square.inl

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/*
    toxic - A Global Illumination Renderer
    Copyright (C) 2003-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of toxic.

    toxic 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.

    toxic 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 toxic; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

inline
const sheep::AABB3 &Square::GetAABB() const {
    return m_aabb;
}

inline
sheep::Real Square::ComputeSurfaceArea() const {
    const sheep::Real ex_norm2 = m_ex.SquareNorm();
    const sheep::Vector3 h(m_ez - (m_ex * m_ez) * m_ex / ex_norm2);
    return sqrt(ex_norm2) * h.Norm();
}

inline
void Square::EvaluateSurface(const sheep::Point2 &input,
                             sheep::Point3 *point,
                             sheep::Vector3 *geometric_normal) const
{
    assert(point);
    assert(geometric_normal);

    *point =
        m_center +
        (input.m_x - 0.5) * m_ex +
        (input.m_y - 0.5) * m_ez;

    *geometric_normal = m_normal;
}

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