diff --git a/src/noggit/MapChunk.cpp b/src/noggit/MapChunk.cpp
index 7ce52c79..77119e5c 100755
--- a/src/noggit/MapChunk.cpp
+++ b/src/noggit/MapChunk.cpp
@@ -1280,10 +1280,13 @@ int MapChunk::addTexture(scoped_blp_texture_reference texture)
   return texture_set->addTexture(std::move (texture));
 }
 
-void MapChunk::switchTexture(scoped_blp_texture_reference const& oldTexture, scoped_blp_texture_reference newTexture)
+bool MapChunk::switchTexture(scoped_blp_texture_reference const& oldTexture, scoped_blp_texture_reference newTexture)
 {
-  texture_set->replace_texture(oldTexture, std::move (newTexture));
-  registerChunkUpdate(ChunkUpdateFlags::ALPHAMAP);
+  bool changed = texture_set->replace_texture(oldTexture, std::move (newTexture));
+  if (changed)
+    registerChunkUpdate(ChunkUpdateFlags::ALPHAMAP);
+
+  return changed;
 }
 
 bool MapChunk::paintTexture(glm::vec3 const& pos, Brush* brush, float strength, float pressure, scoped_blp_texture_reference texture)
diff --git a/src/noggit/MapChunk.h b/src/noggit/MapChunk.h
index 03f62e10..3237ea09 100755
--- a/src/noggit/MapChunk.h
+++ b/src/noggit/MapChunk.h
@@ -160,7 +160,7 @@ public:
   bool replaceTexture(glm::vec3 const& pos, float radius, scoped_blp_texture_reference const& old_texture, scoped_blp_texture_reference new_texture, bool entire_chunk = false);
   bool canPaintTexture(scoped_blp_texture_reference texture);
   int addTexture(scoped_blp_texture_reference texture);
-  void switchTexture(scoped_blp_texture_reference const& oldTexture, scoped_blp_texture_reference newTexture);
+  bool switchTexture(scoped_blp_texture_reference const& oldTexture, scoped_blp_texture_reference newTexture);
   void eraseTextures();
   void eraseTexture(scoped_blp_texture_reference const& tex);
   void change_texture_flag(scoped_blp_texture_reference const& tex, std::size_t flag, bool add);
diff --git a/src/noggit/MapTile.cpp b/src/noggit/MapTile.cpp
index cadc4776..bee9975d 100755
--- a/src/noggit/MapTile.cpp
+++ b/src/noggit/MapTile.cpp
@@ -1049,7 +1049,7 @@ void MapTile::initEmptyChunks()
 
 QImage MapTile::getHeightmapImage(float min_height, float max_height)
 {
-  QImage image(257, 257, QImage::Format_RGBA64);
+    QImage image(257, 257, QImage::Format_Grayscale16);
 
   unsigned const LONG{9}, SHORT{8}, SUM{LONG + SHORT}, DSUM{SUM * 2};
 
@@ -1121,7 +1121,7 @@ QImage MapTile::getNormalmapImage()
 
 QImage MapTile::getAlphamapImage(unsigned layer)
 {
-  QImage image(1024, 1024, QImage::Format_RGBA8888);
+  QImage image(1024, 1024, QImage::Format_Grayscale8);
   image.fill(Qt::black);
 
   for (int i = 0; i < 16; ++i)
@@ -1154,7 +1154,7 @@ QImage MapTile::getAlphamapImage(unsigned layer)
 
 QImage MapTile::getAlphamapImage(std::string const& filename)
 {
-  QImage image(1024, 1024, QImage::Format_RGBA8888);
+  QImage image(1024, 1024, QImage::Format_Grayscale8);
   image.fill(Qt::black);
 
   for (int i = 0; i < 16; ++i)
@@ -1164,20 +1164,25 @@ QImage MapTile::getAlphamapImage(std::string const& filename)
       MapChunk *chunk = getChunk(i, j);
 
       unsigned layer = 0;
+      bool chunk_has_texture = false;
 
       for (int k = 0; k < chunk->texture_set->num(); ++k)
       {
-        if (chunk->texture_set->filename(k) == filename)
-          layer = k;
+          if (chunk->texture_set->filename(k) == filename)
+          {
+            layer = k;
+            chunk_has_texture = true;
+          }
       }
 
