Question #665350 on Yade changed:
Status: Answered => Solved
zhao dejin confirmed that the question is solved:
Thanks Chiara Modenese, that solved my question.
You received this question notification because your team yade-users is
an answer contact for Yade.
Mailing list: https://launchpad.net/~yade-users
Post to : email@example.com
Unsubscribe : https://launchpad.net/~yade-users
More help : https://help.launchpad.net/ListHelp