[831] | 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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[1315] | 27 | // $Id: G4PolyconeSide.cc,v 1.24 2010/02/24 11:31:49 gcosmo Exp $ |
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[1337] | 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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[831] | 29 | // |
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| 30 | // |
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| 31 | // -------------------------------------------------------------------- |
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| 32 | // GEANT 4 class source file |
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| 33 | // |
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| 34 | // |
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| 35 | // G4PolyconeSide.cc |
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| 36 | // |
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| 37 | // Implementation of the face representing one conical side of a polycone |
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| 38 | // |
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| 39 | // -------------------------------------------------------------------- |
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| 40 | |
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| 41 | #include "G4PolyconeSide.hh" |
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| 42 | #include "G4IntersectingCone.hh" |
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| 43 | #include "G4ClippablePolygon.hh" |
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| 44 | #include "G4AffineTransform.hh" |
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| 45 | #include "meshdefs.hh" |
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| 46 | #include "G4SolidExtentList.hh" |
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| 47 | #include "G4GeometryTolerance.hh" |
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| 48 | |
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[850] | 49 | #include "Randomize.hh" |
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| 50 | |
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[831] | 51 | // |
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| 52 | // Constructor |
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| 53 | // |
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| 54 | // Values for r1,z1 and r2,z2 should be specified in clockwise |
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| 55 | // order in (r,z). |
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| 56 | // |
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| 57 | G4PolyconeSide::G4PolyconeSide( const G4PolyconeSideRZ *prevRZ, |
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| 58 | const G4PolyconeSideRZ *tail, |
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| 59 | const G4PolyconeSideRZ *head, |
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| 60 | const G4PolyconeSideRZ *nextRZ, |
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| 61 | G4double thePhiStart, |
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| 62 | G4double theDeltaPhi, |
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| 63 | G4bool thePhiIsOpen, |
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| 64 | G4bool isAllBehind ) |
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| 65 | : ncorners(0), corners(0) |
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| 66 | { |
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| 67 | kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance(); |
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[850] | 68 | fSurfaceArea = 0.0; |
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[1315] | 69 | fPhi.first = G4ThreeVector(0,0,0); |
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| 70 | fPhi.second= 0.0; |
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[831] | 71 | |
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| 72 | // |
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| 73 | // Record values |
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| 74 | // |
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| 75 | r[0] = tail->r; z[0] = tail->z; |
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| 76 | r[1] = head->r; z[1] = head->z; |
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| 77 | |
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| 78 | phiIsOpen = thePhiIsOpen; |
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| 79 | if (phiIsOpen) |
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| 80 | { |
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| 81 | deltaPhi = theDeltaPhi; |
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| 82 | startPhi = thePhiStart; |
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| 83 | |
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| 84 | // |
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| 85 | // Set phi values to our conventions |
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| 86 | // |
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| 87 | while (deltaPhi < 0.0) deltaPhi += twopi; |
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| 88 | while (startPhi < 0.0) startPhi += twopi; |
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| 89 | |
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| 90 | // |
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| 91 | // Calculate corner coordinates |
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| 92 | // |
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| 93 | ncorners = 4; |
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| 94 | corners = new G4ThreeVector[ncorners]; |
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| 95 | |
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| 96 | corners[0] = G4ThreeVector( tail->r*std::cos(startPhi), |
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| 97 | tail->r*std::sin(startPhi), tail->z ); |
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| 98 | corners[1] = G4ThreeVector( head->r*std::cos(startPhi), |
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| 99 | head->r*std::sin(startPhi), head->z ); |
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| 100 | corners[2] = G4ThreeVector( tail->r*std::cos(startPhi+deltaPhi), |
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| 101 | tail->r*std::sin(startPhi+deltaPhi), tail->z ); |
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| 102 | corners[3] = G4ThreeVector( head->r*std::cos(startPhi+deltaPhi), |
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| 103 | head->r*std::sin(startPhi+deltaPhi), head->z ); |
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| 104 | } |
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| 105 | else |
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| 106 | { |
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| 107 | deltaPhi = twopi; |
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| 108 | startPhi = 0.0; |
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| 109 | } |
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| 110 | |
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| 111 | allBehind = isAllBehind; |
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| 112 | |
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| 113 | // |
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| 114 | // Make our intersecting cone |
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| 115 | // |
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| 116 | cone = new G4IntersectingCone( r, z ); |
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| 117 | |
