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[Meng Qing Xiang <question667121@xxxxxxxxxxxxxxxxxxxxx>]

New question #667121 on Yade:
https://answers.launchpad.net/yade/+question/667121

Hi everyone!

I'm trying to model concrete with clumps . I make a very simple test for creating clumps with existing spheres but it does not work.  I get the error "IndexError: Body already has id 0 set; appending such body (for the second time) is not allowed.". The script is as follows:

from yade import pack,export,qt,ymport
#define material for all bodies:
id_Mat=O.materials.append(FrictMat(young=1e6,poisson=0.3,density=1000,frictionAngle=1))
Mat=O.materials[id_Mat]
O.bodies.append(sphere([0,0,0], material=Mat, radius=0.5))
O.bodies.append(sphere([1,0,0], material=Mat, radius=0.5))
O.bodies.append(sphere([0,1,0], material=Mat, radius=0.5))
O.bodies.append(sphere([1,1,0], material=Mat, radius=0.5))
listOfClumpMembers = []
for b in O.bodies:
  tpos=b.state.pos
  if tpos[0]<0.1:
    listOfClumpMembers.append(b)

O.bodies.appendClumped(listOfClumpMembers)

I have checked the related answers but I still cannot solve this problem. 
Thanks in advance!!

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