icamera.cpp

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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
*/

#include "icamera.h"    // include first

#include <cassert>
#include <cmath>

using namespace sheep;
using namespace toxic;

ICamera::ICamera(const Matrix4 &m, Real hfov, Real aspect_ratio) :
    Basis(m),
    m_location(TransformToWorld(Point3(0.0))),
    m_ex(TransformToWorld(Vector3(1.0, 0.0, 0.0))),
    m_ey(TransformToWorld(Vector3(0.0, 1.0, 0.0))),
    m_ez(TransformToWorld(Vector3(0.0, 0.0, 1.0))),
    m_hfov(hfov),
    m_aspect_ratio(aspect_ratio)
{
    assert(m_hfov > -PI && m_hfov < PI);

    m_focal_length = m_aspect_ratio / tan(0.5 * m_hfov);

    m_u = m_ex * m_aspect_ratio;
    m_w = m_ez * (-m_focal_length);
}

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