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| 118 | // |
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| 119 | // Calculate vectors in r,z space |
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| 120 | // |
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| 121 | rS = r[1]-r[0]; zS = z[1]-z[0]; |
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| 122 | length = std::sqrt( rS*rS + zS*zS); |
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| 123 | rS /= length; zS /= length; |
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| 124 | |
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| 125 | rNorm = +zS; |
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| 126 | zNorm = -rS; |
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| 127 | |
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| 128 | G4double lAdj; |
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| 129 | |
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| 130 | prevRS = r[0]-prevRZ->r; |
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| 131 | prevZS = z[0]-prevRZ->z; |
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| 132 | lAdj = std::sqrt( prevRS*prevRS + prevZS*prevZS ); |
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| 133 | prevRS /= lAdj; |
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| 134 | prevZS /= lAdj; |
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| 135 | |
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| 136 | rNormEdge[0] = rNorm + prevZS; |
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| 137 | zNormEdge[0] = zNorm - prevRS; |
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| 138 | lAdj = std::sqrt( rNormEdge[0]*rNormEdge[0] + zNormEdge[0]*zNormEdge[0] ); |
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| 139 | rNormEdge[0] /= lAdj; |
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| 140 | zNormEdge[0] /= lAdj; |
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| 141 | |
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| 142 | nextRS = nextRZ->r-r[1]; |
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| 143 | nextZS = nextRZ->z-z[1]; |
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| 144 | lAdj = std::sqrt( nextRS*nextRS + nextZS*nextZS ); |
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| 145 | nextRS /= lAdj; |
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| 146 | nextZS /= lAdj; |
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| 147 | |
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| 148 | rNormEdge[1] = rNorm + nextZS; |
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| 149 | zNormEdge[1] = zNorm - nextRS; |
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| 150 | lAdj = std::sqrt( rNormEdge[1]*rNormEdge[1] + zNormEdge[1]*zNormEdge[1] ); |
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| 151 | rNormEdge[1] /= lAdj; |
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| 152 | zNormEdge[1] /= lAdj; |
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| 153 | } |
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| 154 | |
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| 155 | |
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| 156 | // |
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| 157 | // Fake default constructor - sets only member data and allocates memory |
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| 158 | // for usage restricted to object persistency. |
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| 159 | // |
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| 160 | G4PolyconeSide::G4PolyconeSide( __void__& ) |
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| 161 | : phiIsOpen(false), cone(0), ncorners(0), corners(0) |
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| 162 | { |
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| 163 | } |
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| 164 | |
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| 165 | |
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| 166 | // |
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| 167 | // Destructor |
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| 168 | // |
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| 169 | G4PolyconeSide::~G4PolyconeSide() |
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| 170 | { |
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| 171 | delete cone; |
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| 172 | if (phiIsOpen) delete [] corners; |
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| 173 | } |
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| 174 | |
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| 175 | |
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| 176 | // |
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| 177 | // Copy constructor |
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| 178 | // |
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| 179 | G4PolyconeSide::G4PolyconeSide( const G4PolyconeSide &source ) |
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| 180 | : G4VCSGface() |
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| 181 | { |
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| 182 | CopyStuff( source ); |
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| 183 | } |
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| 184 | |
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| 185 | |
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| 186 | // |
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| 187 | // Assignment operator |
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| 188 | // |
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| 189 | G4PolyconeSide& G4PolyconeSide::operator=( const G4PolyconeSide &source ) |
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| 190 | { |
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| 191 | if (this == &source) return *this; |
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| 192 | |
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| 193 | delete cone; |
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| 194 | if (phiIsOpen) delete [] corners; |
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| 195 | |
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| 196 | CopyStuff( source ); |
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| 197 | |
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| 198 | return *this; |
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| 199 | } |
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| 200 | |
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| 201 | |
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| 202 | // |
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| 203 | // CopyStuff |
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| 204 | // |
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| 205 | void G4PolyconeSide::CopyStuff( const G4PolyconeSide &source ) |
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| 206 | { |
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| 207 | r[0] = source.r[0]; |
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| 208 | r[1] = source.r[1]; |
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| 209 | z[0] = source.z[0]; |
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| 210 | z[1] = source.z[1]; |
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| 211 | |
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| 212 | startPhi = source.startPhi; |
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| 213 | deltaPhi = source.deltaPhi; |
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| 214 | phiIsOpen = source.phiIsOpen; |
