What is the maximum number of regions allowed in FLUKA?
The maximum number of regions is 1000, but can be increased to 20000 by means of option GLOBAL (WHAT(1)). Using the LATTICE option in the geometry, however, it is possible to define regions as copies obtained by geometric transformations (rotations and translations). The number of such copies is unlimited, within the available computer memory. Detailed descriptions how to use LATTICE can be found in the support material of the FLUKA courses.