读取obj文件用Mesh创建实例化

using UnityEngine;

using System.Collections;

using System.IO;

using System.Collections.Generic;

using System.Globalization;

using UnityEngine.Networking;

using System;

using System.Threading;

using UnityEngine.UI;

public class ObjToUnityNO : MonoBehaviour

{

public Material red;

public Text []AAA;

public static ObjToUnityNO Ins_ObjToUnityNo;

private Mesh dq_mesh;

Vector3[] _vertexArray;

ArrayList _vertexArrayList = new ArrayList();

Vector3[] _normalArray;

ArrayList _normalArrayList = new ArrayList();

Vector2[] _uvArray;

ArrayList _uvArrayList = new ArrayList();

int[] _triangleArray;

ArrayList _facesVertNormUV = new ArrayList();

private void Start()

{

Ins_ObjToUnityNo = this;

}

public void meshas()

{

//调用创建Mesh方法

Draw_mesh(Application.persistentDataPath + "/Sphere_0.obj");//安卓路径（可以）

//Draw_mesh(Application.streamingAssetsPath + "/Cube_0.obj");//PC路径

}

public  void Draw_mesh(string Obj_Path)

{

//初始化mesh

GetComponent<MeshFilter>().mesh = dq_mesh = new Mesh();

dq_mesh.name = "Meshs";

//赋材质

//this.gameObject.GetComponent<MeshRenderer>().material = new Material(Shader.Find("Diffuse"));

this.gameObject.GetComponent<MeshRenderer>().material = red;

//调用方法，获取点、面、法线

init_mesh(Obj_Path);

//点、面、法线赋值生成mesh

dq_mesh.vertices = _vertexArray;

dq_mesh.triangles = _triangleArray;

dq_mesh.normals = _normalArray;

}

void init_mesh(string Obj_Path)

{

if (File.Exists(Obj_Path))

{

//查找对应文件，加载读取

//UnityWebRequest uwr = UnityWebRequest.Get("file://" + Application.streamingAssetsPath + "/Cube_0.obj");

//UnityWebRequest uwr = UnityWebRequest.Get(Application.persistentDataPath + "/Cube_0.obj");

UnityWebRequest uwr = UnityWebRequest.Get("file://" + Obj_Path);

uwr.Send();

Thread.Sleep(2000);//时间等待

//yield return uwr.Send();或用协同程序形式

//分割读取的obj文件

if (uwr.isDone && string.IsNullOrEmpty(uwr.error))

{

string s = uwr.downloadHandler.text;

s = s.Replace("  ", " ");

s = s.Replace("  ", " ");

//调用方法，去分割好的string中找点、面、法线等，给相应的数组赋值

LoadFile(s);

}

else

{

Debug.Log("Don't DownLoad ");

}

}

}

public void LoadFile(string s)

{

string[] lines = s.Split("\n"[0]);

foreach (string item in lines)

{

//调用方法，去分割好的string中找点、面、法线等，给相应的数组赋值

ReadLine(item);

}

ArrayList tempArrayList = new ArrayList();

for (int i = 0; i < _facesVertNormUV.Count; ++i)

{

if (_facesVertNormUV[i] != null)

{

PlacesByIndex indextemp = new PlacesByIndex(i);

indextemp._places.Add(i);

for (int j = 0; j < _facesVertNormUV.Count; ++j)

{

if (_facesVertNormUV[j] != null)

{

if (i != j)

{

Vector3 iTemp = (Vector3)_facesVertNormUV[i];

Vector3 jTemp = (Vector3)_facesVertNormUV[j];

if (iTemp.x == jTemp.x && iTemp.y == jTemp.y)

{

indextemp._places.Add(j);

_facesVertNormUV[j] = null;

}

}

}

}

tempArrayList.Add(indextemp);

}

}

_vertexArray = new Vector3[tempArrayList.Count];

_uvArray = new Vector2[tempArrayList.Count];

_normalArray = new Vector3[tempArrayList.Count];

_triangleArray = new int[_facesVertNormUV.Count];

int teller = 0;

foreach (PlacesByIndex item in tempArrayList)

{

foreach (int item2 in item._places)

{

_triangleArray[item2] = teller;

}

Vector3 vTemp = (Vector3)_facesVertNormUV[item._index];

_vertexArray[teller] = (Vector3)_vertexArrayList[(int)vTemp.x - 1];

if (_uvArrayList.Count > 0)

{

Vector3 tVec = (Vector3)_uvArrayList[(int)vTemp.y - 1];

_uvArray[teller] = new Vector2(tVec.x, tVec.y);

}

if (_normalArrayList.Count > 0)

{

_normalArray[teller] = (Vector3)_normalArrayList[(int)vTemp.z - 1];

}

teller++;

}

}

//读文件内容

public void ReadLine(string s)

{

AAA[3].text = "ReadLine";

char[] charsToTrim = { ' ', '\n', '\t', '\r' };

s = s.TrimEnd(charsToTrim);

string[] words = s.Split(" "[0]);

foreach (string item in words)

item.Trim();

if (words[0] == "v")

_vertexArrayList.Add(new Vector3(System.Convert.ToSingle(words[1], CultureInfo.InvariantCulture), System.Convert.ToSingle(words[2], CultureInfo.InvariantCulture), System.Convert.ToSingle(words[3], CultureInfo.InvariantCulture)));

if (words[0] == "vn")

_normalArrayList.Add(new Vector3(System.Convert.ToSingle(words[1], CultureInfo.InvariantCulture), System.Convert.ToSingle(words[2], CultureInfo.InvariantCulture), System.Convert.ToSingle(words[3], CultureInfo.InvariantCulture)));

if (words[0] == "vt")

_uvArrayList.Add(new Vector3(System.Convert.ToSingle(words[1], CultureInfo.InvariantCulture), System.Convert.ToSingle(words[2], CultureInfo.InvariantCulture)));

if (words[0] == "f")

{

ArrayList temp = new ArrayList();

ArrayList triangleList = new ArrayList();

for (int j = 1; j < words.Length; ++j)

{

Vector3 indexVector = new Vector3(0, 0);

string[] indices = words[j].Split("/"[0]);

indexVector.x = System.Convert.ToInt32(indices[0], CultureInfo.InvariantCulture);

if (indices.Length > 1)

{

if (indices[1] != "")

indexVector.y = System.Convert.ToInt32(indices[1], CultureInfo.InvariantCulture);

}

if (indices.Length > 2)

{

if (indices[2] != "")

indexVector.z = System.Convert.ToInt32(indices[2], CultureInfo.InvariantCulture);

}

temp.Add(indexVector);

}

for (int i = 1; i < temp.Count - 1; ++i)

{

triangleList.Add(temp[0]);

triangleList.Add(temp[i]);

triangleList.Add(temp[i + 1]);

}

foreach (Vector3 item in triangleList)

{

_facesVertNormUV.Add(item);

}

}

}

}

internal class PlacesByIndex

{

public PlacesByIndex(int index)

{

_index = index;

}

public int _index;

public ArrayList _places = new ArrayList();

}

注：此脚本根据obj格式大神代码，根据自己需求，进行读取obj文件，添加数组，构建mesh，进行实例化，可在安卓和PC端实现功能，其他平台未尝试，obj文件不要太大，否则会造成unity卡死情况。如有雷同或更好的方案，可在评论区留言讨论.........