G4TwistTubsHypeSide Class Reference

G4TwistTubsHypeSide describes hyperbolic boundary surface for a cylinder. More...

#include <G4TwistTubsHypeSide.hh>

Inheritance diagram for G4TwistTubsHypeSide:

Public Member Functions
	G4TwistTubsHypeSide (const G4String &name, const G4RotationMatrix &rot, const G4ThreeVector &tlate, const G4int handedness, const G4double kappa, const G4double tanstereo, const G4double r0, const EAxis axis0=kPhi, const EAxis axis1=kZAxis, G4double axis0min=-kInfinity, G4double axis1min=-kInfinity, G4double axis0max=kInfinity, G4double axis1max=kInfinity)
	G4TwistTubsHypeSide (const G4String &name, G4double EndInnerRadius[2], G4double EndOuterRadius[2], G4double DPhi, G4double EndPhi[2], G4double EndZ[2], G4double InnerRadius, G4double OuterRadius, G4double Kappa, G4double TanInnerStereo, G4double TanOuterStereo, G4int handedness)
	~G4TwistTubsHypeSide () override=default
G4int	DistanceToSurface (const G4ThreeVector &gp, const G4ThreeVector &gv, G4ThreeVector gxx[], G4double distance[], G4int areacode[], G4bool isvalid[], EValidate validate=kValidateWithTol) override
G4int	DistanceToSurface (const G4ThreeVector &gp, G4ThreeVector gxx[], G4double distance[], G4int areacode[]) override
G4ThreeVector	GetNormal (const G4ThreeVector &p, G4bool isGlobal=false) override
EInside	Inside (const G4ThreeVector &gp)
G4double	GetRhoAtPZ (const G4ThreeVector &p, G4bool isglobal=false) const
	G4TwistTubsHypeSide (__void__ &)
Public Member Functions inherited from G4VTwistSurface
	G4VTwistSurface (const G4String &name)
	G4VTwistSurface (const G4String &name, const G4RotationMatrix &rot, const G4ThreeVector &tlate, G4int handedness, const EAxis axis0, const EAxis axis1, G4double axis0min=-kInfinity, G4double axis1min=-kInfinity, G4double axis0max=kInfinity, G4double axis1max=kInfinity)
virtual	~G4VTwistSurface ()=default
virtual G4int	AmIOnLeftSide (const G4ThreeVector &me, const G4ThreeVector &vec, G4bool withTol=true)
virtual G4double	DistanceToBoundary (G4int areacode, G4ThreeVector &xx, const G4ThreeVector &p)
virtual G4double	DistanceToIn (const G4ThreeVector &gp, const G4ThreeVector &gv, G4ThreeVector &gxxbest)
virtual G4double	DistanceToOut (const G4ThreeVector &gp, const G4ThreeVector &gv, G4ThreeVector &gxxbest)
virtual G4double	DistanceTo (const G4ThreeVector &gp, G4ThreeVector &gxx)
virtual void	GetBoundaryParameters (const G4int &areacode, G4ThreeVector &d, G4ThreeVector &x0, G4int &boundarytype) const
virtual G4ThreeVector	GetBoundaryAtPZ (G4int areacode, const G4ThreeVector &p) const
G4double	DistanceToPlaneWithV (const G4ThreeVector &p, const G4ThreeVector &v, const G4ThreeVector &x0, const G4ThreeVector &n0, G4ThreeVector &xx)
G4double	DistanceToPlane (const G4ThreeVector &p, const G4ThreeVector &x0, const G4ThreeVector &n0, G4ThreeVector &xx)
G4double	DistanceToPlane (const G4ThreeVector &p, const G4ThreeVector &x0, const G4ThreeVector &t1, const G4ThreeVector &t2, G4ThreeVector &xx, G4ThreeVector &n)
G4double	DistanceToLine (const G4ThreeVector &p, const G4ThreeVector &x0, const G4ThreeVector &d, G4ThreeVector &xx)
G4bool	IsAxis0 (G4int areacode) const
G4bool	IsAxis1 (G4int areacode) const
G4bool	IsOutside (G4int areacode) const
G4bool	IsInside (G4int areacode, G4bool testbitmode=false) const
G4bool	IsBoundary (G4int areacode, G4bool testbitmode=false) const
G4bool	IsCorner (G4int areacode, G4bool testbitmode=false) const
G4bool	IsValidNorm () const
G4bool	IsSameBoundary (G4VTwistSurface *surface1, G4int areacode1, G4VTwistSurface *surface2, G4int areacode2) const
G4int	GetAxisType (G4int areacode, G4int whichaxis) const
G4ThreeVector	ComputeGlobalPoint (const G4ThreeVector &lp) const
G4ThreeVector	ComputeLocalPoint (const G4ThreeVector &gp) const
G4ThreeVector	ComputeGlobalDirection (const G4ThreeVector &lp) const
G4ThreeVector	ComputeLocalDirection (const G4ThreeVector &gp) const
void	SetAxis (G4int i, const EAxis axis)
void	SetNeighbours (G4VTwistSurface *ax0min, G4VTwistSurface *ax1min, G4VTwistSurface *ax0max, G4VTwistSurface *ax1max)
G4int	GetNode (G4int i, G4int j, G4int m, G4int n, G4int iside)
G4int	GetFace (G4int i, G4int j, G4int m, G4int n, G4int iside)
G4int	GetEdgeVisibility (G4int i, G4int j, G4int m, G4int n, G4int number, G4int orientation)
const G4String &	GetName () const
void	DebugPrint () const
	G4VTwistSurface (__void__ &)

