Bullet Callback function, how to make impact effects?

[luavirusfree]

Here's the section of code that matters:
[lua] local burret = {} burret.Attacker = self.Owner
burret.Num = self.Burrets
if self.Shot1 then
burret.Num = 2 -- I'm going to try to average the rounds per burst of the Helicopter, 5. This gun fires a lot faster, though, so I halved it.
else
burret.Num = 3 -- I will do that by alternating between 2 and 3 rounds, changing the setting at every new fire. Half of 5 is 2.5, but I can't use decimals.
end
burret.Src = self.Owner:GetShootPos()
burret.Dir = self.Owner:GetAimVector()
burret.Spread = Vector(self.Spread,self.Spread)
burret.Callback = function(DInf, hPos, Dir) -- <-- THIS IS WHERE THE CALLBACK STARTS
local EffectI = EffectData()
for i=1,#hPos do
EffectI:SetOrigin(hPos.i)
EffectI:SetStart(hPos.i)
end
for i=1,#Dir do
EffectI:SetNormal((-Dir.i):Normalize())
end
EffectI:SetMagnitude(8)
EffectI:SetRadius(3)
util.Effect( "cball_bounce", EffectI, true, true)
util.Effect( "StunstickImpact", EffectI, true, true)
end -- <-- THIS IS WHERE THE CALLBACK ENDS. THESE COMMENTS ADDED, AND ONLY HERE, TO HELP YOU.
burret.Hull = 6 -- Tiny, centered.
burret.Tracer = 1
burret.TracerName = self.Tracer
burret.Force = self.BurretForce
burret.Damage = math.random(self.DMGMin,self.DMGMax) -- The helicopter does 6 dmg to npc's, 3 to plr's. Let's cut the difference, but I can't use decimals so I switch between 4 and 5 on every shot. The difference is 4.5
burret.AmmoType = self.Primary.Ammo

if self.DoCrits then
if self.CanCrit then
burret.Damage = burret.Damage+(self.CritScale*burret.Damage)
-- self:EmitSound( Sound( "Weapon_SMG.SingleCrit" ) ) -- Criticals don't seem to work in a base.
end
end
-- I suppose I don't need the extra variable to see if we got a cirtical, "CanCrit", but whatever.

self.Owner:FireBullets( burret )

-- self:EmitSound( self.ShootSound )
self:SendWeaponAnim( ACT_VM_PRIMARYATTACK )

self:SetNextPrimaryFire( CurTime()+self.Primary.Delay )[/lua]

But I keep getting this error:

[ERROR] addons/chamberweapons/lua/weapons/cm_battery/shared.lua:234: attempt to get length of local 'Dir' (a userdata value)
1. unknown - addons/chamberweapons/lua/weapons/cm_battery/shared.lua:234
2. FireBullets - [C]:-1
3. unknown - addons/chamberweapons/lua/weapons/cm_battery/shared.lua:257

So how do I make those effects at the impact location without getting any errors? Right now it doesn't do a thing. I'd rather not start a new thread for this question, but I don't really have much of a choice right now.

I want to imitate the effect that is made when the Helicopter's Gun's Bullets hit something, but not all of the effects work, I know that those effects (cball_bounce and StunstickImpact) will work. I need help getting this working.

[editline]30th March 2013[/editline]

Okay, I guess no one is willing to help, eh? What are some weapons that create effects at their impact zone and don't fire straight?

[luavirusfree]

I'm not editing because editing kills Lua tags... I don't want all of my code to show up as one long ass line! I'm really going to need help here, I can't find a single swep that uses the modern code for Callback functions, as far as the wiki says there is no trace returned, but that would make this a hell-of-a-lot easier!

[RetTurtl3]

Hey Lua at least wait a week before bumping please, because many of us are busy in real life, or we're coding our own gamemodes and what not. real life comes first

[lua]EffectI:SetNormal((-Dir.i):Normalize())[/lua]

Try
[lua]EffectI:SetNormal((Dir:GetPos() - i):Normalize())[/lua]

It says a userdata so it has to be GetEyetrace or GetPos or something

[MakeR]

You are using the # operator on Userdata values (hPos and Dir).

[editline]31st March 2013[/editline]

That is what is causing the error.

[luavirusfree]

[QUOTE=RetTurtl3;40100606]Hey Lua at least wait a week before bumping please, because many of us are busy in real life, or we're coding our own gamemodes and what not. real life comes first

[lua]EffectI:SetNormal((-Dir.i):Normalize())[/lua]

Try
[lua]EffectI:SetNormal((Dir:GetPos() - i):Normalize())[/lua]

It says a userdata so it has to be GetEyetrace or GetPos or something[/QUOTE]

THAT WASN'T MY GOAL jeez!!! I didn't want to edit because it ruins anything in Lua tags!

[editline]30th March 2013[/editline]

[QUOTE=MakeR;40100702]You are using the # operator on Userdata values (hPos and Dir).

[editline]31st March 2013[/editline]

That is what is causing the error.[/QUOTE]

I know... how do I fix that? I don't think it matters, though, I need to know how to do this from scratch.

[editline]30th March 2013[/editline]

Also, if Dir is a direction, which it is, how would :GetPos() help??

[editline]30th March 2013[/editline]

The code has already changed, anyways...

[Chessnut]

Instead of :Normalize, try :GetNormal().

[MakeR]

If I understand what you are trying to achieve then this is what you need to do:

[lua]burret.Callback = function(DInf, hPos, Dir)
local EffectI = EffectData()

EffectI:SetOrigin(hPos)
EffectI:SetStart(hPos)
EffectI:SetNormal(-Dir)
EffectI:SetMagnitude(8)
EffectI:SetRadius(3)

util.Effect( "cball_bounce", EffectI, true, true)
util.Effect( "StunstickImpact", EffectI, true, true)
end [/lua]

[Kogitsune]

Why not just use SWEP:DoImpactEffect( tr, dmgtype )?

Just make sure to return true to block the default tracer

[luavirusfree]

<([{SNIP}])>

So it works like a charm using DoImpactEffect, thank you very, very much!!
[URL]http://youtu.be/vBhPCZEWLOE[/URL] It doesn't seem to want to embed it as a video, I just get this: [IMG]http://youtu.be/vBhPCZEWLOE[/IMG]