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Idea Description of the angle 'alpha' in G4Para() 

Keywords: G4Para(), angle 'alpha'
Forum: Documentation and Examples
Date: 06 Apr, 2005
From: Kazuyoshi Furutaka <Kazuyoshi Furutaka>

Hi,

In the User's Guide for Application Developers (4.7.0), the variable
'alpha' of G4Para()
  G4Para(const G4String& pName,
    G4double  dx, G4double dy, G4double dz,
    G4double  alpha, G4double theta, G4double phi)
is described as an "Angle formed by the y axis and by the plane joining
the centre of the faces parallel to the z-x plane at -dy and +dy".

But looking at the created volumes using the constructor, there is no
faces parallel to the z-x plane (in general).
There seems to be two parallelograms parallel to the x-y plane, one
pair of sides parallel to the x axis and the other forming angle
'alpha' with respect to the y axis.

Is it better to describe 'alpha' as an "Angle formed by the y axis
and by a pair of sides of the parallelograms which are parallel to the
x-y plane"?  (if it's correct)


By the way, the description of G4Para() in SRM (and also in G4Para.hh)
reads
"... and the plane joinng the centre of the faces G4Parallel to...".
                   ~~~~~~                         ~~~~~~~~~~
(the latter occured again in the description of 'alpha')

Kazuyoshi

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1 None: Re: Description of the angle 'alpha' in G4Para()   (Vladimir Grichine - 06 Apr, 2005)
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