Geant4  10.02.p01
G4PolyPhiFace.icc
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27 // $Id: G4PolyPhiFace.icc 66356 2012-12-18 09:02:32Z gcosmo $
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30 // --------------------------------------------------------------------
31 // GEANT 4 inline definitions file
32 //
33 // G4PolyPhiFace.icc
34 //
35 // Implementation of inline methods of G4PolyPhiFace
36 // --------------------------------------------------------------------
37 
38 inline
39 G4VCSGface* G4PolyPhiFace::Clone()
40 {
41  return new G4PolyPhiFace(*this);
42 }
43 
44 // ExactZOrder
45 //
46 // Decide precisely whether a trajectory passes to the left, right, or exactly
47 // passes through the z position of a vertex point in our face.
48 //
49 // Result is only determined within an arbitrary (positive) factor.
50 // > 0 to the right
51 // < 0 to the left
52 // = 0 exactly on top of
53 // In 99.9999% of the cases, a trivial calculation is used. In difficult
54 // cases, a precise, compliant calculation is relied on.
55 //
56 inline
57 G4double G4PolyPhiFace::ExactZOrder( G4double z,
58  G4double qx, G4double qy, G4double qz,
59  const G4ThreeVector &v,
60  G4double normSign,
61  const G4PolyPhiFaceVertex *vert ) const
62 {
63  G4double answer = vert->z - z;
64  if (std::fabs(answer) < kCarTolerance)
65  {
66  G4ThreeVector qa( qx - vert->x + radial.x(),
67  qy - vert->y + radial.y(), qz - vert->z ),
68  qb( qx - vert->x, qy - vert->y, qz - vert->z );
69  G4ThreeVector qacb = qa.cross(qb);
70 
71  answer = normSign*qacb.dot(v)*(normal.y()*radial.x()-normal.x()*radial.y());
72  }
73 
74  return answer;
75 }