diff --git a/res/scripts/stdlib.lua b/res/scripts/stdlib.lua
new file mode 100644
index 00000000..35927573
--- /dev/null
+++ b/res/scripts/stdlib.lua
@@ -0,0 +1,51 @@
+-- kit of standard functions
+
+-- Check if given table is an array
+function is_array(x)
+    if #t > 0 then
+        return true
+    end
+    for k, v in pairs(x) do
+        return false
+    end
+    return true
+end
+
+local __cached_scripts = {}
+local __cached_results = {}
+
+-- Get entry-point and filename from `entry-point:filename` path 
+function parse_path(path)
+    local index = string.find(path, ':')
+    if index == nil then
+        error("invalid path syntax (':' missing)")
+    end
+    return string.sub(path, 1, index-1), string.sub(path, index+1, -1)
+end
+
+-- Load script with caching
+--
+-- path - script path `contentpack:filename`. 
+--     Example `base:scripts/tests.lua`
+--
+-- nocache - ignore cached script, load anyway
+function load_script(path, nocache)
+    local packname, filename = parse_path(path)
+    local packpath = pack.get_folder(packname)
+    local fullpath = packpath..filename
+
+    -- __cached_scripts used in condition because cached result may be nil
+    if not nocache and __cached_scripts[fullpath] ~= nil then
+        return __cached_results[fullpath]
+    end
+    local script = loadfile(fullpath)
+    if script == nil then
+        error("script '"..filename.."' not found in '"..packname.."'")
+    end
+    local result = script()
+    if not nocache then
+        __cached_scripts[fullpath] = script
+        __cached_results[fullpath] = result
+    end
+    return result
+end
diff --git a/src/constants.h b/src/constants.h
index dd5e56e0..f9cc1d4b 100644
--- a/src/constants.h
+++ b/src/constants.h
@@ -17,6 +17,8 @@ const int CHUNK_D = 16;
 const uint VOXEL_USER_BITS = 8;
 constexpr uint VOXEL_USER_BITS_OFFSET = sizeof(blockstate_t)*8-VOXEL_USER_BITS;
 
+const int ITEM_ICON_SIZE = 48;
+
 /* Chunk volume (count of voxels per Chunk) */
 constexpr int CHUNK_VOL = (CHUNK_W * CHUNK_H * CHUNK_D);
 
diff --git a/src/files/WorldFiles.cpp b/src/files/WorldFiles.cpp
index 6fd51b84..f9db0c02 100644
--- a/src/files/WorldFiles.cpp
+++ b/src/files/WorldFiles.cpp
@@ -17,6 +17,7 @@
 #include "../coders/json.h"
 #include "../constants.h"
 #include "../items/ItemDef.h"
+#include "../items/Inventory.h"
 
 #include "../data/dynamic.h"
 
@@ -488,12 +489,13 @@ void WorldFiles::writeWorldInfo(const World* world) {
 	versionobj.put("major", ENGINE_VERSION_MAJOR);
 	versionobj.put("minor", ENGINE_VERSION_MINOR);
 
-	root.put("name", world->name);
-	root.put("seed", world->seed);
+	root.put("name", world->getName());
+	root.put("seed", world->getSeed());
 	
     auto& timeobj = root.putMap("time");
 	timeobj.put("day-time", world->daytime);
 	timeobj.put("day-time-speed", world->daytimeSpeed);
+    timeobj.put("total-time", world->totalTime);
 
 	files::write_json(getWorldFile(), &root);
 }
@@ -506,8 +508,9 @@ bool WorldFiles::readWorldInfo(World* world) {
 	}
 
 	auto root = files::read_json(file);
-	root->str("name", world->name);
-	root->num("seed", world->seed);
+    
+    world->setName(root->getStr("name", world->getName()));
+    world->setSeed(root->getInt("seed", world->getSeed()));
 
 	auto verobj = root->map("version");
 	if (verobj) {
@@ -521,12 +524,13 @@ bool WorldFiles::readWorldInfo(World* world) {
 	if (timeobj) {
 		timeobj->num("day-time", world->daytime);
 		timeobj->num("day-time-speed", world->daytimeSpeed);
+        timeobj->num("total-time", world->totalTime);
 	}
 
 	return true;
 }
 
-void WorldFiles::writePlayer(Player* player){
+void WorldFiles::writePlayer(Player* player) {
 	glm::vec3 position = player->hitbox->position;
 	dynamic::Map root;
 	auto& posarr = root.putList("position");
@@ -540,6 +544,8 @@ void WorldFiles::writePlayer(Player* player){
 	
 	root.put("flight", player->flight);
 	root.put("noclip", player->noclip);
+    root.put("chosen-slot", player->getChosenSlot());
+    root.put("inventory", player->getInventory()->write().release());
 
 	files::write_json(getPlayerFile(), &root);
 }
@@ -565,5 +571,11 @@ bool WorldFiles::readPlayer(Player* player) {
 
 	root->flag("flight", player->flight);
 	root->flag("noclip", player->noclip);
+    player->setChosenSlot(root->getInt("chosen-slot", player->getChosenSlot()));
+
+    auto invmap = root->map("inventory");
+    if (invmap) {
+        player->getInventory()->read(invmap);
+    }
 	return true;
 }
diff --git a/src/files/files.cpp b/src/files/files.cpp
index 8f459dcc..55ca345f 100644
--- a/src/files/files.cpp
+++ b/src/files/files.cpp
@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <stdexcept>
 #include "../coders/json.h"
+#include "../coders/gzip.h"
 #include "../util/stringutil.h"
 #include "../data/dynamic.h"
 
@@ -32,21 +33,21 @@ void files::rafile::read(char* buffer, std::streamsize size) {
     file.read(buffer, size);
 }
 
-bool files::write_bytes(fs::path filename, const char* data, size_t size) {
+bool files::write_bytes(fs::path filename, const ubyte* data, size_t size) {
 	std::ofstream output(filename, std::ios::binary);
 	if (!output.is_open())
 		return false;
-	output.write(data, size);
+	output.write((const char*)data, size);
 	output.close();
 	return true;
 }
 
-uint files::append_bytes(fs::path filename, const char* data, size_t size) {
+uint files::append_bytes(fs::path filename, const ubyte* data, size_t size) {
 	std::ofstream output(filename, std::ios::binary | std::ios::app);
 	if (!output.is_open())
 		return 0;
 	uint position = output.tellp();
-	output.write(data, size);
+	output.write((const char*)data, size);
 	output.close();
 	return position;
 }
@@ -60,7 +61,7 @@ bool files::read(fs::path filename, char* data, size_t size) {
 	return true;
 }
 
-char* files::read_bytes(fs::path filename, size_t& length) {
+ubyte* files::read_bytes(fs::path filename, size_t& length) {
 	std::ifstream input(filename, std::ios::binary);
 	if (!input.is_open())
 		return nullptr;
@@ -71,17 +72,17 @@ char* files::read_bytes(fs::path filename, size_t& length) {
 	std::unique_ptr<char> data(new char[length]);
 	input.read(data.get(), length);
 	input.close();
-	return data.release();
+	return (ubyte*)data.release();
 }
 
 std::string files::read_string(fs::path filename) {
 	size_t size;
-	std::unique_ptr<char> chars (read_bytes(filename, size));
-	if (chars == nullptr) {
+	std::unique_ptr<ubyte[]> bytes (read_bytes(filename, size));
+	if (bytes == nullptr) {
 		throw std::runtime_error("could not to load file '"+
 								 filename.string()+"'");
 	}
-	return std::string(chars.get(), size);
+	return std::string((const char*)bytes.get(), size);
 }
 
 bool files::write_string(fs::path filename, const std::string content) {
@@ -94,27 +95,21 @@ bool files::write_string(fs::path filename, const std::string content) {
 }
 
 bool files::write_json(fs::path filename, const dynamic::Map* obj, bool nice) {
-    // -- binary json tests
-    //return write_binary_json(fs::path(filename.u8string()+".bin"), obj);
     return files::write_string(filename, json::stringify(obj, nice, "  "));
 }
 
-bool files::write_binary_json(fs::path filename, const dynamic::Map* obj) {
-    std::vector<ubyte> bytes = json::to_binary(obj);
-    return files::write_bytes(filename, (const char*)bytes.data(), bytes.size());
+bool files::write_binary_json(fs::path filename, const dynamic::Map* obj, bool compression) {
+    auto bytes = json::to_binary(obj);
+    if (compression) {
+        bytes = gzip::compress(bytes.data(), bytes.size());
+    }
+    return files::write_bytes(filename, bytes.data(), bytes.size());
 }
 
 std::unique_ptr<dynamic::Map> files::read_json(fs::path filename) {
-    // binary json tests
-    // fs::path binfile = fs::path(filename.u8string()+".bin");
-    // if (fs::is_regular_file(binfile)){
-    //     return read_binary_json(binfile);
-    // }
-
 	std::string text = files::read_string(filename);
 	try {
 		auto obj = json::parse(filename.string(), text);
-        //write_binary_json(binfile, obj);
         return obj;
 	} catch (const parsing_error& error) {
         std::cerr << error.errorLog() << std::endl;
@@ -124,8 +119,10 @@ std::unique_ptr<dynamic::Map> files::read_json(fs::path filename) {
 
 std::unique_ptr<dynamic::Map> files::read_binary_json(fs::path file) {
     size_t size;
-    std::unique_ptr<char[]> bytes (files::read_bytes(file, size));
-    return std::unique_ptr<dynamic::Map>(json::from_binary((const ubyte*)bytes.get(), size));
+    std::unique_ptr<ubyte[]> bytes (files::read_bytes(file, size));
+    return std::unique_ptr<dynamic::Map>(
+        json::from_binary(bytes.get(), size)
+    );
 }
 
 std::vector<std::string> files::read_list(fs::path filename) {
diff --git a/src/files/files.h b/src/files/files.h
index 4e136fa6..f7515712 100644
--- a/src/files/files.h
+++ b/src/files/files.h
@@ -27,15 +27,33 @@ namespace files {
         size_t length() const;
     };
 
