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[Oneir]

How does created obsidian react with the light/dark tags? On tile attributes
So I know from the Wiki that:
1) A tile which is made light cannot (currently) be made dark again
2) Natural walls/floors blocks the "ray" which makes a tile count as light
So these things together, will obsidian made from magma and water block tiles below it from turning aboveground?

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OOO
GGGObsidian made over natural ground.
The obsidian is counted as Inside Light Aboveground, the unmined ground is Inside Dark Subterranean.

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OOO
GSGIs the stair counted as light or dark?
Does anyone know or will I have to make something of my own to test this?

[Danarca]

I'll test it, been wondering about it myself and got the right location to do it

[TettyNullus]

From my recollection, you can't undo lighted tiles currently. And stairs underground that's not channeled out above counts as dark.

[Refar]

You can't undo light.
But artificial obsidian will prevent tiles below it from becoming light - if they are dug out after creating the obsidian layer.

[Oneir]

But artificial obsidian will prevent tiles below it from becoming light - if they are dug out after creating the obsidian layer.

That's what I was trying to find out. How sure of it are you? As in, "Read it somewhere, I think" or "Tried it out, that's how it works"?

[CobaltKobold]

No, I think what Refar meant is that the new "Artificial" obsidian works as well as the prior (soil?) floor at blocking the "light"- but it won't remo'e it any more than building a floor would, if you already exposed it to "the hated sun".

[Refar]

Yes. That's what i mean, an i am pretty sure of that - my dwarves dug the current fort completely into artificial obsidian (that they made).