source: GTP/trunk/Lib/Vis/Preprocessing/src/SamplingPreprocessor.cpp @ 2653

#include "SceneGraph.h"
#include "KdTree.h"
#include "SamplingPreprocessor.h"
#include "X3dExporter.h"
#include "Environment.h"
#include "MutualVisibility.h"
#include "Polygon3.h"
#include "ViewCell.h"
#include "ViewCellsManager.h"
#include "RenderSimulator.h"
#include "VssRay.h"
#include "SamplingStrategy.h"
#include "RayCaster.h"



namespace GtpVisibilityPreprocessor {


SamplingPreprocessor::SamplingPreprocessor(): Preprocessor(), mPass(0)
{
  // this should increase coherence of the samples
  
}

SamplingPreprocessor::~SamplingPreprocessor()
{
}




void
SamplingPreprocessor::VerifyVisibility(Intersectable *object)
{
#if 0 // 6.10. 2006 due to kdPVS removal from intersectable
  // mail all nodes from the pvs
  Intersectable::NewMail();
  KdPvsMap::iterator i = object->mKdPvs.mEntries.begin();
  for (; i != object->mKdPvs.mEntries.end(); i++) {
        KdNode *node = (*i).first;
        node->Mail();
  }
  Debug << "Get all neighbours from PVS" << endl;
  vector<KdNode *> invisibleNeighbors;
  // get all neighbors of all PVS nodes
  i = object->mKdPvs.mEntries.begin();
  for (; i != object->mKdPvs.mEntries.end(); i++) {
        KdNode *node = (*i).first;
        mKdTree->FindNeighbors(node, invisibleNeighbors, true);
        AxisAlignedBox3 box = object->GetBox();
        for (int j=0; j < invisibleNeighbors.size(); j++) {
          int visibility = ComputeBoxVisibility(mSceneGraph,
                                                                                        mKdTree,
                                                                                        box,
                                                                                        mKdTree->GetBox(invisibleNeighbors[j]),
                                                                                        1e-6f);
          //          exit(0);
        }
        // now rank all the neighbors according to probability that a new
        // sample creates some contribution
  }
#endif
}

bool
SamplingPreprocessor::ComputeVisibility()
{
  
  Debug << "type: sampling" << endl;
  
  cout<<"Sampling Preprocessor started\n"<<flush;
  //  cout<<"Memory/ray "<<sizeof(VssRay)+sizeof(RssTreeNode::RayInfo)<<endl;
  
  Randomize(0);
  const long startTime = GetTime();
  int totalSamples = 0;

  // if not already loaded, construct view cells from file
  if (!mLoadViewCells) {
        ConstructViewCells();
  }
  
  int intersectables, faces;
  mSceneGraph->GetStatistics(intersectables, faces);
  HaltonSequence posHalton;
  
  int samples = 0;
  int rssSamples = 0;

  map<ViewCell *, HaltonSequence> dirHalton;
  int lastEvaluation = 0;
  SimpleRayContainer rays;
  VssRayContainer vssRays;

  while (samples < mTotalSamples) {
        for (int i=0; i < mSamplesPerPass;) {
          
          mRayCaster->InitPass();
          
          float r[5];
          Vector3 origin, direction;
          posHalton.GetNext(3, r);

          mViewCellsManager->GetViewPoint(origin, Vector3(r[0], r[1], r[2]));
          ViewCell *viewcell = mViewCellsManager->GetViewCell(origin);
          
          if (!viewcell || !viewcell->GetValid())
                continue;

          rays.clear();
          vssRays.clear();

          for (; rays.size() < 16; ) {
                if (i%100000 == 0) {
                  cout<<samples/1e6f<<"M rays, progress: "<<(samples*100.0f)/mTotalSamples<<" %   \r";
                }
                
                dirHalton[viewcell].GetNext(2, r);
                direction = UniformRandomVector(r[0],r[1]);
                //direction = UniformRandomVector();
                
                // cast rays in both directions to make the number of samples comparable
                // with the global sampling method which also casts a "double" ray per sample
                rays.push_back(SimpleRay(origin,
                                                                 direction,
                                                                 SamplingStrategy::DIRECTION_BASED_DISTRIBUTION,
                                                                 1.0f));
                i++;
                samples++;
          }
          
          CastRays(rays,
                           vssRays,
                           true,
                           true);
          

          rssSamples += (int)vssRays.size();
          for (int j=0; j < vssRays.size(); j++)
                if (vssRays[j]->mFlags & VssRay::Valid) {
                  Intersectable *obj = vssRays[j]->mTerminationObject;
                  if (obj) {
                        // if ray not outside of view space
                        float pdf = 1.0f;
                        //                      ViewCell *viewcell = viewcells[j/2];
                        
                        ObjectPvs &pvs = viewcell->GetPvs();
                        pvs.AddSampleDirtyCheck(obj, pdf);
                        
                        if (pvs.RequiresResort())  {
                          pvs.SimpleSort();
                        }
                  }
                }
          
          if (samples > mTotalSamples)
                break;
        }


        if (samples - lastEvaluation >= mSamplesPerEvaluation) {
          Real time = TimeDiff(startTime, GetTime());
          mViewCellsManager->PrintPvsStatistics(mStats);
          mStats <<
                "#Pass\n" <<mPass<<endl<<
                "#Time\n" << time <<endl<<
                "#TotalSamples\n" <<samples<<endl<<
                "#RssSamples\n" <<rssSamples<<endl;
          lastEvaluation = samples;
          
          if (renderer) {
                ComputeRenderError();
          }
          
        }

        Real time = TimeDiff(startTime, GetTime());
        if (mTotalTime != -1 && time/1000 > mTotalTime)
          break;
        
  }
  if (0) {
        Exporter *exporter = Exporter::GetExporter("ray-density.x3d"); 
        exporter->SetExportRayDensity(true);
        exporter->ExportKdTree(*mKdTree);
        delete exporter;
  }
        
        
        // $$JB temporary removed
  //    mViewCellsManager->PostProcess(objects, mSampleRays);
  
  //-- several visualizations and statistics
  Debug << "view cells after post processing: " << endl;
  mViewCellsManager->PrintStatistics(Debug);
  
  EvalViewCellHistogram();

  //-- render simulation after merge
  cout << "\nevaluating bsp view cells render time after merge ... ";
  
  mRenderSimulator->RenderScene();
  SimulationStatistics ss;
  mRenderSimulator->GetStatistics(ss);
  
  cout << " finished" << endl;
  cout << ss << endl;
  Debug << ss << endl;
  
  // $$JB temporary removed
        //mViewCellsManager->Visualize(objects, mSampleRays);   
  
  return true;
}


}