Struct Acts::StraightLineStepper::State
-
struct State
State for track parameter propagation.
Public Functions
-
State() = delete
-
inline explicit State(const GeometryContext &gctx, const MagneticFieldContext &mctx, const BoundTrackParameters &par, double ssize = std::numeric_limits<double>::max(), double stolerance = s_onSurfaceTolerance)
Constructor from the initial bound track parameters.
Note
the covariance matrix is copied when needed
- 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
ssize – [in] is the maximum step size
stolerance – [in] is the stepping tolerance
Public Members
-
Covariance cov = Covariance::Zero()
-
bool covTransport = false
Boolean to indicate if you need covariance transport.
-
FreeVector derivative = FreeVector::Zero()
The propagation derivative.
-
std::reference_wrapper<const GeometryContext> geoContext
-
BoundToFreeMatrix jacToGlobal = BoundToFreeMatrix::Zero()
Jacobian from local to the global frame.
-
FreeMatrix jacTransport = FreeMatrix::Identity()
Pure transport jacobian part from runge kutta integration.
-
FreeVector pars = FreeVector::Zero()
Internal free vector parameters.
-
ParticleHypothesis particleHypothesis = ParticleHypothesis::pion()
Particle hypothesis.
-
double pathAccumulated = 0.
accummulated path length state
-
double previousStepSize = 0.
-
ConstrainedStep stepSize
adaptive step size of the runge-kutta integration
-
double tolerance = s_onSurfaceTolerance
The tolerance for the stepping.
-
State() = delete