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["Sergei D." <sj2001@xxxxxxxxx>]

> Hi, could you state more question more clearly: what is your model, what
> functors you use etc -- or post the script?
>
> If you have your own Ig2 functors, you need to take in account the
> shift2 parameter (by which the id2 must be shifted), and then make sure
> you apply right force in the contact law.

My script. Will work with r2508.

--
Best regards,
Sergei D.

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

## Engines 
O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(), 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()