Flex Splines - Somehow trying to connect to random things offscreen
I am facing a weird issue which must be mod related.
I am using
flex splines
, which works great most of the time. Except it now frequently tries to connect belts, pipes, and train tracks to some unknown object(s) at a very specific point on the map that appears to be below ground, even when looking in the opposite direction. This causes the framerate of every player to dip into single-digit until whoever trying to place a spline manages to snap the cursor back to a nearby fondation/floor/wall.
And even weirder : blueprints also get built at the same arbitrary-below-ground position on the map -- could it be 0;0;0, maybe?
I cleared everything accumulated several times already using the save-edit website, but it keeps placing new blueprints/splines there for some reason.
Has anyone else experienced this bug?
-- I'll try to record footage of the bug to better highlight what is happening
EDIT 2025-04-08: After investigation the bug is in fact caused by the mod SnapOn v1.2.5
(issue patched in v1.2.6
)

48 Replies
I also experience this with any long splines
Probably the origin or something yeah
cc @Andre Aquila <Aquila Industrial>
I recorded some footage of the bug: https://youtu.be/vLOCjPW1ZO0
Happens with roads in the road spline mod too
If possible, try to reproduce it on a fresh save with only Flex Splines loaded
After testing on a fresh save file, I can confirm the bug is caused by an interaction between the
Flex Splines
and SnapOn
mods.
=> As soon as SnapOn
is enabled, the splines misbehave by going into the ground: https://youtu.be/UGSCyCwWJiscc @SirDigby {Mod Name}
It's probably snapping to the conveyor that snapon creates
Wait now I wonder why even rail splines snap there lol
That's really weird. SnapOn shouldn't effect anything while just building belts..
Yeah, there is nothing in the code that touches belt holograms
IIRC it also does it with anything long range, like power connectors
Going to test rq
flexsplines + snapon:


removing snapon fixes above ^


odd
so anything snappable/connected even powerlines
I'm guessing powerlines are splines too
I'm really at a loss as to what SnapOn could be doing to cause that.
Might be something that the base game does
I have double-checked for pipes, and rails on my playground, same result : when both
Flex Splines
and SnapOn
are enabled, splines will misbehave https://youtu.be/Av1P-oI7YZAim going to try to find where it snapping to lol
The snapping also applies to blueprints somehow, it will "swallow" your buildings if you place a blueprint when looking slightly off the ground
@Andre Aquila <Aquila Industrial> any idea what the conflict might be?
It's not flexspline specfici I'm pretty sure
I can replicate it with snapon alone*
Just have to look really far..
Unless flexspline adds something once at the start
Going to check a new save
Out of curiosity, could you guys try with Infinite Splines, it's a c++ alternative
Yup ill check in a sec
Gonna try snapon in a fresh save rq

Still snaps to some weird place in the world
Somewhere in the forest
Probably 0,0,0
Yeah
let me check if it might even be a base game issue
Yeah, I've never seen anything like it
Odd
In base game, it just deletes the whole hologram
Try verifying your files?
Does your mod force keep the hologram?
Oh
I'll try that
Nope, my mod just does stuff to conveyor attachments like splitters and mergers
Wait nvm, it does not, just hides the hologram
It seems to not be an issue from extending spline distance
It's just snapping to the origin anytime it can't snap anywhere else (like looking at the sky)
it did end up being 0,0

So I can verify it happens with just SnapOn
Going to test a few things
The bug is present when just
SnapOn
is enabledYeah
Found the bit of code causing the issue. It's not what I expected
Curious now, what was wrong?
I was saying anything was a valid hit result for conveyor attachment holograms. Idk why it thinks a belt is one of those, though
That also causes the problems for every other spline?
Apparently
Ah, it wasn't even a spline thing, just straight up every buildable
Solution
Fix released
Nice!! no more 5fps trying to build my rail network!
Thanks !