78 lines
3.2 KiB
C#
78 lines
3.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Text;
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namespace XNet.Business.Parser
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{
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public class SimpleObjParser
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{
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public class ObjData
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{
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public required float[] Vertices { get; set; }
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public required int[] Indices { get; set; }
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}
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public static ObjData Parse(string filePath)
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{
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var verts = new List<float>();
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var indices = new List<int>();
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if (!File.Exists(filePath)) throw new FileNotFoundException("Obj file not found", filePath);
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var lines = File.ReadAllLines(filePath);
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foreach (var line in lines)
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{
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var trimmed = line.Trim();
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if (string.IsNullOrEmpty(trimmed) || trimmed.StartsWith("#")) continue;
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var parts = trimmed.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length == 0) continue;
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if (parts[0] == "v")
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{
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float x = float.Parse(parts[1], CultureInfo.InvariantCulture);
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float y = float.Parse(parts[2], CultureInfo.InvariantCulture);
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float z = float.Parse(parts[3], CultureInfo.InvariantCulture);
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//verts.Add(x);
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//verts.Add(y);
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//verts.Add(z);
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// ========================================
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// ✅ 修改点 1【核心】：右手坐标系OBJ → 左手坐标系 顶点修正
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// Unity导出的右手OBJ Z轴是反向的，这里取反Z轴，适配DotRecast左手坐标系
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// 唯一改动：z → -z ，X/Y完全不变！
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// ========================================
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verts.Add(-x); // ✅ 新增：X轴取负，解决Cocos左右颠倒
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verts.Add(y);
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verts.Add(-z);
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}
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else if (parts[0] == "f")
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{
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if (parts.Length >= 4)
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{
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int v1 = int.Parse(parts[1].Split('/')[0]) - 1;
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int v2 = int.Parse(parts[2].Split('/')[0]) - 1;
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int v3 = int.Parse(parts[3].Split('/')[0]) - 1;
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indices.Add(v1);
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indices.Add(v2);
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indices.Add(v3);
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// ========================================
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// ✅ 修改点 2【核心必改】：反转三角面绕序，修正法线/面朝向
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// 右手OBJ的面是顺时针，DotRecast左手要求逆时针，交换v2和v3即可
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// 这行代码是解决「导航网格加载为0、寻路失效」的关键！
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// ========================================
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//indices.Add(v1);
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//indices.Add(v3); // 交换：原v2 → 现v3
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//indices.Add(v2); // 交换：原v3 → 现v2
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}
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}
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}
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return new ObjData { Vertices = verts.ToArray(), Indices = indices.ToArray() };
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}
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}
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} |