--- a/include/octree.h	Thu May 15 19:15:57 2008 +0200
+++ b/include/octree.h	Mon May 19 22:59:04 2008 +0200
@@ -77,14 +77,23 @@
 	const int max_depth;
 	bool built;
 public:
+	/** default constructor,
+	 * maximum depth of tree is set to 10 */
 	Octree() : Container(), root(NULL), max_depth(10), built(false) {};
+
+	/** constructor
+	 * @param[in] maxdepth	maximum depth of the tree */
 	Octree(int maxdepth) : Container(), root(NULL), max_depth(maxdepth), built(false) {};
 	~Octree() { if (root) delete root; };
 	void addShape(const Shape* aShape) { Container::addShape(aShape); built = false; };
 	const Shape *nearest_intersection(const Shape *origin_shape, const Ray &ray,
 		Float &nearest_distance);
 	void optimize() { build(); };
+
+	/** build the octree
+	 * this is alias of optimize() */
 	void build();
+
 	void save(ostream &str, OctreeNode *node = NULL) {};
 	void load(istream &str, OctreeNode *node = NULL) {};
 };