source: GTP/trunk/Lib/Vis/Preprocessing/src/VssPreprocessor.cpp @ 1528

#include "SceneGraph.h"
#include "KdTree.h"
#include "VssPreprocessor.h"
#include "X3dExporter.h"
#include "Environment.h"
#include "MutualVisibility.h"
#include "Polygon3.h"
#include "ViewCell.h"
#include "VssRay.h"
#include "VssTree.h"
#include "ViewCellsManager.h"
#include "RenderSimulator.h"
#include "Beam.h"
#include "GlRenderer.h"
#include "Intersectable.h"
#include "RayCaster.h"


namespace GtpVisibilityPreprocessor {

bool use2dSampling = false;
bool useViewspacePlane = false;

VssPreprocessor::VssPreprocessor():
  mVssRays()
{
  // this should increase coherence of the samples
  Environment::GetSingleton()->GetIntValue("VssPreprocessor.samplesPerPass", mSamplesPerPass);
  Environment::GetSingleton()->GetIntValue("VssPreprocessor.initialSamples", mInitialSamples);
  Environment::GetSingleton()->GetIntValue("VssPreprocessor.vssSamples", mVssSamples);
  Environment::GetSingleton()->GetIntValue("VssPreprocessor.vssSamplesPerPass", mVssSamplesPerPass);
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.useImportanceSampling", mUseImportanceSampling);
 
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.loadInitialSamples", mLoadInitialSamples);
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.storeInitialSamples", mStoreInitialSamples);
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.useViewSpaceBox", mUseViewSpaceBox);
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.testBeamSampling", mTestBeamSampling);
  Environment::GetSingleton()->GetBoolValue("VssPreprocessor.enlargeViewSpace", mEnlargeViewSpace);
  Environment::GetSingleton()->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
  
  useViewspacePlane = mUseViewSpaceBox; //hack

  mViewSpaceBox.Initialize();
  
  Debug << "*********** vss preprocessor options **************" << endl;
  Debug << "use view space box=" << mUseViewSpaceBox << endl;
  Debug << "enlarge view space=" << mEnlargeViewSpace << endl;
  Debug << "*********** end vss preprocessor options **************" << endl;

  mStats.open("stats.log");
}


VssPreprocessor::~VssPreprocessor()
{
        CLEAR_CONTAINER(mVssRays);
}


Vector3
VssPreprocessor::GetViewpoint(AxisAlignedBox3 *viewSpaceBox)
{
  AxisAlignedBox3 box;

  if (viewSpaceBox)
        box =*viewSpaceBox;
  else
        box = mKdTree->GetBox();

  // shrink the box in the y direction
  return box.GetRandomPoint();
}

Vector3
VssPreprocessor::GetDirection(const Vector3 &viewpoint,
                                                          AxisAlignedBox3 *viewSpaceBox
                                                          )
{
  Vector3 point;
  if (!use2dSampling) 
  {
          if (0) 
          {
                  Vector3 normal;
                  int i = Random((int)mObjects.size());
                  Intersectable *object = mObjects[i];
                  object->GetRandomSurfacePoint(point, normal);
          } 
          else
                  point = mKdTree->GetBox().GetRandomPoint();
        //        point = viewpoint + UniformRandomVector();
  } 
  else 
  {
          AxisAlignedBox3 box;

          if (viewSpaceBox)
                  box =*viewSpaceBox;
          else
                  box = mKdTree->GetBox();

          point = box.GetRandomPoint();
          point.y = viewpoint.y;
  }

  return point - viewpoint;
}

int
VssPreprocessor::GenerateImportanceRays(VssTree *vssTree,
                                                                                const int desiredSamples,
                                                                                SimpleRayContainer &rays
                                                                                )
{
  int num;
  if (0) {
        float minRayContribution;
        float maxRayContribution;
        float avgRayContribution;

        vssTree->GetRayContributionStatistics(minRayContribution,
                                                                                  maxRayContribution,
                                                                                  avgRayContribution);

        cout<<
          "#MIN_RAY_CONTRIB\n"<<minRayContribution<<endl<<
          "#MAX_RAY_CONTRIB\n"<<maxRayContribution<<endl<<
          "#AVG_RAY_CONTRIB\n"<<avgRayContribution<<endl;

        float p = desiredSamples/(float)(avgRayContribution*vssTree->stat.Leaves());
        num = vssTree->GenerateRays(p, rays);
  } else {
        int leaves = vssTree->stat.Leaves();
        num = vssTree->GenerateRays(desiredSamples, leaves, rays);
  }

  cout<<"Generated "<<num<<" rays."<<endl;

  return num;
}


bool
VssPreprocessor::ExportRays(const char *filename,
                                                        const VssRayContainer &vssRays,
                                                        const int number
                                                        )
{
  cout<<"Exporting vss rays..."<<endl<<flush;