Additional Inherited Members
Public Types inherited from G4VTwistSurface
enum	EValidate { kDontValidate = 0 , kValidateWithTol = 1 , kValidateWithoutTol = 2 , kUninitialized = 3 }
Static Public Attributes inherited from G4VTwistSurface
static const G4int	sOutside = 0x00000000
static const G4int	sInside = 0x10000000
static const G4int	sBoundary = 0x20000000
static const G4int	sCorner = 0x40000000
static const G4int	sC0Min1Min = 0x40000101
static const G4int	sC0Max1Min = 0x40000201
static const G4int	sC0Max1Max = 0x40000202
static const G4int	sC0Min1Max = 0x40000102
static const G4int	sAxisMin = 0x00000101
static const G4int	sAxisMax = 0x00000202
static const G4int	sAxisX = 0x00000404
static const G4int	sAxisY = 0x00000808
static const G4int	sAxisZ = 0x00000C0C
static const G4int	sAxisRho = 0x00001010
static const G4int	sAxisPhi = 0x00001414
static const G4int	sAxis0 = 0x0000FF00
static const G4int	sAxis1 = 0x000000FF
static const G4int	sSizeMask = 0x00000303
static const G4int	sAxisMask = 0x0000FCFC
static const G4int	sAreaMask = 0XF0000000
Protected Member Functions inherited from G4VTwistSurface
G4VTwistSurface **	GetNeighbours ()
G4int	GetNeighbours (G4int areacode, G4VTwistSurface *surfaces[])
G4ThreeVector	GetCorner (G4int areacode) const
void	GetBoundaryAxis (G4int areacode, EAxis axis[]) const
void	GetBoundaryLimit (G4int areacode, G4double limit[]) const
virtual void	SetBoundary (const G4int &axiscode, const G4ThreeVector &direction, const G4ThreeVector &x0, const G4int &boundarytype)
void	SetCorner (G4int areacode, G4double x, G4double y, G4double z)
Protected Attributes inherited from G4VTwistSurface
EAxis	fAxis [2]
G4double	fAxisMin [2]
G4double	fAxisMax [2]
CurrentStatus	fCurStatWithV
CurrentStatus	fCurStat
G4RotationMatrix	fRot
G4ThreeVector	fTrans
G4int	fHandedness
G4SurfCurNormal	fCurrentNormal
G4bool	fIsValidNorm
G4double	kCarTolerance

Detailed Description

G4TwistTubsHypeSide describes hyperbolic boundary surface for a cylinder.

Definition at line 48 of file G4TwistTubsHypeSide.hh.

