diff --git a/src/render/software/CanvasPixelShader.cpp b/src/render/software/CanvasPixelShader.cpp
index 318d071..f1362aa 100644
--- a/src/render/software/CanvasPixelShader.cpp
+++ b/src/render/software/CanvasPixelShader.cpp
@@ -31,6 +31,11 @@ int CanvasPixelShader::processParallelUnit(int unit)
     {
         for (int y = 0; y < limit_y; y += sub_chunk_size)
         {
+            if (interrupted)
+            {
+                return 0;
+            }
+
             if (sub_chunk_size == chunk_size or x % prev_sub_chunk_size != 0 or y % prev_sub_chunk_size != 0)
             {
                 // Resolve the pixel color
diff --git a/src/render/software/CanvasPixelShader.h b/src/render/software/CanvasPixelShader.h
index ce321c1..c5fe190 100644
--- a/src/render/software/CanvasPixelShader.h
+++ b/src/render/software/CanvasPixelShader.h
@@ -20,7 +20,7 @@ class CanvasPixelShader: public ParallelWorker
 public:
     CanvasPixelShader(const SoftwareCanvasRenderer &renderer, CanvasPortion *portion, int chunk_size, int sub_chunk_size, int chunks_x, int chunks_y);
 
-    virtual int processParallelUnit(int unit);
+    virtual int processParallelUnit(int unit) override;
 
 private:
     const SoftwareCanvasRenderer &renderer;
diff --git a/src/render/software/Rasterizer.cpp b/src/render/software/Rasterizer.cpp
index af9c6ff..a4e6067 100644
--- a/src/render/software/Rasterizer.cpp
+++ b/src/render/software/Rasterizer.cpp
@@ -35,6 +35,8 @@ Rasterizer::Rasterizer(SoftwareRenderer* renderer, int client_id, const Color &c
     renderer(renderer), client_id(client_id)
 {
     this->color = new Color(color);
+
+    interrupted = false;
 }
 
 Rasterizer::~Rasterizer()
@@ -42,6 +44,11 @@ Rasterizer::~Rasterizer()
     delete color;
 }
 
+void Rasterizer::interrupt()
+{
+    interrupted = true;
+}
+
 void Rasterizer::pushProjectedTriangle(CanvasPortion *canvas, const Vector3 &pixel1, const Vector3 &pixel2, const Vector3 &pixel3, const Vector3 &location1, const Vector3 &location2, const Vector3 &location3)
 {
     ScanPoint point1, point2, point3;
diff --git a/src/render/software/Rasterizer.h b/src/render/software/Rasterizer.h
index e364df6..a4157e8 100644
--- a/src/render/software/Rasterizer.h
+++ b/src/render/software/Rasterizer.h
@@ -22,6 +22,7 @@ public:
 
     virtual void rasterizeToCanvas(CanvasPortion* canvas) = 0;
     virtual Color shadeFragment(const CanvasFragment &fragment) const = 0;
+    virtual void interrupt();
 
 protected:
     void pushProjectedTriangle(CanvasPortion *canvas, const Vector3 &pixel1, const Vector3 &pixel2, const Vector3 &pixel3, const Vector3 &location1, const Vector3 &location2, const Vector3 &location3);
@@ -34,6 +35,7 @@ protected:
     Color* color;
     SoftwareRenderer *renderer;
     int client_id;
+    bool interrupted;
 
 private:
     void scanGetDiff(ScanPoint *v1, ScanPoint *v2, ScanPoint *result);
diff --git a/src/render/software/SkyRasterizer.h b/src/render/software/SkyRasterizer.h
index 89436b9..39b09ab 100644
--- a/src/render/software/SkyRasterizer.h
+++ b/src/render/software/SkyRasterizer.h
@@ -13,8 +13,8 @@ class SOFTWARESHARED_EXPORT SkyRasterizer: public Rasterizer
 public:
     SkyRasterizer(SoftwareRenderer* renderer, int client_id);
 
-    virtual void rasterizeToCanvas(CanvasPortion* canvas);
-    virtual Color shadeFragment(const CanvasFragment &fragment) const;
+    virtual void rasterizeToCanvas(CanvasPortion* canvas) override;
+    virtual Color shadeFragment(const CanvasFragment &fragment) const override;
 };
 
