G4GenericTrap Class Reference

#include <G4GenericTrap.hh>

Inheritance diagram for G4GenericTrap:

Public Member Functions
	G4GenericTrap (const G4String &name, G4double halfZ, const std::vector< G4TwoVector > &vertices)
	~G4GenericTrap () override
G4double	GetZHalfLength () const
G4int	GetNofVertices () const
G4TwoVector	GetVertex (G4int index) const
const std::vector< G4TwoVector > &	GetVertices () const
G4double	GetTwistAngle (G4int index) const
G4bool	IsTwisted () const
G4int	GetVisSubdivisions () const
void	SetVisSubdivisions (G4int subdiv)
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
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
G4GeometryType	GetEntityType () const override
G4VSolid *	Clone () const override
std::ostream &	StreamInfo (std::ostream &os) const override
G4ThreeVector	GetPointOnSurface () const override
G4double	GetCubicVolume () override
G4double	GetSurfaceArea () override
G4Polyhedron *	GetPolyhedron () const override
void	DescribeYourselfTo (G4VGraphicsScene &scene) const override
G4VisExtent	GetExtent () const override
G4Polyhedron *	CreatePolyhedron () const override
	G4GenericTrap (__void__ &)
	G4GenericTrap (const G4GenericTrap &rhs)
G4GenericTrap &	operator= (const G4GenericTrap &rhs)
Public Member Functions inherited from G4VSolid
	G4VSolid (const G4String &name)
virtual	~G4VSolid ()
G4bool	operator== (const G4VSolid &s) const
G4String	GetName () const
void	SetName (const G4String &name)
G4double	GetTolerance () const
virtual void	ComputeDimensions (G4VPVParameterisation *p, const G4int n, const G4VPhysicalVolume *pRep)
void	DumpInfo () const
virtual const G4VSolid *	GetConstituentSolid (G4int no) const
virtual G4VSolid *	GetConstituentSolid (G4int no)
virtual const G4DisplacedSolid *	GetDisplacedSolidPtr () const
virtual G4DisplacedSolid *	GetDisplacedSolidPtr ()
	G4VSolid (__void__ &)
	G4VSolid (const G4VSolid &rhs)
G4VSolid &	operator= (const G4VSolid &rhs)
G4double	EstimateCubicVolume (G4int nStat, G4double epsilon) const
G4double	EstimateSurfaceArea (G4int nStat, G4double ell) const

Protected Attributes
G4bool	fRebuildPolyhedron = false
G4Polyhedron *	fpPolyhedron = nullptr
Protected Attributes inherited from G4VSolid
G4double	kCarTolerance

Additional Inherited Members
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

Detailed Description

Definition at line 79 of file G4GenericTrap.hh.

Constructor & Destructor Documentation

G4GenericTrap() [1/3]

G4GenericTrap::G4GenericTrap	(	const G4String &	name,
		G4double	halfZ,
		const std::vector< G4TwoVector > &	vertices )

Definition at line 64 of file G4GenericTrap.cc.

  : G4VSolid(name), fDz(halfZ), fVertices(),
    fMinBBoxVector(G4ThreeVector(0,0,0)), fMaxBBoxVector(G4ThreeVector(0,0,0))
{
  // General constructor
  const G4double min_length=5*1.e-6;
  G4double length = 0.;
  G4int k=0;
  G4String errorDescription = "InvalidSetup in \" ";
  errorDescription += name;
  errorDescription += "\""; 
 
  halfCarTolerance = kCarTolerance*0.5;
 
  // Check vertices size
 
  if ( G4int(vertices.size()) != fgkNofVertices )
  {
    G4Exception("G4GenericTrap::G4GenericTrap()", "GeomSolids0002",
                FatalErrorInArgument, "Number of vertices != 8");
  }            
  
  // Check dZ
  // 
  if (halfZ < kCarTolerance)
  {
     G4Exception("G4GenericTrap::G4GenericTrap()", "GeomSolids0002",
                FatalErrorInArgument, "dZ is too small or negative");
  }           
 
  // Check Ordering and Copy vertices 
  //
  if(CheckOrder(vertices))
  {
    for (G4int i=0; i<fgkNofVertices; ++i) {fVertices.push_back(vertices[i]);}
  }
  else
  { 
    for (auto i=0; i <4; ++i) {fVertices.push_back(vertices[3-i]);}
    for (auto i=0; i <4; ++i) {fVertices.push_back(vertices[7-i]);}
  }
 
   // Check length of segments and Adjust
  // 
  for (auto j=0; j<2; ++j)
  {
    for (auto i=1; i<4; ++i)
    {
      k = j*4+i;
      length = (fVertices[k]-fVertices[k-1]).mag();
      if ( ( length < min_length) && ( length > kCarTolerance ) )
      {
        std::ostringstream message;
        message << "Length segment is too small." << G4endl
                << "Distance between " << fVertices[k-1] << " and "
                << fVertices[k] << " is only " << length << " mm !"; 
        G4Exception("G4GenericTrap::G4GenericTrap()", "GeomSolids1001",
                    JustWarning, message, "Vertices will be collapsed.");
        fVertices[k]=fVertices[k-1];
      }
    }
  }
 
  // Compute Twist
  //
  for(G4double & i : fTwist) { i=0.; }
  fIsTwisted = ComputeIsTwisted();
 
  // Compute Bounding Box 
  //
  ComputeBBox();
  
  // If not twisted - create tessellated solid 
  // (an alternative implementation for testing)
  //
#ifdef G4TESS_TEST
   if ( !fIsTwisted )  { fTessellatedSolid = CreateTessellatedSolid(); }
#endif
}

Referenced by Clone().

