pub fn measure(a: &Connector<D>, b: &Connector<D>) -> [f64; 4]Expand description
Where the coordinates of a joint between a and b are, measured from
where its ends are, by Motion::index: the angle b’s reference is
turned from a’s about a’s axis, in degrees in (-180, 180], and how
far b’s origin is along a’s axis, its reference and the direction
square to both. Only a seed for a solve, which finds the exact values:
read off midpoints.