+    /* Write bytes array to the file without any extra data */
+    extern bool write_bytes(fs::path, const ubyte* data, size_t size);
 
-    extern bool write_bytes(fs::path, const char* data, size_t size);
-    extern uint append_bytes(fs::path, const char* data, size_t size);
+    /* Append bytes array to the file without any extra data */
+    extern uint append_bytes(fs::path, const ubyte* data, size_t size);
+
+    /* Write string to the file */
     extern bool write_string(fs::path filename, const std::string content);
-    extern bool write_json(fs::path filename, const dynamic::Map* obj, bool nice=true);
-    extern bool write_binary_json(fs::path filename, const dynamic::Map* obj);
+
+    /* Write dynamic data to the JSON file
+       @param nice if true, 
+         human readable format will be used, otherwise minimal */
+    extern bool write_json(
+        fs::path filename, 
+        const dynamic::Map* obj, 
+        bool nice=true);
+
+    /* Write dynamic data to the binary JSON file
+       (see src/coders/binary_json_spec.md)
+       @param compressed use gzip compression */
+    extern bool write_binary_json(
+        fs::path filename, 
+        const dynamic::Map* obj, 
+        bool compressed=false);
 
     extern bool read(fs::path, char* data, size_t size);
-    extern char* read_bytes(fs::path, size_t& length);
+    extern ubyte* read_bytes(fs::path, size_t& length);
     extern std::string read_string(fs::path filename);
     extern std::unique_ptr<dynamic::Map> read_json(fs::path file);
     extern std::unique_ptr<dynamic::Map> read_binary_json(fs::path file);
diff --git a/src/frontend/BlocksPreview.cpp b/src/frontend/BlocksPreview.cpp
index 846afc4a..b400527e 100644
--- a/src/frontend/BlocksPreview.cpp
+++ b/src/frontend/BlocksPreview.cpp
@@ -8,47 +8,23 @@
 #include "../graphics/Texture.h"
 #include "../graphics/Atlas.h"
 #include "../graphics/Batch3D.h"
+#include "../graphics/Framebuffer.h"
+#include "../graphics/GfxContext.h"
+#include "../window/Window.h"
 #include "../window/Camera.h"
 #include "../voxels/Block.h"
+#include "../content/Content.h"
+#include "../constants.h"
 #include "ContentGfxCache.h"
 
-BlocksPreview::BlocksPreview(Assets* assets, const ContentGfxCache* cache)
-    : shader(assets->getShader("ui3d")), 
-      atlas(assets->getAtlas("blocks")), 
-      cache(cache) {
-    batch = std::make_unique<Batch3D>(1024);
-}
-
-BlocksPreview::~BlocksPreview() {
-}
-
-void BlocksPreview::begin(const Viewport* viewport) {
-    this->viewport = viewport;
-    shader->use();
-    shader->uniformMatrix("u_projview", 
-        glm::ortho(0.0f, float(viewport->getWidth()), 
-                   0.0f, float(viewport->getHeight()), 
-                    -100.0f, 100.0f) * 
-        glm::lookAt(glm::vec3(2, 2, 2), glm::vec3(0.0f), glm::vec3(0, 1, 0)));
-    atlas->getTexture()->bind();
-}
-
-/* Draw one block preview at given screen position */
-void BlocksPreview::draw(const Block* def, int x, int y, int size, glm::vec4 tint) {
-    uint width = viewport->getWidth();
-    uint height = viewport->getHeight();
-
-    y = height - y - 1 - 35 /* magic garbage */;
-    x += 2;
-
-    if (def->model == BlockModel::aabb) {
-        x += (1.0f - def->hitbox.size()).x * size * 0.5f;
-        y += (1.0f - def->hitbox.size()).y * size * 0.25f;
-    }
-
-    glm::vec3 offset (x/float(width) * 2, y/float(height) * 2, 0.0f);
-    shader->uniformMatrix("u_apply", glm::translate(glm::mat4(1.0f), offset));
-    
+ImageData* BlocksPreview::draw(
+    const ContentGfxCache* cache,
+    Framebuffer* fbo,
+    Batch3D* batch,
+    const Block* def, 
+    int size
+){
+    Window::clear();
     blockid_t id = def->rt.id;
     const UVRegion texfaces[6]{cache->getRegion(id, 0), cache->getRegion(id, 1),
                                cache->getRegion(id, 2), cache->getRegion(id, 3),
@@ -59,11 +35,12 @@ void BlocksPreview::draw(const Block* def, int x, int y, int size, glm::vec4 tin
             // something went wrong...
             break;
         case BlockModel::block:
-            batch->blockCube(glm::vec3(size * 0.63f), texfaces, tint, !def->rt.emissive);
+            batch->blockCube(glm::vec3(size * 0.63f), texfaces, 
+                             glm::vec4(1.0f), !def->rt.emissive);
             break;
         case BlockModel::aabb:
             batch->blockCube(def->hitbox.size() * glm::vec3(size * 0.63f), 
-                             texfaces, tint, !def->rt.emissive);
+                             texfaces, glm::vec4(1.0f), !def->rt.emissive);
             break;
         case BlockModel::custom:
         case BlockModel::xsprite: {
@@ -73,10 +50,64 @@ void BlocksPreview::draw(const Block* def, int x, int y, int size, glm::vec4 tin
                           right, 
                           size*0.5f, size*0.6f, 
                           texfaces[0], 
-                          tint);
+                          glm::vec4(1.0f));
             break;
         }
     }
-    
     batch->flush();
+    return fbo->texture->readData();
+}
+
+std::unique_ptr<Atlas> BlocksPreview::build(
+    const ContentGfxCache* cache,
+    Assets* assets, 
+    const Content* content
+) {
+    auto indices = content->getIndices();
+    size_t count = indices->countBlockDefs();
+    size_t iconSize = ITEM_ICON_SIZE;
+
+    Shader* shader = assets->getShader("ui3d");
+    Atlas* atlas = assets->getAtlas("blocks");
+
+    Viewport viewport(iconSize, iconSize);
+    GfxContext pctx(nullptr, viewport, nullptr);
+    GfxContext ctx = pctx.sub();
+    ctx.cullFace(true);
+    ctx.depthTest(true);
+
+    Framebuffer fbo(iconSize, iconSize, true);
+    Batch3D batch(1024);
+    batch.begin();
+
+    shader->use();
+    shader->uniformMatrix("u_projview",
+
+    glm::ortho(0.0f, float(iconSize), 0.0f, float(iconSize), 
+                -100.0f, 100.0f) * 
+        glm::lookAt(glm::vec3(2, 2, 2), 
+                    glm::vec3(0.0f), 
+                    glm::vec3(0, 1, 0)));
+
+    AtlasBuilder builder;
+    Window::viewport(0, 0, iconSize, iconSize);
+    Window::setBgColor(glm::vec4(0.0f));
+    
+    fbo.bind();
+    for (size_t i = 0; i < count; i++) {
+        auto def = indices->getBlockDef(i);
+
+        glm::vec3 offset(0.1f, 0.5f, 0.1f);
+        if (def->model == BlockModel::aabb) {
+            offset.y += (1.0f - def->hitbox.size()).y * 0.5f;
+        }
+        atlas->getTexture()->bind();
+        shader->uniformMatrix("u_apply", glm::translate(glm::mat4(1.0f), offset));
+
+        builder.add(def->name, draw(cache, &fbo, &batch, def, iconSize));
+    }
+    fbo.unbind();
+
+    Window::viewport(0, 0, Window::width, Window::height);
+    return std::unique_ptr<Atlas>(builder.build(2));
 }
diff --git a/src/frontend/BlocksPreview.h b/src/frontend/BlocksPreview.h
index 0a1a03f3..5c4ab4c1 100644
--- a/src/frontend/BlocksPreview.h
+++ b/src/frontend/BlocksPreview.h
@@ -6,25 +6,27 @@
 #include <memory>
 
 class Assets;
-class Viewport;
-class Shader;
+class ImageData;
 class Atlas;
+class Framebuffer;
 class Batch3D;
 class Block;
+class Content;
 class ContentGfxCache;
 
 class BlocksPreview {
-    Shader* shader;
-    Atlas* atlas;
-    std::unique_ptr<Batch3D> batch;
-    const ContentGfxCache* const cache;
-    const Viewport* viewport;
 public:
-    BlocksPreview(Assets* assets, const ContentGfxCache* cache);
-    ~BlocksPreview();
+    static ImageData* draw(
+        const ContentGfxCache* cache,
+        Framebuffer* framebuffer,
+        Batch3D* batch,
+        const Block* block, 
+        int size);
 
