code: function ( payload ) {
  		if ( payload.cmd === 'meshData' ) {
  
  			return this.buildMeshes( payload );
  
  		} else if ( payload.cmd === 'materialData' ) {
  
  			this.updateMaterials( payload );
  			return null;
  
  		}
  	}
docs: Delegates processing of the payload (mesh building or material update) to the corresponding functions (BW-compatibility).
  
  @param {Object} payload Raw Mesh or Material descriptions.
  @returns {THREE.Mesh[]} mesh Array of {@link THREE.Mesh} or null in case of material update