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| 215 | allBehind = source.allBehind; |
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| 216 | |
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| 217 | kCarTolerance = source.kCarTolerance; |
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[850] | 218 | fSurfaceArea = source.fSurfaceArea; |
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[831] | 219 | |
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| 220 | cone = new G4IntersectingCone( *source.cone ); |
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| 221 | |
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| 222 | rNorm = source.rNorm; |
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| 223 | zNorm = source.zNorm; |
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| 224 | rS = source.rS; |
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| 225 | zS = source.zS; |
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| 226 | length = source.length; |
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| 227 | prevRS = source.prevRS; |
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| 228 | prevZS = source.prevZS; |
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| 229 | nextRS = source.nextRS; |
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| 230 | nextZS = source.nextZS; |
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| 231 | |
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| 232 | rNormEdge[0] = source.rNormEdge[0]; |
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| 233 | rNormEdge[1] = source.rNormEdge[1]; |
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| 234 | zNormEdge[0] = source.zNormEdge[0]; |
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| 235 | zNormEdge[1] = source.zNormEdge[1]; |
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| 236 | |
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| 237 | if (phiIsOpen) |
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| 238 | { |
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| 239 | ncorners = 4; |
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| 240 | corners = new G4ThreeVector[ncorners]; |
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| 241 | |
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| 242 | corners[0] = source.corners[0]; |
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| 243 | corners[1] = source.corners[1]; |
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| 244 | corners[2] = source.corners[2]; |
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| 245 | corners[3] = source.corners[3]; |
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| 246 | } |
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| 247 | } |
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| 248 | |
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| 249 | |
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| 250 | // |
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| 251 | // Intersect |
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| 252 | // |
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| 253 | G4bool G4PolyconeSide::Intersect( const G4ThreeVector &p, |
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| 254 | const G4ThreeVector &v, |
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| 255 | G4bool outgoing, |
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| 256 | G4double surfTolerance, |
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| 257 | G4double &distance, |
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| 258 | G4double &distFromSurface, |
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| 259 | G4ThreeVector &normal, |
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| 260 | G4bool &isAllBehind ) |
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| 261 | { |
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| 262 | G4double s1, s2; |
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| 263 | G4double normSign = outgoing ? +1 : -1; |
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| 264 | |
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| 265 | isAllBehind = allBehind; |
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| 266 | |
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| 267 | // |
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| 268 | // Check for two possible intersections |
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| 269 | // |
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| 270 | G4int nside = cone->LineHitsCone( p, v, &s1, &s2 ); |
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| 271 | if (nside == 0) return false; |
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| 272 | |
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| 273 | // |
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| 274 | // Check the first side first, since it is (supposed to be) closest |
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| 275 | // |
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| 276 | G4ThreeVector hit = p + s1*v; |
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| 277 | |
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| 278 | if (PointOnCone( hit, normSign, p, v, normal )) |
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| 279 | { |
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| 280 | // |
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| 281 | // Good intersection! What about the normal? |
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| 282 | // |
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| 283 | if (normSign*v.dot(normal) > 0) |
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| 284 | { |
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| 285 | // |
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| 286 | // We have a valid intersection, but it could very easily |
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| 287 | // be behind the point. To decide if we tolerate this, |
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| 288 | // we have to see if the point p is on the surface near |
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| 289 | // the intersecting point. |
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| 290 | // |
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| 291 | // What does it mean exactly for the point p to be "near" |
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| 292 | // the intersection? It means that if we draw a line from |
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| 293 | // p to the hit, the line remains entirely within the |
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| 294 | // tolerance bounds of the cone. To test this, we can |
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| 295 | // ask if the normal is correct near p. |
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| 296 | // |
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| 297 | G4double pr = p.perp(); |
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| 298 | if (pr < DBL_MIN) pr = DBL_MIN; |
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| 299 | G4ThreeVector pNormal( rNorm*p.x()/pr, rNorm*p.y()/pr, zNorm ); |
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| 300 | if (normSign*v.dot(pNormal) > 0) |
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| 301 | { |
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| 302 | // |
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| 303 | // p and intersection in same hemisphere |
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| 304 | // |
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| 305 | G4double distOutside2; |