-    void begin(const Viewport* viewport);
-    void draw(const Block* block, int x, int y, int size, glm::vec4 tint);
+    static std::unique_ptr<Atlas> build(
+        const ContentGfxCache* cache,
+        Assets* assets, 
+        const Content* content);
 };
 
 #endif // FRONTEND_BLOCKS_PREVIEW_H_
diff --git a/src/frontend/InventoryView.cpp b/src/frontend/InventoryView.cpp
index 723af338..a09d64c1 100644
--- a/src/frontend/InventoryView.cpp
+++ b/src/frontend/InventoryView.cpp
@@ -28,6 +28,10 @@ void InventoryLayout::add(SlotLayout slot) {
     slots.push_back(slot);
 }
 
+void InventoryLayout::add(InventoryPanel panel) {
+    panels.push_back(panel);
+}
+
 void InventoryLayout::setSize(glm::vec2 size) {
     this->size = size;
 }
@@ -48,6 +52,10 @@ std::vector<SlotLayout>& InventoryLayout::getSlots() {
     return slots;
 }
 
+std::vector<InventoryPanel>& InventoryLayout::getPanels() {
+    return panels;
+}
+
 SlotLayout::SlotLayout(
     glm::vec2 position,
     bool background,
@@ -72,14 +80,17 @@ InventoryBuilder::InventoryBuilder()
 {}
 
 void InventoryBuilder::addGrid(
-    int cols, int rows, 
+    int cols, int count, 
     glm::vec2 coord, 
-    int padding, 
+    int padding,
+    bool addpanel,
     SlotLayout slotLayout) 
 {
     const int slotSize = InventoryView::SLOT_SIZE;
     const int interval = InventoryView::SLOT_INTERVAL;
 
+    int rows = ceildiv(count, cols);
+
     uint width =  cols * (slotSize + interval) - interval + padding*2;
     uint height = rows * (slotSize + interval) - interval + padding*2;
     
@@ -94,6 +105,8 @@ void InventoryBuilder::addGrid(
 
     for (int row = 0; row < rows; row++) {
         for (int col = 0; col < cols; col++) {
+            if (row * cols + col >= count)
+                break;
             glm::vec2 position (
                 col * (slotSize + interval) + padding,
                 row * (slotSize + interval) + padding
@@ -103,6 +116,32 @@ void InventoryBuilder::addGrid(
             layout->add(builtSlot);
         }
     }
+
+    if (addpanel) {
+        add(InventoryPanel(
+            coord, 
+            glm::vec2(width, height), 
+            glm::vec4(0, 0, 0, 0.5f)));
+    }
+}
+
+void InventoryBuilder::add(SlotLayout slotLayout) {
+    uint width =  InventoryView::SLOT_SIZE;
+    uint height = InventoryView::SLOT_SIZE;
+
+    auto coord = slotLayout.position;
+    auto lsize = layout->getSize();
+    if (coord.x + width > lsize.x) {
+        lsize.x = coord.x + width;
+    }
+    if (coord.y + height > lsize.y) {
+        lsize.y = coord.y + height;
+    }
+    layout->add(slotLayout);
+}
+
+void InventoryBuilder::add(InventoryPanel panel) {
+    layout->add(panel);
 }
 
 std::unique_ptr<InventoryLayout> InventoryBuilder::build() {
@@ -149,31 +188,23 @@ void SlotView::draw(Batch2D* batch, Assets* assets) {
     
     batch->color = glm::vec4(1.0f);
 
-    Shader* uiShader = assets->getShader("ui");
-    Viewport viewport(Window::width, Window::height);
-    GfxContext ctx(nullptr, viewport, batch);
-
-    auto preview = frontend->getBlocksPreview();
+    auto previews = frontend->getBlocksAtlas();
     auto indices = content->getIndices();
 
-    ItemDef* item = indices->getItemDef(stack.getItemId());    
+    ItemDef* item = indices->getItemDef(stack.getItemId());
     switch (item->iconType) {
         case item_icon_type::none:
             break;
-        case item_icon_type::block: 
-            batch->render();
-            {    
-                GfxContext subctx = ctx.sub();
-                subctx.depthTest(true);
-                subctx.cullFace(true);
+        case item_icon_type::block: {
+            Block* cblock = content->requireBlock(item->icon);
+            batch->texture(previews->getTexture());
 
-                Block* cblock = content->requireBlock(item->icon);
-                preview->begin(&subctx.getViewport());
-                preview->draw(cblock, coord.x, coord.y, slotSize, tint);
-            }
-            uiShader->use();
-            batch->begin();
+            UVRegion region = previews->get(cblock->name);
+            batch->rect(
+                coord.x, coord.y, slotSize, slotSize, 
+                0, 0, 0, region, false, true, tint);
             break;
+        }
         case item_icon_type::sprite: {
             size_t index = item->icon.find(':');
             std::string name = item->icon.substr(index+1);
@@ -279,14 +310,17 @@ InventoryView::InventoryView(
               frontend(frontend),
               interaction(interaction) {
     size(this->layout->getSize());
-    color(glm::vec4(0, 0, 0, 0.5f));
+    color(glm::vec4(0, 0, 0, 0.0f));
 }
 
 InventoryView::~InventoryView() {}
 
 void InventoryView::build() {
-    int index = 0;
+    size_t index = 0;
     for (auto& slot : layout->getSlots()) {
+        if (index >= inventory->size())
+            break;
+
         ItemStack& item = inventory->getSlot(index);
 
         auto view = std::make_shared<SlotView>(
@@ -320,15 +354,15 @@ InventoryLayout* InventoryView::getLayout() const {
     return layout.get();
 }
 
-// performance disaster x2
-void InventoryView::draw(Batch2D* batch, Assets* assets) {
-    Container::draw(batch, assets);
-    Window::clearDepth();
-}
-
 void InventoryView::drawBackground(Batch2D* batch, Assets* assets) {
     glm::vec2 coord = calcCoord();
+
     batch->texture(nullptr);
-    batch->color = color_;
-    batch->rect(coord.x-1, coord.y-1, size_.x+2, size_.y+2);
+
+    for (auto& panel : layout->getPanels()) {
+        glm::vec2 size = panel.size;
+        glm::vec2 pos = coord + panel.position;
+        batch->color = panel.color;
+        batch->rect(pos.x-1, pos.y-1, size.x+2, size.y+2);
+    }
 }
diff --git a/src/frontend/InventoryView.h b/src/frontend/InventoryView.h
index 1115428e..cb31da01 100644
--- a/src/frontend/InventoryView.h
+++ b/src/frontend/InventoryView.h
@@ -53,10 +53,12 @@ class InventoryLayout {
     glm::vec2 size;
     glm::vec2 origin;
     std::vector<SlotLayout> slots;
+    std::vector<InventoryPanel> panels;
 public:
     InventoryLayout(glm::vec2 size);
 
     void add(SlotLayout slot);
+    void add(InventoryPanel panel);
     void setSize(glm::vec2 size);
     void setOrigin(glm::vec2 origin);
 
@@ -64,6 +66,7 @@ public:
     glm::vec2 getOrigin() const;
 
     std::vector<SlotLayout>& getSlots();
+    std::vector<InventoryPanel>& getPanels();
 };
 
 class InventoryBuilder {
@@ -72,10 +75,15 @@ public:
     InventoryBuilder();
 
     void addGrid(
-        int cols, int rows, 
+        int cols, int count, 
         glm::vec2 coord, 
-        int padding, 
+        int padding,
+        bool addpanel,
         SlotLayout slotLayout);
+    
+    void add(SlotLayout slotLayout);
+    void add(InventoryPanel panel);
+
     std::unique_ptr<InventoryLayout> build();
 };
 
@@ -126,7 +134,6 @@ public:
 
     void build();
 
-    virtual void draw(Batch2D* batch, Assets* assets) override;
     virtual void drawBackground(Batch2D* batch, Assets* assets) override;
 
     void setInventory(std::shared_ptr<Inventory> inventory);
@@ -138,7 +145,7 @@ public:
     void setSelected(int index);
 
     static const int SLOT_INTERVAL = 4;
-    static const int SLOT_SIZE = 48;
+    static const int SLOT_SIZE = ITEM_ICON_SIZE;
 };
 
 class InventoryInteraction {
diff --git a/src/frontend/LevelFrontend.cpp b/src/frontend/LevelFrontend.cpp
index 4b1c6542..9561dfb2 100644
--- a/src/frontend/LevelFrontend.cpp
+++ b/src/frontend/LevelFrontend.cpp
@@ -2,6 +2,7 @@
 
 #include "../world/Level.h"
 #include "../assets/Assets.h"
+#include "../graphics/Atlas.h"
 #include "BlocksPreview.h"
 #include "ContentGfxCache.h"
 
