From f83bdf081554c3b6ac77a7a1cfd9d31040b3d8b6 Mon Sep 17 00:00:00 2001
From: Luigi Malomo <malomo.luigi@gmail.com>
Date: Tue, 23 Mar 2021 01:06:28 +0100
Subject: [PATCH] quick and dirty fix for polygon import from trimesh

---
 vcg/complex/algorithms/polygon_support.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/vcg/complex/algorithms/polygon_support.h b/vcg/complex/algorithms/polygon_support.h
index c6df0d8e..bce0d219 100644
--- a/vcg/complex/algorithms/polygon_support.h
+++ b/vcg/complex/algorithms/polygon_support.h
@@ -141,7 +141,8 @@ namespace tri {
         {
             std::vector<typename TriMeshType::VertexPointer> vs;// vertices of the polygon
             ExtractPolygon(&*tfi,vs);
-            std::reverse(vs.begin(),vs.end());
+			if (vs.size() > 3)
+				std::reverse(vs.begin(), vs.end());
             //now vs  contains all the vertices of the polygon (still in the trimesh)
             if (vs.size()==0)continue;
             typename PolyMeshType::FaceIterator pfi =  tri::Allocator<PolyMeshType>::AddFaces(pm,1);