 }
diff --git a/src/render/software/SoftwareCanvasRenderer.cpp b/src/render/software/SoftwareCanvasRenderer.cpp
index 41890c5..9fdda8f 100644
--- a/src/render/software/SoftwareCanvasRenderer.cpp
+++ b/src/render/software/SoftwareCanvasRenderer.cpp
@@ -19,6 +19,8 @@ SoftwareCanvasRenderer::SoftwareCanvasRenderer()
     rasterizers.push_back(new SkyRasterizer(this, 0));
     rasterizers.push_back(new WaterRasterizer(this, 1));
     rasterizers.push_back(new TerrainRasterizer(this, 2));
+
+    current_work = NULL;
 }
 
 SoftwareCanvasRenderer::~SoftwareCanvasRenderer()
@@ -59,14 +61,33 @@ void SoftwareCanvasRenderer::render()
         for (int x = 0; x < nx; x++)
         {
             CanvasPortion *portion = canvas->at(x, y);
-            portion->preparePixels();
-            rasterize(portion, true);
-            postProcess(portion, true);
+
+            if (not render_interrupt)
+            {
+                portion->preparePixels();
+                rasterize(portion, true);
+            }
+
+            if (not render_interrupt)
+            {
+                applyPixelShader(portion, true);
+            }
+
             portion->discardPixels();
         }
     }
 }
 
+void SoftwareCanvasRenderer::interrupt()
+{
+    SoftwareRenderer::interrupt();
+
+    if (current_work)
+    {
+        current_work->interrupt();
+    }
+}
+
 const std::vector<Rasterizer *> &SoftwareCanvasRenderer::getRasterizers() const
 {
     return rasterizers;
@@ -85,7 +106,7 @@ void SoftwareCanvasRenderer::rasterize(CanvasPortion *portion, bool threaded)
     }
 }
 
-void SoftwareCanvasRenderer::postProcess(CanvasPortion *portion, bool threaded)
+void SoftwareCanvasRenderer::applyPixelShader(CanvasPortion *portion, bool threaded)
 {
     // Subdivide in chunks
     int chunk_size = 64;
@@ -96,8 +117,16 @@ void SoftwareCanvasRenderer::postProcess(CanvasPortion *portion, bool threaded)
     // Render chunks in parallel
     for (int sub_chunk_size = chunk_size; sub_chunk_size >= 1; sub_chunk_size /= 2)
     {
+        if (render_interrupt)
+        {
+            break;
+        }
+
         CanvasPixelShader shader(*this, portion, chunk_size, sub_chunk_size, chunks_x, chunks_y);
         ParallelWork work(&shader, units);
+
+        current_work = &work;
         work.perform();
+        current_work = NULL;
     }
 }
diff --git a/src/render/software/SoftwareCanvasRenderer.h b/src/render/software/SoftwareCanvasRenderer.h
index e18f150..93cf0cb 100644
--- a/src/render/software/SoftwareCanvasRenderer.h
+++ b/src/render/software/SoftwareCanvasRenderer.h
@@ -36,6 +36,8 @@ public:
      */
     void render();
 
+    virtual void interrupt() override;
+
     /**
      * @brief Get the list of objects that can be rasterized to polygons on a canvas.
      */
@@ -52,19 +54,21 @@ protected:
      *
      * If 'threaded' is true, the rasterization will take advantage of multiple CPU cores.
      */
-    void rasterize(CanvasPortion* portion, bool threaded);
+    void rasterize(CanvasPortion *portion, bool threaded=false);
 
     /**
-     * @brief Apply post-processing to fragments stored in the CanvasPortion.
+     * @brief Apply pixel shader to fragments stored in the CanvasPortion.
      *
-     * If 'threaded' is true, the post-processing will take advantage of multiple CPU cores.
+     * If 'threaded' is true, the shader will take advantage of multiple CPU cores.
      */
-    void postProcess(CanvasPortion* portion, bool threaded=true);
+    void applyPixelShader(CanvasPortion *portion, bool threaded=true);
 
 private:
-    Canvas* canvas;
+    Canvas *canvas;
     std::vector<Rasterizer*> rasterizers;
     bool started;
+
+    ParallelWork *current_work;
 };
 
 }
diff --git a/src/render/software/SoftwareRenderer.h b/src/render/software/SoftwareRenderer.h
index 04f8ded..cb6b278 100644
--- a/src/render/software/SoftwareRenderer.h
+++ b/src/render/software/SoftwareRenderer.h
@@ -67,7 +67,7 @@ public:
     void disableAtmosphere();
     void disableAtmosphere(const std::vector<LightComponent> &lights);
 
