How to export and import a irregular shape particles model.

Hi all,

I am a new user of yade. I tried polyhedra particles falling down into a box. I am wondering how can I export this model after it finishes this falling process and how to import it and down the next simulation? For example, generate a beam on this aggregates.

I used this code and yade.export.textPolyhedra. I don't know whether it is right or not.

######################################################################
# INPUTS
######################################################################
gravity = 100

# box dimensions
widthl = .3
widthr = .3
widthc = .3
height = .3
thick = .5
deep = -.2

# size of grains
sizeMin = 40e-3
sizeMax = 60e-3

frictionAngle = .5
young = 1e8 # stiffness

dt = 1e-3 # time step

nGravityDeposition = 250 # how long to run initial gravity deposition
nCycles = 3 # how many jumps to run afterwards
nStepsBetweenCycles = 200 # number of time steps between jumps
dspl = 20e-3

# how much larger the initial make box should be
fillBoxHFactor = 3
######################################################################
from yade import polyhedra_utils, export

width = widthl+widthc+widthr

# mat, engines, ...
mat = PolyhedraMat(young=young,poisson=10,frictionAngle=frictionAngle)
O.materials.append(mat)
O.engines=[
   ForceResetter(),
   InsertionSortCollider([Bo1_Polyhedra_Aabb(),Bo1_Facet_Aabb()]),
   InteractionLoop(
      [Ig2_Polyhedra_Polyhedra_PolyhedraGeom(), Ig2_Facet_Polyhedra_PolyhedraGeom()],
      [Ip2_PolyhedraMat_PolyhedraMat_PolyhedraPhys()],
      [Law2_PolyhedraGeom_PolyhedraPhys_Volumetric()],
   ),
   NewtonIntegrator(damping=0.4,gravity=(0,0,-gravity)),
 PyRunner(iterPeriod=1,command='checker()'),
]
O.dt = dt
def checker():
 for i in range(nCycles):
  ii = nGravityDeposition+i*nStepsBetweenCycles
  if O.iter == ii:
   moveBottom()
  if O.iter == ii+1:
   stopBottom()
 if O.iter == nGravityDeposition+nCycles*nStepsBetweenCycles:
  O.pause()
def moveBottom():
 v = dspl / O.dt
 for b in movables:
  b.state.vel = (0,0,-v)
def stopBottom():
 for b in movables:
  b.state.vel = (0,0,0)

# box
p000 = Vector3(0,0,0)
p100 = Vector3(widthl,0,0)
p200 = Vector3(widthl+widthc,0,0)
p300 = Vector3(widthl+widthc+widthr,0,0)
pxs = (p000,p100,p200,p300)
p001,p101,p201,p301 = [p+Vector3(0,0,height) for p in pxs]
p010,p110,p210,p310 = [p+Vector3(0,thick,0) for p in pxs]
p011,p111,p211,p311 = [p+Vector3(0,thick,height) for p in pxs]
p00b,p10b,p20b,p30b = [p+Vector3(0,0,deep) for p in pxs]
p01b,p11b,p21b,p31b = [p+Vector3(0,thick,deep) for p in pxs]
def rect(vs,**kw):
 v1,v2,v3,v4 = vs
 return [
  facet((v1,v2,v3),**kw),
  facet((v1,v3,v4),**kw),
 ]
movables = rect((p100,p200,p210,p110)) # bottom center
rects = (
 (p000,p100,p110,p010), # bottom left
 (p200,p300,p310,p210), # bottom left
 (p000,p010,p011,p001), # left
 (p300,p310,p311,p301), # right
 (p000,p100,p101,p001), # front left
 (p100,p200,p201,p101), # front center
 (p200,p300,p301,p201), # front right
 (p010,p110,p111,p011), # back left
 (p110,p210,p211,p111), # back center
 (p210,p310,p311,p211), # back right
 (p100,p200,p20b,p10b), # front center below
 (p110,p210,p21b,p11b), # back center below
 (p100,p110,p11b,p10b), # left below
 (p200,p210,p21b,p20b), # right below
)
rects = movables + sum((rect(r) for r in rects),[])
O.bodies.append(rects)

# gravel
polyhedra_utils.fillBox((0,0,0),(width,thick,fillBoxHFactor*height),mat,sizemin=3*[sizeMin],sizemax=3*[sizeMax],seed=1)

yade.export.textPolyhedra('try2.txt', comment='try2', mask=-1, explanationComment=True, attrs=[])

####################
Thanks.