I'd be interested in (co-)developing such a mod. My idea is to provide a dialog upon placement, if one of the entities is not available in the logistic network. Then for each of those entities (maybe also include a check if available entities >= amount needed), show possible candidates to replace ...

Whatever is best for UPS. I'd say only a few mods use the undo/redo API at all.
For me, as a programmer, it is more useful (or convenient) if entries of an array of UndoRedoActions really are UndoRedoActions (having a type and some data). If you decide to leave it as-is, please add a hint to the ...

So, looking into this - a given undo item can have several actions in that item and one or more may be invalid. When pushing the structure to Lua the push logic will skip invalid entries however it still increments the index that it uses to put the undo item actions into the lua table.

I can "fix ...

Can you provide a save file created between steps 3 and 4? i am unable to reproduce any issues and i suspect i am misunderstanding which actions are super forced or normal or ghost or blueprint builds.


Rotate the belt in the cursor so that is is not facing north. Place it where the ...

Steps to reproduce:
1. Build a belt
2. Super-force build a splitter (belt is now marked for deconstruction and splitter ghost is created)
3. Place the belt again in another direction on the same position (splitter ghost is removed)
4. Print the last undo item. The first entry is nil
/c game.print ...

The only event that is fired related to that is on_player_cursor_stack_changed when you insert a non-ghost module

Steps to reproduce:
Use the mod I attached. Place 2 electric poles and connect them with red or green wire. Then press Ctrl+Z. The floating text states that the connection was undone, but no chat message.

When I disconnect a wire connection by script the next tick after it was connected and I want ...

I figured out that the tiles of the other planets do not use the elevation variable inside map_gen_settings. If you check planet-fulgora-map-gen.lua and tiles-fulgora.lua (other planets accordingly), you see that the usey a funny mix of everything.

Even modifying the "fulgora_elevation" property to ...

Relating to https://www.factorio.com/blog/post/fff-402. When using set_blueprint_entities, even without modifying anything, it forgets those wire connectiong going to external entities.

script.on_event(defines.events.on_player_setup_blueprint, function(event)
local item = event.record or event ...

Maybe https://lua-api.factorio.com/latest/eve ... gui_opened?

Usually, techs "disappear" when there are modified/replaced by a mod, which is subsequently deactivated.
If you started playing with a mod that changed or removed the tech, and decided to deactivate that mod, then you get this result.

Can't guarantee it's the root cause though.

[Edit] : This ...

What do you want to achieve exactly?

You can also run migration code in the on_configuration_changed event after checking if the buggy version of your mod was NOT installed

Also pyrawores does that with e.g. aluminium rock. It's basically a very low spawning probability

Keithen wrote: Sun Sep 14, 2025 7:39 pm What do you mean by "turned off"?

Disable iron before generating the map

You should use some regex for the string which will be replaced. In the base game, the rq values are 1.10, not 0.11.

Did you manage to generate copper at the same spots as iron, but with iron turned off?

Collision mask is the way to go, what did you do so far?

Alternatively use x+y*524288 :)
Since the game stores positions as fixed 32-bit numbers with 8 bits for decimal precision, that means the maximum map coordinate is 2^24. A chunk has 32 or 2^5 tiles, dividing one by the other would give a value large enough for every chunk in the game. 2^24/2^5 = 2 ...

Maybe https://lua-api.factorio.com/latest/pro ... multiplier?

It can be in the cursor_stack, but doesn't have to . It could be in the cursor, but also in inventory, or in another entity.
What i'm think of for the solution is in the on_gui_opened event, if the opened gui is of type blueprint, save the blueprint that you can get from player.opened, and if the ...