Unity3d如何使用LineRenderer画线

这篇文章主要介绍Unity3d如何使用LineRenderer画线，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

LineRenderer线渲染器主要是用于在3D中渲染线段，虽然我们也可以使用GL图像库来渲染线段，但是使用LineRenderer我们可以对线段进行更多的操作，例如:设置颜色，宽度等。在这里要注意LineRenderer渲染出的线段的两个端点是3D世界中的点，即他是属于世界坐标（World Point）中的。

LineRenderer是以组件形成存在的，首先我们新建一个空的Game Object，然后我们选择"Component→Effects→Line Renderer"，即可为其添加LineRenderer组件了。

其实我们也可以通过脚本来为其添加LineRenderer组件：

LineRenderer lineRenderer = gameObject.AddComponent();

获取LineRenderer组件：

lineRenderer = GetComponent();

【 案例】根据鼠标左击的位置，来持续绘制线段

首先我们在场景中新建一个空的 GameObject，并Reset一下。然后将Script1脚本添加给他。

using UnityEngine;  using System.Collections;  using System.Collections.Generic;  //[RequireComponent(typeof(LineRenderer))]  public class DrawLine : MonoBehaviour  {      private LineRenderer line;      private bool isMousePressed;      private List pointsList;      private Vector3 mousePos;      //private Vector3 m_DownCamPos;      //private Vector3 m_mouseDownStartPos;      //主相机节点下      // Structure for line points      struct myLine      {          public Vector3 StartPoint;          public Vector3 EndPoint;      };      //  -----------------------------------       void Awake() {          _Init();      }        private void _Init() {          if (m_init) return;          m_init = true;          // Create line renderer component and set its property          //line = this.GetComponent();          line = gameObject.AddComponent();          line.material = new Material(Shader.Find("Particles/Additive"));          line.SetVertexCount(0);          line.SetWidth(0.1f, 0.1f);          line.SetColors(Color.green, Color.green);          line.useWorldSpace = true;            isMousePressed = false;          pointsList = new List();          line.sortingLayerName = "Ignore Raycast";          line.sortingOrder = 999;          //      renderer.material.SetTextureOffset(          //m_mainCam = this.GetComponent();      }      bool m_init = false;      //Camera m_mainCam;      //  -----------------------------------       void Update() {          // If mouse button down, remove old line and set its color to green          if (Input.GetMouseButtonDown(1)) {              isMousePressed = true;              line.SetVertexCount(0);              pointsList.RemoveRange(0, pointsList.Count);              line.SetColors(Color.green, Color.green);              //m_DownCamPos = Camera.main.transform.position;              //m_mouseDownStartPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.nearClipPlane + 1f));             }          else if (Input.GetMouseButtonUp(1)) {              isMousePressed = false;          }                    //if (Input.GetMouseButton(0) || Input.GetMouseButton(1) || Input.GetMouseButton(2)) {          //    Vector3 crelpos = Camera.main.transform.position;          //    for (int i = 0; i < pointsList.Count; i++) {          //        line.SetPosition(i, crelpos + pointsList[i]);          //        //line.SetPosition(pointsList.Count - 1, (Vector3)pointsList[pointsList.Count - 1]);          //    }          //}          // Drawing line when mouse is moving(presses)          if (isMousePressed) {              Vector3 crelpos = Camera.main.transform.position;              //将鼠标点击的屏幕坐标转换为世界坐标，然后存储到position中              mousePos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.nearClipPlane + 1f));              Vector3 offsetpos = mousePos - crelpos;              //Vector3 hitp = Vector3.zero;              //bool ok = GetRayCastZero2DPlanePoint(Camera.main, Camera.main.transform.TransformPoint(0f, 0f, Camera.main.nearClipPlane + 1f).z, out hitp);              //mousePos = hitp;              if (!pointsList.Contains(offsetpos)) {                  pointsList.Add(offsetpos);                  line.SetVertexCount(pointsList.Count);                                   for (int i = 0; i < pointsList.Count; i++) {                      line.SetPosition(i, crelpos + pointsList[i]);                      //line.SetPosition(pointsList.Count - 1, (Vector3)pointsList[pointsList.Count - 1]);                  }                  if (isLineCollide()) {                      isMousePressed = false;                      line.SetColors(Color.red, Color.red);                  }              }          }      }            //  -----------------------------------       //  Following method checks is currentLine(line drawn by last two points) collided with line       //  -----------------------------------       private bool isLineCollide() {          if (pointsList.Count < 2)              return false;          int TotalLines = pointsList.Count - 1;          myLine[] lines = new myLine[TotalLines];          if (TotalLines > 1) {              for (int i = 0; i < TotalLines; i++) {                  lines[i].StartPoint = (Vector3)pointsList[i];                  lines[i].EndPoint = (Vector3)pointsList[i + 1];              }          }          for (int i = 0; i < TotalLines - 1; i++) {              myLine currentLine;              currentLine.StartPoint = (Vector3)pointsList[pointsList.Count - 2];              currentLine.EndPoint = (Vector3)pointsList[pointsList.Count - 1];              if (isLinesIntersect(lines[i], currentLine))                  return true;          }          return false;      }      //  -----------------------------------       //  Following method checks whether given two points are same or not      //  -----------------------------------       private bool checkPoints(Vector3 pointA, Vector3 pointB) {          return (pointA.x == pointB.x && pointA.y == pointB.y);      }      //  -----------------------------------       //  Following method checks whether given two line intersect or not      //  -----------------------------------       private bool isLinesIntersect(myLine L1, myLine L2) {          if (checkPoints(L1.StartPoint, L2.StartPoint) ||              checkPoints(L1.StartPoint, L2.EndPoint) ||              checkPoints(L1.EndPoint, L2.StartPoint) ||              checkPoints(L1.EndPoint, L2.EndPoint))              return false;            return ((Mathf.Max(L1.StartPoint.x, L1.EndPoint.x) >= Mathf.Min(L2.StartPoint.x, L2.EndPoint.x)) &&                 (Mathf.Max(L2.StartPoint.x, L2.EndPoint.x) >= Mathf.Min(L1.StartPoint.x, L1.EndPoint.x)) &&                 (Mathf.Max(L1.StartPoint.y, L1.EndPoint.y) >= Mathf.Min(L2.StartPoint.y, L2.EndPoint.y)) &&                 (Mathf.Max(L2.StartPoint.y, L2.EndPoint.y) >= Mathf.Min(L1.StartPoint.y, L1.EndPoint.y))                 );      }  }

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