From db991482813df3db5620da530d66cc6f40d568ff Mon Sep 17 00:00:00 2001
From: Patrick Shriwise <pshriwise@gmail.com>
Date: Wed, 20 May 2020 12:40:00 -0500
Subject: [PATCH] Adding early return if the cell is filled with a material.

---
 src/cell.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cell.cpp b/src/cell.cpp
index 08476d31f..431d40b32 100644
--- a/src/cell.cpp
+++ b/src/cell.cpp
@@ -1180,7 +1180,10 @@ Cell::get_contained_cells() {
   std::unordered_map<int32_t, std::vector<int32_t>> contained_cells;
   std::vector<ParentCell> parent_cells;
 
-  this->get_contained_cells_inner(contained_cells, parent_cells);
+  // if this cell is filled w/ a material, it contains no other cells
+  if (type_ != Fill::MATERIAL) {
+    this->get_contained_cells_inner(contained_cells, parent_cells);
+  }
 
   return contained_cells;
 }