1 files changed, 2 insertions, 1 deletions
diff --git a/geometry.py b/geometry.py
index b2cb9c0..cccf516 100644
--- a/geometry.py
+++ b/geometry.py
@@ -194,7 +194,8 @@ def morton_order(mesh, bits):
     return interleave(mean_positions, bits)
 
 class Geometry(object):
-    def __init__(self):
+    def __init__(self, detector_material=None):
+        self.detector_material = detector_material
         self.solids = []
         self.solid_rotations = []
         self.solid_displacements = []