pfQuat::squad()

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From: Bram Stolk (bram++at++sara.nl)
Date: 08/17/2000 01:16:48

Hello Performers,

Something I haven't been able to find in the Performer manuals is
the explanation of the args for pfQuat::squad(), which is the
function to do quadratic interpolation of quaternions with.

pfQuat::squad(float t, const pfQuat &q1, const pfQuat &q2,
                     const pfQuat &a, const pfQuat &b);

This function interpolates between q1 and q2, but what are 'a' and 'b'?

My first guess would be that a is the predecessor and b the successor
of the two quaternions q1 and q2 in the interpolation series.

Thus, if I've keyframed a quaternion at keyframe k1,..., kn and
let us say I would like to have a value halfway between k5 and k6,
I would call the squad func as:

result.squad(0.5, k5, k6, k4, k7);

Is this correct?

Many thanks,

    Bram Stolk 

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