Some quite aggressive commit... 😢

src/math/bounding_box.rs

@@ -80,6 +80,20 @@ macro_rules! make_bounding_box {
                 }
                 ret
             }
+
+            /// Returns the bounding box of the union of two bounding boxes.
+            pub fn union(&self, other: &$name<T>) -> $name<T> {
+                let mut ret = self.clone();
+                for i in 0..$size {
+                    if ret.min()[i] > other.min()[i] {
+                        ret.min_mut()[i] = other.min()[i];
+                    }
+                    if ret.max()[i] < other.max()[i] {
+                        ret.max_mut()[i] = other.max()[i];
+                    }
+                }
+                ret
+            }
         }
 
     }