~G4GenericTrap()

G4GenericTrap::~G4GenericTrap ( )

override

Definition at line 157 of file G4GenericTrap.cc.

{
  delete fTessellatedSolid;
}

G4GenericTrap() [2/3]

G4GenericTrap::G4GenericTrap

(

__void__ &

a

)

Definition at line 147 of file G4GenericTrap.cc.

  : G4VSolid(a), halfCarTolerance(0.), fDz(0.), fVertices(),
    fMinBBoxVector(G4ThreeVector(0,0,0)), fMaxBBoxVector(G4ThreeVector(0,0,0))
{
  // Fake default constructor - sets only member data and allocates memory
  //                            for usage restricted to object persistency.
}

G4GenericTrap() [3/3]

G4GenericTrap::G4GenericTrap

(

const G4GenericTrap &

rhs

)

Definition at line 164 of file G4GenericTrap.cc.

  : G4VSolid(rhs),
    halfCarTolerance(rhs.halfCarTolerance),
    fDz(rhs.fDz), fVertices(rhs.fVertices),
    fIsTwisted(rhs.fIsTwisted),
    fMinBBoxVector(rhs.fMinBBoxVector), fMaxBBoxVector(rhs.fMaxBBoxVector),
    fVisSubdivisions(rhs.fVisSubdivisions),
    fSurfaceArea(rhs.fSurfaceArea), fCubicVolume(rhs.fCubicVolume) 
{
   for (auto i=0; i<4; ++i)  { fTwist[i] = rhs.fTwist[i]; }
#ifdef G4TESS_TEST
   if (rhs.fTessellatedSolid && !fIsTwisted )
   { fTessellatedSolid = CreateTessellatedSolid(); } 
#endif
}

Member Function Documentation

BoundingLimits()

void G4GenericTrap::BoundingLimits ( G4ThreeVector & pMin, G4ThreeVector & pMax ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1175 of file G4GenericTrap.cc.

{
  pMin = GetMinimumBBox();
  pMax = GetMaximumBBox();
 
  // 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("G4GenericTrap::BoundingLimits()", "GeomMgt0001",
                JustWarning, message);
    DumpInfo();
  }
}

Referenced by CalculateExtent().

CalculateExtent()

G4bool G4GenericTrap::CalculateExtent ( const EAxis pAxis, const G4VoxelLimits & pVoxelLimit, const G4AffineTransform & pTransform, G4double & pmin, G4double & pmax ) const

overridevirtual

Implements G4VSolid.

Definition at line 1199 of file G4GenericTrap.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
  //
  // To build the bounding envelope with plane faces each side face of
  // the trapezoid is subdivided in triangles. Subdivision is done by
  // duplication of vertices in the bases in a way that the envelope be
  // a convex polyhedron (some faces of the envelope can be degenerate)
  //
  G4double dz = GetZHalfLength();
  G4ThreeVectorList baseA(8), baseB(8);
  for (G4int i=0; i<4; ++i)
  {
    G4TwoVector va = GetVertex(i);
    G4TwoVector vb = GetVertex(i+4);
    baseA[2*i].set(va.x(),va.y(),-dz);
    baseB[2*i].set(vb.x(),vb.y(), dz);
  }
  for (G4int i=0; i<4; ++i)
  {
    G4int k1=2*i, k2=(2*i+2)%8;
    G4double ax = (baseA[k2].x()-baseA[k1].x());
    G4double ay = (baseA[k2].y()-baseA[k1].y());
    G4double bx = (baseB[k2].x()-baseB[k1].x());
    G4double by = (baseB[k2].y()-baseB[k1].y());
    G4double znorm = ax*by - ay*bx;
    baseA[k1+1] = (znorm < 0.0) ? baseA[k2] : baseA[k1];
    baseB[k1+1] = (znorm < 0.0) ? baseB[k1] : baseB[k2];
  }
 
  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 * G4GenericTrap::Clone ( ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1265 of file G4GenericTrap.cc.

{
  return new G4GenericTrap(*this);
}

CreatePolyhedron()

G4Polyhedron * G4GenericTrap::CreatePolyhedron ( ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 2012 of file G4GenericTrap.cc.

