From cb6122f8a0fd3802f6ec0f94323c48e7e00adafa Mon Sep 17 00:00:00 2001
From: Dario Sassi <dario.s@egaltech.com>
Date: Thu, 6 Apr 2017 10:18:00 +0000
Subject: [PATCH] EgtGeomKernel : - in Zmap correzione per calcolo normali alle
 asportazioni con frese cilindriche.

---
 VolTriZmapVolume.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/VolTriZmapVolume.cpp b/VolTriZmapVolume.cpp
index f8a4722..917fa2a 100644
--- a/VolTriZmapVolume.cpp
+++ b/VolTriZmapVolume.cpp
@@ -2196,7 +2196,8 @@ VolZmap::CylBall_XYPerp( unsigned int nGrid, const Point3d & ptS, const Point3d
 
                      dSupZ = ( dDotUp - dX * vtP.x - dY * vtP.y) / vtP.z ;
 
-                     vtNmax = vtToolDir ^ vtMove ;
+                     Vector3d vtT = vtToolDir ^ vtMove ; 
+                     vtNmax = ( vtT.z < 0 ? vtT : - vtT) ;
                      vtNmax.Normalize() ;
                   }
                   else {
@@ -2223,7 +2224,8 @@ VolZmap::CylBall_XYPerp( unsigned int nGrid, const Point3d & ptS, const Point3d
                
                      dInfZ = ( dDotDw - dX * vtP.x - dY * vtP.y) / vtP.z ;
 
-                     vtNmin = - vtToolDir ^ vtMove ;
+                     Vector3d vtT = vtToolDir ^ vtMove ; 
+                     vtNmin = ( vtT.z < 0 ? - vtT : vtT) ;
                      vtNmin.Normalize() ;
                   }
                   else {