> Hi All, > > Is it possible to use one node to "cut" a piece out of another one? In > Geant it was possible to overwrite one region of space occupied by an > object consisting of a certain material by another one consisting of > another material (the "only" option). In that way it was possible to > create complicated shapes by trimming the edges of simple shapes with > pieces of air, which are then invisible. It seems to me GEANT (I mean geant 3.21) never could do what you are speaking about. > > What I am trying to do is to make a drawing of a light guide that is > triangular on one side and circular on the other. The circular end is the > narrow end of a cone; the other end of this cone just circumscribes the > triangle. A TPGON unfortuately doesn't let you set the inner and outer > radii for each point independently, otherwise it would be easy. With C++ it is quite easy. For that you should take that TPGON class as a base one and create your own class derived from that Very likely you will have to provide only method to overload: void TPCON::SetPoints(Float_t *buff) This method is a few lines of code and looks as follows: void TPCON::SetPoints(Float_t *buff) { //*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*Create PCON points*-*-*-*-*-*-*-*-*-*-*-*-*-*-* //*-* ================== Int_t i, j; Int_t indx = 0; if (buff) { Int_t n = GetNumberOfDivisions()+1; //*-* We've to check whether the table does exist and create it //*-* since fCoTab/fSiTab are not saved with any TShape::Streamer function if (!fCoTab) MakeTableOfCoSin(); for (i = 0; i < fNz; i++) { for (j = 0; j < n; j++) { buff[indx++] = fRmin[i] * fCoTab[j]; buff[indx++] = fRmin[i] * fSiTab[j]; buff[indx++] = fDz[i]; } for (j = 0; j < n; j++) { buff[indx++] = fRmax[i] * fCoTab[j]; buff[indx++] = fRmax[i] * fSiTab[j]; buff[indx++] = fDz[i]; } } } I wonder any student can provide his/her own version. > > Anybody who knows how to solve this problem? Or is it simply not possible > in Root since it is not an AutoCad clone? It is simply possible because ROOT is C++ class library simply. No AutoCad will allow you to make some sort of improvement "by simple-mind user" though. With my best regards, Valery > > Thanks, > > -- Gerco > > Dr. C.J.G. Onderwater > Nuclear Physics Laboratory > 312 Loomis Laboratory of Physics > University of Illinois at Urbana-Champaign > 1110 West Green Street > Urbana, IL 61801-3080 > Phone : (217) 244-7363 > Fax : (217) 333-1215 > E-mail: onderwat@uiuc.edu > >
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