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| 306 | distFromSurface = -normSign*DistanceAway( p, false, distOutside2 ); |
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| 307 | if (distOutside2 < surfTolerance*surfTolerance) |
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| 308 | { |
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| 309 | if (distFromSurface > -surfTolerance) |
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| 310 | { |
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| 311 | // |
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| 312 | // We are just inside or away from the |
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| 313 | // surface. Accept *any* value of distance. |
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| 314 | // |
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| 315 | distance = s1; |
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| 316 | return true; |
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| 317 | } |
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| 318 | } |
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| 319 | } |
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| 320 | else |
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| 321 | distFromSurface = s1; |
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| 322 | |
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| 323 | // |
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| 324 | // Accept positive distances |
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| 325 | // |
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| 326 | if (s1 > 0) |
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| 327 | { |
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| 328 | distance = s1; |
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| 329 | return true; |
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| 330 | } |
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| 331 | } |
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| 332 | } |
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| 333 | |
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| 334 | if (nside==1) return false; |
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| 335 | |
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| 336 | // |
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| 337 | // Well, try the second hit |
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| 338 | // |
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| 339 | hit = p + s2*v; |
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| 340 | |
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| 341 | if (PointOnCone( hit, normSign, p, v, normal )) |
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| 342 | { |
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| 343 | // |
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| 344 | // Good intersection! What about the normal? |
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| 345 | // |
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| 346 | if (normSign*v.dot(normal) > 0) |
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| 347 | { |
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| 348 | G4double pr = p.perp(); |
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| 349 | if (pr < DBL_MIN) pr = DBL_MIN; |
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| 350 | G4ThreeVector pNormal( rNorm*p.x()/pr, rNorm*p.y()/pr, zNorm ); |
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| 351 | if (normSign*v.dot(pNormal) > 0) |
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| 352 | { |
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| 353 | G4double distOutside2; |
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| 354 | distFromSurface = -normSign*DistanceAway( p, false, distOutside2 ); |
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| 355 | if (distOutside2 < surfTolerance*surfTolerance) |
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| 356 | { |
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| 357 | if (distFromSurface > -surfTolerance) |
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| 358 | { |
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| 359 | distance = s2; |
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| 360 | return true; |
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| 361 | } |
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| 362 | } |
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| 363 | } |
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| 364 | else |
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| 365 | distFromSurface = s2; |
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| 366 | |
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| 367 | if (s2 > 0) |
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| 368 | { |
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| 369 | distance = s2; |
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| 370 | return true; |
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| 371 | } |
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| 372 | } |
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| 373 | } |
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| 374 | |
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| 375 | // |
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| 376 | // Better luck next time |
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| 377 | // |
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| 378 | return false; |
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| 379 | } |
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| 380 | |
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| 381 | |
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| 382 | G4double G4PolyconeSide::Distance( const G4ThreeVector &p, G4bool outgoing ) |
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| 383 | { |
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| 384 | G4double normSign = outgoing ? -1 : +1; |
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| 385 | G4double distFrom, distOut2; |
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| 386 | |
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| 387 | // |
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| 388 | // We have two tries for each hemisphere. Try the closest first. |
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| 389 | // |
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| 390 | distFrom = normSign*DistanceAway( p, false, distOut2 ); |
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| 391 | if (distFrom > -0.5*kCarTolerance ) |
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| 392 | { |
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| 393 | // |
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| 394 | // Good answer |
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| 395 | // |
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| 396 | if (distOut2 > 0) |
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| 397 | return std::sqrt( distFrom*distFrom + distOut2 ); |
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| 398 | else |
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| 399 | return std::fabs(distFrom); |
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| 400 | } |
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| 401 | |
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| 402 | // |
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| 403 | // Try second side. |
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| 404 | // |
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| 405 | distFrom = normSign*DistanceAway( p, true, distOut2 ); |
