Could you expand a little on what exactly allows a tile to be placed? I did some realignment of my grid, but it just refuses to draw some tiles in places they should be allowed. This door for example. It seems like the gap between tiles didn’t line up correctly here. So I took all the meshes involved in that door, as a test and set them no collision. It still wouldn’t allow a tile to be drawn there. I even deleted all the involved meshes, leaving a perfectly open area, and it won’t draw anything there. If I then move my mesh slightly which puts a gap right where the wall would have been, it suddenly draws tiles, but i have no idea why that is necessary. To the right of that room, it’s drawing tiles no problem, out in the main area. I sort of get why it it might not want to lay a tile that is part way across the door, but I don’t understand why it refuses to draw a tile when the door is completely deleted from the level.I’ve even tried sliding the wall back so that it’s in a gap between two tiles and it won’t work.
I have the same issue at a second door, same mesh set, but a third door works just fine. So it isn’t an issue with the door itself.