Question #681246 on Yade changed:
https://answers.launchpad.net/yade/+question/681246
Status: Open => Answered
Jan Stránský proposed the following answer:
Hello,
> question1
for non-periodic simulations, it is Vector3(0,0,0)
for periodic simulations, is is shift of the second body to make the
interaction meaningful
> question2
se31.position would be in python state.pos
**usually** it is the center of mass. But in general b.state.pos and b.shape.v
can be quite independent.
cheers
Jan
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