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| 406 | if (distFrom > -0.5*kCarTolerance) |
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| 407 | { |
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| 408 | |
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| 409 | if (distOut2 > 0) |
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| 410 | return std::sqrt( distFrom*distFrom + distOut2 ); |
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| 411 | else |
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| 412 | return std::fabs(distFrom); |
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| 413 | } |
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| 414 | |
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| 415 | return kInfinity; |
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| 416 | } |
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| 417 | |
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| 418 | |
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| 419 | // |
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| 420 | // Inside |
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| 421 | // |
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| 422 | EInside G4PolyconeSide::Inside( const G4ThreeVector &p, |
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| 423 | G4double tolerance, |
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| 424 | G4double *bestDistance ) |
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| 425 | { |
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| 426 | // |
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| 427 | // Check both sides |
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| 428 | // |
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| 429 | G4double distFrom[2], distOut2[2], dist2[2]; |
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| 430 | G4double edgeRZnorm[2]; |
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| 431 | |
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| 432 | distFrom[0] = DistanceAway( p, false, distOut2[0], edgeRZnorm ); |
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| 433 | distFrom[1] = DistanceAway( p, true, distOut2[1], edgeRZnorm+1 ); |
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| 434 | |
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| 435 | dist2[0] = distFrom[0]*distFrom[0] + distOut2[0]; |
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| 436 | dist2[1] = distFrom[1]*distFrom[1] + distOut2[1]; |
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| 437 | |
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| 438 | // |
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| 439 | // Who's closest? |
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| 440 | // |
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| 441 | G4int i = std::fabs(dist2[0]) < std::fabs(dist2[1]) ? 0 : 1; |
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| 442 | |
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| 443 | *bestDistance = std::sqrt( dist2[i] ); |
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| 444 | |
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| 445 | // |
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| 446 | // Okay then, inside or out? |
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| 447 | // |
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| 448 | if ( (std::fabs(edgeRZnorm[i]) < tolerance) |
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| 449 | && (distOut2[i] < tolerance*tolerance) ) |
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| 450 | return kSurface; |
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| 451 | else if (edgeRZnorm[i] < 0) |
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| 452 | return kInside; |
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| 453 | else |
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| 454 | return kOutside; |
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| 455 | } |
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| 456 | |
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| 457 | |
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| 458 | // |
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| 459 | // Normal |
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| 460 | // |
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| 461 | G4ThreeVector G4PolyconeSide::Normal( const G4ThreeVector &p, |
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| 462 | G4double *bestDistance ) |
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| 463 | { |
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| 464 | if (p == G4ThreeVector(0.,0.,0.)) { return p; } |
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| 465 | |
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[1228] | 466 | G4double dFrom, dOut2; |
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[831] | 467 | |
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| 468 | dFrom = DistanceAway( p, false, dOut2 ); |
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| 469 | |
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| 470 | *bestDistance = std::sqrt( dFrom*dFrom + dOut2 ); |
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| 471 | |
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| 472 | G4double rad = p.perp(); |
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[1228] | 473 | if (rad!=0.) { return G4ThreeVector(rNorm*p.x()/rad,rNorm*p.y()/rad,zNorm); } |
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| 474 | return G4ThreeVector( 0.,0., zNorm ).unit(); |
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[831] | 475 | } |
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| 476 | |
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| 477 | |
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| 478 | // |
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| 479 | // Extent |
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| 480 | // |
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| 481 | G4double G4PolyconeSide::Extent( const G4ThreeVector axis ) |
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| 482 | { |
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| 483 | if (axis.perp2() < DBL_MIN) |
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| 484 | { |
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| 485 | // |
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| 486 | // Special case |
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| 487 | // |
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| 488 | return axis.z() < 0 ? -cone->ZLo() : cone->ZHi(); |
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| 489 | } |
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| 490 | |
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| 491 | // |
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| 492 | // Is the axis pointing inside our phi gap? |
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| 493 | // |
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| 494 | if (phiIsOpen) |
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| 495 | { |
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[1315] | 496 | G4double phi = GetPhi(axis); |
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[831] | 497 | while( phi < startPhi ) phi += twopi; |
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| 498 | |
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| 499 | if (phi > deltaPhi+startPhi) |
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| 500 | { |
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| 501 | // |
