Light.spotAngle 聚光角度

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public float interval = 0.3F;
	public float minAngle = 10;
	public float maxAngle = 90;
	private float timeLeft;
	void Update() {
		timeLeft -= Time.deltaTime;
		if (timeLeft < 0.0F) {
			timeLeft = interval;
			light.spotAngle = Random.Range(minAngle, maxAngle);
		}
	}
	void Awake() {
		timeLeft = interval;
		light.type = LightType.Spot;
	}
}

// Change spot angle randomly between 'minAngle' and 'maxAngle'
// each 'interval' seconds.
//改变聚光角度，在随机范围minAngle和之间
//每'interval'秒改变一次.
var interval : float = 0.3;
var minAngle : float = 10;
var maxAngle : float = 90;
private var timeLeft : float;

timeLeft = interval;
light.type = LightType.Spot;

function Update () {
	timeLeft -= Time.deltaTime;
	if (timeLeft < 0.0) {
		// time to change!		
		timeLeft = interval;
		light.spotAngle = Random.Range( minAngle, maxAngle );
	}
}