Triangle.h

#ifndef TRIANGLE_H
#define TRIANGLE_H


/*
** ---------------------------------------------------------------
** Includes:
*/
#include <vector>
#include "geom.h"
#include "ray.h"
#include "lang.h"

/*
** ---------------------------------------------------------------
** Definitions:
*/


typedef vector<Triangle *>TriangleArray;


class Triangle : Polygon {

private :


public:

        Triangle();

        Triangle (const Vector3 &v0,const Vector3  &v1,const Vector3  &v2);

        static Polygon decode(Pval *plist);

        virtual Vector4 plane();

        virtual Real area();


};

ofstream & operator<<(ofstream &out,const Triangle &tri);
ifstream & operator>>(ifstream &in,const Triangle &tri); 

inline
Triangle::Triangle()
        : Polygon(3)
{
}


inline
Triangle::Triangle(const Vector3 &v0,const Vector3  &v1,const Vector3  &v2)
        : Polygon(3)
{
        vertices(0) = v0;
        vertices(1) = v1;
        vertices(2) = v2; 
}

inline Vector4 
Triangle::plane()
{
  Vector3 n = normal();
  Real d = -(n*vertices[0]);
  return Vector4(n(0), n(1), n(2), d);
}

inline Real 
Triangle::area()
{
  return (vertices(1) - vertices(0)).cross(vertices(2) - vertices(0)).norm()/2;
}


#endif //TRIANGLE_H

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