G4Trd Class Reference

G4Trd is a trapezoid with the X and Y dimensions varying along Z. More...

#include <G4Trd.hh>

Inheritance diagram for G4Trd:

Public Member Functions
	G4Trd (const G4String &pName, G4double pdx1, G4double pdx2, G4double pdy1, G4double pdy2, G4double pdz)
	~G4Trd () override=default
G4double	GetXHalfLength1 () const
G4double	GetXHalfLength2 () const
G4double	GetYHalfLength1 () const
G4double	GetYHalfLength2 () const
G4double	GetZHalfLength () const
void	SetXHalfLength1 (G4double val)
void	SetXHalfLength2 (G4double val)
void	SetYHalfLength1 (G4double val)
void	SetYHalfLength2 (G4double val)
void	SetZHalfLength (G4double val)
void	SetAllParameters (G4double pdx1, G4double pdx2, G4double pdy1, G4double pdy2, G4double pdz)
G4double	GetCubicVolume () override
G4double	GetSurfaceArea () override
void	ComputeDimensions (G4VPVParameterisation *p, const G4int n, const G4VPhysicalVolume *pRep) override
void	BoundingLimits (G4ThreeVector &pMin, G4ThreeVector &pMax) const override
G4bool	CalculateExtent (const EAxis pAxis, const G4VoxelLimits &pVoxelLimit, const G4AffineTransform &pTransform, G4double &pMin, G4double &pMax) const override
EInside	Inside (const G4ThreeVector &p) const override
G4ThreeVector	SurfaceNormal (const G4ThreeVector &p) const override
G4double	DistanceToIn (const G4ThreeVector &p, const G4ThreeVector &v) const override
G4double	DistanceToIn (const G4ThreeVector &p) const override
G4double	DistanceToOut (const G4ThreeVector &p, const G4ThreeVector &v, const G4bool calcNorm=false, G4bool *validNorm=nullptr, G4ThreeVector *n=nullptr) const override
G4double	DistanceToOut (const G4ThreeVector &p) const override
G4GeometryType	GetEntityType () const override
G4ThreeVector	GetPointOnSurface () const override
G4bool	IsFaceted () const override
G4VSolid *	Clone () const override
std::ostream &	StreamInfo (std::ostream &os) const override
void	DescribeYourselfTo (G4VGraphicsScene &scene) const override
G4Polyhedron *	CreatePolyhedron () const override
	G4Trd (__void__ &)
	G4Trd (const G4Trd &rhs)
G4Trd &	operator= (const G4Trd &rhs)
Public Member Functions inherited from G4CSGSolid
	G4CSGSolid (const G4String &pName)
	~G4CSGSolid () override
G4Polyhedron *	GetPolyhedron () const override
	G4CSGSolid (__void__ &)
	G4CSGSolid (const G4CSGSolid &rhs)
G4CSGSolid &	operator= (const G4CSGSolid &rhs)
Public Member Functions inherited from G4VSolid
	G4VSolid (const G4String &name)
virtual	~G4VSolid ()
	G4VSolid (const G4VSolid &rhs)
G4VSolid &	operator= (const G4VSolid &rhs)
G4bool	operator== (const G4VSolid &s) const
G4String	GetName () const
void	SetName (const G4String &name)
G4double	GetTolerance () const
virtual G4int	GetNumOfConstituents () const
void	DumpInfo () const
virtual G4VisExtent	GetExtent () const
virtual const G4VSolid *	GetConstituentSolid (G4int no) const
virtual G4VSolid *	GetConstituentSolid (G4int no)
virtual const G4DisplacedSolid *	GetDisplacedSolidPtr () const
virtual G4DisplacedSolid *	GetDisplacedSolidPtr ()
	G4VSolid (__void__ &)
G4double	EstimateCubicVolume (G4int nStat, G4double epsilon) const
G4double	EstimateSurfaceArea (G4int nStat, G4double epsilon) const

Additional Inherited Members
Protected Member Functions inherited from G4CSGSolid
G4double	GetRadiusInRing (G4double rmin, G4double rmax) const
Protected Member Functions inherited from G4VSolid
void	CalculateClippedPolygonExtent (G4ThreeVectorList &pPolygon, const G4VoxelLimits &pVoxelLimit, const EAxis pAxis, G4double &pMin, G4double &pMax) const
void	ClipCrossSection (G4ThreeVectorList *pVertices, const G4int pSectionIndex, const G4VoxelLimits &pVoxelLimit, const EAxis pAxis, G4double &pMin, G4double &pMax) const
void	ClipBetweenSections (G4ThreeVectorList *pVertices, const G4int pSectionIndex, const G4VoxelLimits &pVoxelLimit, const EAxis pAxis, G4double &pMin, G4double &pMax) const
void	ClipPolygon (G4ThreeVectorList &pPolygon, const G4VoxelLimits &pVoxelLimit, const EAxis pAxis) const
Protected Attributes inherited from G4CSGSolid
G4double	fCubicVolume = 0.0
G4double	fSurfaceArea = 0.0
G4bool	fRebuildPolyhedron = false
G4Polyhedron *	fpPolyhedron = nullptr
Protected Attributes inherited from G4VSolid
G4double	kCarTolerance

