Make decorations lit, Rename unlit_decor material to decor.

PiperOrigin-RevId: 933693797
Change-Id: I37128b528296d978d4917ec65316d8d99ce017bb

src/experimental/studio/live.js

@@ -162,7 +162,7 @@ var Module = {
       "assets/outline_composite.filamat",
       "assets/outline_flatten.filamat",
       "assets/outline_jumpflood.filamat",
-      "assets/unlit_decor.filamat",
+      "assets/decor.filamat",
       "assets/unlit_depth.filamat",
       "assets/unlit_segmentation.filamat",
       "assets/unlit_ui.filamat"

src/render/filament/CMakeLists.txt

@@ -112,7 +112,7 @@ set(MATERIAL_FILES
     outline_composite.mat
     outline_flatten.mat
     outline_jumpflood.mat
-    unlit_decor.mat
+    decor.mat
     unlit_depth.mat
     unlit_segmentation.mat
     unlit_ui.mat

src/render/filament/assets/decor.mat

@@ -1,4 +1,4 @@
-// Copyright 2025 DeepMind Technologies Limited
+// Copyright 2026 DeepMind Technologies Limited
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -13,16 +13,19 @@
 // limitations under the License.
 
 material {
-    name : unlit_decor,
-    shadingModel : unlit,
+    name : decor,
+    shadingModel : specularGlossiness,
     parameters : [
         { type : float4, name : BaseColorFactor }
     ]
 }
 
 fragment {
-    void material(inout MaterialInputs material) {
-      prepareMaterial(material);
-      material.baseColor = materialParams.BaseColorFactor;
-    }
+  void material(inout MaterialInputs material) {
+    prepareMaterial(material);
+    material.baseColor     = materialParams.BaseColorFactor;
+    material.specularColor = vec3(0.0);
+    material.glossiness    = 0.0;
+    material.emissive      = vec4(0.0);
+  }
 }

src/render/filament/core/material_manager.cc

@@ -111,7 +111,7 @@ MaterialManager::MaterialType MaterialManager::GetMaterialType(
     if (material.color_texture) {
       return ObjectManager::kUnlitUi;
     } else {
-      return ObjectManager::kUnlitDecor;
+      return ObjectManager::kDecor;
     }
   } else if (material.orm_texture) {
     if (material.opacity_texture) {

src/render/filament/core/object_manager.cc

@@ -76,7 +76,7 @@ ObjectManager::ObjectManager(filament::Engine* engine) : engine_(engine) {
       LoadMaterial(engine, "phong_cube_reflect.filamat");
   materials_[kUnlitSegmentation] =
       LoadMaterial(engine, "unlit_segmentation.filamat");
-  materials_[kUnlitDecor] = LoadMaterial(engine, "unlit_decor.filamat");
+  materials_[kDecor] = LoadMaterial(engine, "decor.filamat");
   materials_[kUnlitDepth] = LoadMaterial(engine, "unlit_depth.filamat");
   materials_[kUnlitUi] = LoadMaterial(engine, "unlit_ui.filamat");
   materials_[kOutlineComposite] =

src/render/filament/core/object_manager.h

@@ -57,7 +57,7 @@ class ObjectManager {
     kPhongCubeFade,
     kPhongCubeReflect,
     kUnlitSegmentation,
-    kUnlitDecor,
+    kDecor,
     kUnlitDepth,
     kUnlitUi,
     kOutlineComposite,