// Adds a lineRenderer to this transform and
    // makes the line renderer to fade at the end.
    var c1 : Color = Color.white;
    var c2 : Color = Color(1,1,1,0);
    function Start() {
        var lineRenderer : LineRenderer = gameObject.AddComponent(LineRenderer);
        lineRenderer.material = new Material (Shader.Find("Particles/Additive"));
        lineRenderer.SetColors(c1, c2);
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Color c1 = Color.white;
    public Color c2 = new Color(1, 1, 1, 0);
    void Start() {
        LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
        lineRenderer.material = new Material(Shader.Find("Particles/Additive"));
        lineRenderer.SetColors(c1, c2);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public c1 as Color = Color.white

    public c2 as Color = Color(1, 1, 1, 0)

    def Start():
        lineRenderer as LineRenderer = gameObject.AddComponent[of LineRenderer]()
        lineRenderer.material = Material(Shader.Find('Particles/Additive'))
        lineRenderer.SetColors(c1, c2)