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[Question #269383]: TesselationWrapper computes zero volume

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Alexander <question269383@xxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 18 Jul 2015 13:46:29 -0000
Reply-to: question269383@xxxxxxxxxxxxxxxxxxxxx
Sender: bounces@xxxxxxxxxxxxx

New question #269383 on Yade:
https://answers.launchpad.net/yade/+question/269383

Hellow everybody.

I try to use TesselationWrapper() to evaluate the volume of Voronoi cell for each sphere but for some of them TesselationWrapper() gives zero volume (in particular id =[0,1,2,3,4,5])

Yade version: 2015-03-17.git-16ecad0

////

MWE: 

spheres = pack.regularOrtho(pack.inAlignedBox((0,0,0),(4.1,4.1,4.1)),0.5,0)
O.bodies.append(spheres)

TW=TesselationWrapper()
TW.triangulate()
TW.computeVolumes()

for b in O.bodies:
   print 'particle volume ', TW.volume(b.id)

/// Result:

particle volume  0.0
particle volume  0.0
particle volume  0.0
particle volume  0.0
particle volume  0.0
particle volume  0.0
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00006250173
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00016877158
particle volume  1.00006249527
particle volume  1.00006250173
particle volume  1.00016879095
particle volume  1.00006248882
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00000624992
particle volume  1.0
particle volume  1.0
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.0
particle volume  1.0
particle volume  1.00000624992
particle volume  1.00006250173
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00006248882
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00000624992
particle volume  1.0
particle volume  1.0
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.0
particle volume  1.0
particle volume  1.00000624992
particle volume  1.00006250173
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.0001687845
particle volume  1.00006249527
particle volume  1.00006250173
particle volume  1.0001687845
particle volume  1.00006250173
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006249527
particle volume  1.00006250173
particle volume  1.00000624992
particle volume  1.00000624992
particle volume  1.00006248882
particle volume  1.00016877804
particle volume  1.00006248882
particle volume  1.00006248882
particle volume  1.00016880387

So any ideas

with regards, Alexander


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