void LuaVoxelManip::Register(lua_State *L)
{
    /*
        Regular version of the class
    */
    lua_newtable(L);
    int methodtable = lua_gettop(L);
    luaL_newmetatable(L, className);
    int metatable = lua_gettop(L);

    lua_pushliteral(L, "__metatable");
    lua_pushvalue(L, methodtable);
    lua_settable(L, metatable);  // hide metatable from Lua getmetatable()

    lua_pushliteral(L, "__index");
    lua_pushvalue(L, methodtable);
    lua_settable(L, metatable);

    lua_pushliteral(L, "__gc");
    lua_pushcfunction(L, gc_object);
    lua_settable(L, metatable);

    lua_pop(L, 1);  // drop metatable

    luaL_openlib(L, 0, methods, 0);  // fill methodtable
    lua_pop(L, 1);  // drop methodtable

    lua_register(L, className, create_object);

    /*
        Non-GC version of the class
    */
    lua_newtable(L);
    methodtable = lua_gettop(L);
    luaL_newmetatable(L, className_nogc);
    metatable = lua_gettop(L);

    lua_pushliteral(L, "__metatable");
    lua_pushvalue(L, methodtable);
    lua_settable(L, metatable);  // hide metatable from Lua getmetatable()

    lua_pushliteral(L, "__index");
    lua_pushvalue(L, methodtable);
    lua_settable(L, metatable);

    lua_pop(L, 1);  // drop metatable

    luaL_openlib(L, 0, methods, 0);  // fill methodtable
    lua_pop(L, 1);  // drop methodtable

    lua_register(L, className_nogc, create_object);
}


    switch (mgobj) {
        case MGOBJ_VMANIP: {
            ManualMapVoxelManipulator *vm = mg->vm;

            // VoxelManip_nogc object
            *(void **)(lua_newuserdata(L, sizeof(void *))) = vm;
            luaL_getmetatable(L, "VoxelManip_nogc");
            lua_setmetatable(L, -2);