	}
	2792	}
	2793	}
	2794
	2795	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
	2796	Debug << "merge queue: " << (int)candidates.size() << endl;
	2797	Debug << "leaves in queue: " << numLeaves << endl;
	2798
	2799
	2800	//-- collect the leaves which haven't been found by ray casting
	2801	#if 0
	2802	cout << "finding additional merge candidates using geometry" << endl;
	2803	vector<BspLeaf *> leaves;
	2804	CollectLeaves(leaves, true);
	2805	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
	2806	CollectMergeCandidates(leaves, candidates);
	2807	#endif
	2808
	2809	return numLeaves;
	2810	}
	2811
	2812
	2813
	2814
	2815	/***************************************************************/
	2816	/* BspNodeGeometry Implementation */
	2817	/***************************************************************/
	2818
	2819
[508]	2820	BspNodeGeometry::BspNodeGeometry(const BspNodeGeometry &rhs)
	2821	{
[574]	2822	mPolys.reserve(rhs.mPolys.size());
[710]	2823	mPlanes.reserve(rhs.mPolys.size());
	2824
[508]	2825	PolygonContainer::const_iterator it, it_end = rhs.mPolys.end();
[678]	2826
	2827	int i = 0;
	2828
[710]	2829	for (it = rhs.mPolys.begin(); it != it_end; ++ it, ++i)
[508]	2830	{
	2831	Polygon3 poly = it;
[710]	2832	Add(new Polygon3(*poly), rhs.mPlanes[i]);
[508]	2833	}
	2834	}
	2835
[574]	2836
[710]	2837	BspNodeGeometry& BspNodeGeometry::operator=(const BspNodeGeometry& g)
	2838	{
	2839	if (this == &g)
	2840	return *this;
	2841
	2842	CLEAR_CONTAINER(mPolys);
	2843
	2844	mPolys.reserve(g.mPolys.size());
	2845	mPlanes.reserve(g.mPolys.size());
	2846
	2847	PolygonContainer::const_iterator it, it_end = g.mPolys.end();
	2848
	2849	int i = 0;
	2850
	2851	for (it = g.mPolys.begin(); it != it_end; ++ it, ++ i)
	2852	{
	2853	Polygon3 poly = it;
	2854	Add(new Polygon3(*poly), g.mPlanes[i]);
	2855	}
	2856
	2857	return *this;
	2858	}
	2859
	2860
	2861	BspNodeGeometry::BspNodeGeometry(const PolygonContainer &polys)
	2862	{
	2863	mPolys = polys;
	2864	mPlanes.reserve(polys.size());
	2865
	2866	PolygonContainer::const_iterator it, it_end = polys.end();
	2867
	2868	for (it = polys.begin(); it != it_end; ++ it)
	2869	{
	2870	Polygon3 poly = it;
	2871	mPlanes.push_back(poly->GetSupportingPlane());
	2872	}
	2873	}
	2874
	2875
[463]	2876	BspNodeGeometry::~BspNodeGeometry()
	2877	{
	2878	CLEAR_CONTAINER(mPolys);
	2879	}
	2880
[503]	2881
[678]	2882	int BspNodeGeometry::Size() const
	2883	{
	2884	return (int)mPolys.size();
	2885	}
	2886
	2887
	2888	const PolygonContainer &BspNodeGeometry::GetPolys()
	2889	{
	2890	return mPolys;
	2891	}
	2892
	2893
	2894	void BspNodeGeometry::Add(Polygon3 *p, const Plane3 &plane)
	2895	{
	2896	mPolys.push_back(p);
	2897	mPlanes.push_back(plane);
	2898	}
	2899
	2900
[463]	2901	float BspNodeGeometry::GetArea() const
	2902	{
	2903	return Polygon3::GetArea(mPolys);
	2904	}
	2905
[503]	2906
[544]	2907	float BspNodeGeometry::GetVolume() const
	2908	{
	2909	//-- compute volume using tetrahedralization of the geometry
	2910	// and adding the volume of the single tetrahedrons
	2911	float volume = 0;
