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Forum: Documentation and Examples
Re: Question DNAPhysics: Ionisation coordinates out of box (satya)
Re: None Re: DNAPhysics: Ionisation coordinates out of box (Michael H. Kelsey)
Re: None Re: DNAPhysics: Ionisation coordinates out of box (satya)
Date: 13 Aug, 2012
From: Michael H. Kelsey <Michael H. Kelsey>

satya writes:
> Thanks for your response. My Detector Construction class:
> 
> // WORLD VOLUME
>   WorldSizeX  = 1*cm;
>   WorldSizeY  = WorldSizeX;
>   WorldSizeZ  = WorldSizeX;
> 
>   solidWorld = new G4Box("World",                     //its name
>                WorldSizeX/2,WorldSizeY/2,WorldSizeZ/2);  //its size
> 
>   logicWorld = new G4LogicalVolume(solidWorld,            //its solid
>                    waterMaterial,    //its material
>                    "World");        //its name
> 
>   physiWorld = new G4PVPlacement(0,            //no rotation
>                    G4ThreeVector(),    //at (0,0,0)
>                                  "World",        //its name
>                                  logicWorld,        //its logical volume
>                                  0,            //its mother  volume
>                                  false,            //no boolean operation
>                                  0);            //copy numb
> 
>  This means that the coordinates will be dispersed in the range of
> -0.5<=X<=0.5, -0.5<=Y<=0.5 and -0.5<=Z<=0.5,

Technically, in the range -0.5*cm <= X <= 0.5*cm, and so on.  If you print
the coordinates without units, you will get values in GEANT4 "internal"
units.  So you would print, e.g.,

  cout << " My hit @ " << hitX/cm << " " << hitY/cm << " " << hitZ/cm << endl;

> with the center of the box as Origin. Please correct me if I am wrong.

Yes, you are correct.
      -- Michael Kelsey

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