BalloonMesh.cpp

/***************************************************************************
 *   This file is part of OpenCAL: Open Computer Animation Library         *
 *   I created OpenCAL as my master's thesis Computer Science (multimedia) *
 *   at the tUL university in Diepenbeek, Belgium                          *
 *                                                                         *
 *   Copyright (C) 2003-2004 by Jeroen Dierckx                             *
 *   jeroen.dierckx@student.luc.ac.be                                      *
 *                                                                         *
 ***************************************************************************/

// Includes
#include "BalloonMesh.h"
#include <OpenCAL/PointMass.h>
#include <OpenCAL/Spring.h>
#include <OpenCAL/System.h>
#include <OpenCAL/Vertex.h>
#include <OpenCAL/Triangle.h>
#include <OpenCAL/PressureForce.h>
using namespace OpenCAL;

#include <OpenCAL/Vector3.h>
#include <OpenCAL/Material.h>
using namespace Utils;

using namespace std;


/******************************
* Constructors and destructor *
******************************/

BalloonMesh::BalloonMesh(System *parent, const string &filename, const Vector3 &position)
: MassSpringSystem(parent), m_filename(filename)
{
    constructMesh(position);
    new PressureForce(this);
}

BalloonMesh::~BalloonMesh()
{
}


/************************
* Get and set functions *
************************/


/******************
* Other functions *
******************/

/*
#ifdef USE_OPENGL
void BalloonMesh::drawGL()
{
    MassSpringSystem::drawGL();

    //if(!m_draw) return;

    glLineWidth(1.0f);

    //m_surface.invalidateTriangleNormals();
    //m_surface.calculateVertexNormals();
    m_surface.drawGL();
}
#endif // USE_OPENGL
*/


/**********************
* Protected functions *
**********************/

void BalloonMesh::constructMesh(const Vector3 &position)
{
    const float stiffness = 0.1f;
    const float damping = 0.005f;
    const float mass = 0.1f; // Mass of the mesh
    float massEach = 1.0f;

    unsigned int i = 0;
    PointMass *point;
    Vertex *vertex;
    Triangle *triangle;


    // Load the triangle mesh
    m_surface.loadFromFile(m_filename);
    if(m_surface.numVertices() > 0)
        massEach= mass / m_surface.numVertices();


    /*********
    * Points *
    *********/

    for(i = 0; i < m_surface.numVertices(); ++i)
    {
        vertex = m_surface.getVertex(i);
        point = new PointMass(this, massEach);
        point->setPosition(vertex->getPosition() + position);
        vertex->linkPosition(point->getPositionP());
        m_connections[vertex] = point;
    }


    /**********
    * Springs *
    **********/

    for(i = 0; i < m_surface.numTriangles(); ++i)
    {
        triangle = m_surface.getTriangle(i);
        addSprings(triangle, stiffness, damping);
    }

    m_springConnections.clear();
}

void BalloonMesh::addSprings(Triangle *triangle, float stiffness, float damping)
{
    Vertex *v1 = triangle->getVertex(0);
    Vertex *v2 = triangle->getVertex(1);
    Vertex *v3 = triangle->getVertex(2);
    Spring *spring;

    if(!isConnected(v1, v2))
    {
        spring = new Spring(this, m_connections[v1], m_connections[v2]);
        spring->setStiffness(stiffness);
        spring->setDamping(damping);
        m_springConnections[v1] = v2;
    }

    if(!isConnected(v2, v3))
    {
        spring = new Spring(this, m_connections[v2], m_connections[v3]);
        spring->setStiffness(stiffness);
        spring->setDamping(damping);
        m_springConnections[v2] = v3;
    }

    if(!isConnected(v3, v1))
    {
        spring = new Spring(this, m_connections[v3], m_connections[v1]);
        spring->setStiffness(stiffness);
        spring->setDamping(damping);
        m_springConnections[v3] = v1;
    }
}

bool BalloonMesh::isConnected(Vertex *v1, Vertex *v2)
{
    SpringMap::iterator it;

    it = m_springConnections.find(v1);
    if(it != m_springConnections.end() && it->second == v2)
        return true;

    it = m_springConnections.find(v2);
    if(it != m_springConnections.end() && it->second == v1)
        return true;

    return false;
}

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