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[Bruno Chareyre <question652968@xxxxxxxxxxxxxxxxxxxxx>]

Question #652968 on Yade changed:
https://answers.launchpad.net/yade/+question/652968

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
1- Is your question "how can I calculate porosity?". I would think it is trivial if the volume is defined by facets (you can use their positions).
2- There is no problem in changing parameters of O.materials. You'll need to make sure existing interactions are updated though (possibly looping over them to update some values).

Your copy-paste failed somehow, so I'm unable to read your script
without line-breaks. I would suggest pasting it in the launchpad
interface (I guess you sent by email?).

I must say I would be more inclined to help someone trying to avoid export/import of positions, because it will cause a number of superfluous problems later. 
Positions alone do not define a mechanical state. Most of the information is lost in the pipe.

Bruno

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