yade-users team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

2010/4/19 Václav Šmilauer <eudoxos@xxxxxxxx>

>
> > I would like to understand well the design you assigned to the
> > collider. It is almost clear as you describe it in your documentation,
> > just one more confirmation. If one does not include in the contact law
> > to request the erase of the interaction for a certain condition, the
> > interaction being real will always remain such. Is this right?
> Yes. The collider is supposed to handle collisions (by creating/deleting
> potential interactions). It is none of its business to operate on real
> interactions.
> > Is this design thought to facilitate the implementation of cohesive
> > laws?
> That was the original motivation. More generally, what law does is
> completely orthogonal to what collider does. (One works only on
> potential and the other one only on real interactions).
>
Ok, thanks for explanation.

>  In my mind I was thinking I would assign to the collider the care of
> > maintaining real an interaction or not. For laws that need
> > adhesion/cohesion in the normal/shear direction we can still play in
> > the contact law having enlarged bounding boxes. Would not be the same?
> It used to be that way, and it doesn't work well. You need to have match
> between collider and your contact law, otherwise it breaks down.
>
I see.

>
> Enlarging all bounding boxes creates more potential interactions and
> incurs (possibly severe) performance penalty. You have to adjust bbox
> size to longest possible interaction.
>
That is right, but so far it is the only way to create distant
interactions..

>
> If you feel like writing your own collider, that will only work with
> your contact law, I would only say that it doesn't fit the way it is
> currently done (which works reasonably well I think) and that it heads
> towards the trend of everybody having his/her own half-assed classes.
>
You are right, it was not my intention (sorry it was just my guessing, it
does already have a good design).


>
> What would be your motivation of not deleting contact in the contact
> law?
>
> v
>
>
> _______________________________________________
> Mailing list: https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users>
> Post to     : yade-users@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~yade-users<https://launchpad.net/%7Eyade-users>
> More help   : https://help.launchpad.net/ListHelp
>