Grapple.cs

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

public class Grapple : MonoBehaviour
{
    private LineRenderer lr;
    private Vector3 grapplePoint;
    public LayerMask Grappable;
    public Transform gunTip, cam, player;
    public float maxDistance;
    private SpringJoint joint;


    // Start is called before the first frame update
    void Start()
    {
        lr = GetComponent<LineRenderer>();
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            StartGrapple();
        }
        else if (Input.GetMouseButtonUp(0))
        {
            StopGrapple();
        }
    }
    private void LateUpdate()
    {
        DrawRope();
    }
    void StartGrapple()
    {
        RaycastHit hit;
        if (Physics.Raycast(cam.position, cam.forward, out hit, maxDistance, Grappable))
        {
            grapplePoint = hit.point;
            joint = player.gameObject.AddComponent<SpringJoint>();
            joint.autoConfigureConnectedAnchor = false;
            joint.connectedAnchor = grapplePoint;

            float distanceFromPoint = Vector3.Distance(player.position, grapplePoint);

            //distance grapple will try to keep from grapplePoint
            joint.maxDistance = distanceFromPoint * 0.6f;
            joint.minDistance = distanceFromPoint * 0.1f;

            joint.spring = 10f;
            joint.damper = 7f;
            joint.massScale = 1000f;

            lr.positionCount = 2;
        }
    }
    void StopGrapple()
    {
        lr.positionCount = 0;
        Destroy(joint);
    }

    void DrawRope()
    {
        if (!joint) return;
        lr.SetPosition(0, gunTip.position);
        lr.SetPosition(1, grapplePoint);
    }

    public bool IsGrappling()
    {
        return joint != null;
    }
    public Vector3 GetGrapplePoint()
    {
        return grapplePoint;
    }
}