Guys, is there any dfhack or another 3rd part way to revert tile changes and make them intact stone or ground again? For example, if you've dug a room and you don't like it anymore, is there any way to undo those actions and make that area intact and unexplored again?
As people said, you can make due with:
1- the liquids command. It enables you to paint obsidian walls at any given point.
2- the gui/liquids command. Same deal, but with a graphical user interface, that makes it much easier to designate large areas. Note however that you can't designate stuff at 3D - every level you want to fill with obsidian you need to do it one by one.
3- the tiletypes command. The previous commands left the tiles visible. tiletypes can revert that. Also, tiletypes can fill any given area with any "type" of material. However, tiletypes is also a very,
very crude hammer. The sequence of commands to fill a tile with stone and revert it to hidden, for instance, are the following:
paint mat stone - This sets the material to the biome's layer stone type
paint h 1 - This sets the visibility flag to "hidden"
paint sp normal - This sets the material special flag, so that it appears as unmined (not smoothed) stone
range x y z - The range, from the lower upper left corner of the cube, that the tiletypes command worksPressing Enter with the "k" cursor will activate the commands and turn every tile in range to what was specified. You can refine the sequence, if you only want to affect certain tiles (such as floors or fortifications).