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93 lines
2.9 KiB
93 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/IntrRay2AlignedBox2.h>
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#include <Mathematics/OrientedBox.h>
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// The queries consider the box to be a solid.
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//
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// The test-intersection queries use the method of separating axes.
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// https://www.geometrictools.com/Documentation/MethodOfSeparatingAxes.pdf
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// The find-intersection queries use parametric clipping against the four
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// edges of the box.
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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>, OrientedBox2<Real>>
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:
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public TIQuery<Real, Ray2<Real>, AlignedBox2<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 TIQuery<Real, Ray2<Real>, AlignedBox2<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, OrientedBox2<Real> const& box)
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{
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// Transform the ray to the oriented-box coordinate system.
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Vector2<Real> diff = ray.origin - box.center;
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Vector2<Real> rayOrigin
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{
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Dot(diff, box.axis[0]),
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Dot(diff, box.axis[1])
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};
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Vector2<Real> rayDirection = Vector2<Real>
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{
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Dot(ray.direction, box.axis[0]),
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Dot(ray.direction, box.axis[1])
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};
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Result result;
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this->DoQuery(rayOrigin, rayDirection, box.extent, result);
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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>, OrientedBox2<Real>>
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:
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public FIQuery<Real, Ray2<Real>, AlignedBox2<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, Ray2<Real>, AlignedBox2<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, OrientedBox2<Real> const& box)
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{
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// Transform the ray to the oriented-box coordinate system.
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Vector2<Real> diff = ray.origin - box.center;
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Vector2<Real> rayOrigin
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{
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Dot(diff, box.axis[0]),
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Dot(diff, box.axis[1])
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};
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Vector2<Real> rayDirection = Vector2<Real>
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{
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Dot(ray.direction, box.axis[0]),
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Dot(ray.direction, box.axis[1])
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};
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Result result;
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this->DoQuery(rayOrigin, rayDirection, box.extent, result);
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for (int i = 0; i < result.numIntersections; ++i)
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{
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result.point[i] = ray.origin + result.parameter[i] * ray.direction;
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}
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return result;
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}
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};
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}
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