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Re: [Question #683065]: the direction of O.interactions.geom.normal

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question683065@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Aug 2019 21:12:41 -0000
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Question #683065 on Yade changed:
https://answers.launchpad.net/yade/+question/683065

Jan Stránský posted a new comment:
> is there any rule or order between O.interactions[0,1].id1 and
O.interactions[0,1].id2?

interactions are created:
- "manually" with createInteraction function. Then the order is defined by the order of createInteraction arguments
- "automatically" by the collider. Then the order is ruled by the collider (the no trivial dependency I referred in #1).

So let's say that from user's point of view, the order is "random", "upredictable" or some word like this.
But note that through id1 and id2 you have access to the bodies and their positions, so you can treat some directions as negated e.g. to have all directions pointing in x+ direction.

cheers
Jan

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