Quarternion is simpler then euler to calc. But for me, Quarternion is more diffcult to understand.
------------------------------------ -Regards, Hermet- -----Original Message----- From: "David Seikel"<[email protected]> To: <[email protected]>; Cc: Sent: 2012-07-11 (수) 13:21:48 Subject: Re: [E-devel] E17 Korea meeting, round 2 On Wed, 11 Jul 2012 12:53:30 +0900 Carsten Haitzler (The Rasterman) <raster>@rasterman.com> wrote: > On Wed, 11 Jul 2012 13:39:16 +1000 David Seikel <onefang>@gmail.com> > said: > > > On Wed, 11 Jul 2012 12:03:06 +0900 Carsten Haitzler (The Rasterman) > > <raster>@rasterman.com> wrote: > > > > > On Wed, 11 Jul 2012 11:19:20 +1000 David Seikel > > > <onefang>@gmail.com> said: > > > > > > > On Wed, 11 Jul 2012 09:40:54 +0900 Carsten Haitzler (The > > > > Rasterman) <raster>@rasterman.com> wrote: > > > > > > > > > On Wed, 11 Jul 2012 00:59:32 +0900 Christophe Sadoine > > > > > <chris>@indefini.org> said: > > > > > > > > > > > On 11 July 2012 00:32, Carsten Haitzler > > > > > > <raster>@rasterman.com> wrote: > > > > > > > On Tue, 10 Jul 2012 23:26:50 +0900 Christophe Sadoine > > > > > > > <chris>@indefini.org> said: > > > > > > > > > > > > > >> Hello, > > > > > > >> I just subscribed to the list today, as I was going to > > > > > > >> submit a patch. I live in Seoul and might be able to > > > > > > >> join :) > > > > > > > > > > > > > > are you french? > > > > > > > > > > > > yes... > > > > > > > > > > zut alors! .... le tabernac! :) where do all you french people > > > > > come from? :) sure - come along! the french cabal is growing! > > > > > > > > Usually they come from France. :-P > > > > > > damn! really? it's time we put a stop to this "france" thing. it's > > > breeding all these french people i keep running into! :) :) > > > > > > > > > I am not really working on the libraries or enlightenment. > > > > > > the patch is just a function I need but I don't think many > > > > > > people will use it... it's for rotating an evas map with a > > > > > > quaternion instead of euler angles. > > > > > > > > > > aaarhmmm... i'm trying to think of a use for this, but my > > > > > brain is coming up blank. :) > > > > > > > > Well, in OpenSim / SecondLife based virtual worlds, quaternions > > > > are the native format used for angles. Probably in other 3D > > > > apps as well. Makes life easy when you are dealing with "rotate > > > > A to X, then rotate B to Y relative to A's X rotation" sort of > > > > things. Why would that be important to UI? Well, what happens > > > > if your UI is mapped to the surface of an object in the 3D > > > > world? You walk around that object, it rotates, and the UI is > > > > rotated relative to the combined rotation of the object and > > > > your point of view. The maths for that are a lot easier to > > > > deal with in quaternions than they are in euler angles. > > > > > > ummm with euler u just apply the rotation twice. :) > > > > And what is the difference between the maths for "apply the > > rotation"? Go look it up, also look up "gimbal lock". There's good > > reasons why people use quaternions, it's not just some fancy maths > > to show you have a degree. > > apply in another order :) Guess that's why you can't think of a use for that, you don't understand why people use quaternions. shrugs -- A big old stinking pile of genius that no one wants coz there are too many silver coated monkeys in the world. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ enlightenment-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/enlightenment-devel ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ enlightenment-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
