本文实例为大家分享了Unity3D生成一段隧道网格的具体代码，供大家参考，具体内容如下
一、需求
最近有一个需求，生成段隧道的骨架网格。目前想到的方法就是，获取隧道网格，通过一个算法分离内框和外框的点：
然后通过外框和内框上的点画线，可以通过深度优先搜索得到内外两个环的序列， 从而实现骨架网格
二、生成隧道算法
隧道由段圆弧和一条直线组成，所以算法如下：
1、取圆心为0，0，0，和圆上半径的向量 \underset{OB}{\rightarrow} ，绕z轴，旋转向量\underset{OB}{\rightarrow}，取到圆上的点，外框上的点同理可得
2、平移内外框上的点，z轴加上偏离，得到隧道另一端的点
3、取相邻外框上的点和平移后的四个点，生成两个三角形。内框同理可得。
三、效果如下：
四、实现：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class MeshCreater : MonoBehaviour
{
Mesh mesh;
public Material mat;//mesh材质
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();//重置法线
mesh.RecalculateBounds(); //重置范围
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;
// 设置顶点信息
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
// 设置索引
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未计算，所以使用贴图时有问题
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
