scene.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 Color3 &Scene::GetBackgroundColor() const {
    return m_background_color;
}

inline
const IObject *Scene::GetRootObject() const {
    return m_root_object;
}

inline
void Scene::SetAmbientIllumination(const Color3 &ambient) {
    m_ambient = ambient;
}

inline
const Color3 &Scene::GetAmbientIllumination() const {
    return m_ambient;
}

inline
int Scene::GetLightCount() const {
    return static_cast<int>(m_lights.size());
}

inline
const ILight *Scene::GetLight(int i) const {
    assert(i >= 0 && i < GetLightCount());
    return m_lights[i];
}

inline
bool Scene::Trace(const Context &context, const Ray &ray, Hit *hit /*= 0*/) const {
    assert(m_root_object);

    const bool result = m_root_object->Intersect(context, ray, hit);

    // Make sure that if there is an intersection, it is a true intersection.
    assert(!result || (result && hit->m_abscissa > 1.0e-8));
    
    return result;
}

inline
bool Scene::ArePointsMutuallyVisible(const Context &context,
                                     const sheep::Point3 &origin,
                                     const sheep::Vector3 &origin_normal,
                                     const sheep::Point3 &goal,
                                     Ray::Type ray_type /*= Ray::VISIBILITY_RAY*/) const
{
    assert(m_root_object);
    assert(origin_normal.IsUnitLength());

    // Visibility evaluation rays will try to reach a point that is slighty shifted
    // along the geometric normal to the surface at the point of origin. This is
    // necessary to avoid false intersections.
    const sheep::Point3 shifted_origin = origin + 1.0e-8 * origin_normal;

    const Ray ray(ray_type, shifted_origin, goal - shifted_origin);
    Hit hit;

    if(m_root_object->Intersect(context, ray, &hit)) {
        // Make sure this is a true intersection.
        assert(hit.m_abscissa > 1.0e-8);

        return hit.m_abscissa > 1.0 - 1.0e-8;
    } else return true;
}

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