@@ -9,8 +10,7 @@ LevelFrontend::LevelFrontend(Level* level, Assets* assets)
 : level(level),
   assets(assets),
   contentCache(std::make_unique<ContentGfxCache>(level->content, assets)),
-  blocksPreview(std::make_unique<BlocksPreview>(assets, contentCache.get())) {
-
+  blocksAtlas(BlocksPreview::build(contentCache.get(), assets, level->content)) {
 }
 
 LevelFrontend::~LevelFrontend() {
@@ -24,10 +24,10 @@ Assets* LevelFrontend::getAssets() const {
     return assets;
 }
 
-BlocksPreview* LevelFrontend::getBlocksPreview() const {
-    return blocksPreview.get();
-}
-
 ContentGfxCache* LevelFrontend::getContentGfxCache() const {
     return contentCache.get();
 }
+
+Atlas* LevelFrontend::getBlocksAtlas() const {
+    return blocksAtlas.get();
+}
diff --git a/src/frontend/LevelFrontend.h b/src/frontend/LevelFrontend.h
index 095f5535..98a8a111 100644
--- a/src/frontend/LevelFrontend.h
+++ b/src/frontend/LevelFrontend.h
@@ -3,6 +3,7 @@
 
 #include <memory>
 
+class Atlas;
 class Level;
 class Assets;
 class BlocksPreview;
@@ -12,15 +13,15 @@ class LevelFrontend {
     Level* level;
     Assets* assets;
     std::unique_ptr<ContentGfxCache> contentCache;
-    std::unique_ptr<BlocksPreview> blocksPreview;
+    std::unique_ptr<Atlas> blocksAtlas;
 public:
     LevelFrontend(Level* level, Assets* assets);
     ~LevelFrontend();
 
     Level* getLevel() const;
     Assets* getAssets() const;
-    BlocksPreview* getBlocksPreview() const;
     ContentGfxCache* getContentGfxCache() const;
+    Atlas* getBlocksAtlas() const;
 };
 
 
diff --git a/src/frontend/hud.cpp b/src/frontend/hud.cpp
index 8a4c3a0c..66a5ea6b 100644
--- a/src/frontend/hud.cpp
+++ b/src/frontend/hud.cpp
@@ -52,106 +52,106 @@ using glm::vec4;
 using namespace gui;
 
 inline std::shared_ptr<Label> create_label(gui::wstringsupplier supplier) {
-	auto label = std::make_shared<Label>(L"-");
-	label->textSupplier(supplier);
-	return label;
+    auto label = std::make_shared<Label>(L"-");
+    label->textSupplier(supplier);
+    return label;
 }
 
 void HudRenderer::createDebugPanel(Engine* engine) {
     auto level = frontend->getLevel();
 
     Panel* panel = new Panel(vec2(250, 200), vec4(5.0f), 1.0f);
-	debugPanel = std::shared_ptr<UINode>(panel);
-	panel->listenInterval(1.0f, [this]() {
-		fpsString = std::to_wstring(fpsMax)+L" / "+std::to_wstring(fpsMin);
-		fpsMin = fps;
-		fpsMax = fps;
-	});
-	panel->setCoord(vec2(10, 10));
-	panel->add(create_label([this](){ return L"fps: "+this->fpsString;}));
-	panel->add(create_label([this](){
-		return L"meshes: " + std::to_wstring(Mesh::meshesCount);
-	}));
-	panel->add(create_label([=](){
-		auto& settings = engine->getSettings();
-		bool culling = settings.graphics.frustumCulling;
-		return L"frustum-culling: "+std::wstring(culling ? L"on" : L"off");
-	}));
-	panel->add(create_label([=]() {
-		return L"chunks: "+std::to_wstring(level->chunks->chunksCount)+
-			   L" visible: "+std::to_wstring(level->chunks->visible);
-	}));
-	panel->add(create_label([=](){
-		auto player = level->player;
-		auto* indices = level->content->getIndices();
-		auto def = indices->getBlockDef(player->selectedVoxel.id);
-		std::wstringstream stream;
-		stream << std::hex << level->player->selectedVoxel.states;
-		if (def) {
-			stream << L" (" << util::str2wstr_utf8(def->name) << L")";
-		}
-		return L"block: "+std::to_wstring(player->selectedVoxel.id)+
-		       L" "+stream.str();
-	}));
-	panel->add(create_label([=](){
-		return L"seed: "+std::to_wstring(level->world->seed);
-	}));
+    debugPanel = std::shared_ptr<UINode>(panel);
+    panel->listenInterval(1.0f, [this]() {
+        fpsString = std::to_wstring(fpsMax)+L" / "+std::to_wstring(fpsMin);
+        fpsMin = fps;
+        fpsMax = fps;
+    });
+    panel->setCoord(vec2(10, 10));
+    panel->add(create_label([this](){ return L"fps: "+this->fpsString;}));
+    panel->add(create_label([this](){
+        return L"meshes: " + std::to_wstring(Mesh::meshesCount);
+    }));
+    panel->add(create_label([=](){
+        auto& settings = engine->getSettings();
+        bool culling = settings.graphics.frustumCulling;
+        return L"frustum-culling: "+std::wstring(culling ? L"on" : L"off");
+    }));
+    panel->add(create_label([=]() {
+        return L"chunks: "+std::to_wstring(level->chunks->chunksCount)+
+               L" visible: "+std::to_wstring(level->chunks->visible);
+    }));
+    panel->add(create_label([=](){
+        auto player = level->player;
+        auto* indices = level->content->getIndices();
+        auto def = indices->getBlockDef(player->selectedVoxel.id);
+        std::wstringstream stream;
+        stream << std::hex << level->player->selectedVoxel.states;
+        if (def) {
+            stream << L" (" << util::str2wstr_utf8(def->name) << L")";
+        }
+        return L"block: "+std::to_wstring(player->selectedVoxel.id)+
+               L" "+stream.str();
+    }));
+    panel->add(create_label([=](){
+        return L"seed: "+std::to_wstring(level->world->getSeed());
+    }));
 
-	for (int ax = 0; ax < 3; ax++){
-		Panel* sub = new Panel(vec2(10, 27), vec4(0.0f));
-		sub->orientation(Orientation::horizontal);
+    for (int ax = 0; ax < 3; ax++){
+        Panel* sub = new Panel(vec2(10, 27), vec4(0.0f));
+        sub->orientation(Orientation::horizontal);
 
-		std::wstring str = L"x: ";
-		str[0] += ax;
-		Label* label = new Label(str);
-		label->margin(vec4(2, 3, 2, 3));
-		sub->add(label);
-		sub->color(vec4(0.0f));
+        std::wstring str = L"x: ";
+        str[0] += ax;
+        Label* label = new Label(str);
+        label->margin(vec4(2, 3, 2, 3));
+        sub->add(label);
+        sub->color(vec4(0.0f));
 
-		// Coord input
-		TextBox* box = new TextBox(L"");
-		box->textSupplier([=]() {
-			Hitbox* hitbox = level->player->hitbox.get();
-			return util::to_wstring(hitbox->position[ax], 2);
-		});
-		box->textConsumer([=](std::wstring text) {
-			try {
-				vec3 position = level->player->hitbox->position;
-				position[ax] = std::stoi(text);
-				level->player->teleport(position);
-			} catch (std::invalid_argument& _){
-			}
-		});
-		box->setOnEditStart([=](){
-			Hitbox* hitbox = level->player->hitbox.get();
-			box->text(std::to_wstring(int(hitbox->position[ax])));
-		});
+        // Coord input
+        TextBox* box = new TextBox(L"");
+        box->textSupplier([=]() {
+            Hitbox* hitbox = level->player->hitbox.get();
+            return util::to_wstring(hitbox->position[ax], 2);
+        });
+        box->textConsumer([=](std::wstring text) {
+            try {
+                vec3 position = level->player->hitbox->position;
+                position[ax] = std::stoi(text);
+                level->player->teleport(position);
+            } catch (std::invalid_argument& _){
+            }
+        });
+        box->setOnEditStart([=](){
+            Hitbox* hitbox = level->player->hitbox.get();
+            box->text(std::to_wstring(int(hitbox->position[ax])));
+        });
 
-		sub->add(box);
-		panel->add(sub);
-	}
-	panel->add(create_label([=](){
-		int hour, minute, second;
-		timeutil::from_value(level->world->daytime, hour, minute, second);
+        sub->add(box);
+        panel->add(sub);
+    }
+    panel->add(create_label([=](){
+        int hour, minute, second;
+        timeutil::from_value(level->world->daytime, hour, minute, second);
 
