source: GTP/trunk/Lib/Vis/Preprocessing/src/Preprocessor.cpp @ 2017

#include "SceneGraph.h"
#include "Exporter.h"
#include "UnigraphicsParser.h"
#include "X3dParser.h"
#include "Preprocessor.h"
#include "ViewCell.h"
#include "Environment.h"
#include "ViewCellsManager.h"
#include "ViewCellBsp.h"
#include "VspBspTree.h"
#include "RenderSimulator.h"
#include "GlRenderer.h"
#include "PlyParser.h"
#include "SamplingStrategy.h"
#include "VspTree.h"
#include "OspTree.h"
#include "ObjParser.h"
#include "BvHierarchy.h"
#include "HierarchyManager.h"
#include "VssRay.h"
#include "IntelRayCaster.h"
#include "InternalRayCaster.h"
#include "GlobalLinesRenderer.h"


#define DEBUG_RAYCAST 0
#define SHOW_RAYCAST_TIMING 1


namespace GtpVisibilityPreprocessor {

  const static bool ADDITIONAL_GEOMETRY_HACK = false;

  Preprocessor *preprocessor = NULL;
  
// HACK: Artificially modify scene to watch rendercost changes
static void AddGeometry(SceneGraph *scene)
{
        scene->GetRoot()->UpdateBox();

        AxisAlignedBox3 sceneBox = scene->GetBox();

        int n = 200;

        if (0)
        {
                // form grid of boxes
                for (int i = 0; i < n; ++ i)
                {
                        for (int j = 0; j < n; ++ j)
                        {
                                const Vector3 scale2((float)j * 0.8f / n + 0.1f,  0.05f, (float)i * 0.8f  / (float)n + 0.1f);

                                const Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());

                                const Vector3 boxSize = sceneBox.Size() * Vector3(0.0025f, 0.01f, 0.0025f);
                                AxisAlignedBox3 box(pt2, pt2 + boxSize);
                                Mesh *mesh = CreateMeshFromBox(box);

                                mesh->Preprocess();

                                MeshInstance *mi = new MeshInstance(mesh);
                                scene->GetRoot()->mGeometry.push_back(mi);
                        }
                }

                for (int i = 0; i < n; ++ i)
                {
                        for (int j = 0; j < n; ++ j)
                        {
                                const Vector3 scale2(0.15f, (float)j * 0.8f / n + 0.1f, (float)i * 0.8f  / (float)n + 0.1f);

                                Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());

                                Vector3 boxSize = sceneBox.Size() * Vector3(0.0025f, 0.01f, 0.0025f);
                                AxisAlignedBox3 box(pt2, pt2 + boxSize);
                                Mesh *mesh = CreateMeshFromBox(box);

                                mesh->Preprocess();

                                MeshInstance *mi = new MeshInstance(mesh);
                                scene->GetRoot()->mGeometry.push_back(mi);
                        }
                }

                for (int i = 0; i < n; ++ i)
                {
                        const Vector3 scale2(2, 0.2f, (float)i * 0.8f  / (float)n + 0.1f);

                        Vector3 pt2 = sceneBox.Min() + scale2 * (sceneBox.Max() - sceneBox.Min());
                        Vector3 boxSize = sceneBox.Size() * Vector3(0.005f, 0.02f, 0.005f);

                        AxisAlignedBox3 box(pt2 + 0.1f, pt2 + boxSize);
                        Mesh *mesh = CreateMeshFromBox(box);

                        mesh->Preprocess();

                        MeshInstance *mi = new MeshInstance(mesh);
                        scene->GetRoot()->mGeometry.push_back(mi);
                }

                scene->GetRoot()->UpdateBox();
        }

        if (1)
        {
                // plane separating view space regions
                const Vector3 scale(1.0f, 0.0, 0);

                Vector3 pt = sceneBox.Min() + scale * (sceneBox.Max() - sceneBox.Min());

                Plane3 cuttingPlane(Vector3(1, 0, 0), pt);
                Mesh *planeMesh = new Mesh();

                Polygon3 *poly = sceneBox.CrossSection(cuttingPlane);
                IncludePolyInMesh(*poly, *planeMesh);

                planeMesh->Preprocess();

                MeshInstance *planeMi = new MeshInstance(planeMesh);
                scene->GetRoot()->mGeometry.push_back(planeMi);
        }       
}


Preprocessor::Preprocessor():
mKdTree(NULL),
mBspTree(NULL),
mVspBspTree(NULL),
mViewCellsManager(NULL),
mRenderSimulator(NULL),
mPass(0),
mSceneGraph(NULL),
mRayCaster(NULL),
mStopComputation(false),
mThread(NULL),
mGlobalLinesRenderer(NULL)
{
        Environment::GetSingleton()->GetBoolValue("Preprocessor.useGlRenderer", mUseGlRenderer);
  
        // renderer will be constructed when the scene graph and viewcell manager will be known
        renderer = NULL;
        
        Environment::GetSingleton()->GetBoolValue("Preprocessor.useGlDebugger", mUseGlDebugger);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.loadMeshes", mLoadMeshes);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.quitOnFinish", mQuitOnFinish);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.computeVisibility", mComputeVisibility);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.detectEmptyViewSpace", mDetectEmptyViewSpace);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.exportVisibility", mExportVisibility );
        
        char buffer[256];
        Environment::GetSingleton()->GetStringValue("Preprocessor.visibilityFile",  buffer);
        mVisibilityFileName = buffer;
        
        Environment::GetSingleton()->GetStringValue("Preprocessor.stats",  buffer);
        mStats.open(buffer);
        
        
        Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilityFilter", mApplyVisibilityFilter);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.applyVisibilitySpatialFilter",
                                                                                          mApplyVisibilitySpatialFilter );
        Environment::GetSingleton()->GetFloatValue("Preprocessor.visibilityFilterWidth", mVisibilityFilterWidth);

        Environment::GetSingleton()->GetBoolValue("Preprocessor.exportObj", mExportObj);
        
