Set path before loading the model.

examples/js/loaders/FBXLoader.js

@@ -44,6 +44,7 @@ THREE.FBXLoader = ( function () {
 			var path = ( self.path === undefined ) ? THREE.LoaderUtils.extractUrlBase( url ) : self.path;
 
 			var loader = new THREE.FileLoader( this.manager );
+			loader.setPath( self.path );
 			loader.setResponseType( 'arraybuffer' );
 
 			loader.load( url, function ( buffer ) {