本文例項為大家分享了Unity3D生成一段隧道網格的具體程式碼，供大家參考，具體內容如下

一、需求

最近有一個需求，生成段隧道的骨架網格。目前想到的方法就是，獲取隧道網格，通過一個演算法分離內框和外框的點：

然後通過外框和內框上的點畫線，可以通過深度優先搜尋得到內外兩個環的序列， 從而實現骨架網格

二、生成隧道演算法

隧道由段圓弧和一條直線組成，所以演算法如下：

1、取圓心為0，0，0，和圓上半徑的向量 \underset{OB}{\rightarrow} ，繞z軸，旋轉向量\underset{OB}{\rightarrow}，取到圓上的點，外框上的點同理可得

2、平移內外框上的點，z軸加上偏離，得到隧道另一端的點

3、取相鄰外框上的點和平移後的四個點，生成兩個三角形。內框同理可得。

三、效果如下：

四、實現：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class MeshCreater : MonoBehaviour
{
 Mesh mesh;
 public Material mat;//mesh材質
 public GameObject game;
 
 // Start is called before the first frame update
 void Start()
 {
  mesh = new Mesh();
  mesh.Clear();
  SetVertivesUV();
  SetTriangles();
  mesh.vertices = vertices.ToArray();
  mesh.triangles = triangles;
  GameObject obj_cell = new GameObject();
  obj_cell.name = "cell";
 
  mesh.RecalculateNormals();//重置法線
 
  mesh.RecalculateBounds(); //重置範圍
 
  obj_cell.AddComponent<MeshFilter>().mesh = mesh;
  obj_cell.AddComponent<MeshRenderer>();
  obj_cell.GetComponent<MeshRenderer>().material = mat;
  
  MeshCaluate mesh_caluate = new MeshCaluate();
  mesh_caluate.CalculateMesh(mesh);
 }
 
 // Update is called once per frame
 void Update()
 {
  
 }
 
 public List<Vector3> vertices = new List<Vector3>();
 
 private float angle = 10;
 
 private float max_angle = 120;
 // 設定頂點資訊
 void SetVertivesUV()
 {
  Vector3 dir1 = new Vector3(Mathf.Sqrt(3f),-1,0);
  Vector3 dir2 = dir1 * 0.8f;
  
  List<Vector3> points1 = new List<Vector3>();
  List<Vector3> points2 = new List<Vector3>();
 
  int count = (int)((360 - max_angle) / angle);
 
  for (int i = 0; i < count; i++)
  {
   Quaternion q= Quaternion.AngleAxis(i * angle,Vector3.forward);
   
   Vector3 point1 = q* dir1;
   Vector3 point2 = q* dir2;
   points1.Add(point1);
   points2.Add(point2);
  }
  points1.Add(points1[0]);
  points2.Add(points2[0]);
 
  for (int i = 0; i < points1.Count; i++)
  {
   var v1 = points1[i];
   var v2 = points2[i];
   var v3 = points1[i];
   v3.z = 10;
   var v4 = points2[i];
   v4.z = 10;
   
   vertices.Add(v1);
   vertices.Add(v3);
   vertices.Add(v2);
   vertices.Add(v4);
  }
 }
 
 private int[] triangles;//索引
 // 設定索引
 void SetTriangles()
 {
  triangles = new int[vertices.Count * 3];
  int c = 0;
  for (int i = 0; i < triangles.Length -12 ; i += 12)
  {
   var v1 = c;
   var v2 = c + 1;
   var v3 = c + 4;
   var v4 = c + 5;
   
   var v5 = c + 2;
   var v6 = c + 3;
   var v7 = c + 6;
   var v8 = c + 7;
   
   triangles[i] = v4;
   triangles[i + 1] = v2;
   triangles[i + 2] = v1;
 
   triangles[i + 3] = v3;
   triangles[i + 4] = v4;
   triangles[i + 5] = v1;
 
   triangles[i + 6] = v5;
   triangles[i + 7] = v6;
   triangles[i + 8] = v8;
   
   triangles[i + 9] = v5;
   triangles[i + 10] = v8;
   triangles[i + 11] = v7;
 
   c += 4;
  }
 }
}

五、缺陷

UV未計算，所以使用貼圖時有問題

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。