[Gate-users] generic trapezoid volume (pinhole)

[Débora Salvado]

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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