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| 502 | // Yeah, looks so. Make four three vectors defining the phi |
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| 503 | // opening |
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| 504 | // |
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| 505 | G4double cosP = std::cos(startPhi), sinP = std::sin(startPhi); |
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| 506 | G4ThreeVector a( r[0]*cosP, r[0]*sinP, z[0] ); |
---|
| 507 | G4ThreeVector b( r[1]*cosP, r[1]*sinP, z[1] ); |
---|
| 508 | cosP = std::cos(startPhi+deltaPhi); sinP = std::sin(startPhi+deltaPhi); |
---|
| 509 | G4ThreeVector c( r[0]*cosP, r[0]*sinP, z[0] ); |
---|
| 510 | G4ThreeVector d( r[1]*cosP, r[1]*sinP, z[1] ); |
---|
| 511 | |
---|
| 512 | G4double ad = axis.dot(a), |
---|
| 513 | bd = axis.dot(b), |
---|
| 514 | cd = axis.dot(c), |
---|
| 515 | dd = axis.dot(d); |
---|
| 516 | |
---|
| 517 | if (bd > ad) ad = bd; |
---|
| 518 | if (cd > ad) ad = cd; |
---|
| 519 | if (dd > ad) ad = dd; |
---|
| 520 | |
---|
| 521 | return ad; |
---|
| 522 | } |
---|
| 523 | } |
---|
| 524 | |
---|
| 525 | // |
---|
| 526 | // Check either end |
---|
| 527 | // |
---|
| 528 | G4double aPerp = axis.perp(); |
---|
| 529 | |
---|
| 530 | G4double a = aPerp*r[0] + axis.z()*z[0]; |
---|
| 531 | G4double b = aPerp*r[1] + axis.z()*z[1]; |
---|
| 532 | |
---|
| 533 | if (b > a) a = b; |
---|
| 534 | |
---|
| 535 | return a; |
---|
| 536 | } |
---|
| 537 | |
---|
| 538 | |
---|
| 539 | |
---|
| 540 | // |
---|
| 541 | // CalculateExtent |
---|
| 542 | // |
---|
| 543 | // See notes in G4VCSGface |
---|
| 544 | // |
---|
| 545 | void G4PolyconeSide::CalculateExtent( const EAxis axis, |
---|
| 546 | const G4VoxelLimits &voxelLimit, |
---|
| 547 | const G4AffineTransform &transform, |
---|
| 548 | G4SolidExtentList &extentList ) |
---|
| 549 | { |
---|
| 550 | G4ClippablePolygon polygon; |
---|
| 551 | |
---|
| 552 | // |
---|
| 553 | // Here we will approximate (ala G4Cons) and divide our conical section |
---|
| 554 | // into segments, like G4Polyhedra. When doing so, the radius |
---|
| 555 | // is extented far enough such that the segments always lie |
---|
| 556 | // just outside the surface of the conical section we are |
---|
| 557 | // approximating. |
---|
| 558 | // |
---|
| 559 | |
---|
| 560 | // |
---|
| 561 | // Choose phi size of our segment(s) based on constants as |
---|
| 562 | // defined in meshdefs.hh |
---|
| 563 | // |
---|
| 564 | G4int numPhi = (G4int)(deltaPhi/kMeshAngleDefault) + 1; |
---|
| 565 | if (numPhi < kMinMeshSections) |
---|
| 566 | numPhi = kMinMeshSections; |
---|
| 567 | else if (numPhi > kMaxMeshSections) |
---|
| 568 | numPhi = kMaxMeshSections; |
---|
| 569 | |
---|
| 570 | G4double sigPhi = deltaPhi/numPhi; |
---|
| 571 | |
---|
| 572 | // |
---|
| 573 | // Determine radius factor to keep segments outside |
---|
| 574 | // |
---|
| 575 | G4double rFudge = 1.0/std::cos(0.5*sigPhi); |
---|
| 576 | |
---|
| 577 | // |
---|
| 578 | // Decide which radius to use on each end of the side, |
---|
| 579 | // and whether a transition mesh is required |
---|
| 580 | // |
---|
| 581 | // {r0,z0} - Beginning of this side |
---|
| 582 | // {r1,z1} - Ending of this side |
---|
| 583 | // {r2,z0} - Beginning of transition piece connecting previous |
---|
| 584 | // side (and ends at beginning of this side) |
---|
| 585 | // |
---|
| 586 | // So, order is 2 --> 0 --> 1. |
---|
| 587 | // ------- |
---|
| 588 | // |
---|
| 589 | // r2 < 0 indicates that no transition piece is required |
---|
| 590 | // |
---|
| 591 | G4double r0, r1, r2, z0, z1; |
---|
| 592 | |
---|
| 593 | r2 = -1; // By default: no transition piece |
---|
| 594 | |
---|
| 595 | if (rNorm < -DBL_MIN) |
---|
| 596 | { |
---|
| 597 | // |
---|
| 598 | // This side faces *inward*, and so our mesh has |
---|
| 599 | // the same radius |
---|
| 600 | // |
---|
| 601 | r1 = r[1]; |
---|
| 602 | z1 = z[1]; |
---|
| 603 | z0 = z[0]; |
---|
| 604 | r0 = r[0]; |
---|
| 605 | |
---|
| 606 | r2 = -1; |
---|
| 607 | |
---|
| 608 | if (prevZS > DBL_MIN) |
---|
| 609 | { |
---|
| 610 | // |
---|
| 611 | // The previous side is facing outwards |
---|
| 612 | // |
---|
| 613 | if ( prevRS*zS - prevZS*rS > 0 ) |
---|
| 614 | { |
---|
| 615 | // |
---|
| 616 | // Transition was convex: build transition piece |
---|
| 617 | // |
---|
| 618 | if (r[0] > DBL_MIN) r2 = r[0]*rFudge; |
---|
| 619 | } |
---|
| 620 | else |
---|
| 621 | { |
---|
| 622 | // |
---|
| 623 | // Transition was concave: short this side |
---|
| 624 | // |
---|
| 625 | FindLineIntersect( z0, r0, zS, rS, |
---|
| 626 | z0, r0*rFudge, prevZS, prevRS*rFudge, z0, r0 ); |
---|
| 627 | } |
---|
| 628 | } |
---|
| 629 | |
---|
| 630 | if ( nextZS > DBL_MIN && (rS*nextZS - zS*nextRS < 0) ) |
---|
| 631 | { |
---|
| 632 | // |
---|
| 633 | // The next side is facing outwards, forming a |
---|
| 634 | // concave transition: short this side |
---|
| 635 | // |
---|
| 636 | FindLineIntersect( z1, r1, zS, rS, |
---|
| 637 | z1, r1*rFudge, nextZS, nextRS*rFudge, z1, r1 ); |
---|
| 638 | } |
---|
| 639 | } |
---|
| 640 | else if (rNorm > DBL_MIN) |
---|
| 641 | { |
---|
| 642 | // |
---|
| 643 | // This side faces *outward* and is given a boost to |
---|
| 644 | // it radius |
---|
| 645 | // |
---|
| 646 | r0 = r[0]*rFudge; |
---|
| 647 | z0 = z[0]; |
---|
| 648 | r1 = r[1]*rFudge; |
---|
| 649 | z1 = z[1]; |
---|
| 650 | |
---|
| 651 | if (prevZS < -DBL_MIN) |
---|
| 652 | { |
---|
| 653 | // |
---|
| 654 | // The previous side is facing inwards |
---|
| 655 | // |
---|
| 656 | if ( prevRS*zS - prevZS*rS > 0 ) |
---|
| 657 | { |
---|
| 658 | // |
---|
| 659 | // Transition was convex: build transition piece |
---|
| 660 | // |
---|
| 661 | if (r[0] > DBL_MIN) r2 = r[0]; |
---|
| 662 | } |
---|
| 663 | else |
---|
| 664 | { |
---|
| 665 | // |
---|
| 666 | // Transition was concave: short this side |
---|
| 667 | // |
---|
| 668 | FindLineIntersect( z0, r0, zS, rS*rFudge, |
---|
| 669 | z0, r[0], prevZS, prevRS, z0, r0 ); |
---|
| 670 | } |
---|
| 671 | } |
---|
| 672 | |
---|
| 673 | if ( nextZS < -DBL_MIN && (rS*nextZS - zS*nextRS < 0) ) |
---|
| 674 | { |
---|
| 675 | // |
---|
| 676 | // The next side is facing inwards, forming a |
---|
| 677 | // concave transition: short this side |
---|
| 678 | // |
---|
| 679 | FindLineIntersect( z1, r1, zS, rS*rFudge, |
---|
| 680 | z1, r[1], nextZS, nextRS, z1, r1 ); |
---|
| 681 | } |
---|
| 682 | } |
---|
| 683 | else |
---|
| 684 | { |
---|
| 685 | // |
---|
| 686 | // This side is perpendicular to the z axis (is a disk) |
---|
| 687 | // |
---|
| 688 | // Whether or not r0 needs a rFudge factor depends |
---|
| 689 | // on the normal of the previous edge. Similar with r1 |
---|
| 690 | // and the next edge. No transition piece is required. |
---|
| 691 | // |
---|
| 692 | r0 = r[0]; |
---|
| 693 | r1 = r[1]; |
---|
| 694 | z0 = z[0]; |
---|
| 695 | z1 = z[1]; |
---|
| 696 | |
---|
| 697 | if (prevZS > DBL_MIN) r0 *= rFudge; |
---|
| 698 | if (nextZS > DBL_MIN) r1 *= rFudge; |
---|
| 699 | } |
---|
| 700 | |
---|
| 701 | // |
---|
| 702 | // Loop |
---|
| 703 | // |
---|
| 704 | G4double phi = startPhi, |
---|
| 705 | cosPhi = std::cos(phi), |
---|
| 706 | sinPhi = std::sin(phi); |
---|
| 707 | |
---|
| 708 | G4ThreeVector v0( r0*cosPhi, r0*sinPhi, z0 ), |
---|
| 709 | v1( r1*cosPhi, r1*sinPhi, z1 ), |
---|
| 710 | v2, w0, w1, w2; |
---|
| 711 | transform.ApplyPointTransform( v0 ); |
---|
| 712 | transform.ApplyPointTransform( v1 ); |
---|
| 713 | |
---|
| 714 | if (r2 >= 0) |
---|
| 715 | { |
---|
| 716 | v2 = G4ThreeVector( r2*cosPhi, r2*sinPhi, z0 ); |
---|
| 717 | transform.ApplyPointTransform( v2 ); |
---|
| 718 | } |
---|
| 719 | |
---|
| 720 | do |
---|
| 721 | { |
---|
| 722 | phi += sigPhi; |
---|
