G4SolidExtentList Class Reference

G4SolidExtentList is utility class designed for calculating the extent of a CSG-like solid for a voxel. More...

#include <G4SolidExtentList.hh>

Public Member Functions
	G4SolidExtentList ()
	G4SolidExtentList (const EAxis targetAxis, const G4VoxelLimits &voxelLimits)
	~G4SolidExtentList ()=default
void	AddSurface (const G4ClippablePolygon &surface)
G4bool	GetExtent (G4double &min, G4double &max) const

Detailed Description

G4SolidExtentList is utility class designed for calculating the extent of a CSG-like solid for a voxel.

Definition at line 50 of file G4SolidExtentList.hh.

Constructor & Destructor Documentation

G4SolidExtentList() [1/2]

G4SolidExtentList::G4SolidExtentList

(

)

Default Constructor.

Definition at line 37 of file G4SolidExtentList.cc.

{
  axis = kZAxis;
  minLimit = -INT_MAX/2;
  maxLimit =  INT_MAX/2;
}

G4SolidExtentList() [2/2]

G4SolidExtentList::G4SolidExtentList	(	const EAxis	targetAxis,
		const G4VoxelLimits &	voxelLimits )

Constructor provided axis and limits.

Parameters

[in]	targetAxis	Axis along which compute the extent.
[in]	voxelLimits	The limiting space dictated by voxels.

Definition at line 46 of file G4SolidExtentList.cc.

{
  axis = targetAxis;
  
  limited = voxelLimits.IsLimited( axis );
  if (limited)
  {
    minLimit = voxelLimits.GetMinExtent( axis );
    maxLimit = voxelLimits.GetMaxExtent( axis );
  }
  else
  {
    minLimit = -INT_MAX/2;
    maxLimit =  INT_MAX/2;
  }
}

~G4SolidExtentList()

G4SolidExtentList::~G4SolidExtentList ( )

default

Default Destructor.

Member Function Documentation

AddSurface()

void G4SolidExtentList::AddSurface

(

const G4ClippablePolygon &

surface

)

Categorises polygon surfaces.

Definition at line 67 of file G4SolidExtentList.cc.

{
  //
  // Keep track of four surfaces
  //
  G4double smin=.0, smax=0.;
  
  surface.GetExtent( axis, smin, smax );
  
  if (smin > maxLimit)
  {
    //
    // Nearest surface beyond maximum limit
    //
    if (surface.InFrontOf(minAbove,axis)) { minAbove = surface; }
  }
  else if (smax < minLimit)
  {
    //
    // Nearest surface below minimum limit
    //
    if (surface.BehindOf(maxBelow,axis)) { maxBelow = surface; }
  }
  else
  {
    //
    // Max and min surfaces inside
    //
    if (surface.BehindOf(maxSurface,axis)) { maxSurface = surface; }
    if (surface.InFrontOf(minSurface,axis)) { minSurface = surface; }
  }
}

Referenced by G4PolyconeSide::CalculateExtent(), G4PolyhedraSide::CalculateExtent(), and G4PolyPhiFace::CalculateExtent().

GetExtent()

G4bool G4SolidExtentList::GetExtent	(	G4double &	min,
		G4double &	max ) const

Returns extent after processing all surfaces.

Parameters

[out]	min	The minimum extent
[out]	max	The maximum extent

Returns

false if no surfaces within limits or facing inwards.

Definition at line 104 of file G4SolidExtentList.cc.

{
  G4double kCarTolerance = G4GeometryTolerance::GetInstance()
                           ->GetSurfaceTolerance();
  //
  // Did we have any surfaces within the limits?
  //
  if (minSurface.Empty())
  {
    //
    // Nothing! Do we have anything above?
    //
    if (minAbove.Empty()) { return false; }
    
    //
    // Yup. Is it facing inwards?
    //
    if (minAbove.GetNormal().operator()(axis) < 0) { return false; }
    
    //
    // No. We must be entirely within the solid
    //
    emax = maxLimit + kCarTolerance;
    emin = minLimit - kCarTolerance;
    return true;
  }
  
  //
  // Check max surface
  //
  if (maxSurface.GetNormal().operator()(axis) < 0)
  {
    //
    // Inward facing: max limit must be embedded within solid
    //
    emax = maxLimit + kCarTolerance;
  }
  else
  {
    G4double sMin=0., sMax=0.;
    maxSurface.GetExtent( axis, sMin, sMax );
    emax = ( (sMax > maxLimit) ? maxLimit : sMax ) + kCarTolerance;
  }
  
  //
  // Check min surface
  //
  if (minSurface.GetNormal().operator()(axis) > 0)
  {
    //
    // Inward facing: max limit must be embedded within solid
    //
    emin = minLimit - kCarTolerance;
  }
  else
  {
    G4double sMin=0., sMax=0.;
    minSurface.GetExtent( axis, sMin, sMax );
    emin = ( (sMin < minLimit) ? minLimit : sMin ) - kCarTolerance;
  }
  
  return true;
}

Referenced by G4VCSGfaceted::CalculateExtent().

---

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

• G4SolidExtentList.hh
• G4SolidExtentList.cc