From f031160066e982aa2e3f22a6ef8c8264aa4841be Mon Sep 17 00:00:00 2001
From: Dario Sassi <dario.s@egaltech.com>
Date: Mon, 11 Nov 2019 07:30:29 +0000
Subject: [PATCH] EgtGeomKernel : - a Polygon3d aggiunta GetCentroid -
 modificata PolygonPlane per gestire correttamente i triangoli dando solo i
 tre vertici senza ripeterne uno.

---
 Polygon3d.cpp    | 12 ++++++++++++
 PolygonPlane.cpp |  2 +-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Polygon3d.cpp b/Polygon3d.cpp
index b41e773..a5f5a87 100644
--- a/Polygon3d.cpp
+++ b/Polygon3d.cpp
@@ -210,6 +210,18 @@ Polygon3d::GetPolyLine( void) const
    return PL ;
 }
 
+//----------------------------------------------------------------------------
+Point3d
+Polygon3d::GetCentroid( void) const
+{
+   PolygonPlane PolyPlane ;
+   for ( const auto& ptP : m_vVert)
+      PolyPlane.AddPoint( ptP) ;
+   Point3d ptCen ;
+   PolyPlane.GetCentroid( ptCen) ;
+   return ptCen ;
+}
+
 //----------------------------------------------------------------------------
 double
 Polygon3d::GetPerimeter( void) const
diff --git a/PolygonPlane.cpp b/PolygonPlane.cpp
index 5e3564b..ff0db47 100644
--- a/PolygonPlane.cpp
+++ b/PolygonPlane.cpp
@@ -61,7 +61,7 @@ bool
 PolygonPlane::Finalize( void)
 {
   // almeno 3 punti (il triangolo è il poligono con minimo numero di lati)
-   if ( m_nPntNbr < 3)
+   if ( m_nPntNbr + 1 < 3)
       return false ;
   // se il poligono non è stato chiuso, aggiungo calcolo per ultimo lato
    if ( ! AreSamePointApprox( m_ptFirst, m_ptLast)) {