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[Jérôme Duriez <question255937@xxxxxxxxxxxxxxxxxxxxx>]

Question #255937 on Yade changed:
https://answers.launchpad.net/yade/+question/255937

Jérôme Duriez proposed the following answer:
Hi,

About 2, unfortunately Murphy's law says that you usually do not get
what you expect until you fully understand your script.. So, try to
achieve this goal, we're here to try to answer - precise, ideally ;-) -
questions !

For example, triax.goal1/2/3 is generally a python variable reflecting
the corresponding attribute of a TriaxialStressController (or similar)
engine used in a simulation, see [1] . This engine being labelled
'triax', see [2] and examples if you do not know what a label is in
Yade.

Here, in the 2d version of your script, you define indeed (directly, not
by label) such an Engine as 'triax', but you do not use it in your
simulation. (Because it is not in the O.engines list definition)


[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.TriaxialStressController.goal1  You will need to understand also stressMask variable to fully understand goal variable. If the corresponding doc is not enough, give a look to Bruno's link in answer #4, few lines above l.94)
[2] https://yade-dem.org/doc/user.html#labeling-things

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