        Environment::GetSingleton()->GetBoolValue("Preprocessor.useViewSpaceBox", mUseViewSpaceBox);

        Environment::GetSingleton()->GetBoolValue("Preprocessor.Export.rays", mExportRays);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.Export.animation", mExportAnimation);
        Environment::GetSingleton()->GetIntValue("Preprocessor.Export.numRays", mExportNumRays);

        Environment::GetSingleton()->GetIntValue("Preprocessor.samplesPerPass", mSamplesPerPass);
        Environment::GetSingleton()->GetIntValue("Preprocessor.totalSamples", mTotalSamples);
        Environment::GetSingleton()->GetIntValue("Preprocessor.samplesPerEvaluation",
                                                                                         mSamplesPerEvaluation);

        Debug << "******* Preprocessor Options **********" << endl;
        Debug << "detect empty view space=" << mDetectEmptyViewSpace << endl;
        Debug << "load meshes: " << mLoadMeshes << endl;
        Debug << "load meshes: " << mLoadMeshes << endl;
        Debug << "export obj: " << mExportObj << endl;
        Debug << "use view space box: " << mUseViewSpaceBox << endl;
}


Preprocessor::~Preprocessor()
{
        cout << "cleaning up" << endl;

        cout << "Deleting view cells manager ... \n";
        DEL_PTR(mViewCellsManager);
        cout << "done.\n";

        cout << "Deleting bsp tree ... \n";
        DEL_PTR(mBspTree);
        cout << "done.\n";

        cout << "Deleting kd tree ...\n";
        DEL_PTR(mKdTree);
        cout << "done.\n";

        cout << "Deleting vspbsp tree ... \n";
        DEL_PTR(mVspBspTree);
        cout << "done.\n";

        cout << "Deleting scene graph ... \n";
        DEL_PTR(mSceneGraph);
        cout << "done.\n";

        cout << "deleting render simulator ... \n";
        DEL_PTR(mRenderSimulator);
        mRenderSimulator = NULL;
        cout << "deleting renderer ... \n";
        DEL_PTR(renderer);
        renderer = NULL;
        cout << "deleting ray caster ... \n";
        DEL_PTR(mRayCaster);

#ifdef USE_CG
        cout << "deleting global lines renderer ... \n";
        DEL_PTR(mGlobalLinesRenderer);
#endif
        cout << "finished" << endl;
}


GlRendererBuffer *Preprocessor::GetRenderer() 
{ 
        return renderer;
}


static int SplitFilenames(const string str, vector<string> &filenames)
{
        int pos = 0;

        while(1) {
                int npos = (int)str.find(';', pos);
                
                if (npos < 0 || npos - pos < 1)
                        break;
                filenames.push_back(string(str, pos, npos - pos));
                pos = npos + 1;
        }
        
        filenames.push_back(string(str, pos, str.size() - pos));
        return (int)filenames.size();
}


void Preprocessor::SetThread(PreprocessorThread *t)
{
        mThread = t;
}


PreprocessorThread *Preprocessor::GetThread() const 
{
        return mThread;
}

#define POWERPLANT_HACK 1

bool Preprocessor::LoadBinaryObj(const string filename,
                                                                 SceneGraphNode *root,
                                                                 vector<FaceParentInfo> *parents)
{
        //ifstream samplesIn(filename, ios::binary);
        igzstream samplesIn(filename.c_str());
        
        if (!samplesIn.is_open())
                return false;

        cout << "binary obj dump available, loading " << filename.c_str() << endl;
        
        // table for vertices
        VertexContainer vertices; 
        
        if (parents)
                cout << "using face parents" << endl;
        else
                cout << "not using face parents" << endl;

        // read in triangle size
        int numTriangles;

        samplesIn.read(reinterpret_cast<char *>(&numTriangles), sizeof(int));
        root->mGeometry.reserve(numTriangles);
        cout << "loading " << numTriangles << " triangles (" 
                 << numTriangles * (sizeof(TriangleIntersectable) + sizeof(TriangleIntersectable *)) / (1024 * 1024) << " MB)" << endl;

        int i = 0;
        while (1)
        {
                Triangle3 tri;
                
                samplesIn.read(reinterpret_cast<char *>(tri.mVertices + 0), sizeof(Vector3));
                samplesIn.read(reinterpret_cast<char *>(tri.mVertices + 1), sizeof(Vector3));
                samplesIn.read(reinterpret_cast<char *>(tri.mVertices + 2), sizeof(Vector3));

                // end of file reached
                if (samplesIn.eof())
                        break;

                TriangleIntersectable *obj = new TriangleIntersectable(tri);
                root->mGeometry.push_back(obj);
                
                i ++;
        
                if (i % 500000 == 499999)
                         cout<<"\r"<<i<<"/"<<numTriangles<<"\r";
        }
        
        if (i != numTriangles)
        {
                cout << "warning: triangle size does not match with loaded triangle size" << endl;
                return false;
        }

        cout << "loaded " << numTriangles << " triangles" << endl;

        return true;
}


bool Preprocessor::ExportBinaryObj(const string filename, SceneGraphNode *root)
{
        ogzstream samplesOut(filename.c_str());

        if (!samplesOut.is_open())
                return false;

        int numTriangles = (int)root->mGeometry.size();

        samplesOut.write(reinterpret_cast<char *>(&numTriangles), sizeof(int));

        ObjectContainer::const_iterator oit, oit_end = root->mGeometry.end();

        for (oit = root->mGeometry.begin(); oit != oit_end; ++ oit)
        {
                Intersectable *obj = *oit;

                if (obj->Type() == Intersectable::TRIANGLE_INTERSECTABLE)
                {
                        Triangle3 tri = static_cast<TriangleIntersectable *>(obj)->GetItem();

