Dungeon Architect

@uced I didn’t end up using them, instead the tool rasterizes the rectangles and borders down to individual cells in code (loops and adds NxM unique individual cells to the PaintedCells array)

You can have a look at the tools on how they do this:


DungeonArchitectEditor\Private\Builders\Grid\EditorMode\Tools\GridDungeonEdToolRectangle.cpp [FGridDungeonEdToolRectangle::BuildDungeon]
DungeonArchitectEditor\Private\Builders\Grid\EditorMode\Tools\GridDungeonEdToolBorder.cpp [FGridDungeonEdToolBorder::BuildDungeon]