-		std::wstring timeString = 
-					 util::lfill(std::to_wstring(hour), 2, L'0') + L":" +
-					 util::lfill(std::to_wstring(minute), 2, L'0');
-		return L"time: "+timeString;
-	}));
-	{
-		TrackBar* bar = new TrackBar(0.0f, 1.0f, 1.0f, 0.005f, 8);
-		bar->supplier([=]() {return level->world->daytime;});
-		bar->consumer([=](double val) {level->world->daytime = val;});
-		panel->add(bar);
-	}
-	{
-		TrackBar* bar = new TrackBar(0.0f, 1.0f, 0.0f, 0.005f, 8);
-		bar->supplier([=]() {return WorldRenderer::fog;});
-		bar->consumer([=](double val) {WorldRenderer::fog = val;});
-		panel->add(bar);
-	}
-	{
+        std::wstring timeString = 
+                     util::lfill(std::to_wstring(hour), 2, L'0') + L":" +
+                     util::lfill(std::to_wstring(minute), 2, L'0');
+        return L"time: "+timeString;
+    }));
+    {
+        TrackBar* bar = new TrackBar(0.0f, 1.0f, 1.0f, 0.005f, 8);
+        bar->supplier([=]() {return level->world->daytime;});
+        bar->consumer([=](double val) {level->world->daytime = val;});
+        panel->add(bar);
+    }
+    {
+        TrackBar* bar = new TrackBar(0.0f, 1.0f, 0.0f, 0.005f, 8);
+        bar->supplier([=]() {return WorldRenderer::fog;});
+        bar->consumer([=](double val) {WorldRenderer::fog = val;});
+        panel->add(bar);
+    }
+    {
         auto checkbox = new FullCheckBox(L"Show Chunk Borders", vec2(400, 32));
         checkbox->supplier([=]() {
             return engine->getSettings().debug.showChunkBorders;
@@ -160,8 +160,8 @@ void HudRenderer::createDebugPanel(Engine* engine) {
             engine->getSettings().debug.showChunkBorders = checked;
         });
         panel->add(checkbox);
-	}
-	panel->refresh();
+    }
+    panel->refresh();
 }
 
 std::shared_ptr<InventoryView> HudRenderer::createContentAccess() {
@@ -177,37 +177,25 @@ std::shared_ptr<InventoryView> HudRenderer::createContentAccess() {
         accessInventory->getSlot(id-1).set(ItemStack(id, 1));
     }
 
-    const int slotSize = InventoryView::SLOT_SIZE;
-    const int interval = InventoryView::SLOT_INTERVAL;
-    int padding = 8;
+    SlotLayout slotLayout(glm::vec2(), false, true, 
+    [=](ItemStack& item) {
+        auto copy = ItemStack(item);
+        inventory->move(copy, indices);
+    }, 
+    [=](ItemStack& item, ItemStack& grabbed) {
+        inventory->getSlot(player->getChosenSlot()).set(item);
+    });
+
+    InventoryBuilder builder;
+    builder.addGrid(8, itemsCount-1, glm::vec2(), 8, true, slotLayout);
+    auto layout = builder.build();
 
-    int columns = 8;
-    int rows = ceildiv(itemsCount-1, columns);
-    uint cawidth = columns * (slotSize + interval) - interval + padding;
-    uint caheight = rows * (slotSize + interval) - interval + padding*2;
-    auto layout = std::make_unique<InventoryLayout>(glm::vec2(cawidth, caheight));
-    for (int i = 0; i < itemsCount-1; i++) {
-        int row = i / columns;
-        int col = i % columns;
-        glm::vec2 position (
-            col * slotSize + (col-1) * interval + padding,
-            row * slotSize + (row-1) * interval + padding
-        );
-        layout->add(SlotLayout(position, false, true, 
-        [=](ItemStack& item) {
-            auto copy = ItemStack(item);
-            inventory->move(copy, indices);
-        }, 
-        [=](ItemStack& item, ItemStack& grabbed) {
-            inventory->getSlot(player->getChosenSlot()).set(item);
-        }));
-    }
     auto contentAccess = std::make_shared<InventoryView>(
         content, 
-		frontend, 
-		interaction.get(), 
-		accessInventory, 
-		std::move(layout)
+        frontend, 
+        interaction.get(), 
+        accessInventory, 
+        std::move(layout)
     );
     contentAccess->build();
     return contentAccess;
@@ -219,24 +207,18 @@ std::shared_ptr<InventoryView> HudRenderer::createHotbar() {
     auto inventory = player->getInventory();
     auto content = level->content;
 
-    const int slotSize = InventoryView::SLOT_SIZE;
-    const int interval = InventoryView::SLOT_INTERVAL;
+    SlotLayout slotLayout(glm::vec2(), false, false, nullptr, nullptr);
+    InventoryBuilder builder;
+    builder.addGrid(10, 10, glm::vec2(), 4, true, slotLayout);
+    auto layout = builder.build();
 
-    int padding = 4;
-    uint width = 10 * (slotSize + interval) - interval + padding*2;
-    uint height = slotSize + padding * 2;
-    auto layout = std::make_unique<InventoryLayout>(glm::vec2(width, height));
-    for (int i = 0; i < 10; i++) {
-        glm::vec2 position (i * (slotSize + interval) + padding, padding);
-        layout->add(SlotLayout(position, false, false, nullptr, nullptr));
-    }
-    layout->setOrigin(glm::vec2(width / 2, 0));
+    layout->setOrigin(glm::vec2(layout->getSize().x/2, 0));
     auto view = std::make_shared<InventoryView>(
         content, 
-		frontend, 
-		interaction.get(), 
-		inventory, 
-		std::move(layout)
+        frontend, 
+        interaction.get(), 
+        inventory, 
+        std::move(layout)
     );
     view->build();
     view->setInteractive(false);
@@ -252,13 +234,9 @@ std::shared_ptr<InventoryView> HudRenderer::createInventory() {
     SlotLayout slotLayout(glm::vec2(), true, false, [=](ItemStack& stack) {
         stack.clear();
     }, nullptr);
-    
-    int columns = 10;
-    int rows = ceildiv(inventory->size(), columns);
-    int padding = 4;
 
     InventoryBuilder builder;
-    builder.addGrid(columns, rows, glm::vec2(), padding, slotLayout);
+    builder.addGrid(10, inventory->size(), glm::vec2(), 4, true, slotLayout);
     auto layout = builder.build();
 
     auto view = std::make_shared<InventoryView>(
@@ -277,13 +255,13 @@ HudRenderer::HudRenderer(Engine* engine, LevelFrontend* frontend)
       gui(engine->getGUI()),
       frontend(frontend)
 {
-	auto menu = gui->getMenu();
+    auto menu = gui->getMenu();
 
     interaction = std::make_unique<InventoryInteraction>();
     grabbedItemView = std::make_shared<SlotView>(
         interaction->getGrabbedItem(), 
         frontend,
-		interaction.get(),
+        interaction.get(),
         frontend->getLevel()->content,
         SlotLayout(glm::vec2(), false, false, nullptr, nullptr)
     );
@@ -301,14 +279,14 @@ HudRenderer::HudRenderer(Engine* engine, LevelFrontend* frontend)
     hotbarView = createHotbar();
     inventoryView = createInventory();
 
-	uicamera = new Camera(vec3(), 1);
-	uicamera->perspective = false;
-	uicamera->flipped = true;
+    uicamera = new Camera(vec3(), 1);
+    uicamera->perspective = false;
+    uicamera->flipped = true;
 
     createDebugPanel(engine);
-	menu->reset();
-	
-	gui->add(debugPanel);
+    menu->reset();
+    
+    gui->add(debugPanel);
     gui->add(contentAccessPanel);
     gui->add(hotbarView);
     gui->add(inventoryView);
@@ -320,48 +298,48 @@ HudRenderer::~HudRenderer() {
     gui->remove(inventoryView);
     gui->remove(hotbarView);
     gui->remove(contentAccessPanel);
-	gui->remove(debugPanel);
-	delete uicamera;
+    gui->remove(debugPanel);
+    delete uicamera;
 }
 
 void HudRenderer::drawDebug(int fps){
-	this->fps = fps;
-	fpsMin = min(fps, fpsMin);
-	fpsMax = max(fps, fpsMax);
+    this->fps = fps;
+    fpsMin = min(fps, fpsMin);
+    fpsMax = max(fps, fpsMax);
 }
 
 void HudRenderer::update(bool visible) {
     auto level = frontend->getLevel();
     auto player = level->player;
-	auto menu = gui->getMenu();
+    auto menu = gui->getMenu();
 
     menu->visible(pause);
 
     if (!visible && inventoryOpen) {
         inventoryOpen = false;
     }
-	if (pause && menu->current().panel == nullptr) {
-		pause = false;
-	}
-	if (Events::jpressed(keycode::ESCAPE) && !gui->isFocusCaught()) {
-		if (pause) {
-			pause = false;
-			menu->reset();
-		} else if (inventoryOpen) {
-			inventoryOpen = false;
-		} else {
-			pause = true;
-			menu->set("pause");
-		}
-	}
-	if (visible && Events::jactive(BIND_HUD_INVENTORY)) {
-		if (!pause) {
-			inventoryOpen = !inventoryOpen;
-		}
-	}
-	if ((pause || inventoryOpen) == Events::_cursor_locked) {
-		Events::toggleCursor();
-	}
+    if (pause && menu->current().panel == nullptr) {
+        pause = false;
+    }
+    if (Events::jpressed(keycode::ESCAPE) && !gui->isFocusCaught()) {
+        if (pause) {
+            pause = false;
+            menu->reset();
+        } else if (inventoryOpen) {
+            inventoryOpen = false;
+        } else {
+            pause = true;
+            menu->set("pause");
+        }
+    }
+    if (visible && Events::jactive(BIND_HUD_INVENTORY)) {
+        if (!pause) {
+            inventoryOpen = !inventoryOpen;
+        }
+    }
+    if ((pause || inventoryOpen) == Events::_cursor_locked) {
+        Events::toggleCursor();
+    }
 
     glm::vec2 invSize = contentAccessPanel->size();
     inventoryView->visible(inventoryOpen);
@@ -387,10 +365,10 @@ void HudRenderer::update(bool visible) {
 }
 
 void HudRenderer::drawOverlay(const GfxContext& ctx) {
-	if (pause) {
-	    Shader* uishader = assets->getShader("ui");
-	    uishader->use();
-	    uishader->uniformMatrix("u_projview", uicamera->getProjView());
+    if (pause) {
+        Shader* uishader = assets->getShader("ui");
+        uishader->use();
+        uishader->uniformMatrix("u_projview", uicamera->getProjView());
 
         const Viewport& viewport = ctx.getViewport();
         const uint width = viewport.getWidth();
@@ -398,48 +376,48 @@ void HudRenderer::drawOverlay(const GfxContext& ctx) {
         auto batch = ctx.getBatch2D();
         batch->begin();
 
