|Message: Re: Overlap with mother volume !||Not Logged In (login)|
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Dear Ioan-Charly I am pleased to see that you have run the geometry checking functions, in order to verify your setup. It is an important check, and I would recommend it both for consistency checking (preventative) and for diagnosing what appear to be unexpected physics results. It is very possible that unexpected physics results are due to a geometry error of this type. Please find below some feedback and suggestions for fixing the problem underlying these error messages. John =================================================== John Apostolakis, PH Department, CERN On Aug 5, 2014, at 1:00 AM, Ioan-Charly <email@example.com> wrote: > > *** Discussion title: Geometry > > Hi, > > For me i have a simple geometry three tubs of 10mm radius and 5um thick > for the first one, 400um for the second one and for the last one 5cm. > > When i run the command /geometry/test/run, i have this message : > > Running geometry overlaps check... > Checking overlaps for volume Wtarget ... > -------- WWWW ------- G4Exception-START -------- WWWW ------- > *** G4Exception : GeomVol1002 > issued by : G4PVPlacement::CheckOverlaps() > Overlap with mother volume ! > Overlap is detected for volume Wtarget > with its mother volume world > at mother local point (4.95596,-6.80934,-0.505002), overlapping by at least: 6.80934 mm > NOTE: Reached maximum fixed number -1- of overlaps reports for this volume ! > *** This is just a warning message. *** > -------- WWWW -------- G4Exception-END --------- WWWW ------- Please check where you have placed the volume Wtarget. It is protruding by 6.8 mm outside its parent (mother) volume. The point where it is protruding is at location (4.95596,-6.80934,-0.505002) in the coordinate system of the mother volume. Once you have understood why this happens ( is it due to an incorrect location or rotation, or is it simply a larger volume than you meant to create ), you can adjust the relevant parameter. The remaining problems are similar. The key words are 'Overlap with mother volume ! ' which explain the type of overlap found. Good luck in identifying the issue, and correcting it. > Checking overlaps for volume Windtarget ... > -------- WWWW ------- G4Exception-START -------- WWWW ------- > > I am interested of the geometry management because i had some strange > result... Indeed, when i gun some electron of 0.1MeV the azimuthal > distribution are not uniform. However, it must be! > > How can i fix this overlap and > [Is it] possible that the "strange" result is caused by the overlap ? Yes, physics results are altered by errors in the geometry of this type. Regards, John > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1363.html
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