Welcome to the ZDoom Forums!

How does the AI prevent monsters from seeing the corpses of friendly monsters? Does it check for the "Corpse" flag?

If so, would removing that flag and setting the "Friendly" flag on monsters when they die allow the AI to be alerted when coming across another dead monster? Or is there an easier way to do this?

I am pretty sure monsters don't detect friendly monsters at all for performance reasons.
If you want to make monsters see dead monsters, here's how I did it in my mod:

Spoiler:

---

Code: Select all

Override void Tick()
{
	Super.Tick();
	If(health>0)
	{
		For(let i = BlockThingsIterator.Create(self,256); i.Next();)
		{ //Iterate through all things within 256 map units
			Actor other = i.thing;
			If(other==self)
			{Continue;} //If the found thing is the monster itself, skip
			double distance = Distance3D(other);
			If(distance>256)
			{Continue;} //If distance is greater than 256, skip
			Actor prevtarg = target;
			target=other //Temporarily change the monster's target while saving the previous one
			If(other.bISMONSTER && other.health<1 && CheckIfTargetInLOS(90))
			{ //If the thing is a monster with less than 1 health (dead) and it's in the monster's cone of vision, continue
				target=other.target; //Set the target as the dead monster's target
				A_AlertMonsters(1); //Alert itself to start the chase
			}
			Else{target=prevtarg;} //If previous check fails, reset the target
		}
	}
}

Put this Tick override within your monster's class in ZScript.
Or rather this is modified code that I'm not 100% sure will work, but it still might be a good start.

I was curious what mod you were referring to, and just found Lost Frontier, is that a separate campaign for Strife or is it a gameplay mod? Because Strife is where I was planning to use it.

(Though this code is probably still good as a modder's resource, thank you!)