code: function ( textureMap ) {
  
  			var materialMap = new Map();
  
  			if ( 'Material' in fbxTree.Objects ) {
  
  				var materialNodes = fbxTree.Objects.Material;
  
  				for ( var nodeID in materialNodes ) {
  
  					var material = this.parseMaterial( materialNodes[ nodeID ], textureMap );
  
  					if ( material !== null ) materialMap.set( parseInt( nodeID ), material );
  
  				}
  
  			}
  
  			return materialMap;
  
  		}
docs: Parse nodes in FBXTree.Objects.Material