1 files changed, 115 insertions, 0 deletions
diff --git a/Scripts/Editor/StackTextures3D.cs b/Scripts/Editor/StackTextures3D.cs
new file mode 100644
index 0000000..3e88025
--- /dev/null
+++ b/Scripts/Editor/StackTextures3D.cs
@@ -0,0 +1,115 @@
+using UnityEngine;
+using UnityEditor;
+
+public class StackTextures3D : EditorWindow
+{
+    Texture2D[] _slices = new Texture2D[0];
+    SerializedObject _so;
+    SerializedProperty _slicesProp;
+
+    [MenuItem("Tools/yum_food/Stack Textures to 3D")]
+    static void Open() => GetWindow<StackTextures3D>("Stack Textures to 3D");
+
+    void OnEnable()
+    {
+        _so = new SerializedObject(this);
+    }
+
+    // SerializedObject needs a backing field with SerializeField for array GUI.
+    // Unity EditorWindow supports this natively.
+    [SerializeField] Texture2D[] slices = new Texture2D[0];
+
+    void OnGUI()
+    {
+        _so.Update();
+
+        EditorGUILayout.LabelField("Stack Textures to 3D", EditorStyles.boldLabel);
+        EditorGUILayout.HelpBox(
+            "Provide an ordered array of 2D textures. Each texture becomes one depth slice. " +
+            "All textures must share the same dimensions and format.",
+            MessageType.Info);
+
+        var prop = _so.FindProperty("slices");
+        EditorGUILayout.PropertyField(prop, new GUIContent("Slices"), true);
+        _so.ApplyModifiedProperties();
+
+        if (slices == null || slices.Length == 0)
+            return;
+
+        EditorGUILayout.Space();
+
+        // Show preview info.
+        int nullCount = 0;
+        foreach (var s in slices)
+            if (s == null) nullCount++;
+
+        if (nullCount > 0)
+            EditorGUILayout.HelpBox($"{nullCount} null slot(s) — fill all slots before generating.", MessageType.Warning);
+
+        if (nullCount == 0 && slices.Length > 0)
+        {
+            var first = slices[0];
+            EditorGUILayout.LabelField($"Resolution: {first.width} x {first.height} x {slices.Length}");
+        }
+
+        EditorGUI.BeginDisabledGroup(nullCount > 0);
+        if (GUILayout.Button("Generate"))
+            DoGenerate();
+        EditorGUI.EndDisabledGroup();
+    }
+
+    void DoGenerate()
+    {
+        if (slices.Length == 0)
+            return;
+
+        int width = slices[0].width;
+        int height = slices[0].height;
+        int depth = slices.Length;
+        TextureFormat fmt = slices[0].format;
+
+        for (int i = 1; i < depth; i++)
+        {
+            if (slices[i].width != width || slices[i].height != height)
+            {
+                EditorUtility.DisplayDialog("Error",
+                    $"Slice {i} ({slices[i].name}) is {slices[i].width}x{slices[i].height}, " +
+                    $"expected {width}x{height}.", "OK");
+                return;
+            }
+            if (slices[i].format != fmt)
+            {
+                EditorUtility.DisplayDialog("Error",
+                    $"Slice {i} ({slices[i].name}) format is {slices[i].format}, " +
+                    $"expected {fmt}.", "OK");
+                return;
+            }
+        }
+
+        bool mipMaps = true;
+        var tex = new Texture3D(width, height, depth, fmt, mipMaps);
+
+        for (int z = 0; z < depth; z++)
+        {
+            var pixels = slices[z].GetPixels();
+            for (int y = 0; y < height; y++)
+            for (int x = 0; x < width; x++)
+            {
+                tex.SetPixel(x, y, z, pixels[y * width + x]);
+            }
+        }
+
+        tex.wrapMode = TextureWrapMode.Repeat;
+        tex.filterMode = FilterMode.Trilinear;
+        tex.Apply();
+
+        string dir = System.IO.Path.GetDirectoryName(AssetDatabase.GetAssetPath(slices[0]));
+        string path = $"{dir}/Stacked3D_{width}x{height}x{depth}.asset";
+        path = AssetDatabase.GenerateUniqueAssetPath(path);
+
+        AssetDatabase.CreateAsset(tex, path);
+        AssetDatabase.SaveAssets();
+        EditorGUIUtility.PingObject(tex);
+        Debug.Log($"[StackTextures3D] Saved {width}x{height}x{depth} ({fmt}) to {path}");
+    }
+}