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None Re[2]: What is a rigth way to construct regular geometry structures? 

Forum: Geometry
Re: Question What is a rigth way to construct regular geometry structures? (Anton)
Re: None Re: What is a rigth way to construct regular geometry structures? (John Allison)
Date: 22 Sep, 2006
From: Anton <Anton>

Hello John,
Thanks for quick reply,

It is all clear for me now about visualisation and tracking
efficiency.

> However, having said that, I see no reason why the tracking should not
> be effectively identical. But I am not qualified to judge this. Could
> you please post more details of the different results of simulation?
I agree with you, that geometry builded by this two way must be
identical for particle tracking.
So, more information about simulation:
I simulate propagation of positrons though absorbers which presented
by regular structure. Typical simulation geometry like this:

                 --------   []
                 --------   []
                 --------   []            ->
       [*]       --------   []            B
                 --------   []
                 --------   []
                 --------   []
      Source
      of e+      Absorber  Detector
                                      ->
Also setup placed in magnetic field  (B ).

A purpose of simulation is count of amount of positrons arriving to
detector.

This is results:
(for two types of cell of regular structure - hexa and quad, and two
ways of geometry building - by multiple unions and multiple
placements).

Geometry_type   multiple_unions   multiple_placements

   hexa cells       863                   568

    quad cell       812                   505

As you can see difference is ~ 50%.

I perform simulation by geant4.8.1.ref02 from CERN AFS.

Also I can send you source code for more details.
      
-- 
Best regards,
 Anton                            mailto:tosha_korneev@tut.by

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