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99 lines
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<TITLE>Geant4 volumes hierarchy</TITLE>
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<H3><A NAME="SECTION00212100000000000000">
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Geant4 volumes hierarchy</A>
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There are three types of volumes in Geant4 , and can arrange them in order to build a recursive hierarchy, or a tree, that defines the detector. They are organized as the creation process of a detector component.
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<UL>
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<LI>Base volume: it is the pure geometrical definition of a detector component. For example, a box, a cylinder, a polyhedra ...and the dimensions i.e. it is the component project on paper.
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</LI>
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<LI>Logical volume: it is the definition of the detector component obtained combining the geometric definition and the material, i.e. it is the component at the exit of the workshop.
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</LI>
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<LI>Physical volume: it is a logical volume that recieved a placement (center position vector and space transformation like rotation, translation ...) in a mother volume, i.e. it is the component introduced in the detector.
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</LI>
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The mother volume of a physical volume is always a logical volume, expect for the main physical volume, which is the ``World'', the experimental hall volume. Therefore, a recursive hierarchy is possible. A physical volume C will be put in a logical volume B, at a certain position and with a certain orientation. The physical volume B will be the placement of the B logical volume (including the physical volume C) into a logical volume A, and so on.
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<ADDRESS>
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2005-12-21
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