|Message: Re: Problem with subtraction of two polycones||Not Logged In (login)|
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From the perspective of geometry/tracking both setups it should work either way. However in almost all cases it will be more efficient to place a daughter volume inside the bigger volume (solid1) instead of using subtraction. It will lead to fewer geometry operations and can result in improved tracking time - in particular if this volume is important in the setup. Best regards, John Aram Teymurazyan wrote: > *** Discussion title: Geometry > > On Tue, 20 May 2008 11:39:17 GMT, John Allison wrote: > > >> The boolean processor for visualisation fails because one volume is >> entirely inside the other. This is not a situation that should happen. >> To get what you want simply make the smaller volume a daughter of the >> larger one; the Geant4 convention is that the daughter replaces - and >> hence effectively subtracts from - the volume of the mother. The mother >> has the material of the container (iron, say) and the daughter has the >> material of the interior (air, say). >> > > Hello John, > > So can I interpret you message as: "One should not create a new solid > using G4SubtractionSolid("newSolid", solid1, solid2) if solid2 can > completely fit inside of solid1"? > > thanks, -Aram > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/904/1/2.html >