Sphere - facet interaction

Thanks Bruno Chareyre, that solved my question.

Hi Bruno,
thanks, seems like exactly what I was asking about :-) How is handled
interaction of sphere and vertex (where there may also be contacts with
edges sharing that one vertex)?
cheers
Jan

2013/2/25 Bruno Chareyre <email address hidden>

> Question #222795 on Yade changed:
> https://answers.launchpad.net/yade/+question/222795
>
> Status: Open => Answered
>
> Bruno Chareyre proposed the following answer:
> If I understand your question, it is not possible without changes in the
> source code.
> It was also discussed here: https://bugs.launchpad.net/yade/+bug/850864
>
> We are progressing slowly toward a solution, since vertices and edges
> have been introduced by François Kneib recently (but without facets at
> the moment, the entities are used to define grids). If we finally extend
> this to triangulated surfaces, it will surely not use the current
> "Facet" class.
>
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Contacts with edge and vertices are mutually exclusive, it is one or the other depending on the projected sphere's center.
We have a paper under review which explains that in details. I can send you a draft version if you like, or you can also see the 2D version of it, which is very similar (*).

One contact can in fact slide on this edges+vertices structure and go across different states without loosing the history:
sphere-edge -> sphere-vertex -> sphere-edge -> etc.

It means that for this specific contact id1 or id2 are changing in time. Programatically, it is achieved by copying the data of an existing interaction into a newly created interaction. It needs to carefully track contacts between spheres and grid elements.

The same concepts of mutual exclusion and tracking over time should be applied to a network of facet+edge+vertices to solve the current problems with facets. It will also open up the possibility of dynamic surfaces(**) provided the implementation is robust.

What do you have in mind? Would you spend time on this?

(*) https://yade-dem.org/w/images/1/1b/Chareyre%26Villard2005_licensed.pdf
(**) https://www.youtube.com/watch?v=YW5IsINjCvw

Hi Bruno,
most likely I will need such approach also for facets (and it would be very
nice feature anyway), so probably I will spend some time on it :-) but not
imediatelly, I will let you know when I start (to prevent more people doing
the same job).
Thanks for the information
Jan

2013/2/25 Bruno Chareyre <email address hidden>

> Question #222795 on Yade changed:
> https://answers.launchpad.net/yade/+question/222795
>
> Bruno Chareyre posted a new comment:
> Contacts with edge and vertices are mutually exclusive, it is one or the
> other depending on the projected sphere's center.
> We have a paper under review which explains that in details. I can send
> you a draft version if you like, or you can also see the 2D version of it,
> which is very similar (*).
>
> One contact can in fact slide on this edges+vertices structure and go
> across different states without loosing the history:
> sphere-edge -> sphere-vertex -> sphere-edge -> etc.
>
> It means that for this specific contact id1 or id2 are changing in time.
> Programatically, it is achieved by copying the data of an existing
> interaction into a newly created interaction. It needs to carefully
> track contacts between spheres and grid elements.
>
> The same concepts of mutual exclusion and tracking over time should be
> applied to a network of facet+edge+vertices to solve the current
> problems with facets. It will also open up the possibility of dynamic
> surfaces(**) provided the implementation is robust.
>
> What do you have in mind? Would you spend time on this?
>
> (*) https://yade-dem.org/w/images/1/1b/Chareyre%26Villard2005_licensed.pdf
> (**) https://www.youtube.com/watch?v=YW5IsINjCvw
>
> --
> 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
>