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[Jan Stránský <question681246@xxxxxxxxxxxxxxxxxxxxx>]

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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