Detailed Description

G4Trd is a trapezoid with the X and Y dimensions varying along Z.

Definition at line 64 of file G4Trd.hh.

Constructor & Destructor Documentation

G4Trd() [1/3]

G4Trd::G4Trd	(	const G4String &	pName,
		G4double	pdx1,
		G4double	pdx2,
		G4double	pdy1,
		G4double	pdy2,
		G4double	pdz )

Constructs a trapezoid with name, and half lengths.

Parameters

[in]	pName	The name of the solid.
[in]	pdx1	Half-length along X at the surface positioned at -dz.
[in]	pdx2	Half-length along X at the surface positioned at +dz.
[in]	pdy1	Half-length along Y at the surface positioned at -dz.
[in]	pdy2	Half-length along Y at the surface positioned at +dz.
[in]	pdz	Half-length along Z axis.

Definition at line 60 of file G4Trd.cc.

  : G4CSGSolid(pName), halfCarTolerance(0.5*kCarTolerance),
    fDx1(pdx1), fDx2(pdx2), fDy1(pdy1), fDy2(pdy2), fDz(pdz)
{
  CheckParameters();
  MakePlanes();
}

Referenced by Clone(), G4Trd(), operator=(), and SetZHalfLength().

~G4Trd()

G4Trd::~G4Trd ( )

overridedefault

Default destructor.

G4Trd() [2/3]

G4Trd::G4Trd

(

__void__ &

a

)

Fake default constructor for usage restricted to direct object persistency for clients requiring preallocation of memory for persistifiable objects.

Definition at line 76 of file G4Trd.cc.

  : G4CSGSolid(a), halfCarTolerance(0.5*kCarTolerance),
    fDx1(1.), fDx2(1.), fDy1(1.), fDy2(1.), fDz(1.)
{
  MakePlanes();
}

G4Trd() [3/3]

G4Trd::G4Trd

(

const G4Trd &

rhs

)

Copy constructor and assignment operator.

Definition at line 87 of file G4Trd.cc.

  : G4CSGSolid(rhs), halfCarTolerance(rhs.halfCarTolerance),
    fDx1(rhs.fDx1), fDx2(rhs.fDx2),
    fDy1(rhs.fDy1), fDy2(rhs.fDy2), fDz(rhs.fDz),
    fHx(rhs.fHx), fHy(rhs.fHy)
{
  for (G4int i=0; i<4; ++i) { fPlanes[i] = rhs.fPlanes[i]; }
}

Member Function Documentation

BoundingLimits()

void G4Trd::BoundingLimits ( G4ThreeVector & pMin, G4ThreeVector & pMax ) const

overridevirtual

Computes the bounding limits of the solid.

Parameters

[out]	pMin	The minimum bounding limit point.
[out]	pMax	The maximum bounding limit point.

Reimplemented from G4VSolid.

Definition at line 218 of file G4Trd.cc.

{
  G4double dx1 = GetXHalfLength1();
  G4double dx2 = GetXHalfLength2();
  G4double dy1 = GetYHalfLength1();
  G4double dy2 = GetYHalfLength2();
  G4double dz  = GetZHalfLength();
 
  G4double xmax = std::max(dx1,dx2);
  G4double ymax = std::max(dy1,dy2);
  pMin.set(-xmax,-ymax,-dz);
  pMax.set( xmax, ymax, dz);
 
  // Check correctness of the bounding box
  //
  if (pMin.x() >= pMax.x() || pMin.y() >= pMax.y() || pMin.z() >= pMax.z())
  {
    std::ostringstream message;
    message << "Bad bounding box (min >= max) for solid: "
            << GetName() << " !"
            << "\npMin = " << pMin
            << "\npMax = " << pMax;
    G4Exception("G4Trd::BoundingLimits()", "GeomMgt0001", JustWarning, message);
    DumpInfo();
  }
}

Referenced by CalculateExtent().

