Railguns on hinges causes klang

Exoterminator shared this bug 6 months ago
Reported – Awaiting fix

I was working on a custom turret design that has 3 railguns on separate hinges, all on one advanced rotor. Once more than 1 railgun is placed onto a hinge, they start to vibrate and will continue to shake faster and faster until the railguns are destroyed or removed. Rotor/hinge lock and brake torque don't stop it, only delay how long till it starts moving.


In the attached video I have all hinges and the rotor locked but otherwise set to default settings. I had just placed the 3rd railgun and it knocked me away, the video starts as I approach. The turret controller wasn't configured and the programmable block didn't have a script loaded.

Replies (2)

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Hello, Exoterminator!

Sorry to hear you're experiencing this issue. I have been trying to reproduce this looking at your setup but have been unable to get any movement from the Railgun out of the ordinary like your video shows. You mention you have an unused script but are you running any mods? If not, can you please supply a copy of the world with any reliable steps for me to reproduce the issue?

  • You can access your save files by typing %appdata% into your Windows search bar and you will be redirected to the hidden Roaming folder. After that just follow: \Roaming\SpaceEngineers\Saves. There should be a folder with your SteamID and your saves.
  • Please zip the file and attach it here. If you are having difficulty attaching files you can optionally use Google Drive. When sharing a google drive link please make sure it is set to be downloadable by anyone with the link.

Kind Regards

Laura, QA Department

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I do sometimes use Midspace's Speed mod but this was happening regardless of the mod being loaded. The world shown in the video is attached and labeled Star System, I also attached a brand new empty world that hasn't had any mods loaded since it also occurs there.

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Hello, Exoterminator!

Thank you so much for the saves. I have blueprinted the issue grid and can reproduce it every time upon paste. For some reason, when I recreate the item it does not happen. I can report the blueprinted item but may be asked to reproduce the grid. I'm trying to determine if it is just the particular grid you have created that is causing the issue or, if you are recreating it each time and are doing something different to me. Could you please clarify? When I recreate the grid, I am only having it circler slightly. I am unable to check any settings on yours because of course it goes quite crazy on either save load or, blueprint paste. I hope this makes sense!

Kind Regards

Laura, QA Department

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The shaking happens for me both when pasting the blueprint and when building it block by block. When built block by block it seems to only have a small chance of triggering by itself but will seemingly always trigger once a hinge lock is turned on or off. I can get it to happen with just a row of 5 blocks, 3 hinges and 3 railguns. The tipping tip seems to be once a 3rd railgun is placed onto a hinge as 2 railguns and 3 hinges doesn't make it happen. Changing torque values can sometimes make it happen, more often increasing them above default, but changing the lock state has been the main way of causing the shake.

I've attached a short video showing the hinge options and then a small wobble once turning hinge lock on and the shaking after turning it off.

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Hello, Exoterminator!

Thank you for the video, I can see exactly how you reproduced the issue. Thank you for the information. I have reported this internally :)

Kind Regards

Laura, QA Department

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Can reproduce with both pasted BP as well as rebuilt and pasted grid.

Note: Rebuilt and pasted grid is normally perfectly still, so it does not necessarily show the issue. However, if you "throw" the BP while placing it, or if you bump another large grid into it after placing, to initiate some motion, the grid becomes unstable almost immediately and shakes itself apart.

It's also not limited to that particular build, or to hinges, or to railguns.

It seems that any fork-like arrangement (with at least three tines) of long and heavy subgrids is prone to that issue. And the larger and heavier the tines become, and the greater their inertial moment becomes on account of their weight distributed over a great length, the more sensitive the grid becomes, especially when the grid is powered and the rotors or hinges actively control or resist movement. Eventually, simply placing it is enough to start its destructive feedback.

Files: wob.mp4
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b04f83a7af32855e59b41d6c23f816e7

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