Class Acts::ConeSurface
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class ConeSurface : public Acts::Surface
Class for a conical surface in the Tracking geometry.
It inherits from Surface.
The ConeSurface is special since no corresponding Track parameters exist since they’re numerical instable at the tip of the cone. Propagations to a cone surface will be returned in curvilinear coordinates.
Subclassed by Acts::ConeLayer
Public Functions
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ConeSurface() = delete
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~ConeSurface() override = default
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virtual AlignmentToPathMatrix alignmentToPathDerivative(const GeometryContext &gctx, const FreeVector ¶meters) const final
Calculate the derivative of path length at the geometry constraint or point-of-closest-approach w.r.t.
alignment parameters of the surface (i.e. local frame origin in global 3D Cartesian coordinates and its rotation represented with extrinsic Euler angles)
- Parameters
gctx – The current geometry context object, e.g. alignment
parameters – is the free parameters
- Returns
Derivative of path length w.r.t. the alignment parameters
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virtual Vector3 binningPosition(const GeometryContext &gctx, BinningValue bValue) const final
The binning position method - is overloaded for r-type binning.
- Parameters
gctx – The current geometry context object, e.g. alignment
bValue – defines the type of binning applied in the global frame
- Returns
The return type is a vector for positioning in the global frame
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virtual const ConeBounds &bounds() const final
This method returns the ConeBounds by reference.
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virtual Result<Vector2> globalToLocal(const GeometryContext &gctx, const Vector3 &position, const Vector3 &direction, double tolerance = s_onSurfaceTolerance) const final
Global to local transformation.
- Parameters
gctx – The current geometry context object, e.g. alignment
position – is the global position to be transformed
direction – is the global momentum direction (ignored in this operation)
tolerance – optional tolerance within which a point is considered valid on surface
- Returns
a Result<Vector2> which can be !ok() if the operation fails
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virtual SurfaceMultiIntersection intersect(const GeometryContext &gctx, const Vector3 &position, const Vector3 &direction, const BoundaryCheck &bcheck = false, double tolerance = s_onSurfaceTolerance) const final
Straight line intersection schema from position/direction.
If possible returns both solutions for the cylinder
- Parameters
gctx – The current geometry context object, e.g. alignment
position – The position to start from
direction – The direction at start
bcheck – the Boundary Check
tolerance – the tolerance used for the intersection
- Returns
SurfaceMultiIntersection
object (contains intersection & surface)
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virtual ActsMatrix<2, 3> localCartesianToBoundLocalDerivative(const GeometryContext &gctx, const Vector3 &position) const final
Calculate the derivative of bound track parameters local position w.r.t.
position in local 3D Cartesian coordinates
- Parameters
gctx – The current geometry context object, e.g. alignment
position – The position of the parameters in global
- Returns
Derivative of bound local position w.r.t. position in local 3D cartesian coordinates
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virtual Vector3 localToGlobal(const GeometryContext &gctx, const Vector2 &lposition, const Vector3 &direction) const final
Local to global transformation.
- Parameters
gctx – The current geometry context object, e.g. alignment
lposition – is the local position to be transformed
direction – is the global momentum direction (ignored in this operation)
- Returns
The global position by value
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virtual std::string name() const override
Return properly formatted class name for screen output.
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inline Vector3 normal(const GeometryContext &gctx) const
Normal vector return without argument.
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virtual Vector3 normal(const GeometryContext &gctx, const Vector2 &lposition) const final
Return method for surface normal information.
- Parameters
gctx – The current geometry context object, e.g. alignment
lposition – is the local position at normal vector request
- Returns
Vector3 normal vector in global frame
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Vector3 normal(const GeometryContext &gctx, const Vector2 &lposition) const = 0
Normal vector return without argument.
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Vector3 normal(const GeometryContext &gctx, const Vector3 &position) const
Normal vector return without argument.
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virtual Vector3 normal(const GeometryContext &gctx, const Vector3 &position) const final
Return method for surface normal information.
- Parameters
gctx – The current geometry context object, e.g. alignment
position – is the global position as normal vector base
- Returns
Vector3 normal vector in global frame
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ConeSurface &operator=(const ConeSurface &other)
Assignment operator.
- Parameters
other – is the source surface for the assignment
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virtual double pathCorrection(const GeometryContext &gctx, const Vector3 &position, const Vector3 &direction) const final
The pathCorrection for derived classes with thickness.
- Parameters
gctx – The current geometry context object, e.g. alignment
position – is the global potion at the correction point
direction – is the momentum direction at the correction point
- Returns
is the path correction due to incident angle
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virtual Polyhedron polyhedronRepresentation(const GeometryContext &gctx, size_t lseg) const override
Return a Polyhedron for the surfaces.
Note
that a surface transform can invalidate the extrema in the transformed space
- Parameters
gctx – The current geometry context object, e.g. alignment
lseg – Number of segments along curved lines, it represents the full 2*M_PI coverange, if lseg is set to 1 only the extrema are given
- Returns
A list of vertices and a face/facett description of it
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virtual RotationMatrix3 referenceFrame(const GeometryContext &gctx, const Vector3 &position, const Vector3 &direction) const final
Return the measurement frame - this is needed for alignment, in particular for StraightLine and Perigee Surface.
the default implementation is the RotationMatrix3 of the transform
- Parameters
gctx – The current geometry context object, e.g. alignment
position – is the global position where the measurement frame is constructed
direction – is the momentum direction used for the measurement frame construction
- Returns
matrix that indicates the measurement frame
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virtual Vector3 rotSymmetryAxis(const GeometryContext &gctx) const
- Parameters
gctx – The current geometry context object, e.g. alignment
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virtual SurfaceType type() const override
Return the surface type.
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ConeSurface() = delete