Class DirectNavigator

• Defined in File DirectNavigator.hpp

Nested Relationships

Nested Types

• Struct DirectNavigator::Initializer

• Struct Initializer::this_result

• Struct DirectNavigator::State

Class Documentation

class Acts::DirectNavigator

DirectNavigator class.

This is a fully guided navigator that progresses through a pre-given sequence of surfaces.

This can either be used as a validation tool, for truth tracking, or track refitting

Public Types

using SurfaceIter = std::vector<const Surface*>::iterator

using SurfaceSequence = std::vector<const Surface*>

The sequentially crossed surfaces.

Public Functions

DirectNavigator() = default

Defaulted Constructed.

template<typename propagator_state_t, typename stepper_t>
void status(propagator_state_t &state, const stepper_t &stepper) const

Navigator status call.

Template Parameters

• propagator_state_t: is the type of Propagatgor state

• stepper_t: is the used type of the Stepper by the Propagator

Parameters

• [inout] state: is the mutable propagator state object

• [in] stepper: Stepper in use

template<typename propagator_state_t, typename stepper_t>
void target(propagator_state_t &state, const stepper_t &stepper) const

Navigator target call.

Template Parameters

• propagator_state_t: is the type of Propagatgor state

• stepper_t: is the used type of the Stepper by the Propagator

Parameters

• [inout] state: is the mutable propagator state object

• [in] stepper: Stepper in use

Public Members

double tolerance = s_onSurfaceTolerance

The tolerance used to define “surface reached”.

struct Initializer

Nested Actor struct, called Initializer.

This is needed for the initialization of the surface sequence

Public Types

using result_type = this_result

Public Functions

Initializer() = default

Defaulting the constructor.

template<typename propagator_state_t, typename stepper_t>
void operator()(propagator_state_t &state, const stepper_t&, result_type &r) const

Actor operator call.

Template Parameters

• statet: Type of the full propagator state

• stepper_t: Type of the stepper

Parameters

• state: the entire propagator state

• r: the result of this Actor

template<typename propagator_state_t, typename stepper_t>
void operator()(propagator_state_t&, const stepper_t&) const

Actor operator call - resultless, unused.

Public Members

SurfaceSequence navSurfaces = {}

The Surface sequence.

struct this_result

Actor result / state.

Public Members

bool initialized = false

struct State

Nested State struct.

It acts as an internal state which is created for every propagation/extrapolation step and keep thread-local navigation information

Public Members

const Surface *currentSurface = nullptr

Navigation state - external interface: the current surface.

const TrackingVolume *currentVolume = nullptr

Navigation state: the current volume.

bool navigationBreak = false

Navigation state - external interface: a break has been detected.

SurfaceIter navSurfaceIter = navSurfaces.begin()

Iterator the the next surface.

SurfaceSequence navSurfaces = {}

Externally provided surfaces - expected to be ordered along the path.

const Layer *startLayer = nullptr

Navigation state - starting layer.

const Surface *startSurface = nullptr

Navigation state - external interface: the start surface.

const TrackingVolume *startVolume = nullptr

Navigation state: the start volume.

const Layer *targetLayer = nullptr

Navigation state - target layer.

bool targetReached = false

Navigation state - external interface: target is reached.

const Surface *targetSurface = nullptr

Navigation state - external interface: the target surface.

const TrackingVolume *targetVolume = nullptr

Navigation state: the target volume.