-      if (!layer)
+      if (!chunk_has_texture)
       {
         for (int k = 0; k < 64; ++k)
         {
           for (int l = 0; l < 64; ++l)
           {
-            image.setPixelColor((i * 64) + k, (j * 64) + l, QColor(255, 255, 255, 255));
+            // if texture is not in the chunk, set chunk to black
+            image.setPixelColor((i * 64) + k, (j * 64) + l, QColor(0, 0, 0, 255));
           }
         }
       }
@@ -1186,14 +1191,31 @@ QImage MapTile::getAlphamapImage(std::string const& filename)
         chunk->texture_set->apply_alpha_changes();
         auto alphamaps = chunk->texture_set->getAlphamaps();
 
-        auto alpha_layer = alphamaps->at(layer - 1).value();
-
         for (int k = 0; k < 64; ++k)
         {
           for (int l = 0; l < 64; ++l)
           {
-            int value = alpha_layer.getAlpha(64 * l + k);
-            image.setPixelColor((i * 64) + k, (j * 64) + l, QColor(value, value, value, 255));
+            if (layer == 0) // titi test
+            {
+              // WoW calculates layer 0 as 255 - sum(Layer[1]...Layer[3])
+              int layers_sum = 0;
+              if (alphamaps->at(0).has_value())
+                  layers_sum += alphamaps->at(0).value().getAlpha(64 * l + k);
+              if (alphamaps->at(1).has_value())
+                  layers_sum += alphamaps->at(1).value().getAlpha(64 * l + k);
+              if (alphamaps->at(2).has_value())
+                  layers_sum += alphamaps->at(2).value().getAlpha(64 * l + k);
+              
+              int value = std::clamp((255 - layers_sum), 0, 255);
+              image.setPixelColor((i * 64) + k, (j * 64) + l, QColor(value, value, value, 255));
+            }
+            else // layer 1-3
+            {
+              auto alpha_layer = alphamaps->at(layer - 1).value();
+
+              int value = alpha_layer.getAlpha(64 * l + k);
+              image.setPixelColor((i * 64) + k, (j * 64) + l, QColor(value, value, value, 255));
+            }
           }
         }
       }
@@ -1203,8 +1225,10 @@ QImage MapTile::getAlphamapImage(std::string const& filename)
   return std::move(image);
 }
 
-void MapTile::setHeightmapImage(QImage const& image, float multiplier, int mode, bool tiledEdges)
+void MapTile::setHeightmapImage(QImage const& baseimage, float multiplier, int mode, bool tiledEdges) // image
 {
+  auto image = baseimage.convertToFormat(QImage::Format_Grayscale16);
+
   unsigned const LONG{9}, SHORT{8}, SUM{LONG + SHORT}, DSUM{SUM * 2};
   for (int k = 0; k < 16; ++k)
   {
@@ -1353,8 +1377,10 @@ void MapTile::setHeightmapImage(QImage const& image, float multiplier, int mode,
   }
 }
 
-void MapTile::setAlphaImage(QImage const& image, unsigned layer)
+void MapTile::setAlphaImage(QImage const& baseimage, unsigned layer)
 {
+  auto image = baseimage.convertToFormat(QImage::Format_Grayscale8);
+
   for (int k = 0; k < 16; ++k)
   {
     for (int l = 0; l < 16; ++l)
@@ -1364,6 +1390,8 @@ void MapTile::setAlphaImage(QImage const& image, unsigned layer)
       if (layer >= chunk->texture_set->num())
         continue;
 
+      chunk->registerChunkUpdate(ChunkUpdateFlags::ALPHAMAP);
+
       chunk->texture_set->create_temporary_alphamaps_if_needed();
       auto& temp_alphamaps = chunk->texture_set->getTempAlphamaps()->value();
 
@@ -1420,8 +1448,10 @@ QImage MapTile::getVertexColorsImage()
   return std::move(image);
 }
 
-void MapTile::setVertexColorImage(QImage const& image, int mode, bool tiledEdges)
+void MapTile::setVertexColorImage(QImage const& baseimage, int mode, bool tiledEdges)
 {
+  QImage image = baseimage.convertToFormat(QImage::Format_RGBA8888);
+
   unsigned const LONG{9}, SHORT{8}, SUM{LONG + SHORT}, DSUM{SUM * 2};
 
   for (int k = 0; k < 16; ++k)
@@ -1430,6 +1460,8 @@ void MapTile::setVertexColorImage(QImage const& image, int mode, bool tiledEdges
     {
       MapChunk* chunk = getChunk(k, l);
 
