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[Jan Stránský <question645973@xxxxxxxxxxxxxxxxxxxxx>]

Question #645973 on Yade changed:
https://answers.launchpad.net/yade/+question/645973

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> I am a newbie in yade

welcome :-)

please be more specific on "generate a cylinder".
If it means to extract particles within a cylindrical predicate, you can try:
#############
from yade import pack
pred = pack.inCylinder((0.5,0.5,0),(0.5,0.5,1),.4) #[1]
cyl = [b for b in O.bodies if isinstance(b.shape,Sphere) and pred(b.state.pos,b.shape.radius)]
# predicate(center,radius) returns True if it contains the sphere(center,radius), False otherwise

# test
sphs = [(b.state.pos,b.shape.radius) for b in cyl]
O.reset()
O.bodies.append([sphere(pos,r) for pos,r in sphs])
#############

if you need more help to understand the example (it is a bit compressed commands, could be rewritten to more understandable way), let us know
cheers
Jan

[1] https://yade-
dem.org/doc/yade.pack.html#yade._packPredicates.inCylinder

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