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