From 5a94eed5c0e29b99a61c18883d9dbdf161c4ed15 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@e8eeb9e2-ec13-0410-a4a9-efa5cf37419d>
Date: Tue, 22 Nov 2011 12:51:50 +0000
Subject: [PATCH] + fix bug in Rotation::normalize()

git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5155 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d
---
 src/Base/Rotation.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/Base/Rotation.cpp b/src/Base/Rotation.cpp
index cb2a5368d2..919ea5479f 100644
--- a/src/Base/Rotation.cpp
+++ b/src/Base/Rotation.cpp
@@ -244,10 +244,12 @@ void Rotation::normalize()
                               this->quat[1]*this->quat[1]+
                               this->quat[2]*this->quat[2]+
                               this->quat[3]*this->quat[3]);
-    this->quat[0] /= len;
-    this->quat[1] /= len;
-    this->quat[2] /= len;
-    this->quat[3] /= len;
+    if (len != 0) {
+        this->quat[0] /= len;
+        this->quat[1] /= len;
+        this->quat[2] /= len;
+        this->quat[3] /= len;
+    }
 }
 
 Rotation & Rotation::invert(void)