code: function ( NormalNode ) {
  
  			var mappingType = NormalNode.MappingInformationType;
  			var referenceType = NormalNode.ReferenceInformationType;
  			var buffer = NormalNode.Normals.a;
  			var indexBuffer = [];
  			if ( referenceType === 'IndexToDirect' ) {
  
  				if ( 'NormalIndex' in NormalNode ) {
  
  					indexBuffer = NormalNode.NormalIndex.a;
  
  				} else if ( 'NormalsIndex' in NormalNode ) {
  
  					indexBuffer = NormalNode.NormalsIndex.a;
  
  				}
  
  			}
  
  			return {
  				dataSize: 3,
  				buffer: buffer,
  				indices: indexBuffer,
  				mappingType: mappingType,
  				referenceType: referenceType
  			};
  
  		}
docs: Parse normal from FBXTree.Objects.Geometry.LayerElementNormal if it exists