ray_3d_simple_polygon_3d.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2011 the Initial Developer.
 *  All Rights Reserved.
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 *  GNU General Public License Version 2 or later (the GPL), in which case the 
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 */
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_RAY_3D_SIMPLE_POLYGON_3D_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_RAY_3D_SIMPLE_POLYGON_3D_H
 
#include "prim_common.h"
#include "ray_3d.h"
#include "simple_polygon_3d.h"
 
namespace lass
{
namespace prim
{
 
/** Find the intersection of a ray and a simple polygon by their parameter t on the ray.
 *  @relates lass::prim::Ray3D
 *  @relates lass::prim::SimplePolygon3D
 *
 *  @param polygon [in] the simple polygon
 *  @param triangle [in] the ray
 *  @param t [out] the parameter of the intersection point > @a tMin.
 *  @param tMin [in] the minimum t that may be returned as valid intersection.
 *  @return @arg rNone      no intersections with @a t > @a tMin found
 *                          @a t is not assigned.
 *          @arg rOne       a intersection with @a t > @a tMin is found
 *                          @a t is assigned.
 */
template<typename T, class EP1, class NP1, class NP2, class PP2>
Result intersect(
        const SimplePolygon3D<T, EP1, NP1>& polygon, const Ray3D<T, NP2, PP2>& triangle, 
        T& t, const T& tMin)
{
    typedef Point2D<T> TPoint;
    typedef typename TPoint::TValue TValue;
 
    TValue tCandidate;
    if (intersect(polygon.plane(), triangle, tCandidate, tMin) == rOne)
    {
        if (polygon.contains(triangle.point(tCandidate)))
        {
            t = tCandidate;
            return rOne;
        }
    }
    return rNone;
}
 
}
}
 
#endif
 
// EOF