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[saberbom]

I made a mini dwarf-made river underground and found out that just one Z level below the river is a magma pool. As any good player would do, I dug as such so that a waterfall would hit the magma pool below. I expected to see obsidian forming just like in minecraft, but instead it creates magma mist the game keeps telling me there is a section of the cavern has collapsed.

[saberbom]

here's the image
https://www.dropbox.com/s/20rl73eonvwyfyu/Untitled.png?dl=0
P.S sorry I cant upload the image using the insert image like a normal human being

[KittyTac]

The obsidian sunk into lava, causing a cave-in. This isn't Minecrap, where everything floats.

[saberbom]

That what I was also expecting. But as I looked, there is no obsidian on the bottom of the magma pool.

[KittyTac]

That what I was also expecting. But as I looked, there is no obsidian on the bottom of the magma pool.

Because magma pools are pipes extending to the bottom of the magma sea, and anything that hits the bottom of the sea is destroyed. It's the Magma Flow. You'll know the moment you drop a goblin down the pool.

[Putnam]

Minecrap

now, now, random acts of pettiness are rarely endearing

[Eschar]

Minecrap

now, now, random acts of pettiness are rarely endearing

I move that KittyTac's usage is justified

[KittyTac]

Minecrap

now, now, random acts of pettiness are rarely endearing

I move that KittyTac's usage is justified

It isn't petty if it's true.

[Eschar]

Minecrap

now, now, random acts of pettiness are rarely endearing

I move that KittyTac's usage is justified

It isn't petty if it's true.

Amen.

[hertggf]

Minecraft is right though, obsidian should be about neutrally buoyant in the same magma it cooled down from. DF doesn't model buoyancy
any more than Minecraft does and "everything sinks" isn't really any better than "everything floats."

[Eschar]

Minecraft is right though, obsidian should be about neutrally buoyant in the same magma it cooled down from. DF doesn't model buoyancy
any more than Minecraft does and "everything sinks" isn't really any better than "everything floats."

By 'everything floats' we refer not to whether obsidian should be buoyant in lava (and even if we were, things that are less buoyant still float), but rather that Minecraft allows stuff to float anywhere, unsupported.

[MrWiggles]

Obsidian wouldnt have to float. It would partly depend on its shape, and the current in the river.

[KittyTac]

I mostly meant solid blocks floating in the air, which I often talk about while mocking Minecrap fans.

[Bortness]

Minecraft is right though, obsidian should be about neutrally buoyant in the same magma it cooled down from. DF doesn't model buoyancy
any more than Minecraft does and "everything sinks" isn't really any better than "everything floats."

The solid form of something is not always of similar buoyancy to the liquid form.  See: ice vs. water.

[Miuramir]

The solid form of something is not always of similar buoyancy to the liquid form.  See: ice vs. water.

Note, however, that despite our considerable experience with water ice, that it is unusual.  For most substances, the solid form is denser than the liquid form, and will sink.  I did a little bit of poking around, and as far as I can tell solid obsidian is *probably* denser than fluid lava, but in most cases other factors dominate.  Lava is typically quite viscous, and when we encounter it usually it is in an environment that is super-cold compared to itself.  It's also frequently flowing (with the exception of a few lava lakes), which complicates things further.  In reality, it's also usually not solid, and you get a whole series of gradations between quite fluffy pumice and pure glassy obsidian.  (The dissolved volatiles are an additional reason the lava may have lower density.)