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58 lines
1.6 KiB
58 lines
1.6 KiB
// David Eberly, Geometric Tools, Redmond WA 98052
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// Copyright (c) 1998-2021
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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// https://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
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// Version: 4.0.2019.08.13
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#pragma once
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#include <Mathematics/DCPQuery.h>
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#include <Mathematics/Ray.h>
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namespace gte
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{
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template <int N, typename Real>
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class DCPQuery<Real, Vector<N, Real>, Ray<N, Real>>
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{
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public:
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struct Result
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{
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Real distance, sqrDistance;
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Real rayParameter; // t in [0,+infinity)
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Vector<N, Real> rayClosest; // origin + t * direction
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};
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Result operator()(Vector<N, Real> const& point, Ray<N, Real> const& ray)
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{
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Result result;
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Vector<N, Real> diff = point - ray.origin;
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result.rayParameter = Dot(ray.direction, diff);
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if (result.rayParameter > (Real)0)
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{
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result.rayClosest = ray.origin + result.rayParameter * ray.direction;
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}
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else
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{
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result.rayClosest = ray.origin;
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}
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diff = point - result.rayClosest;
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result.sqrDistance = Dot(diff, diff);
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result.distance = std::sqrt(result.sqrDistance);
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return result;
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}
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};
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// Template aliases for convenience.
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template <int N, typename Real>
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using DCPPointRay = DCPQuery<Real, Vector<N, Real>, Ray<N, Real>>;
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template <typename Real>
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using DCPPoint2Ray2 = DCPPointRay<2, Real>;
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template <typename Real>
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using DCPPoint3Ray3 = DCPPointRay<3, Real>;
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}
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