[ACS](Solved)How can I detect when all monsters are dead?

This might work: https://zdoom.org/wiki/GetLevelInfo (check the example).

Use a WHILE loop to wait until they are dead to execute a script.

While (ThingCount(T_CYBERDEMON > 0) {

delay (1);

        SomeAction(Id, something, something);

} 

This will delay some action until monsters (cyberdemons) are equal to 0.

T_CYBERDEMON or T_NONE should do the trick, like this:

script 2 (void)
{
while(ThingCount(T_NONE, 100) > 0) <---since you tagged the spawned monsters to 100
    {
        Delay(1);
    }
    anyaction(x,x,x);
}

1 hour ago, Empyre said:

the replacements did not inherit the TID that I gave them,

That means that the gameplay mod was made really badly, otherwise the replacements would retain their TIDs. There is probably no generic way at all to refer to the original monsters with gameplay mods like this.

2 hours ago, scifista42 said:

That means that the gameplay mod was made really badly, otherwise the replacements would retain their TIDs. There is probably no generic way at all to refer to the original monsters with gameplay mods like this.

That's why I am now trying to find a way to detect that all monsters of all types are dead. What about ThingCount (T_NONE,0)? Would that count only monsters, or would it also count other things like trees, lamps, etc?

What leodoom and everennui said is what I did already. It works perfectly when there is no gameplay mod added.

Here's an idea: If a mod tries to break things, I could fall back to using a timer.

// beginning of an OPEN script
if (ThingCount(T_NONE,100) = 0)
{
  Delay(35*60*5); // 5 minutes
}
else
{
  while (ThingCount(T_NONE,100) > 0)
  {
    Delay(35); // Once a second should be often enough to check.
  }
};
// Do stuff ...

I would still rather be able to detect where there are any monsters of any kind alive than resort to a timer.

I think (T_NONE, 0) might do that. IIRC, all monsters are defaulted to zero unless tagged otherwise.

I was just coming here to report the results of my experiment with ThingCount(T_NONE,0) (nothing happened, ever), but I find the answer I was looking for.

I'll like your answer now, and come back and mark it as Best Answer if it works.

EDIT: YES! It works! Not only does it work, but it also doesn't count friendly monsters.

2 hours ago, Empyre said:

What about ThingCount (T_NONE,0)? Would that count only monsters, or would it also count other things like trees, lamps, etc?

ThingCount only counts things that are living monsters. That's why you can use it to check that monsters are killed (it doesn't count their corpses).

19 minutes ago, Gez said:

ThingCount only counts things that are living monsters. That's why you can use it to check that monsters are killed (it doesn't count their corpses).

When I tried ThingCount(T_NONE,0), nothing happened. Even when all hostile and friendly monsters were dead, the stuff that was supposed to happen when all monsters were dead didn't happen. That's OK because Blue Shadow's GetLevelInfo idea worked perfectly.