Version: 2017.3 (switch to 2018.1b)
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## Description

Set the color gradient describing the color of the line at various points along its length.

```#pragma strict
private var lr: LineRenderer;
function Start() {
lr = GetComponent.<LineRenderer>();
// Set some positions
var positions: Vector3[] = new Vector3[3];
positions[0] = new Vector3(-2.0f, -2.0f, 0.0f);
positions[1] = new Vector3(0.0f, 2.0f, 0.0f);
positions[2] = new Vector3(2.0f, -2.0f, 0.0f);
lr.positionCount = positions.Length;
lr.SetPositions(positions);
// A simple 2 color gradient with a fixed alpha of 1.0f.
var alpha: float = 1.0f;
}```
```using UnityEngine;
using System.Collections;public class ExampleClass : MonoBehaviour
{
private LineRenderer lr;    void Start()
{
lr = GetComponent<LineRenderer>();
lr.material = new Material(Shader.Find("Sprites/Default"));        // Set some positions
Vector3[] positions = new Vector3[3];
positions[0] = new Vector3(-2.0f, -2.0f, 0.0f);
positions[1] = new Vector3(0.0f,  2.0f, 0.0f);
positions[2] = new Vector3(2.0f, -2.0f, 0.0f);
lr.positionCount = positions.Length;
lr.SetPositions(positions);        // A simple 2 color gradient with a fixed alpha of 1.0f.
float alpha = 1.0f;