diff --git a/src/render/software/Canvas.cpp b/src/render/software/Canvas.cpp
index 875b8fc..4e4e746 100644
--- a/src/render/software/Canvas.cpp
+++ b/src/render/software/Canvas.cpp
@@ -50,7 +50,9 @@ void Canvas::setSize(int width, int height)
             CanvasPortion *portion = new CanvasPortion(preview);
 
             portion->setSize((x == horizontal_portion_count - 1) ? width - done_width : portion_width,
-                             (y == vertical_portion_count - 1) ? height - done_height : portion_height);
+                             (y == vertical_portion_count - 1) ? height - done_height : portion_height,
+                             done_width,
+                             done_height);
 
             done_width += portion->getWidth();
             if (x == horizontal_portion_count - 1)
diff --git a/src/render/software/CanvasPortion.cpp b/src/render/software/CanvasPortion.cpp
index ff0b15e..193404a 100644
--- a/src/render/software/CanvasPortion.cpp
+++ b/src/render/software/CanvasPortion.cpp
@@ -16,6 +16,8 @@ CanvasPortion::CanvasPortion(CanvasPreview* preview):
 {
     width = 1;
     height = 1;
+    xoffset = 0;
+    yoffset = 0;
     pixels = NULL;
 }
 
@@ -50,10 +52,12 @@ void CanvasPortion::clear()
     }
 }
 
-void CanvasPortion::setSize(int width, int height)
+void CanvasPortion::setSize(int width, int height, int xoffset, int yoffset)
 {
     this->width = width;
     this->height = height;
+    this->xoffset = xoffset;
+    this->yoffset = yoffset;
 }
 
 void CanvasPortion::preparePixels()
@@ -66,6 +70,15 @@ void CanvasPortion::preparePixels()
     clear();
 }
 
+void CanvasPortion::discardPixels()
+{
+    if (pixels)
+    {
+        delete[] pixels;
+        pixels = NULL;
+    }
+}
+
 void CanvasPortion::pushFragment(int x, int y, const CanvasFragment &fragment)
 {
     CHECK_COORDINATES();
@@ -77,7 +90,7 @@ void CanvasPortion::pushFragment(int x, int y, const CanvasFragment &fragment)
 
     if (preview)
     {
-        preview->pushPixel(x, y, old_color, pixel.getComposite());
+        preview->pushPixel(xoffset + x, yoffset + y, old_color, pixel.getComposite());
     }
 }
 
@@ -99,6 +112,6 @@ void CanvasPortion::setColor(int x, int y, const Color &color)
 
     if (preview)
     {
-        preview->pushPixel(x, y, old_color, pixel.getComposite());
+        preview->pushPixel(xoffset + x, yoffset + y, old_color, pixel.getComposite());
     }
 }
diff --git a/src/render/software/CanvasPortion.h b/src/render/software/CanvasPortion.h
index 9d45f42..59d0153 100644
--- a/src/render/software/CanvasPortion.h
+++ b/src/render/software/CanvasPortion.h
@@ -21,17 +21,24 @@ public:
 
     inline int getWidth() const {return width;}
     inline int getHeight() const {return height;}
+    inline int getXOffset() const {return xoffset;}
+    inline int getYOffset() const {return yoffset;}
     int getFragmentCount(int x, int y) const;
     const CanvasFragment *getFrontFragment(int x, int y) const;
 
     void clear();
-    void setSize(int width, int height);
+    void setSize(int width, int height, int xoffset=0, int yoffset=0);
 
     /**
      * Prepare (allocate in memory) the pixels area.
      */
     void preparePixels();
 
+    /**
+     * Discard the memory used by pixels.
+     */
+    void discardPixels();
+
     /**
      * Add a fragment to the pixel located at (x, y).
      *
@@ -56,6 +63,8 @@ public:
 private:
     int width;
     int height;
+    int xoffset;
+    int yoffset;
     CanvasPixel *pixels;
     CanvasPreview* preview;
 };
diff --git a/src/render/software/CanvasPreview.cpp b/src/render/software/CanvasPreview.cpp
index cb63c03..f7cf1fc 100644
--- a/src/render/software/CanvasPreview.cpp
+++ b/src/render/software/CanvasPreview.cpp
@@ -108,7 +108,6 @@ void CanvasPreview::pushPixel(int real_x, int real_y, const Color &old_color, co
 
     lock->acquire();
 
-    // TODO Assert-check
     if (scaled)
     {
         x = round(real_x / factor_x);
@@ -120,6 +119,8 @@ void CanvasPreview::pushPixel(int real_x, int real_y, const Color &old_color, co
         y = real_y;
     }
 