-		// draw fullscreen dark overlay
-		batch->texture(nullptr);
-		batch->color = vec4(0.0f, 0.0f, 0.0f, 0.5f);
-		batch->rect(0, 0, width, height);
+        // draw fullscreen dark overlay
+        batch->texture(nullptr);
+        batch->color = vec4(0.0f, 0.0f, 0.0f, 0.5f);
+        batch->rect(0, 0, width, height);
         batch->render();
-	}
+    }
 } 
 
 void HudRenderer::draw(const GfxContext& ctx){
     auto level = frontend->getLevel();
 
-	const Viewport& viewport = ctx.getViewport();
-	const uint width = viewport.getWidth();
-	const uint height = viewport.getHeight();
+    const Viewport& viewport = ctx.getViewport();
+    const uint width = viewport.getWidth();
+    const uint height = viewport.getHeight();
 
-	Player* player = level->player;
-	debugPanel->visible(player->debug);
+    Player* player = level->player;
+    debugPanel->visible(player->debug);
 
-	uicamera->setFov(height);
+    uicamera->setFov(height);
 
     auto batch = ctx.getBatch2D();
-	batch->begin();
+    batch->begin();
 
-	Shader* uishader = assets->getShader("ui");
-	uishader->use();
-	uishader->uniformMatrix("u_projview", uicamera->getProjView());
-	
-	// Draw selected item preview
+    Shader* uishader = assets->getShader("ui");
+    uishader->use();
+    uishader->uniformMatrix("u_projview", uicamera->getProjView());
+    
+    // Draw selected item preview
     hotbarView->setCoord(glm::vec2(width/2, height-65));
     hotbarView->setSelected(player->getChosenSlot());
 
-	// Crosshair
-	batch->begin();
-	if (!pause && Events::_cursor_locked && !level->player->debug) {
-		batch->lineWidth(2);
-		batch->line(width/2, height/2-6, width/2, height/2+6, 0.2f, 0.2f, 0.2f, 1.0f);
-		batch->line(width/2+6, height/2, width/2-6, height/2, 0.2f, 0.2f, 0.2f, 1.0f);
-		batch->line(width/2-5, height/2-5, width/2+5, height/2+5, 0.9f, 0.9f, 0.9f, 1.0f);
-		batch->line(width/2+5, height/2-5, width/2-5, height/2+5, 0.9f, 0.9f, 0.9f, 1.0f);
-	}
+    // Crosshair
+    batch->begin();
+    if (!pause && Events::_cursor_locked && !level->player->debug) {
+        batch->lineWidth(2);
+        batch->line(width/2, height/2-6, width/2, height/2+6, 0.2f, 0.2f, 0.2f, 1.0f);
+        batch->line(width/2+6, height/2, width/2-6, height/2, 0.2f, 0.2f, 0.2f, 1.0f);
+        batch->line(width/2-5, height/2-5, width/2+5, height/2+5, 0.9f, 0.9f, 0.9f, 1.0f);
+        batch->line(width/2+5, height/2-5, width/2-5, height/2+5, 0.9f, 0.9f, 0.9f, 1.0f);
+    }
 
-	if (inventoryOpen) {
+    if (inventoryOpen) {
         auto caLayout = contentAccess->getLayout();
         auto invLayout = inventoryView->getLayout();
         float caWidth = caLayout->getSize().x;
@@ -452,15 +430,15 @@ void HudRenderer::draw(const GfxContext& ctx){
             height/2-invSize.y/2
         ));
         contentAccessPanel->setCoord(glm::vec2(width-caWidth, 0));
-	}
+    }
     grabbedItemView->setCoord(glm::vec2(Events::cursor));
-	batch->render();
+    batch->render();
 }
 
 bool HudRenderer::isInventoryOpen() const {
-	return inventoryOpen;
+    return inventoryOpen;
 }
 
 bool HudRenderer::isPause() const {
-	return pause;
+    return pause;
 }
diff --git a/src/graphics/Framebuffer.cpp b/src/graphics/Framebuffer.cpp
index 77ae7462..d5f38398 100644
--- a/src/graphics/Framebuffer.cpp
+++ b/src/graphics/Framebuffer.cpp
@@ -3,13 +3,15 @@
 #include <GL/glew.h>
 #include "Texture.h"
 
-Framebuffer::Framebuffer(uint width, uint height) : width(width), height(height) {
+Framebuffer::Framebuffer(uint width, uint height, bool alpha) 
+    : width(width), height(height) {
 	glGenFramebuffers(1, &fbo);
 	bind();
 	GLuint tex;
 	glGenTextures(1, &tex);
 	glBindTexture(GL_TEXTURE_2D, tex);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
+    GLuint format = alpha ? GL_RGBA : GL_RGB;
+	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, nullptr);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
diff --git a/src/graphics/Framebuffer.h b/src/graphics/Framebuffer.h
index 0214d0c2..e6111244 100644
--- a/src/graphics/Framebuffer.h
+++ b/src/graphics/Framebuffer.h
@@ -12,7 +12,7 @@ public:
 	uint width;
 	uint height;
 	Texture* texture;
-	Framebuffer(uint width, uint height);
+	Framebuffer(uint width, uint height, bool alpha=false);
 	~Framebuffer();
 
 	void bind();
diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
index 0d5ae803..5531be1e 100644
--- a/src/graphics/Texture.cpp
+++ b/src/graphics/Texture.cpp
@@ -1,52 +1,61 @@
 #include "Texture.h"
 #include <GL/glew.h>
 #include <stdexcept>
+#include <memory>
 
 #include "ImageData.h"
 
 Texture::Texture(uint id, int width, int height) 
-	: id(id), width(width), height(height) {
+    : id(id), width(width), height(height) {
 }
 
 Texture::Texture(ubyte* data, int width, int height, uint format) 
-	: width(width), height(height) {
-	glGenTextures(1, &id);
-	glBindTexture(GL_TEXTURE_2D, id);
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
-		format, GL_UNSIGNED_BYTE, (GLvoid *) data);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-	glGenerateMipmap(GL_TEXTURE_2D);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 2);
-	glBindTexture(GL_TEXTURE_2D, 0);
+    : width(width), height(height) {
+    glGenTextures(1, &id);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
+        format, GL_UNSIGNED_BYTE, (GLvoid *) data);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 2);
+    glBindTexture(GL_TEXTURE_2D, 0);
 }
 
 Texture::~Texture() {
-	glDeleteTextures(1, &id);
+    glDeleteTextures(1, &id);
 }
 
 void Texture::bind(){
-	glBindTexture(GL_TEXTURE_2D, id);
+    glBindTexture(GL_TEXTURE_2D, id);
 }
 
 void Texture::reload(ubyte* data){
-	glBindTexture(GL_TEXTURE_2D, id);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
-		GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) data);
-	glBindTexture(GL_TEXTURE_2D, 0);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+        GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) data);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+ImageData* Texture::readData() {
+    std::unique_ptr<ubyte[]> data (new ubyte[width * height * 4]);
+    glBindTexture(GL_TEXTURE_2D, id);
+    glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data.get());
+    glBindTexture(GL_TEXTURE_2D, 0);
+    return new ImageData(ImageFormat::rgba8888, width, height, data.release());
 }
 
