Struct Acts::InterpolatedBFieldMap::FieldCell

struct Acts::InterpolatedBFieldMap::FieldCell

struct representing smallest grid unit in magnetic field grid

This type encapsulate all required information to perform linear interpolation of magnetic field values within a confined 3D volume.

Public Functions

inline FieldCell(std::array<double, DIM_POS> lowerLeft, std::array<double, DIM_POS> upperRight, std::array<Vector3, N> fieldValues)

default constructor

Parameters

  • lowerLeft – [in] generalized lower-left corner of hyper box (containing the minima of the hyper box along each Dimension)

  • upperRight – [in] generalized upper-right corner of hyper box (containing the maxima of the hyper box along each Dimension)

  • fieldValues – [in] field values at the hyper box corners sorted in the canonical order defined in Acts::interpolate

inline Vector3 getField(const ActsVector<DIM_POS> &position) const

retrieve field at given position

Parameters

position – [in] global 3D position

Returns

magnetic field value at the given position

Pre

The given position must lie within the current field cell.

inline bool isInside(const ActsVector<DIM_POS> &position) const

check whether given 3D position is inside this field cell

Parameters

position – [in] global 3D position

Returns

true if position is inside the current field cell, otherwise false

Public Static Attributes

static constexpr unsigned int N = 1 << DIM_POS

number of corner points defining the confining hyper-box