Question #622864 on Yade changed:
https://answers.launchpad.net/yade/+question/622864

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hello,

1) Yes, this is correct (the order as well), see source code [1] to be sure. 
As a personal remark, note that such recording engines are probably less useful 
in YADE now that such kind of data can be easily accessed and saved through 
Python [2]. 
(Obviously, you may still use them though, if you're OK to spend time to know 
how these engines work)

3) The ForceRecorder is able to deal with several YADE bodies through its ids 
attribute [3], see also source code [1] to check that a cumulative value is 
stored.
Provided you know which (and how many) YADE bodies are created when you import 
this "mesh file", and that you correctly define this ids attribute, you should 
be able to do everything you want here.

Jerome

PS: I would recommend you open different Launchpad questions when you
have different questions, 2) being here quite distinct from 1)/3)

[1] 
https://github.com/yade/trunk/blob/e4e757f2e98a620e3177b7a36a1d10f69f6a6a28/pkg/dem/ForceTorqueRecorder.cpp#L14
[2] https://yade-dem.org/doc/tutorial-data-mining.html
[3] 
https://yade-dem.org/doc/yade.wrapper.html?highlight=forcerecorder#yade.wrapper.ForceRecorder.ids

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