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Question How to define simple solid cone? 

Keywords: how to create a solid cone
Forum: Geometry
Date: 19 Aug, 2007
From: Brad Oborn <bmo03@uow.edu.au>

Hi, sorry if this is a very stupid question - but how can I define a very simple solid cone?  If I use G4Cons and wish to make a pointed end (to make a perfect cone then I get run-time errors (because I have set the two radii to zero):
----------------------------------------------
ERROR - G4Cons()::G4Cons(): layer1
        Invalide values for radii ! -         pRmin1 = 0, pRmin2 = 0, pRmax1 = 0, pRmax2 = 0.0635

*** G4Exception : InvalidSetup
      issued by : G4Cons::G4Cons()
Invalid radii.
*** Fatal Exception *** core dump ***

*** G4Exception: Aborting execution ***

----------------------------------------

I notice that in the file: ....examples/advanced/medical_linac/src/MedLinacTargetAndFilterDecorator.cc this problem is worked around by setting one radius to a very small number:

-------------------------------------------------
    //-----------layer1-----------------------------
  G4double  layer1Rmax1 = 0.00000001*cm;

--------------------------------------------

Is this a limit of G4Cons?? Is there any other way of defining a simple solid cone??

Thanks, Brad.

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1 None: Re: How to define simple solid cone?   (Vladimir Grichine - 21 Aug, 2007)
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