Messages in this thread | | | Date | Wed, 14 Mar 2007 20:18:54 +0100 | From | "STenyaK (Bruno González)" <> | Subject | Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver] |
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On 3/14/07, Dmitry Torokhov <dmitry.torokhov@gmail.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
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