diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index b75e802..875a08c 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -2,6 +2,8 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/cmake-build-debug/_deps/catch2-src" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/cmake-build-debug/_deps/spdlog-src" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/lib/glfw" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/lib/glm" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/lib/tinyobjloader" vcs="Git" />
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f961bb..96c84ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,7 +49,7 @@ FetchContent_Declare(
 
 FetchContent_MakeAvailable(Catch2 spdlog)
 
-target_link_libraries(LayoutEngineTests PRIVATE Catch2::Catch2WithMain spdlog::spdlog)
+target_link_libraries(LayoutEngineTests PRIVATE Catch2::Catch2WithMain spdlog::spdlog_header_only)
 
 include(CTest)
 include(Catch)
@@ -311,6 +311,8 @@ if(BUILD_GAME)
             src/engine/renderer/loader/async/AssetLoader.cpp
             src/engine/renderer/loader/async/AssetLoader.h
             src/engine/renderer/loader/async/AssetLoadingProgressEvent.h
+            src/engine/core/scenes/Scene.cpp
+            src/engine/core/scenes/Scene.h
     )
     target_compile_options(Dicewars_Siedler PRIVATE
             -Wall
@@ -334,7 +336,7 @@ if(BUILD_GAME)
             glad
             OpenGL::GL
             ${FREETYPE_LIBRARIES}
-            spdlog::spdlog
+            spdlog::spdlog_header_only
     )
 endif()
 
diff --git a/src/engine/renderer/loader/OBJLoader.cpp b/src/engine/renderer/loader/OBJLoader.cpp
index 8cbc9ff..0412dd5 100644
--- a/src/engine/renderer/loader/OBJLoader.cpp
+++ b/src/engine/renderer/loader/OBJLoader.cpp
@@ -159,7 +159,7 @@ RawModelData OBJLoader::loadModel(const std::string &modelPath) {
     return {"", subModels};
 }
 
-TexturedModel OBJLoader::uploadToGPU(RawModelData &rawModelData) {
+TexturedModel OBJLoader::uploadToGPU(const RawModelData &rawModelData) {
     Loader loader = Loader::instance();
 
     std::vector<SubModel> subModels;
diff --git a/src/engine/renderer/loader/OBJLoader.h b/src/engine/renderer/loader/OBJLoader.h
index 2b4134d..d075502 100644
--- a/src/engine/renderer/loader/OBJLoader.h
+++ b/src/engine/renderer/loader/OBJLoader.h
@@ -16,7 +16,7 @@ class OBJLoader {
 public:
     static std::shared_ptr<TexturedModel> loadModel(const std::string &modelPath, const std::string &texturePath, Loader &loader);
     static RawModelData loadModel(const std::string &modelPath);
-    static TexturedModel uploadToGPU(RawModelData &rawModelData);
+    static TexturedModel uploadToGPU(const RawModelData &rawModelData);
 };
 
 
diff --git a/src/engine/renderer/loader/TextureLoader.cpp b/src/engine/renderer/loader/TextureLoader.cpp
index ba45e1c..5f3c6f0 100644
--- a/src/engine/renderer/loader/TextureLoader.cpp
+++ b/src/engine/renderer/loader/TextureLoader.cpp
@@ -86,9 +86,8 @@ TextureData TextureLoader::loadTextureData(const std::string &path, bool flipVer
     return textureData;
 }
 
-Texture2D TextureLoader::uploadToGPU(RawTextureData &rawTextureData) {
+Texture2D TextureLoader::uploadToGPU(const RawTextureData &rawTextureData) {
     Texture2D texture;
-    texture.pixels = rawTextureData.pixels.data();
     texture.width = rawTextureData.width;
     texture.height = rawTextureData.height;
     texture.channels = rawTextureData.channels;
@@ -119,7 +118,7 @@ Texture2D TextureLoader::uploadToGPU(RawTextureData &rawTextureData) {
         0,
         format,
         GL_UNSIGNED_BYTE,
-        texture.pixels
+        rawTextureData.pixels.data()
     );
 
