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Hello Steve,</div>
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As you found out, I do not think it is possible to apply a ring repeater on an already "ring repeated" volume. But <span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">I think you still have at least two options to achieve what
you want here.</span></div>
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1) If it does not bother you to define again the same SPECThead with a different name (e.g. SPECThead2), you could just apply another ring repeater to this new volume, by specifying the starting angle as 180 deg :</div>
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<span>/gate/SPECThead2/repeaters/insert ring<br>
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<div>/gate/SPECThead2/ring/setFirstAngle 180 deg # this line is important to achieve what you want!<br>
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<div>/gate/SPECThead2/ring/setAngularSpan 76 deg<br>
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<span>/gate/SPECThead2/ring/setRepeatNumber 2</span><br>
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<span>2) If you absolutely want to keep a single definition of your SPECThead, then you could have a look at the generic repeater, which could be a good option for you also since you only have to calculate the rotations and translations needed to position four
volumes on a circle : <a href="https://opengate.readthedocs.io/en/latest/defining_a_geometry.html?highlight=ring%20repeater#generic-repeater">https://opengate.readthedocs.io/en/latest/defining_a_geometry.html?highlight=ring%20repeater#generic-repeater</a>.</span></div>
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In the hope that this answer will help you,</div>
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Étienne</div>
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