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ViewCellBsp.cpp @ 2609

Revision 2609, 83.1 KB checked in by mattausch, 17 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
[1545]	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
[1923]	105
[463]	106	BspInterior::~BspInterior()
	107	{
	108	DEL_PTR(mFront);
	109	DEL_PTR(mBack);
	110	}
	111
	112
	113	void BspInterior::SetupChildLinks(BspNode b, BspNode f)
	114	{
	115	mBack = b;
	116	mFront = f;
	117	}
	118
[710]	119
[463]	120	/****************************************************************/
	121	/* class BspLeaf implementation */
	122	/****************************************************************/
	123
	124
[485]	125	BspLeaf::BspLeaf(): mViewCell(NULL), mPvs(NULL)
[463]	126	{
	127	}
	128
	129
[485]	130	BspLeaf::~BspLeaf()
	131	{
	132	DEL_PTR(mPvs);
[1418]	133
	134	VssRayContainer::const_iterator vit, vit_end = mVssRays.end();
	135	for (vit = mVssRays.begin(); vit != vit_end; ++ vit)
	136	{
	137	VssRay ray = vit;
	138	ray->Unref();
	139
	140	if (!ray->IsActive())
	141	delete ray;
	142	}
[485]	143	}
	144
	145
[882]	146	BspLeaf::BspLeaf(ViewCellLeaf *viewCell):
[463]	147	mViewCell(viewCell)
	148	{
	149	}
	150
	151
	152	BspLeaf::BspLeaf(BspInterior *parent):
[485]	153	BspNode(parent), mViewCell(NULL), mPvs(NULL)
[463]	154	{}
	155
	156
	157
[882]	158	BspLeaf::BspLeaf(BspInterior parent, ViewCellLeaf viewCell):
[485]	159	BspNode(parent), mViewCell(viewCell), mPvs(NULL)
[463]	160	{
	161	}
	162
	163
[580]	164	/*********************************************************************/
	165	/* class BspTree implementation */
	166	/*********************************************************************/
[573]	167
[463]	168	BspTree::BspTree():
	169	mRoot(NULL),
[587]	170	mUseAreaForPvs(false),
[1545]	171	mUsePredefinedViewCells(false),
	172	mTimeStamp(1),
	173	mViewCellsTree(NULL),
[1563]	174	mOutOfBoundsCellPartOfTree(false),
	175	mOutOfBoundsCell(NULL)
[463]	176	{
	177	Randomize(); // initialise random generator for heuristics
[1557]	178	mOutOfBoundsCell = GetOrCreateOutOfBoundsCell();
	179
[1545]	180	/////////
	181	//-- termination criteria for autopartition
[463]	182
[1004]	183	Environment::GetSingleton()->GetIntValue("BspTree.Termination.maxDepth", mTermMaxDepth);
	184	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minPvs", mTermMinPvs);
	185	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minPolygons", mTermMinPolys);
	186	Environment::GetSingleton()->GetIntValue("BspTree.Termination.minRays", mTermMinRays);
	187	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.minProbability", mTermMinProbability);
	188	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.maxRayContribution", mTermMaxRayContribution);
	189	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.minAccRayLenght", mTermMinAccRayLength);
[463]	190
[1545]	191
	192	/////////
[463]	193	//-- factors for bsp tree split plane heuristics
[1545]	194
[1004]	195	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.verticalSplits", mVerticalSplitsFactor);
	196	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.largestPolyArea", mLargestPolyAreaFactor);
	197	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.blockedRays", mBlockedRaysFactor);
	198	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.leastRaySplits", mLeastRaySplitsFactor);
	199	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedRays", mBalancedRaysFactor);
	200	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.pvs", mPvsFactor);
	201	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.leastSplits" , mLeastSplitsFactor);
	202	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedPolys", mBalancedPolysFactor);
	203	Environment::GetSingleton()->GetFloatValue("BspTree.Factor.balancedViewCells", mBalancedViewCellsFactor);
	204	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.ct_div_ci", mCtDivCi);
[463]	205
[1545]	206
	207	///////////
[463]	208	//-- termination criteria for axis aligned split
[1545]	209
[1004]	210	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.AxisAligned.ct_div_ci", mAxisAlignedCtDivCi);
	211	Environment::GetSingleton()->GetFloatValue("BspTree.Termination.maxCostRatio", mMaxCostRatio);
	212	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minPolys",
[463]	213	mTermMinPolysForAxisAligned);
[1004]	214	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minRays",
[463]	215	mTermMinRaysForAxisAligned);
[1004]	216	Environment::GetSingleton()->GetIntValue("BspTree.Termination.AxisAligned.minObjects",
[463]	217	mTermMinObjectsForAxisAligned);
[1545]	218
	219
	220	//////////////
[463]	221	//-- partition criteria
[1545]	222
[1004]	223	Environment::GetSingleton()->GetIntValue("BspTree.maxPolyCandidates", mMaxPolyCandidates);
	224	Environment::GetSingleton()->GetIntValue("BspTree.maxRayCandidates", mMaxRayCandidates);
	225	Environment::GetSingleton()->GetIntValue("BspTree.splitPlaneStrategy", mSplitPlaneStrategy);
	226	Environment::GetSingleton()->GetFloatValue("BspTree.AxisAligned.splitBorder", mSplitBorder);
	227	Environment::GetSingleton()->GetIntValue("BspTree.maxTests", mMaxTests);
	228	Environment::GetSingleton()->GetIntValue("BspTree.Termination.maxViewCells", mMaxViewCells);
[463]	229
[1004]	230	Environment::GetSingleton()->GetFloatValue("BspTree.Construction.epsilon", mEpsilon);
[611]	231
[660]	232	char subdivisionStatsLog[100];
[1004]	233	Environment::GetSingleton()->GetStringValue("BspTree.subdivisionStats", subdivisionStatsLog);
[660]	234	mSubdivisionStats.open(subdivisionStatsLog);
[611]	235
[1545]	236	/////////////////////7
	237
	238	Debug << "BSP options: " << endl;
[463]	239	Debug << "BSP max depth: " << mTermMaxDepth << endl;
	240	Debug << "BSP min PVS: " << mTermMinPvs << endl;
[587]	241	Debug << "BSP min probability: " << mTermMinProbability << endl;
[463]	242	Debug << "BSP max polys: " << mTermMinPolys << endl;
	243	Debug << "BSP max rays: " << mTermMinRays << endl;
	244	Debug << "BSP max polygon candidates: " << mMaxPolyCandidates << endl;
	245	Debug << "BSP max plane candidates: " << mMaxRayCandidates << endl;
	246
	247	Debug << "Split plane strategy: ";
	248	if (mSplitPlaneStrategy & RANDOM_POLYGON)
	249	Debug << "random polygon ";
	250	if (mSplitPlaneStrategy & AXIS_ALIGNED)
	251	Debug << "axis aligned ";
	252	if (mSplitPlaneStrategy & LEAST_SPLITS)
	253	Debug << "least splits ";
	254	if (mSplitPlaneStrategy & BALANCED_POLYS)
	255	Debug << "balanced polygons ";
	256	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	257	Debug << "balanced view cells ";
	258	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	259	Debug << "largest polygon area ";
	260	if (mSplitPlaneStrategy & VERTICAL_AXIS)
	261	Debug << "vertical axis ";
	262	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	263	Debug << "blocked rays ";
	264	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	265	Debug << "least ray splits ";
	266	if (mSplitPlaneStrategy & BALANCED_RAYS)
	267	Debug << "balanced rays ";
	268	if (mSplitPlaneStrategy & PVS)
	269	Debug << "pvs";
	270
	271	Debug << endl;
	272	}
	273
	274
[1558]	275	bool BspTree::IsOutOfBounds(ViewCell *vc) const
	276	{
	277	return vc->GetId() == OUT_OF_BOUNDS_ID;
	278	}
	279
	280
[463]	281	const BspTreeStatistics &BspTree::GetStatistics() const
	282	{
	283	return mStat;
	284	}
	285
	286
[1557]	287	BspViewCell *BspTree::GetOrCreateOutOfBoundsCell()
	288	{
	289	if (!mOutOfBoundsCell)
	290	{
	291	mOutOfBoundsCell = new BspViewCell();
	292	mOutOfBoundsCell->SetId(OUT_OF_BOUNDS_ID);
	293	mOutOfBoundsCell->SetValid(false);
	294	}
	295
	296	return mOutOfBoundsCell;
	297	}
	298
[463]	299	int BspTree::SplitPolygons(const Plane3 &plane,
	300	PolygonContainer &polys,
	301	PolygonContainer &frontPolys,
	302	PolygonContainer &backPolys,
	303	PolygonContainer &coincident) const
	304	{
	305	int splits = 0;
	306
	307	#ifdef _Debug
	308	Debug << "splitting polygons of node " << this << " with plane " << mPlane << endl;
	309	#endif
[648]	310
[574]	311	PolygonContainer::const_iterator it, it_end = polys.end();
	312
	313	for (it = polys.begin(); it != polys.end(); ++ it)
[463]	314	{
[574]	315	Polygon3 poly = it;
	316
[491]	317	//-- classify polygon
[463]	318	const int cf = poly->ClassifyPlane(plane, mEpsilon);
	319
	320	switch (cf)
	321	{
	322	case Polygon3::COINCIDENT:
	323	coincident.push_back(poly);
	324	break;
	325	case Polygon3::FRONT_SIDE:
	326	frontPolys.push_back(poly);
	327	break;
	328	case Polygon3::BACK_SIDE:
	329	backPolys.push_back(poly);
	330	break;
	331	case Polygon3::SPLIT:
	332	{
	333	Polygon3 *front_piece = new Polygon3(poly->mParent);
	334	Polygon3 *back_piece = new Polygon3(poly->mParent);
	335
	336	//-- split polygon into front and back part
	337	poly->Split(plane,
	338	*front_piece,
	339	*back_piece,
	340	mEpsilon);
	341
	342	++ splits; // increase number of splits
	343
	344	//-- inherit rays from parent polygon for blocked ray criterium
	345	poly->InheritRays(front_piece, back_piece);
	346
	347	// check if polygons still valid
	348	if (front_piece->Valid(mEpsilon))
	349	frontPolys.push_back(front_piece);
	350	else
	351	DEL_PTR(front_piece);
	352
	353	if (back_piece->Valid(mEpsilon))
	354	backPolys.push_back(back_piece);
	355	else
	356	DEL_PTR(back_piece);
	357
[1715]	358	#ifdef GTP_DEBUG
[463]	359	Debug << "split " << poly << endl << front_piece << endl << *back_piece << endl;
	360	#endif
	361	DEL_PTR(poly);
	362	}
	363	break;
	364	default:
	365	Debug << "SHOULD NEVER COME HERE\n";
	366	break;
	367	}
	368	}
	369
	370	return splits;
	371	}
	372
	373
	374	void BspTreeStatistics::Print(ostream &app) const
	375	{
	376	app << "===== BspTree statistics ===============\n";
	377
	378	app << setprecision(4);
	379
	380	app << "#N_CTIME ( Construction time [s] )\n" << Time() << " \n";
	381
	382	app << "#N_NODES ( Number of nodes )\n" << nodes << "\n";
	383
	384	app << "#N_INTERIORS ( Number of interior nodes )\n" << Interior() << "\n";
	385
	386	app << "#N_LEAVES ( Number of leaves )\n" << Leaves() << "\n";
	387
[491]	388	app << "#N_POLYSPLITS ( Number of polygon splits )\n" << polySplits << "\n";
[463]	389
[491]	390	app << "#AXIS_ALIGNED_SPLITS (number of axis aligned splits)\n" << splits[0] + splits[1] + splits[2] << endl;
	391
[667]	392	app << "#N_SPLITS ( Number of splits in axes x y z)\n";
[491]	393
	394	for (int i = 0; i < 3; ++ i)
	395	app << splits[i] << " ";
	396	app << endl;
	397
[463]	398	app << "#N_PMAXDEPTHLEAVES ( Percentage of leaves at maximum depth )\n"
	399	<< maxDepthNodes * 100 / (double)Leaves() << endl;
	400
	401	app << "#N_PMINPVSLEAVES ( Percentage of leaves with mininimal PVS )\n"
	402	<< minPvsNodes * 100 / (double)Leaves() << endl;
	403
	404	app << "#N_PMINRAYSLEAVES ( Percentage of leaves with minimal number of rays)\n"
[473]	405	<< minRaysNodes * 100 / (double)Leaves() << endl;
[463]	406
[473]	407	app << "#N_MAXCOSTNODES ( Percentage of leaves with terminated because of max cost ratio )\n"
	408	<< maxCostNodes * 100 / (double)Leaves() << endl;
	409
[600]	410	app << "#N_PMINPROBABILITYLEAVES ( Percentage of leaves with mininum probability )\n"
[547]	411	<< minProbabilityNodes * 100 / (double)Leaves() << endl;
[463]	412
	413	app << "#N_PMAXRAYCONTRIBLEAVES ( Percentage of leaves with maximal ray contribution )\n"
	414	<< maxRayContribNodes * 100 / (double)Leaves() << endl;
	415
	416	app << "#N_PMAXDEPTH ( Maximal reached depth )\n" << maxDepth << endl;
	417
	418	app << "#N_PMINDEPTH ( Minimal reached depth )\n" << minDepth << endl;
	419
	420	app << "#AVGDEPTH ( average depth )\n" << AvgDepth() << endl;
	421
[490]	422	app << "#N_INPUTPOLYGONS (number of input polygons )\n" << polys << endl;
[463]	423
[490]	424	app << "#N_INVALIDLEAVES (number of invalid leaves )\n" << invalidLeaves << endl;
	425
[503]	426	app << "#N_RAYS (number of rays / leaf)\n" << AvgRays() << endl;
[463]	427	//app << "#N_PVS: " << pvs << endl;
	428
	429	app << "#N_ROUTPUT_INPUT_POLYGONS ( ratio polygons after subdivision / input polygons )\n" <<
[491]	430	(polys + polySplits) / (double)polys << endl;
[463]	431
	432	app << "===== END OF BspTree statistics ==========\n";
	433	}
	434
	435
	436	BspTree::~BspTree()
	437	{
	438	DEL_PTR(mRoot);
[1545]	439
[1923]	440	if (!mOutOfBoundsCellPartOfTree)
[1545]	441	{
	442	// out of bounds cell not part of tree =>
	443	// delete manually
	444	DEL_PTR(mOutOfBoundsCell);
[1557]	445	}
[463]	446	}
	447
	448
[590]	449	BspNode *BspTree::GetRoot() const
	450	{
	451	return mRoot;
	452	}
	453
[711]	454
[1545]	455	void BspTree::SetViewCellsTree(ViewCellsTree *viewCellsTree)
[590]	456	{
[1545]	457	mViewCellsTree = viewCellsTree;
[590]	458	}
	459
	460
[882]	461	void BspTree::InsertViewCell(ViewCellLeaf *viewCell)
[463]	462	{
[1545]	463	// don't generate new view cell, insert this view cell
	464	mUsePredefinedViewCells = true;
[463]	465	PolygonContainer *polys = new PolygonContainer();
	466
	467	// extract polygons that guide the split process
	468	mStat.polys += AddMeshToPolygons(viewCell->GetMesh(), *polys, viewCell);
[1545]	469	mBbox.Include(viewCell->GetBox()); // add to BSP aabb
[463]	470
	471	InsertPolygons(polys);
	472	}
	473
[590]	474
[463]	475	void BspTree::InsertPolygons(PolygonContainer *polys)
	476	{
[472]	477	BspTraversalStack tStack;
[463]	478
	479	// traverse existing tree or create new tree
	480	if (!mRoot)
	481	mRoot = new BspLeaf();
	482
[473]	483	tStack.push(BspTraversalData(mRoot,
	484	polys,
	485	0,
[590]	486	mOutOfBoundsCell,
[473]	487	new BoundedRayContainer(),
	488	0,
[1545]	489	mUseAreaForPvs ? mBbox.SurfaceArea() : mBbox.GetVolume(),
[473]	490	new BspNodeGeometry()));
[463]	491
	492	while (!tStack.empty())
	493	{
	494	// filter polygons donw the tree
	495	BspTraversalData tData = tStack.top();
	496	tStack.pop();
	497
	498	if (!tData.mNode->IsLeaf())
	499	{
[2017]	500	BspInterior interior = static_cast<BspInterior >(tData.mNode);
[463]	501
[1545]	502	///////////////////
[463]	503	//-- filter view cell polygons down the tree until a leaf is reached
	504	if (!tData.mPolygons->empty())
	505	{
	506	PolygonContainer *frontPolys = new PolygonContainer();
	507	PolygonContainer *backPolys = new PolygonContainer();
	508	PolygonContainer coincident;
	509
	510	int splits = 0;
	511
	512	// split viewcell polygons with respect to split plane
	513	splits += SplitPolygons(interior->GetPlane(),
	514	*tData.mPolygons,
	515	*frontPolys,
	516	*backPolys,
	517	coincident);
	518
	519	// extract view cells associated with the split polygons
[1545]	520	ViewCellLeaf *frontViewCell = mOutOfBoundsCell;
	521	ViewCellLeaf *backViewCell = mOutOfBoundsCell;
[463]	522
	523	BspTraversalData frontData(interior->GetFront(),
	524	frontPolys,
	525	tData.mDepth + 1,
[590]	526	mOutOfBoundsCell,
[463]	527	tData.mRays,
	528	tData.mPvs,
[1545]	529	mUseAreaForPvs ? mBbox.SurfaceArea() : mBbox.GetVolume(),
[463]	530	new BspNodeGeometry());
	531
	532	BspTraversalData backData(interior->GetBack(),
	533	backPolys,
	534	tData.mDepth + 1,
[590]	535	mOutOfBoundsCell,
[463]	536	tData.mRays,
	537	tData.mPvs,
[1545]	538	mUseAreaForPvs ? mBbox.SurfaceArea() : mBbox.GetVolume(),
[463]	539	new BspNodeGeometry());
	540
[1545]	541	if (mUsePredefinedViewCells)
[463]	542	{
	543	ExtractViewCells(frontData,
	544	backData,
	545	coincident,
	546	interior->mPlane);
	547	}
	548
	549	// don't need coincident polygons anymore
	550	CLEAR_CONTAINER(coincident);
	551
[491]	552	mStat.polySplits += splits;
[463]	553
	554	// push the children on the stack
	555	tStack.push(frontData);
	556	tStack.push(backData);
	557	}
	558
	559	// cleanup
	560	DEL_PTR(tData.mPolygons);
	561	DEL_PTR(tData.mRays);
	562	}
	563	else
	564	{
	565	// reached leaf => subdivide current viewcell
	566	BspNode *subRoot = Subdivide(tStack, tData);
	567	}
	568	}
	569	}
	570
[710]	571
[463]	572	int BspTree::AddMeshToPolygons(Mesh *mesh,
	573	PolygonContainer &polys,
	574	MeshInstance *parent)
	575	{
[710]	576	FaceContainer::const_iterator fi, fi_end = mesh->mFaces.end();
[463]	577
	578	// copy the face data to polygons
[710]	579	for (fi = mesh->mFaces.begin(); fi != fi_end; ++ fi)
[463]	580	{
	581	Polygon3 poly = new Polygon3((fi), mesh);
	582
	583	if (poly->Valid(mEpsilon))
	584	{
	585	poly->mParent = parent; // set parent intersectable
	586	polys.push_back(poly);
	587	}
	588	else
[1545]	589	{
[463]	590	DEL_PTR(poly);
[1545]	591	}
[463]	592	}
	593	return (int)mesh->mFaces.size();
	594	}
	595
[587]	596
[463]	597	int BspTree::AddToPolygonSoup(const ViewCellContainer &viewCells,
	598	PolygonContainer &polys,
	599	int maxObjects)
	600	{
	601	int limit = (maxObjects > 0) ?
