Coroutine Help Please

Unity Engine
1

No idea why this isn’t working. The IEnumerator MoveGrenade is to move the grenade above the enemy once it collides with the enemy…which it does. The IEnumerator Capture is supposed to create a line renderer from the grenade to the enemy in increments (basically a line extending from the grenade to the enemy slowly). The problem is after the grenade moves above the enemy, it doesn’t create the line. Any suggestions?

using UnityEngine;
using System.Collections;

public class Grenade : MonoBehaviour {

    public float throwTime;
    public float lineDrawSpeed = 6f;

    private LineRenderer line;
    private Rigidbody grenadeRigidbody;
    private GameObject grenade;
    private float counter;
    private float distance;

    void Awake() {
        line = gameObject.GetComponentInChildren<LineRenderer>();
        grenadeRigidbody = GetComponent<Rigidbody>();
        grenade = gameObject;
    }

    void OnCollisionEnter(Collision col){
        if(col.gameObject.tag == "Enemy"){
            StartCoroutine(Capture(col.gameObject));
        }
    }

    private IEnumerator MoveGrenade(GameObject col){
        Vector3 moveTo = new Vector3(grenade.transform.position.x, col.transform.position.y+0.5f, grenade.transform.position.z);
        while(Vector3.Distance(grenade.transform.position, moveTo) > 0f){
            grenadeRigidbody.velocity = Vector3.zero;
            grenadeRigidbody.angularVelocity = Vector3.zero;
            grenadeRigidbody.Sleep();
            grenade.transform.LookAt(col.transform.position);
            grenade.transform.position = Vector3.Lerp(grenade.transform.position, moveTo, Time.deltaTime);
            yield return null;
        }
    }

    private IEnumerator Capture(GameObject col){
        yield return StartCoroutine(MoveGrenade(col.gameObject));
        Vector3 pointA = gameObject.transform.position;
        Vector3 pointB = col.transform.position;
        distance = Vector3.Distance(pointA, pointB);
        while(counter < distance){
                counter += .1f / lineDrawSpeed;

                float x = Mathf.Lerp(0, distance, counter);

                Vector3 pointAlongLine = x * Vector3.Normalize(pointB - pointA) + pointA;

                line.SetPosition(1, pointAlongLine);
            }
            yield return null;
    }

}
2 
grenade.transform.position = Vector3.Lerp(grenade.transform.position, moveTo, Time.deltaTime);

This might be the problem. Instead of incrementing the grenades position slowly that way, you could store the grenade’s position before you start the loop, then Lerp it towards the moveTo position until your Lerp float parameter is 1f or close to 1f.

The increment between the position of grenade.transform.position and moveTo might become so small that the distance percantage of Time.deltatime from the grenade.transform.position is close enough to 0 that your current sentinel is never reached.