[1350] | 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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