     glGenerateMipmap(GL_TEXTURE_2D);
diff --git a/src/engine/renderer/loader/TextureLoader.h b/src/engine/renderer/loader/TextureLoader.h
index e34ef00..ee2b918 100644
--- a/src/engine/renderer/loader/TextureLoader.h
+++ b/src/engine/renderer/loader/TextureLoader.h
@@ -17,8 +17,8 @@ class TextureLoader {
 public:
     static Texture2D loadTexture(const std::string& path, bool flipVertically= true);
     static RawTextureData loadRawTextureData(const std::string &path, bool flipVertically = true);
-    static TextureData loadTextureData(const std::string &path, bool flipVertically = true, TextureType textureType);
-    static Texture2D uploadToGPU(RawTextureData &rawTextureData);
+    static TextureData loadTextureData(const std::string &path, bool flipVertically = true, TextureType textureType = TextureType::Diffuse);
+    static Texture2D uploadToGPU(const RawTextureData &rawTextureData);
     static Texture2D uploadToGPU(TextureData& textureData);
     static void free(Texture2D& texture);
 };
diff --git a/src/engine/renderer/loader/async/AssetLoader.cpp b/src/engine/renderer/loader/async/AssetLoader.cpp
index 28f35e0..d1dc4c2 100644
--- a/src/engine/renderer/loader/async/AssetLoader.cpp
+++ b/src/engine/renderer/loader/async/AssetLoader.cpp
@@ -147,14 +147,14 @@ nlohmann::json AssetLoader::loadJson(const std::string &path) {
 void AssetLoader::processUploadQueue(int maxPerFrame) {
     auto uploadQueue = determineUploadQueue(maxPerFrame);
     for (const auto& intermediateAsset : uploadQueue) {
-        std::visit([]<typename T0>(T0& rawData) -> IntermediateAsset {
+        std::visit([]<typename T0>(const T0& rawData) -> void {
              using T = std::decay_t<T0>;
              if constexpr (std::is_same_v<T, RawTextureData>) {
-                 return processIntermediateTextureAsset(rawData);
+                 processIntermediateTextureAsset(rawData);
              } else if constexpr (std::is_same_v<T, RawModelData>) {
-                 return processIntermediateModelAsset(rawData);
+                 processIntermediateModelAsset(rawData);
              } else {
-                 return processIntermediateStagedModelAsset(rawData);
+                 processIntermediateStagedModelAsset(rawData);
              }
          }, intermediateAsset);
         ++loaded;
@@ -175,12 +175,12 @@ std::vector<IntermediateAsset> AssetLoader::determineUploadQueue(const int maxPe
     return results;
 }
 
-void AssetLoader::processIntermediateTextureAsset(RawTextureData &textureData) {
+void AssetLoader::processIntermediateTextureAsset(const RawTextureData &textureData) {
     const Texture2D texture = TextureLoader::uploadToGPU(textureData);
     AssetManager::insertLoadedTexture(textureData.name, texture);
 }
 
-void AssetLoader::processIntermediateModelAsset(RawModelData &modelData) {
+void AssetLoader::processIntermediateModelAsset(const RawModelData &modelData) {
     const TexturedModel texturedModel = OBJLoader::uploadToGPU(modelData);
     AssetManager::insertTexturedModel(modelData.name, texturedModel);
 }
diff --git a/src/engine/renderer/loader/async/AssetLoader.h b/src/engine/renderer/loader/async/AssetLoader.h
index d430bd9..a7448e0 100644
--- a/src/engine/renderer/loader/async/AssetLoader.h
+++ b/src/engine/renderer/loader/async/AssetLoader.h
@@ -72,8 +72,8 @@ private:
     static nlohmann::json loadJson(const std::string& path);
     std::vector<IntermediateAsset> determineUploadQueue(int maxPerFrame);
 
-    static void processIntermediateTextureAsset(RawTextureData &textureData);
-    static void processIntermediateModelAsset(RawModelData &modelData);
+    static void processIntermediateTextureAsset(const RawTextureData &textureData);
+    static void processIntermediateModelAsset(const RawModelData &modelData);
     static void processIntermediateStagedModelAsset(const RawStagedModelData &stagedModelData);
 
     // Render-Thread schreibt, Loading Thread liest
diff --git a/src/game/DicewarsApp.cpp b/src/game/DicewarsApp.cpp
index f9aca08..c851281 100644
--- a/src/game/DicewarsApp.cpp
+++ b/src/game/DicewarsApp.cpp
@@ -8,11 +8,5 @@
 #include "UILayer.h"
 
 DicewarsApp::DicewarsApp() {
-    gameMode = std::make_shared<GameMode>();
-    GameLayer* gamelayer = new GameLayer();
-    gamelayer->setGameMode(gameMode);
-    pushLayer(gamelayer);
-    UILayer* uiLayer = new UILayer();
-    uiLayer->setGameMode(gameMode);
-    pushLayer(uiLayer);
+
 }
diff --git a/src/game/DicewarsApp.h b/src/game/DicewarsApp.h
index 53d97b9..079133b 100644
--- a/src/game/DicewarsApp.h
+++ b/src/game/DicewarsApp.h
@@ -11,8 +11,6 @@
 
 class DicewarsApp: public Application
 {
-private:
-    std::shared_ptr<GameMode> gameMode;
 public:
     DicewarsApp();
 };
diff --git a/src/main.cpp b/src/main.cpp
index 617294e..be06024 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2,7 +2,7 @@
 
 #include "engine/core/Application.h"
 #include "game/DicewarsApp.h"
-#include "spdlog/spdlog-inl.h"
+#include "spdlog/spdlog.h"  // ← nur das
 // TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
 
 Application* CreateApplication()