convert_list = {}
convert_node = function(oldnode,newnode,p2_change_func)
    minetest.register_node(':'..oldnode, {
        tile_images = {'hdb_dc.png'},
        paramtype2 = "facedir",
        is_ground_content = true,
        groups = {convert=1,cracky=3},
    --  sounds = default.node_sound_stone_defaults(),
        can_dig = false,
    })
    convert_list[oldnode] = {name=newnode,np2=p2_change_func}
end
--[[
convert_node('minerals:tritanium_block','metallic:tritanium_block')
convert_node('metallic:steelpost','metallic:post')
convert_node('metallic:steelgirder','metallic:girder')
convert_node('metallic:steeljoint','metallic:joint')
]]--
if table.getn(convert_list) > 0 then
    minetest.register_abm({
        nodenames = {'group:convert'},
        interval = 10,--ABMI['moderate'],
        chance = 1,
        action = function(pos, node, active_object_count, active_object_count_wider)
            if convert_list[node.name].np2 then
                newparam = convert_list[node.name].np2(node.param2)
            else
                newparam = node.param2 end
            minetest.env:add_node(pos,{type="node",name=convert_list[node.name].name,param2=newparam})
        end
    })
end