From 01eeb68639ee4e3a5aeacf321c35a46c7dfe5c3d Mon Sep 17 00:00:00 2001
From: yum <yum.food.vr@gmail.com>
Date: Thu, 20 Feb 2025 17:58:06 -0800
Subject: Add metallic+gloss map

---
 Scripts/Editor/GenerateMetallicGlossMap.cs | 94 ++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Scripts/Editor/GenerateMetallicGlossMap.cs

(limited to 'Scripts/Editor/GenerateMetallicGlossMap.cs')

diff --git a/Scripts/Editor/GenerateMetallicGlossMap.cs b/Scripts/Editor/GenerateMetallicGlossMap.cs
new file mode 100644
index 0000000..78f54cf
--- /dev/null
+++ b/Scripts/Editor/GenerateMetallicGlossMap.cs
@@ -0,0 +1,94 @@
+using UnityEngine;
+using UnityEditor;
+using System.IO;
+
+public class GenerateMetallicGlossMap : EditorWindow
+{
+    private Texture2D metallicMap;
+    private Texture2D smoothnessMap;
+    private bool invertSmoothness = false;
+
+    [MenuItem("Tools/yum_food/GenerateMetallicGlossMap")]
+    public static void ShowWindow()
+    {
+        GetWindow<GenerateMetallicGlossMap>("Metallic Gloss Map Generator");
+    }
+
+    private void OnGUI()
+    {
+        GUILayout.Label("Metallic Gloss Map Generator", EditorStyles.boldLabel);
+
+        metallicMap = (Texture2D)EditorGUILayout.ObjectField(
+            "Metallic Map (R)", metallicMap, typeof(Texture2D), false);
+        smoothnessMap = (Texture2D)EditorGUILayout.ObjectField(
+            "Smoothness Map (R)", smoothnessMap, typeof(Texture2D), false);
+        
+        invertSmoothness = EditorGUILayout.Toggle("Invert Smoothness", invertSmoothness);
+
+        if (GUILayout.Button("Generate Metallic Gloss Map") && metallicMap != null && smoothnessMap != null)
+        {
+            GenerateMap();
+        }
+    }
+
+    private void GenerateMap()
+    {
+        // Get path of metallic map
+        string path = AssetDatabase.GetAssetPath(metallicMap);
+        string directory = Path.GetDirectoryName(path);
+        string newPath = Path.Combine(directory, metallicMap.name + "_metallicgloss.png");
+
+        // Create new texture
+        int width = metallicMap.width;
+        int height = metallicMap.height;
+        Texture2D combinedTexture = new Texture2D(width, height, TextureFormat.RGBA32, false);
+
+        // Make the texture readable
+        TextureImporter metallicImporter = AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(metallicMap)) as TextureImporter;
+        TextureImporter smoothnessImporter = AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(smoothnessMap)) as TextureImporter;
+
+        bool metallicReadable = metallicImporter.isReadable;
+        bool smoothnessReadable = smoothnessImporter.isReadable;
+
+        metallicImporter.isReadable = true;
+        smoothnessImporter.isReadable = true;
+
+        AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(metallicMap));
+        AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(smoothnessMap));
+
+        // Get pixels
+        Color[] metallicPixels = metallicMap.GetPixels();
+        Color[] smoothnessPixels = smoothnessMap.GetPixels();
+        Color[] newPixels = new Color[metallicPixels.Length];
+
+        // Combine channels (R from metallic, A from smoothness)
+        for (int i = 0; i < metallicPixels.Length; i++)
+        {
+            float smoothness = invertSmoothness ? 1 - smoothnessPixels[i].r : smoothnessPixels[i].r;
+            newPixels[i] = new Color(
+                metallicPixels[i].r,    // Metallic in R
+                0,                      // Empty G
+                0,                      // Empty B
+                smoothness              // Smoothness in A (inverted if flag is set)
+            );
+        }
+
+        // Apply pixels and save
+        combinedTexture.SetPixels(newPixels);
+        combinedTexture.Apply();
+
+        // Encode and save
+        byte[] bytes = combinedTexture.EncodeToPNG();
+        File.WriteAllBytes(newPath, bytes);
+
+        // Restore original import settings
+        metallicImporter.isReadable = metallicReadable;
+        smoothnessImporter.isReadable = smoothnessReadable;
+
+        AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(metallicMap));
+        AssetDatabase.ImportAsset(AssetDatabase.GetAssetPath(smoothnessMap));
+        AssetDatabase.ImportAsset(newPath);
+
+        Debug.Log("Generated metallic gloss map at: " + newPath);
+    }
+}
-- 
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