Surfaces with TGeom


The geometry package in ROOT handles volumes. I was wondering how to deal with surfaces. For example, I would like to compute energy deposition on a surface of a detector. Of course, one way of doing it is to use a very thin volume (but how thin is thin?) but it seems to me not the right way of doing it (waht is the thickness I should provide?).

Thanks for your help



It really depends on what kind of process you are trying to simulate. You can certainly intercept a boundary crossing (when you do the propagation) in ROOT geometry. It makes sense to embed a surface in a volume if you have a physics quantity proportional to the path length, otherwise you just detect the entrance point and apply your scoring algorithm. Anyway sizes in the geometry are safe down to 1E-7 - 10E-8

Cheers, Andrei