{
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid != nullptr )
  { 
    return fTessellatedSolid->CreatePolyhedron();
  }  
#endif 
 
  // Approximation of Twisted Side
  // Construct extra Points, if Twisted Side
  //
  G4Polyhedron* polyhedron;
  G4int nVertices, nFacets;
 
  G4int subdivisions = 0;
  if (fIsTwisted)
  {
    if (GetVisSubdivisions() != 0)
    {
      subdivisions = GetVisSubdivisions();
    }
    else
    {
      // Estimation of Number of Subdivisions for smooth visualisation
      //
      G4double maxTwist = 0.;
      for(G4int i = 0; i < 4; ++i)
      {
        if (GetTwistAngle(i) > maxTwist) { maxTwist = GetTwistAngle(i); }
      }
 
      // Computes bounding vectors for the shape
      //
      G4double Dx, Dy;
      G4ThreeVector minVec = GetMinimumBBox();
      G4ThreeVector maxVec = GetMaximumBBox();
      Dx = 0.5*(maxVec.x() - minVec.y());
      Dy = 0.5*(maxVec.y() - minVec.y());
      if (Dy > Dx) { Dx = Dy; }
 
      subdivisions = 8*G4int(maxTwist/(Dx*Dx*Dx)*fDz);
      if (subdivisions < 4)  { subdivisions = 4; }
      if (subdivisions > 30) { subdivisions = 30; }
    }
  }
  G4int sub4 = 4*subdivisions;
  nVertices = 8 + subdivisions*4;
  nFacets = 6 + subdivisions*4;
  G4double cf = 1./(subdivisions + 1);
  polyhedron = new G4Polyhedron(nVertices, nFacets);
 
  // Set vertices
  //
  G4int icur = 0;
  for (G4int i = 0; i < 4; ++i)
  {
    G4ThreeVector v(fVertices[i].x(),fVertices[i].y(),-fDz);
    polyhedron->SetVertex(++icur, v);
  }
  for (G4int i = 0; i < subdivisions; ++i)
  {
    for (G4int j = 0; j < 4; ++j)
    {
      G4TwoVector u = fVertices[j]+cf*(i+1)*(fVertices[j+4]-fVertices[j]);
      G4ThreeVector v(u.x(),u.y(),-fDz+cf*2*fDz*(i+1));
      polyhedron->SetVertex(++icur, v);
    }
  }
  for (G4int i = 4; i < 8; ++i)
  {
    G4ThreeVector v(fVertices[i].x(),fVertices[i].y(),fDz);
    polyhedron->SetVertex(++icur, v);
  }
 
  // Set facets
  //
  icur = 0;
  polyhedron->SetFacet(++icur, 1, 4, 3, 2); // Z-plane
  for (G4int i = 0; i < subdivisions + 1; ++i)
  {
    G4int is = i*4;
    polyhedron->SetFacet(++icur, 5+is, 8+is, 4+is, 1+is);
    polyhedron->SetFacet(++icur, 8+is, 7+is, 3+is, 4+is);
    polyhedron->SetFacet(++icur, 7+is, 6+is, 2+is, 3+is);
    polyhedron->SetFacet(++icur, 6+is, 5+is, 1+is, 2+is);
  }
  polyhedron->SetFacet(++icur, 5+sub4, 6+sub4, 7+sub4, 8+sub4); // Z-plane
 
  polyhedron->SetReferences();
  polyhedron->InvertFacets();
 
  return polyhedron;
}

Referenced by GetPolyhedron().

DescribeYourselfTo()

void G4GenericTrap::DescribeYourselfTo ( G4VGraphicsScene & scene ) const

overridevirtual

Implements G4VSolid.

Definition at line 1977 of file G4GenericTrap.cc.

{
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->DescribeYourselfTo(scene);
  }
#endif  
  
  scene.AddSolid(*this);
}

DistanceToIn() [1/2]

G4double G4GenericTrap::DistanceToIn ( const G4ThreeVector & p ) const

overridevirtual

Implements G4VSolid.

Definition at line 799 of file G4GenericTrap.cc.

{
  // Computes the closest distance from given point to this shape
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  {
    return fTessellatedSolid->DistanceToIn(p);
  }  
#endif
 
  G4double safz = std::fabs(p.z())-fDz;
  if(safz<0) { safz=0; }
 
  G4int iseg;
  G4double safe  = safz;
  G4double safxy = safz;
 
  for (iseg=0; iseg<4; ++iseg)
  { 
    safxy = SafetyToFace(p,iseg);
    if (safxy>safe)  { safe=safxy; }
  }
 
  return safe;
}

DistanceToIn() [2/2]

G4double G4GenericTrap::DistanceToIn ( const G4ThreeVector & p, const G4ThreeVector & v ) const

overridevirtual

Implements G4VSolid.

Definition at line 731 of file G4GenericTrap.cc.

{
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->DistanceToIn(p, v);
  }  
#endif
    
  G4double dist[5];
  G4ThreeVector n;
 
  // Check lateral faces
  //
  G4int i;
  for (i=0; i<4; ++i)
  {
    dist[i]=DistToPlane(p, v, i);  
  }
 
  // Check Z planes
  //
  dist[4]=kInfinity;
  if (std::fabs(p.z())>fDz-halfCarTolerance)
  {
    if (v.z() != 0.0)
    {
      G4ThreeVector pt;
      if (p.z()>0)
      {
        dist[4] = (fDz-p.z())/v.z();
      }
      else
      {   
        dist[4] = (-fDz-p.z())/v.z();
      }   
      if (dist[4]<-halfCarTolerance)
      {
        dist[4]=kInfinity;
      }
      else
      {
        if(dist[4]<halfCarTolerance)
        {
          if(p.z()>0)  { n=G4ThreeVector(0,0,1); }
          else         { n=G4ThreeVector(0,0,-1); }
          if (n.dot(v)<0) { dist[4]=0.; }
          else            { dist[4]=kInfinity; }
        }
        pt=p+dist[4]*v;
        if (Inside(pt)==kOutside)  { dist[4]=kInfinity; }
      }
    }
  }   
  G4double distmin = dist[0];
  for (i=1; i<5 ; ++i)
  {
    if (dist[i] < distmin)  { distmin = dist[i]; }
  }
 
  if (distmin<halfCarTolerance)  { distmin=0.; }
 
  return distmin;
}    

DistanceToOut() [1/2]

G4double G4GenericTrap::DistanceToOut ( const G4ThreeVector & p ) const

overridevirtual

Implements G4VSolid.

