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[Jisaan]

This might be a known bug, but I couldn't find it, so...

Pictures probably work best.



And directly underneath it:



I had designated the spot that ended up as a down ramp to be dug out as an up ramp before I could see the magma pipe, and oddly enough the miner was able to dig the down ramp out through the floor, revealing the pipe. In case it's important, the tile that was ultimately dug out used to be an obsidian floor, and the tile beneath it is now an obsidian upward slope.

[Shaostoul]

I'm slightly confused... what exactly is the problem?

I see the square room (pic 1) with a bunch of ramps around the wall edge and a dwarf in the middle. (Was there any time elapse between pic 1 and pic 2?)

I see the pipe, with the downward ramp.

Did your dwarf dig the ramp a z level above? (Like you are one z level above the ramp?)

[Jisaan]

No time lapse, so yes, the dwarf in the above pic just finished digging out the ramp in the bottom pic... Without putting any sort of hole in the floor between the two tiles.

It's not very difficult to figure out why it happened, actually. The game only reveals the chamber once you dig out a tile that breaches it, and until then it shows up as an unrevealed wall tile, which permits an up ramp to be designated on it. When this tile is dug out, it's revealed to be a floor tile, but since the ramp has already been dug out, it becomes a down ramp instead of an up ramp, automatically creating an up ramp below it instead of a down ramp above it, while allows an unbroken floor to persist between the miner and the ramp.

[Shaostoul]

interesting haven't had too many underground pipes or pools, so i haven't gotten to mess with em.

[LegoLord]

@ Shaostoul:  I think the problem is that a dwarf carved an upward ramp two z-levels below the level it was on.

[Variance]

So you mean your problem is that in the first pic, the dwarf didn't also make the downward ramp on top of the upward ramp, and it's still a normal floor tile on level 142? Because if the downward ramp was also made, then there wouldn't be any problem.

[Jisaan]

That's pretty much the problem, but instead of not making a downward ramp on top of the upward ramp, he dug out a downward ramp on the z-level beneath him, with an upward ramp below that. But yes, the basic problem is that there's still nothing but a normal floor tile on the level he was digging from.

[Variance]

That's pretty much the problem, but instead of not making a downward ramp on top of the upward ramp, he dug out a downward ramp on the z-level beneath him, with an upward ramp below that. But yes, the basic problem is that there's still nothing but a normal floor tile on the level he was digging from.

Okay, that would definitely be a bug, and a weird one too, because most bugs don't actually make other things happen. (Incidentally, how did you notice that there was a ramp under the downward ramp on level 141? Did you use k? Because if I have this right, the upward ramp would be on the floor of 141, so it should be obscured under the downward ramp also there. Unless you mean the upward ramp is several z levels below the downward ramp.)

[Neoskel]

People, there is no such thing as a 'downward ramp'. It only indicates that there is a ramp on the level below. It does not exist in and of itself. It can't support anything, you can't stand on it and it doesn't take up any space.

So the bug is that the miner dug a ramp 2 z-levels below (read: 1 z-level below where it was designated) without making a hole in the floor.

[Jisaan]

So the bug is that the miner dug a ramp 2 z-levels below (read: 1 z-level below where it was designated) without making a hole in the floor.

Yeah, this. Sorry I wasn't more clear. I probably should have included another picture, showing the z-level below the second pic, but by the time I realized it would help I was already finished with the fort.

[mendonca]

I came across a similar phenomenon recently (at least I think it was related)

I has already designated an up/down staircase to be built when a magma pool was discovered.

The dwrf subsequently built an up/down staircase in free space, I don't think this should have been allowed?

[LegoLord]

I have had a similar experience.  I designated a downward staircase to be dug above an upward staircase, and a stone appeared on top of the downward staircase, which was located in the cap of the pipe.  It was actually fairly close to the "shore" of the magma, and it was pretty far from the wall.

[Toady One]

Is this sort of thing reproducible from a hidden pipe map?  It's a lot easier to clean them up when they can be caught in the act.

[LegoLord]

Should be easily replicated.  Just embark on a 2x2 with magma and dig straight down from the middle of the quarter of the map that has the magma pipe/pool.

[Jisaan]

Sorry for not responding sooner, was making sure it could be easily reproduced. To save you the trouble, assuming it isn't already too late, here's a save file from a few moments before the bug takes place:

http://dffd.wimbli.com/file.php?id=757