scenery: Only run SGModelData in the topmost model.

It looks like that we loose the nasal script stored
in the property tree when this callback is issued
multiple times.

This should fix
 http://code.google.com/p/flightgear-bugs/issues/detail?id=714

diff --git a/simgear/scene/model/SGReaderWriterXML.cxx b/simgear/scene/model/SGReaderWriterXML.cxx
index 17f23bc75877e553919db0a6bfb57caee24e3168..17c51dd9d91ceb93f921b277a0cb71e496d008c7 100644 (file)
--- a/simgear/scene/model/SGReaderWriterXML.cxx
+++ b/simgear/scene/model/SGReaderWriterXML.cxx
@@ -218,7 +218,9 @@ sgLoad3DModel_internal(const SGPath& path,
     SGSharedPtr<SGPropertyNode> prop_root = options->getPropertyNode();
     if (!prop_root.valid())
         prop_root = new SGPropertyNode;
+    // The model data appear to be only used in the topmost model
     osg::ref_ptr<SGModelData> data = options->getModelData();
+    options->setModelData(0);
     
     osg::ref_ptr<osg::Node> model;
     osg::ref_ptr<osg::Group> group;