iedf.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
sheep::Real IEDF::GetEmittedRadiance(const Context &context,
                                     const sheep::Vector3 &normal,
                                     const sheep::Vector3 &direction) const
{
    assert(normal.IsUnitLength());
    assert(direction.IsUnitLength());

    const sheep::Real cos_angle = normal * direction;

    if(cos_angle <= 0.0)
        return 0.0;

    SurfaceBasis surfacebasis(normal);

    const sheep::Real edf_value =
        Evaluate(context, surfacebasis.TransformToLocal(direction));

    return cos_angle * edf_value;
}

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