fgSetBool("/environment/clouds/status", false);
} else if ( arg == "--enable-clouds" ) {
fgSetBool("/environment/clouds/status", true);
+#ifdef FG_USE_CLOUDS_3D
} else if ( arg == "--disable-clouds3d" ) {
fgSetBool("/sim/rendering/clouds3d", false);
} else if ( arg == "--enable-clouds3d" ) {
fgSetBool("/sim/rendering/clouds3d", true);
+#endif
} else if ( arg.find( "--fov=" ) == 0 ) {
parse_fov( arg.substr(6) );
} else if ( arg == "--disable-fullscreen" ) {