Optical Photon Processes in GEANT4 - Cern
Optical Photon Processes in GEANT4 - Cern
Optical Photon Processes in GEANT4 - Cern
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Surface ConceptSplit <strong>in</strong>to two classes• Conceptual class: G4LogicalSurface (<strong>in</strong> thegeometry category) holds:(i) po<strong>in</strong>ters to the relevant physical or logicalvolumes(ii) po<strong>in</strong>ter to a G4<strong>Optical</strong>SurfaceThese classes are stored <strong>in</strong> a table and can beretrieved by specify<strong>in</strong>g:(i) an ordered pair of physical volumes touch<strong>in</strong>gat the surface [G4LogicalBorderSurface] - <strong>in</strong>pr<strong>in</strong>ciple allows for different propertiesdepend<strong>in</strong>g on which direction the photonarrives.(ii) a logical volume entirely surrounded by thissurface [G4LogicalSk<strong>in</strong>Surface] - usefulwhen the volume is coded by a reflector andplaced <strong>in</strong>to many volumes (limitation: onlyone and the same optical property for all theenclosed volume’s sides).(b) Physical class: G4<strong>Optical</strong>Surface (<strong>in</strong> thematerial category) keeps <strong>in</strong>formation about thephysical properties of the surface itself.14
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