unity 导入STL格式模型（STL二进制格式文件）

unity 导入STL格式模型（STL二进制格式文件）

using System.Collections;using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using UnityEngine;public class Binary : MonoBehaviour{private string _fileName = "";private string _trianglescount = "";private int _total;//三角形个数，_total*3即为三角形顶点个数private int _number;private BinaryReader _binaryReader;private List<Vector3> _vertices;private List<int> _triangles;/// <summary>///获得STL模型名称和三角形数量/// </summary>private void GetFileNameAndTrianglesCount(){//string fullPath = Path.GetFullPath(AssetDatabase.GetAssetPath(target));//string fullPath = "D:\\UnityProject\\DrawMesh\\Assets\\ImportSTL\\徽章.stl";string fullPath = "E:\\unity\\project\\test\\Assets\\STL\\dangban_2.stl";using (BinaryReader br = new BinaryReader(File.Open(fullPath, FileMode.Open))){_fileName = Encoding.UTF8.GetString(br.ReadBytes(80));//stl二进制文件中，前80个字节为模型名称_trianglescount = BitConverter.ToInt32(br.ReadBytes(4), 0).ToString();//之后4个字节存储的是模型三角形数量}}/// <summary>/// 创建STL模型实例/// </summary>private void CreateInstance(){//string fullPath = "D:\\UnityProject\\DrawMesh\\Assets\\ImportSTL\\徽章.stl";string fullPath = "E:\\unity\\project\\test\\Assets\\STL\\dangban_2.stl";int gameObjectCount = 60000;//代表一个物体中包含多少个点（Unity中单个Mesh顶点数量最多为65000个）_total = int.Parse(_trianglescount);_number = 0;_binaryReader = new BinaryReader(File.Open(fullPath, FileMode.Open));//抛弃前84个字节_binaryReader.ReadBytes(84);_vertices = new List<Vector3>();//存储三角形顶点坐标_triangles = new List<int>();//存储三角形索引while (_number < _total){byte[] bytes;//每50个字节一组，存储着三角形的法矢量和三个点的顶点数据bytes = _binaryReader.ReadBytes(50);if (bytes.Length < 50){_number += 1;continue;}//这里只用了三角形的顶点数据，忽略矢量Vector3 vec1 = new Vector3(BitConverter.ToSingle(bytes, 12), BitConverter.ToSingle(bytes, 16), BitConverter.ToSingle(bytes, 20));Vector3 vec2 = new Vector3(BitConverter.ToSingle(bytes, 24), BitConverter.ToSingle(bytes, 28), BitConverter.ToSingle(bytes, 32));Vector3 vec3 = new Vector3(BitConverter.ToSingle(bytes, 36), BitConverter.ToSingle(bytes, 40), BitConverter.ToSingle(bytes, 44));_vertices.Add(vec1);_vertices.Add(vec2);_vertices.Add(vec3);_number += 1;}//将索引写入列表中，值为0到每个物体中顶点个数减一for (int triNum = 0; triNum < _vertices.Count; triNum++){int gameObhectIndex = triNum / gameObjectCount;//标记着当前正在给第几个物体赋值_triangles.Add(triNum - gameObhectIndex * gameObjectCount);}for (int meshNumber = 0; meshNumber < _vertices.Count; meshNumber += gameObjectCount){//创建GameObjectGameObject tem = new GameObject(Path.GetFileNameWithoutExtension(fullPath));tem.name = meshNumber.ToString();MeshFilter mf = tem.AddComponent<MeshFilter>();MeshRenderer mr = tem.AddComponent<MeshRenderer>();Mesh m = new Mesh();mr.name = meshNumber.ToString();if ((_vertices.Count - meshNumber) >= gameObjectCount){m.vertices = _vertices.ToArray().Skip(meshNumber).Take(gameObjectCount).ToArray();m.triangles = _triangles.ToArray().Skip(meshNumber).Take(gameObjectCount).ToArray();}else{m.vertices = _vertices.ToArray().Skip(meshNumber).Take(_vertices.Count - meshNumber).ToArray();m.triangles = _triangles.ToArray().Skip(meshNumber).Take(_vertices.Count - meshNumber).ToArray();}m.RecalculateNormals();mf.mesh = m;mr.material = new Material(Shader.Find("Standard"));_binaryReader.Close();//Debug.Log(tem.name + ":顶点数量 " + _vertices.Count);}}// Start is called before the first frame updatevoid Start(){GetFileNameAndTrianglesCount();CreateInstance();}// Update is called once per framevoid Update(){}}