--- a/include/raytracer.h	Thu Apr 24 18:12:32 2008 +0200
+++ b/include/raytracer.h	Sun Apr 27 09:44:49 2008 +0200
@@ -67,9 +67,9 @@
 	pthread_mutex_t sample_queue_mutex, sampler_mutex;
 	pthread_cond_t sample_queue_cond, worker_ready_cond;
 
-	Colour shader_evalulate(Ray &ray, int depth, Shape *origin_shape,
+	Colour shader_evalulate(const Ray &ray, int depth, Shape *origin_shape,
 		Float nearest_distance, Shape *nearest_shape);
-	void raytracePacket(Ray *rays, Colour *results);
+	void raytracePacket(RayPacket &rays, Colour *results);
 	static void *raytrace_worker(void *d);
 public:
 	Raytracer(): top(NULL), camera(NULL), lights(), bg_colour(0., 0., 0.),