Gabriele Cosmo
45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
//
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// G4PolyPhiFace.icc
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//
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// Implementation of inline methods of G4PolyPhiFace
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//
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// ----------------------------------------------------------
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// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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//
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// ExactZOrder
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//
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// Decide precisely whether a trajectory passes to the left, right, or exactly
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// passes through the z position of a vertex point in our face.
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//
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// Result is only determined within an arbitrary (positive) factor.
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// > 0 to the right
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// < 0 to the left
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// = 0 exactly on top of
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// In 99.9999% of the cases, a trivial calculation is used. In difficult
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// cases, a precise, compliant calculation is relied on.
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//
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inline G4double G4PolyPhiFace::ExactZOrder( const G4double z,
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const G4double qx, const G4double qy, const G4double qz,
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const G4ThreeVector &v,
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const G4double normSign,
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const G4PolyPhiFaceVertex *vert ) const {
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G4double answer = vert->z - z;
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if (fabs(answer) < kCarTolerance) {
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G4ThreeVector qa( qx - vert->x + radial.x(),
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qy - vert->y + radial.y(), qz - vert->z ),
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qb( qx - vert->x, qy - vert->y, qz - vert->z );
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G4ThreeVector qacb = qa.cross(qb);
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answer = normSign*qacb.dot(v)*(normal.y()*radial.x()-normal.x()*radial.y());
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}
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return answer;
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}
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