linux-kernel - Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <8e4ff20a0703141218r3add7923n74470b5e16f58c5c@mail.gmail.com>
Date:	Wed, 14 Mar 2007 20:18:54 +0100
From:	"STenyaK (Bruno González)" <stenyak@...il.com>
To:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Cc:	"Anssi Hannula" <anssi.hannula@...il.com>,
	"Jiri Slaby" <jirislaby@...il.com>,
	"johann deneux" <johann.deneux@...il.com>,
	"Linux kernel mailing list" <linux-kernel@...r.kernel.org>,
	linux-input@...ey.karlin.mff.cuni.cz
Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

On 3/14/07, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> > I have a question: if the force is to be 3D, why only 3 possible values?
> > What would they be, 3 torques or 3 forces? In the case of car sims (ff
> > steering wheels), only one axis of torque is usually used (except for 6 dof
> > platforms, as mentioned).
> >
>
> I wonder if we could somehow extend or augment FF envelope se we could
> specify a plane for the effect.. Then a vector could be represented by
> a sum 3 constant effects in 3 separate planes and we could also use
> spring and other effects as well.

Ideally, afaik we should use:
-3 values for translation force (linear force): x,y,z components of
the force vector.
-4 values for rotation force (torque): x,y,z,w components of the
quaternion. You can also use euler angles (and i think there are
another one or two notations), which is just 3 values, but i'm not
sure it will be a correct decision (due to the gimbal lock problem,
which may or may not be present in ff devices, dunno).

-- 
Saludos,
     STenyaK

_______________________________________________
Site:   http://1ksurvivor.homeip.net  <1kSurvivor>
         http://motorsport-sim.org     <Motorsport>
         http://kwh.iespana.es         <KuantikalWareHouse>
         http://emuletutorial.info     <EmuleTutorial>
ICQ:    153709484
Mail:   stenyak AT gmail DOT com
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/