public class CreateMesh: MonoBehaviour
{
    void Start()
    {
	    			//該方法會新建一個名為Mesh的GameObject，該物體上包含一個 MeshFilter 和一個 MeshRenderer
        GameObject gameObject = new GameObject("Mesh", typeof(MeshFilter), typeof(MeshRenderer));
        gameObject.transform.localScale = new Vector3(30, 30, 1);//放大一點，避免到時候看不見
    }
}

然后將腳本搭載到場景中任意物體上
點擊運行后場景出現(xiàn)名為Mesh的物體，包含MeshFilter和 MeshRenderer,也可自行添加組件

這里Mesh Filter中的Mesh為None
因為我們還沒有創(chuàng)建Mesh

2.通過腳本創(chuàng)建Mesh

Unity中Mesh由頂點、三角面和UV坐標(biāo)組成
如果我們創(chuàng)建一個正方形，需要先聲明相應(yīng)數(shù)組
修改Create Mesh

//public class CreateMesh: MonoBehaviour
//{
   // void Start()
    //{
        Vector3[] vertices = new Vector3[0];	//聲明頂點數(shù)組
        Vector2[] uv = new Vector2[0];		    //聲明uv向量
        int[] triangles = new int[0];		    //聲明三角形數(shù)組
        Mesh mesh = new Mesh();				   //聲明網(wǎng)格
	    //對網(wǎng)格進(jìn)行賦值引用
        mesh.vertices = vertices;
        mesh.uv = uv;
        mesh.triangles = triangles;
        //GameObject gameObject = new GameObject("Mesh", typeof(MeshFilter), typeof(MeshRenderer));
        //gameObject.transform.localScale = new Vector3(30, 30, 1);
		
	    //將新建物體的 MeshFilter 設(shè)為新建的 網(wǎng)格（Mesh）
        gameObject.GetComponent<MeshFilter>().mesh = mesh;
    //}
//}

這時運行后Mesh Filter 中 Mesh 不再是null，而是我們剛剛聲明的網(wǎng)格，只是這個網(wǎng)格還沒有相應(yīng)的數(shù)據(jù)

繼續(xù)修改CreateMesh

//public class GameHandler5 : MonoBehaviour
//{
    //這里聲明了一個材質(zhì)，給它賦值一個帶貼圖的材質(zhì)，不用材質(zhì)也行
    public Material material;
    //void Start()
    //{
	//這里我們創(chuàng)建一個正方形網(wǎng)格，所以需要4個頂點、4個UV點和6條邊
        Vector3[] vertices = new Vector3[4];	
        Vector2[] uv = new Vector2[4];
        int[] triangles = new int[6];
	//聲明頂點的位置
        vertices[0] = new Vector3(0, 1);
        vertices[1] = new Vector3(1, 1);
        vertices[2] = new Vector3(0, 0);
        vertices[3] = new Vector3(1, 0);
	//聲明UV的位置
        uv[0] = new Vector2(0, 1);
        uv[1] = new Vector2(1, 1);
        uv[2] = new Vector2(0, 0);
        uv[3] = new Vector2(1, 0);
	//聲明三角邊，這里三角邊是根據(jù)上面的頂點來進(jìn)行連接的，每三個頂點構(gòu)成一個三角邊
        //這里后面的int類型參數(shù)對應(yīng) vertices[]數(shù)組中的頂點
        triangles[0] = 0;
        triangles[1] = 1;
        triangles[2] = 2;
        triangles[3] = 2;
        triangles[4] = 1;
        triangles[5] = 3;
        //Mesh mesh = new Mesh();
	//將設(shè)置好的參數(shù)進(jìn)行賦值
        mesh.vertices = vertices;
        mesh.uv = uv;
        mesh.triangles = triangles;
        //GameObject gameObject = new GameObject("Mesh", typeof(MeshFilter), typeof(MeshRenderer));
        //gameObject.transform.localScale = new Vector3(30, 30, 1);
        //gameObject.GetComponent<MeshFilter>().mesh = mesh;
        gameObject.GetComponent<MeshRenderer>().material = material;
    }
}

這個正方形存在 4個頂點、分為兩個三角形共 6 條邊、和 4 頂點 UV
運行結(jié)果