Obj格式解析以及在Unity3D下导入测试

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

namespace Hont
{
public static class ObjFormatAnalyzerFactory
{
public static GameObject AnalyzeToGameObject(string objFilePath)
{
if (!File.Exists(objFilePath)) return null;

var objFormatAnalyzer = new ObjFormatAnalyzer();

objFormatAnalyzer.Analyze(File.ReadAllText(objFilePath));

var go = new GameObject();
var meshRenderer = go.AddComponent<MeshRenderer>();
var meshFilter = go.AddComponent<MeshFilter>();

var mesh = new Mesh();

var sourceVertexArr = objFormatAnalyzer.VertexArr;
var sourceUVArr = objFormatAnalyzer.VertexTextureArr;
var faceArr = objFormatAnalyzer.FaceArr;
var notQuadFaceArr = objFormatAnalyzer.FaceArr.Where(m => !m.IsQuad).ToArray();
var quadFaceArr = objFormatAnalyzer.FaceArr.Where(m => m.IsQuad).ToArray();
var vertexList = new List<Vector3>();
var uvList = new List<Vector2>();

var triangles = new int[notQuadFaceArr.Length * 3 + quadFaceArr.Length * 6];
for (int i = 0, j = 0; i < faceArr.Length; i++)
{
var currentFace = faceArr[i];

triangles[j] = j;
triangles[j + 1] = j + 1;
triangles[j + 2] = j + 2;

var vec = sourceVertexArr[currentFace.Points[0].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

var uv = sourceUVArr[currentFace.Points[0].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));

vec = sourceVertexArr[currentFace.Points[1].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

uv = sourceUVArr[currentFace.Points[1].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));

vec = sourceVertexArr[currentFace.Points[2].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

uv = sourceUVArr[currentFace.Points[2].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));

if (currentFace.IsQuad)
{
triangles[j + 3] = j + 3;
triangles[j + 4] = j + 4;
triangles[j + 5] = j + 5;
j += 3;

vec = sourceVertexArr[currentFace.Points[0].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

uv = sourceUVArr[currentFace.Points[0].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));

vec = sourceVertexArr[currentFace.Points[2].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

uv = sourceUVArr[currentFace.Points[2].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));

vec = sourceVertexArr[currentFace.Points[3].VertexIndex - 1];
vertexList.Add(new Vector3(vec.X, vec.Y, vec.Z));

uv = sourceUVArr[currentFace.Points[3].TextureIndex - 1];
uvList.Add(new Vector2(uv.X, uv.Y));
}

j += 3;
}

mesh.vertices = vertexList.ToArray();
mesh.uv = uvList.ToArray();
mesh.triangles = triangles;

meshFilter.mesh = mesh;
meshRenderer.material = new Material(Shader.Find("Standard"));

return go;
}
}
}

public class ObjFormatAnalyzerTest : MonoBehaviour
{
void Start()
{
var go = ObjFormatAnalyzerFactory.AnalyzeToGameObject(@"D:\TestObj\centaur.obj");

WWW www = new WWW("file:/D:/TestObj/texture.jpg");

while (!www.isDone) { }

go.GetComponent<MeshRenderer>().material.mainTexture = www.texture;
}
}