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Re: [Question #691277]: The movement of particles and their positions in Periodic cell

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question691277@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Jun 2020 08:11:06 -0000
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Question #691277 on Yade changed:
https://answers.launchpad.net/yade/+question/691277

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

particles are free to move arbitrarily, regardless dimension of the periodic cell.
Just for the contact detection phase (and Yade GUI display), the positions are **virtually** wrapped into the cell (+- one period).

If instead of true particle position you want the wrapped positions, use [1] and export O.cell.wrap(b.state.pos) instead of b.state.pos (or do it in the post-processing phase).
Both approaches (true and wrapped position) are reasonable and have their use cases.

cheers
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Cell.wrap

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