|Message: Simple questions regarding GDML: Subvolumes?||Not Logged In (login)|
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I am right now studying in Medical Physics and quite new to Geant4 and GDML. We are right now creating a GDML-File representing a medical C-Arm-System, where I am having problems with the following idea:
The setup, that I have created in GDML, is right now very flexible in order to realize different investigation setups such as different rotations of the C-Arm along two different axes. Therefore I defined a sub-volume (right now I am using the normal <volume>-command) that is then being added to a higher order volume with a certain rotation in order to simulate the rotation of the C-Arm. This is done twice as I am defining two rotation axes, like
define VolumeRotX ...
define VolumeRotZ --> add VolumeRotX with Angle Phi ...
define MainVolume --> add VolumeRotZ with Angle Theta ...
Unfortunately, I always have to define a world volume for each (sub)volume, which leads to multiple world volumes in the overall setup. A found something like an "assembly"-volume, that does not need the definition of a world volume, but I was not able to implement it correctly, and I am not even sure if this is what I was looking for.
I hope, someone knows how to deal with that problem...
Thanks in advance, and have a nice weekend! Mathias
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