[Lou] [2.0.15] Railgun is shooting other Railsguns

[Zazuno]

good day.
I built a spaceship where my railguns are constantly being torn apart without me noticing. Then I built a loudspeaker to hear this. Every 4-5 hours one railgun destroys the other.
In this Twitch clip I sold the inserter arm for the ammunition and the other two railguns to recreate this scenario.
The basic problem is that the game doesn't tell me that the railgun that is shooting doesn't tell me that it theoretically hits the other railgun.
https://www.twitch.tv/zazunotv/clip/Jol ... 6Xx9_GR7YX

[True.Boriska]

[2.0.20]
+1
BP

Code: Select all

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pics

railgun3.jpg (148.82 KiB) Viewed 3933 times

railgun4.jpg (134.58 KiB) Viewed 3933 times

railgun5.jpg (149.2 KiB) Viewed 3933 times

railgun6.jpg (186.1 KiB) Viewed 3933 times

[Imaginos]

I'm having this same problem on a different layout. My railgun isn't destroyed immediately, but the result is the same.

railgun_bug.mp4

(14.03 MiB) Downloaded 116 times

[atomizer]

another test setup in 123708

[TePa]

No indication of the potential destruction caused, seems like the minimum range does something weird to the collision calc at least as moving the next turret down one highlights correctly

12-05-2024, 17-07-23.png (1.65 MiB) Viewed 3400 times

12-05-2024, 17-14-49.png (1.33 MiB) Viewed 3393 times

[Unn]

[2.0.24]
Can confirm that it is happening to my game as well in version 2.0.24. Railguns pointing diagonally that are right next to each other (but not within each other's firing cones) keep randomly getting destroyed. It's random enough that I have not caught it in the act yet. Platform has also taken 0 damage. This only seems to be occurring going to/from the shattered planet due to asteroid density.

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20241205073625_1.jpg (228.86 KiB) Viewed 3376 times

[The Phoenixian]

Well, glad I searched a second time before finalizing the post. Also ran into this issue. Just going to move the whole post here and hope I add some useful context.

Version 2.0.23: Railgun turret fratricide from damage outside indicated firing arc

In brief:
In some setups Railguns have a chance to destroy each other, and other buildings, without any indication to the player that something is wrong until supplies run out.

In detail:

When placing two railguns flush and at right angles (see attached image and the highlighted railgun within in specific) all indicators will show that neither turret is in the other's line of fire, as shown by a lack of red marks. As such, I expected they would not do damage to each other.

However, when firing at the extreme angles of it's arc, a railgun round can do enough damage to instantly destroy not only everything everything in it's path, but also objects beside it's path without ever alerting the player that something is wrong. The same effect also happens on the other side, occasionally destroying the promethium filtered express splitter.

Occurrences of the issue are intermittent, netting around maybe 36 railgun kills and 32 splitter kills within 6 hours for a pair of such setups, according to the kills chart. It should be at it's easiest to replicate when allowing railguns a broad range of targets.

While this can be solved by repositioning, the main issue is that the game provides no notice of the problem. At first because the indicator that provides warning while building says nothing is amiss, and later because kills on buildings by one's own turrets do not alert the player to the loss before the turret is silently replaced.

A ghost setup replicating the locations that caused the issue.

12-12-2024, 03-42-00.png (6.15 MiB) Viewed 3158 times

[Emblem]

Had it happen to me too. Visual guide says they're fine, but they are very much not.

https://youtu.be/On07n_yknbY [2.0.23 (build 80769 expansion, win64)]


I believe the reason some people are only noticing this issue hours in when supplies run out, is because the "victim" railgun is shooting asteroids that the "killer" railgun would otherwise be inclined to reach for and shoot. The victim runs out first, and the next railgun reaches to the edge of its range, which hits the victim.

[cbhj1]

from the videos I've seen of this, it looks like the target is being selected by bounding box, but the aim is for center, reaching outside the cone. If this is in fact the case, would it be solved by having it aim at the portion within the cone?

