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[Jan Stránský <question685862@xxxxxxxxxxxxxxxxxxxxx>]

Question #685862 on Yade changed:
https://answers.launchpad.net/yade/+question/685862

Jan Stránský proposed the following answer:
> Can I do this with aabbDim()?

no, aabbDim computes aabb (axis aligned bounding box) dimensions of the
sample (roughly the "maximum dimensions along axes").

To choose particles within a "ring" defined by radii r1 and r2, do:
###  (not tested)
halfwayParticles = []
for b in O.bodies:
   x,y,z = b.state.pos # maybe b.state.refPos
   d = sqrt(pow(x,2)+pow(y,2)) # assuming z axis
   if d > r1 and d < r2:
      halfwayParticles.append(b)
###

cheers
Jan

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