#ifndef ElasticityEnergy_H
#define ElasticityEnergy_H

/* Last edited on DATE TIME by USER */

#include <Energy.h>

typedef struct ElasticityEnergy_data_t 
{
  double alpha;     /* the two elastic moduli of the material, that*/
  double beta;      /* express its resistance to changes in volume */
} ElasticityEnergy_data_t;
  /* The {Elasticity} energy considers that every tetrahedral chip is done
    of any material like rubber (i.e. elastic) possesing property material
    uniformes inside of every tetrahedron, but with unequal propiertes
    between tetrahedra.

    This module compute the "elastic energy" of a tetrahedral element. 
    See the section 4.2 "Calculo das forcas de elasticidade" in the Msc.
    Thesis "Animacao Dinamica de Corpos Elasticos" by R.L.W.L for more
    details.
  */

Energy_t ElasticityEnergy_new(double alpha, double beta);
  
#endif