GEOM010 Tracking inside volumes and optimisation

The tracking of particles through the geometrical data structure is the key functionality of GEANT. At every particle's step, the program must find the volume where the particle is ( GTMEDI) and the next boundary it will cross ( GTNEXT). This can take about $60$ of the total simulation time (even for detectors described in an optimized way); therefore, a new logic has been introduced to minimize the time spent for the search in the geometrical tree.

• Virtual divisions
• Other optimisation tools