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1
2 =========================================================
3 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
4 =========================================================
5
6 Example TextGeom
7 ----------------
8
9 This example illustrates the use of the text geometry.
10
11 1.- GEOMETRY EXAMPLES
12
13 Several examples of text geometries are provided:
14
15 g4geom_simple.txt :
16 - Simple construction of materials and single placements
17
18 g4geom_matemixt.txt :
19 - Isotopes, elements and materials
20
21 g4geom_boolean.txt :
22 - Boolean solids
23
24 g4geom_reflections.txt :
25 - Reflections
26
27 g4geom_replicas.txt :
28 - Replicas
29
30 g4geom_divisions.txt :
31 - Divisions
32
33 g4geom_paramLinear.txt :
34 - Linear parameterisations
35
36 g4geom_paramSquare.txt :
37 - Square parameterisations
38
39 g4geom_assembly.txt :
40 - Assembly placements
41
42
43 2.- HOW TO START ?
44
45 - execute textGeom in 'batch' mode from macro file
46 % textGeom run.mac
47
48 It will read the geometry from a file named 'g4geom.txt', and it will create a
49 VRML2 file to visualise the geometry.
50 Therefore if you want to try any of the above-mentioned files, copy it to a
51 file with this name,
52
53
54 3.- DEFINING A SENSITIVE DETECTOR
55
56 The detector construction class ExTGDetectorConstructionWithSD shows how to
57 access a volume of the text geometry and assign to it a sensitive detector.
58 To use it, replace at exampleTextGeom.cc the line
59
60 runManager->SetUserInitialization(new ExTGDetectorConstruction);
61
62 by
63
64 runManager->SetUserInitialization(new ExTGDetectorConstructionWithSD);
65
66 and recompile.
67
68 It will use the geometry from the file 'g4geom_SD.txt'
69
70
71 4.- MIXING TEXT AND C++ GEOMETRIES
72
73 The detector construction class ExTGDetectorConstructionWithCpp shows how to
74 create a volume with C++ and place it in the world or inside a volume defined
75 in the text geometry.
76 To use it, replace at exampleTextGeom.cc the line
77
78 runManager->SetUserInitialization(new ExTGDetectorConstruction);
79
80 by
81
82 runManager->SetUserInitialization(new ExTGDetectorConstructionWithCpp);
83
84 and recompile.
85
86 It will use the geometry from the file 'g4geom_simple.txt'
87
88
89 5.- CREATING NEW TAGS IN THE TEXT GEOMETRY: DEFINING CUTS PER REGION
90
91 The detector construction class ExTGDetectorConstructionWithCuts, together with
92 ExTGRCLineProcessor, ExTGRCDetectorBuilder, ExTGRCRegionCutsMgr and
93 ExTGRCRegionData show how to add a couple of tags, ':REGION' and ':CUT', that
94 allow to define cuts per region in your input geometry text file.
95 To use it, replace at exampleTextGeom.cc the line
96
97 runManager->SetUserInitialization(new ExTGDetectorConstruction);
98
99 by
100
101 runManager->SetUserInitialization(new ExTGDetectorConstructionWithCuts);
102
103 and recompile.
104
105 It will use the geometry from the file 'g4geom_cutsPerRegion.txt'
106
107
108 6.- DUMP THE IN-MEMORY GEOMETRY TO TEXT FILE
109
110 The run action 'ExTGRunAction' triggers the writing of the in-memory Geant4
111 geometry to a text file.
112 To use it you just have to uncomment in exampleTextGeom.cc the line
113
114 runManager->SetUserAction(new ExTGRunAction);
115
116 and it will read the geometry from the file 'g4geom.txt' and will write the
117 geometry in a file named 'geom.txt'
