Having a projectile execute a script upon an actor it hits

[Kinsie]

Hello! I'm making a weapon for DUMP3. DUMP3 doesn't allow the changing of enemies to do DamageType fun stuff. So I want to have an actor hit by this new weapon's projectile to execute a script that does the things I want it to do (checks properties like actor height, changes actor flags to make it frightened if small enough etc.). I asked TerminusEst13 about this, and he went into a spiel about seeker projectiles and custom inventory powerup doohickeys, but I'll be honest - it was in voice chat so absolutely none of it stuck in my mind and/or clipboard. Does anyone have any idea how I'd do this?

[ChronoSeth]

I managed to get this working. It does abuse A_SeekerMissile, but no custominventory shenanigans are needed.

Decorate:

---

Code: Select all

Actor FearGun : PlasmaRifle
{
	Weapon.SlotNumber 8
	Weapon.AmmoUse 20
	States
	{
		Fire:
			PLSG A 3 A_FireCustomMissile ("FearBall")
			PLSG B 20
			Goto Ready
	}
}

Actor FearBall : PlasmaBall
{
	Damage 0
	+SEEKERMISSILE
	States
	{
		Death:
			TNT1 A 0 A_SeekerMissile (0, 0, SMF_LOOK, 0, 1) // Sets the closest monster within a short range as the projectile's tracer.
			TNT1 A 0 ACS_NamedExecuteAlways ("Fear Gun Effect", 0) // See the script
			TNT1 A 0 A_Stop // Ensure the projectile doesn't drift off because of A_SeekerMissile.
			Goto Super::Death
	}
}

ACS:

---

Code: Select all

Script "Fear Gun Effect" (void)
{
	SetActivator (0, AAPTR_TRACER); // The script's activator is now the projectile's tracer, which should be whatever monster it hit.
	SetActorProperty (0, APROP_FRIGHTENED, 1); // You should be able to do whatever you want here.
}

[Kinsie]

Thanks, but I managed to figure this out. I ended up using A_RadiusGive, which was a lot simpler.

[jpalomo]

In ChronoSeth's example, you can use +HitTracer on the FearBall instead of +SeekerMissile and A_SeekerMissile. You can then put the ACS call in a XDeath state to avoid calling it whenever the projectile hits terrain.

[ChronoSeth]

A_RadiusGive

I was going to suggest that, but it has one problem:

Note that the receiving actor's center point must be within the radius specified by the distance parameter, otherwise it won't receive the item.

I suppose that might not matter depending on how you set it up, though.

In ChronoSeth's example, you can use +HitTracer on the FearBall instead of +SeekerMissile and A_SeekerMissile.

Ah, I didn't know about that flag. That's definitely a better way of doing things.

[The Zombie Killer]

I was going to suggest HITTRACER when this thread was first posted, but then noticed that the purpose of the question was for DUMP3, which requires Zandronum 3.0 support. Unfortunately, Zandronum 3.0 does not have support for any of the HIT* flags, as far as I know.

[Leonard2]

Unfortunately, Zandronum 3.0 does not have support for any of the HIT* flags, as far as I know.

Not yet.

[NeuralStunner]

I was going to suggest HITTRACER when this thread was first posted, but then noticed that the purpose of the question was for DUMP3, which requires Zandronum 3.0 support. Unfortunately, Zandronum 3.0 does not have support for any of the HIT* flags, as far as I know.

Indeed, I had to set aside a weapon idea for the same reason. (Though in my case I could probably get away with using ye olde A_Explode hackke.)