LineRenderer.SetVertexCount 设置线段数

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public Color c1 = Color.yellow;
	public Color c2 = Color.red;
	public int lengthOfLineRenderer = 20;
	void Start() {
		LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
		lineRenderer.material = new Material(Shader.Find("Particles/Additive"));
		lineRenderer.SetColors(c1, c2);
		lineRenderer.SetWidth(0.2F, 0.2F);
		lineRenderer.SetVertexCount(lengthOfLineRenderer);
	}
	void Update() {
		LineRenderer lineRenderer = GetComponent<LineRenderer>();
		int i = 0;
		while (i < lengthOfLineRenderer) {
			Vector3 pos = new Vector3(i * 0.5F, Mathf.Sin(i + Time.time), 0);
			lineRenderer.SetPosition(i, pos);
			i++;
		}
	}
}

// Creates a line renderer that follos a Sin() function
// and animates it.
//创建一个带有旋转的正弦曲线动画
var c1 : Color = Color.yellow;
var c2 : Color = Color.red;
var lengthOfLineRenderer : int = 20;

function Start() {
	var lineRenderer : LineRenderer = gameObject.AddComponent(LineRenderer);
	lineRenderer.material = new Material (Shader.Find("Particles/Additive"));
	lineRenderer.SetColors(c1, c2);
	lineRenderer.SetWidth(0.2,0.2);
	lineRenderer.SetVertexCount(lengthOfLineRenderer);
}

function Update() {
	var lineRenderer : LineRenderer = GetComponent(LineRenderer);
	for(var i : int = 0; i < lengthOfLineRenderer; i++) {
		var pos : Vector3 = Vector3(i * 0.5, Mathf.Sin(i + Time.time), 0);
		lineRenderer.SetPosition(i, pos);
	}
}