From 6c78d129c3db8b09b0e8b21cb3a4965460127666 Mon Sep 17 00:00:00 2001
From: Patrick Shriwise <pshriwise@gmail.com>
Date: Tue, 12 Jul 2022 15:49:40 +0100
Subject: [PATCH] added bbox by @pshriwise

---
 openmc/universe.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/openmc/universe.py b/openmc/universe.py
index f3f95aebbe..bb1554de89 100644
--- a/openmc/universe.py
+++ b/openmc/universe.py
@@ -7,6 +7,7 @@ from pathlib import Path
 from tempfile import TemporaryDirectory
 from xml.etree import ElementTree as ET
 
+import h5py
 import numpy as np
 
 import openmc
@@ -630,6 +631,9 @@ class DAGMCUniverse(UniverseBase):
     auto_mat_ids : bool
         Set IDs automatically on initialization (True)  or report overlaps
         in ID space between OpenMC and UWUW materials (False)
+    bounding_box : 2-tuple of numpy.array
+        Lower-left and upper-right coordinates of an axis-aligned bounding box
+        of the universe.
     """
 
     def __init__(self,
@@ -650,6 +654,15 @@ class DAGMCUniverse(UniverseBase):
         string += '{: <16}=\t{}\n'.format('\tFile', self.filename)
         return string
 
+    @property
+    def bounding_box(self):
+        dagmc_file = h5py.File(self.filename)
+        coords = dagmc_file['tstt']['nodes']['coordinates'][()]
+        lower_left_corner = coords.min(axis=0)
+        upper_right_corner = coords.max(axis=0)
+        bounding_box = (lower_left_corner, upper_right_corner)
+        return bounding_box
+
     @property
     def filename(self):
         return self._filename