Constructor & Destructor Documentation

G4TwistTubsHypeSide() [1/3]

G4TwistTubsHypeSide::G4TwistTubsHypeSide	(	const G4String &	name,
		const G4RotationMatrix &	rot,
		const G4ThreeVector &	tlate,
		const G4int	handedness,
		const G4double	kappa,
		const G4double	tanstereo,
		const G4double	r0,
		const EAxis	axis0 = kPhi,
		const EAxis	axis1 = kZAxis,
		G4double	axis0min = -kInfinity,
		G4double	axis1min = -kInfinity,
		G4double	axis0max = kInfinity,
		G4double	axis1max = kInfinity )

Constructs a cylinder hyperbolic boundary surface, given its parameters.

Parameters

[in]	name	The surface name.
[in]	rot	Rotation: 0.5*(phi-width segment).
[in]	tlate	Translation.
[in]	handedness	Orientation: R-hand = 1, L-hand = -1.
[in]	kappa	Kappa=tan(TwistAngle/2)/fZHalfLen.
[in]	tanstereo	Tangent of the stereo angle.
[in]	r0	Radius at z = 0.
[in]	axis0	Phi axis.
[in]	axis1	Z axis.
[in]	axis0min	Minimum in Phi.
[in]	axis1min	Minimum in Z.
[in]	axis0max	Maximum in Phi.
[in]	axis1max	Maximum in Z.

Definition at line 40 of file G4TwistTubsHypeSide.cc.

  : G4VTwistSurface(name, rot, tlate, handedness, axis0, axis1,
                    axis0min, axis1min, axis0max, axis1max),
    fKappa(kappa), fTanStereo(tanstereo),
    fTan2Stereo(tanstereo*tanstereo), fR0(r0), fR02(r0*r0), fDPhi(twopi)
{
   if ( (axis0 == kZAxis) && (axis1 == kPhi) )
   {
      G4Exception("G4TwistTubsHypeSide::G4TwistTubsHypeSide()",
                  "GeomSolids0002", FatalErrorInArgument,
                  "Should swap axis0 and axis1!");
   }
   fInside.gp.set(kInfinity, kInfinity, kInfinity);
   fInside.inside = kOutside;
   fIsValidNorm = false;
   SetCorners();
   SetBoundaries();
}

G4TwistTubsHypeSide() [2/3]

G4TwistTubsHypeSide::G4TwistTubsHypeSide	(	const G4String &	name,
		G4double	EndInnerRadius[2],
		G4double	EndOuterRadius[2],
		G4double	DPhi,
		G4double	EndPhi[2],
		G4double	EndZ[2],
		G4double	InnerRadius,
		G4double	OuterRadius,
		G4double	Kappa,
		G4double	TanInnerStereo,
		G4double	TanOuterStereo,
		G4int	handedness )

Alternative Construct for a cylinder hyperbolic boundary surface.

Parameters

[in]	name	The surface name.
[in]	EndInnerRadius	Inner-hype radius at z=0.
[in]	EndOuterRadius	Outer-hype radius at z=0.
[in]	DPhi	Phi angle.
[in]	EndPhi	Total Phi.
[in]	EndZ	Z length.
[in]	InnerRadius	Inner radius.
[in]	OuterRadius	Outer radius.
[in]	Kappa	Kappa=tan(TwistAngle/2)/fZHalfLen.
[in]	TanInnerStereo	Tangent inner stereo angle.
[in]	TanOuterStereo	Tangent outer stereo angle.
[in]	handedness	Orientation: R-hand = 1, L-hand = -1.

Definition at line 71 of file G4TwistTubsHypeSide.cc.

   : G4VTwistSurface(name)
{
 
   fHandedness = handedness;   // +z = +ve, -z = -ve
   fAxis[0]    = kPhi;
   fAxis[1]    = kZAxis;
   fAxisMin[0] = kInfinity;         // we cannot fix boundary min of Phi, 
   fAxisMax[0] = kInfinity;         // because it depends on z.
   fAxisMin[1] = EndZ[0];
   fAxisMax[1] = EndZ[1];
   fKappa      = Kappa;
   fDPhi       = DPhi ;
 
   if (handedness < 0)  // inner hyperbolic surface
   {
      fTanStereo  = TanInnerStereo;
      fR0         = InnerRadius;
   }
   else                 // outer hyperbolic surface
   {
      fTanStereo  = TanOuterStereo;
      fR0         = OuterRadius;
   }
   fTan2Stereo = fTanStereo * fTanStereo;
   fR02        = fR0 * fR0;
   
   fTrans.set(0, 0, 0);
   fIsValidNorm = false;
 
   fInside.gp.set(kInfinity, kInfinity, kInfinity);
   fInside.inside = kOutside;
   
