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Dear Amanda, The constructor you are using for G4LogicalVolume is correct. G4LogicalVolume( G4VSolid* pSolid, G4Material* pMaterial, const G4String& Name, ... It seems that one of the parameters you are passing to it is not of the type expected. Likely the material 'Ar' is not a pointer to a material ? Else maybe you did not include the G4LogicalVolume.hh header file ? If neither of these suggestions help, please look a bit more and then post the compiler error that you get. Best regards, John On Feb 18, 2010, at 12:37 AM, Amanda Leung wrote: > > *** Discussion title: Geometry > > I created a G4TessellatedSolid, but I am having trouble to place it > into > a Logical Volume. > > First I used this function: > > G4LogicalVolume* experimentalHall_log > = new G4LogicalVolume(experimentalHall_box,Ar,"expHall_log"); > > But it gives me an error. > > So I tried to use this example: > > G4LogicalVolume( G4VSolid* pSolid, > G4Material* pMaterial, > const G4String& Name, > G4FieldManager* pFieldMgr=0, > G4VSensitiveDetector* pSDetector=0, > G4UserLimits* pULimits=0, > G4bool Optimise=true ) > > Should I use the second one instead? > > Therefore, I want to ask how can I add material onto > G4TessellatedSolid? > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply > or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1019.html