                        samplesOut.write(reinterpret_cast<char *>(tri.mVertices + 0), sizeof(Vector3));
                        samplesOut.write(reinterpret_cast<char *>(tri.mVertices + 1), sizeof(Vector3));
                        samplesOut.write(reinterpret_cast<char *>(tri.mVertices + 2), sizeof(Vector3));
                }
                else
                {
                        cout << "not implemented intersectable type " << obj->Type() << endl;
                }
        }

        cout << "exported " << numTriangles << " triangles" << endl;

        return true;
}


bool Preprocessor::ExportObj(const string filename, const ObjectContainer &objects)
{
        ofstream samplesOut(filename.c_str());

        if (!samplesOut.is_open())
                return false;

        ObjectContainer::const_iterator oit, oit_end = objects.end();

        //AxisAlignedBox3 bbox = mSceneGraph->GetBox(); bbox.Enlarge(30.0);
        for (oit = objects.begin(); oit != oit_end; ++ oit)
        {
                Intersectable *obj = *oit;

                if (obj->Type() == Intersectable::TRIANGLE_INTERSECTABLE)
                {
                        Triangle3 tri = static_cast<TriangleIntersectable *>(obj)->GetItem();
                        //if (!(bbox.IsInside(tri.mVertices[0]) && bbox.IsInside(tri.mVertices[1]) && bbox.IsInside(tri.mVertices[2])))continue;
                        
                        samplesOut << "v " << tri.mVertices[0].x << " " << tri.mVertices[0].y << " " << tri.mVertices[0].z << endl;
                        samplesOut << "v " << tri.mVertices[1].x << " " << tri.mVertices[1].y << " " << tri.mVertices[1].z << endl;
                        samplesOut << "v " << tri.mVertices[2].x << " " << tri.mVertices[2].y << " " << tri.mVertices[2].z << endl;
                        //}
                }
                else
                {
                        cout << "not implemented intersectable type " << obj->Type() << endl;
                }
        }

        // write faces
        int i = 1;
        for (oit = objects.begin(); oit != oit_end; ++ oit)
        {
                Intersectable *obj = *oit;
                if (obj->Type() == Intersectable::TRIANGLE_INTERSECTABLE)
                {
                        //Triangle3 tri = static_cast<TriangleIntersectable *>(obj)->GetItem();
                        //if (!(bbox.IsInside(tri.mVertices[0]) && bbox.IsInside(tri.mVertices[1]) && bbox.IsInside(tri.mVertices[2]))) continue;
                        
                        Triangle3 tri = static_cast<TriangleIntersectable *>(obj)->GetItem();
                        samplesOut << "f " << i << " " << i + 1 << " " << i + 2 << endl;
                        i += 3;
                }
                else
                {
                        cout << "not implemented intersectable type " << obj->Type() << endl;
                }
        }

        return true;

}

static string ReplaceSuffix(string filename, string a, string b)
{
        string result = filename;

        int pos = (int)filename.rfind(a, (int)filename.size() - 1);
        if (pos == filename.size() - a.size()) {
                result.replace(pos, a.size(), b);
        }
        return result;
}


Intersectable *Preprocessor::GetParentObject(const int index) const
{
        if (index < 0)
        {
                //cerr << "Warning: triangle index smaller zero! " << index << endl;
                return NULL;
        }
        
        if (!mFaceParents.empty())
        {
                if (index >= (int)mFaceParents.size())
                {
                        cerr << "Warning: triangle index out of range! " << index << endl;
                        return NULL;
                }
                else
                {
                        return mFaceParents[index].mObject;
                }
        }
        else
        {
                  if (index >= (int)mObjects.size()) 
                  {
                          cerr<<"Warning: triangle  index out of range! " << index << endl;
                          return NULL;
                  }
                  else
                  {
                          return mObjects[index];
                  }
        }
}


Vector3 Preprocessor::GetParentNormal(const int index) const
{
        if (!mFaceParents.empty())
        {
                return mFaceParents[index].mObject->GetNormal(mFaceParents[index].mFaceIndex);
        }       
        else
        {
                return mObjects[index]->GetNormal(0);
        }
}


bool
Preprocessor::LoadScene(const string filename)
{
    // use leaf nodes of the original spatial hierarchy as occludees
        mSceneGraph = new SceneGraph;
  
        Parser *parser;
        vector<string> filenames;
        const int files = SplitFilenames(filename, filenames);
        cout << "number of input files: " << files << endl;
        bool result = false;
        bool isObj = false;

        // root for different files
        mSceneGraph->SetRoot(new SceneGraphNode());

        // intel ray caster can only trace triangles
        int rayCastMethod;
        Environment::GetSingleton()->GetIntValue("Preprocessor.rayCastMethod", rayCastMethod);
        vector<FaceParentInfo> *fi = 
          ((rayCastMethod == RayCaster::INTEL_RAYCASTER) && mLoadMeshes) ?
          &mFaceParents : NULL;
        
        if (files == 1) 
          {
                if (strstr(filename.c_str(), ".x3d"))
                  {
                        parser = new X3dParser;
                        
                        result = parser->ParseFile(filename, 
                                                                           mSceneGraph->GetRoot(),
                                                                           mLoadMeshes,
                                                                           fi);
                        delete parser;
                }
                else if (strstr(filename.c_str(), ".ply") || strstr(filename.c_str(), ".plb"))
                {
                        parser = new PlyParser;

                        result = parser->ParseFile(filename, 
                                                                           mSceneGraph->GetRoot(),
                                                                           mLoadMeshes,
                                                                           fi);
                        delete parser;
                }
                else if (strstr(filename.c_str(), ".obj"))
                {
                        isObj = true;

                        // hack: load binary dump
                        const string bnFile = ReplaceSuffix(filename, ".obj", ".bn");
                        
                        if (!mLoadMeshes)
                        {
                                result = LoadBinaryObj(bnFile, mSceneGraph->GetRoot(), fi);
                        }

                        // parse obj
            if (!result)
                        {
                                cout << "no binary dump available or loading full meshes, parsing file" << endl;
                                parser = new ObjParser;
                
                                result = parser->ParseFile(filename, 
                                                                   mSceneGraph->GetRoot(),
                                                                   mLoadMeshes,
                                                                   fi);
                                                