Definition at line 1148 of file G4GenericTrap.cc.

{
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->DistanceToOut(p);
  }  
#endif
 
  G4double safz = fDz-std::fabs(p.z());
  if (safz<0) { safz = 0; }
 
  G4double safe  = safz;
  G4double safxy = safz;
 
  for (G4int iseg=0; iseg<4; ++iseg)
  { 
    safxy = std::fabs(SafetyToFace(p,iseg));
    if (safxy < safe)  { safe = safxy; }
  }
 
  return safe;
}    

DistanceToOut() [2/2]

G4double G4GenericTrap::DistanceToOut ( const G4ThreeVector & p, const G4ThreeVector & v, const G4bool calcNorm = false, G4bool * validNorm = nullptr, G4ThreeVector * n = nullptr ) const

overridevirtual

Implements G4VSolid.

Definition at line 903 of file G4GenericTrap.cc.

{
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->DistanceToOut(p, v, calcNorm, validNorm, n);
  }
#endif
 
  G4double distmin;
  G4bool lateral_cross = false;
  ESide side = kUndef;
 
  if (calcNorm)  { *validNorm = true; } // All normals are valid
 
  if (v.z() < 0)
  {
    distmin=(-fDz-p.z())/v.z();
    if (calcNorm) { side=kMZ; *n=G4ThreeVector(0,0,-1); }
  }
  else
  {
    if (v.z() > 0)
    { 
      distmin = (fDz-p.z())/v.z(); 
      if (calcNorm) { side=kPZ; *n=G4ThreeVector(0,0,1); } 
    }
    else            { distmin = kInfinity; }
  }      
 
  G4double dz2 =0.5/fDz;
  G4double xa,xb,xc,xd;
  G4double ya,yb,yc,yd;
 
  for (G4int ipl=0; ipl<4; ++ipl)
  {
    G4int j = (ipl+1)%4;
    xa=fVertices[ipl].x();
    ya=fVertices[ipl].y();
    xb=fVertices[ipl+4].x();
    yb=fVertices[ipl+4].y();
    xc=fVertices[j].x();
    yc=fVertices[j].y();
    xd=fVertices[4+j].x();
    yd=fVertices[4+j].y();
 
    if ( ((std::fabs(xb-xd)+std::fabs(yb-yd))<halfCarTolerance)
      || ((std::fabs(xa-xc)+std::fabs(ya-yc))<halfCarTolerance) )
    {
      G4double q=DistToTriangle(p,v,ipl) ;
      if ( (q>=0) && (q<distmin) )
      {
        distmin=q;
        lateral_cross=true;
        side=ESide(ipl+1);
      }
      continue;
    }
    G4double tx1 =dz2*(xb-xa);
    G4double ty1 =dz2*(yb-ya);
    G4double tx2 =dz2*(xd-xc);
    G4double ty2 =dz2*(yd-yc);
    G4double dzp =fDz+p.z();
    G4double xs1 =xa+tx1*dzp;
    G4double ys1 =ya+ty1*dzp;
    G4double xs2 =xc+tx2*dzp;
    G4double ys2 =yc+ty2*dzp;
    G4double dxs =xs2-xs1;
    G4double dys =ys2-ys1;
    G4double dtx =tx2-tx1;
    G4double dty =ty2-ty1;
    G4double a = (dtx*v.y()-dty*v.x()+(tx1*ty2-tx2*ty1)*v.z())*v.z();
    G4double b = dxs*v.y()-dys*v.x()+(dtx*p.y()-dty*p.x()+ty2*xs1-ty1*xs2
               + tx1*ys2-tx2*ys1)*v.z();
    G4double c=dxs*p.y()-dys*p.x()+xs1*ys2-xs2*ys1;
    G4double q=kInfinity;
 
    if (std::fabs(a) < kCarTolerance)
    {           
      if (std::fabs(b) < kCarTolerance) { continue; }
      q=-c/b;
         
      // Check for Point on the Surface
      //
      if ((q > -halfCarTolerance) && (q < distmin))
      {
        if (q < halfCarTolerance)
        {
          if (NormalToPlane(p,ipl).dot(v)<0.)  { continue; }
        }
        distmin =q;
        lateral_cross=true;
        side=ESide(ipl+1);
      }   
      continue;
    }
    G4double d=b*b-4*a*c;
    if (d >= 0.)
    {
      if (a > 0)  { q=0.5*(-b-std::sqrt(d))/a; }
      else        { q=0.5*(-b+std::sqrt(d))/a; }
 
