Issue with Wallmasks
I think - in the bhav for the tiles it looks to see if it requires a wallmask cutout - and then looks for the OBJF to do it. When you added the tiles, did you clone an existing objf and then renumber it? If so it may well still be linking to the existing wallmask and so you can clone the wallmask as well.
maybe post the object here?
Also, try looking at MaryLou's 4 tile window on MTS - its a template - that might also help.
I got rid of the CRES that I added which caused my game to crash, so it won't give you that problem. On second thought, I don't even think I need to mess with the CRES.
For the specific coordinates associated with wallmasks, there is a BHAV that says "wall cutout flag." I've made sure that the tiles I added also contain this BHAV, but I don't know how to link it to the wallmasks I cloned. Even so, I cloned the BHAV's from other tiles that most closely matched the position of the new tiles I was creating, to theoretically the BHAV for 3,2,1 should pull the wallmask for 2,2,1, which it is cloned from, but it doesn't even seem to be doing that.
I feel like this is the last piece of the puzzle. If I can figure out these wallmasks, then adding tiles to doors, windows, arches, etc. should be a "breeze" from here on out!
So far one thing that has stood out are the differences in the BHAV's. The windows are set up a little differently, with no "cutout flags," like the door, but its tricky to compare two different objects because sometimes there's more than one way to skin a cat.
Other than that, I need to study the CRES more. I can see how I think I do need to account for the new tiles there, but I must not have been getting it quite right. Other than that, I still don't see where the wallmasks are specifically linked anywhere. Maybe the CRES is what causes the extra tiles to recognize wallmasks?
There are a few doors on 2-tiles that have 3-tile custom versions. I want to study these as well to see if I notice differences there.
Unfortunately, it does not seem that it is as easy as replacing the values. When you click in the box and try to type something new, it doesn't let you. I have to figure out how those boxes are populated, and then change it.
The Instance that is shown instead of the correct instance appears to be totally random--I have not found anywhere else that that instance occurs. In the File box, it just says [unreferenced], and again, it doesn't let me type in the correct filepath.