Structure void

[mataisfleis]

Is your feature request related to a problem? Please describe.
I want to create a room without any kind of block, but I have the PlaceAir property set to false, so the terrain overlaps with the room. However, if I change it to true, the structure generates very poorly and looks ugly
Describe the solution you'd like
I want it to support structural voids. If my schematic contains structure voids, when loading the structure, these structure voids would be replaced with air blocks and would not overlap with the terrain.

[Ma3-a]

I think you can achieve your goal by adding this to your structure yml.

SourceMask:
  Enabled: true
  NegatedBlockMask:
    - STRUCTURE_VOID

Maybe we could modify this issue to be a request for adding this to the default config when using /cstructure create. Can anyone think of a situation where you'd want to be pasting structure voids during world gen?