A geometrical method for 3-D modeling of the magnetic field in scaling and non-scaling FFAG magnets has been
installed in the ray-tracing code Zgoubi.
The method in particular allows a good simulation of transverse non-linearities,
of field fall-offs and possible merging fields in
configurations of neighboring magnets, while using realistic models of magnetic fields.
That yields an efficient tool for FFAG lattice design and optimizations, and for 6-D tracking studies.
It is applied for illustration to the simulation of an acceleration cycle in a 150~MeV radial sector proton FFAG.
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