| 1 | <html> |
|---|
| 2 | <head> |
|---|
| 3 | <title>ADG: Geometry</title> |
|---|
| 4 | </head> |
|---|
| 5 | |
|---|
| 6 | <!-- Changed by: Gabriele Cosmo, 18-Apr-2005 --> |
|---|
| 7 | <!-- $Id: geomEditor.html,v 1.2 2006/06/09 14:00:04 gcosmo Exp $ --> |
|---|
| 8 | <!-- $Name: $ --> |
|---|
| 9 | <body> |
|---|
| 10 | <table WIDTH="100%"><tr> |
|---|
| 11 | <td> |
|---|
| 12 | <a href="../../../../Overview/html/index.html"> |
|---|
| 13 | <IMG SRC="../../../../resources/html/IconsGIF/Overview.gif" ALT="Overview"></a> |
|---|
| 14 | <a href="geometry.html"> |
|---|
| 15 | <IMG SRC="../../../../resources/html/IconsGIF/Contents.gif" ALT="Contents"></a> |
|---|
| 16 | <a href="geomNav.html"> |
|---|
| 17 | <IMG SRC="../../../../resources/html/IconsGIF/Previous.gif" ALT="Previous"></a> |
|---|
| 18 | <a href="geomG3toG4.html"> |
|---|
| 19 | <IMG SRC="../../../../resources/html/IconsGIF/Next.gif" ALT="Next"></a> |
|---|
| 20 | </td> |
|---|
| 21 | <td ALIGN="Right"> |
|---|
| 22 | <font SIZE="-1" COLOR="#238E23"> |
|---|
| 23 | <b>Geant4 User's Guide</b> |
|---|
| 24 | <br> |
|---|
| 25 | <b>For Application Developers</b> |
|---|
| 26 | <br> |
|---|
| 27 | <b>Geometry</b> |
|---|
| 28 | </font> |
|---|
| 29 | </td> |
|---|
| 30 | </tr></table> |
|---|
| 31 | <br><br> |
|---|
| 32 | |
|---|
| 33 | <a name="4.1.9"> |
|---|
| 34 | <h2>4.1.9 A Simple Geometry Editor</h2></a> |
|---|
| 35 | |
|---|
| 36 | <p> |
|---|
| 37 | GGE is the Geant4 Graphical Geometry Editor. It is implemented in JAVA and |
|---|
| 38 | is part of the Momo environment. GGE aims to serve physicists who have a |
|---|
| 39 | little knowledge of C++ and the Geant4 toolkit to construct his or her own |
|---|
| 40 | detector geometry in a graphical manner. |
|---|
| 41 | </p> |
|---|
| 42 | <p> |
|---|
| 43 | GGE provides methods to: |
|---|
| 44 | <OL> |
|---|
| 45 | <li>construct a detector geometry including |
|---|
| 46 | <tt>G4Element</tt>, <tt>G4Material</tt>, <tt>G4Solids</tt>, |
|---|
| 47 | <tt>G4LogicalVolume</tt>, <tt>G4PVPlacement</tt>, etc. |
|---|
| 48 | <li>view the detector geometry using existing visualization system like DAWN |
|---|
| 49 | <li>keep the detector object in a persistent way |
|---|
| 50 | <li>produce corresponding C++ codes after the norm of Geant4 toolkit |
|---|
| 51 | <li>make a Geant4 executable under adequate environment |
|---|
| 52 | </OL> |
|---|
| 53 | |
|---|
| 54 | GGE is implemented with Java, using Java Foundation Class, Swing-1.0.2. |
|---|
| 55 | In essence, GGE is made a set of tables which contain all relevant |
|---|
| 56 | parameters to construct a simple detector geometry.<BR> |
|---|
| 57 | The software, installation instructions and notes for GGE and other JAVA-based |
|---|
| 58 | UI tools can be freely downloaded from the |
|---|
| 59 | <a href="http://erpc1.naruto-u.ac.jp/~geant4/">Geant4 GUI and Environments |
|---|
| 60 | web site</a> of Naruto University of Education in Japan. |
|---|
| 61 | </p> |
|---|
| 62 | <p> |
|---|
| 63 | <b>Materials: elements and mixtures</b> |
|---|
| 64 | <p> |
|---|
| 65 | GGE provides the database of elements in a form of the periodic |
|---|
| 66 | table, which users can use to construct new materials. |
|---|
| 67 | GGE provides a pre-constructed database of materials taken from the PDG book. |
|---|
| 68 | They can be loaded, used, edited and saved as persistent objects. |
|---|
| 69 | <p> |
|---|
| 70 | Users can also create new materials either from scratch or by combining other |
|---|
| 71 | materials. |
|---|
| 72 | |
|---|
| 73 | <ul> |
|---|
| 74 | <li>creating a material from scratch: |
|---|
| 75 | <p> |
|---|
| 76 | <table border=2 cellpadding=8> |
|---|
| 77 | <tr><td>Use</td> <td>Name</td><td> A</td> <td>Z</td> <td>Density</td> |
|---|
| 78 | <td>Unit</td> <td>State</td> <td>Temperature</td><td>Unit </td> |
|---|
| 79 | <td>Pressure</td> <td>Unit</td> |
|---|
| 80 | </tr> |
|---|
| 81 | </table> |
|---|
| 82 | <p> |
|---|
| 83 | Only the elements and materials used in the logical volumes are |
|---|
| 84 | kept in the detector object and are used to generate C++ constructors. |
|---|