	602	Min((int)viewCells.size(), maxObjects) : (int)viewCells.size();
	603
	604	int polysSize = 0;
[1551]	605
[463]	606	for (int i = 0; i < limit; ++ i)
[1551]	607	{
	608	Mesh *mesh = viewCells[i]->GetMesh();
	609
[1545]	610	if (mesh)
[1551]	611	{
[1545]	612	// copy the mesh into polygons and add to BSP tree aabb
	613	mBbox.Include(viewCells[i]->GetBox());
	614	polysSize += AddMeshToPolygons(mesh, polys, viewCells[i]);
[463]	615	}
	616	}
[1551]	617
[463]	618	return polysSize;
	619	}
	620
[587]	621
	622	int BspTree::AddToPolygonSoup(const ObjectContainer &objects,
	623	PolygonContainer &polys,
	624	int maxObjects,
	625	bool addToBbox)
[463]	626	{
[587]	627	int limit = (maxObjects > 0) ?
	628	Min((int)objects.size(), maxObjects) : (int)objects.size();
[1551]	629
[463]	630	for (int i = 0; i < limit; ++i)
[1551]	631	{
[1001]	632	Intersectable *object = objects[i];
[463]	633	Mesh *mesh = NULL;
	634
	635	switch (object->Type()) // extract the meshes
	636	{
	637	case Intersectable::MESH_INSTANCE:
[2017]	638	mesh = static_cast<MeshInstance *>(object)->GetMesh();
[463]	639	break;
	640	case Intersectable::VIEW_CELL:
[2017]	641	mesh = static_cast<ViewCell *>(object)->GetMesh();
[463]	642	break;
[1001]	643	case Intersectable::TRANSFORMED_MESH_INSTANCE:
	644	{
[2017]	645	TransformedMeshInstance mi = static_cast<TransformedMeshInstance >(object);
[1001]	646
[1002]	647	if (!mi->GetMesh())
[1001]	648	break;
[1002]	649	mesh = new Mesh();
	650	mi->GetTransformedMesh(*mesh);
[1001]	651	break;
	652	}
[463]	653	default:
	654	Debug << "intersectable type not supported" << endl;
	655	break;
	656	}
	657
[1545]	658	if (!mesh) continue;
[1551]	659
[1545]	660	// copy the mesh data to polygons
	661	if (addToBbox)
[1551]	662	{
[1545]	663	mBbox.Include(object->GetBox()); // add to BSP tree aabb
	664	}
	665
	666	AddMeshToPolygons(mesh, polys, mOutOfBoundsCell);
	667
	668	// cleanup
	669	if (object->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
[463]	670	{
[1545]	671	DEL_PTR(mesh);
[1001]	672	}
[463]	673	}
	674
	675	return (int)polys.size();
	676	}
	677
[1545]	678
[463]	679	void BspTree::Construct(const ViewCellContainer &viewCells)
	680	{
[1545]	681	// construct hierarchy over the given view cells
	682	mUsePredefinedViewCells = true;
	683
[463]	684	mStat.nodes = 1;
[1545]	685	mBbox.Initialize(); // initialise bsp tree bounding box
[463]	686
	687	// copy view cell meshes into one big polygon soup
	688	PolygonContainer *polys = new PolygonContainer();
	689	mStat.polys = AddToPolygonSoup(viewCells, *polys);
	690
[1545]	691	Exporter *expo = Exporter::GetExporter("dummy2.wrl");
	692	expo->ExportPolygons(*polys);
	693	delete expo;
[463]	694	// construct tree from the view cell polygons
	695	Construct(polys, new BoundedRayContainer());
	696	}
	697
	698
	699	void BspTree::Construct(const ObjectContainer &objects)
	700	{
[1545]	701	// generate new view cells for this type
	702	mUsePredefinedViewCells = false;
	703
[463]	704	mStat.nodes = 1;
[1564]	705	mBbox.Initialize(); // initialise bsp tree bounding box
[463]	706
	707	PolygonContainer *polys = new PolygonContainer();
	708
	709	// copy mesh instance polygons into one big polygon soup
	710	mStat.polys = AddToPolygonSoup(objects, *polys);
	711
	712	// construct tree from polygon soup
	713	Construct(polys, new BoundedRayContainer());
	714	}
	715
[587]	716
[647]	717	void BspTree::PreprocessPolygons(PolygonContainer &polys)
	718	{
	719	// preprocess: throw out polygons coincident to the view space box (not needed)
	720	PolygonContainer boxPolys;
[1545]	721	mBbox.ExtractPolys(boxPolys);
[647]	722	vector<Plane3> boxPlanes;
	723
[648]	724	PolygonContainer::iterator pit, pit_end = boxPolys.end();
	725
	726	// extract planes of box
[1632]	727	// TODO: can be done more elegantly than here
	728	// where we first extract polygons, then compute their planes
[648]	729	for (pit = boxPolys.begin(); pit != pit_end; ++ pit)
[647]	730	{
[648]	731	boxPlanes.push_back((*pit)->GetSupportingPlane());
	732	}
	733
	734	pit_end = polys.end();
	735
	736	for (pit = polys.begin(); pit != pit_end; ++ pit)
	737	{
	738	vector<Plane3>::const_iterator bit, bit_end = boxPlanes.end();
[647]	739
[648]	740	for (bit = boxPlanes.begin(); (bit != bit_end) && (*pit); ++ bit)
	741	{
	742	const int cf = (pit)->ClassifyPlane(bit, mEpsilon);
	743
	744	if (cf == Polygon3::COINCIDENT)
	745	{
	746	DEL_PTR(*pit);
	747	//Debug << "coincident!!" << endl;
	748	}
	749	}
[647]	750	}
[648]	751
	752	// remove deleted entries
	753	for (int i = 0; i < (int)polys.size(); ++ i)
	754	{
	755	while (!polys[i] && (i < (int)polys.size()))
	756	{
	757	swap(polys[i], polys.back());
	758	polys.pop_back();
	759	}
	760	}
[1002]	761
	762	CLEAR_CONTAINER(boxPolys);
[647]	763	}
	764
[648]	765
[587]	766	void BspTree::Construct(const RayContainer &sampleRays,
	767	AxisAlignedBox3 *forcedBoundingBox)
[463]	768	{
[1545]	769	// generate new view cells for this contruction type
	770	mUsePredefinedViewCells = false;
	771
[463]	772	mStat.nodes = 1;
[1545]	773
[587]	774	if (forcedBoundingBox)
[1545]	775	{
	776	mBbox = *forcedBoundingBox;
	777	}
	778	else
	779	{
	780	mBbox.Initialize(); // initialise BSP tree bounding box
	781	}
[587]	782
[463]	783	PolygonContainer *polys = new PolygonContainer();
	784	BoundedRayContainer *rays = new BoundedRayContainer();
	785
	786	RayContainer::const_iterator rit, rit_end = sampleRays.end();
	787
	788	long startTime = GetTime();
	789	Debug << "** Extracting polygons from rays **\n";
	790
	791	std::map<Face , Polygon3 > facePolyMap;
	792
	793	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	794	{
[1545]	795	//////////////
	796	//-- extract polygons intersected by the rays
[463]	797	Ray ray = rit;
	798
	799	// get ray-face intersection. Store polygon representing the rays together
	800	// with rays intersecting the face.
	801	if (!ray->intersections.empty())
	802	{
[2017]	803	MeshInstance obj = static_cast<MeshInstance >(ray->intersections[0].mObject);
[463]	804
[1002]	805	Mesh *mesh;
	806	if (obj->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
	807	{
	808	TransformedMeshInstance *tmobj =
[2017]	809	static_cast<TransformedMeshInstance *>(obj);
[1002]	810
	811	mesh = new Mesh();
	812	tmobj->GetTransformedMesh(*mesh);
	813	}
	814	else // MeshInstance
	815	{
	816	mesh = obj->GetMesh();
	817	}
	818
	819	Face *face = mesh->mFaces[ray->intersections[0].mFace];
[463]	820	std::map<Face , Polygon3 >::iterator it = facePolyMap.find(face);
	821
	822	if (it != facePolyMap.end())
	823	{
	824	//store rays if needed for heuristics
	825	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	826	(*it).second->mPiercingRays.push_back(ray);
	827	}
	828	else
[1002]	829	{
	830	//store rays if needed for heuristics
	831	Polygon3 *poly = new Polygon3(face, mesh);
[463]	832	poly->mParent = obj;
	833	polys->push_back(poly);
	834
	835	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	836	poly->mPiercingRays.push_back(ray);
	837
	838	facePolyMap[face] = poly;
	839	}
[1002]	840
	841	// cleanup
	842	if (obj->Type() == Intersectable::TRANSFORMED_MESH_INSTANCE)
	843	DEL_PTR(mesh);
[463]	844	}
	845	}
[1564]	846	// clear helper structure
	847	// note: memory will not be released using clear!
