GteDistRay3AlignedBox3.h

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// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2017
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
// File Version: 3.0.0 (2016/06/19)

#pragma once

#include <Mathematics/GteDistLine3AlignedBox3.h>
#include <Mathematics/GteRay.h>

namespace gte
{

template <typename Real>
class DCPQuery<Real, Ray3<Real>, AlignedBox3<Real>>
{
public:
    struct Result
    {
        Real distance, sqrDistance;
        Real rayParameter;
        Vector3<Real> closestPoint[2];
    };

    Result operator()(Ray3<Real> const& ray, AlignedBox3<Real> const& box);
};


template <typename Real>
typename DCPQuery<Real, Ray3<Real>, AlignedBox3<Real>>::Result
DCPQuery<Real, Ray3<Real>, AlignedBox3<Real >> ::operator()(
    Ray3<Real> const& ray, AlignedBox3<Real> const& box)
{
    Result result;

    Line3<Real> line(ray.origin, ray.direction);
    DCPQuery<Real, Line3<Real>, AlignedBox3<Real>> lbQuery;
    auto lbResult = lbQuery(line, box);

    if (lbResult.lineParameter >= (Real)0)
    {
        result.sqrDistance = lbResult.sqrDistance;
        result.distance = lbResult.distance;
        result.rayParameter = lbResult.lineParameter;
        result.closestPoint[0] = lbResult.closestPoint[0];
        result.closestPoint[1] = lbResult.closestPoint[1];
    }
    else
    {
        DCPQuery<Real, Vector3<Real>, AlignedBox3<Real>> pbQuery;
        auto pbResult = pbQuery(ray.origin, box);
        result.sqrDistance = pbResult.sqrDistance;
        result.distance = pbResult.distance;
        result.rayParameter = (Real)0;
        result.closestPoint[0] = ray.origin;
        result.closestPoint[1] = pbResult.boxClosest;
    }
    return result;
}


}