CalculateExtent()

G4bool G4Trd::CalculateExtent ( const EAxis pAxis, const G4VoxelLimits & pVoxelLimit, const G4AffineTransform & pTransform, G4double & pMin, G4double & pMax ) const

overridevirtual

Calculates the minimum and maximum extent of the solid, when under the specified transform, and within the specified limits.

Parameters

[in]	pAxis	The axis along which compute the extent.
[in]	pVoxelLimit	The limiting space dictated by voxels.
[in]	pTransform	The internal transformation applied to the solid.
[out]	pMin	The minimum extent value.
[out]	pMax	The maximum extent value.

Returns

True if the solid is intersected by the extent region.

Implements G4VSolid.

Definition at line 249 of file G4Trd.cc.

{
  G4ThreeVector bmin, bmax;
  G4bool exist;
 
  // Check bounding box (bbox)
  //
  BoundingLimits(bmin,bmax);
  G4BoundingEnvelope bbox(bmin,bmax);
#ifdef G4BBOX_EXTENT
  return bbox.CalculateExtent(pAxis,pVoxelLimit,pTransform,pMin,pMax);
#endif
  if (bbox.BoundingBoxVsVoxelLimits(pAxis,pVoxelLimit,pTransform,pMin,pMax))
  {
    return exist = pMin < pMax;
  }
 
  // Set bounding envelope (benv) and calculate extent
  //
  G4double dx1 = GetXHalfLength1();
  G4double dx2 = GetXHalfLength2();
  G4double dy1 = GetYHalfLength1();
  G4double dy2 = GetYHalfLength2();
  G4double dz  = GetZHalfLength();
 
  G4ThreeVectorList baseA(4), baseB(4);
  baseA[0].set(-dx1,-dy1,-dz);
  baseA[1].set( dx1,-dy1,-dz);
  baseA[2].set( dx1, dy1,-dz);
  baseA[3].set(-dx1, dy1,-dz);
  baseB[0].set(-dx2,-dy2, dz);
  baseB[1].set( dx2,-dy2, dz);
  baseB[2].set( dx2, dy2, dz);
  baseB[3].set(-dx2, dy2, dz);
 
  std::vector<const G4ThreeVectorList *> polygons(2);
  polygons[0] = &baseA;
  polygons[1] = &baseB;
 
  G4BoundingEnvelope benv(bmin,bmax,polygons);
  exist = benv.CalculateExtent(pAxis,pVoxelLimit,pTransform,pMin,pMax);
  return exist;
}

Clone()

G4VSolid * G4Trd::Clone ( ) const

overridevirtual

Makes a clone of the object for use in multi-treading.

Returns

A pointer to the new cloned allocated solid.

Reimplemented from G4VSolid.

Definition at line 678 of file G4Trd.cc.

{
  return new G4Trd(*this);
}

ComputeDimensions()

void G4Trd::ComputeDimensions ( G4VPVParameterisation * p, const G4int n, const G4VPhysicalVolume * pRep )

overridevirtual

Dispatch method for parameterisation replication mechanism and dimension computation.

Reimplemented from G4VSolid.

Definition at line 207 of file G4Trd.cc.

{
  p->ComputeDimensions(*this,n,pRep);
}

CreatePolyhedron()

G4Polyhedron * G4Trd::CreatePolyhedron ( ) const

overridevirtual

Creates a Polyhedron used for Visualisation. It is the caller's responsibility to delete it. A null pointer means "not created".

Reimplemented from G4VSolid.

Definition at line 805 of file G4Trd.cc.

{
  return new G4PolyhedronTrd2 (fDx1, fDx2, fDy1, fDy2, fDz);
}

DescribeYourselfTo()

void G4Trd::DescribeYourselfTo ( G4VGraphicsScene & scene ) const

overridevirtual

Methods for creating graphical representations (i.e. for visualisation).

Implements G4VSolid.

Definition at line 800 of file G4Trd.cc.

{
  scene.AddSolid (*this);
}

DistanceToIn() [1/2]

G4double G4Trd::DistanceToIn ( const G4ThreeVector & p ) const

overridevirtual

Calculates the distance to the nearest surface of a shape from an outside point. The distance can be an underestimate.

Parameters

[in]

p

The point at offset p.

Returns

The safety distance to enter the shape.

Implements G4VSolid.

Definition at line 524 of file G4Trd.cc.