[463]	848	facePolyMap.clear();
	849
	850	// compute bounding box
[587]	851	if (!forcedBoundingBox)
[1545]	852	{
	853	mBbox.Include(*polys);
	854	}
[463]	855
[1545]	856	////////////
[463]	857	//-- store rays
	858	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	859	{
	860	Ray ray = rit;
	861	ray->SetId(-1); // reset id
	862
	863	float minT, maxT;
[1545]	864	if (mBbox.GetRaySegment(*ray, minT, maxT))
[463]	865	rays->push_back(new BoundedRay(ray, minT, maxT));
	866	}
	867
[648]	868	// throw out bad polygons
	869	PreprocessPolygons(*polys);
[647]	870
[463]	871	mStat.polys = (int)polys->size();
	872
	873	Debug << "** Finished polygon extraction **" << endl;
	874	Debug << (int)polys->size() << " polys extracted from " << (int)sampleRays.size() << " rays" << endl;
	875	Debug << "extraction time: " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
	876
	877	Construct(polys, rays);
	878	}
	879
[587]	880
	881	void BspTree::Construct(const ObjectContainer &objects,
	882	const RayContainer &sampleRays,
	883	AxisAlignedBox3 *forcedBoundingBox)
[463]	884	{
[1545]	885	// generate new view cells for this construction type
	886	mUsePredefinedViewCells = false;
	887
[463]	888	mStat.nodes = 1;
[1545]	889	mBbox.Initialize(); // initialise BSP tree bounding box
[463]	890
[587]	891	if (forcedBoundingBox)
[1545]	892	{
	893	mBbox = *forcedBoundingBox;
	894	}
[587]	895
[463]	896	BoundedRayContainer *rays = new BoundedRayContainer();
	897	PolygonContainer *polys = new PolygonContainer();
	898
	899	// copy mesh instance polygons into one big polygon soup
[587]	900	mStat.polys = AddToPolygonSoup(objects, *polys, 0, !forcedBoundingBox);
[463]	901
[1545]	902	///////
	903	//-- store rays
[463]	904	RayContainer::const_iterator rit, rit_end = sampleRays.end();
[1545]	905
[463]	906	for (rit = sampleRays.begin(); rit != rit_end; ++ rit)
	907	{
	908	Ray ray = rit;
	909	ray->SetId(-1); // reset id
	910
	911	float minT, maxT;
[1545]	912	if (mBbox.GetRaySegment(*ray, minT, maxT))
[463]	913	rays->push_back(new BoundedRay(ray, minT, maxT));
	914	}
	915
[648]	916	PreprocessPolygons(*polys);
[463]	917	Debug << "tree has " << (int)polys->size() << " polys, " << (int)sampleRays.size() << " rays" << endl;
	918	Construct(polys, rays);
	919	}
	920
[587]	921
[463]	922	void BspTree::Construct(PolygonContainer polys, BoundedRayContainer rays)
	923	{
[472]	924	BspTraversalStack tStack;
[463]	925	mRoot = new BspLeaf();
	926
	927	// constrruct root node geometry
[503]	928	BspNodeGeometry *geom = new BspNodeGeometry();
	929	ConstructGeometry(mRoot, *geom);
[463]	930
[587]	931	BspTraversalData tData(mRoot,
	932	polys,
	933	0,
[1545]	934	mOutOfBoundsCell,
[587]	935	rays,
	936	ComputePvsSize(*rays),
	937	mUseAreaForPvs ? geom->GetArea() : geom->GetVolume(),
	938	geom);
[463]	939
[1545]	940	mTotalCost = tData.mPvs * tData.mProbability / mBbox.GetVolume();
[611]	941	mTotalPvsSize = tData.mPvs;
	942
	943	mSubdivisionStats
	944	<< "#ViewCells\n1\n" << endl
	945	<< "#RenderCostDecrease\n0\n" << endl
	946	<< "#TotalRenderCost\n" << mTotalCost << endl
	947	<< "#AvgRenderCost\n" << mTotalPvsSize << endl;
	948
[463]	949	tStack.push(tData);
	950
[611]	951	// used for intermediate time measurements and progress
	952	long interTime = GetTime();
	953	int nleaves = 500;
	954
[463]	955	mStat.Start();
[667]	956	cout << "Constructing bsp tree ...\n";
[463]	957	long startTime = GetTime();
	958	while (!tStack.empty())
	959	{
	960	tData = tStack.top();
	961	tStack.pop();
	962
	963	// subdivide leaf node
	964	BspNode *r = Subdivide(tStack, tData);
	965
	966	if (r == mRoot)
[587]	967	Debug << "BSP tree construction time spent at root: "
	968	<< TimeDiff(startTime, GetTime())*1e-3 << " secs" << endl;
[611]	969
	970	if (mStat.Leaves() >= nleaves)
	971	{
	972	nleaves += 500;
	973
	974	cout << "leaves=" << mStat.Leaves() << endl;
	975	Debug << "needed "
	976	<< TimeDiff(interTime, GetTime())*1e-3
	977	<< " secs to create 500 leaves" << endl;
	978	interTime = GetTime();
	979	}
[463]	980	}
	981
	982	cout << "finished\n";
	983
	984	mStat.Stop();
	985	}
	986
[600]	987
[463]	988	bool BspTree::TerminationCriteriaMet(const BspTraversalData &data) const
	989	{
	990	return
	991	(((int)data.mPolygons->size() <= mTermMinPolys) \|\|
	992	((int)data.mRays->size() <= mTermMinRays) \|\|
	993	(data.mPvs <= mTermMinPvs) \|\|
[587]	994	(data.mProbability <= mTermMinProbability) \|\|
[463]	995	(data.mDepth >= mTermMaxDepth) \|\|
[587]	996	(mStat.Leaves() >= mMaxViewCells) \|\|
	997	(data.GetAvgRayContribution() > mTermMaxRayContribution));
[463]	998	}
	999
[600]	1000
[463]	1001	BspNode *BspTree::Subdivide(BspTraversalStack &tStack, BspTraversalData &tData)
	1002	{
[1545]	1003	////////
	1004	//-- terminate traversal
	1005
[463]	1006	if (TerminationCriteriaMet(tData))
	1007	{
[2017]	1008	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
[463]	1009
	1010	BspViewCell *viewCell;
	1011
[1545]	1012	if (!mUsePredefinedViewCells)
	1013	{ // generate new view cell for each leaf
[1563]	1014	viewCell = new BspViewCell();cout << "g";
[1027]	1015	}
[463]	1016	else
[1563]	1017	{
[1545]	1018	// add predefined view cell to leaf
[2017]	1019	viewCell = static_cast<BspViewCell *>(tData.mViewCell);
[1686]	1020
	1021	// out of bounds cell can be handled as any other view cell,
	1022	// responsibility for deleting it has the view cells manager.
[1563]	1023	if (IsOutOfBounds(viewCell))
[1557]	1024	{
[1545]	1025	mOutOfBoundsCellPartOfTree = true;
[1557]	1026	}
[1563]	1027
[1027]	1028	}
	1029
[463]	1030	leaf->SetViewCell(viewCell);
[1551]	1031	viewCell->mLeaves.push_back(leaf);
[463]	1032
[676]	1033	//float probability = max(0.0f, tData.mProbability);
	1034	float probability = tData.mProbability;
[675]	1035
[587]	1036	if (mUseAreaForPvs)
[675]	1037	viewCell->SetArea(probability);
[587]	1038	else
[675]	1039	viewCell->SetVolume(probability);
[1545]	1040
	1041	///////////
	1042	//-- add pvs contribution of rays
	1043
[590]	1044	if (viewCell != mOutOfBoundsCell)
[463]	1045	{
	1046	int conSamp = 0, sampCon = 0;
	1047	AddToPvs(leaf, *tData.mRays, conSamp, sampCon);
	1048
	1049	mStat.contributingSamples += conSamp;
	1050	mStat.sampleContributions += sampCon;
	1051	}
	1052
[1563]	1053	if (1) EvaluateLeafStats(tData);
[463]	1054
[1545]	1055	////////
[463]	1056	//-- clean up
[1545]	1057
[463]	1058	// discard polygons
	1059	CLEAR_CONTAINER(*tData.mPolygons);
	1060	// discard rays
	1061	CLEAR_CONTAINER(*tData.mRays);
	1062
[1027]	1063	delete tData.mPolygons;
	1064	delete tData.mRays;
	1065	delete tData.mGeometry;
[463]	1066
	1067	return leaf;
	1068	}
	1069
[1545]	1070	///////////
[463]	1071	//-- continue subdivision
[1545]	1072
[463]	1073	PolygonContainer coincident;
	1074
[590]	1075	BspTraversalData tFrontData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
[463]	1076	new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
[590]	1077	BspTraversalData tBackData(NULL, new PolygonContainer(), tData.mDepth + 1, mOutOfBoundsCell,
[463]	1078	new BoundedRayContainer(), 0, 0, new BspNodeGeometry());
	1079
[611]	1080
[463]	1081	// create new interior node and two leaf nodes
	1082	BspInterior *interior =
	1083	SubdivideNode(tData, tFrontData, tBackData, coincident);
	1084
[611]	1085	if (1)
	1086	{
[645]	1087	int pvsData = tData.mPvs;
[648]	1088
[645]	1089	float cData = (float)pvsData * tData.mProbability;
[611]	1090	float cFront = (float)tFrontData.mPvs * tFrontData.mProbability;
	1091	float cBack = (float)tBackData.mPvs * tBackData.mProbability;
	1092
[1545]	1093	float costDecr = (cFront + cBack - cData) / mBbox.GetVolume();
[611]	1094
	1095	mTotalCost += costDecr;
	1096	mTotalPvsSize += tFrontData.mPvs + tBackData.mPvs - pvsData;
	1097
	1098	mSubdivisionStats
	1099	<< "#ViewCells\n" << mStat.Leaves() << endl
	1100	<< "#RenderCostDecrease\n" << -costDecr << endl
	1101	<< "#TotalRenderCost\n" << mTotalCost << endl
	1102	<< "#AvgRenderCost\n" << mTotalPvsSize / mStat.Leaves() << endl;
	1103	}
	1104
[1545]	1105	// extract view cells from coincident polygons
	1106	// with respect to the orientation of their normal
	1107	// note: if front or back polygons are empty,
	1108	// we get the valid in - out classification for the view cell
	1109
	1110	if (mUsePredefinedViewCells)
[463]	1111	{
	1112	ExtractViewCells(tFrontData,
	1113	tBackData,
	1114	coincident,
	1115	interior->mPlane);
	1116	}
	1117
	1118	// don't need coincident polygons anymory
	1119	CLEAR_CONTAINER(coincident);
	1120
	1121	// push the children on the stack
	1122	tStack.push(tFrontData);
	1123	tStack.push(tBackData);
	1124
[1545]	1125	////////
	1126	//-- cleanup
	1127
[463]	1128	DEL_PTR(tData.mNode);
	1129	DEL_PTR(tData.mPolygons);
	1130	DEL_PTR(tData.mRays);
	1131	DEL_PTR(tData.mGeometry);
	1132
	1133	return interior;
	1134	}
	1135
[645]	1136
[463]	1137	void BspTree::ExtractViewCells(BspTraversalData &frontData,
	1138	BspTraversalData &backData,
	1139	const PolygonContainer &coincident,
	1140	const Plane3 &splitPlane) const
	1141	{
	1142	// if not empty, tree is further subdivided => don't have to find view cell
	1143	bool foundFront = !frontData.mPolygons->empty();
	1144	bool foundBack = !frontData.mPolygons->empty();
	1145
	1146	PolygonContainer::const_iterator it =
	1147	coincident.begin(), it_end = coincident.end();
	1148
[1545]	1149	//////////
[463]	1150	//-- find first view cells in front and back leafs
[1545]	1151
[463]	1152	for (; !(foundFront && foundBack) && (it != it_end); ++ it)
	1153	{
	1154	if (DotProd((*it)->GetNormal(), splitPlane.mNormal) > 0)
	1155	{
[2017]	1156	backData.mViewCell = static_cast<ViewCellLeaf >((it)->mParent);
[463]	1157	foundBack = true;
	1158	}
	1159	else
	1160	{
[2017]	1161	frontData.mViewCell = static_cast<ViewCellLeaf >((it)->mParent);
[463]	1162	foundFront = true;
	1163	}
	1164	}
	1165	}
	1166
[645]	1167
[463]	1168	BspInterior *BspTree::SubdivideNode(BspTraversalData &tData,
	1169	BspTraversalData &frontData,
	1170	BspTraversalData &backData,
	1171	PolygonContainer &coincident)
	1172	{
	1173	mStat.nodes += 2;
	1174
[2017]	1175	BspLeaf leaf = static_cast<BspLeaf >(tData.mNode);
[463]	1176
	1177	// select subdivision plane
[1106]	1178	BspInterior *interior = new BspInterior(SelectPlane(leaf, tData));
[587]	1179
[1715]	1180	#ifdef GTP_DEBUG
[463]	1181	Debug << interior << endl;
[648]	1182	#endif
[463]	1183
	1184	// subdivide rays into front and back rays
	1185	SplitRays(interior->mPlane, tData.mRays, frontData.mRays, *backData.mRays);
	1186
	1187	// subdivide polygons with plane
[491]	1188	mStat.polySplits += SplitPolygons(interior->GetPlane(),
	1189	*tData.mPolygons,
	1190	*frontData.mPolygons,
	1191	*backData.mPolygons,
	1192	coincident);
[611]	1193
[463]	1194
	1195	// compute pvs
	1196	frontData.mPvs = ComputePvsSize(*frontData.mRays);
	1197	backData.mPvs = ComputePvsSize(*backData.mRays);
	1198
	1199	// split geometry and compute area
	1200	if (1)
	1201	{
	1202	tData.mGeometry->SplitGeometry(*frontData.mGeometry,
	1203	*backData.mGeometry,
	1204	interior->mPlane,
[1545]	1205	mBbox,
[646]	1206	//0.000000000001);
	1207	mEpsilon);
[463]	1208
	1209
[611]	1210	if (mUseAreaForPvs)
	1211	{
	1212	frontData.mProbability = frontData.mGeometry->GetArea();
	1213	backData.mProbability = backData.mGeometry->GetArea();
	1214	}
	1215	else
	1216	{
	1217	frontData.mProbability = frontData.mGeometry->GetVolume();
	1218	backData.mProbability = tData.mProbability - frontData.mProbability;
	1219	}
[463]	1220	}
	1221
	1222	//-- create front and back leaf
	1223
	1224	BspInterior *parent = leaf->GetParent();
	1225
	1226	// replace a link from node's parent
	1227	if (!leaf->IsRoot())
	1228	{
	1229	parent->ReplaceChildLink(leaf, interior);
	1230	interior->SetParent(parent);
	1231	}
	1232	else // new root
	1233	{
	1234	mRoot = interior;
	1235	}
	1236
	1237	// and setup child links
	1238	interior->SetupChildLinks(new BspLeaf(interior), new BspLeaf(interior));
	1239
	1240	frontData.mNode = interior->GetFront();
	1241	backData.mNode = interior->GetBack();
	1242
[650]	1243	interior->mTimeStamp = mTimeStamp ++;
	1244
[463]	1245	//DEL_PTR(leaf);
	1246	return interior;
	1247	}
	1248
[582]	1249
[1233]	1250	void BspTree::SortSubdivisionCandidates(const PolygonContainer &polys,
[463]	1251	const int axis,
	1252	vector<SortableEntry> &splitCandidates) const
	1253	{
[480]	1254	splitCandidates.clear();
[463]	1255
[480]	1256	int requestedSize = 2 * (int)polys.size();
	1257	// creates a sorted split candidates array
	1258	splitCandidates.reserve(requestedSize);
[463]	1259
[480]	1260	PolygonContainer::const_iterator it, it_end = polys.end();
	1261
	1262	AxisAlignedBox3 box;
	1263
