BiotSavart 3.2 User's Guide

The Field menu controls the recalculation of magnetic field.

AutoRecompute If ticked, the program will recalculate the magnetic field whenever a conductor or probe is altered. Selecting AutoRecompute will toggle it between ticked and not ticked. Ticking it when the field needs to be recalculated will initiate the recalculation.
Note that creating a new object will disable AutoRecompute.
Recompute (cmd-R) Used to trigger recalculation if AutoRecompute is not ticked. The Recompute command will only be enabled when the field needs to be recalculated. Use this manual trigger if you want to make changes to several conductors between recalculations.