                                cout << "loaded " << (int)mSceneGraph->GetRoot()->mGeometry.size() << " entities" << endl;
                                // only works for triangles
                                if (result && !mLoadMeshes)
                                {
                                        cout << "exporting binary obj to " << bnFile << "... " << endl;
                                        ExportBinaryObj(bnFile, mSceneGraph->GetRoot());
                                        cout << "finished" << endl;
                                }

                                delete parser;
                        }
                        else if (0)
                        {
                                ExportBinaryObj("../data/test.bn", mSceneGraph->GetRoot());
                        }
                }
                else 
                {
                        parser = new UnigraphicsParser;
                        result = parser->ParseFile(filename, 
                                                                           mSceneGraph->GetRoot(),
                                                                           mLoadMeshes,                                                           
                                                                           fi);
                        delete parser;
                }
                
                cout << filename << endl;
        } 
        else 
        {
                vector<string>::const_iterator fit, fit_end = filenames.end();
                
                for (fit = filenames.begin(); fit != fit_end; ++ fit) 
                {
                        const string filename = *fit;

                        cout << "parsing file " << filename.c_str() << endl;
                        if (strstr(filename.c_str(), ".x3d"))
                                parser = new X3dParser;
                        else 
                                parser = new UnigraphicsParser;

                        SceneGraphNode *node = new SceneGraphNode();
                        const bool success = 
                                parser->ParseFile(filename, node, mLoadMeshes, fi);

                        if (success) 
                        { 
                                mSceneGraph->GetRoot()->mChildren.push_back(node);
                                result = true; // at least one file parsed
                        }

                        // temporare hack
                        //if (!strstr(filename.c_str(), "plane")) mSceneGraph->GetRoot()->UpdateBox();

                        delete parser;
                }
        }
        
        if (result) 
        { 
                // HACK 
                if (ADDITIONAL_GEOMETRY_HACK)
                        AddGeometry(mSceneGraph);

                mSceneGraph->AssignObjectIds();
 
                int intersectables, faces;
                mSceneGraph->GetStatistics(intersectables, faces);
 
                cout<<filename<<" parsed successfully."<<endl;
                cout<<"#NUM_OBJECTS (Total numner of objects)\n"<<intersectables<<endl;
                cout<<"#NUM_FACES (Total numner of faces)\n"<<faces<<endl;
                
                mObjects.reserve(intersectables);
                mSceneGraph->CollectObjects(&mObjects);
                
                // temp hack
                //ExportObj("cropped_vienna.obj", mObjects);
                mSceneGraph->GetRoot()->UpdateBox();
                                
                cout << "finished loading" << endl;
        }

        return result;
}

bool
Preprocessor::ExportPreprocessedData(const string filename)
{
        mViewCellsManager->ExportViewCells(filename, true, mObjects);
        return true;
}


bool
Preprocessor::PostProcessVisibility()
{
  
  if (mApplyVisibilityFilter || mApplyVisibilitySpatialFilter) {
        cout<<"Applying visibility filter ...";
        cout<<"filter width = " << mVisibilityFilterWidth << endl;
        
        if (!mViewCellsManager)
          return false;
        
        mViewCellsManager->ApplyFilter(mKdTree,
                                                                   mApplyVisibilityFilter ? mVisibilityFilterWidth : -1.0f,
                                                                   mApplyVisibilitySpatialFilter ? mVisibilityFilterWidth : -1.0f);
        cout << "done." << endl;
  }
  
  // export the preprocessed information to a file
  if (mExportVisibility)
  {
          ExportPreprocessedData(mVisibilityFileName);
  }

  return true;
}


bool
Preprocessor::BuildKdTree()
{
  mKdTree = new KdTree;

  // add mesh instances of the scene graph to the root of the tree
  KdLeaf *root = (KdLeaf *)mKdTree->GetRoot();
        
  mSceneGraph->CollectObjects(&root->mObjects);
  
  const long startTime = GetTime();
  cout << "building kd tree ... " << endl;

  mKdTree->Construct();

  cout << "finished kd tree construction in " << TimeDiff(startTime, GetTime()) * 1e-3 
           << " secs " << endl;

  return true;
}


void
Preprocessor::KdTreeStatistics(ostream &s)
{
  s<<mKdTree->GetStatistics();
}

void
Preprocessor::BspTreeStatistics(ostream &s)
{
        s << mBspTree->GetStatistics();
}

bool
Preprocessor::Export( const string filename,
                                          const bool scene,
                                          const bool kdtree
                                          )
{
  Exporter *exporter = Exporter::GetExporter(filename);
        
  if (exporter) {
    if (2 && scene)
      exporter->ExportScene(mSceneGraph->GetRoot());

    if (1 && kdtree) {
      exporter->SetWireframe();
      exporter->ExportKdTree(*mKdTree);
    }

    delete exporter;
    return true;
  }

  return false;
}


bool Preprocessor::PrepareViewCells()
{
        ///////
        //-- parse view cells construction method

        Environment::GetSingleton()->GetBoolValue("ViewCells.loadFromFile", mLoadViewCells);
        char buf[100];

        if (mLoadViewCells)
        {       
                Environment::GetSingleton()->GetStringValue("ViewCells.filename", buf);
                cout << "loading view cells from " << buf << endl<<flush;

                mViewCellsManager = ViewCellsManager::LoadViewCells(buf, &mObjects, true, NULL);

                cout << "view cells loaded." << endl<<flush;

                if (!mViewCellsManager)
                {
                        return false;
                }
        }
        else
        {
                // parse type of view cell container
                Environment::GetSingleton()->GetStringValue("ViewCells.type", buf);             
                mViewCellsManager = CreateViewCellsManager(buf);

                // default view space is the extent of the scene
                AxisAlignedBox3 viewSpaceBox;

                if (mUseViewSpaceBox)
                {
                        viewSpaceBox = mSceneGraph->GetBox();

