diff --git a/src/aabb.h b/src/aabb.h
index 408564f..0bdd8bd 100644
--- a/src/aabb.h
+++ b/src/aabb.h
@@ -4,5 +4,13 @@
 
 struct Aabb {
   vector3d max, min;
+  void Update(vector3d p) {
+    if(max.x < p.x) max.x = p.x;
+    if(max.y < p.y) max.y = p.y;
+    if(max.z < p.z) max.z = p.z;
+    if(min.x > p.x) min.x = p.x;
+    if(min.y > p.y) min.y = p.y;
+    if(min.z > p.z) min.z = p.z;
+  }
 };