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[Huihuang Xia <question403219@xxxxxxxxxxxxxxxxxxxxx>]

Question #403219 on Yade changed:
https://answers.launchpad.net/yade/+question/403219

Description changed to:
Hi,
When I conduct simulation using randomDensePack in YADE(vision 1.20.0), a strange error occur as follows:
Welcome to Yade 1.20.0 
TCP python prompt on localhost:9000, auth cookie `caseus'
XMLRPC info provider on http://localhost:21000
[[ ^L clears screen, ^U kills line. F12 controller, F11 3d view (use h-key for showing help), F10 both, F9 generator, F8 plot. ]]

Yade [1]: from yade import pack

Yade [2]: ## construct the predicate first

Yade [3]:
pred=pack.inHyperboloid(centerBottom=(0,0,-.1),centerTop=(0,0,.1),radius=.05,skirt=.03)

Yade [4]: ## alternatively:
pack.inHyperboloid((0,0,-.1),(0,0,.1),.05,.03)

Yade [5]: ## pack the predicate with spheres (will be explained later)

Yade [6]: spheres=pack.randomDensePack(pred,spheresInCell=2000,radius=3.5e-3)
No suitable packing in database found, running PERIODIC compression
/usr/lib/x86_64-linux-gnu/yade/py/yade/pack.py:296: FutureWarning: The default behavior will change; specify returnSpherePack=True for the new behavior, and False to get rid of this warning (your code will break in the future, however). The returned SpherePack object can be added to the simulation using SpherePack.toSimulation()
  warnings.warn('The default behavior will change; specify returnSpherePack=True for the new behavior, and False to get rid of this warning (your code will break in the future, however). The returned SpherePack object can be added to the simulation using SpherePack.toSimulation()',category=FutureWarning)

Yade [7]: ## add spheres to simulation

Yade [8]: O.bodies.append(spheres)
 ->  [8]: 
[0,
 1,
 2,
 3,
 4,
 5,
Finally, Yade got a same results as in the tutorial, but when I using randomDensePack to conduct other simulation, it got only this error (No suitable packing in database found, running PERIODIC compression...) without any particles displayed in the 3D view.
Can you help me to solve this problem?
Many thanks.

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