+      chunk->registerChunkUpdate(ChunkUpdateFlags::MCCV);
+
       glm::vec3* colors = chunk->getVertexColors();
 
       for (unsigned y = 0; y < SUM; ++y)
@@ -1554,9 +1586,6 @@ void MapTile::setVertexColorImage(QImage const& image, int mode, bool tiledEdges
   }
 }
 
-
-
-
 void MapTile::recalcExtents()
 {
   if (!_extents_dirty)
diff --git a/src/noggit/MapTile.h b/src/noggit/MapTile.h
index bb04538d..0e8c5d8b 100755
--- a/src/noggit/MapTile.h
+++ b/src/noggit/MapTile.h
@@ -141,7 +141,7 @@ public:
   QImage getAlphamapImage(std::string const& filename);
   QImage getVertexColorsImage();
   QImage getNormalmapImage();
-  void setHeightmapImage(QImage const& image, float multiplier, int mode, bool tiledEdges);
+  void setHeightmapImage(QImage const& baseimage, float multiplier, int mode, bool tiledEdges);
   void setAlphaImage(QImage const& image, unsigned layer);
   void setVertexColorImage(QImage const& image, int mode, bool tiledEdges);
   void registerChunkUpdate(unsigned flags) { _chunk_update_flags |= flags; };
diff --git a/src/noggit/MapView.cpp b/src/noggit/MapView.cpp
index eb039871..2fbc2fba 100755
--- a/src/noggit/MapView.cpp
+++ b/src/noggit/MapView.cpp
@@ -1826,7 +1826,7 @@ void MapView::setupAssistMenu()
         (
             makeCurrent();
             OpenGL::context::scoped_setter const _(::gl, context());
-            NOGGIT_ACTION_MGR->beginAction(this, Noggit::ActionFlags::eCHUNKS_TEXTURE);
+            NOGGIT_ACTION_MGR->beginAction(this, Noggit::ActionFlags::eCHUNKS_TERRAIN);
             _world->importAllADTsHeightmaps(adt_import_height_params_multiplier->value(), adt_import_height_params_mode->currentIndex(), adt_import_height_tiled_edges->isChecked());
             NOGGIT_ACTION_MGR->endAction();
         )
@@ -1845,7 +1845,7 @@ void MapView::setupAssistMenu()
       (
           makeCurrent();
           OpenGL::context::scoped_setter const _(::gl, context());
-          NOGGIT_ACTION_MGR->beginAction(this, Noggit::ActionFlags::eCHUNKS_TEXTURE);
+          NOGGIT_ACTION_MGR->beginAction(this, Noggit::ActionFlags::eCHUNKS_VERTEX_COLOR);
           _world->importAllADTVertexColorMaps(adt_import_vcol_params_mode->currentIndex(), adt_import_vcol_params_mode_tiled_edges->isChecked());
           NOGGIT_ACTION_MGR->endAction();
       )
diff --git a/src/noggit/World.cpp b/src/noggit/World.cpp
index 9cb564df..0eac6311 100755
--- a/src/noggit/World.cpp
+++ b/src/noggit/World.cpp
@@ -2278,6 +2278,51 @@ void World::swapTexture(glm::vec3 const& pos, scoped_blp_texture_reference tex)
   }
 }
 
