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Forum: Geometry
Re: Question Minimum distance between two surfaces to decide rod length (Davinder Siwal)
Date: 10 Jan, 2014
From: John Apostolakis <John Apostolakis>

Since you have the locations of the centers of all the rings, you should be able to use them to calculate the location of the centre point of each rod, and calculate the orientation of the transformation.

But likely you can define the rotation required directly by knowing the angle at which each part is placed and the axis around which the rotation is made.

In many cases it can be useful to define a local coordinate system to make this easier to use.

In your case you may also consider to put together the rod and one ring of an iron support into an Assembly volume, and then create a copy or imprint for each of the arms of the pentagon.

Best regards,
John
===================================================


On Jan 8, 2014, at 1:00 PM, Davinder Siwal wrote:

> 
> *** Discussion title: Geometry
> 
> Dear Geant4 Experts
> 
> I am trying to build an array of liquid scintillator detectors, for
> which the support structure is to be build. So I made the structure as
> shown in the attached file in which there are five circular iron support
> structure surrounds the central one in a pentagon shape. I would like to
> interconnect them with a iron rod having inner diameter as 12mm and
> outer diameter as 20mm. The question is how do I calculate the minimum
> distance between the two structure to decide the rod length ???
> Presently I have all the co-ordinates of the centre of all the rings in
> the experimental hall.
> 
> Presently the five rings has 15degree polar angle with central ring. So,
> now once the rod length is calculated then how do I calculate the
> orientation of the rod length with respect to the experimental hall??
> 
> Presently experimental hall is the mother volume for all the rings.
> 
> I would appreciate if any one can help me for the above issues.
> 
> Thanks !!!
> 
>   Attachment:
>      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/01/08/03.46-29569-support_structure.jpg
> 
> -------------------------------------------------------------
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> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1316.html 

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