celeritas::orangeinp::Cone Class Reference

A closed truncated cone along the z axis centered on the origin. More...

#include <IntersectRegion.hh>

Inheritance diagram for celeritas::orangeinp::Cone:

Public Member Functions
	Cone (Real2 const &radii, real_type halfheight)
	Construct with Z half-height and lo, hi radii.
void	build (IntersectSurfaceBuilder &) const final
	Build surfaces.
void	output (JsonPimpl *) const final
	Write output to the given JSON object.
bool	encloses (Cone const &other) const
	Whether this encloses another cone.
Real2 const &	radii () const
	Lower and upper radii.
real_type	halfheight () const
	Half-height along Z.

Additional Inherited Members
Protected Member Functions inherited from celeritas::orangeinp::IntersectRegionInterface
	CELER_DEFAULT_COPY_MOVE (IntersectRegionInterface)

Detailed Description

A closed truncated cone along the z axis centered on the origin.

A quadric cone technically defines two opposing cones that touch at a single vanishing point, but this cone is required to be truncated so that the vanishing point is on our outside the cone.

The midpoint along the z axis of the cone is the origin. A cone is not allowed to have equal radii: for that, use a cylinder. However, it may have a single radius of zero, which puts the vanishing point on one end of the cone.

This intersect region, along with the Cylinder, is a base component of the G4Polycone (PCON).

Note

The Cone is allowed to be "degenerate" in the sense of having nearly equal lower and upper radii. It will construct a cylinder with an average of the two radii.

Member Function Documentation

build()

void celeritas::orangeinp::Cone::build ( IntersectSurfaceBuilder &  insert_surface ) const

finalvirtual

Build surfaces.

The inner bounding box of a cone is determined with the following procedure:

• Represent a radial slice of the cone as a right triangle with base b (aka the higher radius) and height h (translated vanishing point)
• An interior bounding box (along the xy diagonal cut!) will satisfy r = b - tangent * z
• Maximize the area of that box to obtain r = b / 2, i.e. z = h / 2
• Truncate z so that it's not outside of the half-height
• Project that radial slice onto the xz plane by multiplying 1/sqrt(2)

Implements celeritas::orangeinp::IntersectRegionInterface.

output()

void celeritas::orangeinp::Cone::output ( JsonPimpl *  j ) const

finalvirtual

Write output to the given JSON object.

Implements celeritas::orangeinp::IntersectRegionInterface.

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The documentation for this class was generated from the following files:

• IntersectRegion.hh
• IntersectRegion.cc