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Forum: Geometry
Re: Question Rotations of a box around a pivot (Maura E.M.)
Date: 18 May, 2016
From: michel maire <michel maire>

On Tue, 17 May 2016 23:31:19 GMT, Maura E.M. wrote:
> I am modeling the motion of a Linac lower jaws. To get the jaws out of
> the field each jaw is translated on a straight line in opposite
> directions by a known quantity. Then the jaws are rotated around a hinge
> to align the jaws internal side with the field (beam coming from the
> target).
> 
> I do not know how rotations around a pivot point are implemented with
> GEANT. I use Topas, which follows the same rules. Rotations occur around
> the center of gravity of the solid. This way I cannot get the side of
> the jaws aligned with the field. There must be a way of doing that.
> 
> I have attached a sketch that may help clarifying my problem. I
> apologize if it confuses the reader even more.
> 
> I would greatly appreciate some tips about rotations around a pivoting point.
> Thank you so much.
>   Best regards,
>           Maura 
>

  You may have a look to examples/extended/geometry/transforms

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/05/18/01.09-27995-016-05-18_at_10.02.25.png

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