-    void interrupt();
+    virtual void interrupt();
 
     inline Scenery* getScenery() const {return scenery;}
 
diff --git a/src/render/software/TerrainRasterizer.cpp b/src/render/software/TerrainRasterizer.cpp
index ac0afdf..c0713a4 100644
--- a/src/render/software/TerrainRasterizer.cpp
+++ b/src/render/software/TerrainRasterizer.cpp
@@ -226,10 +226,6 @@ int TerrainRasterizer::processChunk(CanvasPortion* canvas, TerrainChunkInfo* chu
     return !renderer->render_interrupt;
 }
 
-void TerrainRasterizer::rasterize()
-{
-}
-
 void TerrainRasterizer::rasterizeToCanvas(CanvasPortion *canvas)
 {
     queue = new ParallelQueue();
diff --git a/src/render/software/TerrainRasterizer.h b/src/render/software/TerrainRasterizer.h
index 0e6537f..0ae3d7b 100644
--- a/src/render/software/TerrainRasterizer.h
+++ b/src/render/software/TerrainRasterizer.h
@@ -43,15 +43,8 @@ public:
 
     void renderQuad(CanvasPortion* canvas, double x, double z, double size, double water_height);
 
-    /**
-     * Start the final rasterization of terrain.
-     *
-     * This will push the rasterized quads in the render area, waiting for post process.
-     */
-    virtual void rasterize();
-
-    virtual void rasterizeToCanvas(CanvasPortion* canvas);
-    virtual Color shadeFragment(const CanvasFragment &fragment) const;
+    virtual void rasterizeToCanvas(CanvasPortion* canvas) override;
+    virtual Color shadeFragment(const CanvasFragment &fragment) const override;
 
 private:
     ParallelQueue* queue;
diff --git a/src/render/software/WaterRasterizer.h b/src/render/software/WaterRasterizer.h
index 902d179..4d587ae 100644
--- a/src/render/software/WaterRasterizer.h
+++ b/src/render/software/WaterRasterizer.h
@@ -15,8 +15,8 @@ public:
 
     void rasterizeQuad(CanvasPortion* canvas, double x, double z, double size);
 
-    virtual void rasterizeToCanvas(CanvasPortion* canvas);
-    virtual Color shadeFragment(const CanvasFragment &fragment) const;
+    virtual void rasterizeToCanvas(CanvasPortion* canvas) override;
+    virtual Color shadeFragment(const CanvasFragment &fragment) const override;
 };
 
 }
diff --git a/src/system/ParallelWork.cpp b/src/system/ParallelWork.cpp
index c77aca3..24a6096 100644
--- a/src/system/ParallelWork.cpp
+++ b/src/system/ParallelWork.cpp
@@ -172,6 +172,11 @@ int ParallelWork::perform(int thread_count)
     return done;
 }
 
+void ParallelWork::interrupt()
+{
+    worker->interrupt();
+}
+
 void ParallelWork::returnThread(ParallelWork::ParallelThread *thread)
 {
     mutex->acquire();
diff --git a/src/system/ParallelWork.h b/src/system/ParallelWork.h
index 3e6d923..f1b6133 100644
--- a/src/system/ParallelWork.h
+++ b/src/system/ParallelWork.h
@@ -48,6 +48,13 @@ public:
      */
     int perform(int thread_count=-1);
 
+    /**
+     * Tell the threads to interrupt what they are doing.
+     *
+     * This will also call interrupt() on the worker.
+     */
+    void interrupt();
+
 private:
     void returnThread(ParallelThread *thread);
 
diff --git a/src/system/ParallelWorker.cpp b/src/system/ParallelWorker.cpp
index 0e64c57..d08dc7b 100644
--- a/src/system/ParallelWorker.cpp
+++ b/src/system/ParallelWorker.cpp
@@ -2,8 +2,14 @@
 
 ParallelWorker::ParallelWorker()
 {
+    interrupted = false;
 }
 
 ParallelWorker::~ParallelWorker()
 {
 }
+
+void ParallelWorker::interrupt()
+{
+    interrupted = true;
+}
diff --git a/src/system/ParallelWorker.h b/src/system/ParallelWorker.h
index b77f08c..2b90518 100644
--- a/src/system/ParallelWorker.h
+++ b/src/system/ParallelWorker.h
@@ -21,6 +21,14 @@ public:
      * This method will be called from any thread in the thread pool used by the ParallelWork.
      */
     virtual int processParallelUnit(int unit) = 0;
+
+    /**
+     * Method to reimplement to know when to interrupt the processing of units.
+     */
+    virtual void interrupt();
+
+protected:
+    bool interrupted;
 };
 
 }