grass_triangle_collector.h

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#ifndef GRASS_TRIANGLE_COLLECTOR_H
#define GRASS_TRIANGLE_COLLECTOR_H

#include <osg/TriangleFunctor>
#include <osg/Vec3>
#include <map>
#include <vector>

#include "grass_mesh.h"

using namespace std;
using namespace osg;

namespace grass
{


  

  // collects triangles od osg::Drawable and computes very interesting things
  // like normals and area of those triangles.
  class TriangleCollector
  {
  public:
    // this should be called for every triangle
    void operator() (const osg::Vec3 v1, const osg::Vec3 v2, const osg::Vec3 v3, bool treatVertexDataAsTemporary);
  
    // returns mesh with all accesible triangles of given Geode
    static Mesh * GetMesh(const Geode & geode, const float maxGrassHeight);
  private:
    Mesh * FinalizeAndReturn(const float maxGrassHeight);

    map<Vec3, unsigned int> verticesLookup;   // key is a positon, value is its index
    vector<Vec3> vertices;
    vector<unsigned int> triangles;

    // returns index of vertex
    unsigned int AddVertex(const Vec3 & v);
  };

  


}; // end of namespace grass


#endif // GRASS_TRIANGLE_COLLECTOR_H