disk_3d_ray_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) 2004-2022 the Initial Developer.
 *  All Rights Reserved.
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 *
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 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
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 *  deleting the provisions above and replace them with the notice and other 
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 *  
 *  *** END LICENSE INFORMATION ***
 */
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_DISK_3D_RAY_3D_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_DISK_3D_RAY_3D_H
 
#include "prim_common.h"
#include "disk_3d.h"
#include "ray_3d.h"
#include "../num/floating_point_consistency.h"
 
namespace lass
{
namespace prim
{
 
/** @relates lass::prim::Ray3D
 *  @relates lass::prim::Parallelogram3D
 */
template <typename T, class NP, class PP>
Result intersect(const Disk3D<T>& disk, const Ray3D<T, NP, PP>& ray, T& u, T& v, T& t, const T& tMin = T())
{
    typedef typename Disk3D<T>::TPlane TPlane;
    typedef typename Disk3D<T>::TVector TVector;
    typedef typename Disk3D<T>::TNumTraits TNumTraits;
 
    T tCandidate;
    const TPlane& plane = disk.plane();
    const Result result = intersect(plane, ray, tCandidate, tMin);
    if (result != rOne)
    {
        return result;
    }
 
    const TVector delta = ray.point(tCandidate) - disk.center();
    const T sqrDist = delta.squaredNorm();
    if (sqrDist > num::sqr(disk.radius()))
    {
        return rNone;
    }
 
    const T x = dot(delta, plane.directionU());
    const T y = dot(delta, plane.directionV());
    
    t = tCandidate;
    u = num::sqrt(sqrDist) / disk.radius();
    v = num::atan2(y, x) / (2 * TNumTraits::pi);
    if (v < 0)
    {
        v += TNumTraits::one;
    }
    return rOne;
}
 
/** @relates lass::prim::Ray3D
 *  @relates lass::prim::Parallelogram3D
 */
template <typename T, class NP, class PP>
Result intersect(const Disk3D<T>& disk, const Ray3D<T, NP, PP>& ray, T& t, const T& tMin = T())
{
    T u;
    T v;
    return intersect(disk, ray, u, v, t, tMin);
}
 
}
 
}
 
#endif
 
// EOF