      // Check for Point on the Surface
      //
      if (q > -halfCarTolerance )
      {
        if (q < distmin)
        {
          if(q < halfCarTolerance)
          {
            if (NormalToPlane(p,ipl).dot(v)<0.)  // Check second root
            {
              if (a > 0)  { q=0.5*(-b+std::sqrt(d))/a; }
              else        { q=0.5*(-b-std::sqrt(d))/a; }
              if (( q > halfCarTolerance) && (q < distmin))
              {
                distmin=q;
                lateral_cross = true;
                side=ESide(ipl+1);
              }
              continue;
            }
          }
          distmin = q;
          lateral_cross = true;
          side=ESide(ipl+1);
        }
      }
      else
      {
        if (a > 0)  { q=0.5*(-b+std::sqrt(d))/a; }
        else        { q=0.5*(-b-std::sqrt(d))/a; }
 
        // Check for Point on the Surface
        //
        if ((q > -halfCarTolerance) && (q < distmin))
        {
          if (q < halfCarTolerance)
          {
            if (NormalToPlane(p,ipl).dot(v)<0.)  // Check second root
            {
              if (a > 0)  { q=0.5*(-b-std::sqrt(d))/a; }
              else        { q=0.5*(-b+std::sqrt(d))/a; }
              if ( ( q > halfCarTolerance) && (q < distmin) )
              {
                distmin=q;
                lateral_cross = true;
                side=ESide(ipl+1);
              }
              continue;
            }  
          }
          distmin =q;
          lateral_cross = true;
          side=ESide(ipl+1);
        }   
      }
    }
  }
  if (!lateral_cross)  // Make sure that track crosses the top or bottom
  {
    if (distmin >= kInfinity)  { distmin=kCarTolerance; }
    G4ThreeVector pt=p+distmin*v;
    
    // Check if propagated point is in the polygon
    //
    G4int i=0;
    if (v.z()>0.) { i=4; }
    std::vector<G4TwoVector> xy;
    for ( G4int j=0; j<4; j++)  { xy.push_back(fVertices[i+j]); }
 
    // Check Inside
    //
    if (InsidePolygone(pt,xy)==kOutside)
    { 
      if(calcNorm)
      {
        if (v.z()>0) {side= kPZ; *n = G4ThreeVector(0,0,1);}
        else         { side=kMZ; *n = G4ThreeVector(0,0,-1);}
      } 
      return 0.;
    }
    else
    {
      if(v.z()>0) {side=kPZ;}
      else        {side=kMZ;}
    }
  }
 
  if (calcNorm)
  {
    G4ThreeVector pt=p+v*distmin;     
    switch (side)
    {
      case kXY0:
        *n=NormalToPlane(pt,0);
        break;
      case kXY1:
        *n=NormalToPlane(pt,1);
        break;
      case kXY2:
        *n=NormalToPlane(pt,2);
        break;
      case kXY3:
        *n=NormalToPlane(pt,3);
        break;
      case kPZ:
        *n=G4ThreeVector(0,0,1);
        break;
      case kMZ:
        *n=G4ThreeVector(0,0,-1);
        break;
      default:
        DumpInfo();
        std::ostringstream message;
        G4long oldprc = message.precision(16);
        message << "Undefined side for valid surface normal to solid." << G4endl
                << "Position:" << G4endl
                << "  p.x() = "   << p.x()/mm << " mm" << G4endl
                << "  p.y() = "   << p.y()/mm << " mm" << G4endl
                << "  p.z() = "   << p.z()/mm << " mm" << G4endl
                << "Direction:" << G4endl
                << "  v.x() = "   << v.x() << G4endl
                << "  v.y() = "   << v.y() << G4endl
                << "  v.z() = "   << v.z() << G4endl
                << "Proposed distance :" << G4endl
                << "  distmin = " << distmin/mm << " mm";
        message.precision(oldprc);
        G4Exception("G4GenericTrap::DistanceToOut(p,v,..)",
                    "GeomSolids1002", JustWarning, message);
        break;
     }
  }
 
  if (distmin<halfCarTolerance)  { distmin=0.; }
 
  return distmin;
}    

GetCubicVolume()

G4double G4GenericTrap::GetCubicVolume ( )

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1382 of file G4GenericTrap.cc.

{
  if (fCubicVolume == 0.0)
  {
    // diagonals
    G4TwoVector A = fVertices[3] - fVertices[1];
    G4TwoVector B = fVertices[2] - fVertices[0];
    G4TwoVector C = fVertices[7] - fVertices[5];
    G4TwoVector D = fVertices[6] - fVertices[4];
 
    // kross products
    G4double AB = A.x()*B.y() - A.y()*B.x();
    G4double CD = C.x()*D.y() - C.y()*D.x();
    G4double AD = A.x()*D.y() - A.y()*D.x();
    G4double CB = C.x()*B.y() - C.y()*B.x();
 
    fCubicVolume = ((AB + CD)/3. + (AD + CB)/6.)*fDz;
  }
  return fCubicVolume;
}

GetEntityType()

G4GeometryType G4GenericTrap::GetEntityType ( ) const

overridevirtual

Implements G4VSolid.

Definition at line 1258 of file G4GenericTrap.cc.

