From: kgv <kgv@opencascade.com>
Date: Tue, 27 Mar 2012 07:58:50 +0000 (+0400)
Subject: 0022523: DRAWEXE randomly crashed on smooth navigation in 3D-Viewer
X-Git-Tag: V6_5_3_beta1~7
X-Git-Url: http://git.dev.opencascade.org/gitweb/?a=commitdiff_plain;h=476ed21f1b90ed3b50685ddc328eecc4a917d2d8;p=occt-copy.git

0022523: DRAWEXE randomly crashed on smooth navigation in 3D-Viewer

Check vector modulus to avoid possible exceptions.
---

diff --git a/src/NIS/NIS_View.cxx b/src/NIS/NIS_View.cxx
index 7c4d644798..45f84111ee 100755
--- a/src/NIS/NIS_View.cxx
+++ b/src/NIS/NIS_View.cxx
@@ -550,6 +550,11 @@ void  NIS_View::Select (const NCollection_List<gp_XY> &thePolygon,
 
   // Compute transformation.
   const gp_XYZ anXdir (gp_XYZ(anX, anY, aZ) - anEye.XYZ());
+  if (anXdir.Modulus() <= gp::Resolution())
+  {
+    return;
+  }
+
   const gp_Ax3 anAx3 (anEye, aProj, anXdir);
   gp_Trsf aTrf;
   aTrf.SetTransformation (anAx3);