   SetCorners(EndInnerRadius, EndOuterRadius, DPhi, EndPhi, EndZ) ; 
 
   SetBoundaries();
}

~G4TwistTubsHypeSide()

G4TwistTubsHypeSide::~G4TwistTubsHypeSide ( )

overridedefault

Default destructor.

G4TwistTubsHypeSide() [3/3]

G4TwistTubsHypeSide::G4TwistTubsHypeSide

(

__void__ &

a

)

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

Definition at line 123 of file G4TwistTubsHypeSide.cc.

  : G4VTwistSurface(a)
{
}

Member Function Documentation

DistanceToSurface() [1/2]

G4int G4TwistTubsHypeSide::DistanceToSurface ( const G4ThreeVector & gp, const G4ThreeVector & gv, G4ThreeVector gxx[], G4double distance[], G4int areacode[], G4bool isvalid[], EValidate validate = kValidateWithTol )

overridevirtual

Returns the distance to surface, given point 'gp' and direction 'gv'.

Parameters

[in]	gp	The point from where computing the distance.
[in]	gv	The direction along which computing the distance.
[out]	gxx	Vector of global points based on number of solutions.
[out]	distance	The distance vector based on number of solutions.
[out]	areacode	The location vector based on number of solutions.
[out]	isvalid	Validity vector based on number of solutions.
[in]	validate	Adopted validation criteria.

Returns

The number of solutions.

Implements G4VTwistSurface.

Definition at line 243 of file G4TwistTubsHypeSide.cc.

{
   // Decide if and where a line intersects with a hyperbolic
   // surface (of infinite extent)
   //
   // Arguments:
   //     p       - (in) Point on trajectory
   //     v       - (in) Vector along trajectory
   //     r2      - (in) Square of radius at z = 0
   //     tan2phi - (in) std::tan(stereo)**2
   //     s       - (out) Up to two points of intersection, where the
   //                     intersection point is p + s*v, and if there are
   //                     two intersections, s[0] < s[1]. May be negative.
   // Returns:
   //     The number of intersections. If 0, the trajectory misses.
   //
   //
   // Equation of a line:
   //
   //       x = x0 + s*tx      y = y0 + s*ty      z = z0 + s*tz
   //
   // Equation of a hyperbolic surface:
   //
   //       x**2 + y**2 = r**2 + (z*tanPhi)**2
   //
   // Solution is quadratic:
   //
   //  a*s**2 + b*s + c = 0
   //
   // where:
   //
   //  a = tx**2 + ty**2 - (tz*tanPhi)**2
   //
   //  b = 2*( x0*tx + y0*ty - z0*tz*tanPhi**2 )
   //
   //  c = x0**2 + y0**2 - r**2 - (z0*tanPhi)**2
   //
      
   fCurStatWithV.ResetfDone(validate, &gp, &gv);
 
   if (fCurStatWithV.IsDone())
   {
      for (G4int i=0; i<fCurStatWithV.GetNXX(); ++i)
      {
         gxx[i] = fCurStatWithV.GetXX(i);
         distance[i] = fCurStatWithV.GetDistance(i);
         areacode[i] = fCurStatWithV.GetAreacode(i);
         isvalid[i]  = fCurStatWithV.IsValid(i);
      }
      return fCurStatWithV.GetNXX();
   }
 
   // initialize
   for (auto i=0; i<2; ++i)
   {
      distance[i] = kInfinity;
      areacode[i] = sOutside;
      isvalid[i]  = false;
      gxx[i].set(kInfinity, kInfinity, kInfinity);
   }
 
   G4ThreeVector p = ComputeLocalPoint(gp);
   G4ThreeVector v = ComputeLocalDirection(gv);
   G4ThreeVector xx[2]; 
   
