Hello Francois. > - Why nothing about 3D ? Coming to this point, the status of ROOT about > 3D to-day seems strange : Why is it possible to do such a complicated thing > as moving in 3D an object like a TGTRA and impossible to simply define such > simple objects like a 3d line ? I have not seen yet the documentation you are speaking about but I think there is no big problem to define 3D lines within ROOT. For example TPolyLine3D class does this (see macro $ROOTSYS/tutorials/basic3d.C) In libStar one can find several extra 3D primitives. I have to admit ROOT Web site doesn't provide examples to show how they can be used. See for example: http://www.star.bnl.gov/STAR/html/comp_l/root/html/TPolyLineShape.html#TPolyLineShape:description
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