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[Loud Whispers]

Looking through my stocks screen for furniture to melt, I noticed that of all my grates one in particular was showing damage.

Spoiler (click to show/hide)

The darkened water square is where the grate is constructed.

And it was then where I remembered there was also someone else who had their grates deconstruct beside a waterfall despite never designating them to. There is no deconstruction command here, no dump designations or any trickery like that, it's never so much as even seen contact with a single non-Dwarven creature let alone a building destroyer.
So ruling out magical teleporting magma, can water corrode metal furniture? I'm going to set up some grates in a tub alongside some other stuff to see if it does, even for things that shouldn't like silver or gold. I only noticed this wear damage after years of in game Dwarf time, so it's probably easier to just see if anyone else's noticed such wear damage?

And then there's this thing.

Spoiler (click to show/hide)

Essentially it's a ramp surrounded by a cross-shape of walls:

Code: [Select]

Z LVL -1
+O+
O▲O
+O+

Z LVL 0
+O+
O▼O
+O+
This ramp should be unusable. I stumbled upon it in Fortress mode with some poor designations when I noticed a sudden drop in FPS and one Dwarf refusing to eat or drink, digging away. I thought the ramps were broken but they appeared to work, with the Dwarf capable of traveling between the levels to dig, yet never leaving to eat or drink. Removing one of the walls on the top z-lvl fixes any pathing issues, but I'm also interested now in seeing how this works and how it can be exploited. Recreating the ramp in arena mode produced a ramp that was supposedly usable judging by the look tool, but failed to allow controlled and uncontrolled units to traverse through it. I'm still guessing that the ramps are unusable despite what the look tool says, even in Fortress mode [the miner's ability to traverse them owing to some choice undug walls] but there may be something stranger afoot, like how wagons are capable of traveling through some unusable ramps.

[AutomataKittay]

In response to long term underwater damage, no, I've never seen such damage. Unless it's been happening over decades, it haven't happened in any fortresses I've had. I suppose ice might do it, but I've avoided areas that freeze by luck lately.

Closest thing I can think of are some forgotten beast or titans wandering around. I know I once found some damaged thing and asked about it in confusion before figuring out it was some wandering Yeti trying to rip my things out for a while. Only things that's gotten damaged was either building destroyer or stuffs I've accidentally left on refuse pile for a while.

Come to think, I've not actually observed magma effects, I just assumed it went straight to melting for things without ignition point without showing damage signs and that only things actually burning would be damaged.

Can't really help with the ramps, though, outside of noting that pathfinding acts pretty erratically sometimes.

[Crashmaster]

Experimentation would also require a matching grate in a salt water tub. Though a fresh water tub in a salt biome might not be the same as fresh-water biome water.

some 90-year old submerged wooden grates I have are still fine.

[wierd]

Does the water ever freeze?

I have seen a nasty little bug, where a floor grate that is perfectly supported from the sides will deconstruct if water below it freezes, then thaws.  I suspect this to be a "support" related issue, despite the grates being perfectly supported on all 4 sides.

[AutomataKittay]

Does the water ever freeze?

I have seen a nasty little bug, where a floor grate that is perfectly supported from the sides will deconstruct if water below it freezes, then thaws.  I suspect this to be a "support" related issue, despite the grates being perfectly supported on all 4 sides.

It happens with wells too, I think it's anything that let water flow through it get popped like that if it's built right above water. Haven't had any deconstruction if it's a z of empty air between it and water, though. Hatches haven't deconstructed on me, either.

[Loud Whispers]

Does the water ever freeze?

I have seen a nasty little bug, where a floor grate that is perfectly supported from the sides will deconstruct if water below it freezes, then thaws.  I suspect this to be a "support" related issue, despite the grates being perfectly supported on all 4 sides.

Half way beneath the surface of the world? Not possible.

Closest thing I can think of are some forgotten beast or titans wandering around. I know I once found some damaged thing and asked about it in confusion before figuring out it was some wandering Yeti trying to rip my things out for a while. Only things that's gotten damaged was either building destroyer or stuffs I've accidentally left on refuse pile for a while.

Too many doors, Dwarves, passageways and layers of water for a Titan to get deep in the waterways without anyone noticing. It'd be even stranger for a building destroyer to leave every other creature and building alone, only to partially damage this one grate.

[AutomataKittay]

Does the water ever freeze?

I have seen a nasty little bug, where a floor grate that is perfectly supported from the sides will deconstruct if water below it freezes, then thaws.  I suspect this to be a "support" related issue, despite the grates being perfectly supported on all 4 sides.

Half way beneath the surface of the world? Not possible.

Closest thing I can think of are some forgotten beast or titans wandering around. I know I once found some damaged thing and asked about it in confusion before figuring out it was some wandering Yeti trying to rip my things out for a while. Only things that's gotten damaged was either building destroyer or stuffs I've accidentally left on refuse pile for a while.

Too many doors, Dwarves, passageways and layers of water for a Titan to get deep in the waterways without anyone noticing. It'd be even stranger for a building destroyer to leave every other creature and building alone, only to partially damage this one grate.

as amusing the image of sneaking building smashers might be, was there any time the grates were moved around and rebuilt? I imagine not since it'd be noticed then.

Well, it's a mystery for sure, huh.

[Funburns]

Was this grate by a waterfall? It could be that objects are falling off it and damaging the grate somehow. Or perhaps even falling water can do that now. Maybe?

What's the grate next to, above and underneath?

[Aviator CJ]

I have seen a bed take damage from a tantruming dwarf once, is it possible something similar happened here?

[Urist Da Vinci]

1. Might be interesting to inspect other built furniture with DFHack to check the amount of wear on each item.

2. Does the strange ramps count as passable for the purpose of "no access to construction materials"?

[Di]

Some types of ghosts can damage building items (that's how all the building are toppled). Are you sure you didn't have any energetic poltergeists?

[Loud Whispers]

I have seen a bed take damage from a tantruming dwarf once, is it possible something similar happened here?

Tantruming Dwarves would drown before they got the chance to break this grate.

Some types of ghosts can damage building items (that's how all the building are toppled). Are you sure you didn't have any energetic poltergeists?

Everything's slabbed and buried immediately.

2. Does the strange ramps count as passable for the purpose of "no access to construction materials"?

It says no access last I checked.

[MrWillsauce]

I have seen a bed take damage from a tantruming dwarf once, is it possible something similar happened here?

Tantruming Dwarves would drown before they got the chance to break this grate.

Not tantrumming vampires

[TruePikachu]

I have seen a bed take damage from a tantruming dwarf once, is it possible something similar happened here?

Tantruming Dwarves would drown before they got the chance to break this grate.

Not tantrumming vampires

If the grate is only bottom-accessable, they can't