lerp method

Q lerp(Q o, double amount)

Linear interpolation between this and o by amount (component-wise).

amount should be in the range [0.0, 1.0].

Implementation

Q lerp(Q o, double amount) => _q(
  x + amount*(o.x - x),
  y + amount*(o.y - y),
  z + amount*(o.z - z),
  w + amount*(o.w - w),
);