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

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Date:	Wed, 14 Mar 2007 15:13:31 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"STenyaK (Bruno González)" <stenyak@...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, STenyaK (Bruno González) <stenyak@...il.com> wrote:
>
>
> On 3/14/07, Anssi Hannula <anssi.hannula@...il.com> wrote:
> > >> Do we have any idea if there any users of FF out there?
> > >
> > > At least me :). I'm using it for wheel and joystick in modules for
> locally
> > > developped multiplatform virtual reality system.
> >
> > Wine and BZflag come to mind, though I think the support is quite
> > limited in both.
> >
>
> There's also vDrift (racing sim), they added support very recently.
> I plan to add it in my car sim too, but there's still nothing coded.
>
> 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.

> By the way, is this the correct list for asking trivial questions (such as
> questions about how the ff api works), or is it only for development of
> kernel?

Since it is kernel-provided API linux-input list should be fine and I
think linux-kernel as well.

-- 
Dmitry
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