                        // use a small box outside of the scene
                        viewSpaceBox.Scale(Vector3(0.15f, 0.3f, 0.5f));
                        //viewSpaceBox.Translate(Vector3(Magnitude(mSceneGraph->GetBox().Size()) * 0.5f, 0, 0));
                        viewSpaceBox.Translate(Vector3(Magnitude(mSceneGraph->GetBox().Size()) * 0.3f, 0, 0));
                        mViewCellsManager->SetViewSpaceBox(viewSpaceBox);
                }
                else
                {
                        viewSpaceBox = mSceneGraph->GetBox();
                        mViewCellsManager->SetViewSpaceBox(viewSpaceBox);
                }

                bool loadVcGeometry;
                Environment::GetSingleton()->GetBoolValue("ViewCells.loadGeometry", loadVcGeometry);

                bool extrudeBaseTriangles;
                Environment::GetSingleton()->GetBoolValue("ViewCells.useBaseTrianglesAsGeometry", extrudeBaseTriangles);

                char vcGeomFilename[100];
                Environment::GetSingleton()->GetStringValue("ViewCells.geometryFilename", vcGeomFilename);

                // create view cells from specified geometry
                if (loadVcGeometry)
                {
                        if (mViewCellsManager->GetType() == ViewCellsManager::BSP)
                        {
                                if (!mViewCellsManager->LoadViewCellsGeometry(vcGeomFilename, extrudeBaseTriangles))
                                {
                                        cerr << "loading view cells geometry failed" << endl;
                                }
                        }
                        else
                        {
                                cerr << "loading view cells geometry is not implemented for this manager" << endl;
                        }
                }
        }

        ////////
        //-- evaluation of render cost heuristics

        float objRenderCost = 0, vcOverhead = 0, moveSpeed = 0;

        Environment::GetSingleton()->GetFloatValue("Simulation.objRenderCost",objRenderCost);
        Environment::GetSingleton()->GetFloatValue("Simulation.vcOverhead", vcOverhead);
        Environment::GetSingleton()->GetFloatValue("Simulation.moveSpeed", moveSpeed);

        mRenderSimulator = 
                new RenderSimulator(mViewCellsManager, objRenderCost, vcOverhead, moveSpeed);

        mViewCellsManager->SetRenderer(mRenderSimulator);
        
        mViewCellsManager->SetPreprocessor(this);

        return true;
}

  
bool Preprocessor::ConstructViewCells()
{
        // construct view cells using it's own set of samples
        mViewCellsManager->Construct(this);

        // visualizations and statistics
        Debug << "finished view cells:" << endl;
        mViewCellsManager->PrintStatistics(Debug);

        return true;
}


ViewCellsManager *Preprocessor::CreateViewCellsManager(const char *name)
{
        ViewCellsTree *vcTree = new ViewCellsTree;

        if (strcmp(name, "kdTree") == 0)
        {
                mViewCellsManager = new KdViewCellsManager(vcTree, mKdTree);
        }
        else if (strcmp(name, "bspTree") == 0)
        {
                Debug << "view cell type: Bsp" << endl;

                mBspTree = new BspTree();
                mViewCellsManager = new BspViewCellsManager(vcTree, mBspTree);
        }
        else if (strcmp(name, "vspBspTree") == 0)
        {
                Debug << "view cell type: VspBsp" << endl;

                mVspBspTree = new VspBspTree();
                mViewCellsManager = new VspBspViewCellsManager(vcTree, mVspBspTree);
        }
        else if (strcmp(name, "vspOspTree") == 0)
        {
                Debug << "view cell type: VspOsp" << endl;
                char buf[100];          
                Environment::GetSingleton()->GetStringValue("Hierarchy.type", buf);     

                mViewCellsManager = new VspOspViewCellsManager(vcTree, buf);
        }
        else if (strcmp(name, "sceneDependent") == 0) //TODO
        {
                Debug << "view cell type: Bsp" << endl;
                
                mBspTree = new BspTree();
                mViewCellsManager = new BspViewCellsManager(vcTree, mBspTree);
        }
        else
        {
                cerr << "Wrong view cells type " << name << "!!!" << endl;
                exit(1);
        }

        return mViewCellsManager;
}


// use ascii format to store rays
#define USE_ASCII 0


static inline bool ilt(Intersectable *obj1, Intersectable *obj2)
{
        return obj1->mId < obj2->mId;
}


bool Preprocessor::LoadKdTree(const string filename)
{
        mKdTree = new KdTree();

        return mKdTree->LoadBinTree(filename.c_str(), mObjects);
}


bool Preprocessor::ExportKdTree(const string filename)
{
        return mKdTree->ExportBinTree(filename.c_str());
}


bool Preprocessor::LoadSamples(VssRayContainer &samples, 
                                                           ObjectContainer &objects) const
{
        std::stable_sort(objects.begin(), objects.end(), ilt);
        char fileName[100];
        Environment::GetSingleton()->GetStringValue("Preprocessor.samplesFilename", fileName);
        
    Vector3 origin, termination;
        // HACK: needed only for lower_bound algorithm to find the 
        // intersected objects
        MeshInstance sObj(NULL);
        MeshInstance tObj(NULL);

#if USE_ASCII
        ifstream samplesIn(fileName);
        if (!samplesIn.is_open())
                return false;

        string buf;
        while (!(getline(samplesIn, buf)).eof())
        {
                sscanf(buf.c_str(), "%f %f %f %f %f %f %d %d", 
                           &origin.x, &origin.y, &origin.z,
                           &termination.x, &termination.y, &termination.z, 
                           &(sObj.mId), &(tObj.mId));
                
                Intersectable *sourceObj = NULL;
                Intersectable *termObj = NULL;
                
                if (sObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &sObj, ilt);
                        sourceObj = *oit;
                }
                
                if (tObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &tObj, ilt);
                        termObj = *oit;
                }

                samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
        }
#else
        ifstream samplesIn(fileName, ios::binary);
        if (!samplesIn.is_open())
                return false;

        while (1)
        {
                 samplesIn.read(reinterpret_cast<char *>(&origin), sizeof(Vector3));
                 samplesIn.read(reinterpret_cast<char *>(&termination), sizeof(Vector3));
                 samplesIn.read(reinterpret_cast<char *>(&(sObj.mId)), sizeof(int));
                 samplesIn.read(reinterpret_cast<char *>(&(tObj.mId)), sizeof(int));
                
                 if (samplesIn.eof())
                        break;

