code: function ( MaterialNode ) {
  
  			var mappingType = MaterialNode.MappingInformationType;
  			var referenceType = MaterialNode.ReferenceInformationType;
  
  			if ( mappingType === 'NoMappingInformation' ) {
  
  				return {
  					dataSize: 1,
  					buffer: [ 0 ],
  					indices: [ 0 ],
  					mappingType: 'AllSame',
  					referenceType: referenceType
  				};
  
  			}
  
  			var materialIndexBuffer = MaterialNode.Materials.a;
  
  			// Since materials are stored as indices, there's a bit of a mismatch between FBX and what
  			// we expect.So we create an intermediate buffer that points to the index in the buffer,
  			// for conforming with the other functions we've written for other data.
  			var materialIndices = [];
  
  			for ( var i = 0; i < materialIndexBuffer.length; ++ i ) {
  
  				materialIndices.push( i );
  
  			}
  
  			return {
  				dataSize: 1,
  				buffer: materialIndexBuffer,
  				indices: materialIndices,
  				mappingType: mappingType,
  				referenceType: referenceType
  			};
  
  		}
docs: Parse mapping and material data in FBXTree.Objects.Geometry.LayerElementMaterial if it exists