--- a/src/scene.h	Sun Nov 18 11:20:56 2007 +0100
+++ b/src/scene.h	Thu Nov 22 17:53:34 2007 +0100
@@ -16,6 +16,15 @@
 
 using namespace std;
 
+/* axis-aligned bounding box */
+class BBox
+{
+public:
+	Vector3 L;
+	Vector3 R;
+	BBox(): L(), R() {};
+};
+
 class Ray
 {
 public:
@@ -84,6 +93,8 @@
 
 	// normal at point P
 	virtual Vector3 normal(Vector3 &P) = 0;
+
+	virtual BBox get_bbox();
 };
 
 class Sphere: public Shape
@@ -130,6 +141,7 @@
 	bool intersect(const Ray &ray, float &dist);
 	bool intersect_all(const Ray &ray, float dist, vector<float> &allts) {return false;};
 	Vector3 normal(Vector3 &) { return N; };
+	BBox get_bbox();
 };
 
 #endif