gora@solar2.ucr.edu wrote: > > Hello everybody, > I am considering modifying the TMaterial class in ROOT in order to add > quantities of interest to gamma-ray astronomers, e.g., refractive index, > optical absorption coefficients, etc. At the same time I would like to > propagate these changes upwards, i.e., TGeometry should be aware of these > changes to TMaterial. Is there any easy way of telling ROOT to use my TMaterial > class rather than the built-in one or do I also have to extend TGeometry and > TROOT (for the global list of geometries). It seems not too difficult to go > ahead and extend all the classes, but I think there should be an easier way. > Any suggestions? Thanks in advance. > > Regards, > Gora Hi Gora, Simply derived a new class from TMaterial with your new attributes. You do not have to modify TGeometry. Rene Brun
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