|Message: Re: Need help with overlap||Not Logged In (login)|
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Hi Sam, if your box is placed inside the hollow of 'ElecBotAC_log', then its mother volume should be ElecBotAC_log's mother. Cheers, Gabriele -------------- On Mon, 31 Oct 2016 15:15:11 GMT, Sambid Wasti wrote: > Hi everyone, > > I am relatively new to Geant4. I did a geometry test and i got few > overlap errors. The first overlap is shown as following: > > ..... > Checking overlaps for volume av_3_impr_1_LGBotAC_log_pv_3 ... OK! > Checking overlaps for volume av_3_impr_1_AlTopBotAC_log_pv_6 ... OK! > Checking overlaps for volume av_3_impr_1_ElecBotAC_log_pv_7 ... OK! > Checking overlaps for volume ElecBotAC22_phy ... > -------- WWWW ------- G4Exception-START -------- WWWW ------- > *** G4Exception : GeomVol1002 > issued by : G4PVPlacement::CheckOverlaps() > Overlap with mother volume ! > Overlap is detected for volume ElecBotAC2_phy > with its mother volume ElecBotAC_log > at mother local point (25.159,-21.1087,-0.5), overlapping by at least: 2.48 cm > NOTE: Reached maximum fixed number -1- of overlaps reports for this volume ! > *** This is just a warning message. *** > ..... > > So, i went to my detector constructions and looked at the two volumes. > ElecBotAC2_phy and ElecBotAC_log. The code is as following: > > .... > // Electronics box > // > G4double ElecBotAC_X = 101.6*mm; > G4double ElecBotAC_Y = 98.4*mm; > G4double ElecBotAC_Z = 51.6*mm; > G4VSolid* ElecBotAC_sol = new G4Box( "ElecBotAC_sol", 0.5 * ElecBotAC_X, 0.5 * ElecBotAC_Y, 0.5 * ElecBotAC_Z ); > > // subtract inside volume > G4double ElecBotAC1_X = ElecBotAC_X - 1.0*mm; > G4double ElecBotAC1_Y = ElecBotAC_Y - 1.0*mm; > G4double ElecBotAC1_Z = ElecBotAC_Z - 1.0*mm; > G4Box* ElecBotAC1_box = new G4Box( "ElecBotAC1_box", 0.5 * ElecBotAC1_X, 0.5 * ElecBotAC1_Y, 0.5 * ElecBotAC1_Z ); > G4ThreeVector ElecBotAC1_pos = G4ThreeVector( 0., 0., 0. ); > ElecBotAC_sol = new G4SubtractionSolid( "ElecBotAC_sol", ElecBotAC_sol, ElecBotAC1_box, 0, ElecBotAC1_pos ); > > // electronics box logical volume > G4LogicalVolume* ElecBotAC_log = new G4LogicalVolume( ElecBotAC_sol, mAl6061, "ElecBotAC_log", 0, 0, 0 ); > > // add PC board > G4double ElecBotAC2_X = 2. * 25.4*mm; > G4double ElecBotAC2_Y = 2. * 25.4*mm; > G4double ElecBotAC2_Z = 1.0*mm; > G4Box* ElecBotAC2_box = new G4Box( "ElecBotAC2_box", 0.5 * ElecBotAC2_X, 0.5 * ElecBotAC2_Y, 0.5 * ElecBotAC2_Z ); > G4LogicalVolume* ElecBotAC2_log = new G4LogicalVolume( ElecBotAC2_box, mPC, "ElecBotAC2_log", 0, 0, 0 ); > G4ThreeVector ElecBotAC2_pos = G4ThreeVector( 0., 0., 0. ); > new G4PVPlacement( 0, ElecBotAC2_pos, ElecBotAC2_log, "ElecBotAC2_phy", ElecBotAC_log, false, 0); > .... > > I just have a box in a hollow box and the dimensions are not even close > so i do not understand why i am getting an overlap issue here. Is there > some basic stuffs that i am overlooking or i do not understand. Please > help > > -Sam-
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