Re: truth points from hdgeant

[David Lawrence <davidl@jlab.org>]

Hi Mark,

    The so called "truth" information is contained in several objects in 
DANA. These include:

DMCThrown
DMCTrackHit
DBCALTruthShower
DFCALTruthShower
DMCTrajectoryPoint
DTOFTruth
DSCTruthHit

where the DMCTrackHit objects contain truth hits for several detectors 
including the CDC and FDC.

The s_HDDM_t pointer is purposely kept opaque so that the reconstruction 
code remains agnostic as to the underlying file format. I would strongly 
urge cautious movement here since we need to maintain this due to the 
differing online and simulation file formats.

However, if you must get get at the s_HDDM_t pointer, here's how you 
could do it:

s_HDDM_t *hddm_s = (s_HDDM_t*)loop->GetJEvent()->GetRef();

Regards,
-David

Mark M. Ito wrote:
> Folks,
>
> In Dana, is there a way to get at the truth points generated by 
> hdgeant? Alternately, is there a way to get at the raw hddm structures 
> themselves?
>
>  -- Mark
>

-- 

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