Unity3D开发之利用LineRenderer画曲线

using UnityEngine;using System.Collections;using System.Collections.Generic;public class LinearDrawLine: MonoBehaviour {private int pointCnt = 0;public Color c1 = Color.red;public Color c2 = Color.blue;private LineRenderer lineRenderer;private Vector3 screenPoint;private Vector3 scanPos;private Vector3 first_pos = Vector3.zero;    void Start () { scanPos = gameObject.transform.position; lineRenderer = (LineRenderer)gameObject.GetComponent("LineRenderer"); lineRenderer.material = new Material (Shader.Find("Particles/Additive"));     lineRenderer.SetColors(c1, c2);     lineRenderer.SetWidth(0.02F, 0.02F);     lineRenderer.SetVertexCount(0);  }   void Update(){}void OnMouseDown(){Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);screenPoint = Camera.main.WorldToScreenPoint(scanPos);Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z); Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint);pointCnt = 0;DrawRenderLine(lineRenderer, curPosition);first_pos = curPosition;}void OnMouseDrag(){iTween.ScaleFrom(gameObject,iTween.Hash("x",2,"y",2,"z",2,"time",.1,"easetype","linear"));Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z); Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint);DrawRenderLine(lineRenderer, curPosition);}void DrawRenderLine(LineRenderer line, Vector3 vect3){if((Mathf.Abs(first_pos.x - vect3.x) < 0.1) && (Mathf.Abs(first_pos.y - vect3.y) < 0.1))return;first_pos = vect3;        line.SetVertexCount(++pointCnt);        line.SetPosition(pointCnt-1, vect3);print("new point: "+vect3+"+"+pointCnt);}}

这种方式相比于GL方式来说，它不需要添加到相机中，可以是点击某个物品来画图。

可以直接把这个脚本拉到物品上面就可以用了。