source: GTP/trunk/Lib/Vis/Preprocessing/src/GvsPreprocessor.cpp @ 1460

#include "Environment.h"
#include "GvsPreprocessor.h"
#include "GlRenderer.h"

namespace GtpVisibilityPreprocessor
{
  

GvsPreprocessor::GvsPreprocessor():Preprocessor()
{
  environment->GetIntValue("RenderSampler.samples", mSamples);
  cout << "number of render samples: " << mSamples << endl;
}
  

void
GvsPreprocessor::GenerateRandomRay(Ray &ray)
{
  int objId = RandomValue(0, mObjects.size());
  Intersectable *object = objects[objId];
  object->GetRandomSurfacePoint(point, normal);
  direction = UniformRandomVector(normal);
  SetupRay(ray, point, direction);
}

void
GvsPreprocessor::HandleRay(Ray &ray)
{
  int sampleContributions = 0;
  
  mKdTree->CastRay(ray);
  
  if (ray.leaves.size()) {
        sampleContributions += AddNodeSamples(object, ray, pass);
    
        if (ray.intersections.size()) {
          sampleContributions += AddNodeSamples(ray.intersections[0].mObject, ray, pass);
        }
  }
}

void
GvsPreprocessor::BorderSampling(Ray &ray)
{
  
  
}

void
GvsPreprocessor::Pass()
{
  Ray ray;
  while (1) {
        AvsGenerateRay(ray);
        HandleRay(ray);
        while ( !mRayQueue.empty() ) {
          Ray ray = mRayQueue.pop();
          mRayQueue.pop();
          AdaptiveBorderSampling(ray);
        }
  }
}


bool
GvsPreprocessor::ComputeVisibility()
{
  long startTime = GetTime();


  Debug << "type: gvs" << endl;
  
  cout<<"Gvs Preprocessor started\n"<<flush;
  //  cout<<"Memory/ray "<<sizeof(VssRay)+sizeof(RssTreeNode::RayInfo)<<endl;

  Randomize(0);
  
  long startTime = GetTime();
  
  int totalSamples = 0;
  
  ConstructViewCells();
  
  int samples = 0;
  int i=0;
  while (samples < mTotalSamples) {
        for (i=0; i < mSamplesPerPass; i++, samples++) {
          
          if (i%10000 == 0)
                cout<<"+";
          
          Vector3 origin, direction;
          mViewCellsManager->GetViewPoint(origin);
          direction = UniformRandomVector();
          
          ViewCell *viewcell = mViewCellsManager->GetViewCell(origin);
          
          if (viewcell && viewcell->GetValid()) {
                // 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
                for (int j=0; j < 2; j++) {
                  Intersectable *object = CastRay(origin, direction);
                  if (object) {
                        // if ray not outside of view space
                        float contribution;
                        int pvsContribution = 0;
                        float relativePvsContribution = 0;
                        if (object) {
                          float pdf = 1.0f;
                          if (viewcell->GetPvs().GetSampleContribution(object,
                                                                                                                   pdf,
                                                                                                                   contribution))
                                ++pvsContribution;
                          relativePvsContribution += contribution;
                          viewcell->GetPvs().AddSample(object, pdf);
                        }
                  }
                  direction = -direction;
                }
          }
          
          if (samples > mTotalSamples)
                break;
        }
        
        //      mVssRays.PrintStatistics(mStats);
        mStats <<
          "#Time\n" << TimeDiff(startTime, GetTime())*1e-3<<endl<<
          "#TotalSamples\n" <<samples<<endl;

        mViewCellsManager->PrintPvsStatistics(mStats);
        // ComputeRenderError();
  }
  
  //  HoleSamplingPass();
        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);
        
        //-- 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;
}

}