                Intersectable *sourceObj = NULL;
                Intersectable *termObj = NULL;
                
                if (sObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &sObj, ilt);
                        sourceObj = *oit;
                }
                
                if (tObj.mId >= 0)
                {
                        ObjectContainer::iterator oit =
                                lower_bound(objects.begin(), objects.end(), &tObj, ilt);
                        termObj = *oit;
                }

                samples.push_back(new VssRay(origin, termination, sourceObj, termObj));
        }
#endif

        samplesIn.close();

        return true;
}


bool Preprocessor::ExportSamples(const VssRayContainer &samples) const
{
        char fileName[100];
        Environment::GetSingleton()->GetStringValue("Preprocessor.samplesFilename", fileName);
        

        VssRayContainer::const_iterator it, it_end = samples.end();
        
#if USE_ASCII
        ofstream samplesOut(fileName);
        if (!samplesOut.is_open())
                return false;

        for (it = samples.begin(); it != it_end; ++ it)
        {
                VssRay *ray = *it;
                int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;               
                int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;       

                samplesOut << ray->GetOrigin().x << " " << ray->GetOrigin().y << " " << ray->GetOrigin().z << " " 
                                   << ray->GetTermination().x << " " << ray->GetTermination().y << " " << ray->GetTermination().z << " " 
                                   << sourceid << " " << termid << "\n";
        }
#else
        ofstream samplesOut(fileName, ios::binary);
        if (!samplesOut.is_open())
                return false;

        for (it = samples.begin(); it != it_end; ++ it)
        {       
                VssRay *ray = *it;
                Vector3 origin(ray->GetOrigin());
                Vector3 termination(ray->GetTermination());
                
                int sourceid = ray->mOriginObject ? ray->mOriginObject->mId : -1;               
                int termid = ray->mTerminationObject ? ray->mTerminationObject->mId : -1;               

                samplesOut.write(reinterpret_cast<char *>(&origin), sizeof(Vector3));
                samplesOut.write(reinterpret_cast<char *>(&termination), sizeof(Vector3));
                samplesOut.write(reinterpret_cast<char *>(&sourceid), sizeof(int));
                samplesOut.write(reinterpret_cast<char *>(&termid), sizeof(int));
    }
#endif
        samplesOut.close();

        return true;
}


int
Preprocessor::GenerateRays(const int number,
                                                   SamplingStrategy &strategy,
                                                   SimpleRayContainer &rays)
{
  return strategy.GenerateSamples(number, rays);
}


int
Preprocessor::GenerateRays(const int number,
                                                   const int sampleType,
                                                   SimpleRayContainer &rays)
{
        const int startSize = (int)rays.size();
        SamplingStrategy *strategy = GenerateSamplingStrategy(sampleType);
        int castRays = 0;

        if (!strategy)
        {
                return 0;
        }

#if 1
        castRays = strategy->GenerateSamples(number, rays);
#else
        GenerateRayBundle(rays, newRay, 16, 0);
        castRays += 16;
#endif

        delete strategy;
        return castRays;
}


SamplingStrategy *Preprocessor::GenerateSamplingStrategy(const int strategyId)
{
        switch (strategyId)
        {
        case SamplingStrategy::OBJECT_BASED_DISTRIBUTION: 
                return new ObjectBasedDistribution(*this);
        case SamplingStrategy::OBJECT_DIRECTION_BASED_DISTRIBUTION:
                return new ObjectDirectionBasedDistribution(*this);
        case SamplingStrategy::DIRECTION_BASED_DISTRIBUTION:
                return new DirectionBasedDistribution(*this);
        case SamplingStrategy::DIRECTION_BOX_BASED_DISTRIBUTION: 
                return new DirectionBoxBasedDistribution(*this);
        case SamplingStrategy::SPATIAL_BOX_BASED_DISTRIBUTION:
                return new SpatialBoxBasedDistribution(*this);
        case SamplingStrategy::REVERSE_OBJECT_BASED_DISTRIBUTION:
                return new ReverseObjectBasedDistribution(*this);
        case SamplingStrategy::VIEWCELL_BORDER_BASED_DISTRIBUTION:
                return new ViewCellBorderBasedDistribution(*this);
        case SamplingStrategy::VIEWSPACE_BORDER_BASED_DISTRIBUTION:
                return new ViewSpaceBorderBasedDistribution(*this);
        case SamplingStrategy::REVERSE_VIEWSPACE_BORDER_BASED_DISTRIBUTION:
                return new ReverseViewSpaceBorderBasedDistribution(*this);
        case SamplingStrategy::GLOBAL_LINES_DISTRIBUTION:
                return new GlobalLinesDistribution(*this);
                
                //case OBJECTS_INTERIOR_DISTRIBUTION:
                //      return new ObjectsInteriorDistribution(*this);
        default: // no valid strategy
                Debug << "warning: no valid sampling strategy" << endl;
                return NULL;
        }

        return NULL; // should never come here
}


bool Preprocessor::LoadInternKdTree( const string internKdTree)
{
        // always try to load the kd tree
        cout << "loading kd tree file " << internKdTree << " ... " << endl;

        if (!LoadKdTree(internKdTree))
        {
                cout << "error loading kd tree with filename " 
                         << internKdTree << ", rebuilding it instead ... " << endl;
                // build new kd tree from scene geometry
                BuildKdTree();

                // export kd tree?
                const long startTime = GetTime();
                cout << "exporting kd tree ... ";

                if (!ExportKdTree(internKdTree))
                {
                        cout << " error exporting kd tree with filename " 
                                 << internKdTree << endl;
                }
                else
                {
                        cout << "finished in " 
                                 << TimeDiff(startTime, GetTime()) * 1e-3 
                                 << " secs" << endl;
                }
        }
        
