写一个unity加载off格式的模型并绘制出来的脚本

以下是一个Unity中加载.off格式模型并绘制出来的脚本示例：

using UnityEngine;
using System.IO;

public class LoadOffModel : MonoBehaviour
{
    public string fileName; // 模型文件名
    public Material material; // 模型材质

    void Start()
    {
        LoadModel(fileName);
    }

    // 加载.off格式模型
    void LoadModel(string fileName)
    {
        string path = Application.dataPath + "/" + fileName;
        if (!File.Exists(path))
        {
            Debug.LogError("File does not exist: " + path);
            return;
        }

        int numVertices = 0;
        int numFaces = 0;

        // 读取文件
        using (StreamReader reader = new StreamReader(path))
        {
            string line = reader.ReadLine();
            if (line != "OFF")
            {
                Debug.LogError("Invalid OFF file");
                return;
            }

            // 读取顶点数、面数、边数
            line = reader.ReadLine();
            string[] tokens = line.Split(' ');
            numVertices = int.Parse(tokens[0]);
            numFaces = int.Parse(tokens[1]);

            // 读取顶点
            for (int i = 0; i < numVertices; i++)
            {
                line = reader.ReadLine();
                tokens = line.Split(' ');
                Vector3 vertex = new Vector3(float.Parse(tokens[0]), float.Parse(tokens[1]), float.Parse(tokens[2]));
                // 在Unity中绘制顶点
                GameObject point = GameObject.CreatePrimitive(PrimitiveType.Sphere);
                point.transform.position = vertex;
                point.transform.localScale = Vector3.one * 0.1f;
                point.GetComponent<MeshRenderer>().material = material;
            }

            // 读取面
            for (int i = 0; i < numFaces; i++)
            {
                line = reader.ReadLine();
                tokens = line.Split(' ');
                int numIndices = int.Parse(tokens[0]);
                int[] indices = new int[numIndices];
                for (int j = 0; j < numIndices; j++)
                {
                    indices[j] = int.Parse(tokens[j + 1]);
                }
                // 在Unity中绘制面
                GameObject face = new GameObject("Face " + i);
                MeshFilter meshFilter = face.AddComponent<MeshFilter>();
                MeshRenderer meshRenderer = face.AddComponent<MeshRenderer>();
                meshRenderer.material = material;
                Mesh mesh = new Mesh();
                mesh.vertices = new Vector3[] { };
                mesh.triangles = new int[] { };
                mesh.vertices = new Vector3[numIndices];
                mesh.triangles = new int[numIndices];
                for (int j = 0; j < numIndices; j++)
                {
                    mesh.vertices[j] = new Vector3(float.Parse(tokens[(j + 1) * 3]), float.Parse(tokens[(j + 1) * 3 + 1]), float.Parse(tokens[(j + 1) * 3 + 2]));
                    mesh.triangles[j] = j;
                }
                meshFilter.mesh = mesh;
            }
        }
    }
}

使用方法：将该脚本挂载到一个空对象上，将模型文件名和材质赋值给对应的变量，运行程序即可加载并绘制出模型。