{
  G4double dx = fPlanes[3].a*std::abs(p.x())+fPlanes[3].c*p.z()+fPlanes[3].d;
  G4double dy = fPlanes[1].b*std::abs(p.y())+fPlanes[1].c*p.z()+fPlanes[1].d;
  G4double dxy = std::max(dx,dy);
 
  G4double dz = std::abs(p.z())-fDz;
  G4double dist = std::max(dz,dxy);
 
  return (dist > 0) ? dist : 0.;
}

DistanceToIn() [2/2]

G4double G4Trd::DistanceToIn ( const G4ThreeVector & p, const G4ThreeVector & v ) const

overridevirtual

Returns the distance along the normalised vector 'v' to the shape, from the point at offset 'p'. If there is no intersection, returns kInfinity. The first intersection resulting from 'leaving' a surface/volume is discarded. Hence, it is tolerant of points on the surface of the shape.

Parameters

[in]	p	The point at offset p.
[in]	v	The normalised direction vector.

Returns

The distance to enter the shape.

Implements G4VSolid.

Definition at line 428 of file G4Trd.cc.

{
  // Z intersections
  //
  if ((std::abs(p.z()) - fDz) >= -halfCarTolerance && p.z()*v.z() >= 0)
  {
    return kInfinity;
  }
  G4double invz = (-v.z() == 0) ? DBL_MAX : -1./v.z();
  G4double dz = (invz < 0) ? fDz : -fDz;
  G4double tzmin = (p.z() + dz)*invz;
  G4double tzmax = (p.z() - dz)*invz;
 
  // Y intersections
  //
  G4double tmin0 = tzmin, tmax0 = tzmax;
  G4double ya = fPlanes[0].b*v.y(), yb = fPlanes[0].c*v.z();
  G4double yc = fPlanes[0].b*p.y(), yd = fPlanes[0].c*p.z()+fPlanes[0].d;
  G4double cos0 = yb + ya;
  G4double dis0 = yd + yc;
  if (dis0 >= -halfCarTolerance)
  {
    if (cos0 >= 0) { return kInfinity; }
    G4double tmp  = -dis0/cos0;
    if (tmin0 < tmp) { tmin0 = tmp; }
  }
  else if (cos0 > 0)
  {
    G4double tmp  = -dis0/cos0;
    if (tmax0 > tmp) { tmax0 = tmp; }
  }
 
  G4double tmin1 = tmin0, tmax1 = tmax0;
  G4double cos1 = yb - ya;
  G4double dis1 = yd - yc;
  if (dis1 >= -halfCarTolerance)
  {
    if (cos1 >= 0) { return kInfinity; }
    G4double tmp  = -dis1/cos1;
    if (tmin1 < tmp) { tmin1 = tmp; }
  }
  else if (cos1 > 0)
  {
    G4double tmp  = -dis1/cos1;
    if (tmax1 > tmp) { tmax1 = tmp; }
  }
 
  // X intersections
  //
  G4double tmin2 = tmin1, tmax2 = tmax1;
  G4double xa = fPlanes[2].a*v.x(), xb = fPlanes[2].c*v.z();
  G4double xc = fPlanes[2].a*p.x(), xd = fPlanes[2].c*p.z()+fPlanes[2].d;
  G4double cos2 = xb + xa;
  G4double dis2 = xd + xc;
  if (dis2 >= -halfCarTolerance)
  {
    if (cos2 >= 0) { return kInfinity; }
    G4double tmp  = -dis2/cos2;
    if (tmin2 < tmp) { tmin2 = tmp; }
  }
  else if (cos2 > 0)
  {
    G4double tmp  = -dis2/cos2;
    if (tmax2 > tmp) { tmax2 = tmp; }
  }
 
  G4double tmin3 = tmin2, tmax3 = tmax2;
  G4double cos3 = xb - xa;
  G4double dis3 = xd - xc;
  if (dis3 >= -halfCarTolerance)
  {
    if (cos3 >= 0) { return kInfinity; }
    G4double tmp  = -dis3/cos3;
    if (tmin3 < tmp) { tmin3 = tmp; }
  }
  else if (cos3 > 0)
  {
    G4double tmp  = -dis3/cos3;
    if (tmax3 > tmp) { tmax3 = tmp; }
  }
 
  // Find distance
  //
  G4double tmin = tmin3, tmax = tmax3;
  if (tmax <= tmin + halfCarTolerance) { return kInfinity; // touch or no hit
}
  return (tmin < halfCarTolerance ) ? 0. : tmin;
}

DistanceToOut() [1/2]

G4double G4Trd::DistanceToOut ( const G4ThreeVector & p ) const

overridevirtual

Calculates the distance to the nearest surface of a shape from an inside point 'p'. The distance can be an underestimate.

Parameters

[in]

p

The point at offset p.

Returns

The safety distance to exit the shape.

Implements G4VSolid.

Definition at line 628 of file G4Trd.cc.

