exactly like path with one additional parameter you can edit. depth.
so like path you would type:
>path 1 3 20
this would set the path to stone, a width of 5 blocks and a depth of 20 blocks. That way you could start out some where above the area you want to build a wall (maybe by using path and then while it is on jumping up 20 times letting it build the area under you each time and raising you 20 blocks up above the area you started) and then walk straight out into the air but instead of just doing one block depth under and leaving nothing but air below that, would fill in the area to the ground with 20 levels of stone that is also 5 blocks wide.
I used path to create something similar to the great wall of china but this would save a lot of time since you would not have to do one layer of the wall at a time. just a quick way if made to construct places from castels to small houses quickly.
to note. I am personally using single player commands to modify a world so I can then run said world on a server, with quests that are possible, and secrets to be unlocked.also I might add that I am very thankful for the work you guys have put into making this a reality, I love this mod!
Private Mod Note
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Where to find voxel blocks since they keep taking down the links I posted