  Exporter *exporter = NULL;
  exporter = Exporter::GetExporter(filename);
  exporter->SetWireframe();
  exporter->ExportKdTree(*mKdTree);
  exporter->SetFilled();
  exporter->ExportScene(mSceneGraph->GetRoot());
  exporter->SetWireframe();

  exporter->SetForcedMaterial(RgbColor(1,0,1));
  exporter->ExportBox(mViewSpaceBox);
  exporter->ResetForcedMaterial();


  VssRayContainer rays;
  vssRays.SelectRays(number, rays);
  
  //exporter->ExportRays(rays, RgbColor(1, 0, 0));

  delete exporter;

  cout<<"done."<<endl<<flush;

  return true;
}


bool
VssPreprocessor::ExportVssTree(char *filename,
                                                           VssTree *tree,
                                                           const Vector3 &dir
                                                           )
{
  Exporter *exporter = Exporter::GetExporter(filename);
  exporter->SetFilled();
  exporter->ExportScene(mSceneGraph->GetRoot());
  //  exporter->SetWireframe();
  bool result = exporter->ExportVssTree2( *tree, dir );
  delete exporter;
  return result;
}

bool
VssPreprocessor::ExportVssTreeLeaf(char *filename,
                                                                   VssTree *tree,
                                                                   VssTreeLeaf *leaf)
{
  Exporter *exporter = NULL;
  exporter = Exporter::GetExporter(filename);
  exporter->SetWireframe();
  exporter->ExportKdTree(*mKdTree);

  exporter->SetForcedMaterial(RgbColor(1,0,0));
  exporter->ExportBox(mViewSpaceBox);
  exporter->ResetForcedMaterial();

  exporter->SetForcedMaterial(RgbColor(0,0,1));
  exporter->ExportBox(tree->GetBBox(leaf));
  exporter->ResetForcedMaterial();

  VssRayContainer rays[4];
  for (int i=0; i < leaf->rays.size(); i++) {
        int k = leaf->rays[i].GetRayClass();
        rays[k].push_back(leaf->rays[i].mRay);
  }

  // SOURCE RAY
  exporter->ExportRays(rays[0], RgbColor(1, 0, 0));
  // TERMINATION RAY
  exporter->ExportRays(rays[1], RgbColor(1, 1, 1));
  // PASSING_RAY
  exporter->ExportRays(rays[2], RgbColor(1, 1, 0));
  // CONTAINED_RAY
  exporter->ExportRays(rays[3], RgbColor(0, 0, 1));

  delete exporter;
  return true;
}

void
VssPreprocessor::ExportVssTreeLeaves(VssTree *tree, const int number)
{
  vector<VssTreeLeaf *> leaves;
  tree->CollectLeaves(leaves);

  int num = 0;
  int i;
  float p = number / (float)leaves.size();
  for (i=0; i < leaves.size(); i++) {
        if (RandomValue(0,1) < p) {
          char filename[64];
          sprintf(filename, "vss-leaf-%04d.x3d", num);
          ExportVssTreeLeaf(filename, tree, leaves[i]);
          num++;
        }
        if (num >= number)
          break;
  }
}


void VssPreprocessor::TestBeamCasting(VssTree *tree, 
                                                                          ViewCellsManager *vm, 
                                                                          const ObjectContainer &objects)
{
        //debuggerWidget = new GlDebuggerWidget(renderer);
        //  renderer->resize(640, 480);
        //debuggerWidget->resize(640, 480);

        vector<VssTreeLeaf *> leaves;
        tree->CollectLeaves(leaves);

        Exporter *exporter = Exporter::GetExporter("shafts.x3d");

        exporter->SetWireframe();
        exporter->ExportGeometry(objects);
        exporter->SetFilled();
        //Randomize();
// §§matt
//      debuggerWidget = new GlDebuggerWidget(renderer);

        /*debuggerWidget->mBeam = beam;
        debuggerWidget->mSourceObject = sourceObj;
        debuggerWidget->mSamples = 10000;
        
        Debug << "showing window" << endl;
        debuggerWidget->show();
        
        renderer->makeCurrent();*/

        for (int i = 0; i < 10; ++ i)
        {
                Beam beam;
                Intersectable *sourceObj = mObjects[5];

                const int index = (int)RandomValue(0, (Real)((int)leaves.size() - 1));
                VssTreeLeaf *leaf = leaves[index];