{
#ifdef G4CSGDEBUG
  if( Inside(p) == kOutside )
  {
    std::ostringstream message;
    G4long oldprc = message.precision(16);
    message << "Point p is outside (!?) of solid: " << GetName() << G4endl;
    message << "Position:\n";
    message << "   p.x() = " << p.x()/mm << " mm\n";
    message << "   p.y() = " << p.y()/mm << " mm\n";
    message << "   p.z() = " << p.z()/mm << " mm";
    G4cout.precision(oldprc);
    G4Exception("G4Trd::DistanceToOut(p)", "GeomSolids1002",
                JustWarning, message );
    DumpInfo();
  }
#endif
  G4double dx = fPlanes[3].a*std::abs(p.x())+fPlanes[3].c*p.z()+fPlanes[3].d;
  G4double dy = fPlanes[1].b*std::abs(p.y())+fPlanes[1].c*p.z()+fPlanes[1].d;
  G4double dxy = std::max(dx,dy);
 
  G4double dz = std::abs(p.z())-fDz;
  G4double dist = std::max(dz,dxy);
 
  return (dist < 0) ? -dist : 0.;
}

DistanceToOut() [2/2]

G4double G4Trd::DistanceToOut ( const G4ThreeVector & p, const G4ThreeVector & v, const G4bool calcNorm = false, G4bool * validNorm = nullptr, G4ThreeVector * n = nullptr ) const

overridevirtual

Returns the distance along the normalised vector 'v' to the shape, from a point at an offset 'p' inside or on the surface of the shape. Intersections with surfaces, when the point is less than Tolerance/2 from a surface must be ignored.

Parameters

[in]	p	The point at offset p.
[in]	v	The normalised direction vector.
[in]	calcNorm	Flag to indicate if to calculate the normal or not.
[out]	validNorm	Flag set to true if the solid lies entirely behind or on the exiting surface. It is set false if the solid does not lie entirely behind or on the exiting surface. 'calcNorm' must be true, otherwise it is unused.
[out]	n	The exiting outwards normal vector (undefined Magnitude). 'calcNorm' must be true, otherwise it is unused.

Returns

The distance to exit the shape.

Implements G4VSolid.

Definition at line 542 of file G4Trd.cc.

{
  // Z intersections
  //
  if ((std::abs(p.z()) - fDz) >= -halfCarTolerance && p.z()*v.z() > 0)
  {
    if (calcNorm)
    {
      *validNorm = true;
      n->set(0, 0, (p.z() < 0) ? -1 : 1);
    }
    return 0;
  }
  G4double vz = v.z();
  G4double tmax = (vz == 0) ? DBL_MAX : (std::copysign(fDz,vz) - p.z())/vz;
  G4int iside = (vz < 0) ? -4 : -2; // little trick: (-4+3)=-1, (-2+3)=+1
 
  // Y intersections
  //
  G4int i = 0;
  for ( ; i<2; ++i)
  {
    G4double cosa = fPlanes[i].b*v.y() + fPlanes[i].c*v.z();
    if (cosa > 0)
    {
      G4double dist = fPlanes[i].b*p.y()+fPlanes[i].c*p.z()+fPlanes[i].d;
      if (dist >= -halfCarTolerance)
      {
        if (calcNorm)
        {
          *validNorm = true;
          n->set(0, fPlanes[i].b, fPlanes[i].c);
        }
        return 0;
      }
      G4double tmp = -dist/cosa;
      if (tmax > tmp) { tmax = tmp; iside = i; }
    }
  }
 
  // X intersections
  //
  for ( ; i<4; ++i)
  {
    G4double cosa = fPlanes[i].a*v.x()+fPlanes[i].c*v.z();
    if (cosa > 0)
    {
      G4double dist = fPlanes[i].a*p.x()+fPlanes[i].c*p.z()+fPlanes[i].d;
      if (dist >= -halfCarTolerance)
      {
        if (calcNorm)
        {
           *validNorm = true;
           n->set(fPlanes[i].a, fPlanes[i].b, fPlanes[i].c);
        }
        return 0;
      }
      G4double tmp = -dist/cosa;
      if (tmax > tmp) { tmax = tmp; iside = i; }
    }
  }
 
  // Set normal, if required, and return distance
  //
  if (calcNorm)
  {
    *validNorm = true;
    if (iside < 0)
    {
      n->set(0, 0, iside + 3); // (-4+3)=-1, (-2+3)=+1
    }
    else
    {
      n->set(fPlanes[iside].a, fPlanes[iside].b, fPlanes[iside].c);
    }
  }
  return tmax;
}

GetCubicVolume()

G4double G4Trd::GetCubicVolume ( )

overridevirtual

Returning an estimation of the solid volume (capacity) and surface area, in internal units.