	1264	// insert all queries
	1265	for(it = polys.begin(); it != it_end; ++ it)
	1266	{
	1267	box.Initialize();
	1268	box.Include((it));
	1269
	1270	splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MIN, box.Min(axis), *it));
	1271	splitCandidates.push_back(SortableEntry(SortableEntry::POLY_MAX, box.Max(axis), *it));
	1272	}
	1273
	1274	stable_sort(splitCandidates.begin(), splitCandidates.end());
[463]	1275	}
	1276
	1277
	1278	float BspTree::BestCostRatio(const PolygonContainer &polys,
	1279	const AxisAlignedBox3 &box,
	1280	const int axis,
	1281	float &position,
	1282	int &objectsBack,
	1283	int &objectsFront) const
	1284	{
	1285	vector<SortableEntry> splitCandidates;
	1286
[1233]	1287	SortSubdivisionCandidates(polys, axis, splitCandidates);
[463]	1288
	1289	// go through the lists, count the number of objects left and right
	1290	// and evaluate the following cost funcion:
	1291	// C = ct_div_ci + (ol + or)/queries
	1292
	1293	int objectsLeft = 0, objectsRight = (int)polys.size();
	1294
	1295	float minBox = box.Min(axis);
	1296	float maxBox = box.Max(axis);
	1297	float boxArea = box.SurfaceArea();
	1298
	1299	float minBand = minBox + mSplitBorder * (maxBox - minBox);
	1300	float maxBand = minBox + (1.0f - mSplitBorder) * (maxBox - minBox);
	1301
	1302	float minSum = 1e20f;
	1303	vector<SortableEntry>::const_iterator ci, ci_end = splitCandidates.end();
	1304
	1305	for(ci = splitCandidates.begin(); ci != ci_end; ++ ci)
	1306	{
	1307	switch ((*ci).type)
	1308	{
	1309	case SortableEntry::POLY_MIN:
	1310	++ objectsLeft;
	1311	break;
	1312	case SortableEntry::POLY_MAX:
	1313	-- objectsRight;
	1314	break;
	1315	default:
	1316	break;
	1317	}
	1318
	1319	if ((ci).value > minBand && (ci).value < maxBand)
	1320	{
	1321	AxisAlignedBox3 lbox = box;
	1322	AxisAlignedBox3 rbox = box;
	1323	lbox.SetMax(axis, (*ci).value);
	1324	rbox.SetMin(axis, (*ci).value);
	1325
[472]	1326	const float sum = objectsLeft * lbox.SurfaceArea() +
	1327	objectsRight * rbox.SurfaceArea();
[463]	1328
	1329	if (sum < minSum)
	1330	{
	1331	minSum = sum;
	1332	position = (*ci).value;
	1333
	1334	objectsBack = objectsLeft;
	1335	objectsFront = objectsRight;
	1336	}
	1337	}
	1338	}
	1339
[472]	1340	const float oldCost = (float)polys.size();
	1341	const float newCost = mAxisAlignedCtDivCi + minSum / boxArea;
	1342	const float ratio = newCost / oldCost;
[463]	1343
[1715]	1344	#ifdef GTP_DEBUG
[463]	1345	Debug << "====================" << endl;
	1346	Debug << "costRatio=" << ratio << " pos=" << position<<" t=" << (position - minBox)/(maxBox - minBox)
	1347	<< "\t o=(" << objectsBack << "," << objectsFront << ")" << endl;
	1348	#endif
	1349	return ratio;
	1350	}
	1351
	1352	bool BspTree::SelectAxisAlignedPlane(Plane3 &plane,
	1353	const PolygonContainer &polys) const
	1354	{
	1355	AxisAlignedBox3 box;
	1356	box.Initialize();
	1357
	1358	// create bounding box of region
[860]	1359	box.Include(polys);
[463]	1360
	1361	int objectsBack = 0, objectsFront = 0;
	1362	int axis = 0;
	1363	float costRatio = MAX_FLOAT;
	1364	Vector3 position;
	1365
	1366	//-- area subdivision
	1367	for (int i = 0; i < 3; ++ i)
	1368	{
	1369	float p = 0;
	1370	float r = BestCostRatio(polys, box, i, p, objectsBack, objectsFront);
	1371
	1372	if (r < costRatio)
	1373	{
	1374	costRatio = r;
	1375	axis = i;
	1376	position = p;
	1377	}
	1378	}
	1379
	1380	if (costRatio >= mMaxCostRatio)
	1381	return false;
	1382
	1383	Vector3 norm(0,0,0); norm[axis] = 1.0f;
	1384	plane = Plane3(norm, position);
	1385
	1386	return true;
	1387	}
	1388
[545]	1389
[463]	1390	Plane3 BspTree::SelectPlane(BspLeaf *leaf, BspTraversalData &data)
	1391	{
[646]	1392	if ((!mMaxPolyCandidates \|\| data.mPolygons->empty()) &&
	1393	(!mMaxRayCandidates \|\| data.mRays->empty()))
[463]	1394	{
	1395	Debug << "Warning: No autopartition polygon candidate available\n";
	1396
	1397	// return axis aligned split
	1398	AxisAlignedBox3 box;
	1399	box.Initialize();
	1400
	1401	// create bounding box of region
[860]	1402	box.Include(*data.mPolygons);
[463]	1403
	1404	const int axis = box.Size().DrivingAxis();
[587]	1405	const Vector3 position = (box.Min()[axis] + box.Max()[axis]) * 0.5f;
[463]	1406
	1407	Vector3 norm(0,0,0); norm[axis] = 1.0f;
	1408	return Plane3(norm, position);
	1409	}
	1410
	1411	if ((mSplitPlaneStrategy & AXIS_ALIGNED) &&
	1412	((int)data.mPolygons->size() > mTermMinPolysForAxisAligned) &&
	1413	((int)data.mRays->size() > mTermMinRaysForAxisAligned) &&
	1414	((mTermMinObjectsForAxisAligned < 0) \|\|
[587]	1415	(Polygon3::ParentObjectsSize(*data.mPolygons) > mTermMinObjectsForAxisAligned)))
[463]	1416	{
	1417	Plane3 plane;
	1418	if (SelectAxisAlignedPlane(plane, *data.mPolygons))
	1419	return plane;
	1420	}
	1421
	1422	// simplest strategy: just take next polygon
	1423	if (mSplitPlaneStrategy & RANDOM_POLYGON)
	1424	{
	1425	if (!data.mPolygons->empty())
	1426	{
[478]	1427	Polygon3 *nextPoly =
	1428	(*data.mPolygons)[(int)RandomValue(0, (Real)((int)data.mPolygons->size() - 1))];
[463]	1429	return nextPoly->GetSupportingPlane();
	1430	}
	1431	else
	1432	{
[475]	1433	const int candidateIdx = (int)RandomValue(0, (Real)((int)data.mRays->size() - 1));
[463]	1434	BoundedRay bRay = (data.mRays)[candidateIdx];
	1435
	1436	Ray *ray = bRay->mRay;
	1437
	1438	const Vector3 minPt = ray->Extrap(bRay->mMinT);
	1439	const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
	1440
	1441	const Vector3 pt = (maxPt + minPt) * 0.5;
	1442
	1443	const Vector3 normal = ray->GetDir();
	1444
	1445	return Plane3(normal, pt);
	1446	}
	1447
	1448	return Plane3();
	1449	}
	1450
	1451	// use heuristics to find appropriate plane
	1452	return SelectPlaneHeuristics(leaf, data);
	1453	}
	1454
[478]	1455
	1456	Plane3 BspTree::ChooseCandidatePlane(const BoundedRayContainer &rays) const
[479]	1457	{
	1458	const int candidateIdx = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1459	BoundedRay *bRay = rays[candidateIdx];
	1460	Ray *ray = bRay->mRay;
[478]	1461
[479]	1462	const Vector3 minPt = ray->Extrap(bRay->mMinT);
	1463	const Vector3 maxPt = ray->Extrap(bRay->mMaxT);
	1464
[478]	1465	const Vector3 pt = (maxPt + minPt) * 0.5;
	1466
[479]	1467	const Vector3 normal = ray->GetDir();
	1468
	1469	return Plane3(normal, pt);
[478]	1470	}
	1471
	1472	Plane3 BspTree::ChooseCandidatePlane2(const BoundedRayContainer &rays) const
[479]	1473	{
	1474	Vector3 pt[3];
[478]	1475	int idx[3];
	1476	int cmaxT = 0;
	1477	int cminT = 0;
	1478	bool chooseMin = false;
	1479
[479]	1480	for (int j = 0; j < 3; j ++)
[478]	1481	{
[479]	1482	idx[j] = (int)RandomValue(0, Real((int)rays.size() * 2 - 1));
	1483
[478]	1484	if (idx[j] >= (int)rays.size())
	1485	{
[479]	1486	idx[j] -= (int)rays.size();
[478]	1487	chooseMin = (cminT < 2);
	1488	}
	1489	else
	1490	chooseMin = (cmaxT < 2);
	1491
[479]	1492	BoundedRay *bRay = rays[idx[j]];
	1493	pt[j] = chooseMin ? bRay->mRay->Extrap(bRay->mMinT) :
	1494	bRay->mRay->Extrap(bRay->mMaxT);
[478]	1495	}
[479]	1496
	1497	return Plane3(pt[0], pt[1], pt[2]);
[478]	1498	}
	1499
[1545]	1500
[478]	1501	Plane3 BspTree::ChooseCandidatePlane3(const BoundedRayContainer &rays) const
[479]	1502	{
[478]	1503	Vector3 pt[3];
	1504
	1505	int idx1 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1506	int idx2 = (int)RandomValue(0, (Real)((int)rays.size() - 1));
	1507
	1508	// check if rays different
	1509	if (idx1 == idx2)
	1510	idx2 = (idx2 + 1) % (int)rays.size();
	1511
[479]	1512	const BoundedRay *ray1 = rays[idx1];
	1513	const BoundedRay *ray2 = rays[idx2];
[478]	1514
	1515	// normal vector of the plane parallel to both lines
[479]	1516	const Vector3 norm =
	1517	Normalize(CrossProd(ray1->mRay->GetDir(), ray2->mRay->GetDir()));
[478]	1518
[479]	1519	const Vector3 orig1 = ray1->mRay->Extrap(ray1->mMinT);
	1520	const Vector3 orig2 = ray2->mRay->Extrap(ray2->mMinT);
	1521
[478]	1522	// vector from line 1 to line 2
[479]	1523	const Vector3 vd = orig1 - orig2;
[478]	1524
	1525	// project vector on normal to get distance
	1526	const float dist = DotProd(vd, norm);
	1527
	1528	// point on plane lies halfway between the two planes
[479]	1529	const Vector3 planePt = orig1 + norm * dist * 0.5;
[478]	1530
[479]	1531	return Plane3(norm, planePt);
[478]	1532	}
	1533
	1534
[463]	1535	Plane3 BspTree::SelectPlaneHeuristics(BspLeaf *leaf, BspTraversalData &data)
	1536	{
	1537	float lowestCost = MAX_FLOAT;
	1538	Plane3 bestPlane;
[478]	1539	// intermediate plane
[463]	1540	Plane3 plane;
	1541
[478]	1542	const int limit = Min((int)data.mPolygons->size(), mMaxPolyCandidates);
	1543	int maxIdx = (int)data.mPolygons->size();
[463]	1544
	1545	for (int i = 0; i < limit; ++ i)
	1546	{
[478]	1547	// assure that no index is taken twice
	1548	const int candidateIdx = (int)RandomValue(0, (Real)(-- maxIdx));
[587]	1549
[463]	1550	Polygon3 poly = (data.mPolygons)[candidateIdx];
[478]	1551
	1552	// swap candidate to the end to avoid testing same plane
	1553	std::swap((data.mPolygons)[maxIdx], (data.mPolygons)[candidateIdx]);
	1554	//Polygon3 poly = (data.mPolygons)[(int)RandomValue(0, (int)polys.size() - 1)];
	1555
[463]	1556	// evaluate current candidate
	1557	const float candidateCost =
	1558	SplitPlaneCost(poly->GetSupportingPlane(), data);
	1559
	1560	if (candidateCost < lowestCost)
	1561	{
	1562	bestPlane = poly->GetSupportingPlane();
	1563	lowestCost = candidateCost;
	1564	}
	1565	}
	1566
[495]	1567	//-- choose candidate planes extracted from rays
[478]	1568	for (int i = 0; i < mMaxRayCandidates; ++ i)
[463]	1569	{
[478]	1570	plane = ChooseCandidatePlane3(*data.mRays);
[463]	1571	const float candidateCost = SplitPlaneCost(plane, data);
	1572
	1573	if (candidateCost < lowestCost)
	1574	{
[478]	1575	bestPlane = plane;
[463]	1576	lowestCost = candidateCost;
	1577	}
	1578	}
	1579
[1715]	1580	#ifdef GTP_DEBUG
[463]	1581	Debug << "plane lowest cost: " << lowestCost << endl;
	1582	#endif
[648]	1583
[463]	1584	return bestPlane;
	1585	}
	1586
	1587
	1588	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1589	const PolygonContainer &polys) const
	1590	{
	1591	float val = 0;
	1592
	1593	float sumBalancedPolys = 0;
	1594	float sumSplits = 0;
	1595	float sumPolyArea = 0;
	1596	float sumBalancedViewCells = 0;
	1597	float sumBlockedRays = 0;
	1598	float totalBlockedRays = 0;
	1599	//float totalArea = 0;
	1600	int totalViewCells = 0;
	1601
	1602	// need three unique ids for each type of view cell
	1603	// for balanced view cells criterium
	1604	ViewCell::NewMail();
	1605	const int backId = ViewCell::sMailId;
	1606	ViewCell::NewMail();
	1607	const int frontId = ViewCell::sMailId;
	1608	ViewCell::NewMail();
	1609	const int frontAndBackId = ViewCell::sMailId;
	1610
[644]	1611	bool useRand;
[463]	1612	int limit;
	1613
	1614	// choose test polyongs randomly if over threshold
	1615	if ((int)polys.size() > mMaxTests)
	1616	{
	1617	useRand = true;
	1618	limit = mMaxTests;
	1619	}
	1620	else
	1621	{
	1622	useRand = false;
	1623	limit = (int)polys.size();
	1624	}
	1625
	1626	for (int i = 0; i < limit; ++ i)
	1627	{
[478]	1628	const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
[463]	1629
	1630	Polygon3 *poly = polys[testIdx];
	1631
	1632	const int classification =
	1633	poly->ClassifyPlane(candidatePlane, mEpsilon);
	1634
	1635	if (mSplitPlaneStrategy & BALANCED_POLYS)
	1636	sumBalancedPolys += sBalancedPolysTable[classification];
	1637
	1638	if (mSplitPlaneStrategy & LEAST_SPLITS)
	1639	sumSplits += sLeastPolySplitsTable[classification];
	1640
	1641	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	1642	{
	1643	if (classification == Polygon3::COINCIDENT)
	1644	sumPolyArea += poly->GetArea();
	1645	//totalArea += area;
	1646	}
	1647
	1648	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	1649	{
	1650	const float blockedRays = (float)poly->mPiercingRays.size();
	1651
	1652	if (classification == Polygon3::COINCIDENT)
	1653	sumBlockedRays += blockedRays;
	1654
	1655	totalBlockedRays += blockedRays;
	1656	}
	1657
	1658	// assign view cells to back or front according to classificaion
	1659	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	1660	{
	1661	MeshInstance *viewCell = poly->mParent;
	1662
	1663	// assure that we only count a view cell
	1664	// once for the front and once for the back side of the plane
	1665	if (classification == Polygon3::FRONT_SIDE)
	1666	{
	1667	if ((viewCell->mMailbox != frontId) &&
	1668	(viewCell->mMailbox != frontAndBackId))
	1669	{
	1670	sumBalancedViewCells += 1.0;
	1671
	1672	if (viewCell->mMailbox != backId)
	1673	viewCell->mMailbox = frontId;
	1674	else
	1675	viewCell->mMailbox = frontAndBackId;
	1676
	1677	++ totalViewCells;
	1678	}
	1679	}
