// Wild Magic Source Code
// David Eberly
// http://www.geometrictools.com
// Copyright (c) 1998-2007
//
// 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
// the Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.  The license is available for reading at
// either of the locations:
//     http://www.gnu.org/copyleft/lgpl.html
//     http://www.geometrictools.com/License/WildMagicLicense.pdf
//
// Version: 4.0.0 (2006/06/28)

#ifndef PHYSICSMODULE_H
#define PHYSICSMODULE_H

#include "Wm4MassSpringArbitrary.h"

class PhysicsModule : public Wm4::MassSpringArbitrary3f
{
public:
    // construction and destruction
    PhysicsModule (int iNumParticles, int iNumSteps, float fStep,
        float fViscosity);

    virtual ~PhysicsModule ();

    // external acceleration is due to viscous forces
    virtual Wm4::Vector3f ExternalAcceleration (int i, float fTime,
        const Wm4::Vector3f* akPosition, const Wm4::Vector3f* akVelocity);

protected:
    float m_fViscosity;
};

#endif
