Deleting all the objects in the attached saves causes a crash that has something to do with the construction robots.

07-07-2026, 18-13-50.png

For some reason if any of the mods is not enabled resulting in the mod change migration menu, or whatever it's called, on load the crash doesn't happen ...

Hi, I'm trying to create a tips-and-tricks for Cargo Ships and wanted to grab the Waterway button from the toolbar, but if I'm not mistaken there isn't a way to get the widget position.

Would it be possible to add a SimulationWidgetType for the shortcut toolbar so that it can be found by get_widget ...

Some additional info from the thread Loewchen linked:

- It's not (directly) related to fast_replace = true. The crash also happens if you place a second rolling stock on top of the other.
- It doesn't need to be the same rolling stock. I came across it first with two different locomotives
- It ...

Not sure if this is the same bug. I'm specifically not fast-replacing the loco for my bug.

E: Probably it is, it crashes on the same line:
Error Rail.cpp:182: this->state == RailConnectionDirection::None was not true

I found this crash-to-desktop when placing a locomotive on top of another locomotive right in between two tracks.

I came across the issue when messing with the new fast_replace option for rollingstock, but as it turns out that isn't the root cause.
It's kind of a weird scenario since the solution ...

The docs just says they are doubles. And I understand that friction would slow the vehicle down when coasting and while breaking the friction force and braking force are combined to determine how fast the vehicle slows. But what does a value of 2, for instance, represent and how does it relate to ...

Hi, as mentioned in my Documentation Improvement Request about the TipTrigger explanations, I was looking for a TipTrigger that fires when a player (manually) mines a specific entity. There is MineItemByRobotTipTrigger which can count the number of times a robot mines anything. But this can't filter ...

Hi, I was looking through the TipTriggers but found it hard to understand when a bunch of them actually should be used.

Here's my non-exhaustive list of the ones that I found hard to understand even after how they are used in vanilla:

- entity-transfer: in/out of what?
- sequence: How is it ...

Unless I don't correctly understand what this setting should do, GameViewSettings.show_alert_gui doesn't seem to work.


game_view_settings = {
show_controller_gui = true,
show_quickbar = true,
update_entity_selection = true,
show_alert_gui = true
}

With these settings for a tips-and-tricks ...

Hi, I noticed while making a tips-and-tricks sim that the game crashes when the train gui is open while the entity dies.
I've attached a mod folder with two added tips-and-tricks one with the train which crashes and one with an assembler that doesn't crash.
I've also attached the log file.

I'm working on tips-and-tricks sims and one of my entities has some on_built code that has to run. But when I create it with create_entities_from_blueprint_string there is no way to raise any event.

Is it possible to add an optional parameter to create_entities_from_blueprint_string so that it ...

I'm back once again to humbly request considering this change for LuaRenderObjects.

It can maybe be combined with this request from Quezler:
https://forums.factorio.com/viewtopic.php?p=631766
Where creating an animation object always starts at frame 0 (excluding using frame offset).

A related ...

A user of my mod encountered a bug where the player.undo_redo_stack.get_undo_item(1) returned an array where the first index is empty but starting from index 2 it's filled as expected.

05-19-2026, 22-19-23.png
In this screenshot you can see the undo_items array starting at index 2.

I don't ...

Maybe a minor bug, but I came across this when I was messing with locomotives.

As the title says, a locomotive's open_sound and close_sound never play. For other entities these are used when their gui is opened/closed but this doesn't happen for trains. And since the fields are defined for the ...

As an addendum, I have made two other requests regarding the things we can do with animations:
1. Pausing/changing the speed of animations without jumping the frames
2. Exposing the animation prototype data in the runtime prototypes object

I'd be really happy if someone took the time to ...

When two entities with the same render layer are drawn, their y-coordinate determines which is drawn on top: Lower y is drawn over higher y.

With multiple modding projects I've encountered the limitation that you can't recreate this behavior in LuaRenderObjects. Render objects that are created ...

I was talking about another crash of the simulator with Jarg in the modding discord and he has created a pull request on your side for the fix for that, so maybe that also fixes this.

Edit:
Nevermind

justarandomgeek wrote: oh that one's a gui thing, i'm not touching that

I was messing about with creating tips-and-tricks simulations for my mod and was trying out the game.simulation.write method which lead to a crash to desktop.
Trying to get a minimal reproduction for it to report here I stumbled on some other weird behavior. With just story board:


game.simulation ...

+1 for the unified "Id = true"[]

This is a follow-up from a bug that Rseding partially fixed back in May.

When placing tiles over cliffs that collide with them some cliffs are removed. Others aren't.
It does work correctly when placing from the editor. So I assume Rseding only fixed it from there. But I'm not sure.

05-06-2025 ...