Materials.configureMaterials(config);
//this will cause problems if multiple conversions are run
//at the same time, because global variables are being modified
WorldCreator moduleManager =
new WorldCreator(config, worldModules);
moduleManager.addRepresentationsTo(mapData);
/* determine elevations */
updatePhase(Phase.ELEVATION);
String srtmDir = config.getString("srtmDir", null);