	2912	const float f = 1.0f / 6.0f;
	2913
	2914	PolygonContainer::const_iterator pit, pit_end = mPolys.end();
	2915
[545]	2916	// note: can take arbitrary point, e.g., the origin. However,
[587]	2917	// we rather take the center of mass to prevents precision errors
[545]	2918	const Vector3 center = CenterOfMass();
	2919
[544]	2920	for (pit = mPolys.begin(); pit != pit_end; ++ pit)
	2921	{
	2922	Polygon3 poly = pit;
[545]	2923	const Vector3 v0 = poly->mVertices[0] - center;
[544]	2924
	2925	for (int i = 1; i < (int)poly->mVertices.size() - 1; ++ i)
	2926	{
[545]	2927	const Vector3 v1 = poly->mVertices[i] - center;
	2928	const Vector3 v2 = poly->mVertices[i + 1] - center;
	2929
[678]	2930	// more robust version using abs and the center of mass
	2931	volume += fabs (f * (DotProd(v0, CrossProd(v1, v2))));
[544]	2932	}
	2933	}
	2934
	2935	return volume;
	2936	}
	2937
	2938
[697]	2939	void BspNodeGeometry::GetBoundingBox(AxisAlignedBox3 &box) const
	2940	{
	2941	box.Initialize();
[860]	2942	box.Include(mPolys);
[697]	2943	}
	2944
	2945
[710]	2946	int BspNodeGeometry::Side(const Plane3 &plane, const float eps) const
[697]	2947	{
	2948	PolygonContainer::const_iterator it, it_end = mPolys.end();
	2949
	2950	bool onFrontSide = false;
	2951	bool onBackSide = false;
	2952
	2953	for (it = mPolys.begin(); it != it_end; ++ it)
	2954	{
[710]	2955	const int side = (*it)->Side(plane, eps);
[697]	2956
	2957	if (side == -1)
	2958	onBackSide = true;
	2959	else if (side == 1)
	2960	onFrontSide = true;
	2961
	2962	if ((side == 0) \|\| (onBackSide && onFrontSide))
	2963	return 0;
	2964	}
	2965
	2966	if (onFrontSide)
	2967	return 1;
	2968
	2969	return -1;
	2970	}
	2971
	2972
	2973	int BspNodeGeometry::ComputeIntersection(const AxisAlignedBox3 &box) const
	2974	{
[704]	2975	// 1: box does not intersect geometry
	2976	// 0: box intersects geometry
	2977	// -1: box contains geometry
	2978
[697]	2979	AxisAlignedBox3 boundingBox;
	2980	GetBoundingBox(boundingBox);
	2981
	2982	// no intersections with bounding box
[704]	2983	if (!Overlap(box, boundingBox))
[697]	2984	{
	2985	return 1;
	2986	}
	2987
[704]	2988	// box cotains bounding box of geometry >=> contains geometry
	2989	if (box.Includes(boundingBox))
	2990	return -1;
	2991
	2992	int result = 0;
	2993
	2994	// test geometry planes for intersections
	2995	vector<Plane3>::const_iterator it, it_end = mPlanes.end();
	2996
	2997	for (it = mPlanes.begin(); it != it_end; ++ it)
[697]	2998	{
[704]	2999	const int side = box.Side(*it);
[697]	3000
	3001	// box does not intersects geometry
	3002	if (side == 1)
[704]	3003	{
[697]	3004	return 1;
[704]	3005	}
	3006	//if (side == 0) result = 0;
[697]	3007	}
	3008
	3009	return result;
	3010	}
	3011
	3012
[545]	3013	Vector3 BspNodeGeometry::CenterOfMass() const
[544]	3014	{
	3015	int n = 0;
	3016
	3017	Vector3 center(0,0,0);
	3018
	3019	PolygonContainer::const_iterator pit, pit_end = mPolys.end();
	3020
	3021	for (pit = mPolys.begin(); pit != pit_end; ++ pit)
	3022	{
	3023	Polygon3 poly = pit;
	3024
	3025	VertexContainer::const_iterator vit, vit_end = poly->mVertices.end();
