Tracking one Particle through a physical Volume

+-------------+                                               +----------##
| Geant 3.10  |               GEANT User's Guide              | TRAK130  ##
+-------------+                                               +----------##
                                   

Author(s) : R.Brun Submitted: 01.10.84 Origin : R.Brun,F.Bruyant,M.Maire Revised: 26.05.86

                           GTVOL Block Diagram
                                  

 Compute distance to next boundary
 based on linear extrapolation
 CALL GNEXT -> SNEXT,SAFETY
IF(ITRTYP=1)         CALL GTGAMA
         =2          CALL GTELEC
         =3          CALL GTNEUT
         =4          CALL GTHADR
         =5          CALL GTMUON
         =6          CALL GTNINO
2 =          INWVOL         = 0
                        CALL GUSTEP
Extrapolate track into new volume by EPSIL
CALL GMENEW / GINVOL
Is particle still in same volume ?
                                                             YES
CALL GUSTEP