| 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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