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| Original file line number | Diff line number | Diff line change |
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| // This file is part of the Acts project. | ||
| // | ||
| // Copyright (C) 2024 CERN for the benefit of the Acts project | ||
| // | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
|
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| #pragma once | ||
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| #include "Acts/Definitions/Algebra.hpp" | ||
| #include "Acts/Geometry/GeometryContext.hpp" | ||
| #include "Acts/Surfaces/BoundaryTolerance.hpp" | ||
| #include "Acts/Utilities/Intersection.hpp" | ||
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| #include <tuple> | ||
| #include <vector> | ||
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| namespace Acts { | ||
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| // To be removed when the namespace Experimental is omitted | ||
| namespace Experimental { | ||
| class Portal; | ||
| } | ||
| using namespace Experimental; | ||
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| class Surface; | ||
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| /// The NavigationStream is a container for the navigation candidates that | ||
| /// are currentlu processed in a given context. The context could be local to a | ||
| /// volume, or global to an entire track following. | ||
| /// | ||
| /// The current candidates are stored in a vector of candidates, where an index | ||
| /// is used to indicate the current active candidate. | ||
| class NavigationStream { | ||
| public: | ||
| /// The query point for the navigation stream | ||
| /// | ||
| /// This holds the position and direction from which the navigation stream | ||
| /// should either be initialized or updated. | ||
| struct QueryPoint { | ||
| /// The position of the query point | ||
| Vector3 position = Vector3::Zero(); | ||
| /// The direction of the query point | ||
| Vector3 direction = Vector3::Zero(); | ||
| }; | ||
|
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| /// This is a candidate object of the navigation stream, it holds: | ||
| /// | ||
| /// - a Surface intersection | ||
| /// - a Portal : set if the surface represents a portal | ||
| /// - a BoundaryTolerance : the boundary tolerance used for the intersection | ||
| struct Candidate { | ||
| /// The intersection | ||
| ObjectIntersection<Surface> intersection = | ||
| ObjectIntersection<Surface>::invalid(); | ||
| /// The portal | ||
| const Portal* portal = nullptr; | ||
| /// The boundary tolerance | ||
| BoundaryTolerance bTolerance = BoundaryTolerance::None(); | ||
| /// Convenience access to surface | ||
| const Surface& surface() const { return *intersection.object(); } | ||
| /// Cinvencience access to the path length | ||
| ActsScalar pathLength() const { return intersection.pathLength(); } | ||
|
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| /// Order along the path length | ||
| /// | ||
| /// @param aCandidate is the first candidate | ||
| /// @param bCandidate is the second candidate | ||
| /// | ||
| /// @return true if aCandidate is closer to the origin | ||
| constexpr static bool pathLengthOrder(const Candidate& aCandidate, | ||
| const Candidate& bCandidate) { | ||
| return ObjectIntersection<Surface>::pathLengthOrder( | ||
| aCandidate.intersection, bCandidate.intersection); | ||
| } | ||
| }; | ||
|
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| /// Switch to next next candidate | ||
| /// | ||
| /// @return true if a next candidate is available | ||
| bool switchToNextCandidate() { | ||
| if (m_currentIndex < m_candidates.size()) { | ||
| ++m_currentIndex; | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
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| /// Const access the current candidate | ||
| const Candidate& currentCandidate() const { | ||
| return m_candidates.at(m_currentIndex); | ||
| } | ||
|
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| /// Current Index | ||
| std::size_t currentIndex() const { return m_currentIndex; } | ||
|
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| /// Non-cost access the candidate vector | ||
| std::vector<Candidate>& candidates() { return m_candidates; } | ||
|
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| /// Const access the candidate vector | ||
| const std::vector<Candidate>& candidates() const { return m_candidates; } | ||
|
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| /// Non-cost access the current candidate | ||
| /// | ||
| /// This will throw and out of bounds exception if the stream is not | ||
| /// valid anymore. | ||
| Candidate& currentCandidate() { return m_candidates.at(m_currentIndex); } | ||
|
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| /// The number of active candidates | ||
| std::size_t remainingCandidates() const { | ||
| return (m_candidates.size() - m_currentIndex); | ||
| } | ||
|
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| /// Fill one surface into the candidate vector | ||
| /// | ||
| /// @param surface the surface to be filled | ||
| /// @param bTolerance the boundary tolerance used for the intersection | ||
| void addSurfaceCandidate(const Surface* surface, | ||
| const BoundaryTolerance& bTolerance); | ||
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| /// Fill n surfaces into the candidate vector | ||
| /// | ||
| /// @param surfaces the surfaces that are filled in | ||
| /// @param bTolerance the boundary tolerance used for the intersection | ||
| void addSurfaceCandidates(const std::vector<const Surface*>& surfaces, | ||
| const BoundaryTolerance& bTolerance); | ||
|
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| /// Fill one portal into the candidate vector | ||
| /// | ||
| /// @param portal the portals that are filled in | ||
| void addPortalCandidate(const Portal* portal); | ||
|
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| /// Fill n portals into the candidate vector | ||
| /// | ||
| /// @param portals the portals that are filled in | ||
| void addPortalCandidates(const std::vector<const Portal*>& portals); | ||
|
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| /// Initialize the stream from a query point | ||
| /// | ||
| /// @param gctx is the geometry context | ||
| /// @param queryPoint holds current position, direction, etc. | ||
| /// @param cTolerance is the candidate search tolerance | ||
| /// @param onSurfaceTolerance is the tolerance for on-surface intersections | ||
| /// | ||
| /// This method will first de-duplicate the candidates on basis of the surface | ||
| /// pointer to make sure that the multi-intersections are handled correctly. | ||
| /// This will allow intializeStream() to be called even as a re-initialization | ||
| /// and still work correctly with at one time valid candidates. | ||
| /// | ||
| /// @return true if the stream is active, false indicates that there are no valid candidates | ||
| bool initialize(const GeometryContext& gctx, | ||
| const NavigationStream::QueryPoint& queryPoint, | ||
| const BoundaryTolerance& cTolerance, | ||
| ActsScalar onSurfaceTolerance = s_onSurfaceTolerance); | ||
|
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| /// Convenience method to update a stream from a new query point, | ||
| /// this could be called from navigation delegates that do not require | ||
| /// a local state or from the navigator on the target stream | ||
| /// | ||
| /// @param gctx is the geometry context | ||
| /// @param queryPoint holds current position, direction, etc. | ||
| /// @param onSurfaceTolerance is the tolerance for on-surface intersections | ||
| /// | ||
| /// @return true if the stream is active, false indicate no valid candidates left | ||
| bool update(const GeometryContext& gctx, | ||
| const NavigationStream::QueryPoint& queryPoint, | ||
| ActsScalar onSurfaceTolerance = s_onSurfaceTolerance); | ||
|
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| private: | ||
| /// The candidates of this navigation stream | ||
| std::vector<Candidate> m_candidates; | ||
|
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| /// The currently active candidate | ||
| std::size_t m_currentIndex = 0u; | ||
| }; | ||
|
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| } // namespace Acts |
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