yade-dev team mailing list archive

[Václav Šmilauer <eudoxos@xxxxxxxx>]

> Let eB be an active edge. If a sphere S is on fB near eB (and, so, eA)
> then S has real contact with only fB because eA is inactive . But if S
> is on fA near eA (and, so, eB) then S has real contact with fA AND with
> eB because eB is active!
> Thus, we will have a surface anisotropy in this case...
>    
This would not happen (as far as I understood the picture) for convex 
and planar surfaces, since the contact point with fA is projection of 
the sphere center along the normal. Oh, yes, there would be a problem if 
there is penetration of the sphere into the surface... Hm... OTOH if 
htere is information about mutual angle between adjacent facets on the 
edge, that could be used. The contact detection would actually try to 
see if there is contact with adjacent facet's plane, and if not, make 
the contact with the edge. It is getting complicated.

Thanks for the paper, I will have a look at that.

V.