   //
   // special case!  p is on origin.
   // 
 
   if (p.mag() == 0)
   {
      // p is origin. 
      // unique solution of 2-dimension question in r-z plane 
      // Equations:
      //    r^2 = fR02 + z^2*fTan2Stere0
      //    r = beta*z
      //        where 
      //        beta = vrho / vz
      // Solution (z value of intersection point):
      //    xxz = +- std::sqrt (fR02 / (beta^2 - fTan2Stereo))
      //
 
      G4double vz    = v.z();
      G4double absvz = std::fabs(vz);
      G4double vrho  = v.getRho();       
      G4double vslope = vrho/vz;
      G4double vslope2 = vslope * vslope;
      if (vrho == 0 || (vrho/absvz) <= (absvz*std::fabs(fTanStereo)/absvz))
      {
         // vz/vrho is bigger than slope of asymptonic line
         distance[0] = kInfinity;
         fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                        isvalid[0], 0, validate, &gp, &gv);
         return 0;
      }
       
      if (vz != 0.0)
      { 
         G4double xxz  = std::sqrt(fR02 / (vslope2 - fTan2Stereo)) 
                        * (vz / std::fabs(vz)) ;
         G4double t = xxz / vz;
         xx[0].set(t*v.x(), t*v.y(), xxz);
      }
      else
      {
         // p.z = 0 && v.z =0
         xx[0].set(v.x()*fR0, v.y()*fR0, 0);  // v is a unit vector.
      }
      distance[0] = xx[0].mag();
      gxx[0]      = ComputeGlobalPoint(xx[0]);
 
      if (validate == kValidateWithTol)
      {
         areacode[0] = GetAreaCode(xx[0]);
         if (!IsOutside(areacode[0]))
         {
            if (distance[0] >= 0) { isvalid[0] = true; }
         }
      }
      else if (validate == kValidateWithoutTol)
      {
         areacode[0] = GetAreaCode(xx[0], false);
         if (IsInside(areacode[0]))
         {
            if (distance[0] >= 0) { isvalid[0] = true; }
         }
      }
      else  // kDontValidate                       
      {
         areacode[0] = sInside;
            if (distance[0] >= 0) { isvalid[0] = true; }
      }
                 
      fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                     isvalid[0], 1, validate, &gp, &gv);
      return 1;
   }
 
   //
   // special case end.
   // 
 
   G4double a = v.x()*v.x() + v.y()*v.y() - v.z()*v.z()*fTan2Stereo;
   G4double b = 2.0
              * ( p.x() * v.x() + p.y() * v.y() - p.z() * v.z() * fTan2Stereo );
   G4double c = p.x()*p.x() + p.y()*p.y() - fR02 - p.z()*p.z()*fTan2Stereo;
   G4double D = b*b - 4*a*c;          //discriminant
   G4int vout = 0;
   
   if (std::fabs(a) < DBL_MIN)
   {
      if (std::fabs(b) > DBL_MIN)            // single solution
      {
         distance[0] = -c/b;
         xx[0] = p + distance[0]*v;
         gxx[0] = ComputeGlobalPoint(xx[0]);
 
         if (validate == kValidateWithTol)
         {
            areacode[0] = GetAreaCode(xx[0]);
            if (!IsOutside(areacode[0]))
            {
               if (distance[0] >= 0) { isvalid[0] = true; }
            }
         }
         else if (validate == kValidateWithoutTol)
         {
            areacode[0] = GetAreaCode(xx[0], false);
            if (IsInside(areacode[0]))
            {
               if (distance[0] >= 0) { isvalid[0] = true; }
            }
         }
         else  // kDontValidate                       
         {
            areacode[0] = sInside;
               if (distance[0] >= 0) { isvalid[0] = true; }
         }
                 
         fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                        isvalid[0], 1, validate, &gp, &gv);
         vout = 1;
      }
      else
      {
        // if a=b=0 and c != 0, p is origin and v is parallel to asymptotic line
        // if a=b=c=0, p is on surface and v is paralell to stereo wire.
        // return distance = infinity
 
         fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                        isvalid[0], 0, validate, &gp, &gv);
         vout = 0;
      }
   }
   else if (D > DBL_MIN)          // double solutions
   {
      D = std::sqrt(D);
      G4double      factor = 0.5/a;
      G4double      tmpdist[2] = {kInfinity, kInfinity};
      G4ThreeVector tmpxx[2] ;
      G4int         tmpareacode[2] = {sOutside, sOutside};
      G4bool        tmpisvalid[2]  = {false, false};
 
      for (auto i=0; i<2; ++i)
      {
         tmpdist[i] = factor*(-b - D);
         D = -D;
         tmpxx[i] = p + tmpdist[i]*v;
        
         if (validate == kValidateWithTol)
         {
            tmpareacode[i] = GetAreaCode(tmpxx[i]);
            if (!IsOutside(tmpareacode[i]))
            {
               if (tmpdist[i] >= 0) { tmpisvalid[i] = true; }
               continue;
            }
         }
         else if (validate == kValidateWithoutTol)
         {
            tmpareacode[i] = GetAreaCode(tmpxx[i], false);
            if (IsInside(tmpareacode[i]))
            {
               if (tmpdist[i] >= 0) { tmpisvalid[i] = true; }
               continue;
            }
         }
         else  // kDontValidate
         {
            tmpareacode[i] = sInside;
               if (tmpdist[i] >= 0) { tmpisvalid[i] = true; }
            continue;
         }
      }      
 
      if (tmpdist[0] <= tmpdist[1])
      {
          distance[0] = tmpdist[0];
          distance[1] = tmpdist[1];
          xx[0]       = tmpxx[0];
          xx[1]       = tmpxx[1];
          gxx[0]      = ComputeGlobalPoint(tmpxx[0]);
          gxx[1]      = ComputeGlobalPoint(tmpxx[1]);
          areacode[0] = tmpareacode[0];
          areacode[1] = tmpareacode[1];
          isvalid[0]  = tmpisvalid[0];
          isvalid[1]  = tmpisvalid[1];
      }
      else
      {
          distance[0] = tmpdist[1];
          distance[1] = tmpdist[0];
          xx[0]       = tmpxx[1];
          xx[1]       = tmpxx[0];
          gxx[0]      = ComputeGlobalPoint(tmpxx[1]);
          gxx[1]      = ComputeGlobalPoint(tmpxx[0]);
          areacode[0] = tmpareacode[1];
          areacode[1] = tmpareacode[0];
          isvalid[0]  = tmpisvalid[1];
          isvalid[1]  = tmpisvalid[0];
      }
         
      fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                     isvalid[0], 2, validate, &gp, &gv);
      fCurStatWithV.SetCurrentStatus(1, gxx[1], distance[1], areacode[1],
                                     isvalid[1], 2, validate, &gp, &gv);
      vout = 2;
   }
   else
   {
      // if D<0, no solution
      // if D=0, just grazing the surfaces, return kInfinity
 
      fCurStatWithV.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                     isvalid[0], 0, validate, &gp, &gv);
      vout = 0;
   }
   return vout;
}

DistanceToSurface() [2/2]

G4int G4TwistTubsHypeSide::DistanceToSurface ( const G4ThreeVector & gp, G4ThreeVector gxx[], G4double distance[], G4int areacode[] )

overridevirtual

Returns the safety distance to surface, given point 'gp'.

Parameters

[in]	gp	The point from where computing the safety distance.
[out]	gxx	Vector of global points based on number of solutions.
[out]	distance	The distance vector based on number of solutions.
[out]	areacode	The location vector based on number of solutions.

Returns

The number of solutions.

Implements G4VTwistSurface.

Definition at line 532 of file G4TwistTubsHypeSide.cc.

{
    // Find the approximate distance of a point of a hyperbolic surface.
    // The distance must be an underestimate. 
    // It will also be nice (although not necessary) that the estimate is
    // always finite no matter how close the point is.
    //
    // We arranged G4Hype::ApproxDistOutside and G4Hype::ApproxDistInside
    // for this function. See these discriptions.
    
   const G4double halftol
     = 0.5 * G4GeometryTolerance::GetInstance()->GetRadialTolerance();
 
   fCurStat.ResetfDone(kDontValidate, &gp);
 
   if (fCurStat.IsDone())
   {
      for (G4int i=0; i<fCurStat.GetNXX(); ++i)
      {
         gxx[i] = fCurStat.GetXX(i);
         distance[i] = fCurStat.GetDistance(i);
         areacode[i] = fCurStat.GetAreacode(i);
      }
      return fCurStat.GetNXX();
   }
 
