[Frost] gsim and rootbeer issues

[Michael Dugger]

Hi,

GSIM issue:
GSIM is smearing the target vertex wrong. The event generator I use sets 
all of my reaction vertexes at 0,0,0 but after gsim the target is smeared 
and the center ends up being at approximately + 4cm.

In the gsim_frost.ffread file, the target center is set to zero:
TGPOS 0.0 0.0 0.0

The start counter offset:
STZOFF 4.0
is the same as the offset I am seeing for the vertexes. Is this just a 
coincidence?

The way I determine that the target is offset by 4 cm is by looking at 
vertex from MVRT and TBTR (passed through GPID). I am having difficulties 
plotting directly from MCVX (more on this later). I spot checked the MCVX 
bank from the event generator to make sure the vertex was always at zero. 
When I bosdump the output from gsim_bat (on the Jlab CUE) the 
smeared vertex from MCVX appears to be consistently shifted downstream 
consistent with the shift being about 4 cm.

ROOTBEER issue:
When I print out the MCTK_NH or MCVX_NH variables I always get 0. I have 
checked that the root file I process has the MCTK and MCVX banks by 
looking at the output of the bankdump command. When I try to compile the 
code accessing individual members of the banks (MCTK and MCVX), I get 
errors like:
/home/dugger/g9Ana/test/testDST.C:348: error: request for member z in * 
MCVX, which is of non-class type MCVX_t*

The code I am using has for the bank definitions:
char *mybanks[]={"RUNC","GPID","MVRT","BEAM","TAGR","TGBI","null","MCVX","MCTK"};

And I try to access the z-vertex of the MCVX bank like this:
hVertMCVX->Fill(MCVX[0].z);

Should I be accessing the z-vertex from MCVX in a different way?

Thanks for your time.

Sincerely,
Michael