Does an angled wall structure count as an enclosed room? Example..like following a road or a rock face so there are no "L shaped" walls...
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Open diagonals do not break a "room". You can build a square missing its corners and it will still work. You can even build rooms in a diamond shape with ugly jagged diagonal walls, and that will work.
Do note for the purpose of heating it counts the edges of a room, and a diagonal wall has every single square counting as an edge making heating and cooling less efficient.