| 723 | if (numPhi == 1) phi = startPhi+deltaPhi; // Try to avoid roundoff |
---|
| 724 | cosPhi = std::cos(phi), |
---|
| 725 | sinPhi = std::sin(phi); |
---|
| 726 | |
---|
| 727 | w0 = G4ThreeVector( r0*cosPhi, r0*sinPhi, z0 ); |
---|
| 728 | w1 = G4ThreeVector( r1*cosPhi, r1*sinPhi, z1 ); |
---|
| 729 | transform.ApplyPointTransform( w0 ); |
---|
| 730 | transform.ApplyPointTransform( w1 ); |
---|
| 731 | |
---|
| 732 | G4ThreeVector deltaV = r0 > r1 ? w0-v0 : w1-v1; |
---|
| 733 | |
---|
| 734 | // |
---|
| 735 | // Build polygon, taking special care to keep the vertices |
---|
| 736 | // in order |
---|
| 737 | // |
---|
| 738 | polygon.ClearAllVertices(); |
---|
| 739 | |
---|
| 740 | polygon.AddVertexInOrder( v0 ); |
---|
| 741 | polygon.AddVertexInOrder( v1 ); |
---|
| 742 | polygon.AddVertexInOrder( w1 ); |
---|
| 743 | polygon.AddVertexInOrder( w0 ); |
---|
| 744 | |
---|
| 745 | // |
---|
| 746 | // Get extent |
---|
| 747 | // |
---|
| 748 | if (polygon.PartialClip( voxelLimit, axis )) |
---|
| 749 | { |
---|
| 750 | // |
---|
| 751 | // Get dot product of normal with target axis |
---|
| 752 | // |
---|
| 753 | polygon.SetNormal( deltaV.cross(v1-v0).unit() ); |
---|
| 754 | |
---|
| 755 | extentList.AddSurface( polygon ); |
---|
| 756 | } |
---|
| 757 | |
---|
| 758 | if (r2 >= 0) |
---|
| 759 | { |
---|
| 760 | // |
---|
| 761 | // Repeat, for transition piece |
---|
| 762 | // |
---|
| 763 | w2 = G4ThreeVector( r2*cosPhi, r2*sinPhi, z0 ); |
---|
| 764 | transform.ApplyPointTransform( w2 ); |
---|
| 765 | |
---|
| 766 | polygon.ClearAllVertices(); |
---|
| 767 | |
---|
| 768 | polygon.AddVertexInOrder( v2 ); |
---|
| 769 | polygon.AddVertexInOrder( v0 ); |
---|
| 770 | polygon.AddVertexInOrder( w0 ); |
---|
| 771 | polygon.AddVertexInOrder( w2 ); |
---|
| 772 | |
---|
| 773 | if (polygon.PartialClip( voxelLimit, axis )) |
---|
| 774 | { |
---|
| 775 | polygon.SetNormal( deltaV.cross(v0-v2).unit() ); |
---|
| 776 | |
---|
| 777 | extentList.AddSurface( polygon ); |
---|
| 778 | } |
---|
| 779 | |
---|
| 780 | v2 = w2; |
---|
| 781 | } |
---|
| 782 | |
---|
| 783 | // |
---|
| 784 | // Next vertex |
---|
| 785 | // |
---|
| 786 | v0 = w0; |
---|
| 787 | v1 = w1; |
---|
| 788 | } while( --numPhi > 0 ); |
---|
| 789 | |
---|
| 790 | // |
---|
| 791 | // We are almost done. But, it is important that we leave no |
---|
| 792 | // gaps in the surface of our solid. By using rFudge, however, |
---|
| 793 | // we've done exactly that, if we have a phi segment. |
---|
| 794 | // Add two additional faces if necessary |
---|
| 795 | // |
---|
| 796 | if (phiIsOpen && rNorm > DBL_MIN) |
---|
| 797 | { |
---|
| 798 | G4double cosPhi = std::cos(startPhi), |
---|
| 799 | sinPhi = std::sin(startPhi); |
---|
| 800 | |
---|
| 801 | G4ThreeVector a0( r[0]*cosPhi, r[0]*sinPhi, z[0] ), |
---|
| 802 | a1( r[1]*cosPhi, r[1]*sinPhi, z[1] ), |
---|
| 803 | b0( r0*cosPhi, r0*sinPhi, z[0] ), |
---|
| 804 | b1( r1*cosPhi, r1*sinPhi, z[1] ); |
---|
| 805 | |
---|
| 806 | transform.ApplyPointTransform( a0 ); |
---|
| 807 | transform.ApplyPointTransform( a1 ); |
---|
| 808 | transform.ApplyPointTransform( b0 ); |
---|
| 809 | transform.ApplyPointTransform( b1 ); |
---|
| 810 | |
---|
| 811 | polygon.ClearAllVertices(); |
---|
| 812 | |
---|
| 813 | polygon.AddVertexInOrder( a0 ); |
---|
| 814 | polygon.AddVertexInOrder( a1 ); |
---|
| 815 | polygon.AddVertexInOrder( b0 ); |
---|
| 816 | polygon.AddVertexInOrder( b1 ); |
---|
| 817 | |
---|
| 818 | if (polygon.PartialClip( voxelLimit , axis)) |
---|
| 819 | { |
---|
| 820 | G4ThreeVector normal( sinPhi, -cosPhi, 0 ); |
---|
| 821 | polygon.SetNormal( transform.TransformAxis( normal ) ); |
---|
| 822 | |
---|
| 823 | extentList.AddSurface( polygon ); |
---|
| 824 | } |
---|
| 825 | |
---|
| 826 | cosPhi = std::cos(startPhi+deltaPhi); |
---|
| 827 | sinPhi = std::sin(startPhi+deltaPhi); |
---|
| 828 | |
---|
| 829 | a0 = G4ThreeVector( r[0]*cosPhi, r[0]*sinPhi, z[0] ), |
---|
| 830 | a1 = G4ThreeVector( r[1]*cosPhi, r[1]*sinPhi, z[1] ), |
---|
| 831 | b0 = G4ThreeVector( r0*cosPhi, r0*sinPhi, z[0] ), |
---|
| 832 | b1 = G4ThreeVector( r1*cosPhi, r1*sinPhi, z[1] ); |
---|
| 833 | transform.ApplyPointTransform( a0 ); |
---|
| 834 | transform.ApplyPointTransform( a1 ); |
---|
| 835 | transform.ApplyPointTransform( b0 ); |
---|
| 836 | transform.ApplyPointTransform( b1 ); |
---|
| 837 | |
---|
| 838 | polygon.ClearAllVertices(); |
---|
| 839 | |
---|
| 840 | polygon.AddVertexInOrder( a0 ); |
---|
| 841 | polygon.AddVertexInOrder( a1 ); |
---|
| 842 | polygon.AddVertexInOrder( b0 ); |
---|
| 843 | polygon.AddVertexInOrder( b1 ); |
---|
| 844 | |
---|
| 845 | if (polygon.PartialClip( voxelLimit, axis )) |
---|
| 846 | { |
---|
| 847 | G4ThreeVector normal( -sinPhi, cosPhi, 0 ); |
---|
| 848 | polygon.SetNormal( transform.TransformAxis( normal ) ); |
---|
| 849 | |
---|
| 850 | extentList.AddSurface( polygon ); |
---|
| 851 | } |
---|
| 852 | } |
---|
| 853 | |
---|
| 854 | return; |
---|
| 855 | } |
---|
| 856 | |
---|
[1315] | 857 | // |
---|
| 858 | // GetPhi |
---|
| 859 | // |
---|
| 860 | // Calculate Phi for a given 3-vector (point), if not already cached for the |
---|
| 861 | // same point, in the attempt to avoid consecutive computation of the same |
---|
| 862 | // quantity |
---|
| 863 | // |
---|
| 864 | G4double G4PolyconeSide::GetPhi( const G4ThreeVector& p ) |
---|
| 865 | { |
---|
| 866 | G4double val=0.; |
---|
[831] | 867 | |
---|
[1315] | 868 | if (fPhi.first != p) |
---|
| 869 | { |
---|
| 870 | val = p.phi(); |
---|
| 871 | fPhi.first = p; |
---|
| 872 | fPhi.second = val; |
---|
| 873 | } |
---|
| 874 | else |
---|
| 875 | { |
---|
| 876 | val = fPhi.second; |
---|
| 877 | } |
---|
| 878 | return val; |
---|
| 879 | } |
---|
| 880 | |
---|
[831] | 881 | // |
---|
| 882 | // DistanceAway |
---|
| 883 | // |
---|
| 884 | // Calculate distance of a point from our conical surface, including the effect |
---|
| 885 | // of any phi segmentation |
---|
| 886 | // |
---|
| 887 | // Arguments: |
---|
| 888 | // p - (in) Point to check |
---|
| 889 | // opposite - (in) If true, check opposite hemisphere (see below) |
---|
| 890 | // distOutside - (out) Additional distance outside the edges of the surface |
---|
| 891 | // edgeRZnorm - (out) if negative, point is inside |
---|
| 892 | // |
---|
| 893 | // return value = distance from the conical plane, if extrapolated beyond edges, |
---|
| 894 | // signed by whether the point is in inside or outside the shape |
---|
| 895 | // |
---|
| 896 | // Notes: |
---|
| 897 | // * There are two answers, depending on which hemisphere is considered. |
---|
| 898 | // |
---|
| 899 | G4double G4PolyconeSide::DistanceAway( const G4ThreeVector &p, |
---|
| 900 | G4bool opposite, |
---|
| 901 | G4double &distOutside2, |
---|
| 902 | G4double *edgeRZnorm ) |
---|
| 903 | { |
---|
| 904 | // |
---|
| 905 | // Convert our point to r and z |
---|
| 906 | // |
---|
| 907 | G4double rx = p.perp(), zx = p.z(); |
---|
| 908 | |
---|
| 909 | // |
---|
| 910 | // Change sign of r if opposite says we should |
---|
| 911 | // |
---|
| 912 | if (opposite) rx = -rx; |
---|
| 913 | |
---|
| 914 | // |
---|
| 915 | // Calculate return value |
---|
| 916 | // |
---|
| 917 | G4double deltaR = rx - r[0], deltaZ = zx - z[0]; |
---|
| 918 | G4double answer = deltaR*rNorm + deltaZ*zNorm; |
---|
| 919 | |
---|
| 920 | // |
---|
| 921 | // Are we off the surface in r,z space? |
---|
| 922 | // |
---|
| 923 | G4double s = deltaR*rS + deltaZ*zS; |
---|
| 924 | if (s < 0) |
---|
| 925 | { |
---|
| 926 | distOutside2 = s*s; |
---|
| 927 | if (edgeRZnorm) *edgeRZnorm = deltaR*rNormEdge[0] + deltaZ*zNormEdge[0]; |
---|
| 928 | } |
---|
| 929 | else if (s > length) |
---|
| 930 | { |
---|
| 931 | distOutside2 = sqr( s-length ); |
---|
| 932 | if (edgeRZnorm) |
---|
| 933 | { |
---|
