Function addConsecutiveBone

addConsecutiveBone(
    chain: Chain2,
    direction: readonly [number, number],
    length: number,
    joint?: Joint2,
): Bone2
Appends a bone starting where the chain currently ends, running length along direction.
Parameters
- chain: Chain2
  the chain to append to, which must already have at least one bone
- direction: readonly [number, number]
  the direction to extend in, assumed to be unit length
- length: number
  the length of the new bone
- joint: Joint2 = ...
  the bone's joint, or a fresh unconstrained one if omitted
Returns Bone2
the appended bone
- Defined in ik/fabrik2.ts:276