	1680	else if (classification == Polygon3::BACK_SIDE)
	1681	{
	1682	if ((viewCell->mMailbox != backId) &&
	1683	(viewCell->mMailbox != frontAndBackId))
	1684	{
	1685	sumBalancedViewCells -= 1.0;
	1686
	1687	if (viewCell->mMailbox != frontId)
	1688	viewCell->mMailbox = backId;
	1689	else
	1690	viewCell->mMailbox = frontAndBackId;
	1691
	1692	++ totalViewCells;
	1693	}
	1694	}
	1695	}
	1696	}
	1697
	1698	const float polysSize = (float)polys.size() + Limits::Small;
	1699
	1700	// all values should be approx. between 0 and 1 so they can be combined
	1701	// and scaled with the factors according to their importance
	1702	if (mSplitPlaneStrategy & BALANCED_POLYS)
	1703	val += mBalancedPolysFactor * fabs(sumBalancedPolys) / polysSize;
	1704
	1705	if (mSplitPlaneStrategy & LEAST_SPLITS)
	1706	val += mLeastSplitsFactor * sumSplits / polysSize;
	1707
	1708	if (mSplitPlaneStrategy & LARGEST_POLY_AREA)
	1709	// HACK: polys.size should be total area so scaling is between 0 and 1
	1710	val += mLargestPolyAreaFactor * (float)polys.size() / sumPolyArea;
	1711
	1712	if (mSplitPlaneStrategy & BLOCKED_RAYS)
	1713	if (totalBlockedRays != 0)
	1714	val += mBlockedRaysFactor * (totalBlockedRays - sumBlockedRays) / totalBlockedRays;
	1715
	1716	if (mSplitPlaneStrategy & BALANCED_VIEW_CELLS)
	1717	val += mBalancedViewCellsFactor * fabs(sumBalancedViewCells) /
	1718	((float)totalViewCells + Limits::Small);
	1719
	1720	return val;
	1721	}
	1722
	1723
	1724	inline void BspTree::GenerateUniqueIdsForPvs()
	1725	{
[1016]	1726	Intersectable::NewMail(); sBackId = Intersectable::sMailId;
	1727	Intersectable::NewMail(); sFrontId = Intersectable::sMailId;
	1728	Intersectable::NewMail(); sFrontAndBackId = Intersectable::sMailId;
[463]	1729	}
	1730
[551]	1731
[463]	1732	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1733	const BoundedRayContainer &rays,
	1734	const int pvs,
[587]	1735	const float probability,
[463]	1736	const BspNodeGeometry &cell) const
	1737	{
	1738	float val = 0;
	1739
	1740	float sumBalancedRays = 0;
	1741	float sumRaySplits = 0;
	1742
	1743	int frontPvs = 0;
	1744	int backPvs = 0;
	1745
	1746	// probability that view point lies in child
	1747	float pOverall = 0;
	1748	float pFront = 0;
	1749	float pBack = 0;
	1750
	1751	const bool pvsUseLen = false;
	1752
[1016]	1753
[463]	1754	if (mSplitPlaneStrategy & PVS)
	1755	{
	1756	// create unique ids for pvs heuristics
	1757	GenerateUniqueIdsForPvs();
	1758
[587]	1759	// construct child geometry with regard to the candidate split plane
[711]	1760	BspNodeGeometry geomFront;
	1761	BspNodeGeometry geomBack;
[587]	1762
[711]	1763	const bool splitSuccessFull =
	1764	cell.SplitGeometry(geomFront,
	1765	geomBack,
	1766	candidatePlane,
[1545]	1767	mBbox,
[711]	1768	mEpsilon);
[587]	1769
	1770	if (mUseAreaForPvs)
[463]	1771	{
[711]	1772	pFront = geomFront.GetArea();
	1773	pBack = geomBack.GetArea();
[587]	1774	}
	1775	else
	1776	{
[711]	1777	pFront = geomFront.GetVolume();
[605]	1778	pBack = pOverall - pFront;
[587]	1779	}
	1780
[711]	1781
	1782	// give penalty to unbalanced split
	1783	if (1 &&
	1784	(!splitSuccessFull \|\| (pFront <= 0) \|\| (pBack <= 0) \|\|
	1785	!geomFront.Valid() \|\| !geomBack.Valid()))
	1786	{
[744]	1787	//Debug << "error f: " << pFront << " b: " << pBack << endl;
[711]	1788	return 99999.9f;
	1789	}
[463]	1790
[587]	1791	pOverall = probability;
[463]	1792	}
	1793
[545]	1794	bool useRand;
[463]	1795	int limit;
	1796
	1797	// choose test polyongs randomly if over threshold
	1798	if ((int)rays.size() > mMaxTests)
	1799	{
	1800	useRand = true;
	1801	limit = mMaxTests;
	1802	}
	1803	else
	1804	{
	1805	useRand = false;
	1806	limit = (int)rays.size();
	1807	}
	1808
	1809	for (int i = 0; i < limit; ++ i)
	1810	{
[475]	1811	const int testIdx = useRand ? (int)RandomValue(0, (Real)(limit - 1)) : i;
[463]	1812
	1813	BoundedRay *bRay = rays[testIdx];
	1814
	1815	Ray *ray = bRay->mRay;
	1816	const float minT = bRay->mMinT;
	1817	const float maxT = bRay->mMaxT;
	1818
	1819	Vector3 entP, extP;
	1820
	1821	const int cf =
	1822	ray->ClassifyPlane(candidatePlane, minT, maxT, entP, extP);
	1823
	1824	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	1825	{
	1826	sumBalancedRays += sBalancedRaysTable[cf];
	1827	}
	1828
	1829	if (mSplitPlaneStrategy & BALANCED_RAYS)
	1830	{
	1831	sumRaySplits += sLeastRaySplitsTable[cf];
	1832	}
	1833
	1834	if (mSplitPlaneStrategy & PVS)
	1835	{
	1836	// in case the ray intersects an object
	1837	// assure that we only count the object
	1838	// once for the front and once for the back side of the plane
	1839
	1840	// add the termination object
	1841	if (!ray->intersections.empty())
	1842	AddObjToPvs(ray->intersections[0].mObject, cf, frontPvs, backPvs);
	1843
	1844	// add the source object
	1845	AddObjToPvs(ray->sourceObject.mObject, cf, frontPvs, backPvs);
	1846	}
	1847	}
	1848
	1849	const float raysSize = (float)rays.size() + Limits::Small;
	1850
	1851	if (mSplitPlaneStrategy & LEAST_RAY_SPLITS)
	1852	val += mLeastRaySplitsFactor * sumRaySplits / raysSize;
	1853
	1854	if (mSplitPlaneStrategy & BALANCED_RAYS)
	1855	val += mBalancedRaysFactor * fabs(sumBalancedRays) / raysSize;
	1856
[711]	1857	const float denom = pOverall * (float)pvs + Limits::Small;
[463]	1858
	1859	if (mSplitPlaneStrategy & PVS)
	1860	{
	1861	val += mPvsFactor * (frontPvs * pFront + (backPvs * pBack)) / denom;
	1862	}
	1863
	1864
[1715]	1865	#ifdef GTP_DEBUG
[463]	1866	Debug << "totalpvs: " << pvs << " ptotal: " << pOverall
	1867	<< " frontpvs: " << frontPvs << " pFront: " << pFront
	1868	<< " backpvs: " << backPvs << " pBack: " << pBack << endl << endl;
	1869	#endif
	1870
	1871	return val;
	1872	}
	1873
	1874	void BspTree::AddObjToPvs(Intersectable *obj,
	1875	const int cf,
	1876	int &frontPvs,
	1877	int &backPvs) const
	1878	{
	1879	if (!obj)
	1880	return;
	1881	// TODO: does this really belong to no pvs?
	1882	//if (cf == Ray::COINCIDENT) return;
	1883
	1884	// object belongs to both PVS
	1885	const bool bothSides = (cf == Ray::FRONT_BACK) \|\|
	1886	(cf == Ray::BACK_FRONT) \|\|
	1887	(cf == Ray::COINCIDENT);
	1888
	1889	if ((cf == Ray::FRONT) \|\| bothSides)
	1890	{
	1891	if ((obj->mMailbox != sFrontId) &&
	1892	(obj->mMailbox != sFrontAndBackId))
	1893	{
	1894	++ frontPvs;
	1895
	1896	if (obj->mMailbox == sBackId)
	1897	obj->mMailbox = sFrontAndBackId;
	1898	else
	1899	obj->mMailbox = sFrontId;
	1900	}
	1901	}
	1902
	1903	if ((cf == Ray::BACK) \|\| bothSides)
	1904	{
	1905	if ((obj->mMailbox != sBackId) &&
	1906	(obj->mMailbox != sFrontAndBackId))
	1907	{
	1908	++ backPvs;
	1909
	1910	if (obj->mMailbox == sFrontId)
	1911	obj->mMailbox = sFrontAndBackId;
	1912	else
	1913	obj->mMailbox = sBackId;
	1914	}
	1915	}
	1916	}
	1917
[644]	1918
[463]	1919	float BspTree::SplitPlaneCost(const Plane3 &candidatePlane,
	1920	BspTraversalData &data) const
	1921	{
	1922	float val = 0;
	1923
	1924	if (mSplitPlaneStrategy & VERTICAL_AXIS)
	1925	{
[1545]	1926	Vector3 tinyAxis(0,0,0); tinyAxis[mBbox.Size().TinyAxis()] = 1.0f;
[463]	1927	// we put a penalty on the dot product between the "tiny" vertical axis
	1928	// and the split plane axis
	1929	val += mVerticalSplitsFactor *
	1930	fabs(DotProd(candidatePlane.mNormal, tinyAxis));
	1931	}
	1932
	1933	// the following criteria loop over all polygons to find the cost value
	1934	if ((mSplitPlaneStrategy & BALANCED_POLYS) \|\|
	1935	(mSplitPlaneStrategy & LEAST_SPLITS) \|\|
	1936	(mSplitPlaneStrategy & LARGEST_POLY_AREA) \|\|
	1937	(mSplitPlaneStrategy & BALANCED_VIEW_CELLS) \|\|
	1938	(mSplitPlaneStrategy & BLOCKED_RAYS))
	1939	{
	1940	val += SplitPlaneCost(candidatePlane, *data.mPolygons);
	1941	}
	1942
	1943	// the following criteria loop over all rays to find the cost value
	1944	if ((mSplitPlaneStrategy & BALANCED_RAYS) \|\|
	1945	(mSplitPlaneStrategy & LEAST_RAY_SPLITS) \|\|
	1946	(mSplitPlaneStrategy & PVS))
	1947	{
	1948	val += SplitPlaneCost(candidatePlane, *data.mRays, data.mPvs,
[587]	1949	data.mProbability, *data.mGeometry);
[463]	1950	}
	1951
	1952	// return linear combination of the sums
	1953	return val;
	1954	}
	1955
	1956	void BspTree::CollectLeaves(vector<BspLeaf *> &leaves) const
	1957	{
	1958	stack<BspNode *> nodeStack;
	1959	nodeStack.push(mRoot);
	1960
	1961	while (!nodeStack.empty())
	1962	{
	1963	BspNode *node = nodeStack.top();
	1964
	1965	nodeStack.pop();
	1966
	1967	if (node->IsLeaf())
	1968	{
	1969	BspLeaf leaf = (BspLeaf )node;
	1970	leaves.push_back(leaf);
	1971	}
	1972	else
	1973	{
[2017]	1974	BspInterior interior = static_cast<BspInterior >(node);
[463]	1975
	1976	nodeStack.push(interior->GetBack());
	1977	nodeStack.push(interior->GetFront());
	1978	}
	1979	}
	1980	}
	1981
[487]	1982
[463]	1983	AxisAlignedBox3 BspTree::GetBoundingBox() const
	1984	{
[1545]	1985	return mBbox;
[463]	1986	}
	1987
[487]	1988
[463]	1989	void BspTree::EvaluateLeafStats(const BspTraversalData &data)
	1990	{
	1991	// the node became a leaf -> evaluate stats for leafs
[2017]	1992	BspLeaf leaf = static_cast<BspLeaf >(data.mNode);
[463]	1993
	1994	// store maximal and minimal depth
	1995	if (data.mDepth > mStat.maxDepth)
	1996	mStat.maxDepth = data.mDepth;
	1997
	1998	if (data.mDepth < mStat.minDepth)
	1999	mStat.minDepth = data.mDepth;
	2000
	2001	// accumulate depth to compute average depth
	2002	mStat.accumDepth += data.mDepth;
[503]	2003	// accumulate rays to compute rays / leaf
	2004	mStat.accumRays += (int)data.mRays->size();
[463]	2005
	2006	if (data.mDepth >= mTermMaxDepth)
	2007	++ mStat.maxDepthNodes;
	2008
	2009	if (data.mPvs < mTermMinPvs)
	2010	++ mStat.minPvsNodes;
	2011
	2012	if ((int)data.mRays->size() < mTermMinRays)
	2013	++ mStat.minRaysNodes;
	2014
	2015	if (data.GetAvgRayContribution() > mTermMaxRayContribution)
	2016	++ mStat.maxRayContribNodes;
	2017
[587]	2018	if (data.mProbability <= mTermMinProbability)
[547]	2019	++ mStat.minProbabilityNodes;
[463]	2020
[1715]	2021	#ifdef GTP_DEBUG
[463]	2022	Debug << "BSP stats: "
	2023	<< "Depth: " << data.mDepth << " (max: " << mTermMaxDepth << "), "
	2024	<< "PVS: " << data.mPvs << " (min: " << mTermMinPvs << "), "
[587]	2025	<< "Probability: " << data.mProbability << " (min: " << mTermMinProbability << "), "
[463]	2026	<< "#polygons: " << (int)data.mPolygons->size() << " (max: " << mTermMinPolys << "), "
	2027	<< "#rays: " << (int)data.mRays->size() << " (max: " << mTermMinRays << "), "
[1707]	2028	<< "#pvs: " << leaf->GetViewCell()->GetPvs().EvalPvsCost() << "=, "
[463]	2029	<< "#avg ray contrib (pvs): " << (float)data.mPvs / (float)data.mRays->size() << endl;
	2030	#endif
	2031	}
	2032
[711]	2033
	2034	int BspTree::_CastRay(Ray &ray)
[463]	2035	{
	2036	int hits = 0;
	2037
	2038	stack<BspRayTraversalData> tStack;
	2039
	2040	float maxt, mint;
	2041
[1545]	2042	if (!mBbox.GetRaySegment(ray, mint, maxt))
[463]	2043	return 0;
	2044
[611]	2045	ViewCell::NewMail();
[463]	2046
	2047	Vector3 entp = ray.Extrap(mint);
	2048	Vector3 extp = ray.Extrap(maxt);
	2049
	2050	BspNode *node = mRoot;
	2051	BspNode *farChild = NULL;
	2052
	2053	while (1)
	2054	{
	2055	if (!node->IsLeaf())
	2056	{
[2017]	2057	BspInterior in = static_cast<BspInterior >(node);
[463]	2058
	2059	Plane3 splitPlane = in->GetPlane();
	2060	const int entSide = splitPlane.Side(entp);
	2061	const int extSide = splitPlane.Side(extp);
	2062
	2063	if (entSide < 0)
	2064	{
	2065	node = in->GetBack();
	2066
	2067	if(extSide <= 0) // plane does not split ray => no far child
	2068	continue;
	2069
	2070	farChild = in->GetFront(); // plane splits ray
	2071
	2072	} else if (entSide > 0)
	2073	{
	2074	node = in->GetFront();
	2075
	2076	if (extSide >= 0) // plane does not split ray => no far child
	2077	continue;
	2078
	2079	farChild = in->GetBack(); // plane splits ray
	2080	}
	2081	else // ray and plane are coincident
	2082	{
	2083	// WHAT TO DO IN THIS CASE ?
	2084	//break;
	2085	node = in->GetFront();
	2086	continue;
	2087	}
	2088
	2089	// push data for far child
	2090	tStack.push(BspRayTraversalData(farChild, extp, maxt));
	2091
	2092	// find intersection of ray segment with plane
	2093	float t;
	2094	extp = splitPlane.FindIntersection(ray.GetLoc(), extp, &t);
	2095	maxt *= t;
	2096
	2097	} else // reached leaf => intersection with view cell
	2098	{
[2017]	2099	BspLeaf leaf = static_cast<BspLeaf >(node);
[463]	2100
	2101	if (!leaf->mViewCell->Mailed())
	2102	{
[645]	2103	//ray.bspIntersections.push_back(Ray::BspIntersection(maxt, leaf));
[463]	2104	leaf->mViewCell->Mail();
	2105	++ hits;
	2106	}
	2107
	2108	//-- fetch the next far child from the stack
	2109	if (tStack.empty())
	2110	break;
	2111
	2112	entp = extp;
	2113	mint = maxt; // NOTE: need this?
