Unity3D网格功能生成球体网格模型

本文实例为大家分享了Unity3D网格功能生成球体网格模型的具体代码，供大家参考，具体内容如下

前面已经讲过怎样使用mesh生成一个自己的网格，那么本文将会讲述怎样将这个网格变换成自己想要的形状，比如一个球体。

我们需要知道一个从平面坐标到球体坐标的映射公式。假设平面坐标是（x，y），球体坐标是（x0，y0，z0），则

球体坐标（x0，y0，z0）可以通过以下代码得到，（x，y） 对应vertices[i].x和vertices[i].y。

v.x = r * Mathf.Cos(vertices[i].x / width * 2 * Mathf.PI) * Mathf.Cos(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);
v.y = r * Mathf.Sin(vertices[i].x / width * 2 * Mathf.PI) * Mathf.Cos(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);
v.z = r * Mathf.Sin(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);

完整代码在最后，将完整的脚本绑定到一个空物体上，把棋盘格图案chessboard.jpg放到Assets\Resources下，还要在场景中生成一个sphere作为显示网格顶点的辅助物体。一切就绪后，运行效果如下：

using UnityEngine;
using System.Collections;

public class BallMesh : MonoBehaviour
{

Mesh mesh;
Vector3[] vertices;
Vector2[] uv;
int[] triangles;
Vector3[] normals;
public GameObject sphere;
GameObject[] spheres;

void Start()
{
 gameObject.AddComponent<MeshFilter>();
 gameObject.AddComponent<MeshRenderer>();
 Texture img = (Texture)Resources.Load("tm");
 gameObject.GetComponent<Renderer>().material.mainTexture = img;
 mesh = new Mesh();
 int m = 25; //row
 int n = 50; //col
 float width = 8;
 float height = 6;
 vertices = new Vector3[(m + 1) * (n + 1)];//the positions of vertices
 spheres = new GameObject[(m + 1) * (n + 1)];
 uv = new Vector2[(m + 1) * (n + 1)];
 normals = new Vector3[(m + 1) * (n + 1)];
 triangles = new int[6 * m * n];
 for (int i = 0; i < vertices.Length; i++)
 {
  float x = i ％ (n + 1);
  float y = i / (n + 1);
  float x_pos = x / n * width;
  float y_pos = y / m * height;
  vertices[i] = new Vector3(x_pos, y_pos, 0);
  float u = x / n;
  float v = y / m;
  uv[i] = new Vector2(u, v);
 }
 for (int i = 0; i < 2 * m * n; i++)
 {
  int[] triIndex = new int[3];
  if (i ％ 2 == 0)
  {
   triIndex[0] = i / 2 + i / (2 * n);
   triIndex[1] = triIndex[0] + 1;
   triIndex[2] = triIndex[0] + (n + 1);
  }
  else
  {
   triIndex[0] = (i + 1) / 2 + i / (2 * n);
   triIndex[1] = triIndex[0] + (n + 1);
   triIndex[2] = triIndex[1] - 1;

}
  triangles[i * 3] = triIndex[0];
  triangles[i * 3 + 1] = triIndex[1];
  triangles[i * 3 + 2] = triIndex[2];
 }

int r = 10;
 for (int i = 0; i < vertices.Length; i++)
 {
  spheres[i] = Instantiate( sphere,this.transform) as GameObject;
  Vector3 v ;
  v.x = r * Mathf.Cos(vertices[i].x / width * 2 * Mathf.PI) * Mathf.Cos(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);
  v.y = r * Mathf.Sin(vertices[i].x / width * 2 * Mathf.PI) * Mathf.Cos(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);
  v.z = r * Mathf.Sin(vertices[i].y / height * Mathf.PI - Mathf.PI / 2);
  //v = vertices[i];

vertices[i] = v;
  spheres[i].transform.localPosition = v;

normals[i] = new Vector3(0,1,0);
 }

mesh.vertices = vertices;
 mesh.normals = normals;
 mesh.uv = uv;
 mesh.triangles = triangles;
 this.GetComponent<MeshFilter>().mesh = mesh;

}

}

来源：https://blog.csdn.net/zzlyw/article/details/53256916