From ab3292caa09d60d3e399f3329500e4078e2a4edb Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Fri, 10 Jun 2016 14:05:36 +0200
Subject: [PATCH] ignore triangles with 2 or 3 identical vertices

---
 Polyhedron_IO/include/CGAL/IO/STL_reader.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Polyhedron_IO/include/CGAL/IO/STL_reader.h b/Polyhedron_IO/include/CGAL/IO/STL_reader.h
index 04eae64ca04..eae9cd164f7 100644
--- a/Polyhedron_IO/include/CGAL/IO/STL_reader.h
+++ b/Polyhedron_IO/include/CGAL/IO/STL_reader.h
@@ -80,7 +80,15 @@ namespace CGAL{
             ijk[j] = iti->second;
           }
         }
-        facets.push_back(ijk);
+        if((ijk[0] != ijk[1]) && 
+           (ijk[0] != ijk[2]) &&
+           (ijk[1] != ijk[2])){
+          facets.push_back(ijk);
+        }else{
+          if(verbose){
+            std::cerr << "ignore degenerate face" << std::endl;
+          }
+        }
         char c;
         input.read(reinterpret_cast<char*>(&c), sizeof(c));
         input.read(reinterpret_cast<char*>(&c), sizeof(c));