diff -r 0133e565e072 -r 6da867fa5429 src/types/boundingbox.cpp
--- a/src/types/boundingbox.cpp	Wed Jan 01 17:45:56 2020 +0200
+++ b/src/types/boundingbox.cpp	Sun Jan 19 02:54:48 2020 +0200
@@ -39,24 +39,38 @@
  */
 double longestMeasure(const BoundingBox& box)
 {
-	double dx = box.minimum.x - box.maximum.x;
-	double dy = box.minimum.y - box.maximum.y;
-	double dz = box.minimum.z - box.maximum.z;
-	double size = std::max(std::max(dx, dy), dz);
-	return std::max(std::abs(size / 2.0), 1.0);
+	if (box != emptyBoundingBox)
+	{
+		double dx = box.minimum.x - box.maximum.x;
+		double dy = box.minimum.y - box.maximum.y;
+		double dz = box.minimum.z - box.maximum.z;
+		double size = std::max(std::max(dx, dy), dz);
+		return std::max(std::abs(size / 2.0), 1.0);
+	}
+	else
+	{
+		return 0.0;
+	}
 }
 
 
 /*
  * Yields the center of the bounding box.
  */
-Point3D center(const BoundingBox& box)
+Point3D boxCenter(const BoundingBox& box)
 {
-	return {
-		(box.minimum.x + box.maximum.x) / 2,
-		(box.minimum.y + box.maximum.y) / 2,
-		(box.minimum.z + box.maximum.z) / 2
-	};
+	if (box != emptyBoundingBox)
+	{
+		return {
+			(box.minimum.x + box.maximum.x) / 2,
+			(box.minimum.y + box.maximum.y) / 2,
+			(box.minimum.z + box.maximum.z) / 2
+		};
+	}
+	else
+	{
+		return origin;
+	}
 }
 
 /*
@@ -66,3 +80,13 @@
 {
 	return math::distance(box.minimum, box.maximum);
 }
+
+bool operator==(const BoundingBox &box_1, const BoundingBox &box_2)
+{
+	return box_1.minimum == box_2.minimum and box_1.maximum == box_2.maximum;
+}
+
+bool operator!=(const BoundingBox &box_1, const BoundingBox &box_2)
+{
+	return not (box_1 == box_2);
+}