   // initialize
   for (auto i=0; i<2; ++i)
   {
      distance[i] = kInfinity;
      areacode[i] = sOutside;
      gxx[i].set(kInfinity, kInfinity, kInfinity);
   }
 
   G4ThreeVector p = ComputeLocalPoint(gp);
   G4ThreeVector xx;
 
   //
   // special case!
   // If p is on surface, return distance = 0 immediatery .
   //
   G4ThreeVector  lastgxx[2];
   for (auto i=0; i<2; ++i)
   {
      lastgxx[i] = fCurStatWithV.GetXX(i);
   }
 
   if ((gp - lastgxx[0]).mag() < halftol || (gp - lastgxx[1]).mag() < halftol)
   {
      // last winner, or last poststep point is on the surface.
      xx = p;             
      gxx[0] = gp;
      distance[0] = 0;      
 
      G4bool isvalid = true;
      fCurStat.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                                isvalid, 1, kDontValidate, &gp);
 
      return 1;
   }
   //
   // special case end
   //
       
   G4double prho       = p.getRho();
   G4double pz         = std::fabs(p.z());           // use symmetry
   G4double r1         = std::sqrt(fR02 + pz * pz * fTan2Stereo);
   
   G4ThreeVector pabsz(p.x(), p.y(), pz);
    
   if (prho > r1 + halftol)   // p is outside of Hyperbolic surface
   {
      // First point xx1
      G4double t = r1 / prho;
      G4ThreeVector xx1(t * pabsz.x(), t * pabsz.y() , pz);
      
      // Second point xx2
      G4double z2 = (prho * fTanStereo + pz) / (1 + fTan2Stereo);
      G4double r2 = std::sqrt(fR02 + z2 * z2 * fTan2Stereo);
      t = r2 / prho;
      G4ThreeVector xx2(t * pabsz.x(), t * pabsz.y() , z2);
            
      G4double len = (xx2 - xx1).mag();
      if (len < DBL_MIN)
      {
         // xx2 = xx1?? I guess we
         // must have really bracketed the normal
         distance[0] = (pabsz - xx1).mag();
         xx = xx1;
      }
      else
      {
         distance[0] = DistanceToLine(pabsz, xx1, (xx2 - xx1) , xx);
      }
      
   }
   else if (prho < r1 - halftol)  // p is inside of Hyperbolic surface.
   {
      // First point xx1
      G4double t;
      G4ThreeVector xx1;
      if (prho < DBL_MIN)
      {
         xx1.set(r1, 0. , pz);
      }
      else
      {
         t = r1 / prho;
         xx1.set(t * pabsz.x(), t * pabsz.y() , pz);
      }
      
      // dr, dz is tangential vector of Hyparbolic surface at xx1
      // dr = r, dz = z*tan2stereo
      G4double dr  = pz * fTan2Stereo;
      G4double dz  = r1;
      G4double tanbeta   = dr / dz;
      G4double pztanbeta = pz * tanbeta;
      
      // Second point xx2 
      // xx2 is intersection between x-axis and tangential vector
      G4double r2 = r1 - pztanbeta;
      G4ThreeVector xx2;
      if (prho < DBL_MIN)
      {
         xx2.set(r2, 0. , 0.);
      }
      else
      {
         t  = r2 / prho;
         xx2.set(t * pabsz.x(), t * pabsz.y() , 0.);
      }
      
      G4ThreeVector d = xx2 - xx1;
      distance[0] = DistanceToLine(pabsz, xx1, d, xx);
          
   }
   else   // p is on Hyperbolic surface.
   {
      distance[0] = 0;
      xx.set(p.x(), p.y(), pz);
   }
 
   if (p.z() < 0)
   {
      G4ThreeVector tmpxx(xx.x(), xx.y(), -xx.z());
      xx = tmpxx;
   }
       
   gxx[0] = ComputeGlobalPoint(xx);
   areacode[0]    = sInside;
   G4bool isvalid = true;
   fCurStat.SetCurrentStatus(0, gxx[0], distance[0], areacode[0],
                             isvalid, 1, kDontValidate, &gp);
   return 1;
}

GetNormal()

G4ThreeVector G4TwistTubsHypeSide::GetNormal ( const G4ThreeVector & p, G4bool isGlobal = false )

overridevirtual

Returns a normal vector at a surface (or very close to the surface) point at 'p'.