Reimplemented from G4VSolid.

Definition at line 770 of file G4Trd.cc.

{
  if (fCubicVolume == 0)
  {
    G4AutoLock l(&trdMutex);
    fCubicVolume = 2*fDz*((fDx1+fDx2)*(fDy1+fDy2) + (fDx2-fDx1)*(fDy2-fDy1)/3);
    l.unlock();
  }
  return fCubicVolume;
}

GetEntityType()

G4GeometryType G4Trd::GetEntityType ( ) const

overridevirtual

Returns the type ID, "G4Trd" of the solid.

Implements G4VSolid.

Definition at line 660 of file G4Trd.cc.

{
  return {"G4Trd"};
}

GetPointOnSurface()

G4ThreeVector G4Trd::GetPointOnSurface ( ) const

overridevirtual

Returns a random point located and uniformly distributed on the surface of the solid.

Reimplemented from G4VSolid.

Definition at line 710 of file G4Trd.cc.

{
  G4double sbot = 4.*fDx1*fDy1;  // area of bottom base
  G4double stop = 4.*fDx2*fDy2;  // area of top base
  G4double sbase = sbot + stop;
  G4double sxz = (fDx1 + fDx2)*fHx; // area of Y face
  G4double syz = (fDy1 + fDy2)*fHy; // area of X face
  G4double stotal = sbase + 2.*(sxz + syz);
  G4double select = stotal*G4QuickRand();
 
  G4ThreeVector p;
  G4double u = G4QuickRand();
  G4double v = G4QuickRand();
  if (select < sbase)
  {
    G4bool ifbottom = (select < sbot);
    G4double x = (ifbottom) ? fDx1 : fDx2;
    G4double y = (ifbottom) ? fDy1 : fDy2;
    G4double z = (ifbottom) ? -fDz : fDz;
    p.set((2.*u - 1.)*x, (2.*v - 1.)*y, z);
  }
  else if (select < sbase + 2.*sxz)
  {
    G4double ysign = (select < sbase + sxz) ? 1. : -1.;
    if (ysign < 0.) { select -= sxz; }
    if (u + v > 1.)
    {
      u = 1. - u;
      v = 1. - v;
    }
    G4ThreeVector p0(-fDx1,-fDy1,-fDz);
    G4ThreeVector p1( fDx2,-fDy2, fDz);
    G4ThreeVector p2 = (select < sbase + fDx1*fHx) ?
      G4ThreeVector( fDx1,-fDy1,-fDz) : G4ThreeVector(-fDx2,-fDy2, fDz);
    p = p0*(1. - u - v) + p1*u + p2*v;
    p.setY(ysign*p.y());
  }
  else
  {
    G4double xsign = (select < sbase + 2.*sxz + syz) ? 1. : -1.;
    if (xsign < 0.) { select -= syz; }
    if (u + v > 1.)
    {
      u = 1. - u;
      v = 1. - v;
    }
    G4ThreeVector p0(-fDx1, fDy1,-fDz);
    G4ThreeVector p1(-fDx2,-fDy2, fDz);
    G4ThreeVector p2 = (select < sbase + 2.*sxz + fDy1*fHy) ?
      G4ThreeVector(-fDx1,-fDy1,-fDz) : G4ThreeVector(-fDx2, fDy2, fDz);
    p = p0*(1. - u - v) + p1*u + p2*v;
    p.setX(xsign*p.x());
  }
  return p;
}

GetSurfaceArea()

G4double G4Trd::GetSurfaceArea ( )

overridevirtual

Returns an estimation of the solid surface area in internal units. This method may be overloaded by derived classes to compute the exact geometrical quantity for solids where this is possible, or anyway to cache the computed value. Note: the computed value is NOT cached.

Reimplemented from G4VSolid.

Definition at line 785 of file G4Trd.cc.

{
  if (fSurfaceArea == 0)
  {
    G4AutoLock l(&trdMutex);
    fSurfaceArea = 4*(fDx1*fDy1+fDx2*fDy2)+2*(fDx1+fDx2)*fHx+2*(fDy1+fDy2)*fHy;
    l.unlock();
  }
  return fSurfaceArea;
}

GetXHalfLength1()

G4double G4Trd::GetXHalfLength1 ( ) const

inline

Accessors.

Referenced by BoundingLimits(), G4tgbVolume::BuildSolidForDivision(), CalculateExtent(), G4tgbGeometryDumper::GetSolidParams(), G4GDMLWriteParamvol::Trd_dimensionsWrite(), and G4GDMLWriteSolids::TrdWrite().

