-------- 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 <[email protected]> To: Václav Šmilauer <[email protected]>
>> 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 Maître de Conférences Grenoble INP Laboratoire 3SR - bureau E145 BP 53 - 38041, Grenoble cedex 9 - France Tél : 33 4 56 52 86 21 Fax : 33 4 76 82 70 43 ________________ _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
