intersection.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once
#ifndef LIB_LIGHTMETRICA_INTERSECTION_H
#define LIB_LIGHTMETRICA_INTERSECTION_H

#include "common.h"
#include "surfacegeometry.h"

LM_NAMESPACE_BEGIN

struct Primitive;
class Camera;
class Light;

struct Intersection
{

    // Primitive and reference to the triangle
    const Primitive* primitive;
    unsigned int primitiveIndex;
    unsigned int triangleIndex;

    // Emitters associated with intersected surface
    // Thought this is duplicated with #light and #camera variable in #primitive,
    // these variables are introduced in order to support emitters which are
    // not associated with the #primitive such as environment light.
    // TODO : Use unrestricted unions
    const Camera* camera;
    const Light* light;

    // Surface geometry information
    SurfaceGeometry geom;

};

LM_NAMESPACE_END

#endif // LIB_LIGHTMETRICA_INTERSECTION_H