	3026
	3027	for(vit = poly->mVertices.begin(); vit != vit_end; ++ vit)
	3028	{
	3029	center += *vit;
	3030	++ n;
	3031	}
	3032	}
	3033
[679]	3034	//Debug << "center: " << center << " new " << center / (float)n << endl;
	3035
[544]	3036	return center / (float)n;
	3037	}
	3038
	3039
[678]	3040	bool BspNodeGeometry::Valid() const
	3041	{
	3042	if (mPolys.size() < 4)
	3043	return false;
	3044
	3045	return true;
	3046	}
	3047
[840]	3048	void IncludeNodeGeomInMesh(const BspNodeGeometry &geom, Mesh &mesh)
[503]	3049	{
[840]	3050	// add single polygons to mesh
	3051	PolygonContainer::const_iterator it, it_end = geom.mPolys.end();
[508]	3052
[840]	3053	for (it = geom.mPolys.begin(); it != geom.mPolys.end(); ++ it)
[503]	3054	{
[840]	3055	Polygon3 poly = (it);
	3056	IncludePolyInMesh(*poly, mesh);
[503]	3057	}
	3058	}
	3059
	3060
[679]	3061	bool BspNodeGeometry::SplitGeometry(BspNodeGeometry &front,
[463]	3062	BspNodeGeometry &back,
	3063	const Plane3 &splitPlane,
	3064	const AxisAlignedBox3 &box,
	3065	const float epsilon) const
	3066	{
[711]	3067	//-- trivial cases
	3068	if (0)
	3069	{
	3070	const int cf = Side(splitPlane, epsilon);
[710]	3071
[711]	3072	if (cf == -1)
	3073	{
	3074	back = *this;
	3075	return false;
	3076	}
	3077	else if (cf == 1)
	3078	{
	3079	front = *this;
	3080	return false;
	3081	}
[710]	3082	}
	3083
[463]	3084	// get cross section of new polygon
	3085	Polygon3 *planePoly = box.CrossSection(splitPlane);
[710]	3086
[463]	3087	// split polygon with all other polygons
	3088	planePoly = SplitPolygon(planePoly, epsilon);
	3089
[682]	3090	bool splitsGeom = (planePoly != NULL);
[681]	3091
[463]	3092	//-- new polygon splits all other polygons
[679]	3093	for (int i = 0; i < (int)mPolys.size()/* && planePoly*/; ++ i)
[463]	3094	{
	3095	/// don't use epsilon here to get exact split planes
	3096	const int cf =
[676]	3097	mPolys[i]->ClassifyPlane(splitPlane, epsilon);
[463]	3098
	3099	switch (cf)
	3100	{
	3101	case Polygon3::SPLIT:
	3102	{
	3103	Polygon3 *poly = new Polygon3(mPolys[i]->mVertices);
	3104
	3105	Polygon3 *frontPoly = new Polygon3();
	3106	Polygon3 *backPoly = new Polygon3();
	3107
	3108	poly->Split(splitPlane,
	3109	*frontPoly,
	3110	*backPoly,
	3111	epsilon);
	3112
	3113	DEL_PTR(poly);
	3114
	3115	if (frontPoly->Valid(epsilon))
[678]	3116	{
	3117	front.Add(frontPoly, mPlanes[i]);
	3118	}
[463]	3119	else
[678]	3120	{
[681]	3121	//Debug << "no f! " << endl;
[463]	3122	DEL_PTR(frontPoly);
[678]	3123	}
[679]	3124
[463]	3125	if (backPoly->Valid(epsilon))
[678]	3126	{
	3127	back.Add(backPoly, mPlanes[i]);
	3128	}
[463]	3129	else
[678]	3130	{
[681]	3131	//Debug << "no b! " << endl;
[463]	3132	DEL_PTR(backPoly);
[678]	3133	}
[463]	3134	}
	3135
	3136	break;
	3137	case Polygon3::BACK_SIDE:
[678]	3138	back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3139	break;
	3140	case Polygon3::FRONT_SIDE:
[678]	3141	front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3142	break;
[678]	3143	// only put into back container (split should have no effect ...)
