[Gate-users] Drilling a Hole on the Phantom

[Xinjie Cao]

Dear all,

I used to implement the hole drilling on a phantom as followed,
```
/gate/world/daughters/name phantom1
/gate/world/daughters/insert cylinder
/gate/phantom1/placement/setTranslation           0.0 0.0 0.0 mm
/gate/phantom1/geometry/setRmax                   100. mm
/gate/phantom1/geometry/setHeight                 500 mm
/gate/phantom1/setMaterial                              Polyethylene
#/gate/phantom/vis/forceWireframe
#/gate/phantom/vis/setColor green
/gate/phantom1/attachPhantomSD

/gate/world/daughters/name phantom2
/gate/world/daughters/insert cylinder
/gate/phantom2/placement/setTranslation           0.0 -25.0 0.0 mm
/gate/phantom2/geometry/setRmax                   3.0 mm
/gate/phantom2/geometry/setHeight                 500 mm
/gate/phantom2/setMaterial                               Air
#/gate/phantom/vis/forceWireframe
#/gate/phantom/vis/setColor green
/gate/phantom2/attachPhantomSD
```
But I have been always thinking whether the air phantom I insert works as
the drilled hole? Or does it work as a cylinder mixed with polyethylene and
air?
Another way to say is whether a new phantom placed within the other phantom
volume will take the place of the original material or mix with it?
Any answer would be highly appreciated! Thanks!

Best,
Xinjie
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