From Martin Lavery and Robert Osfield, added fallbacks for when now command line args are provided.

examples/osgmultitexture/osgmultitexture.cpp

@@ -27,6 +27,10 @@ int main( int argc, char **argv )
 
     // load the nodes from the commandline arguments.
     osg::Node* rootnode = osgDB::readNodeFiles(arguments);
+    
+    // if not loaded assume no arguments passed in, try use default mode instead.
+    if (!rootnode) rootnode = osgDB::readNodeFile("cessnafire.osg");
+    
     if (!rootnode)
     {
         osg::notify(osg::NOTICE)<<"Please specify and model filename on the command line."<<std::endl;