                AxisAlignedBox3 dirBox = tree->GetDirBBox(leaf);
                AxisAlignedBox3 box = tree->GetBBox(leaf);
                
                beam.Construct(box, dirBox);

                // collect kd leaves and view cells
                mKdTree->CastBeam(beam);
                vm->CastBeam(beam);

                Debug << "found " << (int)beam.mViewCells.size() << " view cells and " 
                          << (int)beam.mKdNodes.size() << " kd nodes" << endl;

                BeamSampleStatistics stats;
// §§matt
/*              renderer->SampleBeamContributions(sourceObj,
                                                                                  beam,
                                                                                  200000,
                                                                                  stats);

                char s[64]; sprintf(s, "shaft%04d.png", i);

                QImage image = renderer->toImage();
                image.save(s, "PNG");
                Debug << "beam statistics: " << stats << endl << endl;
*/
                if (1)
                {
                        AxisAlignedBox3 sbox = mSceneGraph->GetBox();
                        Vector3 bmin = sbox.Min() - 150.0f;
                        Vector3 bmax = sbox.Max() + 150.0f;
                        AxisAlignedBox3 vbox(bmin, bmax);
                
                        exporter->ExportBeam(beam, vbox);
                }

                bool exportViewCells = false;
                if (exportViewCells)
                {
                        ViewCellContainer::const_iterator it, it_end = beam.mViewCells.end();
                        
                        for (it = beam.mViewCells.begin(); it != beam.mViewCells.end(); ++ it)
                        {
                                BspNodeGeometry geom;
                                AxisAlignedBox3 vbox;
                                vbox.Initialize();
                                vbox.Include((*it)->GetMesh());
                        
                                exporter->SetWireframe();
                                exporter->ExportBox(vbox);
                                exporter->SetFilled();
                                exporter->ExportViewCell(*it);
                        }

                        /*vector<KdNode *>::const_iterator it, it_end = beam.mKdNodes.end();
                        
                        for (it = beam.mKdNodes.begin(); it != beam.mKdNodes.end(); ++ it)
                        {
                                exporter->ExportBox(mKdTree->GetBox((*it)));
                        }*/
                }
        }
        /*while (1)
        { debuggerWidget->repaint();
        };*/
        delete exporter;
}


float
VssPreprocessor::GetAvgPvsSize(VssTree *tree,
                                                           const vector<AxisAlignedBox3> &viewcells
                                                           )
{
  vector<AxisAlignedBox3>::const_iterator it, it_end = viewcells.end();

  int sum = 0;
  for (it = viewcells.begin(); it != it_end; ++ it)
        sum += tree->GetPvsSize(*it);

  return sum/(float)viewcells.size();
}

bool
VssPreprocessor::ComputeVisibility()
{
        Debug << "type: vss" << endl;

  long startTime = GetTime();

  int totalSamples = 0;


  AxisAlignedBox3 box(mKdTree->GetBox());
  
  if (!useViewspacePlane) {
        float size = 0.05f;
        float s = 0.5f - size;
        float olds = Magnitude(box.Size());
        box.Enlarge(box.Size()*Vector3(-s));
        Vector3 translation = Vector3(-olds*0.1f, 0, 0);
        box.SetMin(box.Min() + translation);
        box.SetMax(box.Max() + translation);
  } else {

        // sample city like heights
        box.SetMin(1, box.Min(1) + box.Size(1)*0.2f);
        box.SetMax(1, box.Min(1) + box.Size(1)*0.3f);
  }

  if (use2dSampling)
        box.SetMax(1, box.Min(1));

  cout << "use view space box=" << mUseViewSpaceBox << endl;

  
  if (mUseViewSpaceBox)
  {
          if (!mEnlargeViewSpace)
          {
                  mViewSpaceBox = AxisAlignedBox3(box);
          }
          else
          {
                  mViewSpaceBox = AxisAlignedBox3(mKdTree->GetBox());

                  if (0) 
                  {
                          // HACK: enlarge in y directon
                          Vector3 size = mViewSpaceBox.Size();
                        
                          size[1] *= 1.25;
                          Vector3 enlarge(size[0] * 0.25f, size[1] * 0.0f, size[2] * 0.25f);
                          //Vector3 enlarge(size[0] * 4.0f, 0.0f, 0.0f);

                          mViewSpaceBox.Enlarge(enlarge);
                          mViewSpaceBox.SetMax(mViewSpaceBox.Max() + enlarge);
                  } 
                  else 
                  {
                          AxisAlignedBox3 tbox(mViewSpaceBox);

