Struct Acts::StraightLineStepper::State¶
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struct Acts::StraightLineStepper::State
State for track parameter propagation.
Public Functions
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State() = delete
Constructor from the initial bound track parameters.
Note
the covariance matrix is copied when needed
- Template Parameters
charge_t – Type of the bound parameter charge
- Parameters
gctx – [in] is the context object for the geometry
mctx – [in] is the context object for the magnetic field
par – [in] The track parameters at start
ndir – [in] The navigation direction w.r.t momentum
ssize – [in] is the maximum step size
stolerance – [in] is the stepping tolerance
Public Members
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Covariance cov = Covariance::Zero()
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bool covTransport = false
Boolean to indiciate if you need covariance transport.
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FreeVector derivative = FreeVector::Zero()
The propagation derivative.
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std::reference_wrapper<const GeometryContext> geoContext
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BoundToFreeMatrix jacToGlobal = BoundToFreeMatrix::Zero()
Jacobian from local to the global frame.
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FreeMatrix jacTransport = FreeMatrix::Identity()
Pure transport jacobian part from runge kutta integration.
Navigation direction, this is needed for searching.
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FreeVector pars = FreeVector::Zero()
Internal free vector parameters.
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double pathAccumulated = 0.
accummulated path length state
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double previousStepSize = 0.
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double q = 1.
The charge as the free vector can be 1/p or q/p.
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ConstrainedStep stepSize = std::numeric_limits<double>::max()
adaptive step size of the runge-kutta integration
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double tolerance = s_onSurfaceTolerance
The tolerance for the stepping.
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State() = delete