diff --git a/TODO b/TODO
index e0aaa6b..86db336 100644
--- a/TODO
+++ b/TODO
@@ -40,7 +40,8 @@ Technology Preview 2 :
 
 Technology Preview 3 :
 - Restore render progress.
-- Add antialiasing option (pay attention to memory usage).
+- Use bicubic interpolation for antialiasing.
+- Improve large render/antialias memory consumption.
 - Add basic vegetation system ?
 - Texture shadowing and self-shadowing ?
 - Improve sky rendering (colors and light halo).
diff --git a/gui_qt/dialogrender.cpp b/gui_qt/dialogrender.cpp
index 6686de5..ee4c7f4 100644
--- a/gui_qt/dialogrender.cpp
+++ b/gui_qt/dialogrender.cpp
@@ -16,6 +16,7 @@ static void _renderStart(int width, int height, Color background)
     delete _current_dialog->pixbuf;
     _current_dialog->pixbuf = new QImage(width, height, QImage::Format_ARGB32);
     _current_dialog->pixbuf->fill(colorToQColor(background).rgb());
+    _current_dialog->tellRenderSize(width, height);
 }
 
 static void _renderDraw(int x, int y, Color col)
@@ -71,7 +72,7 @@ DialogRender::DialogRender(QWidget *parent, Renderer* renderer):
     _current_dialog = this;
     render_thread = NULL;
     _renderer = renderer;
-
+    
     setModal(true);
     setWindowTitle(tr("Paysages 3D - Render"));
     setLayout(new QVBoxLayout());
@@ -89,6 +90,8 @@ DialogRender::DialogRender(QWidget *parent, Renderer* renderer):
     layout()->addWidget(progress);
     progress_value = 0;
     
+    connect(this, SIGNAL(renderSizeChanged(int, int)), this, SLOT(applyRenderSize(int, int)));
+    
     // TEMP
     progress->hide();
 }
@@ -105,9 +108,14 @@ DialogRender::~DialogRender()
     delete pixbuf;
 }
 
+void DialogRender::tellRenderSize(int width, int height)
+{
+    emit renderSizeChanged(width, height);
+}
+
 void DialogRender::startRender(RenderParams params)
 {
-    applyRenderSize(params.width, params.height);
+    //applyRenderSize(params.width, params.height);
     rendererSetPreviewCallbacks(_renderer, _renderStart, _renderDraw, _renderUpdate);
 
     render_thread = new RenderThread(_renderer, params);
@@ -118,7 +126,7 @@ void DialogRender::startRender(RenderParams params)
 
 void DialogRender::loadLastRender()
 {
-    applyRenderSize(_renderer->render_width, _renderer->render_height);
+    //applyRenderSize(_renderer->render_width, _renderer->render_height);
     progress->hide();
     rendererSetPreviewCallbacks(_renderer, _renderStart, _renderDraw, _renderUpdate);
 
diff --git a/gui_qt/dialogrender.h b/gui_qt/dialogrender.h
index 2f2cf2b..4224aae 100644
--- a/gui_qt/dialogrender.h
+++ b/gui_qt/dialogrender.h
@@ -14,6 +14,7 @@ public:
     explicit DialogRender(QWidget *parent, Renderer* renderer);
     ~DialogRender();
 
+    void tellRenderSize(int width, int height);
     void startRender(RenderParams params);
     void loadLastRender();
 
@@ -22,8 +23,11 @@ public:
     QProgressBar* progress;
     int progress_value;
     
-public slots:
+private slots:
     void applyRenderSize(int width, int height);
+    
+signals:
+    void renderSizeChanged(int width, int height);
 
