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[Jinny Kim <question688879@xxxxxxxxxxxxxxxxxxxxx>]

New question #688879 on Yade:
https://answers.launchpad.net/yade/+question/688879

Hi, there.

 I am trying to create three layers and see any particle movements for the second and top layers. For this, I need to let the bottom layer not be subject to any forces (just fixed). I am trying to use 'blockedDOFS = 'xyzXYZ', but I got an error like this: 

AttributeError: 'tuple' object has no attribute 'state'

Is there anyone who can resolve this error? I attach my simple code below!

import math
Density=3000
Young=3.3e7
poisson=0.3
c_r = 0.15
s_fc = 0.5
r_fc = 0.3
frictionAngle=math.atan(s_fc)
sphereColor = (.8,.8,0.)#dirty yellow
## Import particles
grains = FrictMat(young=Young,poisson=poisson,density=Density,frictionAngle=frictionAngle)
Mat=O.materials.append(grains)
#create assembly of spheres
from yade import pack
sp=pack.SpherePack()
sp.makeCloud(minCorner=(-0.25,-0.25,3.0e-3),maxCorner=(0.25,0.25,0.0),rMean=3.0e-3,rRelFuzz=0.,num=10000,periodic=False)
sp.toSimulation(material=Mat,color=sphereColor)
for b in sp:
    b.state.blockedDOFs = 'xyzXYZ'

## Engines
O.engines=[
    ForceResetter(),
    InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
    InteractionLoop(
        [Ig2_Sphere_Sphere_ScGeom(),Ig2_Facet_Sphere_ScGeom()],
        [Ip2_FrictMat_FrictMat_MindlinCapillaryPhys(krot=r_fc,en=c_r,es=c_r)],
        [Law2_ScGeom_MindlinPhys_Mindlin(includeMoment=True)]
        ),
    NewtonIntegrator(damping=0,gravity=(0,0,-9.81)),
]
## time step
O.dt=1.0e-5
## GUI
from yade import qt
qt.View()

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