本文實(shí)例為大家分享了Unity3D網(wǎng)格功能生成球體網(wǎng)格模型的具體代碼，供大家參考，具體內(nèi)容如下
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前面已經(jīng)講過怎樣使用mesh生成一個(gè)自己的網(wǎng)格，那么本文將會(huì)講述怎樣將這個(gè)網(wǎng)格變換成自己想要的形狀，比如一個(gè)球體。
我們需要知道一個(gè)從平面坐標(biāo)到球體坐標(biāo)的映射公式。假設(shè)平面坐標(biāo)是（x，y），球體坐標(biāo)是（x0，y0，z0），則
球體坐標(biāo)（x0，y0，z0）可以通過以下代碼得到，（x，y） 對(duì)應(yīng)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);
完整代碼在最后，將完整的腳本綁定到一個(gè)空物體上，把棋盤格圖案chessboard.jpg放到Assets\Resources下，還要在場景中生成一個(gè)sphere作為顯示網(wǎng)格頂點(diǎn)的輔助物體。一切就緒后，運(yùn)行效果如下：
重慶分公司
重慶分公司
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();
gameObject.AddComponent();
Texture img = (Texture)Resources.Load("tm");
gameObject.GetComponent().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().mesh = mesh;
}
}
以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。
