Added GenerateMask to AssetsHelpers;

Editor/AssetsHelpers/Implementation/Material/CreateDecal/CreateDecalMenu.cs

@@ -0,0 +1,33 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace Misaki.ArtToolEditor
+{
+    internal class CreateDecalMenu
+    {
+        [MenuItem("Assets/Art Tools/Material Helpers/Create Decal", true)]
+        public static bool CreateDecalValidator()
+        {
+            foreach (var selectedObject in Selection.objects)
+            {
+                if (selectedObject is not Material)
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        [MenuItem("Assets/Art Tools/Material Helpers/Create Decal")]
+        public static void CreateDecal()
+        {
+            var createDecal = new CreateDecalMenu();
+            var window = EditorWindow.GetWindow<OutputOptionsWindow>(true, "Decal Output Options");
+            window.WithItemSource(Selection.objects);
+            window.RegisterProcessor<CreateDecalProcessor>();
+
+            window.InitializeAndShow();
+        }
+    }
+}

Editor/AssetsHelpers/Implementation/Material/CreateDecal/CreateDecalMenu.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a4585b41cdb0577478ac9c4e563dc639

Editor/AssetsHelpers/Implementation/Material/CreateDecal/CreateDecalProcessor.cs

@@ -0,0 +1,32 @@
+using System.IO;
+using UnityEngine;
+using UnityEngine.Rendering.HighDefinition;
+
+namespace Misaki.ArtToolEditor
+{
+    internal class CreateDecalProcessor : IAssetsProcessor
+    {
+        public void OnPreProcess(AssetsProcessContext context)
+        {
+        }
+
+        public void OnProcess(UnityEngine.Object source, string outputDirectory, AssetsProcessContext context)
+        {
+            if (source is not Material mat)
+            {
+                return;
+            }
+
+            var outputPath = Path.Combine(outputDirectory, mat.name + ".prefab");
+            var decal = AssetCreationHelpers.CreateDecal(outputPath);
+
+            mat.shader = Shader.Find(Constants.Shader.DECAL_SHADER_PATH);
+            decal.transform.rotation = Quaternion.Euler(90, 0, 0);
+            decal.GetComponent<DecalProjector>().material = mat;
+        }
+
+        public void OnPostProcess(AssetsProcessContext context)
+        {
+        }
+    }
+}

Editor/AssetsHelpers/Implementation/Material/CreateDecal/CreateDecalProcessor.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 94792199a8319cd46b91c5b746992046