X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FINTERP_KERNEL%2FVectorUtils.hxx;h=7ac0582bd6b7b711101a3e36b5387d72e2296f7b;hb=19a5d11f2c31745a83bd6993357263641c0babe5;hp=b261b453327f38bfce441e000d6c430fda53c85b;hpb=75943f980f7b908052ef03c2c0154508f4b0a039;p=tools%2Fmedcoupling.git

diff --git a/src/INTERP_KERNEL/VectorUtils.hxx b/src/INTERP_KERNEL/VectorUtils.hxx
index b261b4533..7ac0582bd 100644
--- a/src/INTERP_KERNEL/VectorUtils.hxx
+++ b/src/INTERP_KERNEL/VectorUtils.hxx
@@ -1,4 +1,4 @@
-// Copyright (C) 2007-2014  CEA/DEN, EDF R&D
+// Copyright (C) 2007-2016  CEA/DEN, EDF R&D
 //
 // This library is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
@@ -145,6 +145,19 @@ namespace INTERP_KERNEL
     //    return std::fabs(x - y) < errTol;
   }
 
+
+  /**
+   * Test whether two 3D vectors are colinear. The two vectors are expected to be of unit norm (not checked)
+   * Implemented by checking that the norm of the cross product is null.
+   */
+  inline bool isColinear3D(const double *v1, const double *v2, const double eps = DEFAULT_ABS_TOL)
+  {
+    double cros[3];
+    cross(v1, v2, cros);
+    return epsilonEqual(dot(cros, cros), 0.0, eps);
+  }
+
+
   /**
    * Compares doubles using a relative tolerance
    * This is suitable mainly for comparing larger values to each other. Before performing the relative test,