From 3257f0020db38d679bcb9255ba61c556cd389fa9 Mon Sep 17 00:00:00 2001
From: Marco Feder <marco.feder@sissa.it>
Date: Wed, 18 May 2022 10:38:29 +0200
Subject: [PATCH] Fix clockwise_ordering

---
 source/cgal/surface_mesh.cc            |  2 +-
 tests/cgal/cgal_surface_mesh_01.output | 49 +++++++++++++-------------
 2 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/source/cgal/surface_mesh.cc b/source/cgal/surface_mesh.cc
index 49aa0839b6..bf535479ee 100644
--- a/source/cgal/surface_mesh.cc
+++ b/source/cgal/surface_mesh.cc
@@ -55,7 +55,7 @@ namespace
           Assert(false, ExcInternalError());
           break;
       }
-    if (clockwise_ordering == false)
+    if (clockwise_ordering == true)
       std::reverse(indices.begin(), indices.end());
 
     [[maybe_unused]] const auto new_face = mesh.add_face(indices);
diff --git a/tests/cgal/cgal_surface_mesh_01.output b/tests/cgal/cgal_surface_mesh_01.output
index b2df3eeeac..6a1b26a53f 100644
--- a/tests/cgal/cgal_surface_mesh_01.output
+++ b/tests/cgal/cgal_surface_mesh_01.output
@@ -8,7 +8,7 @@ DEAL::OFF
 0.00000 0.00000 0.00000
 1.00000 0.00000 0.00000
 0.00000 1.00000 0.00000
-3 0 1 2
+3 2 1 0
 
 DEAL::deal vertices: 4, cgal vertices 4
 DEAL::deal faces: 4, cgal faces 1
@@ -19,7 +19,7 @@ DEAL::OFF
 1.00000 0.00000 0.00000
 0.00000 1.00000 0.00000
 1.00000 1.00000 0.00000
-4 0 1 3 2
+4 2 3 1 0
 
 DEAL::dim= 2,	 spacedim= 3
 DEAL::deal vertices: 3, cgal vertices 3
@@ -30,7 +30,7 @@ DEAL::OFF
 0.00000 0.00000 0.00000
 1.00000 0.00000 0.00000
 0.00000 1.00000 0.00000
-3 0 1 2
+3 2 1 0
 
 DEAL::deal vertices: 4, cgal vertices 4
 DEAL::deal faces: 4, cgal faces 1
@@ -41,7 +41,7 @@ DEAL::OFF
 1.00000 0.00000 0.00000
 0.00000 1.00000 0.00000
 1.00000 1.00000 0.00000
-4 0 1 3 2
+4 2 3 1 0
 
 DEAL::dim= 3,	 spacedim= 3
 DEAL::deal vertices: 4, cgal vertices 4
@@ -53,10 +53,10 @@ DEAL::OFF
 1.00000 0.00000 0.00000
 0.00000 1.00000 0.00000
 0.00000 0.00000 1.00000
-3 0 1 2
-3 1 0 3
-3 0 2 3
-3 2 1 3
+3 2 1 0
+3 3 0 1
+3 3 2 0
+3 3 1 2
 
 DEAL::deal vertices: 5, cgal vertices 5
 DEAL::deal faces: 5, cgal faces 5
@@ -68,11 +68,11 @@ DEAL::OFF
 -1.00000 1.00000 0.00000
 1.00000 1.00000 0.00000
 0.00000 0.00000 1.00000
-4 0 1 3 2
-3 0 2 4
-3 3 1 4
-3 1 0 4
-3 2 3 4
+4 2 3 1 0
+3 4 2 0
+3 4 1 3
+3 4 0 1
+3 4 3 2
 
 DEAL::deal vertices: 6, cgal vertices 6
 DEAL::deal faces: 5, cgal faces 5
@@ -85,11 +85,11 @@ DEAL::OFF
 0.00000 0.00000 1.00000
 1.00000 0.00000 1.00000
 0.00000 1.00000 1.00000
-3 1 0 2
-3 3 4 5
-4 0 1 4 3
-4 1 2 5 4
-4 2 0 3 5
+3 2 0 1
+3 5 4 3
+4 3 4 1 0
+4 4 5 2 1
+4 5 3 0 2
 
 DEAL::deal vertices: 8, cgal vertices 8
 DEAL::deal faces: 6, cgal faces 6
@@ -104,9 +104,10 @@ DEAL::OFF
 1.00000 0.00000 1.00000
 0.00000 1.00000 1.00000
 1.00000 1.00000 1.00000
-4 0 2 6 4
-4 5 7 3 1
-4 0 4 5 1
-4 3 7 6 2
-4 0 1 3 2
-4 6 7 5 4
+4 4 6 2 0
+4 1 3 7 5
+4 1 5 4 0
+4 2 6 7 3
+4 2 3 1 0
+4 4 5 7 6
+
-- 
2.39.5