Yade

Excluding periodic interactions on half of cell faces

Asked by Jan Stránský

Hello,

I am wondering, if it is possible to exclude periodic interactions on negative faces of periodic cell (those with outer normal against coordinate axes) while preserving periodic contacts on positive faces.

Dividing the cell into 3 parts in each directions and using bitmasks could be one solution, but I would like not to use this one. I want to use it in a very special case where I use a lot of masks for a lot of periodic cells using actually one periodic cell. So, introducing 6 bits for each one, I would run out of int width.

Thanks
Jan

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Bruno Chareyre
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Bruno Chareyre (bruno-chareyre) said : 		#1

I don't get it. If (id1,id2) is on a negative face, then (id2,id1) is on a positive face, isn't it?!

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Jan Stránský (honzik) said : 		#2

Hi Bruno,

> I don't get it. If (id1,id2) is on a negative face, then (id2,id1) is on
> a positive face, isn't it?!
>
>
exactly :-) so my problem is to make the scene "semi-periodic", to apply
force only on one of the two bodies.. probably not easy task.. I will
introduce optional wider groupMask if necessary, it would solve my problem
and would be the easiest way.

Thanks
Jan

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Best Bruno Chareyre (bruno-chareyre) said : 		#3

Wow, the most crazy idea I've heard recently. I fail to understand the logic, but I guess you have a reason. :)
Checking i->cellDist[k] >0 comes to mind. Obviously it needs changes in the source code.

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Jan Stránský (honzik) said : 		#4

Hi Bruno,
yes, it is very crazy idea indeed :-) If I touch the source code, it would
be the optional using different type for Body::groupMask to be able to
gather more bitmask values.
Thanks for the clarification
Jan

2014-05-26 14:51 GMT+02:00 Bruno Chareyre <
<email address hidden>>:

> Your question #249287 on Yade changed:
> https://answers.launchpad.net/yade/+question/249287
>
> Status: Open => Answered
>
> Bruno Chareyre proposed the following answer:
> Wow, the most crazy idea I've heard recently. I fail to understand the
> logic, but I guess you have a reason. :)
> Checking i->cellDist[k] >0 comes to mind. Obviously it needs changes in
> the source code.
>
> --
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Jan Stránský (honzik) said : 		#5

Thanks Bruno Chareyre, that solved my question.