Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Derakon]

I'm on a glacier map with a magma vent. Thus, the vent has "frozen over" with an obsidian cap. If I pierce the lower level of the cap, then magma bubbles up out of it. I suspect that this is because the vent thinks that it should be one level taller than it actually is (or possibly two levels; I haven't tried to find out). Since, as I understand it, magma replenishing is mainly meant to just keep a ready supply of magma available, I think this qualifies as a bug.

[Draco18s]

Oooh, but think of all the neat volcano projects!

[Jay]

Although technically (because in reality, most LAVA on the surface will in fact bubble up out of its usual position every once in a while) the fact that lava on the surface only replenishes itself is in itself a bug, I think this qualifies as what SHOULD happen, not a bug.

[Wolfius]

I don't think this is a bug, just that obsidian otherwise prevents the magma from rising to it's proper level.

ie

code:

▓    ▓
▓≈≈≈≈▓<- default magma level
▓≈≈≈≈▓
▓≈≈≈≈▓
Cap
▓    ▓
▓▓▓▓▓▓<-magma "displaced" by rock cap
▓≈≈≈≈▓
▓≈≈≈≈▓
Dig
▓    ▓
▓▓≈▓▓▓<-magma rises to default level once rock removed
▓≈≈≈≈▓
▓≈≈≈≈▓

[Derakon]

As I said, the purpose of magma replenishing is to ensure that a magma vent or pipe always has a ready supply of magma (i.e. that it doesn't run out). I would say that most players who have any experience dealing with magma would call what I've described in this thread an unexpected behavior; certainly I doubt that Toady had this situation in mind when he wrote up magma replenishing. Hence I reported it as a bug.

Toady may feel that it isn't. That's fine, it's his prerogative. But it should be intentional that that's the case, and I'd like to know if it is.

[Draco18s]

I think what the OP is saying is this:

code:

▓    ▓
▓≈≈≈≈▓<- default magma level
▓≈≈≈≈▓
▓≈≈≈≈▓
Cap
▓    ▓
▓▓▓▓▓▓<-magma "displaced" by rock cap
▓≈≈≈≈▓
▓≈≈≈≈▓
Dig
▓≈≈≈≈▓<-magma rises above default level due to
▓▓≈▓▓▓  displacement by the obsidian cap
▓≈≈≈≈▓
▓≈≈≈≈▓

[Derakon]

Actually, no - I'm digging out the frozen cap, leaving a floor behind. If I pierce the floor, then magma bubbles up through it, but goes no higher.

Or, well, it might, but I haven't checked and that's not what I'm talking about.

Basically I'm saying that the expected behavior is that a magma pipe's top level should be wherever it was when your dwarves arrive on-site.

[Sowelu]

My "expected behavior" is that if you pierce the cap, magma bubbles up to occupy the tile that previously had obsidian, and then cools to form obsidian in the same place before long.