How to set tiles through code only where there is no tiles already drawn?

Question

Me and my teammate have recently been trying to get our procedurally generated maps to be polished and optimized. But we have run into a problem where the script that sets the cells to be the walls of the corridors does not collect the tiles that have been already drawn on layer 0 to the array where you get the used cells in the tile map, is there any way to fix this?

Answer 1

You might need to relayer your tilemap

Answer 2

You could try using the set_cell function at the coordinates to be invalid i.e setting it to a negative number, and then setting it again. I would look at additional documentation as I know it works for gridmaps

Answer 3

I think this tutorial may help: https://www.youtube.com/watch?v=d0Hb1Zs5GMQ