GetXHalfLength2()

G4double G4Trd::GetXHalfLength2 ( ) const

inline

Referenced by BoundingLimits(), G4tgbVolume::BuildSolidForDivision(), CalculateExtent(), G4tgbGeometryDumper::GetSolidParams(), G4GDMLWriteParamvol::Trd_dimensionsWrite(), and G4GDMLWriteSolids::TrdWrite().

GetYHalfLength1()

G4double G4Trd::GetYHalfLength1 ( ) const

inline

Referenced by BoundingLimits(), G4tgbVolume::BuildSolidForDivision(), CalculateExtent(), G4tgbGeometryDumper::GetSolidParams(), G4GDMLWriteParamvol::Trd_dimensionsWrite(), and G4GDMLWriteSolids::TrdWrite().

GetYHalfLength2()

G4double G4Trd::GetYHalfLength2 ( ) const

inline

Referenced by BoundingLimits(), G4tgbVolume::BuildSolidForDivision(), CalculateExtent(), G4tgbGeometryDumper::GetSolidParams(), G4GDMLWriteParamvol::Trd_dimensionsWrite(), and G4GDMLWriteSolids::TrdWrite().

GetZHalfLength()

G4double G4Trd::GetZHalfLength ( ) const

inline

Referenced by BoundingLimits(), G4tgbVolume::BuildSolidForDivision(), CalculateExtent(), G4tgbGeometryDumper::GetSolidParams(), G4GDMLWriteParamvol::Trd_dimensionsWrite(), and G4GDMLWriteSolids::TrdWrite().

Inside()

EInside G4Trd::Inside ( const G4ThreeVector & p ) const

overridevirtual

Concrete implementations of the expected query interfaces for solids, as defined in the base class G4VSolid.

Implements G4VSolid.

Definition at line 300 of file G4Trd.cc.

{
  G4double dx = fPlanes[3].a*std::abs(p.x())+fPlanes[3].c*p.z()+fPlanes[3].d;
  G4double dy = fPlanes[1].b*std::abs(p.y())+fPlanes[1].c*p.z()+fPlanes[1].d;
  G4double dxy = std::max(dx,dy);
 
  G4double dz = std::abs(p.z())-fDz;
  G4double dist = std::max(dz,dxy);
 
  return (dist > halfCarTolerance) ? kOutside :
    ((dist > -halfCarTolerance) ? kSurface : kInside);
}

Referenced by DistanceToOut().

IsFaceted()

G4bool G4Trd::IsFaceted ( ) const

overridevirtual

Returns true as the solid has only planar faces.

Reimplemented from G4VSolid.

Definition at line 669 of file G4Trd.cc.

{
  return true;
}

operator=()

G4Trd & G4Trd::operator=

(

const G4Trd &

rhs

)

Definition at line 100 of file G4Trd.cc.

{
   // Check assignment to self
   //
   if (this == &rhs)  { return *this; }
 
   // Copy base class data
   //
   G4CSGSolid::operator=(rhs);
 
   // Copy data
   //
   halfCarTolerance = rhs.halfCarTolerance;
   fDx1 = rhs.fDx1; fDx2 = rhs.fDx2;
   fDy1 = rhs.fDy1; fDy2 = rhs.fDy2;
   fDz = rhs.fDz;
   fHx = rhs.fHx; fHy = rhs.fHy;
   for (G4int i=0; i<4; ++i) { fPlanes[i] = rhs.fPlanes[i]; }
 
   return *this;
}

SetAllParameters()

void G4Trd::SetAllParameters	(	G4double	pdx1,
		G4double	pdx2,
		G4double	pdy1,
		G4double	pdy2,
		G4double	pdz )

Sets all parameters, as for constructor. Checks and sets half-widths.

Definition at line 126 of file G4Trd.cc.

{
  // Reset data of the base class
  fCubicVolume = 0.;
  fSurfaceArea = 0.;
  fRebuildPolyhedron = true;
 
  // Set parameters
  fDx1 = pdx1; fDx2 = pdx2;
  fDy1 = pdy1; fDy2 = pdy2;
  fDz  = pdz;
 
  CheckParameters();
  MakePlanes();
}

Referenced by G4ParameterisationTrdX::ComputeDimensions(), G4ParameterisationTrdY::ComputeDimensions(), and G4ParameterisationTrdZ::ComputeDimensions().

SetXHalfLength1()

void G4Trd::SetXHalfLength1 ( G4double val )

inline

Modifiers.

