Unity_CustomBasicIK

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ChainLink : MonoBehaviour
{
    public GameObject Head;

    //can also be calculated at start using and offset
    static float ChainSize = 1.6f;

    //So that the spawning script and other can use the size of the chains
    public static float GetChainSize()
    {
        return ChainSize;
    }

    private void FixedUpdate()
    {
        //When the link is hooked to something
        if (Head != null)
        {
            //We first get the offset and then break it into distance and direction
            Vector3 offset = this.transform.position - Head.transform.position;
            float distance = offset.magnitude;
            Vector3 direction = offset / distance;

            //Using the direction we place the link
            if (offset != Vector3.zero)//Unity will give a NaN error if offset is zero, it does nothing really
            {
                this.transform.position = Head.transform.position + (direction * ChainSize);
                this.transform.LookAt(Head.transform);
            }
        }
    }
}