Merge pull request #1 from HankunYu/dev

Add new package Utilis

Assets/Packages/Utilis/README.md

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+## Utilis
+
+A collection of useful utilities for Unity development.
+
+
+
+### General
+
+1. <u>ReverseNormals</u> 
+   - require MeshFilter component, will reverse mesh normals after start
+
+
+
+### Extensions
+
+1. <u>GetAllChildren</u>
+   - return all children's transform
+   - Etc. transform.GetAllChildren
+

Assets/Packages/Utilis/Runtime/ReverseNormals.cs

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+using UnityEngine;
+
+public class ReverseNormals : MonoBehaviour
+{
+    private void Start()
+    {
+        var meshFilter = GetComponent<MeshFilter>();
+        if (meshFilter == null)
+        {
+            Debug.LogError("Mesh filter not found!");
+            return;
+        }
+
+        var mesh = meshFilter.mesh;
+        var normals = mesh.normals;
+
+        // 反转法线方向
+        for (var i = 0; i < normals.Length; i++)
+        {
+            normals[i] = -normals[i];
+        }
+
+        mesh.normals = normals;
+
+        // 重新计算顶点顺序以保持正确的渲染
+        for (var i = 0; i < mesh.subMeshCount; i++)
+        {
+            var triangles = mesh.GetTriangles(i);
+            for (var j = 0; j < triangles.Length; j += 3)
+            {
+                (triangles[j], triangles[j + 1]) = (triangles[j + 1], triangles[j]);
+            }
+
+            mesh.SetTriangles(triangles, i);
+        }
+    }
+}

Assets/Packages/Utilis/Runtime/TransformExtensions.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+public static class TransformExtensions
+{
+    /// <summary>
+    /// Get all children of a transform
+    /// </summary>
+    /// <param name="transform"></param>
+    /// <returns>List of all children transform</returns>
+    public static List<Transform> GetAllChildren(this Transform transform)
+    {
+        var children = new List<Transform>();
+        GetAllChildrenRecursive(transform, children);
+        return children;
+    }
+
+    private static void GetAllChildrenRecursive(Transform transform, List<Transform> children)
+    {
+        foreach (Transform child in transform)
+        {
+            children.Add(child);
+            GetAllChildrenRecursive(child, children);
+        }
+    }
+}

Assets/Packages/Utilis/Runtime/com.hankun.utilis.asmdef

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+{
+	"name": "com.hankun.utilis"
+}

Assets/Packages/Utilis/package.json

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+{
+    "name": "com.hankun.utilis",
+    "version": "1.0.0",
+    "displayName": "Utilis",
+    "description": "A collection of useful utilities for Unity development.",
+    "unity": "2020.3",
+    "author": {
+        "name": "hankun",
+        "email": "kmcyd1@gmail.com"
+    }
+}