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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

Hi Daniel, 

In your GitHub area for Forward Simulation and Tracking, 
https://github.com/jdbrice/star-fwd-dev  
I see the FST+sTGC combined fast simulator (StFtsFastSimulatorMaker) is being 
used. 

When I look into Te-Chuan’s work area on RCF 
/star/u/tchuang/FST_simulations/README

************************
    - There are two versions of fast simulator:
        - StFtsFastSimulatorMaker: Old fast simulator which has been updated 
for silicon part but STGC part was obsoleted.
            - Use runFtsSim.C to run the fast simulator.
            - I added some QA histograms about secondary particles in g2t 
tables. You can see the variable "isShower" declared at line 539 and 
histograms called "hTrutHitRShower[i]" which are the variable
 isShower vs. the mc truth hit position in r direction on different FST disks.
        - StSiSimulatorMaker and StStgcSimulatorMaker: Separated fast 
simulator for FST and STGC done by Daniel (dbrandenburg.ufl AT gmail.com)
            - I copied these codes from Daniel's directory. I have checked 
StSiSimulatorMaker that is updated and I believe StStgcSimulatorMaker is also 
updated.
            - Use sim.C to run the fast simulator.
            - Daniel didn't consider FST inefficiency in sim.C but you can 
see how to implement this in runFtsSim.C.
************************

So I am wondering which version is the latest version. I tend to believe the 
separated ones are, because we have discussed about this in some meetings a 
while back (last year), and I believe we have agreed to split the two. But 
then I don’t understand why the combined version is in GitHub.

Also, can you tell me if there is any difference between the combined and 
separated fast simulator for how the FST hits are handled (how the hits are 
smeared, what hit error matrix is put in etc)?

Thanks,
Zhenyu