How pathfinding in Doom works?

[Hellser]

It works, but it doesn't handle corners that well without even more checks.
This one chases normally when out of LOS for the sake of simplicity though.

And these blast points, too accurate for sand people. Only imperial storm troopers are so precise.

Quite nifty, however. Would like to see some monsters in the future using something like this.

[ibm5155]

Just wondering, is there a way to implemente a pathfinding using decorate/acs? like the player is under a x position, and the monster is at y, so the decorate or acs Spawn some objects where the monster will follow it and it'll guide it to the player. (or lets say, you order a monster to move to a specific location)