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102 lines
3.3 KiB
102 lines
3.3 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: 4.0.2021.05.06
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#pragma once
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#include <Mathematics/IntrIntervals.h>
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#include <Mathematics/IntrLine2Triangle2.h>
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#include <Mathematics/Ray.h>
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// The queries consider the triangle to be a solid.
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namespace gte
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{
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template <typename Real>
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class TIQuery<Real, Ray2<Real>, Triangle2<Real>>
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{
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public:
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struct Result
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{
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Result()
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:
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intersect(false)
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{
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}
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bool intersect;
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};
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Result operator()(Ray2<Real> const& ray, Triangle2<Real> const& triangle)
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{
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Result result{};
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FIQuery<Real, Ray2<Real>, Triangle2<Real>> rtQuery;
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result.intersect = rtQuery(ray, triangle).intersect;
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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, Ray2<Real>, Triangle2<Real>>
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:
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public FIQuery<Real, Line2<Real>, Triangle2<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, Line2<Real>, Triangle2<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()(Ray2<Real> const& ray, Triangle2<Real> const& triangle)
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{
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Result result{};
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DoQuery(ray.origin, ray.direction, triangle, result);
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if (result.numIntersections == 2)
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{
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result.point[0] = ray.origin + result.parameter[0] * ray.direction;
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result.point[1] = ray.origin + result.parameter[1] * ray.direction;
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}
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else if (result.numIntersections == 1)
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{
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result.point[0] = ray.origin + result.parameter[0] * ray.direction;
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result.point[1] = result.point[0];
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}
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// else: result set to no-intersection in DoQuery(...)
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return result;
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}
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protected:
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void DoQuery(Vector2<Real> const& rayOrigin,
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Vector2<Real> const& rayDirection, Triangle2<Real> const& triangle,
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Result& result)
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{
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FIQuery<Real, Line2<Real>, Triangle2<Real>>::DoQuery(rayOrigin,
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rayDirection, triangle, result);
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if (result.intersect)
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{
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// The line containing the ray intersects the triangle; the
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// t-interval is [t0,t1]. The ray intersects the triangle as
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// long as [t0,t1] overlaps the ray t-interval [0,+infinity).
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std::array<Real, 2> rayInterval{ static_cast<Real>(0), std::numeric_limits<Real>::max() };
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FIQuery<Real, std::array<Real, 2>, std::array<Real, 2>> iiQuery;
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auto iiResult = iiQuery(result.parameter, rayInterval);
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if (iiResult.intersect)
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{
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result.numIntersections = iiResult.numIntersections;
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result.parameter = iiResult.overlap;
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}
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else
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{
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// Set the state to no-intersection.
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result = Result{};
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}
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}
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}
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};
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}
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