I slaved the targetable door from simlogical (the first one) to the value door.
The slaving worked fine, but it doesn't have a wallmask now.
The original one didn't contain a wallmask at all. It pointed to the original value door mesh and recolours, and must've also pointed to the according wallmask, although I can't find anything that would possibly have to do with that in the original (unedited) package. To slave it, I had to import a new mesh from a clone, and that's where I must have "broken" whatever linked the door to the right wall mask.
Now, how do I go about adding one? Getting the right wallmask from a clone would probably be the logical next step, but from there on I don't know how to get my slaved door to actually use it. I don't know which resource is responsible for pointing a door (window, ...) to the right wallmask. Where do I have to look?
Nvm me. Another one of these premature cries for help when the next best thing I try just magically makes it work for no apparent reason.