+    // TODO Assert-check on x and y
+
     Color* pixel = pixels + (y * width + x);
     pixel->r = pixel->r - old_color.r / factor + new_color.r / factor;
     pixel->g = pixel->g - old_color.g / factor + new_color.g / factor;
diff --git a/src/render/software/Rasterizer.cpp b/src/render/software/Rasterizer.cpp
index 009d984..af9c6ff 100644
--- a/src/render/software/Rasterizer.cpp
+++ b/src/render/software/Rasterizer.cpp
@@ -48,33 +48,37 @@ void Rasterizer::pushProjectedTriangle(CanvasPortion *canvas, const Vector3 &pix
     double limit_width = (double)(canvas->getWidth() - 1);
     double limit_height = (double)(canvas->getHeight() - 1);
 
+    Vector3 canvas_offset(canvas->getXOffset(), canvas->getYOffset(), 0.0);
+    Vector3 dpixel1 = pixel1.sub(canvas_offset);
+    Vector3 dpixel2 = pixel2.sub(canvas_offset);
+    Vector3 dpixel3 = pixel3.sub(canvas_offset);
+
     /* Filter if outside screen */
-    if (pixel1.z < 1.0 || pixel2.z < 1.0 || pixel3.z < 1.0 || (pixel1.x < 0.0 && pixel2.x < 0.0 && pixel3.x < 0.0) || (pixel1.y < 0.0 && pixel2.y < 0.0 && pixel3.y < 0.0) || (pixel1.x > limit_width && pixel2.x > limit_width && pixel3.x > limit_width) || (pixel1.y > limit_height && pixel2.y > limit_height && pixel3.y > limit_height))
+    if (dpixel1.z < 1.0 || dpixel2.z < 1.0 || dpixel3.z < 1.0 || (dpixel1.x < 0.0 && dpixel2.x < 0.0 && dpixel3.x < 0.0) || (dpixel1.y < 0.0 && dpixel2.y < 0.0 && dpixel3.y < 0.0) || (dpixel1.x > limit_width && dpixel2.x > limit_width && dpixel3.x > limit_width) || (dpixel1.y > limit_height && dpixel2.y > limit_height && dpixel3.y > limit_height))
     {
         return;
     }
 
     /* Prepare vertices */
-    // FIXME Apply canvas portion offset
-    point1.pixel.x = pixel1.x;
-    point1.pixel.y = pixel1.y;
-    point1.pixel.z = pixel1.z;
+    point1.pixel.x = dpixel1.x;
+    point1.pixel.y = dpixel1.y;
+    point1.pixel.z = dpixel1.z;
     point1.location.x = location1.x;
     point1.location.y = location1.y;
     point1.location.z = location1.z;
     point1.client = client_id;
 
-    point2.pixel.x = pixel2.x;
-    point2.pixel.y = pixel2.y;
-    point2.pixel.z = pixel2.z;
+    point2.pixel.x = dpixel2.x;
+    point2.pixel.y = dpixel2.y;
+    point2.pixel.z = dpixel2.z;
     point2.location.x = location2.x;
     point2.location.y = location2.y;
     point2.location.z = location2.z;
     point2.client = client_id;
 
-    point3.pixel.x = pixel3.x;
-    point3.pixel.y = pixel3.y;
-    point3.pixel.z = pixel3.z;
+    point3.pixel.x = dpixel3.x;
+    point3.pixel.y = dpixel3.y;
+    point3.pixel.z = dpixel3.z;
     point3.location.x = location3.x;
     point3.location.y = location3.y;
     point3.location.z = location3.z;
diff --git a/src/render/software/SoftwareCanvasRenderer.cpp b/src/render/software/SoftwareCanvasRenderer.cpp
index fde61ee..41890c5 100644
--- a/src/render/software/SoftwareCanvasRenderer.cpp
+++ b/src/render/software/SoftwareCanvasRenderer.cpp
@@ -51,11 +51,20 @@ void SoftwareCanvasRenderer::render()
 
     prepare();
 
-    // TODO Iterate portions
-    CanvasPortion *portion = canvas->at(0, 0);
-    portion->preparePixels();
-    rasterize(portion, true);
-    postProcess(portion, true);
+    // Iterate portions
+    int nx = canvas->getHorizontalPortionCount();
+    int ny = canvas->getVerticalPortionCount();
+    for (int y = 0; y < ny; y++)
+    {
+        for (int x = 0; x < nx; x++)
+        {
+            CanvasPortion *portion = canvas->at(x, y);
+            portion->preparePixels();
+            rasterize(portion, true);
+            postProcess(portion, true);
+            portion->discardPixels();
+        }
+    }
 }
 
 const std::vector<Rasterizer *> &SoftwareCanvasRenderer::getRasterizers() const