{
  return {"G4GenericTrap"};
}

Referenced by StreamInfo().

GetExtent()

G4VisExtent G4GenericTrap::GetExtent ( ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1992 of file G4GenericTrap.cc.

{
  // Computes bounding vectors for the shape
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid != nullptr )
  { 
    return fTessellatedSolid->GetExtent();
  } 
#endif
   
  G4ThreeVector minVec = GetMinimumBBox();
  G4ThreeVector maxVec = GetMaximumBBox();
  return { minVec.x(), maxVec.x(),
           minVec.y(), maxVec.y(),
           minVec.z(), maxVec.z() }; 
}    

GetNofVertices()

G4int G4GenericTrap::GetNofVertices ( ) const

inline

GetPointOnSurface()

G4ThreeVector G4GenericTrap::GetPointOnSurface ( ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1295 of file G4GenericTrap.cc.

{
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->GetPointOnSurface();
  }  
#endif
 
  G4ThreeVector point;
  G4TwoVector u,v,w;
  G4double rand,area,chose,cf,lambda0,lambda1,alfa,beta,zp;
  G4int ipl,j;
 
  std::vector<G4ThreeVector> vertices;
  for (auto i=0; i<4; ++i)
  {
    vertices.emplace_back(fVertices[i].x(),fVertices[i].y(),-fDz);
  }
  for (auto i=4; i<8; ++i)
  {
    vertices.emplace_back(fVertices[i].x(),fVertices[i].y(),fDz);
  }
 
  // Surface Area of Planes
  //
  G4TwoVector A = fVertices[3] - fVertices[1];
  G4TwoVector B = fVertices[2] - fVertices[0];
  G4TwoVector C = fVertices[7] - fVertices[5];
  G4TwoVector D = fVertices[6] - fVertices[4];
  G4double Surface0 = 0.5*(A.x()*B.y() - A.y()*B.x()); //-fDz plane
  G4double Surface1 = GetLateralFaceArea(0);
  G4double Surface2 = GetLateralFaceArea(1);
  G4double Surface3 = GetLateralFaceArea(2);
  G4double Surface4 = GetLateralFaceArea(3);
  G4double Surface5 = 0.5*(C.x()*D.y() - C.y()*D.x()); // fDz plane
 
  rand = G4UniformRand();
  area = Surface0+Surface1+Surface2+Surface3+Surface4+Surface5;
  chose = rand*area;
 
  if ( ( chose < Surface0)
    || ( chose > (Surface0+Surface1+Surface2+Surface3+Surface4)) )
  {                                        // fDz or -fDz Plane
    ipl = G4int(G4UniformRand()*4);
    j = (ipl+1)%4;
    if(chose < Surface0)
    { 
      zp = -fDz;
      u = fVertices[ipl]; v = fVertices[j];
      w = fVertices[(ipl+3)%4]; 
    }
    else
    {
      zp = fDz;
      u = fVertices[ipl+4]; v = fVertices[j+4];
      w = fVertices[(ipl+3)%4+4]; 
    }
    alfa = G4UniformRand();
    beta = G4UniformRand();
    lambda1=alfa*beta;
    lambda0=alfa-lambda1;
    v = v-u;
    w = w-u;
    v = u+lambda0*v+lambda1*w;
  }
  else                                     // Lateral Plane Twisted or Not
  {
    if (chose < Surface0+Surface1) { ipl=0; }
    else if (chose < Surface0+Surface1+Surface2) { ipl=1; }
    else if (chose < Surface0+Surface1+Surface2+Surface3) { ipl=2; }
    else { ipl=3; }
    j = (ipl+1)%4;
    zp = -fDz+G4UniformRand()*2*fDz;
    cf = 0.5*(fDz-zp)/fDz;
    u = fVertices[ipl+4]+cf*( fVertices[ipl]-fVertices[ipl+4]);
    v = fVertices[j+4]+cf*(fVertices[j]-fVertices[j+4]); 
    v = u+(v-u)*G4UniformRand();
  }
  point=G4ThreeVector(v.x(),v.y(),zp);
 
  return point;
}

GetPolyhedron()

G4Polyhedron * G4GenericTrap::GetPolyhedron ( ) const

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1951 of file G4GenericTrap.cc.

{
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  { 
    return fTessellatedSolid->GetPolyhedron();
  }
#endif  
  
  if ( (fpPolyhedron == nullptr)
    || fRebuildPolyhedron
    || (fpPolyhedron->GetNumberOfRotationStepsAtTimeOfCreation() !=
        fpPolyhedron->GetNumberOfRotationSteps()) )
  {
    G4AutoLock l(&polyhedronMutex);
    delete fpPolyhedron;
    fpPolyhedron = CreatePolyhedron();
    fRebuildPolyhedron = false;
    l.unlock();
  }
  return fpPolyhedron;
}    

GetSurfaceArea()

G4double G4GenericTrap::GetSurfaceArea ( )

overridevirtual

Reimplemented from G4VSolid.

Definition at line 1468 of file G4GenericTrap.cc.

