--- a/src/scene.h	Sun Nov 25 15:50:01 2007 +0100
+++ b/src/scene.h	Sun Nov 25 17:58:29 2007 +0100
@@ -19,9 +19,9 @@
 class Ray
 {
 public:
-	Vector3 a, dir;
-	Ray(const Vector3 &aa, const Vector3 &adir):
-		a(aa), dir(adir) {};
+	Vector3 o, dir;
+	Ray(const Vector3 &ao, const Vector3 &adir):
+		o(ao), dir(adir) {};
 };
 
 /* axis-aligned bounding box */