I'm trying to make a chunk load system, can someone helps me?

Hey, i’m trying to make a chunk loading system, that loads a part in the playyer walking direction.

I dont know how to explain but i have a pic that can help me to explain

Basicaly a new chunk generates on the player direction and snap on the correct position, what i’m trying to figure out is, how do i get the side that the part needs to be loaded?