Update

mods/rgt_base/init.lua

@@ -40,11 +40,21 @@ rgt = {}
 local ns = rgt
 
 function ns.register_node(name, def)
+    def._name = name
     local alias
     if not name:find(":") then
         alias = name
         name = "red_glazed_terracotta:"..name
     end
+    if def._variants then
+        if type(def._variants) == "string" then
+            rgt_world["register_"..def._variants](def)
+        else
+            for _, x in ipairs(def._variants) do
+                rgt_world["register_"..x](def)
+            end
+        end
+    end
     minetest.register_node(":"..name, def)
     if alias then
         minetest.register_alias(alias, name)