[Halld-offline] reducing file sizes

[Matthew Shepherd]

I'm not so sure about this... if MCThrown is used in the *parametric*  
simulation of tracks then it needs to be there.  The calorimeter  
reconstruction attempts to flag hits produced by the interaction of  
charged particles with the calorimeter.

-Matt


On Oct 7, 2009, at 5:07 PM, Richard Jones wrote:

> Blake,
>
> All of the MC information about the event that was simulated is  
> stored in the <reaction> tag.  The <mctrajectory> tag only contains  
> cheat information about actual tracks going through the detector.  I  
> didn't write the DMCThrown class, but The term "MCThrown" would  
> suggest that it is only concerned with the original vertex, not with  
> what paths the particles took subsequently as they traversed the  
> detectors.  So I would say that you can wipe out the <mctrajectory>  
> tag and see no effect in the calorimeter reconstruction.
>
> -Richard J.
>
>
>
> Blake Leverington wrote:
>> ok, I think maybe I wasn't clear or there's something I don't  
>> understand. Since I'm doing background MC work I need to know what  
>> particle types and reactions pass my reconstruction cuts so I still  
>> probably need  <mctrajectory> tag. I assume this is where the  
>> DMCThrown information comes from.  But I was also under the  
>> impression that <reaction> contains information about the vertex  
>> and so on for reconstructing angles.
>>
>> -Blake
>>
>> Richard Jones wrote:
>>
>>> Blake,
>>>
>>> The rules are simple: just cut out entire tags (anything goes) to  
>>> kill what you don't want.  I think this is too clear to risk  
>>> mistakes.  Simply if you kill a tag then all of its contents  
>>> disappear with it.  It sounds to me like you still want to kill  
>>> the <reaction> ... </reaction> tag and the  
>>> <mctrajectory>..</.mctrajectory> tag.  After that, you are down to  
>>> basically just what you want.
>>>
>>> -Richard J.
>>>
>>> Blake Leverington wrote:
>>>
>>>> Hi Richard,
>>>>
>>>> Ok, I followed your instructions and everything went smoothly, so  
>>>> thank you. I ended up with a 70% reduction in my files sizes,  
>>>> 165MB down to 51MB. I've attached my edited hddm header file,  
>>>> could you take a quick look to see if there is anything else I  
>>>> could cut out? I think I took out everything unwanted, I think,   
>>>> but I'm not familiar enough with the hddm formatting.  All I  
>>>> require is photon reconstruction in the FCAL and BCAL and the  
>>>> truth information.
>>>>
>>>> Cheers,
>>>> -Blake
>>>>
>>>>
>
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