| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4PolyPhiFace.icc,v 1.6 2006/06/29 18:47:10 gunter Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $
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| 29 | //
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| 30 | //
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| 31 | // --------------------------------------------------------------------
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| 32 | // GEANT 4 inline definitions file
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| 33 | //
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| 34 | // G4PolyPhiFace.icc
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| 35 | //
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| 36 | // Implementation of inline methods of G4PolyPhiFace
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| 37 | // --------------------------------------------------------------------
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| 38 |
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| 39 | inline
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| 40 | G4VCSGface* G4PolyPhiFace::Clone()
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| 41 | {
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| 42 | return new G4PolyPhiFace(*this);
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| 43 | }
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| 44 |
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| 45 | // ExactZOrder
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| 46 | //
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| 47 | // Decide precisely whether a trajectory passes to the left, right, or exactly
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| 48 | // passes through the z position of a vertex point in our face.
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| 49 | //
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| 50 | // Result is only determined within an arbitrary (positive) factor.
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| 51 | // > 0 to the right
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| 52 | // < 0 to the left
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| 53 | // = 0 exactly on top of
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| 54 | // In 99.9999% of the cases, a trivial calculation is used. In difficult
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| 55 | // cases, a precise, compliant calculation is relied on.
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| 56 | //
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| 57 | inline
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| 58 | G4double G4PolyPhiFace::ExactZOrder( G4double z,
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| 59 | G4double qx, G4double qy, G4double qz,
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| 60 | const G4ThreeVector &v,
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| 61 | G4double normSign,
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| 62 | const G4PolyPhiFaceVertex *vert ) const
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| 63 | {
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| 64 | G4double answer = vert->z - z;
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| 65 | if (std::fabs(answer) < kCarTolerance)
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| 66 | {
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| 67 | G4ThreeVector qa( qx - vert->x + radial.x(),
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| 68 | qy - vert->y + radial.y(), qz - vert->z ),
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| 69 | qb( qx - vert->x, qy - vert->y, qz - vert->z );
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| 70 | G4ThreeVector qacb = qa.cross(qb);
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| 71 |
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| 72 | answer = normSign*qacb.dot(v)*(normal.y()*radial.x()-normal.x()*radial.y());
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| 73 | }
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| 74 |
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| 75 | return answer;
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| 76 | }
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