From 688403b46cf34be3b87e539f39a44a3b563d7087 Mon Sep 17 00:00:00 2001
From: Dario Sassi <dario.s@egaltech.com>
Date: Thu, 6 Aug 2020 18:49:50 +0000
Subject: [PATCH] EgtGeomKernel : - piccolo affinamento nell'uso di SVD per
 Zmap.

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

diff --git a/VolZmapGraphics.cpp b/VolZmapGraphics.cpp
index 5dc1c13..d8a9683 100644
--- a/VolZmapGraphics.cpp
+++ b/VolZmapGraphics.cpp
@@ -1993,8 +1993,8 @@ VolZmap::ExtMarchingCubes( int nBlock, VoxelContainer& vVox) const
 
                  // calcolo SVD 
                   SvdDecomposer svd( dMatrixN, Eigen::ComputeThinU | Eigen::ComputeThinV) ;
-                  auto dMatrixV = svd.matrixV() ;
-                  auto dSingularValue = svd.singularValues() ;
+                  const auto& dSingularValue = svd.singularValues() ;
+                  const auto& dMatrixV = svd.matrixV() ;
 
                  // Se la feature è un edge annullo il valore singolare minore.
                   if ( nFeatureType == EDGE) {