+void World::swapTextureGlobal(scoped_blp_texture_reference tex)
+{
+    ZoneScoped;
+    if (!!Noggit::Ui::selected_texture::get())
+    {
+
+        for (size_t z = 0; z < 64; z++)
+        {
+            for (size_t x = 0; x < 64; x++)
+            {
+                TileIndex tile(x, z);
+
+                bool unload = !mapIndex.tileLoaded(tile) && !mapIndex.tileAwaitingLoading(tile);
+                MapTile* mTile = mapIndex.loadTile(tile);
+
+                if (mTile)
+                {
+                    mTile->wait_until_loaded();
+
+                    bool tile_changed = false;
+                    for_all_chunks_on_tile(mTile, [&](MapChunk* chunk)
+                    {
+                        // NOGGIT_CUR_ACTION->registerChunkTextureChange(chunk);
+                        bool swapped = chunk->switchTexture(tex, *Noggit::Ui::selected_texture::get());
+                        if (swapped)
+                            tile_changed = true;
+                    });
+
+                    if (tile_changed)
+                    {
+                        mTile->saveTile(this);
+                        mapIndex.markOnDisc(tile, true);
+                        mapIndex.unsetChanged(tile);
+                    }
+
+                    if (unload)
+                    {
+                        mapIndex.unloadTile(tile);
+                    }
+                }
+            }
+        }
+    }
+}
+
 void World::removeTexture(glm::vec3 const& pos, scoped_blp_texture_reference tex)
 {
     ZoneScoped;
diff --git a/src/noggit/World.h b/src/noggit/World.h
index 3bec7db9..cc17d9a4 100755
--- a/src/noggit/World.h
+++ b/src/noggit/World.h
@@ -197,6 +197,9 @@ public:
   template<typename Fun>
     void for_all_chunks_on_tile (glm::vec3 const& pos, Fun&&);
 
+    template<typename Fun>
+    void for_all_chunks_on_tile(MapTile* tile, Fun&& fun);
+
   template<typename Fun>
     void for_chunk_at(glm::vec3 const& pos, Fun&& fun);
   template<typename Fun>
@@ -228,6 +231,7 @@ public:
   void clear_shadows(glm::vec3 const& pos);
   void clearTextures(glm::vec3 const& pos);
   void swapTexture(glm::vec3 const& pos, scoped_blp_texture_reference tex);
+  void swapTextureGlobal(scoped_blp_texture_reference tex);
   void removeTexture(glm::vec3 const& pos, scoped_blp_texture_reference tex);
   void removeTexDuplicateOnADT(glm::vec3 const& pos);
   void change_texture_flag(glm::vec3 const& pos, scoped_blp_texture_reference const& tex, std::size_t flag, bool add);
diff --git a/src/noggit/World.inl b/src/noggit/World.inl
index 4b50f0b9..aa258ee1 100755
--- a/src/noggit/World.inl
+++ b/src/noggit/World.inl
@@ -25,6 +25,23 @@ void World::for_all_chunks_on_tile (glm::vec3 const& pos, Fun&& fun)
   }
 }
 
+template<typename Fun>
+void World::for_all_chunks_on_tile(MapTile* tile, Fun&& fun)
+{
+    if (tile && tile->finishedLoading())
+    {
+        mapIndex.setChanged(tile);
+
+        for (size_t ty = 0; ty < 16; ++ty)
+        {
+            for (size_t tx = 0; tx < 16; ++tx)
+            {
+                fun(tile->getChunk(ty, tx));
+            }
+        }
+    }
+}
+
 template<typename Fun>
 void World::for_chunk_at(glm::vec3 const& pos, Fun&& fun)
 {
diff --git a/src/noggit/map_horizon.cpp b/src/noggit/map_horizon.cpp
index 68afb944..b70abf7e 100755
--- a/src/noggit/map_horizon.cpp
+++ b/src/noggit/map_horizon.cpp
@@ -189,13 +189,15 @@ map_horizon::map_horizon(const std::string& basename, const MapIndex * const ind
             wdl_file.read(_tiles[y][x]->height_17, 17 * 17 * sizeof(int16_t));
             wdl_file.read(_tiles[y][x]->height_16, 16 * 16 * sizeof(int16_t));
 
-
-            wdl_file.read(&fourcc, 4);
-            if (fourcc == 'MAHO')
+            if (wdl_file.getPos() < wdl_file.getSize())
             {
-                wdl_file.read(&size, 4);
-                assert(size == 0x20);
-                wdl_file.read(_tiles[y][x]->holes, 16 * sizeof(int16_t));
+                wdl_file.read(&fourcc, 4);
+                if (fourcc == 'MAHO')
+                {
+                    wdl_file.read(&size, 4);
+                    assert(size == 0x20);
+                    wdl_file.read(_tiles[y][x]->holes, 16 * sizeof(int16_t));
+                }
             }
 
           }
diff --git a/src/noggit/map_index.cpp b/src/noggit/map_index.cpp
index 624212bc..130d44bd 100755
--- a/src/noggit/map_index.cpp
+++ b/src/noggit/map_index.cpp
@@ -1098,6 +1098,13 @@ void MapIndex::loadMinimapMD5translate()
 
