|Message: Re: G4VSolid::DistanceToOut(p,v,...) for p on surface?||Not Logged In (login)|
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Vladimir.Grichine@cern.ch wrote: > *** Discussion title: Geometry > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/geometry/696/1"@geant4-hn.slac.stanford.edu> > Subject: ...change this to be about your reply. > > Hi Rickard, > > >> When trying to debug the G4TessellatedSolid problems I reported in >> another thread here, I have run up against some other problems, >> concerning DistanceToOut(p,v,...) when p lies on a surface. >> The User's Guide for Toolkit developers states that DistanceToOut(p,v,...) >> should behave as follows: >> Return distance along the normalised vector v to the shape, from a point >> at an offset p inside or on the surface of the shape. Intersections with >> surfaces, when the point is not greater than kCarTolerance/2 from a >> surface, must be ignored. >> >> I interpret that so that if we are close to a surface like that, the >> function should return the distance to the next outgoing intersection, >> if there is one. >> > > What is written in the user documents is correct. > When the distance from surface is not greater than kCarTolerance/2 means > that you are on the surface, therefore DistanceToOut(p,v,...) must return > zero. > Aha, so what the documentation is saying is that if the point is close to ANY surface, then intersections with ALL surfaces should be ignored? I interpreted it as if only the intersections with the nearby surface should be ignored. The ANY/ALL interpretation makes much more sense when comparing with code. I guess the plural on the surfaces in the documentation actually carries meaning... Thanks for clearing that out, and sorry for making the sloppy interpretation. / Rickard Holmberg
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