 Texture* Texture::from(const ImageData* image) {
-	uint width = image->getWidth();
-	uint height = image->getHeight();
-	uint format;
-	const void* data = image->getData();
-	switch (image->getFormat())	{
-		case ImageFormat::rgb888: format = GL_RGB; break;
-		case ImageFormat::rgba8888: format = GL_RGBA; break;
-		default:
-			throw std::runtime_error("unsupported image data format");
-	}
-	return new Texture((ubyte*)data, width, height, format);
-}
\ No newline at end of file
+    uint width = image->getWidth();
+    uint height = image->getHeight();
+    uint format;
+    const void* data = image->getData();
+    switch (image->getFormat())	{
+        case ImageFormat::rgb888: format = GL_RGB; break;
+        case ImageFormat::rgba8888: format = GL_RGBA; break;
+        default:
+            throw std::runtime_error("unsupported image data format");
+    }
+    return new Texture((ubyte*)data, width, height, format);
+}
diff --git a/src/graphics/Texture.h b/src/graphics/Texture.h
index 4e85cb86..2dc9064e 100644
--- a/src/graphics/Texture.h
+++ b/src/graphics/Texture.h
@@ -8,17 +8,19 @@ class ImageData;
 
 class Texture {
 public:
-	uint id;
-	int width;
-	int height;
-	Texture(uint id, int width, int height);
-	Texture(ubyte* data, int width, int height, uint format);
-	~Texture();
+    uint id;
+    int width;
+    int height;
+    Texture(uint id, int width, int height);
+    Texture(ubyte* data, int width, int height, uint format);
+    ~Texture();
 
-	void bind();
-	void reload(ubyte* data);
+    void bind();
+    void reload(ubyte* data);
 
-	static Texture* from(const ImageData* image);
+    ImageData* readData();
+
+    static Texture* from(const ImageData* image);
 };
 
 #endif /* GRAPHICS_TEXTURE_H_ */
diff --git a/src/items/Inventory.cpp b/src/items/Inventory.cpp
index ba2025ad..cc4b1a2c 100644
--- a/src/items/Inventory.cpp
+++ b/src/items/Inventory.cpp
@@ -4,7 +4,7 @@ Inventory::Inventory(size_t size) : slots(size) {
 }
 
 ItemStack& Inventory::getSlot(size_t index) {
-    return slots[index];
+    return slots.at(index);
 }
 
 size_t Inventory::findEmptySlot(size_t begin, size_t end) const {
diff --git a/src/items/Inventory.h b/src/items/Inventory.h
index 34a38b44..6cde29a7 100644
--- a/src/items/Inventory.h
+++ b/src/items/Inventory.h
@@ -11,6 +11,7 @@
 
 class ContentIndices;
 
+// TODO: items indices fix
 class Inventory {
     std::vector<ItemStack> slots;
 public:
diff --git a/src/logic/ChunksController.cpp b/src/logic/ChunksController.cpp
index c666c0fd..a3d013fb 100644
--- a/src/logic/ChunksController.cpp
+++ b/src/logic/ChunksController.cpp
@@ -102,7 +102,11 @@ bool ChunksController::loadVisible(){
 	chunks->putChunk(chunk);
 
 	if (!chunk->isLoaded()) {
-		generator->generate(chunk->voxels, chunk->x, chunk->z, level->world->seed);
+		generator->generate(
+            chunk->voxels, 
+            chunk->x, chunk->z, 
+            level->world->getSeed()
+        );
 		chunk->setUnsaved(true);
 	}
 
diff --git a/src/logic/scripting/api_lua.cpp b/src/logic/scripting/api_lua.cpp
index 75eacfdc..b05595b8 100644
--- a/src/logic/scripting/api_lua.cpp
+++ b/src/logic/scripting/api_lua.cpp
@@ -47,6 +47,11 @@ static const luaL_Reg packlib [] = {
 };
 
 /* == world library == */
+static int l_world_get_total_time(lua_State* L) {
+    lua_pushnumber(L, scripting::level->world->totalTime);
+    return 1;
+}
+
 static int l_world_get_day_time(lua_State* L) {
     lua_pushnumber(L, scripting::level->world->daytime);
     return 1;
@@ -59,11 +64,12 @@ static int l_world_set_day_time(lua_State* L) {
 }
 
 static int l_world_get_seed(lua_State* L) {
-    lua_pushinteger(L, scripting::level->world->seed);
+    lua_pushinteger(L, scripting::level->world->getSeed());
     return 1;
 }
 
 static const luaL_Reg worldlib [] = {
+    {"get_total_time", l_world_get_total_time},
     {"get_day_time", l_world_get_day_time},
     {"set_day_time", l_world_set_day_time},
     {"get_seed", l_world_get_seed},
@@ -261,14 +267,14 @@ static int l_set_block_user_bits(lua_State* L) {
     int offset = lua_tointeger(L, 4) + VOXEL_USER_BITS_OFFSET;
     int bits = lua_tointeger(L, 5);
 
-    uint mask = (1 << bits) - 1;
-    int value = lua_tointeger(L, 6) & mask;
+    uint mask = ((1 << bits) - 1) << offset;
+    int value = (lua_tointeger(L, 6) << offset) & mask;
     
     voxel* vox = scripting::level->chunks->get(x, y, z);
     if (vox == nullptr) {
         return 0;
     }
-    vox->states = (vox->states & (~mask)) | (value << offset);
+    vox->states = (vox->states & (~mask)) | value;
     return 0;
 }
 
diff --git a/src/logic/scripting/scripting.cpp b/src/logic/scripting/scripting.cpp
index 4ab975f3..bddd54dd 100644
--- a/src/logic/scripting/scripting.cpp
+++ b/src/logic/scripting/scripting.cpp
@@ -26,6 +26,10 @@ Level* scripting::level = nullptr;
 const Content* scripting::content = nullptr;
 BlocksController* scripting::blocks = nullptr;
 
+static void handleError(lua_State* L) {
+    std::cerr << "lua error: " << lua_tostring(L,-1) << std::endl;
+}
+
 inline int lua_pushivec3(lua_State* L, int x, int y, int z) {
     lua_pushinteger(L, x);
     lua_pushinteger(L, y);
@@ -51,13 +55,24 @@ bool rename_global(lua_State* L, const char* src, const char* dst) {
 
 int call_func(lua_State* L, int argc, const std::string& name) {
     if (lua_pcall(L, argc, LUA_MULTRET, 0)) {
-        std::cerr << "Lua error in " << name << ": ";
-        std::cerr << lua_tostring(L,-1) << std::endl;
+        handleError(L);
         return 0;
     }
     return 1;
 }
 
+void load_script(fs::path name) {
+    auto paths = scripting::engine->getPaths();
+    fs::path file = paths->getResources()/fs::path("scripts")/name;
+
+    std::string src = files::read_string(file);
+    if (luaL_loadbuffer(L, src.c_str(), src.length(), file.u8string().c_str())) {
+        handleError(L);
+        return;
+    }
+    call_func(L, 0, file.u8string());
+}
+
 void scripting::initialize(Engine* engine) {
     scripting::engine = engine;
 
@@ -81,17 +96,15 @@ void scripting::initialize(Engine* engine) {
 #   endif // LUAJIT_VERSION
 
     apilua::create_funcs(L);
+
+    load_script(fs::path("stdlib.lua"));
 }
 
 void scripting::on_world_load(Level* level, BlocksController* blocks) {
     scripting::level = level;
     scripting::content = level->content;
     scripting::blocks = blocks;
-    auto paths = scripting::engine->getPaths();
-    fs::path file = paths->getResources()/fs::path("scripts/world.lua");
-    std::string src = files::read_string(file);
-    luaL_loadbuffer(L, src.c_str(), src.length(), file.string().c_str());
-    call_func(L, 0, "<script>");
+    load_script("world.lua");
 }
 
 void scripting::on_world_quit() {
@@ -165,7 +178,7 @@ void scripting::load_block_script(std::string prefix, fs::path file, block_funcs
     std::string src = files::read_string(file);
     std::cout << "loading script " << file.u8string() << std::endl;
     if (luaL_loadbuffer(L, src.c_str(), src.size(), file.string().c_str())) {
-        std::cerr << "Lua error:" << lua_tostring(L,-1) << std::endl;
+        handleError(L);
         return;
     }
     call_func(L, 0, "<script>");
@@ -181,7 +194,7 @@ void scripting::load_item_script(std::string prefix, fs::path file, item_funcs_s
     std::string src = files::read_string(file);
     std::cout << "loading script " << file.u8string() << std::endl;
     if (luaL_loadbuffer(L, src.c_str(), src.size(), file.string().c_str())) {
-        std::cerr << "Lua error:" << lua_tostring(L,-1) << std::endl;
+        handleError(L);
         return;
     }
     call_func(L, 0, "<script>");
diff --git a/src/window/Window.cpp b/src/window/Window.cpp
index 05d4dd68..6a692902 100644
--- a/src/window/Window.cpp
+++ b/src/window/Window.cpp
@@ -179,6 +179,10 @@ void Window::setBgColor(glm::vec3 color) {
 	glClearColor(color.r, color.g, color.b, 1.0f);
 }
 
+void Window::setBgColor(glm::vec4 color) {
+	glClearColor(color.r, color.g, color.b, color.a);
+}
+
 void Window::viewport(int x, int y, int width, int height){
 	glViewport(x, y, width, height);
 }
diff --git a/src/window/Window.h b/src/window/Window.h
index 4fb7ed34..e9f925cd 100644
--- a/src/window/Window.h
+++ b/src/window/Window.h
@@ -48,6 +48,7 @@ public:
 	static void clear();
 	static void clearDepth();
 	static void setBgColor(glm::vec3 color);
+    static void setBgColor(glm::vec4 color);
 	static double time();
     static const char* getClipboardText();
 	static DisplaySettings* getSettings();
diff --git a/src/world/World.cpp b/src/world/World.cpp
index 4ba78793..5d1f03dd 100644
--- a/src/world/World.cpp
+++ b/src/world/World.cpp
@@ -13,101 +13,115 @@
 #include "../objects/Player.h"
 #include "../window/Camera.h"
 