[EvoPulse]

This is happening to me. I'm two hours into a shattered planet run and realized I'm down to 30 spare railguns from 100 after noticing that rail guns were dying right in front of my eyes. Double check the placement, and there are no red overlap markers. So they should not be destroying each other.

I really don't want to have to reconfigure the ship, I have probably 10 to 20 hours in designing, re-configuring and testing my design.

In image: Bottom left most rail gun has not taken damage, it is a spare railgun that was previously damaged but placed in inventory and was automatically placed there when the previous gun was destroyed by friendly fire.

[warbaque]

Same issue [2.0.28]. My rail guns are getting destroyed

Screenshot from 2024-12-26 08-07-28.png (1.26 MiB) Viewed 2648 times

Screenshot from 2024-12-26 08-06-51.png (1.19 MiB) Viewed 2648 times

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[tappi]

12-28-2024, 13-43-40.png (1.72 MiB) Viewed 2238 times

Happens to me as well, the targeting arc is nowhere near the splitter but it gets destroyed by a railgun shot every once in a while. It doesn't even shoot the undergrounds that are next to it but the splitter which is further away gets destroyed.

The ship is the vindicator in the savefile.

[Muche]

Ref Asteroid collector disappears without receiving any damage.

[Orum]

They don't just hit other railguns that claim to be outside their range, they also hit collectors that claim to be outside of their range. For example, here is my railgun's alleged range, showing the collector outside of it:

range.jpg (166.27 KiB) Viewed 1611 times

And here it is killing the collector it supposedly can't hit:

railgun.jpg (35.55 KiB) Viewed 1611 times

[Lou]

Thank you all for the reports.

TLDR: fixed for 2.0.34.

The source of the issue was, that the railgun's projectile creation position was not collinear with the turret itself and the target, which made the projectile's damage area sometimes reach outside of expected bounds near the turret. I introduced a flag to AttackParameters called true_collinear_ejection that is false by default, and when true, makes the shooter-projectileCreation-target collinear (unless nonzero offset is specified of course) and set it true for Railgun Turret's attack parameters.

To illustrate before and after with visualisations:
before:

before.png (1.22 MiB) Viewed 803 times

after:

after.png (1.22 MiB) Viewed 803 times

Paraller red lines: marginal expected damage area (that is what the endengerement visualisations in game are based on)
Red rectangles are collision boxes
(following refers to last shot)
White Square: Turret center
Blue Square: Projectile creation position
Orange square: Target position
Green recangle: Damage area

[sounderblue]

Also seeing collectors being destroyed by railguns when there's no indication of collision when hovering the railgun. In this screenrint both ghosts are randomly destroyed, zero damage registered to platform-

02-08-2025, 15-43-01.png (2.26 MiB) Viewed 429 times

[cbhj1]

I'm still curious if asteroids are targeted by bounding box or center. Are they selected when any part enters the range, or the center? Also, whether the projectile is aimed only at the center or only part that is in range.

[Lou]

Also seeing collectors being destroyed by railguns when there's no indication of collision when hovering the railgun. In this screenrint both ghosts are randomly destroyed, zero damage registered to platform-

The case from the screenshot was happening with the old railguns but not with the new ones - was this unmoded 2.0.34 sounderblue?

I'm still curious if asteroids are targeted by bounding box or center. Are they selected when any part enters the range, or the center? Also, whether the projectile is aimed only at the center or only part that is in range.

Railgun targets are acquired by their position (that ussually means center) and their projectile is also aimed to the target's position.

[Scalinger2]

I'm glad there's a fix for this. When is the .34 version coming out? This is driving me absolutely insane. The way I check that something got destroyed is I don't have extras of anything and look at the 'request for construction' so I immediately know if something got destroyed although now knowing the problem I'm just going to move the cannons for now.

I attached my save where a railgun on the right side of my ship destroys a missile turret about 10 seconds into the save.

[Jap2.0]

I'm glad there's a fix for this. When is the .34 version coming out?

.34 is out, but on the experimental branch. That or a later version will probably be marked as stable somewhere in the next few days or weeks; if you'd rather not wait that long, then you can enable experimental updates (in settings, or if you're using Steam them right click Factorio -> properties -> betas).