                          Vector3 size = mViewSpaceBox.Size();
                          tbox.SetMax(0, mViewSpaceBox.Max(0) + size[0] * 0.5f);
                          tbox.SetMin(0, mViewSpaceBox.Min(0) + size[0]);
                          mViewSpaceBox = tbox;
                  }             
          }
  }
  else
  {
          mViewSpaceBox = AxisAlignedBox3(mKdTree->GetBox());
  }
  
  mSceneGraph->CollectObjects(&mObjects);

  if (!mLoadViewCells)
  {
          //-- generate new view cells from the scratch
          //-- for construction the manager uses it's own set of samples
          ConstructViewCells(mViewSpaceBox);
  }
#if 0
  else 
  {      
          //-- load view cells from file
          //-- test successful view cells loading by exporting them again
      VssRayContainer dummies;
          mViewCellsManager->Visualize(mObjects, dummies);
          mViewCellsManager->ExportViewCells("test.xml.zip", mViewCellsManager->GetExportPvs(), mObjects);
  }
#endif

  VssTree *vssTree = NULL; 
  const long initialTime = GetTime();

  if (mLoadInitialSamples)
  {
          cout << "Loading samples from file ... ";
          LoadSamples(mVssRays, mObjects);
          cout << "finished\n" << endl;
          totalSamples = (int)mVssRays.size();
  }
  else
  {
        while (totalSamples < mInitialSamples) {
                int passContributingSamples = 0;
                int passSampleContributions = 0;
                int passSamples = 0;

                int index = 0;

                int sampleContributions;

                int s = Min(mSamplesPerPass, mInitialSamples);
                for (int k=0; k < s; k++) 
                {
                        Vector3 viewpoint; 
                
                        mViewCellsManager->GetViewPoint(viewpoint);
                        const Vector3 direction = GetDirection(viewpoint, &mViewSpaceBox);

                        const SimpleRay sray(viewpoint, direction);
                        sampleContributions = mRayCaster->CastRay(sray, mVssRays, mViewSpaceBox, true);

                        if (sampleContributions) {
                                passContributingSamples ++;
                                passSampleContributions += sampleContributions;
                        }
                        passSamples++;
                        totalSamples++;
                }

                mPass++;
                int pvsSize = 0;
                float avgRayContrib = (passContributingSamples > 0) ?
                        passSampleContributions/(float)passContributingSamples : 0;

                cout << "#Pass " << mPass << " : t = " << TimeDiff(startTime, GetTime())*1e-3 << "s" << endl;
                cout << "#TotalSamples=" << totalSamples/1000
                        << "#SampleContributions=" << passSampleContributions << " ("
                        << 100*passContributingSamples/(float)passSamples<<"%)" << " avgPVS="
                        << pvsSize/(float)mObjects.size() << endl
                        << "avg ray contrib=" << avgRayContrib << endl;

                mStats <<
                        "#Pass\n" <<mPass<<endl<<
                        "#Time\n" << TimeDiff(startTime, GetTime())*1e-3 << endl<<
                        "#TotalSamples\n" << totalSamples<< endl<<
                        "#SampleContributions\n" << passSampleContributions << endl <<
                        "#PContributingSamples\n"<<100*passContributingSamples/(float)passSamples<<endl <<
                        "#AvgPVS\n"<< pvsSize/(float)mObjects.size() << endl <<
                        "#AvgRayContrib\n" << avgRayContrib << endl;
          }
 
          cout << "#totalPvsSize=" << mKdTree->CollectLeafPvs() << endl;


          
  }
 

  cout << "#totalRayStackSize=" << (int)mVssRays.size() << endl << flush;
  Debug << (int)mVssRays.size() << " rays generated in " 
            << TimeDiff(initialTime, GetTime()) * 1e-3 << " seconds" << endl;

  if (mStoreInitialSamples)
  {
          cout << "Writing " << (int)mVssRays.size() << " samples to file ... ";
          ExportSamples(mVssRays);
          cout << "finished\n" << endl;

          /*VssRayContainer dummyRays;
          LoadSamples(dummyRays, mObjects);
          Debug << "rays " << (int)mVssRays.size() << " " << dummyRays.size() << endl;

          for (int i = 0; i < (int)mVssRays.size(); ++ i)
          {
                  Debug << mVssRays[i]->GetOrigin() << " " << mVssRays[i]->GetTermination() << " " << mVssRays[i]->mOriginObject << " " << mVssRays[i]->mTerminationObject << endl;
                  Debug << dummyRays[i]->GetOrigin() << " " << dummyRays[i]->GetTermination() << " " << dummyRays[i]->mOriginObject << " " << dummyRays[i]->mTerminationObject << endl << endl;
          }*/
  }

