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## [Question #678816]: particle get through the facet

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```New question #678816 on Yade:
https://answers.launchpad.net/yade/+question/678816

hello
i have created a box by yade.utils.facet, but the particle always get through the boundary consist of facet and only a part of particle collision with the facet. i thought it maybe bacouse i set the value of timestep is too high, so i change it to a more low value, but it did not work. what confused me is that when i change the boundary to wall, everything is just fine. here is my code:

from yade import polyhedra_utils,pack,plot,utils
import random

m = PolyhedraMat()
m.density = 2600  # kg/m^3
m.young = 1E6  # Pa
m.poisson = 20000 / 1E6
m.frictionAngle = 0.6  # rad\

v1=((0,0,0),(0,0,10),(20,0,10))
v2=((0,0,0),(20,0,0),(20,0,10))
v3=((20,0,0),(20,10,10),(20,10,0))
v4=((20,0,0),(20,10,10),(20,0,10))
v5=((20,10,0),(0,10,10),(20,10,10))
v6=((20,10,0),(0,10,10),(0,10,0))
v7=((0,0,0),(0,10,10),(0,0,10))
v8=((0,0,0),(0,10,10),(0,10,0))
v9=((0,0,0),(20,10,0),(0,10,0))
v10=((0,0,0),(20,10,0),(20,0,0))

O.bodies.append(utils.facet(v1,material=m))
O.bodies.append(utils.facet(v2,material=m))
O.bodies.append(utils.facet(v3,material=m))
O.bodies.append(utils.facet(v4,material=m))
O.bodies.append(utils.facet(v5,material=m))
O.bodies.append(utils.facet(v6,material=m))
O.bodies.append(utils.facet(v7,material=m))
O.bodies.append(utils.facet(v8,material=m))
O.bodies.append(utils.facet(v9,material=m))
O.bodies.append(utils.facet(v10,material=m))

O.bodies.append(utils.wall(10, axis=0, sense=1, material=m))

O.bodies.append(utils.wall(-2, axis=2, sense=1, material=m))
polyhedra_utils.fillBox((0,0,0),(10,10,40),m,seed=1)

O.engines = [
ForceResetter(),
InsertionSortCollider([Bo1_Polyhedra_Aabb(), Bo1_Wall_Aabb(), Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Wall_Polyhedra_PolyhedraGeom(), Ig2_Polyhedra_Polyhedra_PolyhedraGeom(),
Ig2_Facet_Polyhedra_PolyhedraGeom()],
[Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()],  # collision "physics"
[Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()]  # contact law -- apply forces
),
# GravityEngine(gravity=(0,0,-9.81)),
NewtonIntegrator(damping=0.5, gravity=(0, 0, -9.81)),
PyRunner(command='checkUnbalanced()', realPeriod=3, label='checker')
]
O.dt=1e-2

# enable energy tracking; any simulation parts supporting it
# can create and update arbitrary energy types, which can be
# accessed as O.energy['energyName'] subsequently
O.trackEnergy=True
# if the unbalanced forces goes below .05, the packing
# is considered stabilized, therefore we stop collected
# data history and stop
def checkUnbalanced():
if unbalancedForce()<.05:
O.pause()
O.bodies.erase(1)
O.run()
#plot.saveDataTxt('bbb.txt.bz2')
# plot.saveGnuplot('bbb') is also possible

# collect history of data which will be plotted
def addPlotData():
# each item is given a names, by which it can be the unsed in plot.plots
# the **O.energy converts dictionary-like O.energy to plot.addData arguments
plot.addData(i=O.iter,unbalanced=unbalancedForce(),**O.energy)

# define how to plot data: 'i' (step number) on the x-axis, unbalanced force
# on the left y-axis, all energies on the right y-axis
# (O.energy.keys is function which will be called to get all defined energies)
# None separates left and right y-axis
plot.plots={'i':('unbalanced',None,O.energy.keys)}

# show the plot on the screen, and update while the simulation runs
plot.plot()

O.saveTmp()

i would appreciate if you can help me

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