	2114
	2115	if (ray.GetType() == Ray::LINE_SEGMENT && mint > 1.0f)
	2116	break;
	2117
	2118	BspRayTraversalData &s = tStack.top();
	2119
	2120	node = s.mNode;
	2121	extp = s.mExitPoint;
	2122	maxt = s.mMaxT;
	2123
	2124	tStack.pop();
	2125	}
	2126	}
	2127
	2128	return hits;
	2129	}
	2130
[466]	2131
[468]	2132	int BspTree::CastLineSegment(const Vector3 &origin,
	2133	const Vector3 &termination,
[882]	2134	ViewCellContainer &viewcells)
[466]	2135	{
[483]	2136	int hits = 0;
	2137	stack<BspRayTraversalData> tStack;
	2138
[873]	2139	float mint = 0.0f, maxt = 1.0f;
[483]	2140
[1291]	2141	//ViewCell::NewMail();
[483]	2142
	2143	Vector3 entp = origin;
	2144	Vector3 extp = termination;
	2145
	2146	BspNode *node = mRoot;
	2147	BspNode *farChild = NULL;
	2148
[719]	2149
[666]	2150	const float thresh = 1 ? 1e-6f : 0.0f;
	2151
[483]	2152	while (1)
	2153	{
	2154	if (!node->IsLeaf())
	2155	{
[2017]	2156	BspInterior in = static_cast<BspInterior >(node);
[719]	2157
[483]	2158	Plane3 splitPlane = in->GetPlane();
	2159
[666]	2160	const int entSide = splitPlane.Side(entp, thresh);
	2161	const int extSide = splitPlane.Side(extp, thresh);
[483]	2162
	2163	if (entSide < 0)
	2164	{
	2165	node = in->GetBack();
[719]	2166
	2167	// plane does not split ray => no far child
	2168	if (extSide <= 0)
[483]	2169	continue;
[719]	2170
[483]	2171	farChild = in->GetFront(); // plane splits ray
	2172	}
[719]	2173	else if (entSide > 0)
[483]	2174	{
	2175	node = in->GetFront();
[719]	2176
[483]	2177	if (extSide >= 0) // plane does not split ray => no far child
	2178	continue;
[719]	2179
	2180	farChild = in->GetBack(); // plane splits ray
[483]	2181	}
[719]	2182	else // one of the ray end points is on the plane
	2183	{ // NOTE: what to do if ray is coincident with plane?
[645]	2184	if (extSide < 0)
	2185	node = in->GetBack();
[694]	2186	else //if (extSide > 0)
[645]	2187	node = in->GetFront();
[719]	2188	//else break; // coincident => count no intersections
[694]	2189
[645]	2190	continue; // no far child
[483]	2191	}
[719]	2192
[483]	2193	// push data for far child
	2194	tStack.push(BspRayTraversalData(farChild, extp, maxt));
	2195
	2196	// find intersection of ray segment with plane
	2197	float t;
	2198	extp = splitPlane.FindIntersection(origin, extp, &t);
	2199	maxt *= t;
	2200	}
	2201	else
	2202	{
	2203	// reached leaf => intersection with view cell
[2017]	2204	BspLeaf leaf = static_cast<BspLeaf >(node);
[483]	2205
	2206	if (!leaf->mViewCell->Mailed())
	2207	{
	2208	viewcells.push_back(leaf->mViewCell);
	2209	leaf->mViewCell->Mail();
[1291]	2210	++ hits;
[483]	2211	}
	2212
	2213	//-- fetch the next far child from the stack
	2214	if (tStack.empty())
	2215	break;
	2216
	2217	entp = extp;
	2218	mint = maxt; // NOTE: need this?
	2219
	2220	BspRayTraversalData &s = tStack.top();
	2221
	2222	node = s.mNode;
	2223	extp = s.mExitPoint;
	2224	maxt = s.mMaxT;
	2225
	2226	tStack.pop();
[466]	2227	}
	2228	}
[719]	2229
[483]	2230	return hits;
[466]	2231	}
	2232
[463]	2233
	2234	void BspTree::CollectViewCells(ViewCellContainer &viewCells) const
	2235	{
	2236	stack<BspNode *> nodeStack;
	2237	nodeStack.push(mRoot);
	2238
	2239	ViewCell::NewMail();
	2240
	2241	while (!nodeStack.empty())
	2242	{
	2243	BspNode *node = nodeStack.top();
	2244	nodeStack.pop();
	2245
	2246	if (node->IsLeaf())
	2247	{
[2017]	2248	ViewCellLeaf viewCell = static_cast<BspLeaf >(node)->mViewCell;
[463]	2249
	2250	if (!viewCell->Mailed())
	2251	{
	2252	viewCell->Mail();
	2253	viewCells.push_back(viewCell);
	2254	}
	2255	}
	2256	else
	2257	{
[2017]	2258	BspInterior interior = static_cast<BspInterior >(node);
[463]	2259
	2260	nodeStack.push(interior->GetFront());
	2261	nodeStack.push(interior->GetBack());
	2262	}
	2263	}
	2264	}
	2265
	2266
	2267	BspTreeStatistics &BspTree::GetStat()
	2268	{
	2269	return mStat;
	2270	}
	2271
[479]	2272
[463]	2273	float BspTree::AccumulatedRayLength(BoundedRayContainer &rays) const
	2274	{
	2275	float len = 0;
	2276
	2277	BoundedRayContainer::const_iterator it, it_end = rays.end();
	2278
	2279	for (it = rays.begin(); it != it_end; ++ it)
	2280	{
	2281	len += SqrDistance((it)->mRay->Extrap((it)->mMinT),
	2282	(it)->mRay->Extrap((it)->mMaxT));
	2283	}
	2284
	2285	return len;
	2286	}
	2287
[479]	2288
[463]	2289	int BspTree::SplitRays(const Plane3 &plane,
	2290	BoundedRayContainer &rays,
	2291	BoundedRayContainer &frontRays,
	2292	BoundedRayContainer &backRays)
	2293	{
	2294	int splits = 0;
[473]	2295
[463]	2296	while (!rays.empty())
	2297	{
	2298	BoundedRay *bRay = rays.back();
	2299	Ray *ray = bRay->mRay;
	2300	float minT = bRay->mMinT;
	2301	float maxT = bRay->mMaxT;
	2302
	2303	rays.pop_back();
	2304
	2305	Vector3 entP, extP;
	2306
	2307	const int cf =
	2308	ray->ClassifyPlane(plane, minT, maxT, entP, extP);
	2309
	2310	// set id to ray classification
	2311	ray->SetId(cf);
	2312
	2313	switch (cf)
	2314	{
	2315	case Ray::COINCIDENT: // TODO: should really discard ray?
	2316	frontRays.push_back(bRay);
	2317	break;
	2318	case Ray::BACK:
	2319	backRays.push_back(bRay);
	2320	break;
	2321	case Ray::FRONT:
	2322	frontRays.push_back(bRay);
	2323	break;
	2324	case Ray::FRONT_BACK:
	2325	{
	2326	// find intersection of ray segment with plane
	2327	const float t = plane.FindT(ray->GetLoc(), extP);
	2328
	2329	const float newT = t * maxT;
	2330
	2331	frontRays.push_back(new BoundedRay(ray, minT, newT));
	2332	backRays.push_back(new BoundedRay(ray, newT, maxT));
	2333
	2334	DEL_PTR(bRay);
	2335	}
	2336	break;
	2337	case Ray::BACK_FRONT:
	2338	{
	2339	// find intersection of ray segment with plane
	2340	const float t = plane.FindT(ray->GetLoc(), extP);
	2341	const float newT = t * bRay->mMaxT;
	2342
	2343	backRays.push_back(new BoundedRay(ray, minT, newT));
	2344	frontRays.push_back(new BoundedRay(ray, newT, maxT));
	2345
	2346	DEL_PTR(bRay);
	2347
	2348	++ splits;
	2349	}
	2350	break;
	2351	default:
	2352	Debug << "Should not come here 4" << endl;
	2353	break;
	2354	}
	2355	}
	2356
	2357	return splits;
	2358	}
	2359
	2360	void BspTree::ExtractHalfSpaces(BspNode *n, vector<Plane3> &halfSpaces) const
	2361	{
	2362	BspNode *lastNode;
[678]	2363
[463]	2364	do
	2365	{
	2366	lastNode = n;
	2367
	2368	// want to get planes defining geometry of this node => don't take
	2369	// split plane of node itself
	2370	n = n->GetParent();
[719]	2371
[463]	2372	if (n)
	2373	{
[2017]	2374	BspInterior interior = static_cast<BspInterior >(n);
	2375	Plane3 halfSpace = static_cast<BspInterior *>(interior)->GetPlane();
[463]	2376
[683]	2377	if (interior->GetBack() != lastNode)
[463]	2378	halfSpace.ReverseOrientation();
	2379
	2380	halfSpaces.push_back(halfSpace);
	2381	}
	2382	}
	2383	while (n);
	2384	}
	2385
	2386
[587]	2387	void BspTree::ConstructGeometry(ViewCell *vc,
	2388	BspNodeGeometry &vcGeom) const
[589]	2389	{
[1545]	2390	// if false, cannot construct geometry for interior leaf
	2391	if (!mViewCellsTree)
	2392	return;
	2393
[587]	2394	ViewCellContainer leaves;
[600]	2395	mViewCellsTree->CollectLeaves(vc, leaves);
[587]	2396
	2397	ViewCellContainer::const_iterator it, it_end = leaves.end();
	2398
[463]	2399	for (it = leaves.begin(); it != it_end; ++ it)
[587]	2400	{
[1557]	2401	// per definition out of bounds cell has zero volume
[1563]	2402	if (IsOutOfBounds(*it))
[1557]	2403	continue;
	2404
[2017]	2405	BspViewCell bspVc = static_cast<BspViewCell >(*it);
[1551]	2406	vector<BspLeaf *>::const_iterator bit, bit_end = bspVc->mLeaves.end();
	2407
	2408	for (bit = bspVc->mLeaves.begin(); bit != bit_end; ++ bit)
	2409	{
	2410	BspLeaf l = bit;
	2411	ConstructGeometry(l, vcGeom);
	2412	}
[587]	2413	}
[463]	2414	}
	2415
	2416
[683]	2417	void BspTree::ConstructGeometry(BspNode *n,
	2418	BspNodeGeometry &geom) const
[587]	2419	{
[463]	2420	vector<Plane3> halfSpaces;
	2421	ExtractHalfSpaces(n, halfSpaces);
	2422
[683]	2423	PolygonContainer candidatePolys;
[678]	2424	vector<Plane3> candidatePlanes;
[463]	2425
[719]	2426	vector<Plane3>::const_iterator pit, pit_end = halfSpaces.end();
	2427
[683]	2428	// bounded planes are added to the polygons
[719]	2429	for (pit = halfSpaces.begin(); pit != pit_end; ++ pit)
[463]	2430	{
[719]	2431	Polygon3 p = GetBoundingBox().CrossSection(pit);
[683]	2432
[463]	2433	if (p->Valid(mEpsilon))
	2434	{
[683]	2435	candidatePolys.push_back(p);
[719]	2436	candidatePlanes.push_back(*pit);
[463]	2437	}
	2438	}
	2439
	2440	// add faces of bounding box (also could be faces of the cell)
	2441	for (int i = 0; i < 6; ++ i)
	2442	{
	2443	VertexContainer vertices;
[683]	2444
[463]	2445	for (int j = 0; j < 4; ++ j)
[1545]	2446	vertices.push_back(mBbox.GetFace(i).mVertices[j]);
[463]	2447
[678]	2448	Polygon3 *poly = new Polygon3(vertices);
[683]	2449
	2450	candidatePolys.push_back(poly);
[678]	2451	candidatePlanes.push_back(poly->GetSupportingPlane());
[463]	2452	}
	2453
[683]	2454	for (int i = 0; i < (int)candidatePolys.size(); ++ i)
[463]	2455	{
	2456	// polygon is split by all other planes
[683]	2457	for (int j = 0; (j < (int)halfSpaces.size()) && candidatePolys[i]; ++ j)
[463]	2458	{
	2459	if (i == j) // polygon and plane are coincident
	2460	continue;
	2461
	2462	VertexContainer splitPts;
	2463	Polygon3 frontPoly, backPoly;
	2464
[683]	2465	const int cf =
	2466	candidatePolys[i]->ClassifyPlane(halfSpaces[j],
	2467	mEpsilon);
	2468
[463]	2469	switch (cf)
	2470	{
	2471	case Polygon3::SPLIT:
	2472	frontPoly = new Polygon3();
	2473	backPoly = new Polygon3();
	2474
[683]	2475	candidatePolys[i]->Split(halfSpaces[j],
	2476	*frontPoly,
	2477	*backPoly,
	2478	mEpsilon);
[463]	2479
[683]	2480	DEL_PTR(candidatePolys[i]);
[463]	2481
[719]	2482	if (backPoly->Valid(mEpsilon))
	2483	candidatePolys[i] = backPoly;
[463]	2484	else
[719]	2485	DEL_PTR(backPoly);
[463]	2486
[719]	2487	// outside, don't need this
	2488	DEL_PTR(frontPoly);
[463]	2489	break;
[683]	2490	// polygon outside of halfspace
	2491	case Polygon3::FRONT_SIDE:
	2492	DEL_PTR(candidatePolys[i]);
[463]	2493	break;
	2494	// just take polygon as it is
[683]	2495	case Polygon3::BACK_SIDE:
[463]	2496	case Polygon3::COINCIDENT:
	2497	default:
	2498	break;
	2499	}
	2500	}
[683]	2501
	2502	if (candidatePolys[i])
[678]	2503	{
[683]	2504	geom.Add(candidatePolys[i], candidatePlanes[i]);
[678]	2505	}
[463]	2506	}
	2507	}
	2508
	2509
[683]	2510	void BspTree::SetViewCellsManager(ViewCellsManager *vcm)
	2511	{
	2512	mViewCellsManager = vcm;
	2513	}
	2514
	2515
[587]	2516	typedef pair<BspNode , BspNodeGeometry > bspNodePair;
	2517
	2518
[726]	2519	int BspTree::FindNeighbors(BspNode *n,
	2520	vector<BspLeaf *> &neighbors,
[463]	2521	const bool onlyUnmailed) const
	2522	{
[587]	2523	stack<bspNodePair> nodeStack;
	2524
	2525	BspNodeGeometry nodeGeom;
	2526	ConstructGeometry(n, nodeGeom);
	2527
	2528	// split planes from the root to this node
	2529	// needed to verify that we found neighbor leaf
	2530	// TODO: really needed?
