写一个unity加载off格式模型的脚本

以下是一个简单的Unity脚本，可以加载OFF格式的模型：

using UnityEngine;
using System.Collections.Generic;
using System.IO;

public class LoadOffModel : MonoBehaviour
{
    public string filePath; // 模型文件路径

    void Start()
    {
        LoadModel(filePath);
    }

    void LoadModel(string filePath)
    {
        List<Vector3> vertices = new List<Vector3>();
        List<int> triangles = new List<int>();

        using (StreamReader reader = new StreamReader(filePath))
        {
            string line = reader.ReadLine();
            string[] header = line.Split(' ');

            int vertexCount = int.Parse(header[0]);
            int faceCount = int.Parse(header[1]);
            int edgeCount = int.Parse(header[2]);

            for (int i = 0; i < vertexCount; i++)
            {
                line = reader.ReadLine();
                string[] vertexValues = line.Split(' ');
                Vector3 vertex = new Vector3(float.Parse(vertexValues[0]), float.Parse(vertexValues[1]), float.Parse(vertexValues[2]));
                vertices.Add(vertex);
            }

            for (int i = 0; i < faceCount; i++)
            {
                line = reader.ReadLine();
                string[] faceValues = line.Split(' ');
                int faceVertexCount = int.Parse(faceValues[0]);
                int[] faceVertices = new int[faceVertexCount];
                for (int j = 0; j < faceVertexCount; j++)
                {
                    faceVertices[j] = int.Parse(faceValues[j+1]);
                }
                triangles.AddRange(TriangulateFace(faceVertices));
            }
        }

        Mesh mesh = new Mesh();
        mesh.vertices = vertices.ToArray();
        mesh.triangles = triangles.ToArray();
        mesh.RecalculateNormals();

        GetComponent<MeshFilter>().mesh = mesh;
    }

    int[] TriangulateFace(int[] faceVertices)
    {
        List<int> triangles = new List<int>();

        for (int i = 2; i < faceVertices.Length; i++)
        {
            triangles.Add(faceVertices[0] - 1);
            triangles.Add(faceVertices[i-1] - 1);
            triangles.Add(faceVertices[i] - 1);
        }

        return triangles.ToArray();
    }
}

使用方法：

1. 在Unity中创建一个空的GameObject，将此脚本添加到该GameObject上；
2. 将要加载的OFF格式模型文件拖拽到该GameObject的Inspector面板中的"File Path"字段中；
3. 运行场景，将会看到OFF格式模型已经被加载并显示在场景中。