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98 lines
2.9 KiB
98 lines
2.9 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/IntrLine3Plane3.h>
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#include <Mathematics/Ray.h>
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namespace gte
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{
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template <typename Real>
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class TIQuery<Real, Ray3<Real>, Plane3<Real>>
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{
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public:
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struct Result
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{
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bool intersect;
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};
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Result operator()(Ray3<Real> const& ray, Plane3<Real> const& plane)
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{
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Result result;
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// Compute the (signed) distance from the ray origin to the plane.
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DCPQuery<Real, Vector3<Real>, Plane3<Real>> vpQuery;
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auto vpResult = vpQuery(ray.origin, plane);
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Real DdN = Dot(ray.direction, plane.normal);
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if (DdN > (Real)0)
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{
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// The ray is not parallel to the plane and is directed toward
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// the +normal side of the plane.
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result.intersect = (vpResult.signedDistance <= (Real)0);
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}
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else if (DdN < (Real)0)
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{
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// The ray is not parallel to the plane and is directed toward
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// the -normal side of the plane.
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result.intersect = (vpResult.signedDistance >= (Real)0);
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}
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else
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{
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// The ray and plane are parallel.
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result.intersect = (vpResult.distance == (Real)0);
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}
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return result;
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}
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};
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template <typename Real>
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class FIQuery<Real, Ray3<Real>, Plane3<Real>>
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:
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public FIQuery<Real, Line3<Real>, Plane3<Real>>
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{
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public:
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struct Result
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:
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public FIQuery<Real, Line3<Real>, Plane3<Real>>::Result
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{
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// No additional information to compute.
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};
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Result operator()(Ray3<Real> const& ray, Plane3<Real> const& plane)
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{
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Result result;
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DoQuery(ray.origin, ray.direction, plane, result);
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if (result.intersect)
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{
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result.point = ray.origin + result.parameter * ray.direction;
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}
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return result;
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}
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protected:
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void DoQuery(Vector3<Real> const& rayOrigin,
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Vector3<Real> const& rayDirection, Plane3<Real> const& plane,
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Result& result)
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{
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FIQuery<Real, Line3<Real>, Plane3<Real>>::DoQuery(rayOrigin,
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rayDirection, plane, result);
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if (result.intersect)
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{
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// The line intersects the plane in a point that might not be
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// on the ray.
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if (result.parameter < (Real)0)
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{
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result.intersect = false;
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result.numIntersections = 0;
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}
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}
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}
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};
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}
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