Problem updating line renderer's start and end points positions at runtime

I'm trying to connect two GameObject (sphereObject0 and sphereObject2) with a line renderer lineRenderer0_2.

It shows up fine at first. My problem is that I need the line renderer to update its start and end positions to match the positions of sphereObject0 and sphereObject2.

For some reasons, my line renderer is absolutely static, and I can't find the way to make it adjust its start and end positions together with the spheres.

Here's my C# script, any idea about what I am doing wrong? Any help is greatly appreciated!

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class autoCreateNetwork : MonoBehaviour {
5.  
6.     public bool sphereHasGravity = false;
7.     private Collider coll;
8.     private Renderer rend;
9.     private SpringJoint springJoint;
10.     public Material lines;
11.  
12.     GameObject sphereObject0;
13.     GameObject sphereObject2;
14.     LineRenderer lineRenderer0_2 ;
15.  
16.     void Start () {
17.  
18.         // Spawn a sphere and set it up
19.         sphereObject0 = GameObject.CreatePrimitive(PrimitiveType.Sphere);
20.         sphereObject0.transform.position = new Vector3(-10.2571400951f, 98.8977277884f, -19.9870244083f);
21.         Rigidbody sphereBody0 = sphereObject0.AddComponent<Rigidbody>();
22.         sphereBody0.mass = 1f;
23.         // Physics model
24.         coll = sphereBody0.GetComponent<Collider> ();
25.         PhysicMaterial material0 = new PhysicMaterial();
26.         material0.dynamicFriction = 1;
27.         coll.material = material0;
28.         coll.material.bounciness = .8f;
29.         // Render (color, smoothness, etc.)
30.         rend = sphereBody0.GetComponent<Renderer>();
31.         rend.material.color = new Color32(171,166,164,255);
32.         rend.material.SetFloat("_Metallic", 0.0f);
33.         rend.material.SetFloat("_Glossiness", 0.0f);
34.         sphereBody0.useGravity = sphereHasGravity;
35.         sphereBody0.transform.localScale = new Vector3(0.5f,0.5f,0.5f);
36.  
37.         // Spawn a sphere and set it up
38.         sphereObject2 = GameObject.CreatePrimitive(PrimitiveType.Sphere);
39.         sphereObject2.transform.position = new Vector3(-28.1943570987f, 89.5665878403f, 5.43686642264f);
40.         Rigidbody sphereBody2 = sphereObject2.AddComponent<Rigidbody>();
41.         sphereBody2.mass = 1f;
42.         // Physics model
43.         coll = sphereBody2.GetComponent<Collider> ();
44.         PhysicMaterial material2 = new PhysicMaterial();
45.         material2.dynamicFriction = 1;
46.         coll.material = material2;
47.         coll.material.bounciness = .8f;
48.         // Render (color, smoothness, etc.)
49.         rend = sphereBody2.GetComponent<Renderer>();
50.         rend.material.color = new Color32(105,150,187,255);
51.         rend.material.SetFloat("_Metallic", 0.0f);
52.         rend.material.SetFloat("_Glossiness", 0.0f);
53.         sphereBody2.useGravity = sphereHasGravity;
54.         sphereBody2.transform.localScale = new Vector3(0.5f,0.5f,0.5f);
55.  
56.         // Spawn a line and set it up
57.         GameObject line0_2 = new GameObject();
58.         LineRenderer lineRenderer0_2 = line0_2.AddComponent<LineRenderer>();
59.         lineRenderer0_2.material = lines;
60.         lineRenderer0_2.widthMultiplier = 0.0482773661501f;
61.         lineRenderer0_2.SetPosition(0, sphereObject0.transform.position);
62.         lineRenderer0_2.SetPosition(1, sphereObject2.transform.position);
63.         float alpha0_2 = .9f;
64.         Gradient gradient0_2 = new Gradient();
65.         gradient0_2.SetKeys(
66.             new GradientColorKey[] { new GradientColorKey(new Color32(171,166,164,255), 0.0f), new GradientColorKey(new Color32(105,150,187,255), 1.0f) },
67.             new GradientAlphaKey[] { new GradientAlphaKey(alpha0_2, 0.0f), new GradientAlphaKey(alpha0_2, 1.0f) }
68.         );
69.         lineRenderer0_2.colorGradient = gradient0_2;
70.         lineRenderer0_2.useWorldSpace = true;
71.  
72.     }
73.  
74.     void Update () {
75.  
76.             lineRenderer0_2.SetPosition(0, sphereObject0.transform.position);
77.             lineRenderer0_2.SetPosition(1, sphereObject2.transform.position);
78.  
79.         }
80.     }