catmullromcurve3.cpp

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/*
    Sheep - A Rigid Body Dynamics Engine
    Copyright (C) 2001-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of Sheep.

    Sheep is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Sheep is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Sheep; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "catmullromcurve3.h"   // include first

using namespace sheep;

CatmullRomCurve3::CatmullRomCurve3(const Vector3 p[4]) {
    assert(p);

    m_c[3] = 0.5 * (-p[0] + 3.0 * p[1] - 3.0 * p[2] + p[3]);
    m_c[2] = 0.5 * (2.0 * p[0] - 5.0 * p[1] + 4.0 * p[2] - p[3]);
    m_c[1] = 0.5 * (-p[0] + p[2]);
    m_c[0] = 0.5 * (2.0 * p[1]);

    m_c2[0] = 3.0 * m_c[3];
    m_c2[1] = 2.0 * m_c[2];
}

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