TriangularTensorMassForceField.h

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/******************************************************************************
*       SOFA, Simulation Open-Framework Architecture, version 1.0 beta 3      *
*                (c) 2006-2008 MGH, INRIA, USTL, UJF, CNRS                    *
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* This library is free software; you can redistribute it and/or modify it     *
* under the terms of the GNU Lesser General Public License as published by    *
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* for more details.                                                           *
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*******************************************************************************
*                               SOFA :: Modules                               *
*                                                                             *
* Authors: The SOFA Team and external contributors (see Authors.txt)          *
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* Contact information: contact@sofa-framework.org                             *
******************************************************************************/
#ifndef SOFA_COMPONENT_FORCEFIELD_TRIANGULARTENSORMASSFORCEFIELD_H
#define SOFA_COMPONENT_FORCEFIELD_TRIANGULARTENSORMASSFORCEFIELD_H

#if !defined(__GNUC__) || (__GNUC__ > 3 || (_GNUC__ == 3 && __GNUC_MINOR__ > 3))
#pragma once
#endif

#include <sofa/core/componentmodel/behavior/ForceField.h>
#include <sofa/core/componentmodel/topology/BaseMeshTopology.h>
#include <sofa/defaulttype/Vec.h>
#include <sofa/defaulttype/Mat.h>
#include <sofa/component/topology/TriangleData.h>
#include <sofa/component/topology/EdgeData.h>


namespace sofa
{

namespace component
{


namespace forcefield
{
using namespace sofa::helper;
using namespace sofa::defaulttype;
using namespace sofa::component::topology;


template<class DataTypes>
class TriangularTensorMassForceField : public core::componentmodel::behavior::ForceField<DataTypes>, public virtual core::objectmodel::BaseObject
{
public:
    typedef core::componentmodel::behavior::ForceField<DataTypes> Inherited;
    typedef typename DataTypes::VecCoord VecCoord;
    typedef typename DataTypes::VecDeriv VecDeriv;
    typedef typename DataTypes::Coord    Coord   ;
    typedef typename DataTypes::Deriv    Deriv   ;
    typedef typename Coord::value_type   Real    ;


    class Mat3 : public fixed_array<Deriv,3>
    {
    public:
        Deriv operator*(const Deriv& v)
        {
            return Deriv((*this)[0]*v,(*this)[1]*v,(*this)[2]*v);
        }
        Deriv transposeMultiply(const Deriv& v) 
        {
            return Deriv(v[0]*((*this)[0])[0]+v[1]*((*this)[1])[0]+v[2]*((*this)[2][0]),
                v[0]*((*this)[0][1])+v[1]*((*this)[1][1])+v[2]*((*this)[2][1]),
                v[0]*((*this)[0][2])+v[1]*((*this)[1][2])+v[2]*((*this)[2][2]));
        }
    };

protected: 


  class EdgeRestInformation
    {
    public:
        Mat3 DfDx; 

        EdgeRestInformation() {
        }
    };

    EdgeData<EdgeRestInformation> edgeInfo;
        
    sofa::core::componentmodel::topology::BaseMeshTopology* _topology;
    VecCoord  _initialPoints;

    bool updateMatrix;

    Data<Real> f_poissonRatio;
    Data<Real> f_youngModulus;

    Real lambda;  
    Real mu;    
public:

    TriangularTensorMassForceField();

    virtual ~TriangularTensorMassForceField();

    virtual double getPotentialEnergy(const VecCoord& x);

    virtual void init();
    virtual void addForce(VecDeriv& f, const VecCoord& x, const VecDeriv& v);
    virtual void addDForce(VecDeriv& df, const VecDeriv& dx);

    virtual Real getLambda() const { return lambda;}
    virtual Real getMu() const { return mu;}

    void setYoungModulus(const double modulus) {
        f_youngModulus.setValue((Real)modulus);
    }
    void setPoissonRatio(const double ratio) {
        f_poissonRatio.setValue((Real)ratio);
    }

    // handle topological changes
    virtual void handleTopologyChange();

    void draw();
    void updateLameCoefficients();



protected :

    EdgeData<EdgeRestInformation> &getEdgeInfo() {return edgeInfo;}

    static void TriangularTMEdgeCreationFunction(int edgeIndex, void* param, 
        EdgeRestInformation &ei,
        const Edge& ,  const sofa::helper::vector< unsigned int > &,
        const sofa::helper::vector< double >&);

    static void TriangularTMTriangleCreationFunction(const sofa::helper::vector<unsigned int> &triangleAdded, 
        void* param, vector<EdgeRestInformation> &edgeData);
    static void TriangularTMTriangleDestructionFunction ( const sofa::helper::vector<unsigned int> &triangleAdded, 
        void* param, vector<EdgeRestInformation> &edgeData);

};
} //namespace forcefield

} // namespace Components


} // namespace Sofa



#endif /* _TriangularTensorMassForceField_H_ */