{
  if (fSurfaceArea == 0.0)
  {
    G4TwoVector A = fVertices[3] - fVertices[1];
    G4TwoVector B = fVertices[2] - fVertices[0];
    G4TwoVector C = fVertices[7] - fVertices[5];
    G4TwoVector D = fVertices[6] - fVertices[4];
    G4double S_bot = 0.5*(A.x()*B.y() - A.y()*B.x());
    G4double S_top = 0.5*(C.x()*D.y() - C.y()*D.x());
    fSurfaceArea = S_bot + S_top +
                   GetLateralFaceArea(0) +
                   GetLateralFaceArea(1) +
                   GetLateralFaceArea(2) +
                   GetLateralFaceArea(3);
  }
  return fSurfaceArea;
}

GetTwistAngle()

G4double G4GenericTrap::GetTwistAngle ( G4int index ) const

inline

Referenced by CreatePolyhedron(), and SurfaceNormal().

GetVertex()

G4TwoVector G4GenericTrap::GetVertex ( G4int index ) const

inline

Referenced by CalculateExtent().

GetVertices()

const std::vector< G4TwoVector > & G4GenericTrap::GetVertices ( ) const

inline

Referenced by G4GDMLWriteSolids::GenTrapWrite().

GetVisSubdivisions()

G4int G4GenericTrap::GetVisSubdivisions ( ) const

inline

Referenced by CreatePolyhedron().

GetZHalfLength()

G4double G4GenericTrap::GetZHalfLength ( ) const

inline

Referenced by CalculateExtent(), and G4GDMLWriteSolids::GenTrapWrite().

Inside()

EInside G4GenericTrap::Inside ( const G4ThreeVector & p ) const

overridevirtual

Implements G4VSolid.

Definition at line 317 of file G4GenericTrap.cc.

{
  // Test if point is inside this shape
 
#ifdef G4TESS_TEST
   if ( fTessellatedSolid )
   { 
     return fTessellatedSolid->Inside(p);
   }
#endif  
 
  EInside innew=kOutside;
  std::vector<G4TwoVector> xy;
 
  if (std::fabs(p.z()) <= fDz+halfCarTolerance)  // First check Z range
  {
    // Compute intersection between Z plane containing point and the shape
    //
    G4double cf = 0.5*(fDz-p.z())/fDz;
    for (auto i=0; i<4; ++i)
    {
      xy.push_back(fVertices[i+4]+cf*( fVertices[i]-fVertices[i+4]));
    }
 
    innew=InsidePolygone(p,xy);
 
    if( (innew==kInside) || (innew==kSurface) )
    { 
      if(std::fabs(p.z()) > fDz-halfCarTolerance)  { innew=kSurface; }
    }
  }
  return innew;    
} 

Referenced by DistanceToIn().

IsTwisted()

G4bool G4GenericTrap::IsTwisted ( ) const

inline

operator=()

G4GenericTrap & G4GenericTrap::operator=

(

const G4GenericTrap &

rhs

)

Definition at line 182 of file G4GenericTrap.cc.

{
   // Check assignment to self
   //
   if (this == &rhs)  { return *this; }
 
   // Copy base class data
   //
   G4VSolid::operator=(rhs);
 
   // Copy data
   //
   halfCarTolerance = rhs.halfCarTolerance;
   fDz = rhs.fDz; fVertices = rhs.fVertices;
   fIsTwisted = rhs.fIsTwisted; fTessellatedSolid = nullptr;
   fMinBBoxVector = rhs.fMinBBoxVector; fMaxBBoxVector = rhs.fMaxBBoxVector;
   fVisSubdivisions = rhs.fVisSubdivisions;
   fSurfaceArea = rhs.fSurfaceArea; fCubicVolume = rhs.fCubicVolume;
 
   for (auto i=0; i<4; ++i)  { fTwist[i] = rhs.fTwist[i]; }
#ifdef G4TESS_TEST
   if (rhs.fTessellatedSolid && !fIsTwisted )
   { delete fTessellatedSolid; fTessellatedSolid = CreateTessellatedSolid(); } 
#endif
   fRebuildPolyhedron = false;
   delete fpPolyhedron; fpPolyhedron = nullptr;
 
   return *this;
}

SetVisSubdivisions()

void G4GenericTrap::SetVisSubdivisions ( G4int subdiv )

inline

StreamInfo()

std::ostream & G4GenericTrap::StreamInfo ( std::ostream & os ) const

overridevirtual

Implements G4VSolid.

Definition at line 1272 of file G4GenericTrap.cc.

{
  G4long oldprc = os.precision(16);
  os << "-----------------------------------------------------------\n"
     << "    *** Dump for solid - " << GetName() << " *** \n"
     << "    =================================================== \n"
     << " Solid geometry type: " << GetEntityType()  << G4endl
     << "   half length Z: " << fDz/mm << " mm \n"
     << "   list of vertices:\n";
     
  for ( G4int i=0; i<fgkNofVertices; ++i )
  {
    os << std::setw(5) << "#" << i 
       << "   vx = " << fVertices[i].x()/mm << " mm" 
       << "   vy = " << fVertices[i].y()/mm << " mm" << G4endl;
  }
  os.precision(oldprc);
 
  return os;
} 

SurfaceNormal()

G4ThreeVector G4GenericTrap::SurfaceNormal ( const G4ThreeVector & p ) const

overridevirtual

Implements G4VSolid.