        KdTreeStatistics(cout);
        cout << mKdTree->GetBox() << endl;

        return true;
}


bool Preprocessor::InitRayCast(const string externKdTree, 
                                                           const string internKdTree)
{
        // always try to load the kd tree
/*      cout << "loading kd tree file " << internKdTree << " ... " << endl;

        if (!LoadKdTree(internKdTree))
        {
                cout << "error loading kd tree with filename " 
                         << internKdTree << ", rebuilding it instead ... " << endl;
                // build new kd tree from scene geometry
                BuildKdTree();

                // export kd tree?
                const long startTime = GetTime();
                cout << "exporting kd tree ... ";

                if (!ExportKdTree(internKdTree))
                {
                        cout << " error exporting kd tree with filename " 
                                 << internKdTree << endl;
                }
                else
                {
                        cout << "finished in " 
                                 << TimeDiff(startTime, GetTime()) * 1e-3 
                                 << " secs" << endl;
                }
        }
        
        KdTreeStatistics(cout);
        cout << mKdTree->GetBox() << endl;
*/
        int rayCastMethod;
        Environment::GetSingleton()->
                GetIntValue("Preprocessor.rayCastMethod", rayCastMethod);

        if (rayCastMethod == 0)
        {
                cout << "ray cast method: internal" << endl;
                mRayCaster = new InternalRayCaster(*this);
        }
        else
        {
#ifdef GTP_INTERNAL
          cout << "ray cast method: intel" << endl;
          mRayCaster = new IntelRayCaster(*this, externKdTree);
#endif
        }
        
        mRayCaster->ReserveVssRayPool(2*mSamplesPerPass);
        
        return true;
}


void
Preprocessor::CastRays(
                                           SimpleRayContainer &rays,
                                           VssRayContainer &vssRays,
                                           const bool castDoubleRays,
                                           const bool pruneInvalidRays
                                           )
{
  const long t1 = GetTime();

#if 1
  mRayCaster->SortRays(rays);
  cout<<"Rays sorted in "<<TimeDiff(t1, GetTime())<<" ms."<<endl;

  if (0) {
        VssRayContainer tmpRays;
        int m = 50000;
        for (int i=m; i < m+20; i++) {
          tmpRays.push_back(new VssRay(rays[i].mOrigin,
                                                                   rays[i].mOrigin + 100.0f*rays[i].mDirection,
                                                                   NULL,
                                                                   NULL
                                                                   )
                                                );
          
        }
        ExportRays("sorted_rays.x3d", tmpRays, 200);
  }
#endif
  
        SimpleRayContainer::const_iterator rit, rit_end = rays.end();

        SimpleRayContainer rayBucket;
        int i = 0;
        for (rit = rays.begin(); rit != rit_end; ++ rit, ++ i)
        {
                SimpleRay ray = *rit;
#ifdef USE_CG
                // HACK: global lines must be treated special
                if (ray.mDistribution == SamplingStrategy::HW_GLOBAL_LINES_DISTRIBUTION)
                {
                        mGlobalLinesRenderer->CastGlobalLines(ray, vssRays);
                        continue;
                }
#endif
                rayBucket.push_back(ray);

                // 16 rays gathered => do ray casting
                if ((int)rayBucket.size() >= 16)
                {
                        mRayCaster->CastRays16(
                                                                   rayBucket,                           
                                                                   vssRays,
                                                                   mViewCellsManager->GetViewSpaceBox(),
                                                                   castDoubleRays,
                                                                   pruneInvalidRays);

                        rayBucket.clear();
                }
        
                if ((int)rays.size() > 10000 && i % 10000 == 0)
                  cout<<"\r"<<i<<"/"<<(int)rays.size()<<"\r";
        }
    
        // cast rest of rays
        SimpleRayContainer::const_iterator sit, sit_end = rayBucket.end();

        for (sit = rayBucket.begin(); sit != sit_end; ++ sit)
        {
                SimpleRay ray = *sit;

#ifdef USE_CG
                // HACK: global lines must be treated special
                if (ray.mDistribution == SamplingStrategy::HW_GLOBAL_LINES_DISTRIBUTION)
                {
                        mGlobalLinesRenderer->CastGlobalLines(ray, vssRays);
                        continue;
                }
#endif
                mRayCaster->CastRay(
                                                        ray,
                                                        vssRays,
                                                        mViewCellsManager->GetViewSpaceBox(),
                                                        castDoubleRays,
                                                        pruneInvalidRays);
                
        }

        if ((int)rays.size() > 10000) 
        {
                cout << endl;
        long t2 = GetTime();

#if SHOW_RAYCAST_TIMING
                if (castDoubleRays)
                        cout << 2 * rays.size() / (1e3f * TimeDiff(t1, t2)) << "M rays/s" << endl;
                else
                        cout << rays.size() / (1e3f * TimeDiff(t1, t2)) << "M rays/s" << endl;
#endif
        }
}


bool Preprocessor::GenerateRayBundle(SimpleRayContainer &rayBundle,                                                                     
                                                                         const SimpleRay &mainRay,
                                                                         const int number,
                                                                         const int pertubType) const
{
        rayBundle.push_back(mainRay);

        const float pertubOrigin = 0.0f;
        const float pertubDir = 0.2f;

        for (int i = 0; i < number - 1; ++ i)
        {
                Vector3 pertub;

                pertub.x = RandomValue(0.0f, pertubDir);
                pertub.y = RandomValue(0.0f, pertubDir);
                pertub.z = RandomValue(0.0f, pertubDir);

                const Vector3 newDir = mainRay.mDirection + pertub;
                //const Vector3 newDir = mainRay.mDirection;

                pertub.x = RandomValue(0.0f, pertubOrigin);
                pertub.y = RandomValue(0.0f, pertubOrigin);
                pertub.z = RandomValue(0.0f, pertubOrigin);

                const Vector3 newOrigin = mainRay.mOrigin + pertub;
                //const Vector3 newOrigin = mainRay.mOrigin;

                rayBundle.push_back(SimpleRay(newOrigin, newDir, 0, 1.0f));
        }

        return true;
}


void Preprocessor::SetupRay(Ray &ray,
                                                        const Vector3 &point,
                                                        const Vector3 &direction) const
{
        ray.Clear();
        // do not store anything else then intersections at the ray
        ray.Init(point, direction, Ray::LOCAL_RAY);     
}


void Preprocessor::EvalViewCellHistogram()
{
        char filename[256];
        Environment::GetSingleton()->GetStringValue("Preprocessor.histogram.file", filename);
  
