Mouse Follow Aim with IK - 2D Bowman

Hi All,

I'm developing a simple 2D bowman game. I'm trying to implement an aiming system whereby the bowman follows the position of the mouse.

I want to use IK to make the graphics look more realistic, so I have two bones, one for the body and another for the arm and head, these appear to work fine.

I have an object for the arm bone with the following script

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Aim_Script : MonoBehaviour
5. {
6.     void Update()
7.     {
8.         var pos = new Vector2(0, Input.mousePosition.y);
9.         pos = Camera.main.ScreenToWorldPoint(pos);
10.         transform.position = pos;
11.     }
12. }

I've then added a Fabrik IK solver to my player sprite, set the object as the effector, set the chain length to 2
(so it only affects the joints on the arm) and generated a target. When I test this, the player sprite spins around and stutters,

I can fix this by adjusting the weight, but then it doesn't follow the mouse properly. I suspect that the IK solver is struggling to solve with pos, but I've been at this for a few hours now and I can't wrap my head around it