[463]	2531	vector<Plane3> halfSpaces;
	2532	ExtractHalfSpaces(n, halfSpaces);
	2533
[587]	2534
	2535	BspNodeGeometry *rgeom = new BspNodeGeometry();
	2536	ConstructGeometry(mRoot, *rgeom);
	2537
	2538	nodeStack.push(bspNodePair(mRoot, rgeom));
	2539
	2540	while (!nodeStack.empty())
[463]	2541	{
[587]	2542	BspNode *node = nodeStack.top().first;
	2543	BspNodeGeometry *geom = nodeStack.top().second;
	2544
[463]	2545	nodeStack.pop();
	2546
	2547	if (node->IsLeaf())
	2548	{
[587]	2549	// test if this leaf is in valid view space
	2550	if (node->TreeValid() &&
	2551	(node != n) &&
	2552	(!onlyUnmailed \|\| !node->Mailed()))
[463]	2553	{
	2554	bool isAdjacent = true;
[587]	2555
	2556	if (1)
[463]	2557	{
[587]	2558	// test all planes of current node if still adjacent
	2559	for (int i = 0; (i < halfSpaces.size()) && isAdjacent; ++ i)
	2560	{
	2561	const int cf =
[678]	2562	Polygon3::ClassifyPlane(geom->GetPolys(),
[587]	2563	halfSpaces[i],
	2564	mEpsilon);
[463]	2565
[683]	2566	if (cf == Polygon3::FRONT_SIDE)
[587]	2567	{
	2568	isAdjacent = false;
	2569	}
	2570	}
[463]	2571	}
[587]	2572	else
	2573	{
	2574	// TODO: why is this wrong??
	2575	// test all planes of current node if still adjacent
[678]	2576	for (int i = 0; (i < nodeGeom.Size()) && isAdjacent; ++ i)
[587]	2577	{
[678]	2578	Polygon3 *poly = nodeGeom.GetPolys()[i];
[463]	2579
[587]	2580	const int cf =
[678]	2581	Polygon3::ClassifyPlane(geom->GetPolys(),
[587]	2582	poly->GetSupportingPlane(),
	2583	mEpsilon);
	2584
[683]	2585	if (cf == Polygon3::FRONT_SIDE)
[587]	2586	{
	2587	isAdjacent = false;
	2588	}
	2589	}
	2590	}
	2591	// neighbor was found
[463]	2592	if (isAdjacent)
[587]	2593	{
[2017]	2594	neighbors.push_back(static_cast<BspLeaf *>(node));
[587]	2595	}
[463]	2596	}
	2597	}
[587]	2598	else
[463]	2599	{
[2017]	2600	BspInterior interior = static_cast<BspInterior >(node);
[587]	2601
[678]	2602	const int cf = Polygon3::ClassifyPlane(nodeGeom.GetPolys(),
[587]	2603	interior->GetPlane(),
[463]	2604	mEpsilon);
[587]	2605
	2606	BspNode *front = interior->GetFront();
	2607	BspNode *back = interior->GetBack();
	2608
	2609	BspNodeGeometry *fGeom = new BspNodeGeometry();
	2610	BspNodeGeometry *bGeom = new BspNodeGeometry();
[463]	2611
[587]	2612	geom->SplitGeometry(*fGeom,
	2613	*bGeom,
	2614	interior->GetPlane(),
[1545]	2615	mBbox,
[683]	2616	//0.0000001f);
[587]	2617	mEpsilon);
	2618
[683]	2619	if (cf == Polygon3::BACK_SIDE)
[587]	2620	{
[683]	2621	nodeStack.push(bspNodePair(interior->GetBack(), bGeom));
	2622	DEL_PTR(fGeom);
[587]	2623	}
[463]	2624	else
[587]	2625	{
[683]	2626	if (cf == Polygon3::FRONT_SIDE)
[463]	2627	{
[683]	2628	nodeStack.push(bspNodePair(interior->GetFront(), fGeom));
	2629	DEL_PTR(bGeom);
[463]	2630	}
[587]	2631	else
	2632	{ // random decision
	2633	nodeStack.push(bspNodePair(front, fGeom));
	2634	nodeStack.push(bspNodePair(back, bGeom));
	2635	}
	2636	}
[463]	2637	}
[587]	2638
	2639	DEL_PTR(geom);
[463]	2640	}
[587]	2641
[463]	2642	return (int)neighbors.size();
	2643	}
	2644
[503]	2645
[463]	2646	BspLeaf *BspTree::GetRandomLeaf(const bool onlyUnmailed)
	2647	{
	2648	stack<BspNode *> nodeStack;
	2649
	2650	nodeStack.push(mRoot);
	2651
	2652	int mask = rand();
	2653
	2654	while (!nodeStack.empty())
	2655	{
	2656	BspNode *node = nodeStack.top();
	2657	nodeStack.pop();
	2658
	2659	if (node->IsLeaf())
	2660	{
	2661	if ( (!onlyUnmailed \|\| !node->Mailed()) )
[2017]	2662	return static_cast<BspLeaf *>(node);
[463]	2663	}
	2664	else
	2665	{
[2017]	2666	BspInterior interior = static_cast<BspInterior >(node);
[463]	2667
	2668	// random decision
	2669	if (mask & 1)
	2670	nodeStack.push(interior->GetBack());
	2671	else
	2672	nodeStack.push(interior->GetFront());
	2673
	2674	mask = mask >> 1;
	2675	}
	2676	}
	2677
	2678	return NULL;
	2679	}
	2680
[587]	2681
[463]	2682	void BspTree::AddToPvs(BspLeaf *leaf,
	2683	const BoundedRayContainer &rays,
	2684	int &sampleContributions,
	2685	int &contributingSamples)
	2686	{
	2687	sampleContributions = 0;
	2688	contributingSamples = 0;
	2689
	2690	BoundedRayContainer::const_iterator it, it_end = rays.end();
	2691
[882]	2692	ViewCellLeaf *vc = leaf->GetViewCell();
[463]	2693
	2694	// add contributions from samples to the PVS
	2695	for (it = rays.begin(); it != it_end; ++ it)
	2696	{
[1790]	2697	float contribution = 0;
[463]	2698	Ray ray = (it)->mRay;
[1828]	2699	//float relContribution;
[463]	2700	if (!ray->intersections.empty())
[556]	2701	contribution += vc->GetPvs().AddSample(ray->intersections[0].mObject,
[1789]	2702	1.0f);
	2703	//relContribution);
[463]	2704
	2705	if (ray->sourceObject.mObject)
[556]	2706	contribution += vc->GetPvs().AddSample(ray->sourceObject.mObject,
[1789]	2707	1.0f);
	2708	//relContribution);
[556]	2709
[1790]	2710	if (contribution > 0)
[463]	2711	{
[1790]	2712	sampleContributions += (int)contribution;
[463]	2713	++ contributingSamples;
	2714	}
	2715
	2716	//if (ray->mFlags & Ray::STORE_BSP_INTERSECTIONS)
	2717	// ray->bspIntersections.push_back(Ray::BspIntersection((*it)->mMinT, this));
	2718	}
	2719	}
	2720
[587]	2721
[463]	2722	int BspTree::ComputePvsSize(const BoundedRayContainer &rays) const
	2723	{
	2724	int pvsSize = 0;
	2725
	2726	BoundedRayContainer::const_iterator rit, rit_end = rays.end();
	2727
	2728	Intersectable::NewMail();
	2729
	2730	for (rit = rays.begin(); rit != rays.end(); ++ rit)
	2731	{
	2732	Ray ray = (rit)->mRay;
	2733
	2734	if (!ray->intersections.empty())
	2735	{
	2736	if (!ray->intersections[0].mObject->Mailed())
	2737	{
	2738	ray->intersections[0].mObject->Mail();
	2739	++ pvsSize;
	2740	}
	2741	}
	2742	if (ray->sourceObject.mObject)
	2743	{
	2744	if (!ray->sourceObject.mObject->Mailed())
	2745	{
	2746	ray->sourceObject.mObject->Mail();
	2747	++ pvsSize;
	2748	}
	2749	}
	2750	}
	2751
	2752	return pvsSize;
	2753	}
	2754
[587]	2755
[463]	2756	float BspTree::GetEpsilon() const
	2757	{
	2758	return mEpsilon;
	2759	}
	2760
	2761
[587]	2762	int BspTree::CollectMergeCandidates(const vector<BspLeaf *> leaves,
	2763	vector<MergeCandidate> &candidates)
	2764	{
	2765	BspLeaf::NewMail();
	2766
	2767	vector<BspLeaf *>::const_iterator it, it_end = leaves.end();
[463]	2768
[587]	2769	int numCandidates = 0;
[503]	2770
[587]	2771	// find merge candidates and push them into queue
	2772	for (it = leaves.begin(); it != it_end; ++ it)
	2773	{
	2774	BspLeaf leaf = it;
	2775
	2776	// the same leaves must not be part of two merge candidates
	2777	leaf->Mail();
	2778	vector<BspLeaf *> neighbors;
	2779	FindNeighbors(leaf, neighbors, true);
	2780
	2781	vector<BspLeaf *>::const_iterator nit, nit_end = neighbors.end();
	2782
	2783	// TODO: test if at least one ray goes from one leaf to the other
	2784	for (nit = neighbors.begin(); nit != nit_end; ++ nit)
	2785	{
	2786	if ((*nit)->GetViewCell() != leaf->GetViewCell())
	2787	{
	2788	MergeCandidate mc(leaf->GetViewCell(), (*nit)->GetViewCell());
	2789	candidates.push_back(mc);
	2790
	2791	++ numCandidates;
	2792	if ((numCandidates % 1000) == 0)
	2793	{
	2794	cout << "collected " << numCandidates << " merge candidates" << endl;
	2795	}
	2796	}
	2797	}
	2798	}
	2799
	2800	Debug << "merge queue: " << (int)candidates.size() << endl;
	2801	Debug << "leaves in queue: " << numCandidates << endl;
	2802
	2803
	2804	return (int)leaves.size();
	2805	}
	2806
	2807
	2808	int BspTree::CollectMergeCandidates(const VssRayContainer &rays,
	2809	vector<MergeCandidate> &candidates)
	2810	{
	2811	ViewCell::NewMail();
	2812	long startTime = GetTime();
	2813
	2814	map<BspLeaf , vector<BspLeaf> > neighborMap;
	2815	ViewCellContainer::const_iterator iit;
	2816
	2817	int numLeaves = 0;
	2818
	2819	BspLeaf::NewMail();
	2820
	2821	for (int i = 0; i < (int)rays.size(); ++ i)
	2822	{
	2823	VssRay *ray = rays[i];
[2609]	2824	#if VSS_STORE_VIEWCELLS
[587]	2825
	2826	// traverse leaves stored in the rays and compare and
	2827	// merge consecutive leaves (i.e., the neighbors in the tree)
	2828	if (ray->mViewCells.size() < 2)
	2829	continue;
[590]	2830
[587]	2831	iit = ray->mViewCells.begin();
[2017]	2832	BspViewCell bspVc = static_cast<BspViewCell >(*(iit ++));
[1551]	2833	BspLeaf *leaf = bspVc->mLeaves[0];
[587]	2834
	2835	// traverse intersections
	2836	// consecutive leaves are neighbors => add them to queue
	2837	for (; iit != ray->mViewCells.end(); ++ iit)
	2838	{
	2839	// next pair
	2840	BspLeaf *prevLeaf = leaf;
[2017]	2841	bspVc = static_cast<BspViewCell >(iit);
[1551]	2842	leaf = bspVc->mLeaves[0];
[587]	2843
	2844	// view space not valid or same view cell
	2845	if (!leaf->TreeValid() \|\| !prevLeaf->TreeValid() \|\|
	2846	(leaf->GetViewCell() == prevLeaf->GetViewCell()))
	2847	continue;
	2848
	2849	vector<BspLeaf *> &neighbors = neighborMap[leaf];
	2850
	2851	bool found = false;
	2852
	2853	// both leaves inserted in queue already =>
	2854	// look if double pair already exists
	2855	if (leaf->Mailed() && prevLeaf->Mailed())
	2856	{
	2857	vector<BspLeaf *>::const_iterator it, it_end = neighbors.end();
	2858
	2859	for (it = neighbors.begin(); !found && (it != it_end); ++ it)
	2860	if (*it == prevLeaf)
	2861	found = true; // already in queue
	2862	}
	2863
	2864	if (!found)
	2865	{
	2866	// this pair is not in map yet
	2867	// => insert into the neighbor map and the queue
	2868	neighbors.push_back(prevLeaf);
	2869	neighborMap[prevLeaf].push_back(leaf);
	2870
	2871	leaf->Mail();
	2872	prevLeaf->Mail();
	2873
	2874	MergeCandidate mc(leaf->GetViewCell(), prevLeaf->GetViewCell());
	2875
	2876	candidates.push_back(mc);
	2877
[2609]	2878	if ((candidates.size() % 1000) == 0)
[587]	2879	{
	2880	cout << "collected " << (int)candidates.size() << " merge candidates" << endl;
	2881	}
	2882	}
	2883	}
[2609]	2884	#endif
[587]	2885	}
	2886
	2887	Debug << "neighbormap size: " << (int)neighborMap.size() << endl;
	2888	Debug << "merge queue: " << (int)candidates.size() << endl;
	2889	Debug << "leaves in queue: " << numLeaves << endl;
	2890
[1545]	2891	#if 0
	2892	//////////
[587]	2893	//-- collect the leaves which haven't been found by ray casting
	2894	cout << "finding additional merge candidates using geometry" << endl;
	2895	vector<BspLeaf *> leaves;
	2896	CollectLeaves(leaves, true);
	2897	Debug << "found " << (int)leaves.size() << " new leaves" << endl << endl;
	2898	CollectMergeCandidates(leaves, candidates);
	2899	#endif
	2900
	2901	return numLeaves;
	2902	}
	2903
	2904
	2905
	2906	/***************************************************************/
	2907	/* BspNodeGeometry Implementation */
	2908	/***************************************************************/
	2909
	2910
[508]	2911	BspNodeGeometry::BspNodeGeometry(const BspNodeGeometry &rhs)
	2912	{
[574]	2913	mPolys.reserve(rhs.mPolys.size());
[710]	2914	mPlanes.reserve(rhs.mPolys.size());
	2915
[508]	2916	PolygonContainer::const_iterator it, it_end = rhs.mPolys.end();
[678]	2917
	2918	int i = 0;
	2919
[710]	2920	for (it = rhs.mPolys.begin(); it != it_end; ++ it, ++i)
[508]	2921	{
	2922	Polygon3 poly = it;
[710]	2923	Add(new Polygon3(*poly), rhs.mPlanes[i]);
[508]	2924	}
	2925	}
	2926
[574]	2927
[710]	2928	BspNodeGeometry& BspNodeGeometry::operator=(const BspNodeGeometry& g)
	2929	{
	2930	if (this == &g)
	2931	return *this;
	2932
	2933	CLEAR_CONTAINER(mPolys);
	2934
	2935	mPolys.reserve(g.mPolys.size());
	2936	mPlanes.reserve(g.mPolys.size());
	2937
	2938	PolygonContainer::const_iterator it, it_end = g.mPolys.end();
	2939
	2940	int i = 0;
	2941
	2942	for (it = g.mPolys.begin(); it != it_end; ++ it, ++ i)
	2943	{
	2944	Polygon3 poly = it;
	2945	Add(new Polygon3(*poly), g.mPlanes[i]);
	2946	}
	2947
	2948	return *this;
	2949	}
	2950
	2951
	2952	BspNodeGeometry::BspNodeGeometry(const PolygonContainer &polys)
	2953	{
	2954	mPolys = polys;
	2955	mPlanes.reserve(polys.size());
	2956
	2957	PolygonContainer::const_iterator it, it_end = polys.end();
	2958
	2959	for (it = polys.begin(); it != it_end; ++ it)
	2960	{
