gravity deposition of cylinderConnection

Hello everybody,

I am new in YADE and I am trying to have a depositions of cylinderConnections by adding each cylinderConnection one by one using PyRunner. Somehow the cylinderConnections lose the connection with the nodes and stop the evolution in time, but the nodes keep the evolution. *The CylinderConnections start elongating from the position they stopped.

This is the functions I am using

PyRunner(command = 'createRandomCylinder()', virtPeriod = 1.0, label = 'cylinders')

this is the function :

def createRandomCylinder():

 global nodesIds
 global cylIds
 global vertices

 Nc = 9 # number of fibers
 rFib = 0.2 # radious of the fiber
 Ne = 20 # nymber of nodes for the fiber
 dx = 0.0 # distance between two fibers X
 dy = 1.0 # distance between two fibers Y
 dz = 0.0 # distance between two fibers Z
 LFib = 8.0 # size of the fiber

 dzj = 2.0*Lz #Initial position Z
 dyj = 0.5*Ly #Initial position Y
 dxj = 0.5*Lx #Initial position X
 omegaY = 20.0 #Frequency Y
 omegaX = 20.0 #Frequency X
 phiY = 0.0 #Desfase Y
 phiX = 0.0 #Desfase X
 hY = 0.2 #Amplitud Y
 hX = 0.2 #Amplitud X

 nodesIdsAux = []
 cylIdsAux = []
 verticesAux = []

 for i in range(0, Ne+1):
  pz = float(i)*LFib/float(Ne)
  py = hY*sin(float(i)*omegaX + phiY)
  px = hX*sin(float(i)*omegaY + phiX)
    verticesAux.append([px + dxj,py + dyj, pz + dzj])
 nodesIds.append(nodesIdsAux)
 cylIds.append(cylIdsAux)
 vertices.append(verticesAux)
 cylinderConnection(vertices[-1],rFib,nodesIds[-1],cylIds[-1], wire=False, color=[1,0,0],highlight=False,intMaterial='cylindermat',extMaterial='fMat')

Thank you very much,

Antonio