How do Fallout 1 and 2 decide which enemies enter combat with you?

45hWa1k3r

First time out of the vault
The question might sound confusing, so let me clarify.

When you enter combat, you don't aggro all enemies on the map, right? Only those in the general vicinity.

Is this due to hard coding, in which groups of enemies are programmed to enter combat as a group of provoked? Or is there an algorithm that determined which enemies are aggroed, based on factors like distance or line of sight?
 
It is actually possible to enter sneak mode, and attack an NPC (in public) unseen, if you eliminate them during your first turn, before anyone else reacts.
It's considered a stealth kill.

I do not know this for fact [BIG IIRC], but there might be hostility per faction as well. In the Regulator fight, the town and the regulator gang will go hostile if your PC attacks the regulators first. In New Reno, fights in the streets can have disinterested bystanders amidst the combatants, that is until one of the bystanders gets harmed by intent or accident; resulting in their faction going hostile~~but not necessarily towards the PC if it wasn't the PC who attacked them.
 
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