Struct CovarianceCache¶
Defined in File CovarianceTransport.hpp
Struct Documentation¶
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struct
Acts
::
CovarianceCache
¶ Helper struct holding the necessary cache for the Covariance transport in various parametrisations.
Public Functions
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CovarianceCache
() = default¶ Defaulted constructor, gives invalid cache.
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CovarianceCache
(const GeometryContext &gctx, const Surface &surface, const Vector3 position, const BoundVector &boundParameters, const BoundSymMatrix &boundCovariance)¶ Constructor from bound & surface.
This constructor will set the variant covariance type to a bound matrix, remember the surface & establish the jacobian between bound and free parametrisation.
- Parameters
gctx
: The current geometry contextsurface
: The surface of the bound representationposition
: The position of the representaitonboundVector
: The bound parameters at the surfaceboundCovariance
: The bound covariance to be propagated
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CovarianceCache
(const Vector3 position, const Vector3 &direction, const BoundSymMatrix &boundCovariance)¶ Constructor from curvilinear.
This constructor will set the variant covariance type to a bound matrix, remember the surface & establish the jacobian between bound and free parametrisation.
- Parameters
position
: The position of the representationdirection
: The direction of at the representationboundCovariance
: The bound covariance to be propagated
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CovarianceCache
(const FreeVector &freeParameters, const FreeSymMatrix &freeCovariance)¶ Construction from free.
- Parameters
freeParameters
: The free parametersfreeCovariance
: The free covariance to be propagated
Public Members
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std::optional<ActsMatrix<8, 7>>
anglesToDirectionJacobian
= std::nullopt¶ Options for starting from free.
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bool
applyTransport
= false¶ Internal cache state, indicates correct setup.
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std::optional<BoundToFreeMatrix>
boundToFreeJacobian
= std::nullopt¶ Optional for starting from bound or curvilinear.
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VariantCovariance
covariance
¶ Variant: the currently held covariance.
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std::optional<ActsMatrix<7, 8>>
directionToAnglesJacobian
= std::nullopt¶
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FreeVector
freeToPathDerivatives
= FreeVector::Zero()¶ Non-variant: the free derivatives.
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FreeMatrix
freeTransportJacobian
= FreeMatrix::Identity()¶ Non-variant: the free transport jacobian.
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