  
  //int numExportRays = 2000;
  int numExportRays = 0;

  if (numExportRays) {
        char filename[64];
        sprintf(filename, "vss-rays-initial.x3d");
        ExportRays(filename, mVssRays, numExportRays);
  }

  vssTree = new VssTree;
  // viewcells = Construct(mVssRays);

  vssTree->Construct(mVssRays, NULL);
  cout<<"VssTree root PVS size = "<<vssTree->GetRootPvsSize()<<endl;

  if (0) ExportRays("kdtree.x3d", mVssRays, 10);

  if (0)
  {
          ExportVssTree("vss-tree-100.x3d", vssTree, Vector3(1,0,0));
          ExportVssTree("vss-tree-001.x3d", vssTree, Vector3(0,0,1));
          ExportVssTree("vss-tree-101.x3d", vssTree, Vector3(1,0,1));
          ExportVssTree("vss-tree-101m.x3d", vssTree, Vector3(-1,0,-1));
          ExportVssTreeLeaves(vssTree, 10);
  }

  // viewcells->UpdatePVS(newVssRays);
  // get viewcells as kd tree boxes
  vector<AxisAlignedBox3> kdViewcells;
  if (0) {
        vector<KdLeaf *> leaves;
        mKdTree->CollectLeaves(leaves);
        vector<KdLeaf *>::const_iterator it;
        int targetLeaves = 50;
        float prob = targetLeaves/(float)leaves.size();
        for (it = leaves.begin(); it != leaves.end(); ++it)
          if (RandomValue(0.0f,1.0f) < prob)
                kdViewcells.push_back(mKdTree->GetBox(*it));

        float avgPvs = GetAvgPvsSize(vssTree, kdViewcells);
        cout<<"Initial average PVS size = "<<avgPvs<<endl;
  }


  int samples = 0;
  int pass = 0;

  
  // cast view cell samples
  while (samples < mVssSamples) 
  {
        
        int num = mVssSamplesPerPass;
        SimpleRayContainer rays;
        VssRayContainer vssRays;

        if (!mUseImportanceSampling) {
          for (int j=0; j < num; j++) {
                Vector3 viewpoint; 
                mViewCellsManager->GetViewPoint(viewpoint);
                Vector3 direction = GetDirection(viewpoint, NULL);
                rays.push_back(SimpleRay(viewpoint, direction));
          }
        } else {
          num = GenerateImportanceRays(vssTree, num, rays);
        }

        CastRays(rays, vssRays, true);
        vssTree->AddRays(vssRays);

        if (0) {
          int subdivided = vssTree->UpdateSubdivision();
          cout<<"subdivided leafs = "<<subdivided<<endl;
        }

        float avgPvs = GetAvgPvsSize(vssTree, kdViewcells);
        cout<<"Average PVS size = "<<avgPvs<<endl;

        /// compute view cell contribution of rays
        mViewCellsManager->ComputeSampleContributions(vssRays, true, false);
        
        if (numExportRays) {
          char filename[64];
          if (mUseImportanceSampling)
                sprintf(filename, "vss-rays-i%04d.x3d", pass);
          else
                sprintf(filename, "vss-rays-%04d.x3d", pass);

          ExportRays(filename, vssRays, numExportRays);
        }

        samples+=num;
        float pvs = vssTree->GetAvgPvsSize();
        cout<<"*****************************\n";
        cout<<samples<<" avgPVS ="<<pvs<<endl;
        cout<<"VssTree root PVS size = "<<vssTree->GetRootPvsSize()<<endl;
        cout<<"*****************************\n";
//      if (samples >= mVssSamples) break;
        pass ++;
  }

  if (mTestBeamSampling && mUseGlRenderer)
  {     
          TestBeamCasting(vssTree, mViewCellsManager, mObjects);
  }

  if (0)  Debug << vssTree->stat << endl;

  if (0)
  {
          VssRayContainer viewCellRays;
          // compute rays used for view cells construction
          const int numRays = mViewCellsManager->GetVisualizationSamples();
          vssTree->CollectRays(viewCellRays, numRays);
  }


  ////////////////////
  //-- render simulation after construction

  mRenderSimulator->RenderScene();
  SimulationStatistics ss;
  mRenderSimulator->GetStatistics(ss);
  Debug << "\nFinal view cells partition render time\n" << ss << endl;
  cout << "\nFinal view cells partition render time\n" << ss << endl;

  delete vssTree;
  
  return true;
}

}