Probable mistake: Data update using function updateElements in yade.utils

Hello,

The class UnstructuredGrid was implemented by me some 2 years ago as an
experimental version. The behavior you described was used on purpose, as it
was very simple and worked at that time (at least if I remember correctly).

I will have a look on the code and let you know if/what I will modify it.

cheers
Jan

2015-06-05 2:38 GMT+02:00 MikeZhao <email address hidden>:

> New question #267761 on Yade:
> https://answers.launchpad.net/yade/+question/267761
>
> I am working on renewing coordinates of Facet using function
> :setPositionsOfNodes and updateElements in yade.utils module and I have
> found out that there's something wrong with these functions.
>
> The position of Facet is illustrated with a reference position and a local
> coordinate, as is defined in the yade.utils module. The reference position
> is the inscribed Circle Center of the global coordinates of the vertices of
> the facet. But the position update process provided by the function
> updateElements simply changes the reference position of a facet to [0,0,0]
> and changes the coordinates to the recent coordinates, using global system
> instead of local system.
>
> If positions are updated this way, it can not be detected in contact
> searching process.
>
>
>
>
>
>
>
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Eh......I am a freshman to Yade, so I am not quite clear. I can describe what I have encountered:

I have tried to use some new positions of vertices to update locations of facet, but after updating by using function updateElements, there will be not forces on the facets. And I tried to make some change: If I set the facet.state.pos to the inscribed Circle Center of the global coordinates of the vertices of facet and set facet.shape.vertice to the local position(global - inscribed Circle Center), there will be forces on the facet.

But making this change will cause some problem about the memory: Usage of memory will keep growing if I try to use function updateElements repeatedly by using 'for i in range(1000)'...

Hope to get some solution,

thanks.

Hi Mike,

it was indeed a bug, thanks for reporting. It works for special cases and I
only tested those special ones..
It should be fixed in the latest git version

The memory issues should be fixed by using Facet.setVertices method

cheers
Jan

2015-06-05 18:41 GMT+02:00 MikeZhao <email address hidden>:

> Question #267761 on Yade changed:
> https://answers.launchpad.net/yade/+question/267761
>
> Status: Answered => Open
>
> MikeZhao is still having a problem:
> Eh......I am a freshman to Yade, so I am not quite clear. I can describe
> what I have encountered:
>
> I have tried to use some new positions of vertices to update locations
> of facet, but after updating by using function updateElements, there
> will be not forces on the facets. And I tried to make some change: If I
> set the facet.state.pos to the inscribed Circle Center of the global
> coordinates of the vertices of facet and set facet.shape.vertice to the
> local position(global - inscribed Circle Center), there will be forces
> on the facet.
>
> But making this change will cause some problem about the memory: Usage
> of memory will keep growing if I try to use function updateElements
> repeatedly by using 'for i in range(1000)'...
>
> Hope to get some solution,
>
> thanks.
>
> --
> You received this question notification because you are a member of
> yade-users, which is an answer contact for Yade.
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users
> Post to : <email address hidden>
> Unsubscribe : https://launchpad.net/~yade-users
> More help : https://help.launchpad.net/ListHelp
>