| 934 | G4double deltaR = rx - r[1], deltaZ = zx - z[1]; |
---|
| 935 | *edgeRZnorm = deltaR*rNormEdge[1] + deltaZ*zNormEdge[1]; |
---|
| 936 | } |
---|
| 937 | } |
---|
| 938 | else |
---|
| 939 | { |
---|
| 940 | distOutside2 = 0; |
---|
| 941 | if (edgeRZnorm) *edgeRZnorm = answer; |
---|
| 942 | } |
---|
| 943 | |
---|
| 944 | if (phiIsOpen) |
---|
| 945 | { |
---|
| 946 | // |
---|
| 947 | // Finally, check phi |
---|
| 948 | // |
---|
[1315] | 949 | G4double phi = GetPhi(p); |
---|
[831] | 950 | while( phi < startPhi ) phi += twopi; |
---|
| 951 | |
---|
| 952 | if (phi > startPhi+deltaPhi) |
---|
| 953 | { |
---|
| 954 | // |
---|
| 955 | // Oops. Are we closer to the start phi or end phi? |
---|
| 956 | // |
---|
| 957 | G4double d1 = phi-startPhi-deltaPhi; |
---|
| 958 | while( phi > startPhi ) phi -= twopi; |
---|
| 959 | G4double d2 = startPhi-phi; |
---|
| 960 | |
---|
| 961 | if (d2 < d1) d1 = d2; |
---|
| 962 | |
---|
| 963 | // |
---|
| 964 | // Add result to our distance |
---|
| 965 | // |
---|
| 966 | G4double dist = d1*rx; |
---|
| 967 | |
---|
| 968 | distOutside2 += dist*dist; |
---|
| 969 | if (edgeRZnorm) |
---|
| 970 | { |
---|
| 971 | *edgeRZnorm = std::max(std::fabs(*edgeRZnorm),std::fabs(dist)); |
---|
| 972 | } |
---|
| 973 | } |
---|
| 974 | } |
---|
| 975 | |
---|
| 976 | return answer; |
---|
| 977 | } |
---|
| 978 | |
---|
| 979 | |
---|
| 980 | // |
---|
| 981 | // PointOnCone |
---|
| 982 | // |
---|
| 983 | // Decide if a point is on a cone and return normal if it is |
---|
| 984 | // |
---|
| 985 | G4bool G4PolyconeSide::PointOnCone( const G4ThreeVector &hit, |
---|
| 986 | G4double normSign, |
---|
| 987 | const G4ThreeVector &p, |
---|
| 988 | const G4ThreeVector &v, |
---|
| 989 | G4ThreeVector &normal ) |
---|
| 990 | { |
---|
| 991 | G4double rx = hit.perp(); |
---|
| 992 | // |
---|
| 993 | // Check radial/z extent, as appropriate |
---|
| 994 | // |
---|
| 995 | if (!cone->HitOn( rx, hit.z() )) return false; |
---|
| 996 | |
---|
| 997 | if (phiIsOpen) |
---|
| 998 | { |
---|
| 999 | G4double phiTolerant = 2.0*kCarTolerance/(rx+kCarTolerance); |
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| 1000 | // |
---|
| 1001 | // Check phi segment. Here we have to be careful |
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| 1002 | // to use the standard method consistent with |
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| 1003 | // PolyPhiFace. See PolyPhiFace::InsideEdgesExact |
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| 1004 | // |
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[1315] | 1005 | G4double phi = GetPhi(hit); |
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[831] | 1006 | while( phi < startPhi-phiTolerant ) phi += twopi; |
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| 1007 | |
---|
| 1008 | if (phi > startPhi+deltaPhi+phiTolerant) return false; |
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| 1009 | |
---|
| 1010 | if (phi > startPhi+deltaPhi-phiTolerant) |
---|
| 1011 | { |
---|
| 1012 | // |
---|
| 1013 | // Exact treatment |
---|
| 1014 | // |
---|
| 1015 | G4ThreeVector qx = p + v; |
---|
| 1016 | G4ThreeVector qa = qx - corners[2], |
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| 1017 | qb = qx - corners[3]; |
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| 1018 | G4ThreeVector qacb = qa.cross(qb); |
---|
| 1019 | |
---|
| 1020 | if (normSign*qacb.dot(v) < 0) return false; |
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| 1021 | } |
---|
| 1022 | else if (phi < phiTolerant) |
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| 1023 | { |
---|
| 1024 | G4ThreeVector qx = p + v; |
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| 1025 | G4ThreeVector qa = qx - corners[1], |
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| 1026 | qb = qx - corners[0]; |
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| 1027 | G4ThreeVector qacb = qa.cross(qb); |
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| 1028 | |
---|
| 1029 | if (normSign*qacb.dot(v) < 0) return false; |
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| 1030 | } |
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| 1031 | } |
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| 1032 | |
---|
| 1033 | // |
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| 1034 | // We have a good hit! Calculate normal |
---|
| 1035 | // |
---|
| 1036 | if (rx < DBL_MIN) |
---|
| 1037 | normal = G4ThreeVector( 0, 0, zNorm < 0 ? -1 : 1 ); |
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| 1038 | else |
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| 1039 | normal = G4ThreeVector( rNorm*hit.x()/rx, rNorm*hit.y()/rx, zNorm ); |
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| 1040 | return true; |
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| 1041 | } |
---|
| 1042 | |
---|
| 1043 | |
---|
| 1044 | // |
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| 1045 | // FindLineIntersect |
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| 1046 | // |
---|
| 1047 | // Decide the point at which two 2-dimensional lines intersect |
---|
| 1048 | // |
---|
| 1049 | // Equation of line: x = x1 + s*tx1 |
---|
| 1050 | // y = y1 + s*ty1 |
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| 1051 | // |
---|
| 1052 | // It is assumed that the lines are *not* parallel |
---|
| 1053 | // |
---|
| 1054 | void G4PolyconeSide::FindLineIntersect( G4double x1, G4double y1, |
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| 1055 | G4double tx1, G4double ty1, |
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| 1056 | G4double x2, G4double y2, |
---|
| 1057 | G4double tx2, G4double ty2, |
---|
| 1058 | G4double &x, G4double &y ) |
---|
| 1059 | { |
---|
| 1060 | // |
---|
| 1061 | // The solution is a simple linear equation |
---|
| 1062 | // |
---|
| 1063 | G4double deter = tx1*ty2 - tx2*ty1; |
---|
| 1064 | |
---|
| 1065 | G4double s1 = ((x2-x1)*ty2 - tx2*(y2-y1))/deter; |
---|
| 1066 | G4double s2 = ((x2-x1)*ty1 - tx1*(y2-y1))/deter; |
---|
| 1067 | |
---|
| 1068 | // |
---|
| 1069 | // We want the answer to not depend on which order the |
---|
| 1070 | // lines were specified. Take average. |
---|
| 1071 | // |
---|
| 1072 | x = 0.5*( x1+s1*tx1 + x2+s2*tx2 ); |
---|
| 1073 | y = 0.5*( y1+s1*ty1 + y2+s2*ty2 ); |
---|
| 1074 | } |
---|
[850] | 1075 | |
---|
| 1076 | // |
---|
| 1077 | // Calculate surface area for GetPointOnSurface() |
---|
| 1078 | // |
---|
| 1079 | G4double G4PolyconeSide::SurfaceArea() |
---|
| 1080 | { |
---|
| 1081 | if(fSurfaceArea==0) |
---|
| 1082 | { |
---|
| 1083 | fSurfaceArea = (r[0]+r[1])* std::sqrt(sqr(r[0]-r[1])+sqr(z[0]-z[1])); |
---|
| 1084 | fSurfaceArea *= 0.5*(deltaPhi); |
---|
| 1085 | } |
---|
| 1086 | return fSurfaceArea; |
---|
| 1087 | } |
---|
| 1088 | |
---|
| 1089 | // |
---|
| 1090 | // GetPointOnFace |
---|
| 1091 | // |
---|
| 1092 | G4ThreeVector G4PolyconeSide::GetPointOnFace() |
---|
| 1093 | { |
---|
| 1094 | G4double x,y,zz; |
---|
| 1095 | G4double rr,phi,dz,dr; |
---|
| 1096 | dr=r[1]-r[0];dz=z[1]-z[0]; |
---|
| 1097 | phi=startPhi+deltaPhi*G4UniformRand(); |
---|
| 1098 | rr=r[0]+dr*G4UniformRand(); |
---|
| 1099 | |
---|
| 1100 | x=rr*std::cos(phi); |
---|
| 1101 | y=rr*std::sin(phi); |
---|
| 1102 | |
---|
| 1103 | // PolyconeSide has a Ring Form |
---|
| 1104 | // |
---|
| 1105 | if (dz==0.) |
---|
| 1106 | { |
---|
| 1107 | zz=z[0]; |
---|
| 1108 | } |
---|
| 1109 | else |
---|
| 1110 | { |
---|
| 1111 | if(dr==0.) // PolyconeSide has a Tube Form |
---|
| 1112 | { |
---|
| 1113 | zz = z[0]+dz*G4UniformRand(); |
---|
| 1114 | } |
---|
| 1115 | else |
---|
| 1116 | { |
---|
| 1117 | zz = z[0]+(rr-r[0])*dz/dr; |
---|
| 1118 | } |
---|
| 1119 | } |
---|
| 1120 | |
---|
| 1121 | return G4ThreeVector(x,y,zz); |
---|
| 1122 | } |
---|