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[Alvin <question180889@xxxxxxxxxxxxxxxxxxxxx>]

Question #180889 on Yade changed:
https://answers.launchpad.net/yade/+question/180889

Alvin posted a new comment:

O.bodies.append(utils.geom.facetBox( center=(5,5,5), extents=(2.0,2.0,2.0) ,fixed=False,wire=False,wallMask=31,material=-1))

and 
O.bodies[-1].mass=20000
O.bodies[-2].mass=20000
 ....
 to assign mass to them

and an error occured like  " bodies 2230 has a velocity==NaN! "  the
body 2230 was part of the facetbox

but instead of creating a  Box, no such error

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