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[Chareyre <question177419@xxxxxxxxxxxxxxxxxxxxx>]

Question #177419 on Yade changed:
https://answers.launchpad.net/yade/+question/177419

    Status: Open => Answered

Chareyre proposed the following answer:
It is impossible in general. If you have a periodic patern like this:

     ____
   /  /  /
  ____
/  /  /

... and if you look at it through a rectangular window, then what you
see in the rectangle is not a periodic (by translating the rectangle
vertically, you see something different).

It is of course always possible to draw spheres in a rectangle, but it
doesn't show the real period. Maybe the papers you mention did that.

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