I want to create a microdungeon where some tiles have air foreground and worldgen-selected background (so that it blends with the world, and looks as if someone just dug through it). As far as I can tell, using TMX-style dungeons does not allow this, as it only provides: Background AND/OR foreground Biome variant #1 Background AND/OR foreground Biome variant #2 Background AND/OR foreground Biome variant #3 Background AND foreground worldgen-selected (via leaving the tile empty in the foreground, and using magic pink for the background) I know this is possible with PNG-based microdungeons, by using the following ".dungeon" json brush config: Code: { "value": [200, 200, 200, 255], "comment": "Clear foreground, leave background as-is", "brush": [["clear"], ["surfacebackground"]] } Apparently this doesn't work either.
I figured it out, the following brush will leave the background and clear the foreground, allowing microdungeons to seamlessly blend with the surrounding terrain. Code: { "brush": [["front", "metamaterial:empty"]] }