LineRenderer.SetColors 设置颜色

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);
	}
}

// Adds a lineRenderer to this transform and
// makes the line renderer to fade at the end.
//添加一个线渲染器给这个变换，并且使线渲染渐变到末尾

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);
}