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[Question #678879]: 'No spheres are produced by regularHexa-function'


New question #678879 on Yade:

Hi there,

I am using Ubuntu 18.04.2  LTS and yade version 2018.02b.
Started yade for 1 week now. 

I was simply trying the example code below along with the 
'horse.coarse.gts' .

these are my commands:
In [1]: import gts
   ...: surf=gts.read(open('horse.coarse.gts'))

In [2]: pred=pack.inGtsSurface(surf)
   ...: aabb=pred.aabb()
   ...: radius=(aabb[1][0]-aabb[0][0])/40
   ...: O.bodies.append(pack.regularHexa(pred,radius=radius,gap=radius/4.))

[and this came as output]
/usr/lib/x86_64-linux-gnu/yade/py/yade/pack.py:359: RuntimeWarning: No spheres are produced by regularHexa-function
  warnings.warn('No spheres are produced by regularHexa-function',category=RuntimeWarning)

I have no sphere inside the Scene.
What I am doing wrong, you think?

The same problem I have experienced for example of 'horse.py' or 'get.horse.py' also. 
There was simply nothing/ no spheres inside the scene.

Any advice would be appreciated.



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