| Previous Topic | Next Topic | Contents | Features |
Zones are regions of space defined by combinations of bodies. Zone descriptions consist of a list of signed body numbers and Boolean operators. Each body number is separated from the next body number in the list by either an implicit intersection operator or the union operator ":''. A positive body number (denoted with either an explicit + or the absence of a -) represents the space contained within that body.
A negative body number refers to the volume outside of that body. A list of signed body numbers is the intersection of the respective volumes. A description may consist of a single body.
The complement operator # is not supported for body based zone descriptions. (If it is used, Sabrina will complain, the geometry will not be displayed correctly, but the conversion to MCNP surface mode will probably be correct.)