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[Chiara Modenese <question199540@xxxxxxxxxxxxxxxxxxxxx>]

Question #199540 on Yade changed:
https://answers.launchpad.net/yade/+question/199540

    Status: Open => Answered

Chiara Modenese proposed the following answer:

On 6 Jun 2012, at 11:41, Chareyre wrote:

> Question #199540 on Yade changed:
> https://answers.launchpad.net/yade/+question/199540
> 
>    Status: Answered => Open
> 
> Chareyre is still having a problem:
>> This "irreversible" behaviour happens in all the Yade Laws where the
> rolling is implemented so it is not specific to
> Law2_SCG_MomentPhys_CohesionlessMomentRotation.
> 
> I was not sure of that.
OK.


> 
>> The details of the implementation, however, are different (use of
> quaternions versus incremental implementation). Do you think that this
> could be a good reason for keeping it?
> 
> Maybe not, if the difference is only in implementation.

I believe that is the only difference but I have not tested much because
I started to use the incremental formulation (which I did test but
versus other implementations like Plassiard's formulation - still
incremental). Maybe we could keep it for future reference in case that
kind of use of quaternions became useful.


> Boon is not
> using SMR?
I think he has used it a long time ago for some background analyses but nothing more than that (not sure if he still reads the mailing list so I will have to ask him about it and then let you know).

Chiara


> 
> Bruno
> 
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