New question #689910 on Yade:
https://answers.launchpad.net/yade/+question/689910

Now I am creating a box that contains particles and in the box there are two 
box other box overlapping each other. So I  compaction the particle til it 
should have maximum density . After that I use the order that remove the box on 
top so that I can use only the particles that contain in the box below.

Like the linked here : 
https://drive.google.com/file/d/1NJS5aNrSW_rJr_QfPmBXiCBpa6gjfhRj/view?fbclid=IwAR0T39TBoc9dr6izEWT1KW4DXGgrfARtabsu_h3gpQx4BQVm2DCN_XTjIBs

After that  I want to save the particles or sphere in the box below that are 
left by using an order export.text() to save the particles. But there was a 
problem in the order that it save the particles that contain in both boxes but 
I only want to save the particles that contain in the box below. Do you have a 
suggestion how to save only the particles that contain in the box below ?

this is my code : 
from yade import pack,ymport
import matplotlib.pyplot as plt
import math

O.materials.append(FrictMat(young=20e10,density=7860,label="steel"))

O.materials.append(FrictMat(young=20e6,poisson=0.3,frictionAngle=radians(30),density=1800,label='spheres'))

# create rectangular box from boxes (maybe there is some library function, but 
I did not find it quickly)
cx,cy,cz = 6.3,6.3,6.3 # center of the box
dx,dy,dz = 7.5,7.5,7.5 # half-dimensions of the box
t = 0.25 # half-thickness of walls
left = 
box((cx-dx-t+1.2,cy+1.2,cz),(t,dy+2*t,cz),fixed=True,wire=True,material="steel")
right = 
box((cx+dx+t+1.2,cy+1.2,cz),(t,dy+2*t,cz),fixed=True,wire=True,material="steel")
front = 
box((cx+1.2,cy-dy-t+1.2,cz),(dx,t,cz),fixed=True,wire=True,material="steel")
back = 
box((cx+1.2,cy+dy+t+1.2,cz),(dx,t,cz),fixed=True,wire=True,material="steel")
bottom = 
box((cx+1.2,cy+1.2,cz-dz-t+1.2),(dx+2*t,dy+2*t,t),fixed=True,wire=True,material="steel")

left2 = 
box((cx-dx-t+1.2,cy+1.2,cz*2+2.7),(t,dy+2*t,2.7),fixed=True,wire=True,material="steel")
right2 = 
box((cx+dx+t+1.2,cy+1.2,cz*2+2.7),(t,dy+2*t,2.7),fixed=True,wire=True,material="steel")
front2 = 
box((cx+1.2,cy-dy-t+1.2,cz*2+2.7),(dx,t,2.7),fixed=True,wire=True,material="steel")
back2 = 
box((cx+1.2,cy+dy+t+1.2,cz*2+2.7),(dx,t,2.7),fixed=True,wire=True,material="steel")


top2 = box((cx+1.2,cy+1.2,18+t),(dx,dy,t),fixed=True)
Boxids=O.bodies.append((left,right,back,front,left2,right2,back2,front2,bottom))

O.bodies.append(ymport.text('minmin'))

O.engines=[
 ForceResetter(),
 InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
 InteractionLoop( 
  [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
  [Ip2_FrictMat_FrictMat_FrictPhys()],
  [Law2_ScGeom_FrictPhys_CundallStrack()]
 ),
 NewtonIntegrator(gravity=(0,0,-9.81),damping=0.4),
 TranslationEngine(translationAxis=[0,1,0],velocity=5.0,ids=Boxids[4:8]),
 PyRunner(command='check()',iterPeriod=1000,label='checker')
]

O.dt=PWaveTimeStep()

def check() :
        if O.bodies[7].state.pos[1]>20:
                O.pause()
                bb=[]
                for b in O.bodies:
                        if isinstance(b.shape,Sphere):
                                if b.state.pos[0]>=0 and b.state.pos[0]<=15:
                                        if b.state.pos[1]>=0 and 
b.state.pos[1]<=15:
                                                if b.state.pos[2]>=0 and 
b.state.pos[2]<=12.6:
                                                        bb.append(b)
                nb=len(bb)
                vs=nb*(4.0/3)*pi*(0.2**3)
                ms=1800*1e-6*vs
                V=15*15*12.6*1e-6
                Densitymin=ms/V
                unitweightmin=(ms*9.81)/V
                print('Densitymin =', Densitymin)                       
                print('Unitweightmin =', unitweightmin)
                print('Volume of soil =', vs)
                print('Mass of soil =', ms)
                print('Volume of specimen',V)
                print('Number of sphere in specimen', nb)

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