--- a/include/container.h	Thu May 08 09:21:25 2008 +0200
+++ b/include/container.h	Sat May 10 14:29:37 2008 +0200
@@ -47,20 +47,20 @@
 	Container(): bbox(), shapes() {};
 	virtual ~Container() {};
 
-	virtual void addShape(Shape* aShape);
-	//void addShapeNoExtend(Shape* aShape) { shapes.push_back(aShape); };
-	virtual Shape *nearest_intersection(const Shape *origin_shape, const Ray &ray,
+	virtual void addShape(const Shape* aShape);
+	//void addShapeNoExtend(const Shape* aShape) { shapes.push_back(aShape); };
+	virtual const Shape *nearest_intersection(const Shape *origin_shape, const Ray &ray,
 		Float &nearest_distance);
 
 	virtual void optimize() {};
 
 	ShapeList & getShapes() { return shapes; };
 
-	virtual ostream & dump(ostream &st);
+	virtual ostream & dump(ostream &st) const;
 
 #ifndef NO_SIMD
 	virtual void packet_intersection(const Shape* const* origin_shapes, const RayPacket &rays,
-		Float *nearest_distances, Shape** nearest_shapes);
+		Float *nearest_distances, const Shape** nearest_shapes);
 #endif
 };