How do I check if a tilemap is overlapping something?

on created, i need a tilemap overlapping another one to make it a child,

i need to know where this collection of blocks is. if there is another way, i welcome it.

buuut, id done with rooms after this! ..well... the location and size.. ill need to make them work next ,:D

Tilemap object doesn't have a check for overlap, so you'll have to work around that. It depends a little on what you are looking for. You can try "for each tile -> pick overlapping point" Or if you compare with another tilemap, compare the tiles.

But can I suggest something because I've seen you work on this project for a while. I think all of this should be driven by arrays instead of tilemaps. No doubt this is a great learning experience either way, but I've been in a very similar position before where I was kinda checking for overlaps etc. which was honestly a bit of a nightmare not only to code in the first place, but also to maintain. In the end it SOMEHOW worked (I have no idea how even lmao) but realistically arrays will be your savior. I wouldn't necessarily suggest reworking everything now but keep it in mind for maybe the next project :)