yade-users team mailing list archive

[boon chiaweng <booncw@xxxxxxxxxxx>]

Great.  Thanks, everyone!  


Cheers,

CWBoon

> Date: Thu, 10 Dec 2009 10:03:54 +0100
> From: eudoxos@xxxxxxxx
> To: yade-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Yade-users] Fwd: Re:  Questions on equations (contact laws, velocity, libraries)
> 
> 
> 
> -------- Original Message --------
> Subject: 	Re: [Yade-users] Questions on equations (contact laws,
> velocity, libraries)
> Date: 	Wed, 09 Dec 2009 16:59:52 +0100
> From: 	Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>
> To: 	Václav Šmilauer <eudoxos@xxxxxxxx>
> 
> 
> >> Q2. Why are we using the approximated rotations in updating Shear, and
> >> not quaternions.  It has been commented out in many files.  Is there
> >> sth that I'm not aware of?
> >>     
> > I have no idea, but it was written by Olivier and I wouldn't trust it
> > (ok, I know this has become cliche in a way...; you can take it as a
> > joke as well). I think the real reason is that for the incremental
> > formulation, you don't need exact rotations since they cost too much and
> > the linearized form is sufficient. Bruno?
> >
> >   
> Agreed.
> 
> -- 
> 
> _______________
> Chareyre Bruno
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> 
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