| 1 | <html> |
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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: 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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| 18 | <IMG SRC="../../../../resources/html/IconsGIF/Next.gif" ALT="Next"></a> |
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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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