[Gate-users] generic trapezoid volume (pinhole)

[David Sarrut]

Hello,

there is no user macro in Gate allowing objects substraction. The best
approach may be to code directly in C++ by creating a specific volume type
(inheriting from GateVVolume, look for example GateBox).

Sincerely,
David


On Wed, May 28, 2014 at 6:59 AM, Tasneem Rahman <
Tasneem.Rahman at student.adfa.edu.au> wrote:

>  Hi John,
>
>
>
> Can you please tell me how can I subtract objects from one another in
> Gate_v6.1? For instance if I make one solid box and if I make another
> cylinder as a daughter of the box, then can I subtract the cylinder from
> the box? Will it make a hole like that? Please let me know. Thanks.
>
>
>
> Cheers,
>
>
>
> Smita
>
>
>
> *From:* gate-users-bounces at lists.opengatecollaboration.org [mailto:
> gate-users-bounces at lists.opengatecollaboration.org] *On Behalf Of *John
> Apostolakis
> *Sent:* Wednesday, 28 May 2014 3:25 AM
> *To:* Débora Salvado
> *Cc:* <gate-users at lists.opengatecollaboration.org>
> *Subject:* Re: [Gate-users] generic trapezoid volume (pinhole)
>
>
>
> I am not sure if this will help:
>
>
>
> If all your pinholes are the same shape (or can be created by subtracting
> the same "generic trapezoid" shape from the bigger shape) then in Geant4 at
> least you only need to define one 'solid'.
>
>
>
> Then you subtract it multiple times, with each copy positioned at a
> different location and/or with a different orientation.  ( The orientation
> will be governed by the rotation matrix and the translation that you give
> it.)
>
>
>
> I hope that I understood your issue - or that someone else can add the
> specialised GATE knowledge necessary to give better advice.
>
>
>
> Regards,
>
> John
>
> ===================================================
>
>
>
> On May 27, 2014, at 5:50 PM, Débora Salvado wrote:
>
>
>
>    Dear GATE users,
>
> I'm trying to use the "generic trapezoid" volume to define a multi-pinhole
> collimator, with each pinhole focusing different parts of the FOV.
>
> Consider the following set-up:
>
> /gate/world/daughters/name trap1
> /gate/world/daughters/insert  trap
> /gate/trap1/geometry/setDx1   26. mm
> /gate/trap1/geometry/setDx2   26. mm
> /gate/trap1/geometry/setDz    5. mm
> /gate/trap1/geometry/setTheta 0. deg
> /gate/trap1/geometry/setDy1   26. mm
> /gate/trap1/geometry/setDy2   21. mm
> /gate/trap1/geometry/setDx3   21. mm
> /gate/trap1/geometry/setDx4   21. mm
> /gate/trap1/geometry/setPhi   90. deg
> /gate/trap1/geometry/setAlp1  0. deg
> /gate/trap1/geometry/setAlp2  0. deg
> /gate/trap1/setMaterial  Air
> /gate/trap1/placement/setTranslation  0. 0. 0. mm
>
> When I change the "theta" parameter, the face at +pDz goes up or down in
> the Y direction.
>
> How can I make that same face move in the X direction (right or left)?
>
> I tried to modify the phi/Alp1/Alp2 parameters, but the visualization
> either stays the same or it gives me an error...
>
>
>
> Thank you in advance,
>
>     Debora Salvado
>
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>
>
>
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-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
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