     QStringList line_split = line.split(QRegExp("[\t]"));
 
+    if (line_split.length() < 2)
+    {
+        std::string text = "Failed to read md5translate.trs.\nLine \"" + line.toStdString() + "\n has no tab spacing. Spacing must be only a tab character and not spaces.";
+        LogError << text << std::endl;
+        throw  std::logic_error(text);
+    }
+
     if (cur_dir.length())
     {
       _minimap_md5translate[cur_dir.toStdString()][line_split[0].toStdString()] = line_split[1].toStdString();
diff --git a/src/noggit/texture_set.cpp b/src/noggit/texture_set.cpp
index 17630741..cf76b965 100755
--- a/src/noggit/texture_set.cpp
+++ b/src/noggit/texture_set.cpp
@@ -87,7 +87,7 @@ int TextureSet::addTexture (scoped_blp_texture_reference texture)
   return texLevel;
 }
 
-void TextureSet::replace_texture (scoped_blp_texture_reference const& texture_to_replace, scoped_blp_texture_reference replacement_texture)
+bool TextureSet::replace_texture (scoped_blp_texture_reference const& texture_to_replace, scoped_blp_texture_reference replacement_texture)
 {
   int texture_to_replace_level = -1, replacement_texture_level = -1;
 
@@ -122,6 +122,11 @@ void TextureSet::replace_texture (scoped_blp_texture_reference const& texture_to
       // merge_layers(texture_to_replace_level, replacement_texture_level);
     }
   }
+
+  if (texture_to_replace_level != -1 || replacement_texture_level != -1)
+      return true;
+  else
+      return false;
 }
 
 void TextureSet::swap_layers(int layer_1, int layer_2)
diff --git a/src/noggit/texture_set.hpp b/src/noggit/texture_set.hpp
index 3e576836..0f58104a 100755
--- a/src/noggit/texture_set.hpp
+++ b/src/noggit/texture_set.hpp
@@ -45,7 +45,7 @@ public:
   // return true if at least 1 texture has been erased
   bool eraseUnusedTextures();
   void swap_layers(int layer_1, int layer_2);
-  void replace_texture(scoped_blp_texture_reference const& texture_to_replace, scoped_blp_texture_reference replacement_texture);
+  bool replace_texture(scoped_blp_texture_reference const& texture_to_replace, scoped_blp_texture_reference replacement_texture);
   bool paintTexture(float xbase, float zbase, float x, float z, Brush* brush, float strength, float pressure, scoped_blp_texture_reference texture);
   bool stampTexture(float xbase, float zbase, float x, float z, Brush* brush, float strength, float pressure, scoped_blp_texture_reference texture, QImage* image, bool paint);
   bool replace_texture( float xbase
diff --git a/src/noggit/ui/texture_swapper.cpp b/src/noggit/ui/texture_swapper.cpp
index 7b4b2718..6465a673 100755
--- a/src/noggit/ui/texture_swapper.cpp
+++ b/src/noggit/ui/texture_swapper.cpp
@@ -36,12 +36,14 @@ namespace Noggit
 
       QPushButton* select = new QPushButton("Select", this);
       QPushButton* swap_adt = new QPushButton("Swap ADT", this);
+      QPushButton* swap_global = new QPushButton("Swap Global(All ADTs)", this);
       QPushButton* remove_text_adt = new QPushButton(tr("Remove this texture from ADT"), this);
 
       layout->addRow(new QLabel("Texture to swap"));
       layout->addRow(_texture_to_swap_display);
       layout->addRow(select);
       layout->addRow(swap_adt);
+      layout->addRow(swap_global);
       layout->addRow(remove_text_adt);
 
       _brush_mode_group = new QGroupBox("Brush mode", this);
@@ -89,6 +91,14 @@ namespace Noggit
         }
       });
 
+      connect(swap_global, &QPushButton::clicked, [this, camera_pos, map_view]() {
+          if (_texture_to_swap)
+          {
+            // TODO : action manager
+              _world->swapTextureGlobal(_texture_to_swap.value());
+          }
+          });
+
       connect(remove_text_adt, &QPushButton::clicked, [this, camera_pos, map_view]() {
           if (_texture_to_swap)
           {