diff --git a/src/ingamescene.cpp b/src/ingamescene.cpp
index 1c746cd..ee23994 100644
--- a/src/ingamescene.cpp
+++ b/src/ingamescene.cpp
@@ -3,6 +3,9 @@
 #include "mycurryConfig.h"
 #include "key.hpp"
 #include "inputbag.hpp"
+#include "worldgrid.hpp"
+#include "worldviewport.hpp"
+#include "texture.hpp"
 #include <SDL2/SDL.h>
 #include <algorithm>
 
@@ -26,15 +29,25 @@ namespace curry {
 		}
 	} //unnamed namespace
 
+	struct IngameScene::LocalData {
+		LocalData (const vec2us& parTileSize, const vec2us& parTileCount, cloonel::SDLMain* parSDLMain) :
+			world(parTileSize, parTileCount),
+			viewport(&world, vec2i(parSDLMain->WidthHeight()))
+		{
+		}
+
+		WorldGrid world;
+		WorldViewport viewport;
+		Texture worldtiles;
+	};
+
 	IngameScene::IngameScene (cloonel::SDLMain* parSDLMain) :
 		GameSceneBase(parSDLMain),
-		m_world(vec2us(96), vec2us(100)),
-		m_viewport(&m_world, vec2i(parSDLMain->WidthHeight()))
+		m_local_data(std::make_unique<LocalData>(vec2us(96), vec2us(100), parSDLMain))
 	{
 		using cloonel::Key;
 		using cloonel::InputDevice_Keyboard;
 
-		//m_viewport.set_position(vec2i(38));
 		auto& inp = this->input_bag();
 		inp.AddAction(ActionLeft, Key(InputDevice_Keyboard, SDL_SCANCODE_LEFT), "Move left");
 		inp.AddAction(ActionUp, Key(InputDevice_Keyboard, SDL_SCANCODE_UP), "Move up");
@@ -45,27 +58,29 @@ namespace curry {
 	IngameScene::~IngameScene() noexcept = default;
 
 	void IngameScene::on_prepare() {
-		m_worldtiles.load(RESOURCES_PATH "textures.png", *this->sdl_main());
+		m_local_data->worldtiles.load(RESOURCES_PATH "textures.png", *this->sdl_main());
 	}
 
 	void IngameScene::on_update (float parDeltaT) {
+		const auto& world = m_local_data->world;
 		const float speed_per_sec =
 			static_cast<float>(
-				std::max(m_world.tile_size().x(), m_world.tile_size().y())
+				std::max(world.tile_size().x(), world.tile_size().y())
 			) * 1.5f;
 
+		auto& viewport = m_local_data->viewport;
 		const float speed = parDeltaT * speed_per_sec;
 		if (cloonel::IsPressed(input_bag(), ActionRight))
-			m_viewport.set_position(m_viewport.position() + vec2f(speed, 0));
+			viewport.set_position(viewport.position() + vec2f(speed, 0));
 		if (cloonel::IsPressed(input_bag(), ActionLeft))
-			m_viewport.set_position(m_viewport.position() - vec2f(speed, 0));
+			viewport.set_position(viewport.position() - vec2f(speed, 0));
 		if (cloonel::IsPressed(input_bag(), ActionUp))
-			m_viewport.set_position(m_viewport.position() - vec2f(0, speed));
+			viewport.set_position(viewport.position() - vec2f(0, speed));
 		if (cloonel::IsPressed(input_bag(), ActionDown))
-			m_viewport.set_position(m_viewport.position() + vec2f(0, speed));
+			viewport.set_position(viewport.position() + vec2f(0, speed));
 
-		const auto tilesize(m_world.tile_size());
-		for (auto tile : m_viewport) {
+		const auto tilesize(world.tile_size());
+		for (auto tile : viewport) {
 			vec2us idx(tile.index & 1, (tile.index >> 1) & 1);
 			vec2us src_rect_xy = idx * tilesize;
 
@@ -73,12 +88,12 @@ namespace curry {
 			SDL_Rect src{src_rect_xy.x(), src_rect_xy.y(), tilesize.x(), tilesize.y()};
 			SDL_Rect dst{tile.pixel_pos.x(), tile.pixel_pos.y(), tilesize.x(), tilesize.y()};
 			clip(src, dst, vec2i(0), sdl_main()->WidthHeight());
-			SDL_RenderCopy(this->sdl_main()->GetRenderer(), m_worldtiles.texture(), &src, &dst);
+			SDL_RenderCopy(this->sdl_main()->GetRenderer(), m_local_data->worldtiles.texture(), &src, &dst);
 		}
 		SDL_RenderPresent(this->sdl_main()->GetRenderer());
 	}
 
 	void IngameScene::on_destroy() noexcept {
-		m_worldtiles.unload();
+		m_local_data->worldtiles.unload();
 	}
 } //namespace curry
diff --git a/src/ingamescene.hpp b/src/ingamescene.hpp
index c41cef4..e668e94 100644
--- a/src/ingamescene.hpp
+++ b/src/ingamescene.hpp
@@ -1,9 +1,7 @@
 #pragma once
 
 #include "gamescenebase.hpp"
-#include "worldgrid.hpp"
-#include "worldviewport.hpp"
-#include "texture.hpp"
+#include <memory>
 
 namespace cloonel {
 	class SDLMain;
@@ -21,8 +19,8 @@ namespace curry {
 		virtual void on_update (float parDeltaT) override;
 
 	private:
-		WorldGrid m_world;
-		WorldViewport m_viewport;
-		Texture m_worldtiles;
+		struct LocalData;
+
+		std::unique_ptr<LocalData> m_local_data;
 	};
 } //namespace curry