Return a osg::Vec value instead of a non const reference.

Modified Files:
 	scene/model/SGMaterialAnimation.cxx

diff --git a/simgear/scene/model/SGMaterialAnimation.cxx b/simgear/scene/model/SGMaterialAnimation.cxx
index 72df88e537ce6c0840e7d0a5485174173e2abe16..1e7afdd976dbdf219312d49d651ac283718ca3c2 100644 (file)
--- a/simgear/scene/model/SGMaterialAnimation.cxx
+++ b/simgear/scene/model/SGMaterialAnimation.cxx
@@ -98,7 +98,7 @@ struct ColorSpec {
     return v;
   }
 
-  osg::Vec4& rgbaVec4()
+  osg::Vec4 rgbaVec4()
   {
     return rgba().osg();
   }