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    SubjectRe: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]
    On 3/14/07, Dmitry Torokhov <> 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).


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