Newb Question: What causes Damage in A_CustomMissile

[eharper256]

Hi there, I'm just looking studying various DECORATE etc. in some of my favourite mods to see how they work, and one of the big ones is I'm wondering how A_CustomMissile causes damage.

Obviously, for A_Firebullets, the wiki states the 3rd/4th integer determines projectiles/damage, so in the example

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TRIF A 5 Bright A_FireBullets(0, 0, 1, 45, "RiflePuff")

The rifle shot here is doing 1 shot of 45 damage. And...

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CHAF A 1 BRIGHT A_FireBullets(4, 4, 1, 9, "MachineGunBulletPuff", 1)

This Chaingun from Brutal Doom is dealing 9 damage, etc.

So, how does this Weapons of Saturn Chaingun work? (Hold State)

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	TNT1 A 0 A_JumpIfInventory("NatoBelt",1,1)
		Goto ReloadCheck
		TNT1 A 0 A_AlertMonsters
		TNT1 A 0 A_SetPitch(pitch - 0.1)
		TNT1 A 0 A_PlaySound("weapons/chaingun/spin",7)
		TNT1 A 0 A_TakeInventory("NatoBelt",1,TIF_NOTAKEINFINITE)
		VLCS A 1 A_FireBullets(3, 2, -1, 1, "BulletPuff", 0)
		VLCS B 1 A_Firecustommissile("ChaingunCasingSpawner",0,0,-12,-18)
		TNT1 A 0 A_ZoomFactor(0.996)
		TNT1 A 0 A_SetPitch(pitch + 0.1)
		VLCS C 1 A_FireBullets(3, 2, -1, 0, "BulletPuff", 0)
		TNT1 A 0 A_Firecustommissile("ChaingunCasingSpawner",0,0,-12,-18)
		TNT1 A 0 A_ZoomFactor(0.999)
		TNT1 A 0 A_SetPitch(pitch - 0.2)
		TNT1 A 0 A_GunFlash
		TNT1 A 0 A_TakeInventory("NatoBelt",1,TIF_NOTAKEINFINITE)
		VLCS D 1 A_FireCustomMissile("ChaingunTracer",FRandom(-1.0,1.0),0,0,-1,0,FRandom(-1.0,1.0))
		TNT1 A 0 A_SetPitch(pitch + 0.2)
		TNT1 A 0 A_TakeInventory("NatoBelt",1,TIF_NOTAKEINFINITE)
		VLCS A 1 A_FireBullets(3, 2, -1, 1, "BulletPuff", 0)
		TNT1 A 0 A_Firecustommissile("ChaingunCasingSpawner",0,0,-12,-18)
		TNT1 A 0 A_ZoomFactor(0.996)
		VLCS B 1 A_FireBullets(2, 2, -1, 0, "BulletPuff", 0)
		TNT1 A 0 A_Firecustommissile("ChaingunCasingSpawner",0,0,-12,-18)
		TNT1 A 0 A_TakeInventory("NatoBelt",1,TIF_NOTAKEINFINITE)
		VLCS C 1 A_FireBullets(3, 2, -1, 8, "BulletPuff", 0)
		TNT1 A 0 A_ZoomFactor(0.998)
		TNT1 AA 0 A_FireCustomMissile("GunSmokeSpawner",0,0,0,0)
		VLCS D 1 A_Firecustommissile("ChaingunCasingSpawner",0,0,-12,-18)
		TNT1 A 0 A_TakeInventory("FiringTracer",1)
		TNT1 A 0 A_ReFire
		TNT1 A 0 A_PlaySound("weapons/chaingun/stop",6)
		TNT1 A 0 A_ZoomFactor(1.0)
		VLCS ABCD 1
		TNT1 AAAA 0 A_FireCustomMissile("GunSmokeSpawner",0,0,0,-4)
		VLCS ABCD 2
		VLCN ABC 2 A_WeaponReady
		TNT1 AA 0 A_FireCustomMissile("GunSmokeSpawner",0,0,0,1)
		VLCN DABCDA 3 A_WeaponReady
		VLCS BCD 2 A_WeaponReady
		Goto ReadyII

The AFireBullets has -1 defined in its projectile numbers? What causes the damage here? Is it the tracer?

[Arctangent]

Normally, if A_FireBullets is only set to fire a single bullet, it'll ignore bullet spread unless the player holds down the fire button after A_Refire is called - if you've ever heard of chaingun sniping, this is the cause of it. -1 ignores this and causes the bullets to spread the moment you start firing.

Which is to say, it's not actually firing less than zero bullets, it's firing one.

As far as the question you're asking, though, projectiles don't rely on the action function creating them to set their damage, rather they define their own damage in their actor definition.

[ramon.dexter]

For a batter explanation: The projectile works as projectiles in real world. Normally, weapons in real dont cause any damage. All the damage is done by the projectile they shoot. So, rocket launcher doesnt do any damage. The damage is dome by the rocket (better said, by the explosive in the rocket, but that's detail).

[eharper256]

Right, yes. I see.

Good to know (-1) is just a function to incite bullet spread.

In fact, I could have answered part of my own question if I had not been so adamant at looking at A_CustomMissile itself, since the tracers below do specify direct damage it seems, lol.

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ACTOR ChaingunTracer : Tracer
{
	Damage (random(1,2))
	Speed 260
}

ACTOR RotaryPlasma : BlueTracer
{
	Damage (random(6,10))
	Speed 160
}

So the tracer is doing 1-2 damage, and the plasma version 6-10.
And there's also an explode function that presumably does 40 damage over 100 area below that:

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TNT1 A 0 A_Explode (40,100,(0))

Thanks for the help.