diff --git a/src/PostProcessing.cpp b/src/PostProcessing.cpp
index e829114..76fcee2 100644
--- a/src/PostProcessing.cpp
+++ b/src/PostProcessing.cpp
@@ -145,12 +145,12 @@ namespace itg
         pingPong[currentReadFbo].draw(630, 10, 300, 300);
     }
     
-    void PostProcessing::draw(float x, float y) const
+    void PostProcessing::draw(float x, float y)
     {
         draw(x, y, width, height);
     }
     
-    void PostProcessing::draw(float x, float y, float w, float h) const
+    void PostProcessing::draw(float x, float y, float w, float h)
     {
         if (flip)
         {
diff --git a/src/PostProcessing.h b/src/PostProcessing.h
index a6279e5..31e4ef5 100644
--- a/src/PostProcessing.h
+++ b/src/PostProcessing.h
@@ -47,8 +47,8 @@ namespace itg
         void end(bool autoDraw = true);
         
         // float rather than int and not const to override ofBaseDraws
-        void draw(float x = 0.f, float y = 0.f) const;
-        void draw(float x, float y, float w, float h) const;
+        void draw(float x = 0.f, float y = 0.f) ;
+        void draw(float x, float y, float w, float h) ;
         float getWidth() const { return width; }
         float getHeight() const { return height; }
         
@@ -80,6 +80,10 @@ namespace itg
         
         ofFbo& getRawRef() { return raw; }
         
+         float getHeight(){ return 0 ; };
+         float getWidth(){ return 0 ; };
+
+        
     private:
         void process();