 private:
     QScrollArea* scroll;
diff --git a/i18n/paysages_fr.ts b/i18n/paysages_fr.ts
index 94229d5..52bb731 100644
--- a/i18n/paysages_fr.ts
+++ b/i18n/paysages_fr.ts
@@ -250,7 +250,7 @@ Maintenir Ctrl : Plus lent</translation>
 <context>
     <name>DialogRender</name>
     <message>
-        <location filename="../gui_qt/dialogrender.cpp" line="76"/>
+        <location filename="../gui_qt/dialogrender.cpp" line="77"/>
         <source>Paysages 3D - Render</source>
         <translation>Paysages 3D - Rendu</translation>
     </message>
diff --git a/lib_paysages/clouds.c b/lib_paysages/clouds.c
index 213a0ee..aa9abb0 100644
--- a/lib_paysages/clouds.c
+++ b/lib_paysages/clouds.c
@@ -288,10 +288,12 @@ static inline double _getDistanceToBorder(CloudsLayerDefinition* layer, Vector3
         density /= coverage;
         if (density < layer->edge_length)
         {
+            density /= layer->edge_length;
+            
             val = 0.5 * noiseGet3DTotal(layer->edge_noise, position.x / layer->edge_scaling, position.y / layer->edge_scaling, position.z / layer->edge_scaling) / noiseGetMaxValue(layer->edge_noise);
-            val = (val - 0.5 + density / layer->edge_length) * layer->edge_scaling;
+            val = val - 0.5 + density;
 
-            return val;
+            return val * (density * coverage * layer->shape_scaling + (1.0 - density) * layer->edge_scaling);
         }
         else
         {
diff --git a/lib_paysages/render.c b/lib_paysages/render.c
index f4cc3e2..9fe0020 100644
--- a/lib_paysages/render.c
+++ b/lib_paysages/render.c
@@ -226,25 +226,50 @@ static inline void _setDirtyPixel(RenderArea* area, Array* pixel_data, int x, in
     area->dirty_count++;
 }
 
-static void _processDirtyPixels(RenderArea* area)
+static inline Color _getFinalPixel(RenderArea* area, int x, int y)
 {
-    Color col;
+    Color result, col;
+    int sx, sy;
     Array* pixel_data;
-    int x, y;
-
-    for (y = area->dirty_down; y <= area->dirty_up; y++)
+    
+    result.r = result.g = result.b = 0.0;
+    result.a = 1.0;
+    for (sx = 0; sx < area->params.antialias; sx++)
     {
-        for (x = area->dirty_left; x <= area->dirty_right; x++)
+        for (sy = 0; sy < area->params.antialias; sy++)
         {
-            pixel_data = area->pixels + y * area->params.width * area->params.antialias + x;
-            if (pixel_data->dirty)
+            pixel_data = area->pixels + (y * area->params.antialias + sy) * area->params.width * area->params.antialias + (x * area->params.antialias + sx);
+            if (1 || pixel_data->dirty)
             {
                 col = _getPixelColor(area->background_color, pixel_data);
-                area->callback_draw(x, y, col);
+                result.r += col.r / (double)(area->params.antialias * area->params.antialias);
+                result.g += col.g / (double)(area->params.antialias * area->params.antialias);
+                result.b += col.b / (double)(area->params.antialias * area->params.antialias);
                 pixel_data->dirty = 0;
             }
         }
     }
+    
+    return result;
+}
+
+static void _processDirtyPixels(RenderArea* area)
+{
+    int x, y;
+    int down, up, left, right;
+    
+    down = area->dirty_down / area->params.antialias;
+    up = area->dirty_up / area->params.antialias;
+    left = area->dirty_left / area->params.antialias;
+    right = area->dirty_right / area->params.antialias;
+
+    for (y = down; y <= up; y++)
+    {
+        for (x = left; x <= right; x++)
+        {
+            area->callback_draw(x, y, _getFinalPixel(area, x, y));
+        }
+    }
 
     area->callback_update(0.0);
 
@@ -267,9 +292,9 @@ static void _setAllDirty(RenderArea* area)
     int x, y;
 
     area->dirty_left = 0;
-    area->dirty_right = area->params.width - 1;
+    area->dirty_right = area->params.width * area->params.antialias - 1;
     area->dirty_down = 0;
-    area->dirty_up = area->params.height - 1;
+    area->dirty_up = area->params.height * area->params.antialias - 1;
 
     for (y = area->dirty_down; y <= area->dirty_up; y++)
     {
@@ -765,9 +790,7 @@ int renderSaveToFile(RenderArea* area, const char* path)
     {
         for (x = 0; x < area->params.width; x++)
         {
-            /* TODO Anti-alias */
-            pixel_data = area->pixels + (y * area->params.width + x);
-            result = _getPixelColor(area->background_color, pixel_data);
+            result = _getFinalPixel(area, x, y);
             rgba = colorTo32BitRGBA(&result);
             data[y * area->params.width + x] = rgba;
         }