| 85 | <b>Use</b> marks the used materials. |
|---|
| 86 | <p> |
|---|
| 87 | <li>Constructor to create a material from a combination of elements, |
|---|
| 88 | subsequently added via <tt>AddElement</tt> |
|---|
| 89 | <p> |
|---|
| 90 | <table border=2 cellpadding=8> |
|---|
| 91 | <tr><td>Use</td> <td>Name</td><td> Elements</td><td> Density</td> |
|---|
| 92 | <td> Unit</td><td> State</td> <td>Temperature</td> <td>Unit</td> |
|---|
| 93 | <td>Pressure</td> <td>Unit</td> |
|---|
| 94 | </tr> |
|---|
| 95 | </table> |
|---|
| 96 | <p> |
|---|
| 97 | By clicking the column <b>Elements</b>, |
|---|
| 98 | a new window is open to select one of two methods: |
|---|
| 99 | <p> |
|---|
| 100 | <ul> |
|---|
| 101 | <li>Add an element, giving fraction by weight |
|---|
| 102 | <li>Add an element, giving number of atoms. |
|---|
| 103 | </ul> |
|---|
| 104 | </ul> |
|---|
| 105 | <p> |
|---|
| 106 | |
|---|
| 107 | <b>Solids</b> |
|---|
| 108 | <p> |
|---|
| 109 | The most popular CSG solids (<tt>G4Box</tt>, <tt>G4Tubs</tt>, <tt>G4Cons</tt>, |
|---|
| 110 | <tt>G4Trd</tt>) and specific BREPs solids (Pcons, Pgons) are supported at |
|---|
| 111 | present. All related parameters of such a solid can be specified in a |
|---|
| 112 | parameter widget. |
|---|
| 113 | <p> |
|---|
| 114 | Users will be able to view each solid using DAWN. |
|---|
| 115 | <p> |
|---|
| 116 | |
|---|
| 117 | <b>Logical Volume</b> |
|---|
| 118 | <p> |
|---|
| 119 | GGE can specify the following items: |
|---|
| 120 | <p> |
|---|
| 121 | <table border=2 cellpadding=8> |
|---|
| 122 | <tr><td>Name</td><td>Solid</td><td> Material</td><td> VisAttribute</td> |
|---|
| 123 | </tr> |
|---|
| 124 | </table> |
|---|
| 125 | <p> |
|---|
| 126 | The construction and assignment of appropriate entities for |
|---|
| 127 | <tt>G4FieldManager</tt> and <tt>G4VSensitiveDetector</tt> are left to the user. |
|---|
| 128 | <p> |
|---|
| 129 | |
|---|
| 130 | <b>Physical Volume</b> |
|---|
| 131 | <p> |
|---|
| 132 | A single copy of a physical volume can be created. Also repeated copies can |
|---|
| 133 | be created in several manners. First, a user can translate the logical volume |
|---|
| 134 | linearly. |
|---|
| 135 | <p> |
|---|
| 136 | <table border=2 cellpadding=8> |
|---|
| 137 | <tr><td>Name</td><td> LogicalVolume</td><td> MotherVolume</td> |
|---|
| 138 | <td>Many</td><td> X0, Y0, Z0</td><td> Direction</td> |
|---|
| 139 | <td>StepSize</td><td> Unit</td><td> CopyNumber</td> |
|---|
| 140 | </tr> |
|---|
| 141 | </table> |
|---|
| 142 | <p> |
|---|
| 143 | Combined translation and rotation are also possible, placing an object |
|---|
| 144 | repeatedly on a ``cylindrical'' pattern. |
|---|
| 145 | Simple models of replicas and parametrised volume are also implemented. |
|---|
| 146 | In the replicas, a volume is slices to create new sub-volumes. |
|---|
| 147 | In parametrised volumes, several patterns of volumes can be created. |
|---|
| 148 | <P> |
|---|
| 149 | |
|---|
| 150 | <b>Generation of C++ code: <tt>MyDetectorConstruction.cc</tt></b> |
|---|
| 151 | <p> |
|---|
| 152 | By simply pushing a button, source code in the form of an include |
|---|
| 153 | file and a source file are created. |
|---|
| 154 | They are called <tt>MyDetectorConstruction.cc</tt> and <tt>.hh</tt> files. |
|---|
| 155 | They reflect all current user modifications in real-time. |
|---|
| 156 | <P> |
|---|
| 157 | |
|---|
| 158 | <b>Visualization</b> |
|---|
| 159 | <p> |
|---|
| 160 | Examples of individual solids can be viewed with the help of DAWN. |
|---|
| 161 | The visualization of the whole geometry is be done after the compilation |
|---|
| 162 | of the source code <tt>MyDetectorConstruction.cc</tt> with appropriate |
|---|
| 163 | parts of Geant4. (In particular only the geometry and visualization, |
|---|
| 164 | together with the small other parts they depend on, are needed.) |
|---|
| 165 | </p> |
|---|
| 166 | |
|---|
| 167 | <hr><a href="../../../../Authors/html/subjectsToAuthors.html"> |
|---|
| 168 | <i>About the authors</a></i> </P> |
|---|
| 169 | |
|---|
| 170 | </body> |
|---|
| 171 | </html> |
|---|
