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[Jan Stránský <question517125@xxxxxxxxxxxxxxxxxxxxx>]

Question #517125 on Yade changed:
https://answers.launchpad.net/yade/+question/517125

Jan Stránský proposed the following answer:
Hi Huihuang,
​randomDensePack returns list of spheres. To handle all the spheres, you
have to iterate over the list, see 1).
if you O.bodies.append with one particle, its ID is returned. If you append
more bodies, their IDs are returned as a list. Again, iteration is needed,
see 2)

1)
ball_id = O.bodies.append(...)
ball = O.bodies[ball_id]
for i in ball:
   b = O.bodies[i]
  b.state.... = ...

2)
cube=pack.randomDensePack(...)
O.bodies.append(cube)
for b in cube:
   b.state.blockDOFs='xyzXY'
   b.state.vel=(0,0,-0.1)

cheers
Jan

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