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2 | <head> |
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3 | <title>ADG: Geometry</title> |
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5 | |
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6 | <!-- Changed by: Gabriele Cosmo, 18-Apr-2005 --> |
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7 | <!-- $Id: geomIntro.html,v 1.2 2006/06/09 13:59:31 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 | <IMG SRC="../../../../resources/html/IconsGIF/PreviousGR.gif" ALT="Previous"></a> |
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17 | <a href="geomSolids.html"> |
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19 | </td> |
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20 | <td ALIGN="Right"> |
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21 | <font SIZE="-1" COLOR="#238E23"> |
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22 | <b>Geant4 User's Guide</b> |
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23 | <br> |
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24 | <b>For Application Developers</b> |
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25 | <br> |
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26 | <b>Geometry</b> |
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27 | </font> |
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28 | </td> |
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29 | </tr></table> |
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30 | <br><br> |
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31 | |
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32 | <a name="4.1.1"> |
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33 | <h2>4.1.1 Introduction</h2></a> |
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34 | |
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35 | <p> |
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36 | The detector definition requires the representation of its geometrical |
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37 | elements, their materials and electronics properties, together with |
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38 | visualization attributes and user defined properties. The geometrical |
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39 | representation of detector elements focuses on the definition of solid |
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40 | models and their spatial position, as well as their logical relations |
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41 | to one another, such as in the case of containment. |
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42 | </p> |
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43 | <p> |
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44 | Geant4 uses the concept of "Logical Volume" to manage the representation |
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45 | of detector element properties. The concept of "Physical Volume" is used |
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46 | to manage the representation of the spatial positioning of detector |
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47 | elements and their logical relations. The concept of "Solid" is used |
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48 | to manage the representation of the detector element solid modeling. |
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49 | </p> |
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50 | <p> |
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51 | The Geant4 solid modeler is STEP compliant. STEP is the ISO standard defining |
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52 | the protocol for exchanging geometrical data between CAD systems. This is |
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53 | achieved by standardizing the representation of solid models via the EXPRESS |
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54 | object definition language, which is part of the STEP ISO standard.</p> |
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55 | |
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56 | |
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57 | <hr><a href="../../../../Authors/html/subjectsToAuthors.html"> |
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58 | <i>About the authors</a></i> </P> |
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59 | |
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60 | </body> |
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61 | </html> |
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