source: GTP/trunk/Lib/Vis/Preprocessing/src/UnigraphicsParser.cpp @ 1627

#include  <stdlib.h>
#include <iostream>
#include <list>
#include <map>
using namespace std;

#include "Vector3.h"
#include "Mesh.h"
#include "SceneGraph.h"

#include "UnigraphicsParser.h"
#include "Material.h"
#include "Environment.h"
#include "ResourceManager.h"
#include "Triangle3.h"
#include "IntersectableWrapper.h"
#include "Polygon3.h"


namespace GtpVisibilityPreprocessor {

#define ROTATE_SCENE 0
// HACK
static void RotateMesh(Mesh *mesh)
{
        VertexContainer::iterator it, it_end = mesh->mVertices.end();

        const float angle = 30.0f * PI / 180.0f;
        const Matrix4x4 rot = RotationYMatrix(angle);

        for (it = mesh->mVertices.begin(); it != it_end; ++ it)
        {
                (*it) = rot * (*it);        
        }
}


struct ltstr
{
  bool operator()(const string s1, const string s2) const
  {
    return s1 < s2;
  }
};

bool
UnigraphicsParser::ParseFile(const string filename,
                                                         SceneGraphNode *root,
                                                         const bool loadMeshes,
                                                         vector<FaceParentInfo> *parents)
{
  map<string, Vector3, ltstr> vht; // hash table for vectors
  map<string, Vector3, ltstr> cht; // hash table for colors
  
  FILE *file;
  char str[80];
  Face *face;
    
  float x,y,z;
  //int i;
  
  if ((file = fopen(filename.c_str(),"rt")) == NULL)
    return false;

  int meshGrouping;
  Environment::GetSingleton()->GetIntValue("Unigraphics.meshGrouping",
                           meshGrouping);

  Mesh *currentMesh = MeshManager::GetSingleton()->CreateResource();

  while(fscanf(file,"%s",str)!=EOF) 
  {
          switch (str[0]) 
          {
          case 'c':
                  if (strcmp(str,"c_rgb")==0)
                  {
                          cout<<"c";
                          cout.flush();
                          // vertex
                          fscanf(file,"%s",str); // label
                          fscanf(file,"%f %f %f",&x,&y,&z);

                          cht[str] = Vector3(x,y,z); // swap the file coordinates
                  }
                  break;

          case 'v':            // is it v ?
                  cout<<".";
                  cout.flush();
                  // vertex
                  fscanf(file,"%s",str); // label
                  fscanf(file,"%f %f %f",&x,&y,&z);

                  vht[str] = Vector3(x,z,-y); // swap the file coordinates
                  // vptr = new Vector3C(x,y,z); // swap the file coordinates
                  break;

          case 'f': 
                  {
                          cout << "+";
                          VertexContainer vertices;
                          VertexIndexContainer vertexIndices;

                          // face
                          fscanf(file,"%s",str); // label may  be ?
                          if (str[0]!='(')
                                  fscanf(file,"%s",str);

                           map<string, Vector3, ltstr>::const_iterator c = vht.find(&str[1]);

                          if (c == vht.end()) 
                          {
                                  cout<<"error reading file : "<< filename 
                                          <<" ---missing vertex:"<<str<<endl; exit(1);
                          }

                          vertices.push_back((*c).second);

                          fscanf(file,"%s",str); // get the vertex label

                          while(str[0]!=')') 
                          {
                                  c = vht.find(str);
                                  if (c == vht.end())
                                  {
                                        cout << "error reading file : " << filename << " -- missing vertex\n";
                                        exit(1);  
                                }

                                vertices.push_back((*c).second);
                                fscanf(file,"%s",str); // get the next vertex label
                        }

                        // add vertices to the mesh vertex list
                        int index = (int)currentMesh->mVertices.size();

                        for (int i=0; i < (int)vertices.size(); ++ i, ++ index) 
                        {
                                currentMesh->mVertices.push_back(vertices[i]);
                                vertexIndices.push_back(index);
                        }

                        face = new Face(vertexIndices);

                        fscanf(file,"%s",str);   // get the next vertex label

                        if (str[0]!=';') 
                        {
                                c = cht.find(str);
                                if (currentMesh->mMaterial == NULL) 
                                {
                                        Material *mat = MaterialManager::GetSingleton()->CreateResource();
                                        if (c != cht.end()) 
                                        {
                                                mat->mDiffuseColor = RgbColor((*c).second.x, (*c).second.y, (*c).second.z);
                                                currentMesh->mMaterial = mat;
                                        }
                                        else
                                        {
                                                currentMesh->AssignRandomMaterial();
                                        }
                                }
                        }

                        currentMesh->AddFace(face);

                        if (loadMeshes &&
                                (meshGrouping != 0 && currentMesh->mFaces.size() >=  meshGrouping)) 
                        {
                                if (ROTATE_SCENE)
                                {
                                        RotateMesh(currentMesh);
                                }

                                currentMesh->Preprocess();
                                // make an instance of this mesh
                                MeshInstance *mi = new MeshInstance(currentMesh);
                                root->mGeometry.push_back(mi);  
                                currentMesh = MeshManager::GetSingleton()->CreateResource();
                        }
                  }
                break;
        }      /* end face */

        // get the rest of the line
        fgets(str,80,file);
  }

  if (!currentMesh->mVertices.empty()) 
  {
          if (ROTATE_SCENE) 
          {
                  RotateMesh(currentMesh);
          }

          if (!loadMeshes)
          {
                  // hack: just triangulate current mesh
                  FaceContainer::const_iterator fit, fit_begin = currentMesh->mFaces.begin(), 
                          fit_end = currentMesh->mFaces.end();

                  for (fit = fit_begin; fit != fit_end; ++ fit)
                  {
                          // triangulate the faces
                          Face *face = *fit;
                          vector<Triangle3> triangles;

                          Polygon3 poly(face, currentMesh);
                          poly.Triangulate(triangles);

                          vector<Triangle3>::const_iterator tit, tit_end = triangles.end();

                          for (tit = triangles.begin(); tit != tit_end; ++ tit)
                          {
                                  if ((*tit).CheckValidity())
                                  {
                                          // create new triangle intersectable
                                          TriangleIntersectable *ti = new TriangleIntersectable(*tit);
                                          //cout << "t: " << (*tit) << endl;
                                          root->mGeometry.push_back(ti);
                                  }
                                  else
                                  {
                                          cout << "error tri:\n" << (*tit) << endl;
                                  }
                          }
                  }
                  // not needed anymore
                  MeshManager::GetSingleton()->DestroyEntry(currentMesh->GetId());
          }
          else
          {
                  currentMesh->Preprocess();
                  MeshInstance *mi = new MeshInstance(currentMesh);
                  root->mGeometry.push_back(mi);
          }
  }

  fclose(file);
  return true;
}

}