	2961	Polygon3 poly = it;
	2962	mPlanes.push_back(poly->GetSupportingPlane());
	2963	}
	2964	}
	2965
	2966
[463]	2967	BspNodeGeometry::~BspNodeGeometry()
	2968	{
	2969	CLEAR_CONTAINER(mPolys);
	2970	}
	2971
[503]	2972
[678]	2973	int BspNodeGeometry::Size() const
	2974	{
	2975	return (int)mPolys.size();
	2976	}
	2977
	2978
	2979	const PolygonContainer &BspNodeGeometry::GetPolys()
	2980	{
	2981	return mPolys;
	2982	}
	2983
	2984
	2985	void BspNodeGeometry::Add(Polygon3 *p, const Plane3 &plane)
	2986	{
	2987	mPolys.push_back(p);
	2988	mPlanes.push_back(plane);
	2989	}
	2990
	2991
[463]	2992	float BspNodeGeometry::GetArea() const
	2993	{
	2994	return Polygon3::GetArea(mPolys);
	2995	}
	2996
[503]	2997
[544]	2998	float BspNodeGeometry::GetVolume() const
	2999	{
	3000	//-- compute volume using tetrahedralization of the geometry
	3001	// and adding the volume of the single tetrahedrons
	3002	float volume = 0;
	3003	const float f = 1.0f / 6.0f;
	3004
	3005	PolygonContainer::const_iterator pit, pit_end = mPolys.end();
	3006
[545]	3007	// note: can take arbitrary point, e.g., the origin. However,
[587]	3008	// we rather take the center of mass to prevents precision errors
[545]	3009	const Vector3 center = CenterOfMass();
	3010
[544]	3011	for (pit = mPolys.begin(); pit != pit_end; ++ pit)
	3012	{
	3013	Polygon3 poly = pit;
[545]	3014	const Vector3 v0 = poly->mVertices[0] - center;
[544]	3015
	3016	for (int i = 1; i < (int)poly->mVertices.size() - 1; ++ i)
	3017	{
[545]	3018	const Vector3 v1 = poly->mVertices[i] - center;
	3019	const Vector3 v2 = poly->mVertices[i + 1] - center;
	3020
[678]	3021	// more robust version using abs and the center of mass
	3022	volume += fabs (f * (DotProd(v0, CrossProd(v1, v2))));
[544]	3023	}
	3024	}
	3025
	3026	return volume;
	3027	}
	3028
	3029
[697]	3030	void BspNodeGeometry::GetBoundingBox(AxisAlignedBox3 &box) const
	3031	{
	3032	box.Initialize();
[860]	3033	box.Include(mPolys);
[697]	3034	}
	3035
	3036
[710]	3037	int BspNodeGeometry::Side(const Plane3 &plane, const float eps) const
[697]	3038	{
	3039	PolygonContainer::const_iterator it, it_end = mPolys.end();
	3040
	3041	bool onFrontSide = false;
	3042	bool onBackSide = false;
	3043
	3044	for (it = mPolys.begin(); it != it_end; ++ it)
	3045	{
[710]	3046	const int side = (*it)->Side(plane, eps);
[697]	3047
	3048	if (side == -1)
	3049	onBackSide = true;
	3050	else if (side == 1)
	3051	onFrontSide = true;
	3052
	3053	if ((side == 0) \|\| (onBackSide && onFrontSide))
	3054	return 0;
	3055	}
	3056
	3057	if (onFrontSide)
	3058	return 1;
	3059
	3060	return -1;
	3061	}
	3062
	3063
	3064	int BspNodeGeometry::ComputeIntersection(const AxisAlignedBox3 &box) const
	3065	{
[704]	3066	// 1: box does not intersect geometry
	3067	// 0: box intersects geometry
	3068	// -1: box contains geometry
	3069
[697]	3070	AxisAlignedBox3 boundingBox;
	3071	GetBoundingBox(boundingBox);
	3072
	3073	// no intersections with bounding box
[704]	3074	if (!Overlap(box, boundingBox))
[697]	3075	{
	3076	return 1;
	3077	}
	3078
[704]	3079	// box cotains bounding box of geometry >=> contains geometry
	3080	if (box.Includes(boundingBox))
	3081	return -1;
	3082
	3083	int result = 0;
	3084
	3085	// test geometry planes for intersections
	3086	vector<Plane3>::const_iterator it, it_end = mPlanes.end();
	3087
	3088	for (it = mPlanes.begin(); it != it_end; ++ it)
[697]	3089	{
[704]	3090	const int side = box.Side(*it);
[697]	3091
	3092	// box does not intersects geometry
	3093	if (side == 1)
[704]	3094	{
[697]	3095	return 1;
[704]	3096	}
	3097	//if (side == 0) result = 0;
[697]	3098	}
	3099
	3100	return result;
	3101	}
	3102
	3103
[545]	3104	Vector3 BspNodeGeometry::CenterOfMass() const
[544]	3105	{
	3106	int n = 0;
	3107
	3108	Vector3 center(0,0,0);
	3109
	3110	PolygonContainer::const_iterator pit, pit_end = mPolys.end();
	3111
	3112	for (pit = mPolys.begin(); pit != pit_end; ++ pit)
	3113	{
	3114	Polygon3 poly = pit;
	3115
	3116	VertexContainer::const_iterator vit, vit_end = poly->mVertices.end();
	3117
	3118	for(vit = poly->mVertices.begin(); vit != vit_end; ++ vit)
	3119	{
	3120	center += *vit;
	3121	++ n;
	3122	}
	3123	}
	3124
[679]	3125	//Debug << "center: " << center << " new " << center / (float)n << endl;
	3126
[544]	3127	return center / (float)n;
	3128	}
	3129
	3130
[678]	3131	bool BspNodeGeometry::Valid() const
	3132	{
[1545]	3133	// geometry is degenerated
[678]	3134	if (mPolys.size() < 4)
	3135	return false;
	3136
	3137	return true;
	3138	}
	3139
[840]	3140	void IncludeNodeGeomInMesh(const BspNodeGeometry &geom, Mesh &mesh)
[503]	3141	{
[840]	3142	// add single polygons to mesh
	3143	PolygonContainer::const_iterator it, it_end = geom.mPolys.end();
[508]	3144
[840]	3145	for (it = geom.mPolys.begin(); it != geom.mPolys.end(); ++ it)
[503]	3146	{
[840]	3147	Polygon3 poly = (it);
	3148	IncludePolyInMesh(*poly, mesh);
[503]	3149	}
	3150	}
	3151
	3152
[679]	3153	bool BspNodeGeometry::SplitGeometry(BspNodeGeometry &front,
[463]	3154	BspNodeGeometry &back,
	3155	const Plane3 &splitPlane,
	3156	const AxisAlignedBox3 &box,
	3157	const float epsilon) const
	3158	{
[711]	3159	//-- trivial cases
	3160	if (0)
	3161	{
	3162	const int cf = Side(splitPlane, epsilon);
[710]	3163
[711]	3164	if (cf == -1)
	3165	{
	3166	back = *this;
	3167	return false;
	3168	}
	3169	else if (cf == 1)
	3170	{
	3171	front = *this;
	3172	return false;
	3173	}
[710]	3174	}
	3175
[463]	3176	// get cross section of new polygon
	3177	Polygon3 *planePoly = box.CrossSection(splitPlane);
[710]	3178
[463]	3179	// split polygon with all other polygons
	3180	planePoly = SplitPolygon(planePoly, epsilon);
	3181
[682]	3182	bool splitsGeom = (planePoly != NULL);
[681]	3183
[463]	3184	//-- new polygon splits all other polygons
[679]	3185	for (int i = 0; i < (int)mPolys.size()/* && planePoly*/; ++ i)
[463]	3186	{
	3187	/// don't use epsilon here to get exact split planes
	3188	const int cf =
[676]	3189	mPolys[i]->ClassifyPlane(splitPlane, epsilon);
[463]	3190
	3191	switch (cf)
	3192	{
	3193	case Polygon3::SPLIT:
	3194	{
	3195	Polygon3 *poly = new Polygon3(mPolys[i]->mVertices);
	3196
	3197	Polygon3 *frontPoly = new Polygon3();
	3198	Polygon3 *backPoly = new Polygon3();
	3199
	3200	poly->Split(splitPlane,
	3201	*frontPoly,
	3202	*backPoly,
	3203	epsilon);
	3204
	3205	DEL_PTR(poly);
	3206
	3207	if (frontPoly->Valid(epsilon))
[678]	3208	{
	3209	front.Add(frontPoly, mPlanes[i]);
	3210	}
[463]	3211	else
[678]	3212	{
[681]	3213	//Debug << "no f! " << endl;
[463]	3214	DEL_PTR(frontPoly);
[678]	3215	}
[679]	3216
[463]	3217	if (backPoly->Valid(epsilon))
[678]	3218	{
	3219	back.Add(backPoly, mPlanes[i]);
	3220	}
[463]	3221	else
[678]	3222	{
[681]	3223	//Debug << "no b! " << endl;
[463]	3224	DEL_PTR(backPoly);
[678]	3225	}
[463]	3226	}
	3227
	3228	break;
	3229	case Polygon3::BACK_SIDE:
[678]	3230	back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3231	break;
	3232	case Polygon3::FRONT_SIDE:
[678]	3233	front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3234	break;
[678]	3235	// only put into back container (split should have no effect ...)
[463]	3236	case Polygon3::COINCIDENT:
[684]	3237	//Debug << "error should not come here" << endl;
[681]	3238	splitsGeom = false;
[678]	3239
[683]	3240	if (DotProd(mPlanes[i].mNormal, splitPlane.mNormal > 0))
[681]	3241	back.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
	3242	else
	3243	front.Add(new Polygon3(mPolys[i]->mVertices), mPlanes[i]);
[463]	3244	break;
	3245	default:
	3246	break;
	3247	}
	3248	}
	3249
	3250	//-- finally add the new polygon to the child node geometries
	3251	if (planePoly)
	3252	{
[683]	3253	// add polygon with reverse orientation to front cell
[682]	3254	Plane3 reversePlane(splitPlane);
	3255	reversePlane.ReverseOrientation();
	3256
[463]	3257	// add polygon with normal pointing into positive half space to back cell
[678]	3258	back.Add(planePoly, splitPlane);
	3259	//back.mPolys.push_back(planePoly);
[683]	3260
[682]	3261	Polygon3 *reversePoly = planePoly->CreateReversePolygon();
	3262	front.Add(reversePoly, reversePlane);
[684]	3263	//Debug << "poly normal : " << reversePoly->GetSupportingPlane().mNormal << " split plane normal " << reversePlane.mNormal << endl;
[463]	3264	}
[684]	3265
[679]	3266
[681]	3267	return splitsGeom;
[463]	3268	}
	3269
[574]	3270
[463]	3271	Polygon3 BspNodeGeometry::SplitPolygon(Polygon3 planePoly,
	3272	const float epsilon) const
	3273	{
	3274	if (!planePoly->Valid(epsilon))
[683]	3275	{
[684]	3276	//Debug << "not valid!!" << endl;
[463]	3277	DEL_PTR(planePoly);
[683]	3278	}
[463]	3279	// polygon is split by all other planes
	3280	for (int i = 0; (i < (int)mPolys.size()) && planePoly; ++ i)
	3281	{
[683]	3282	//Plane3 plane = mPolys[i]->GetSupportingPlane();
[678]	3283	Plane3 plane = mPlanes[i];
[683]	3284
[463]	3285	/// don't use epsilon here to get exact split planes
	3286	const int cf =
[678]	3287	planePoly->ClassifyPlane(plane, epsilon);
[463]	3288
	3289	// split new polygon with all previous planes
	3290	switch (cf)
	3291	{
	3292	case Polygon3::SPLIT:
	3293	{
	3294	Polygon3 *frontPoly = new Polygon3();
	3295	Polygon3 *backPoly = new Polygon3();
	3296
	3297	planePoly->Split(plane,
	3298	*frontPoly,
	3299	*backPoly,
	3300	epsilon);
	3301
	3302	// don't need anymore
	3303	DEL_PTR(planePoly);
	3304	DEL_PTR(frontPoly);
	3305
	3306	// back polygon is belonging to geometry
	3307	if (backPoly->Valid(epsilon))
	3308	planePoly = backPoly;
	3309	else
	3310	DEL_PTR(backPoly);
	3311	}
	3312	break;
	3313	case Polygon3::FRONT_SIDE:
	3314	DEL_PTR(planePoly);
	3315	break;
	3316	// polygon is taken as it is
	3317	case Polygon3::BACK_SIDE:
	3318	case Polygon3::COINCIDENT:
	3319	default:
	3320	break;
	3321	}
	3322	}
	3323
	3324	return planePoly;
	3325	}
[480]	3326
[492]	3327
[679]	3328	ViewCell *BspTree::GetViewCell(const Vector3 &point)
[492]	3329	{
[1563]	3330	if (mRoot == NULL)
	3331	return NULL;
[502]	3332
[1563]	3333	stack<BspNode *> nodeStack;
	3334	nodeStack.push(mRoot);
	3335
	3336	ViewCellLeaf *viewcell = NULL;
	3337
	3338	while (!nodeStack.empty()) {
	3339	BspNode *node = nodeStack.top();
	3340	nodeStack.pop();
	3341
	3342	if (node->IsLeaf())
	3343	{
[2017]	3344	viewcell = static_cast<BspLeaf *>(node)->mViewCell;
[1563]	3345	break;
	3346	}
	3347	else
	3348	{
	3349
[2017]	3350	BspInterior interior = static_cast<BspInterior >(node);
[1563]	3351
	3352	// random decision
	3353	if (interior->GetPlane().Side(point) < 0)
	3354	{
	3355	nodeStack.push(interior->GetBack());
	3356	}
	3357	else
	3358	{
	3359	nodeStack.push(interior->GetFront());
	3360	}
	3361	}
[492]	3362	}
[1563]	3363
	3364	return viewcell;
[492]	3365	}
	3366
[590]	3367
[1551]	3368	bool BspTree::Export(OUT_STREAM &stream)
[590]	3369	{
	3370	ExportNode(mRoot, stream);
	3371	return true;
	3372	}
	3373
	3374
[1551]	3375	void BspTree::ExportNode(BspNode *node, OUT_STREAM &stream)
[590]	3376	{
	3377	if (node->IsLeaf())
	3378	{
[2017]	3379	BspLeaf leaf = static_cast<BspLeaf >(node);
[1551]	3380	ViewCell *viewCell = mViewCellsTree->GetActiveViewCell(leaf->GetViewCell());
[590]	3381
[1551]	3382	const int id = viewCell->GetId();
	3383
[590]	3384	stream << "<Leaf viewCellId=\"" << id << "\" />" << endl;
	3385	}
	3386	else
	3387	{
[2017]	3388	BspInterior interior = static_cast<BspInterior >(node);
[590]	3389
	3390	Plane3 plane = interior->GetPlane();
	3391	stream << "<Interior plane=\"" << plane.mNormal.x << " "
	3392	<< plane.mNormal.y << " " << plane.mNormal.z << " "
	3393	<< plane.mD << "\">" << endl;
	3394
	3395	ExportNode(interior->GetBack(), stream);
	3396	ExportNode(interior->GetFront(), stream);
	3397
	3398	stream << "</Interior>" << endl;
	3399	}
	3400	}
[860]	3401
[1551]	3402
[1545]	3403	}

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source: GTP/trunk/Lib/Vis/Preprocessing/src/ViewCellBsp.cpp @ 2609

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