        // mViewCellsManager->EvalViewCellHistogram(filename, 1000000);
        mViewCellsManager->EvalViewCellHistogramForPvsSize(filename, 1000000);
}


bool
Preprocessor::ExportRays(const char *filename,
                                                 const VssRayContainer &vssRays,
                                                 const int number,
                                                 const bool exportScene
                                                 )
{
  cout<<"Exporting vss rays..."<<endl<<flush;
  
  Exporter *exporter = NULL;
  exporter = Exporter::GetExporter(filename);

  if (0) {
        exporter->SetWireframe();
        exporter->ExportKdTree(*mKdTree);
  }
  
  exporter->SetFilled();
  // $$JB temporarily do not export the scene
  if (exportScene)
        exporter->ExportScene(mSceneGraph->GetRoot());

  exporter->SetWireframe();

  if (1) {
        exporter->SetForcedMaterial(RgbColor(1,0,1));
        exporter->ExportBox(mViewCellsManager->GetViewSpaceBox());
        exporter->ResetForcedMaterial();
  }
  
  VssRayContainer rays;
  vssRays.SelectRays(number, rays);
  exporter->ExportRays(rays, RgbColor(1, 0, 0));
  delete exporter;
  cout<<"done."<<endl<<flush;

  return true;
}

bool
Preprocessor::ExportRayAnimation(const char *filename,
                                                                 const vector<VssRayContainer> &vssRays
                                                                 )
{
  cout<<"Exporting vss rays..."<<endl<<flush;
        
  Exporter *exporter = NULL;
  exporter = Exporter::GetExporter(filename);
  if (0) {
        exporter->SetWireframe();
        exporter->ExportKdTree(*mKdTree);
  }
  exporter->SetFilled();
  // $$JB temporarily do not export the scene
  if (0)
        exporter->ExportScene(mSceneGraph->GetRoot());
  exporter->SetWireframe();

  if (1) {
        exporter->SetForcedMaterial(RgbColor(1,0,1));
        exporter->ExportBox(mViewCellsManager->GetViewSpaceBox());
        exporter->ResetForcedMaterial();
  }
  
  exporter->ExportRaySets(vssRays, RgbColor(1, 0, 0));
        
  delete exporter;

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

  return true;
}

void
Preprocessor::ComputeRenderError()
{
  // compute rendering error
        
  if (renderer && renderer->mPvsStatFrames) {
        //      emit EvalPvsStat();
        //      QMutex mutex;
        //      mutex.lock();
        //      renderer->mRenderingFinished.wait(&mutex);
        //      mutex.unlock();
        
        renderer->EvalPvsStat();

        mStats <<
          "#AvgPvsRenderError\n" <<renderer->mPvsStat.GetAvgError()<<endl<<
          "#AvgPixelError\n" <<renderer->GetAvgPixelError()<<endl<<
          "#MaxPixelError\n" <<renderer->GetMaxPixelError()<<endl<<
          "#MaxPvsRenderError\n" <<renderer->mPvsStat.GetMaxError()<<endl<<
          "#ErrorFreeFrames\n" <<renderer->mPvsStat.GetErrorFreeFrames()<<endl<<
          "#AvgRenderPvs\n" <<renderer->mPvsStat.GetAvgPvs()<<endl;
  }
}


Intersectable *Preprocessor::GetObjectById(const int id)
{
#if 1
        // create a dummy mesh instance to be able to use stl
        MeshInstance object(NULL);
        object.SetId(id);

        ObjectContainer::const_iterator oit =
                lower_bound(mObjects.begin(), mObjects.end(), &object, ilt);
                                
        // objects sorted by id
        if ((oit != mObjects.end()) && ((*oit)->GetId() == object.GetId()))
        {
                return (*oit);
        }
        else
        {
                return NULL;
        }
#else
        return mObjects[id - 1];
#endif
}


void Preprocessor::PrepareHwGlobalLines()
{
        int texHeight, texWidth;
        float eps;
        int maxDepth;
        bool sampleReverse;

        Environment::GetSingleton()->GetIntValue("Preprocessor.HwGlobalLines.texHeight", texHeight);
        Environment::GetSingleton()->GetIntValue("Preprocessor.HwGlobalLines.texWidth", texWidth);
        Environment::GetSingleton()->GetFloatValue("Preprocessor.HwGlobalLines.stepSize", eps);
        Environment::GetSingleton()->GetIntValue("Preprocessor.HwGlobalLines.maxDepth", maxDepth);
        Environment::GetSingleton()->GetBoolValue("Preprocessor.HwGlobalLines.sampleReverse", sampleReverse);

        Debug << "****** hw global line options *******" << endl;
        Debug << "texWidth: " << texWidth << endl;
        Debug << "texHeight: " << texHeight << endl;
        Debug << "sampleReverse: " << sampleReverse << endl;
        Debug << "max depth: " << maxDepth << endl;
        Debug << "step size: " << eps << endl;
        Debug << endl;

#ifdef USE_CG
        globalLinesRenderer = mGlobalLinesRenderer = 
                new GlobalLinesRenderer(this,
                                                                texHeight,
                                                                texWidth,
                                                                eps,
                                                                maxDepth,
                                                                sampleReverse);

        mGlobalLinesRenderer->InitGl();

#endif
}

}