From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751627AbXCOVG7 (ORCPT ); Thu, 15 Mar 2007 17:06:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751643AbXCOVG6 (ORCPT ); Thu, 15 Mar 2007 17:06:58 -0400 Received: from ug-out-1314.google.com ([66.249.92.168]:3529 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751627AbXCOVG5 convert rfc822-to-8bit (ORCPT ); Thu, 15 Mar 2007 17:06:57 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=nnPgQDF03+ddS8KT1wy0M3ztRhuA8CDso89KCkrq79sQenm3NFodeet3Iysc4LZkpHqiI37wBW+oWLA4rboOt5nJ26cJi2NGcH5OO2YfsCO2vQTzw2KzPk3Gk5qgdPdpdy/b2r/BKvvzu2Gkdzd4HhD+BrhTvm0m9NwdHFBLMpk= Message-ID: <8e4ff20a0703151406v77dbf67fh2071f349065d40d4@mail.gmail.com> Date: Thu, 15 Mar 2007 22:06:54 +0100 From: "=?ISO-8859-1?Q?STenyaK_(Bruno_Gonz=E1lez)?=" To: "johann deneux" Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver] Cc: "Dmitry Torokhov" , "Anssi Hannula" , "Jiri Slaby" , "Linux kernel mailing list" , linux-input@atrey.karlin.mff.cuni.cz In-Reply-To: <38b3b7c0703151351i23d42d67n1d7469fd14e433e2@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8BIT Content-Disposition: inline References: <2460126662758025813@fi.muni.cz> <38b3b7c0703131450v2646e63fj2be4b9dda7f928c0@mail.gmail.com> <45F722CE.9000602@gmail.com> <45F82626.8000108@gmail.com> <45F83930.4060401@gmail.com> <8e4ff20a0703141147n4b690ab8g4cc8138d1ecc94e1@mail.gmail.com> <8e4ff20a0703141218r3add7923n74470b5e16f58c5c@mail.gmail.com> <38b3b7c0703151351i23d42d67n1d7469fd14e433e2@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 3/15/07, johann deneux wrote: > On 3/14/07, STenyaK (Bruno González) wrote: > > 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). > > Same remark here. A torque is a 3-dimensional thing, just like a > force. What for do you need 4 components? Simplifying, 3 values defining axis of rotation, 1 defining module of torque.. As i said, i'm not really sure we really need the 4; you most probably are right. -- Saludos, STenyaK _______________________________________________ Site: http://1ksurvivor.homeip.net <1kSurvivor> http://motorsport-sim.org http://kwh.iespana.es http://emuletutorial.info ICQ: 153709484 Mail: stenyak AT gmail DOT com