lookdev: Add material-from-texture generator.

Author: freezy

LookDev~/Assets/Editor/MaterialFromTextures.cs

@@ -0,0 +1,136 @@
+// MaterialFromTextures.cs
+// Place this script inside an "Editor" folder in a Unity project running **HDRP**.
+// Adds **Assets ▸ Create ▸ Generate HDRP Materials From Selection** to the Project View
+// whenever one or more **Texture2D** assets are selected. It converts those textures
+// into HDRP/Lit materials based on suffixes:
+//   <BaseName>_BaseMap.<ext>  (required)
+//   <BaseName>_MaskMap.<ext>  (optional)
+//   <BaseName>_Normal.<ext>   (optional)
+// The resulting material **<BaseName>.mat** is written next to its BaseMap texture.
+
+using UnityEditor;
+using UnityEngine;
+using System.IO;
+using System.Collections.Generic;
+
+namespace EditorTools
+{
+	public static class MaterialFromTextures
+	{
+		private const string BaseSuffix = "BaseMap";
+		private const string MaskSuffix = "MaskMap";
+		private const string NormalSuffix = "Normal";
+
+		//------------------------------------------------------------------
+		// Menu item
+		//------------------------------------------------------------------
+		[MenuItem("Assets/Create/Generate HDRP Materials From Selection", priority = 2050)]
+		private static void Generate()
+		{
+			var selectedTextures = Selection.GetFiltered<Texture2D>(SelectionMode.Assets);
+			if (selectedTextures.Length == 0) {
+				EditorUtility.DisplayDialog("Generate HDRP Materials", "Select one or more texture assets first.", "OK");
+				return;
+			}
+
+			// Build groups keyed by base name (local dictionary)
+			var groups = new Dictionary<string, MaterialTextures>();
+
+			foreach (var tex in selectedTextures) {
+				var path = AssetDatabase.GetAssetPath(tex);
+				var fileName = Path.GetFileNameWithoutExtension(path);
+
+				AddTextureToGroup(fileName, tex, path, BaseSuffix, groups, (g, t) => g.baseMap = t, (g, p) => g.baseFolder = Path.GetDirectoryName(p));
+				AddTextureToGroup(fileName, tex, path, MaskSuffix, groups, (g, t) => g.maskMap = t);
+				AddTextureToGroup(fileName, tex, path, NormalSuffix, groups, (g, t) => g.normalMap = t);
+			}
+
+			var hdrpShader = Shader.Find("HDRP/Lit");
+			if (hdrpShader == null) {
+				EditorUtility.DisplayDialog("Generate HDRP Materials", "Shader 'HDRP/Lit' not found. Is HDRP installed?", "OK");
+				return;
+			}
+
+			var created = 0;
+			foreach (var kvp in groups) {
+
+				var baseName = kvp.Key;
+				var maps = kvp.Value;
+				if (maps.baseMap == null || string.IsNullOrEmpty(maps.baseFolder)) {
+					continue; // Need at least a BaseMap and its location
+				}
+
+				var matPath = Path.Combine(maps.baseFolder, baseName + ".mat").Replace("\\", "/");
+				var mat = AssetDatabase.LoadAssetAtPath<Material>(matPath);
+				var isNew = mat == null;
+
+				if (isNew) {
+					mat = new Material(hdrpShader);
+					AssetDatabase.CreateAsset(mat, matPath);
+					created++;
+				}
+
+				AssignHDRPTextures(mat, maps);
+				EditorUtility.SetDirty(mat);
+			}
+
+			AssetDatabase.SaveAssets();
+			AssetDatabase.Refresh();
+			EditorUtility.DisplayDialog("Generate HDRP Materials", $"Created/updated {created} material(s).", "OK");
+		}
+
+		//------------------------------------------------------------------
+		// Validation – show the menu item only when textures are selected
+		//------------------------------------------------------------------
+		[MenuItem("Assets/Create/Generate HDRP Materials From Selection", validate = true)]
+		private static bool ValidateGenerate() => Selection.GetFiltered<Texture2D>(SelectionMode.Assets).Length > 0;
+
+		//------------------------------------------------------------------
+		// Helpers
+		//------------------------------------------------------------------
+		private static void AddTextureToGroup(string fileName,
+			Texture2D tex,
+			string path,
+			string suffix,
+			Dictionary<string, MaterialTextures> groups,
+			System.Action<MaterialTextures, Texture2D> texSetter,
+			System.Action<MaterialTextures, string> folderSetter = null)
+		{
+			if (!fileName.EndsWith(suffix)) return;
+
+			var baseName = TrimSuffix(fileName, suffix);
+			var group = GetOrCreateGroup(groups, baseName);
+
+			texSetter(group, tex);
+			folderSetter?.Invoke(group, path);
+		}
+
+		private static string TrimSuffix(string name, string suffix) => name[..^suffix.Length].TrimEnd('_', ' ', '-');
+
+		private class MaterialTextures
+		{
+			public Texture2D baseMap;
+			public Texture2D maskMap;
+			public Texture2D normalMap;
+			public string baseFolder;
+		}
+
+		private static MaterialTextures GetOrCreateGroup(Dictionary<string, MaterialTextures> dict, string baseName)
+		{
+			if (!dict.TryGetValue(baseName, out var g)) {
+				g = new MaterialTextures();
+				dict[baseName] = g;
+			}
+
+			return g;
+		}
+
+		// Assign maps to an HDRP/Lit material
+		private static void AssignHDRPTextures(Material mat, MaterialTextures m)
+		{
+			if (m.baseMap && mat.HasProperty("_BaseColorMap")) mat.SetTexture("_BaseColorMap", m.baseMap);
+			if (m.maskMap && mat.HasProperty("_MaskMap")) mat.SetTexture("_MaskMap", m.maskMap);
+			if (m.normalMap && mat.HasProperty("_NormalMap")) mat.SetTexture("_NormalMap", m.normalMap);
+		}
+	}
+}