Hi Michael,
You can convert a Geant geometry to Root geometry with the following
steps
1- run the interactive version of Geant and type the command;
Geant > rz/file 21 detector.geom on
This produces a Zebra RZ file detector.geom.
2- run the g2root program in $ROOTSYS/bin/g2root
g2root detector.geom detector.C
this converts the Zebra RZ file into a Root macro detector.C
3- run the following Root session;
Root > .x detector.C
Root > detector.Draw()
Root > c1.x3d() (this invokes the 3-d Root viewver)
Root > TFile f("detector.root","NEW") //open a new root file
Root > detector.Write() //Write the geometry
structure
Root > f.Write()
Note that the TNode structure currently in Root was not designed
as a replacement for a true geometry package. The idea was mainly to
draw
simple geometries in event display programs.
We are currently investigating several alternatives for a true &
efficient
geometry package supporting;
- a disk data base with storage of multiple geometry versions
- an interactive editor and viewer
- with 3-d views
- but also 2-d cut views
- with interfaces to existing or future MC such as Geant3 or Geant4
Rene Brun
Michael Katz-Hyman wrote:
>
> I am aware of those programs.
>
> Out old event display is written in Fortran and GEANT and our geometries
> are half way hard-coded into the FORTRAN. Under ROOT you can move in the
> ROOT Canvas to save as a macro under the file menu. Is there a GEANT
> routine that would essentially do the same for volumes created by GEANT?
>
> Thanks
> Michael Katz-Hyman
>
> On Wed, 30 Jun 1999, Valeri Fine (Faine) wrote:
>
> > There are many ways to do this depends of your goals.
> >
> > Go to
> >
> > http://root.cern.ch/root/Search.phtml
> >
> > and look for "g2root" and "gh2root"
> >
> > An example of another "home-made, but still ROOT-based" solution is present
> > on:
> >
> > http://www.star.bnl.gov/STAR/html/comp_l/root/html/St_geom_Maker.html
> >
> > With my regards,
> > Valery
> >
> >
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