SetXHalfLength2()

void G4Trd::SetXHalfLength2 ( G4double val )

inline

SetYHalfLength1()

void G4Trd::SetYHalfLength1 ( G4double val )

inline

SetYHalfLength2()

void G4Trd::SetYHalfLength2 ( G4double val )

inline

SetZHalfLength()

void G4Trd::SetZHalfLength ( G4double val )

inline

StreamInfo()

std::ostream & G4Trd::StreamInfo ( std::ostream & os ) const

overridevirtual

Streams the object contents to an output stream.

Reimplemented from G4CSGSolid.

Definition at line 687 of file G4Trd.cc.

{
  G4long oldprc = os.precision(16);
  os << "-----------------------------------------------------------\n"
     << "    *** Dump for solid - " << GetName() << " ***\n"
     << "    ===================================================\n"
     << " Solid type: G4Trd\n"
     << " Parameters: \n"
     << "    half length X, surface -dZ: " << fDx1/mm << " mm \n"
     << "    half length X, surface +dZ: " << fDx2/mm << " mm \n"
     << "    half length Y, surface -dZ: " << fDy1/mm << " mm \n"
     << "    half length Y, surface +dZ: " << fDy2/mm << " mm \n"
     << "    half length Z             : " <<  fDz/mm << " mm \n"
     << "-----------------------------------------------------------\n";
  os.precision(oldprc);
 
  return os;
}

SurfaceNormal()

G4ThreeVector G4Trd::SurfaceNormal ( const G4ThreeVector & p ) const

overridevirtual

Returns the outwards pointing unit normal of the shape for the surface closest to the point at offset 'p'.

Parameters

[in]

p

The point at offset p.

Returns

The outwards pointing unit normal.

Implements G4VSolid.

Definition at line 317 of file G4Trd.cc.

{
  G4int nsurf = 0; // number of surfaces where p is placed
 
  // Check Z faces
  //
  G4double nz = 0;
  G4double dz = std::abs(p.z()) - fDz;
  if (std::abs(dz) <= halfCarTolerance)
  {
    nz = (p.z() < 0) ? -1 : 1;
    ++nsurf;
  }
 
  // Check Y faces
  //
  G4double ny = 0;
  G4double dy1 = fPlanes[0].b*p.y();
  G4double dy2 = fPlanes[0].c*p.z() + fPlanes[0].d;
  if (std::abs(dy2 + dy1) <= halfCarTolerance)
  {
    ny += fPlanes[0].b;
    nz += fPlanes[0].c;
    ++nsurf;
  }
  if (std::abs(dy2 - dy1) <= halfCarTolerance)
  {
    ny += fPlanes[1].b;
    nz += fPlanes[1].c;
    ++nsurf;
  }
 
  // Check X faces
  //
  G4double nx = 0;
  G4double dx1 = fPlanes[2].a*p.x();
  G4double dx2 = fPlanes[2].c*p.z() + fPlanes[2].d;
  if (std::abs(dx2 + dx1) <= halfCarTolerance)
  {
    nx += fPlanes[2].a;
    nz += fPlanes[2].c;
    ++nsurf;
  }
  if (std::abs(dx2 - dx1) <= halfCarTolerance)
  {
    nx += fPlanes[3].a;
    nz += fPlanes[3].c;
    ++nsurf;
  }
 
  // Return normal
  //
  if (nsurf == 1)
  {
    return {nx,ny,nz};
  }
  if (nsurf != 0)
  {
    return G4ThreeVector(nx,ny,nz).unit(); // edge or corner
  }
 
  // Point is not on the surface
  //
#ifdef G4CSGDEBUG
  std::ostringstream message;
  G4long oldprc = message.precision(16);
  message << "Point p is not on surface (!?) of solid: "
          << GetName() << G4endl;
  message << "Position:\n";
  message << "   p.x() = " << p.x()/mm << " mm\n";
  message << "   p.y() = " << p.y()/mm << " mm\n";
  message << "   p.z() = " << p.z()/mm << " mm";
  G4cout.precision(oldprc) ;
  G4Exception("G4Trd::SurfaceNormal(p)", "GeomSolids1002",
              JustWarning, message );
  DumpInfo();
#endif
  return ApproxSurfaceNormal(p);
}

Member Data Documentation

a

G4double G4Trd::a

Definition at line 233 of file G4Trd.hh.

Referenced by DistanceToOut(), and G4Trd().

b

G4double G4Trd::b

Definition at line 233 of file G4Trd.hh.

Referenced by DistanceToOut().

c

G4double G4Trd::c

Definition at line 233 of file G4Trd.hh.

Referenced by DistanceToOut().

d

G4double G4Trd::d

Definition at line 233 of file G4Trd.hh.

---

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

• G4Trd.hh
• G4Trd.cc