From c21b60b0388f1b3c98064556ae73f80e69eb3c55 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 23 Jul 2013 10:24:28 +0000
Subject: [PATCH] Added lazy setting of the UserDataContainer to avoid
 unncessarily create a UserDataContain when an empty description list is
 passed to Node::setDescriptions(..)

---
 src/osg/Node.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/osg/Node.cpp b/src/osg/Node.cpp
index b45dc016c..bf0637338 100644
--- a/src/osg/Node.cpp
+++ b/src/osg/Node.cpp
@@ -475,7 +475,11 @@ bool Node::containsOccluderNodes() const
 
 void Node::setDescriptions(const DescriptionList& descriptions)
 {
-    getOrCreateUserDataContainer()->setDescriptions(descriptions);
+    // only assign a description list (and associated UseDataContainer) if we need to.
+    if (!descriptions.empty() || getUserDataContainer())
+    {
+        getOrCreateUserDataContainer()->setDescriptions(descriptions);
+    }
 }
 
 Node::DescriptionList& Node::getDescriptions()