Hi Nicolas, I agree with your point. We will make the change to something like: -by default we start at the origin of coordinates -if the argument option="start", we start at the current point set via gGeoManager->SetCurrentPoint(x,y,z) Rene Brun On Thu, 26 Feb 2004, Nicolas Produit wrote: > Hi, > > I have to compute the amount of material that a straight line crossed > depending on its entry point and it direction. > > I think that TGeoChecker::LegoPlot is just doing what I need. > > But looking into the code of: > > > TH2F *TGeoChecker::LegoPlot(Int_t ntheta, Double_t themin, Double_t themax, > Int_t nphi, Double_t phimin, Double_t phimax, > Double_t /*rmin*/, Double_t /*rmax*/, Option_t *option) > > > it seems that the start point of all tracks is just choosen arbitrarily at coordinates: > start[0] = start[1] = start[2] = 1E-3; > > It would be handy to be able to give the start point in the call. > > Thanks > > >
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