From fc67bf6a60ad94f61382886847e899899b1cd7ef Mon Sep 17 00:00:00 2001
From: Deepak Rangarajan <deepak.rangarajan@netl.doe.gov>
Date: Tue, 20 Jul 2021 10:17:20 -0400
Subject: [PATCH] Use a fixed seed when generating hull

---
 src/csg/cgal_helper_polyhedron.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/csg/cgal_helper_polyhedron.cpp b/src/csg/cgal_helper_polyhedron.cpp
index 1fa87b3..ea2735b 100644
--- a/src/csg/cgal_helper_polyhedron.cpp
+++ b/src/csg/cgal_helper_polyhedron.cpp
@@ -10,6 +10,7 @@
 #include <CGAL/boost/graph/graph_traits_Polyhedron_3.h>
 #include <CGAL/convex_hull_3.h>
 #include <CGAL/point_generators_3.h>
+#include <CGAL/Random.h>
 
 namespace {
 
@@ -110,11 +111,14 @@ create_polyhedron_from_hull(const std::tuple<double, double, double> &cube_size,
 
   auto p = std::make_shared<Polyhedron>();
 
+  // Use a fixed seed random function to ensure reproducibility
+  auto rand = CGAL::Random(0);
+
   std::list<cgal_helper::CK::Point_3> points;
-  CGAL::Random_points_on_sphere_3<cgal_helper::CK::Point_3> s(sphere_radius);
+  CGAL::Random_points_on_sphere_3<cgal_helper::CK::Point_3> s(sphere_radius, rand);
   std::copy_n(s, NUM_SAMPLING_PTS, std::back_inserter(points));
 
-  CGAL::Random_points_in_cube_3<cgal_helper::CK::Point_3> c(1.0);
+  CGAL::Random_points_in_cube_3<cgal_helper::CK::Point_3> c(1.0, rand);
   std::list<cgal_helper::CK::Point_3> points_c;
   std::copy_n(c, NUM_SAMPLING_PTS, std::back_inserter(points_c));
 
-- 
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