-using glm::vec3;
-using std::unique_ptr;
-using std::shared_ptr;
-using std::string;
-using std::filesystem::path;
-namespace fs = std::filesystem;
-
-world_load_error::world_load_error(string message) : std::runtime_error(message) {
+world_load_error::world_load_error(std::string message) 
+    : std::runtime_error(message) {
 }
 
-World::World(string name, 
-			 path directory, 
-			 uint64_t seed, 
-			 EngineSettings& settings,
-			 const Content* content,
-			 const std::vector<ContentPack> packs) 
-		: settings(settings), 
-		  content(content),
-		  packs(packs),
-		  name(name), 
-		  seed(seed) {
-	wfile = new WorldFiles(directory, settings.debug);
+World::World(
+    std::string name, 
+    fs::path directory, 
+    uint64_t seed, 
+    EngineSettings& settings,
+    const Content* content,
+    const std::vector<ContentPack> packs) 
+    : name(name),
+      seed(seed),
+      settings(settings), 
+      content(content),
+      packs(packs) {
+    wfile = new WorldFiles(directory, settings.debug);
 }
 
 World::~World(){
-	delete wfile;
+    delete wfile;
 }
 
 void World::updateTimers(float delta) {
-	daytime += delta * daytimeSpeed;
-	daytime = fmod(daytime, 1.0f);
+    daytime += delta * daytimeSpeed;
+    daytime = fmod(daytime, 1.0f);
+    totalTime += delta;
 }
 
 void World::write(Level* level) {
-	const Content* content = level->content;
+    const Content* content = level->content;
 
-	Chunks* chunks = level->chunks;
+    Chunks* chunks = level->chunks;
 
-	for (size_t i = 0; i < chunks->volume; i++) {
-		shared_ptr<Chunk> chunk = chunks->chunks[i];
-		if (chunk == nullptr || !chunk->isLighted())
-			continue;
-		bool lightsUnsaved = !chunk->isLoadedLights() && 
-							  settings.debug.doWriteLights;
-		if (!chunk->isUnsaved() && !lightsUnsaved)
-			continue;
-		wfile->put(chunk.get());
-	}
+    for (size_t i = 0; i < chunks->volume; i++) {
+        auto chunk = chunks->chunks[i];
+        if (chunk == nullptr || !chunk->isLighted())
+            continue;
+        bool lightsUnsaved = !chunk->isLoadedLights() && 
+                              settings.debug.doWriteLights;
+        if (!chunk->isUnsaved() && !lightsUnsaved)
+            continue;
+        wfile->put(chunk.get());
+    }
 
-	wfile->write(this, content);
-	wfile->writePlayer(level->player);
+    wfile->write(this, content);
+    wfile->writePlayer(level->player);
 }
 
 const float DEF_PLAYER_Y = 100.0f;
 const float DEF_PLAYER_SPEED = 4.0f;
 
-Level* World::create(string name, 
-					path directory, 
-					uint64_t seed,
-					EngineSettings& settings, 
-					const Content* content,
-					const std::vector<ContentPack>& packs) {
-	World* world = new World(name, directory, seed, settings, content, packs);
-	Player* player = new Player(vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
-	return new Level(world, content, player, settings);
+Level* World::create(std::string name, 
+                     fs::path directory, 
+                     uint64_t seed,
+                     EngineSettings& settings, 
+                     const Content* content,
+                     const std::vector<ContentPack>& packs) {
+    World* world = new World(name, directory, seed, settings, content, packs);
+    Player* player = new Player(glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
+    return new Level(world, content, player, settings);
 }
 
-ContentLUT* World::checkIndices(const path& directory, 
-                                     const Content* content) {
-	path indicesFile = directory/path("indices.json");
-	if (fs::is_regular_file(indicesFile)) {
-		return ContentLUT::create(indicesFile, content);
-	}
-	return nullptr;
+ContentLUT* World::checkIndices(const fs::path& directory, 
+                                const Content* content) {
+    fs::path indicesFile = directory/fs::path("indices.json");
+    if (fs::is_regular_file(indicesFile)) {
+        return ContentLUT::create(indicesFile, content);
+    }
+    return nullptr;
 }
 
-Level* World::load(path directory,
+Level* World::load(fs::path directory,
                    EngineSettings& settings,
                    const Content* content,
-				   const std::vector<ContentPack>& packs) {
-	unique_ptr<World> world (new World(".", directory, 0, settings, content, packs));
-	auto& wfile = world->wfile;
+                   const std::vector<ContentPack>& packs) {
+    auto world = std::make_unique<World>(
+        ".", directory, 0, settings, content, packs
+    );
+    auto& wfile = world->wfile;
 
-	if (!wfile->readWorldInfo(world.get())) {
-		throw world_load_error("could not to find world.json");
-	}
+    if (!wfile->readWorldInfo(world.get())) {
+        throw world_load_error("could not to find world.json");
+    }
 
-	Player* player = new Player(vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
-	Level* level = new Level(world.get(), content, player, settings);
-	wfile->readPlayer(player);
+    Player* player = new Player(glm::vec3(0, DEF_PLAYER_Y, 0), DEF_PLAYER_SPEED);
+    Level* level = new Level(world.get(), content, player, settings);
+    wfile->readPlayer(player);
 
-	world.release();
-	return level;
+    world.release();
+    return level;
+}
+
+void World::setName(const std::string& name) {
+    this->name = name;
+}
+
+void World::setSeed(uint64_t seed) {
+    this->seed = seed;
+}
+
+std::string World::getName() const {
+    return name;
+}
+
+uint64_t World::getSeed() const {
+    return seed;
 }
 
 const std::vector<ContentPack>& World::getPacks() const {
-	return packs;
+    return packs;
 }
diff --git a/src/world/World.h b/src/world/World.h
index 6f2c7743..f3f22f0e 100644
--- a/src/world/World.h
+++ b/src/world/World.h
@@ -18,53 +18,61 @@ class Level;
 class Player;
 class ContentLUT;
 
+namespace fs = std::filesystem;
+
 class world_load_error : public std::runtime_error {
 public:
-	world_load_error(std::string message);
+    world_load_error(std::string message);
 };
 
 class World {
-	EngineSettings& settings;
-	const Content* const content;
-	std::vector<ContentPack> packs;
+    std::string name;
+    uint64_t seed;
+    EngineSettings& settings;
+    const Content* const content;
+    std::vector<ContentPack> packs;
 public:
-	std::string name;
-	WorldFiles* wfile;
-	uint64_t seed;
+    WorldFiles* wfile;
 
-	/* Day/night loop timer in range 0..1 
-	   0.0 - is midnight
-	   0.5 - is noon
-	*/
-	float daytime = timeutil::time_value(10, 00, 00);
-	float daytimeSpeed = 1.0f/60.0f/24.0f;
+    /* Day/night loop timer in range 0..1 
+       0.0 - is midnight
+       0.5 - is noon
+    */
+    float daytime = timeutil::time_value(10, 00, 00);
+    float daytimeSpeed = 1.0f/60.0f/24.0f;
+    double totalTime = 0.0;
 
-	World(std::string name, 
-		  std::filesystem::path directory, 
-		  uint64_t seed, 
-		  EngineSettings& settings,
-		  const Content* content,
-		  std::vector<ContentPack> packs);
-	~World();
+    World(std::string name, 
+          fs::path directory, 
+          uint64_t seed, 
+          EngineSettings& settings,
+          const Content* content,
+          std::vector<ContentPack> packs);
+    ~World();
 
-	void updateTimers(float delta);
-	void write(Level* level);
+    void updateTimers(float delta);
+    void write(Level* level);
 
-	static ContentLUT* checkIndices(const std::filesystem::path& directory,
-										 const Content* content);
+    static ContentLUT* checkIndices(const fs::path& directory,
+                                         const Content* content);
 
-	static Level* create(std::string name, 
-						 std::filesystem::path directory, 
-						 uint64_t seed, 
-						 EngineSettings& settings, 
-						 const Content* content,
-						 const std::vector<ContentPack>& packs);
-	static Level* load(std::filesystem::path directory,
-					   EngineSettings& settings,
-					   const Content* content,
-					   const std::vector<ContentPack>& packs);
-	
-	const std::vector<ContentPack>& getPacks() const;
+    static Level* create(std::string name, 
+                         fs::path directory, 
+                         uint64_t seed, 
+                         EngineSettings& settings, 
+                         const Content* content,
+                         const std::vector<ContentPack>& packs);
+    static Level* load(fs::path directory,
+                       EngineSettings& settings,
+                       const Content* content,
+                       const std::vector<ContentPack>& packs);
+
+    void setName(const std::string& name);
+    void setSeed(uint64_t seed);
+    
+    std::string getName() const;
+    uint64_t getSeed() const;
+    const std::vector<ContentPack>& getPacks() const;
 };
 
 #endif /* WORLD_WORLD_H_ */