yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Suppose sphere and facet in contact, where the facet rotates along axis
> parallel to the contact normal, so that the contact circumscribes a
> circle around the facet's rotation center -- will that work?
>    
Yes, of course. Why not?
> > So, I revert and resume working with ScGeom as usual?
> >      
> Yes, please -- unless you finally say what is the benefit of that
> change.
>
>    
There must have been a misunderstanding at a point. I thought merging 
ScGeom and Dem3Dof was clearly an objective for all of us. Anton asked 
for that once again a few days ago. We discussed that in many mails, and 
for hours in Prague. That is why I didn't elaborate the reason for 
merging nor discussed it in mails before commit, I thought the point was 
clear.  I also saw that GenericSphereContact was planned for removal at 
a point : how would it be removed without merging classes?

Do you remember this discussion on precomputing different things in a 
unique geometry class, based on flag saying if the functors are 
incremental or total? You said it would be like emulating inheritance, 
very true, so I thought using inheritance was smarter than emulating it.
In my vision, ScGeom would precompute displacement for incremental laws 
in contact point paradigm, while Dem3Dof would precompute total strains 
in continuum-discrete paradigm (not fully consistent, since we have in 
fact 4 possible combinations with point/continuum vs. incremental/total, 
but only two combinations are in Yade atm).

Actually, I will not try to proove a real need for merging. I did it 
only because I felt it was high in the list of TODOs and I was the 
assignee (like e.g., don't ask me to explain why there is a need to 
change signs, and why me the assignee). From a productivity point of 
view, having two different families of geometry classes and functors in 
the code is really not a problem. I'll be happy with the previous situation.

I need to revert carefully : the same commit contains independant 
improvments and cleanings in ScGeom (bad mistake). I'll see if I can do 
it today, it  will be soon anyway.

Bruno