diff --git a/main/Scene-load.cc b/main/Scene-load.cc
index 94e3ae6..03f864e 100644
--- a/main/Scene-load.cc
+++ b/main/Scene-load.cc
@@ -111,13 +111,33 @@ refptr<Material> processMaterial(refptr<Node> node)
     return material;
 }
 
-refptr<Shape> processShape(refptr<Node> node)
+refptr<Shape> processBox(refptr<Node> node)
 {
     /* TODO: finish */
+    return refptr<Shape>(NULL);
+}
+
+refptr<Shape> processCyl(refptr<Node> node)
+{
+    /* TODO: finish */
+    return refptr<Shape>(NULL);
 }
 
 refptr<Light> processLight(refptr<Node> node)
 {
     /* TODO: finish */
+    return refptr<Light>(NULL);
+}
+
+refptr<Shape> processPlane(refptr<Node> node)
+{
+    /* TODO: finish */
+    return refptr<Shape>(NULL);
+}
+
+refptr<Shape> processSphere(refptr<Node> node)
+{
+    /* TODO: finish */
+    return refptr<Shape>(NULL);
 }
 
diff --git a/main/Scene.h b/main/Scene.h
index 5953bc8..3c4d451 100644
--- a/main/Scene.h
+++ b/main/Scene.h
@@ -54,8 +54,11 @@ class Scene
         void processNode(refptr<Node> node);
         void processChildren(refptr<Node> node);
         refptr<Material> processMaterial(refptr<Node> node);
-        refptr<Shape> processShape(refptr<Node> node);
+        refptr<Shape> processBox(refptr<Node> node);
+        refptr<Shape> processCyl(refptr<Node> node);
         refptr<Light> processLight(refptr<Node> node);
+        refptr<Shape> processPlane(refptr<Node> node);
+        refptr<Shape> processSphere(refptr<Node> node);
 
         /* rendering parameters */
         int m_width;