Comments (1)
Hi.
This error means that the precondition has returned an empty domain for certain cell.
I.e. it says "I don't know any tile that can be placed here".
If dungeon precondition is the only precondition set up, this is most likely because it could not find any wall tiles.
Try using this revision of addons/wfc/problems/2d/preconditions/precondition_2d_dungeon.gd.
If that's the issue, a different assertion (with more meaningful message) will fail.
It also can be an interference between multiple preconditions or between precondition and edge condition, if you do specify one.
from godot-constraint-solving.
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