code: function () {
  
  			if ( 'GlobalSettings' in fbxTree && 'AmbientColor' in fbxTree.GlobalSettings ) {
  
  				var ambientColor = fbxTree.GlobalSettings.AmbientColor.value;
  				var r = ambientColor[ 0 ];
  				var g = ambientColor[ 1 ];
  				var b = ambientColor[ 2 ];
  
  				if ( r !== 0 || g !== 0 || b !== 0 ) {
  
  					var color = new THREE.Color( r, g, b );
  					sceneGraph.add( new THREE.AmbientLight( color, 1 ) );
  
  				}
  
  			}
  
  		}
docs: Parse ambient color in FBXTree.GlobalSettings - if it's not set to black (default), create an ambient light