Parameters

[in]	p	The point where computing the normal.
[in]	isGlobal	If true, it returns the normal in global coordinates.

Returns

The normal vector.

Implements G4VTwistSurface.

Definition at line 131 of file G4TwistTubsHypeSide.cc.

{
   // GetNormal returns a normal vector at a surface (or very close
   // to surface) point at tmpxx.
   // If isGlobal=true, it returns the normal in global coordinate.
   
   G4ThreeVector xx;
   if (isGlobal)
   {
      xx = ComputeLocalPoint(tmpxx);
      if ((xx - fCurrentNormal.p).mag() < 0.5 * kCarTolerance)
      {
         return ComputeGlobalDirection(fCurrentNormal.normal);
      }
   }
   else
   {
      xx = tmpxx;
      if (xx == fCurrentNormal.p)
      {
         return fCurrentNormal.normal;
      }
   }
   
   fCurrentNormal.p = xx;
 
   G4ThreeVector normal( xx.x(), xx.y(), -xx.z() * fTan2Stereo);
   normal *= fHandedness;
   normal = normal.unit();
 
   if (isGlobal)
   {
      fCurrentNormal.normal = ComputeLocalDirection(normal);
   }
   else
   {
      fCurrentNormal.normal = normal;
   }
   return fCurrentNormal.normal;
}

GetRhoAtPZ()

G4double G4TwistTubsHypeSide::GetRhoAtPZ ( const G4ThreeVector & p, G4bool isglobal = false ) const

inline

Gets Rho at p.z() on Hyperbolic Surface.

Definition at line 235 of file G4TwistTubsHypeSide.hh.

{
  // Get Rho at p.z() on Hyperbolic Surface.
  G4ThreeVector tmpp;
  if (isglobal) { tmpp = fRot.inverse()*p - fTrans; }
  else          { tmpp = p; }
 
  return std::sqrt(fR02 + tmpp.z() * tmpp.z() * fTan2Stereo); 
}

Referenced by Inside().

Inside()

EInside G4TwistTubsHypeSide::Inside

(

const G4ThreeVector &

gp

)

Returns if point at 'gp' is inside surface.

Definition at line 176 of file G4TwistTubsHypeSide.cc.

{
   // Inside returns 
   const G4double halftol
     = 0.5 * G4GeometryTolerance::GetInstance()->GetRadialTolerance();
 
   if (fInside.gp == gp)
   {
      return fInside.inside;
   }
   fInside.gp = gp;
   
   G4ThreeVector p = ComputeLocalPoint(gp);
  
 
   if (p.mag() < DBL_MIN)
   {
      fInside.inside = kOutside;
      return fInside.inside;
   }
   
   G4double rhohype = GetRhoAtPZ(p);
   G4double distanceToOut = fHandedness * (rhohype - p.getRho());
                            // +ve : inside
 
   if (distanceToOut < -halftol)
   {
     fInside.inside = kOutside;
   }
   else
   {
      G4int areacode = GetAreaCode(p);
      if (IsOutside(areacode))
      {
         fInside.inside = kOutside;
      }
      else if (IsBoundary(areacode))
      {
         fInside.inside = kSurface;
      }
      else if (IsInside(areacode))
      {
         if (distanceToOut <= halftol)
         {
            fInside.inside = kSurface;
         }
         else
         {
            fInside.inside = kInside;
         }
      }
      else
      {
         G4cout << "WARNING - G4TwistTubsHypeSide::Inside()" << G4endl
                << "          Invalid option !" << G4endl
                << "          name, areacode, distanceToOut = "
                << GetName() << ", " << std::hex << areacode
                << std::dec << ", " << distanceToOut << G4endl;
      }
   }
 
   return fInside.inside; 
}

---

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

• G4TwistTubsHypeSide.hh
• G4TwistTubsHypeSide.cc