[463]	3144	case Polygon3::COINCIDENT:
[684]	3145	//Debug << "error should not come here" << endl;
[681]	3146	splitsGeom = false;
[678]	3147
[683]	3148	if (DotProd(mPlanes[i].mNormal, splitPlane.mNormal > 0))
[681]	3149	back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
	3150	else
	3151	front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3152	break;
	3153	default:
	3154	break;
	3155	}
	3156	}
	3157
	3158	//-- finally add the new polygon to the child node geometries
	3159	if (planePoly)
	3160	{
[683]	3161	// add polygon with reverse orientation to front cell
[682]	3162	Plane3 reversePlane(splitPlane);
	3163	reversePlane.ReverseOrientation();
	3164
[463]	3165	// add polygon with normal pointing into positive half space to back cell
[678]	3166	back.Add(planePoly, splitPlane);
	3167	//back.mPolys.push_back(planePoly);
[683]	3168
[682]	3169	Polygon3 *reversePoly = planePoly->CreateReversePolygon();
	3170	front.Add(reversePoly, reversePlane);
[684]	3171	//Debug << "poly normal : " << reversePoly->GetSupportingPlane().mNormal << " split plane normal " << reversePlane.mNormal << endl;
[463]	3172	}
[684]	3173
[679]	3174
[681]	3175	return splitsGeom;
[463]	3176	}
	3177
[574]	3178
[463]	3179	Polygon3 BspNodeGeometry::SplitPolygon(Polygon3 planePoly,
	3180	const float epsilon) const
	3181	{
	3182	if (!planePoly->Valid(epsilon))
[683]	3183	{
[684]	3184	//Debug << "not valid!!" << endl;
[463]	3185	DEL_PTR(planePoly);
[683]	3186	}
[463]	3187	// polygon is split by all other planes
	3188	for (int i = 0; (i < (int)mPolys.size()) && planePoly; ++ i)
	3189	{
[683]	3190	//Plane3 plane = mPolys[i]->GetSupportingPlane();
[678]	3191	Plane3 plane = mPlanes[i];
[683]	3192
[463]	3193	/// don't use epsilon here to get exact split planes
	3194	const int cf =
[678]	3195	planePoly->ClassifyPlane(plane, epsilon);
[463]	3196
	3197	// split new polygon with all previous planes
	3198	switch (cf)
	3199	{
	3200	case Polygon3::SPLIT:
	3201	{
	3202	Polygon3 *frontPoly = new Polygon3();
	3203	Polygon3 *backPoly = new Polygon3();
	3204
	3205	planePoly->Split(plane,
	3206	*frontPoly,
	3207	*backPoly,
	3208	epsilon);
	3209
	3210	// don't need anymore
	3211	DEL_PTR(planePoly);
	3212	DEL_PTR(frontPoly);
	3213
	3214	// back polygon is belonging to geometry
	3215	if (backPoly->Valid(epsilon))
	3216	planePoly = backPoly;
	3217	else
	3218	DEL_PTR(backPoly);
	3219	}
	3220	break;
	3221	case Polygon3::FRONT_SIDE:
	3222	DEL_PTR(planePoly);
	3223	break;
	3224	// polygon is taken as it is
	3225	case Polygon3::BACK_SIDE:
	3226	case Polygon3::COINCIDENT:
	3227	default:
	3228	break;
	3229	}
	3230	}
	3231
	3232	return planePoly;
	3233	}
[480]	3234
[492]	3235
[679]	3236	ViewCell *BspTree::GetViewCell(const Vector3 &point)
[492]	3237	{
[502]	3238	if (mRoot == NULL)
	3239	return NULL;
	3240
	3241
[492]	3242	stack<BspNode *> nodeStack;
	3243	nodeStack.push(mRoot);
	3244
[882]	3245	ViewCellLeaf *viewcell = NULL;
[492]	3246
	3247	while (!nodeStack.empty()) {
	3248	BspNode *node = nodeStack.top();
	3249	nodeStack.pop();
	3250
	3251	if (node->IsLeaf()) {
	3252	viewcell = dynamic_cast<BspLeaf *>(node)->mViewCell;
	3253	break;
	3254	} else {
	3255
	3256	BspInterior interior = dynamic_cast<BspInterior >(node);
	3257
	3258	// random decision
	3259	if (interior->GetPlane().Side(point) < 0)
	3260	nodeStack.push(interior->GetBack());
	3261	else
	3262	nodeStack.push(interior->GetFront());
	3263	}
	3264	}
	3265
	3266	return viewcell;
	3267	}
	3268
[590]	3269
	3270	bool BspTree::Export(ofstream &stream)
	3271	{
	3272	ExportNode(mRoot, stream);
	3273
	3274	return true;
	3275	}
	3276
	3277
	3278	void BspTree::ExportNode(BspNode *node, ofstream &stream)
	3279	{
	3280	if (node->IsLeaf())
	3281	{
	3282	BspLeaf leaf = dynamic_cast<BspLeaf >(node);
	3283
	3284	int id = -1;
	3285	if (leaf->GetViewCell() != mOutOfBoundsCell)
	3286	id = leaf->GetViewCell()->GetId();
	3287
	3288	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
	3289	}
	3290	else
	3291	{
	3292	BspInterior interior = dynamic_cast<BspInterior >(node);
	3293
	3294	Plane3 plane = interior->GetPlane();
	3295	stream << "<Interior plane=\"" << plane.mNormal.x << " "
	3296	<< plane.mNormal.y << " " << plane.mNormal.z << " "
	3297	<< plane.mD << "\">" << endl;
	3298
	3299	ExportNode(interior->GetBack(), stream);
	3300	ExportNode(interior->GetFront(), stream);
	3301
	3302	stream << "</Interior>" << endl;
	3303	}
	3304	}
[860]	3305
	3306	}

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