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Forum: Geometry
Re: Question Union of a solid and a parameterized Volume (roccaz)
Re: None Re: Union of a solid and a parameterized Volume (John Apostolakis)
Date: 06 Nov, 2007
From: <Jerome.ROCCAZ@CEA.FR>

Thank you for your quick reply John that confirm what I have understood with the manual. I solved my problem by using one parameterised volume instead of a union with a parameterised one and another solid.

To be more precise, I simulate a germanium cristal that is a kind of tub but curved at its bottom : so I wanted to use a tub for the main part of the cristal and a parametrised tub for the bottom part and "fuse" them by a logical union. So in fact I used one parameterised Tub for the entire cristal.

By the way, if I had to simulate another geometry for which it is not possible to use one single parameterised volume to describe it, what is the solution? Build each part of the geometry and declare each as a sensitive detector (in the case of course if the entire geometry is a sensitive detector)?

thanks

-----Message d'origine-----
De : John Apostolakis [mailto:john.apostolakis@cern.ch] 
Envoyé : lundi 5 novembre 2007 11:50
À : ROCCAZ Jerome 603778
Cc : PublicHyperNews@slac.stanford.edu
Objet : Re: Union of a solid and a parameterized Volume

Dear Jerome,

Your request is a little unclear, so please excuse if I reiterate some 
basic concepts, which are key to creating a geometry.  If this does not 
answer your question, please provide further information, and we will 
try to do this.

- The solid is the shape of a volume, and it can be a box, a polycone or 
a boolean solid (the result of an operation between two other solids.)

- Only when you have a solid can you create a logical volume, which add 
a material, visualisation properties (optional), a field (optional) and 
other attributes.

- A physical volume represents one (or a set of) these logical volumes 
which has/have been placed each in a particular location.

So the two concepts and classes, physical volumes (including 
parameterised volumes) and solids, are completely separate.  You cannot 
use a parameterised volume (which is a type of physical volume) as one 
part of a solid. It is the wrong type.

If you could explain further what you want to achieve, it could be 
possible to suggest how to implement it. 

Best regards,
John Apostolakis

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