Definition at line 353 of file G4GenericTrap.cc.

{
  // Calculate side nearest to p, and return normal
  // If two sides are equidistant, sum of the Normal is returned
 
#ifdef G4TESS_TEST
  if ( fTessellatedSolid )
  {
    return fTessellatedSolid->SurfaceNormal(p);
  }  
#endif   
 
  G4ThreeVector lnorm, sumnorm(0.,0.,0.), apprnorm(0.,0.,1.),
                p0, p1, p2, r1, r2, r3, r4;
  G4int noSurfaces = 0; 
  G4double distxy,distz;
  G4bool zPlusSide=false;
 
  distz = fDz-std::fabs(p.z());
  if (distz < halfCarTolerance)
  {
    if(p.z()>0)
    {
      zPlusSide=true;
      sumnorm=G4ThreeVector(0,0,1);
    }
    else
    {
      sumnorm=G4ThreeVector(0,0,-1);
    }
    ++noSurfaces;
  } 
 
  // Check lateral planes
  //
  std:: vector<G4TwoVector> vertices;  
  G4double cf = 0.5*(fDz-p.z())/fDz;
  for (auto i=0; i<4; ++i)
  {
    vertices.push_back(fVertices[i+4]+cf*(fVertices[i]-fVertices[i+4]));
  }
 
  // Compute distance for lateral planes
  //
  for (G4int q=0; q<4; ++q)
  {
    p0=G4ThreeVector(vertices[q].x(),vertices[q].y(),p.z());
    if(zPlusSide)
    {
      p1=G4ThreeVector(fVertices[q].x(),fVertices[q].y(),-fDz);
    }
    else
    {
      p1=G4ThreeVector(fVertices[q+4].x(),fVertices[q+4].y(),fDz); 
    }
    p2=G4ThreeVector(vertices[(q+1)%4].x(),vertices[(q+1)%4].y(),p.z());
 
    // Collapsed vertices
    //
    if ( (p2-p0).mag2() < kCarTolerance )
    {
      if ( std::fabs(p.z()+fDz) > kCarTolerance )
      {
        p2=G4ThreeVector(fVertices[(q+1)%4].x(),fVertices[(q+1)%4].y(),-fDz);
      }
      else
      {
        p2=G4ThreeVector(fVertices[(q+1)%4+4].x(),fVertices[(q+1)%4+4].y(),fDz);
      }
    }
    lnorm = (p1-p0).cross(p2-p0);
    lnorm = lnorm.unit();
    if(zPlusSide)  { lnorm=-lnorm; }
 
    // Adjust Normal for Twisted Surface
    //
    if ( (fIsTwisted) && (GetTwistAngle(q)!=0) )
    {
      G4double normP=(p2-p0).mag();
      if(normP != 0.0)
      {
        G4double proj=(p-p0).dot(p2-p0)/normP;
        if(proj<0)     { proj=0; }
        if(proj>normP) { proj=normP; }
        G4int j=(q+1)%4;
        r1=G4ThreeVector(fVertices[q+4].x(),fVertices[q+4].y(),fDz);
        r2=G4ThreeVector(fVertices[j+4].x(),fVertices[j+4].y(),fDz);
        r3=G4ThreeVector(fVertices[q].x(),fVertices[q].y(),-fDz);
        r4=G4ThreeVector(fVertices[j].x(),fVertices[j].y(),-fDz);
        r1=r1+proj*(r2-r1)/normP;
        r3=r3+proj*(r4-r3)/normP;
        r2=r1-r3;
        r4=r2.cross(p2-p0); r4=r4.unit();
        lnorm=r4;
      }
    }   // End if fIsTwisted
 
    distxy=std::fabs((p0-p).dot(lnorm));
    if ( distxy<halfCarTolerance )
    {
      ++noSurfaces;
 
      // Negative sign for Normal is taken for Outside Normal
      //
      sumnorm=sumnorm+lnorm;
    }
 
    // For ApproxSurfaceNormal
    //
    if (distxy<distz)
    {
      distz=distxy;
      apprnorm=lnorm;
    }      
  }  // End for loop
 
  // Calculate final Normal, add Normal in the Corners and Touching Sides
  //
  if ( noSurfaces == 0 )
  {
#ifdef G4SPECSDEBUG
    G4Exception("G4GenericTrap::SurfaceNormal(p)", "GeomSolids1002",
                JustWarning, "Point p is not on surface !?" );
#endif
    sumnorm=apprnorm;
    // Add Approximative Surface Normal Calculation?
  }
  else if ( noSurfaces == 1 )  { ; }
  else                         { sumnorm = sumnorm.unit(); }
 
  return sumnorm ; 
}    

Member Data Documentation

fpPolyhedron

G4Polyhedron* G4GenericTrap::fpPolyhedron = nullptr

mutableprotected

Definition at line 187 of file G4GenericTrap.hh.

Referenced by GetPolyhedron(), and operator=().

fRebuildPolyhedron

G4bool G4GenericTrap::fRebuildPolyhedron = false

mutableprotected

Definition at line 186 of file G4GenericTrap.hh.

Referenced by GetPolyhedron(), and operator=().

---

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

• G4GenericTrap.hh
• G4GenericTrap.cc