Problem 512

Summary: how set max step size for only certain particles?
Product: Geant4 Reporter: bloser
Component: trackingAssignee: John Apostolakis <John.Apostolakis>
Status: RESOLVED WONTFIX    
Severity: minor    
Priority: P3    
Version: 5.0   
Hardware: PC   
OS: Linux   

Description bloser 2003-07-21 18:24:59 CEST 
I want to set the max step size only for certain particles.  From the
documentation, it doesn't seem that you can do this - have I missed something?
I understand how to set, say, the maximum track length only for, e.g., electrons
and positrons, but setting the maximum step size for a volume seems to apply to
all particle in that volume.  This makes the simulations very slow; ideally, I
want to track electrons and positrons with a very small step size, but let
photons travel through the volume with their normal step size.
Comment 1 Michel.Maire 2003-08-10 08:17:59 CEST 
do not use the UserLimit class, but set the stepMax as a full process.
This is demonstrated in examples/extended/electromagnetic/TestEm5 or TestEm7.

The process is in the StepMax class. You can register this process only in the
physics list of some particles, or take advantage of the function IsApplicable()