tetrees/Plugins/Wwise/Source/AkAudio/Classes/GTE/Mathematics/DistLine3OrientedBox3.h

// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2020
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
// https://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
// Version: 4.0.2019.08.13

#pragma once

#include <Mathematics/DistLine3AlignedBox3.h>
#include <Mathematics/Line.h>
#include <Mathematics/OrientedBox.h>

namespace WwiseGTE
{
    template <typename Real>
    class DCPQuery<Real, Line3<Real>, OrientedBox3<Real>>
        :
        public DCPQuery<Real, Line3<Real>, AlignedBox3<Real>>
    {
    public:
        struct Result
            :
            public DCPQuery<Real, Line3<Real>, AlignedBox3<Real>>::Result
        {
            // No additional information to compute.
        };

        Result operator()(Line3<Real> const& line, OrientedBox3<Real> const& box)
        {
            // Transform the line to the coordinate system of the oriented
            // box.  In this system, the box is axis-aligned with center at
            // the origin.
            Vector3<Real> diff = line.origin - box.center;
            Vector3<Real> point, direction;
            for (int i = 0; i < 3; ++i)
            {
                point[i] = Dot(diff, box.axis[i]);
                direction[i] = Dot(line.direction, box.axis[i]);
            }

            Result result;
            this->DoQuery(point, direction, box.extent, result);

            // Compute the closest point on the line.
            result.closestPoint[0] = line.origin + result.lineParameter * line.direction;

            // Compute the closest point on the box.
            result.closestPoint[1] = box.center;
            for (int i = 0; i < 3; ++i)
            {
                result.closestPoint[1] += point[i] * box.axis[i];
            }
            return result;
        }
    };
}