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100 lines
3.1 KiB
100 lines
3.1 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/Segment.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, Segment3<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()(Segment3<Real> const& segment, Plane3<Real> const& plane)
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{
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Result result;
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// Compute the (signed) distance from the segment endpoints to the
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// plane.
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DCPQuery<Real, Vector3<Real>, Plane3<Real>> vpQuery;
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Real sdistance0 = vpQuery(segment.p[0], plane).signedDistance;
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if (sdistance0 == (Real)0)
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{
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// Endpoint p[0] is on the plane.
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result.intersect = true;
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return result;
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}
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Real sdistance1 = vpQuery(segment.p[1], plane).signedDistance;
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if (sdistance1 == (Real)0)
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{
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// Endpoint p[1] is on the plane.
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result.intersect = true;
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return result;
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}
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// Test whether the segment transversely intersects the plane.
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result.intersect = (sdistance0 * sdistance1 < (Real)0);
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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, Segment3<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()(Segment3<Real> const& segment, Plane3<Real> const& plane)
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{
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Vector3<Real> segOrigin, segDirection;
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Real segExtent;
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segment.GetCenteredForm(segOrigin, segDirection, segExtent);
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Result result;
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DoQuery(segOrigin, segDirection, segExtent, plane, result);
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if (result.intersect)
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{
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result.point = segOrigin + result.parameter * segDirection;
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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& segOrigin,
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Vector3<Real> const& segDirection, Real segExtent,
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Plane3<Real> const& plane, Result& result)
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{
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FIQuery<Real, Line3<Real>, Plane3<Real>>::DoQuery(segOrigin,
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segDirection, 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 segment.
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if (std::fabs(result.parameter) > segExtent)
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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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