fix: .gitignore + add 44 language JSON files

EditorCS/SceneIO.cs

@@ -0,0 +1,56 @@
+using System.Globalization;
+
+namespace Lity3DEditor;
+
+public static class SceneIO
+{
+    public static List<SceneNode> Load(string path)
+    {
+        var nodes = new List<SceneNode>();
+        using var reader = new StreamReader(path);
+        string? header = reader.ReadLine();
+        if (header == null || !header.StartsWith("LITY3D_SCENE"))
+            throw new InvalidDataException("不是有效的 Lity3D 场景文件");
+
+        int lineIdx = 1;
+        string? line;
+        while ((line = reader.ReadLine()) != null)
+        {
+            if (string.IsNullOrWhiteSpace(line)) continue;
+            var parts = line.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
+            if (parts.Length < 13) continue;
+
+            var node = new SceneNode
+            {
+                Name = parts[0],
+                ParentIndex = int.Parse(parts[1]),
+                Mesh = Enum.Parse<MeshType>(parts[2], true),
+                MeshPath = parts[3],
+                PosX = float.Parse(parts[4], CultureInfo.InvariantCulture),
+                PosY = float.Parse(parts[5], CultureInfo.InvariantCulture),
+                PosZ = float.Parse(parts[6], CultureInfo.InvariantCulture),
+                RotX = float.Parse(parts[7], CultureInfo.InvariantCulture),
+                RotY = float.Parse(parts[8], CultureInfo.InvariantCulture),
+                RotZ = float.Parse(parts[9], CultureInfo.InvariantCulture),
+                ScaleX = float.Parse(parts[10], CultureInfo.InvariantCulture),
+                ScaleY = float.Parse(parts[11], CultureInfo.InvariantCulture),
+                ScaleZ = float.Parse(parts[12], CultureInfo.InvariantCulture),
+                LineIndex = lineIdx
+            };
+            nodes.Add(node);
+            lineIdx++;
+        }
+        return nodes;
+    }
+
+    public static void Save(string path, List<SceneNode> nodes)
+    {
+        using var writer = new StreamWriter(path);
+        writer.WriteLine("LITY3D_SCENE 1");
+        foreach (var node in nodes)
+        {
+            int parent = node.ParentIndex;
+            writer.WriteLine(node.ToSceneLine(parent));
+        }
+    }
+}