|Message: Re: Rotations of a box around a pivot||Not Logged In (login)|
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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