1 | The following classes (.hh. icc and .cc) are related to the tessellated solid: |
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2 | |
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3 | G4PolyhedronArbitrary |
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4 | G4QuadrangularFacet |
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5 | G4TessellatedSolid |
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6 | G4TriangularFacet |
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7 | G4VFacet |
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8 | |
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9 | |
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10 | |
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11 | How to contruct a G4TessellatedSolid |
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12 | |
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13 | G4TessellatedSolid is a special Geant4 Solid defined by a number of |
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14 | G4VFacet.It is important that the supplied facets shall form a fully |
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15 | enclose space which is the solid. |
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16 | At the moment only two types of facet can be used for the construction of |
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17 | a G4TessellatedSolid, i.e. the G4TriangularFacet and G4QuadrangularFacet. |
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18 | |
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19 | Example: |
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20 | |
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21 | ..... |
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22 | First declare a tessellated solid |
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23 | G4TessellatedSolid solidTarget = new G4TessellatedSolid("Solid_name"); |
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24 | Define the facets which form the solid |
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25 | |
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26 | G4double targetSiz = 10*cm ; |
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27 | G4TriangularFacet *facet1 = new |
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28 | G4TriangularFacet (G4ThreeVector(-targetSize,-targetSize, 0.0), |
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29 | G4ThreeVector(+targetSize,-targetSize, 0.0), |
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30 | G4ThreeVector( 0.0, 0.0,+targetSize), |
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31 | ABSOLUTE); |
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32 | G4TriangularFacet *facet2 = new |
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33 | G4TriangularFacet (G4ThreeVector(+targetSize,-targetSize, 0.0), |
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34 | G4ThreeVector(+targetSize,+targetSize, 0.0), |
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35 | G4ThreeVector( 0.0, 0.0,+targetSize), |
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36 | ABSOLUTE); |
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37 | G4TriangularFacet *facet3 = new |
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38 | G4TriangularFacet (G4ThreeVector(+targetSize,+targetSize, 0.0), |
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39 | G4ThreeVector(-targetSize,+targetSize, 0.0), |
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40 | G4ThreeVector( 0.0, 0.0,+targetSize), |
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41 | ABSOLUTE); |
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42 | G4TriangularFacet *facet4 = new |
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43 | G4TriangularFacet (G4ThreeVector(-targetSize,+targetSize, 0.0), |
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44 | G4ThreeVector(-targetSize,-targetSize, 0.0), |
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45 | G4ThreeVector( 0.0, 0.0,+targetSize), |
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46 | ABSOLUTE); |
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47 | G4QuadrangularFacet *facet5 = new |
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48 | G4QuadrangularFacet (G4ThreeVector(-targetSize,-targetSize, 0.0), |
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49 | G4ThreeVector(-targetSize,+targetSize, 0.0), |
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50 | G4ThreeVector(+targetSize,+targetSize, 0.0), |
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51 | G4ThreeVector(+targetSize,-targetSize, 0.0), |
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52 | ABSOLUTE); |
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53 | Noew add the facets to the solid |
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54 | solidTarget->AddFacet((G4VFacet*) facet1); |
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55 | solidTarget->AddFacet((G4VFacet*) facet2); |
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56 | solidTarget->AddFacet((G4VFacet*) facet3); |
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57 | solidTarget->AddFacet((G4VFacet*) facet4); |
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58 | solidTarget->AddFacet((G4VFacet*) facet5); |
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59 | Finally declare the solid is complete |
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60 | solidTarget->SetSolidClosed(true); |
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61 | |
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62 | ............... |
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63 | |
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64 | How to construct G4TriangularFacet: |
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65 | |
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66 | The G4TriangularFacet class is used for the contruction of G4TessellatedSolid. |
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67 | It is defined by three vertices, which shall be supplied |
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68 | in anti-clockwise order looking from the outsider of the solid where |
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69 | it belongs.Its constructor |
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70 | |
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71 | G4TriangularFacet (const G4ThreeVector Pt0, const G4ThreeVector vt1, |
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72 | const G4ThreeVector vt2, G4FacetVertexType); |
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73 | |
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74 | takes 4 parameters to define the three vertices: |
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75 | 1) G4FacetvertexType = "ABSOLUTE": in this case Pt0, vt1 and vt2 are |
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76 | the three vertices in anti-clockwise order looking from the outsider. |
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77 | 2) G4FacetvertexType = "RELATIVE": in this case the first vertex is Pt0, |
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78 | the second vertex is Pt0+vt1 and the third vertex is Pt0+vt2, all |
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79 | in anti-clockwise order when looking from the outsider. |
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80 | |
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81 | How to construct G4QuadrangularFacet |
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82 | |
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83 | The G4QuadrangularFacet class is used for the contruction of G4TessellatedSolid. |
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84 | It is defined by four vertices, which shall be in the same plane and be supplied |
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85 | in anti-clockwise order looking from the outsider of the solid where |
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86 | it belongs. Its constructor |
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87 | |
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88 | G4QuadrangularFacet (const G4ThreeVector Pt0, const G4ThreeVector vt1, |
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89 | const G4ThreeVector vt2, const G4ThreeVector vt3, G4FacetVertexType); |
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90 | |
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91 | takes 5 parameters to define the four vertices |
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92 | : |
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93 | 1) G4FacetvertexType = "ABSOLUTE": in this case Pt0, vt1, vt2 and vt3 are |
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94 | the four vertices required in anti-clockwise order when looking from |
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95 | the outsider. |
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96 | 2) G4FacetvertexType = "RELATIVE": in this case the first vertex is Pt0, |
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97 | the second vertex is Pt0+vt, the third vertex is Pt0+vt2 and |
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98 | the fourth vertex is Pt0+vt3, in anti-clockwise order when looking |
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99 | from the outsider. |
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