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[Zereth]

I believe the current approach to building artificial obsidian things in seas/lakes is to pump magma out and drop it, sitting through endless cavein messages. I just thought of another way.

You build a mold above the water, and pump magma and water into it alternately to make obsidian, in the shape you want sitting on the bottom, then when you're done with that, collapse the mold. (Perhaps deconstructing much of it first so you're not stuck with blocks/stone/whatever sitting on the bottom you cant' get to.) The entire obsidian mass should cave-in once, settling to the bottom and allowing you greater control. (No problems with you pillar reacing to the surface and then being supported and just spreading an umbrella out over the top of the water, for example.)

It'd be a huge pain in the ass while we have the current construction interface, but does this sound like it'd work?

[Mephisto]

I don't imagine that would work too well. Currently, doesn't rock settle to the lowest available spot? Just say for the course of this thread that I wanted to make a giant "T" for something.

code:

TTTTT
  T
  T
  T

When disconnected from everything, I believe it will cave in and settle to

code:

  T
  T
  T
TTTTT

At least, that's happened to me before. Others may have had more experience with this kind of thing.

[Zereth]

I know that, but in order to get that underwater, you'd need to drop exactly one unit of magma on the four edge squares, then four in the middle, without any spreading. Doing it my way wouldn't let you make overhangs, but the magma drop method doesn't either unless you want it at the very top of the water. Mine would also let you wall off part of a lake or ocean and drain it if you wanted to.

[Kogan Loloklam]

I just use channels and a flow-bridge. I pour the form, then send my workers out to adjust it with channels.