|Message: cylinder overlapping||Not Logged In (login)|
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Hello I am a new user of GEANT4 and I am implementing the geometry of my detector. I tested it with DAVID to see if there was no bug and I have a problem : I need to define 2 cylinders like this (in meter) : G4double cyl1_demieH = 5.e-3; G4double cyl1_Rayon_Ext = 1.e-2; G4double cyl1_Rayon_Int = 0; G4double pos_cyl1_x = 0; G4double pos_cyl1_y = 0; G4double pos_cyl1_z = 0; G4double cyl2_demieH = 0.2e-3; G4double cyl2_Rayon_Ext = 1.e-2; G4double cyl2_Rayon_Int = 0; G4double pos_cyl2_x = 0; G4double pos_cyl2_y = pos_cyl1_y + cyl2_demieH + cyl1_demieH; G4double pos_cyl2_z = 0; The two cylinders are rotated (axe X, angle Pi/2) : they are along the Y axis They normally just touch. When I use DAVID, they overlap ! But if I just change the thickness of the cylinder 2 (cyl2_demieH = 1e-2), there is no overlapping any more. Or, if I just change my code deleting the rotation and doing the translation along the Z-axis, there is no overlapping any more too. I don't understand what's happening. Where does this bug comme from ? my geometry, GEANT4 or DAVID ? It may be quite a stupid question but I really appreciate if someone can give me an answer. Thank you a lot in advance, Marie-Anne
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