> Ok then I will update my law, I missed these introductions. Thanks!

You are very welcome. I added those functions yesterday actually, when I
added the homoDeform==1 (position update) and had tocheck what kind of
homoDeform we had at multiple places (ScGeom, NewtonIntegrator etc).

-- 
periodic boundary don't work with ViscEl classes
https://bugs.launchpad.net/bugs/666246
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developers, which is subscribed to Yade.

Status in Yet Another Dynamic Engine: Fix Committed

Bug description:
Periodic boundary don't work with Ig2_Facet_Sphere_ScGeom and 
Ig2_Sphere_Sphere_ScGeom functors.


#=============BEGIN SCRIPT TEST PERIODIC WITH Ig2_Sphere_Sphere_ScGeom==========
# -*- coding: utf-8

from yade import utils

sphereRadius=0.1
tc=0.001# collision time 
en=0.3  # normal restitution coefficient
es=0.3  # tangential restitution coefficient
density=2700
frictionAngle=radians(35)# 
params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))


# Spheres
sphId=O.bodies.append([
        utils.sphere( (i*0.2+0.1,0.5,0.2), 0.1, material=sphereMat) for i in 
range(5)
        ])
O.bodies[sphId[-1]].state.vel=(0.5,0.5,0)

## Engines 
O.engines=[
        ForceResetter(),
        InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
        InteractionLoop(
                [Ig2_Sphere_Sphere_ScGeom()],
                [Ip2_ViscElMat_ViscElMat_ViscElPhys()],
                [Law2_ScGeom_ViscElPhys_Basic()],
        ),
        NewtonIntegrator(damping=0),
]

O.periodic=True
O.cell.refSize=Vector3(1,1,1)

O.dt=.01*tc

O.saveTmp()
#==========================END======================


#=============BEGIN SCRIPT TEST PERIODIC WITH Ig2_Facet_Sphere_ScGeom==========
# -*- coding: utf-8

from yade import utils

sphereRadius=0.1
tc=0.001# collision time 
en=0.3  # normal restitution coefficient
es=0.3  # tangential restitution coefficient
density=2700
frictionAngle=radians(35)# 
params=utils.getViscoelasticFromSpheresInteraction(tc,en,es)
facetMat=O.materials.append(ViscElMat(frictionAngle=frictionAngle,**params)) 
sphereMat=O.materials.append(ViscElMat(density=density,frictionAngle=frictionAngle,**params))

floor
n=5.
s=1./n
for i in range(0,n):
        for j in range(0,n):
                O.bodies.append([
                        utils.facet( 
[(i*s,j*s,0.1),(i*s,(j+1)*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
                        utils.facet( 
[(i*s,j*s,0.1),((i+1)*s,j*s,0.1),((i+1)*s,(j+1)*s,0.1)],material=facetMat),
                ])

# Spheres
sphId=O.bodies.append([
        utils.sphere( (0.5,0.5,0.2), 0.1, material=sphereMat),
        ])
O.bodies[sphId[-1]].state.vel=(0.5,0,0)

## Engines 
O.engines=[
        ForceResetter(),
        InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
        InteractionLoop(
                [Ig2_Facet_Sphere_ScGeom()],
                [Ip2_ViscElMat_ViscElMat_ViscElPhys()],
                [Law2_ScGeom_ViscElPhys_Basic()],
        ),
        GravityEngine(gravity=[0,0,-9.81]),
        NewtonIntegrator(damping=0),
]

O.periodic=True
O.cell.refSize=Vector3(1,1,1)

O.dt=.01*tc

O.saveTmp()
#==========================END======================



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