"Attempt to index global 'tr' (a nil value)"

[Noah]

I just want to add my bullets an impact effect ( when the bullets hit something ), but it keeps spamming errors...

function SWEP:PrimaryAttack()
	if ( !self:CanPrimaryAttack() ) then return end
	local bullet = {}
		bullet.Num = self.Primary.NumShots
		bullet.Src = self.Owner:GetShootPos()
		bullet.Dir = self.Owner:GetAimVector()
		bullet.Spread = Vector( self.Primary.Cone , self.Primary.Cone, 0)
		bullet.Tracer = 1
		bullet.TracerName = "AirboatGunTracer"
		bullet.Force = self.Primary.Force
		bullet.Damage = self.Primary.Damage
		bullet.AmmoType = (self.Primary.Ammo)
	local hit1, hit2 = tr.HitPos + tr.HitNormal, tr.HitPos - tr.HitNormal
	
	local effect = EffectData()
	util.Effect("HelicopterImpact", effect)
	self:ShootEffects()
	self.Owner:FireBullets( bullet )
	self:ShootEffects()
	self.Owner:FireBullets( bullet )
	self.Weapon:EmitSound(Sound(self.Primary.Sound))
	self:TakePrimaryAmmo(1)
	self.Weapon:SetNextPrimaryFire( CurTime() + self.Primary.Delay )
	self.Weapon:SetNextSecondaryFire( CurTime() + self.Primary.Delay )
	self.Weapon:SendWeaponAnim(ACT_VM_PRIMARYATTACK)
	self.Owner:MuzzleFlash()
	self.Owner:SetAnimation(PLAYER_ATTACK1)
	
end

[Darkwater]

You're referring to tr, but it doesn't exist.

[rejax]

You're not actually tracing a line

you can do
[LUA]
local tr = util.QuickTrace( Vector origin, Vector direction, entity or table filter )
[/LUA]

[url]http://wiki.garrysmod.com/page/util/QuickTrace[/url]

[Noah]

[QUOTE=rejax;42541656]You're not actually tracing a line

you can do
[LUA]
local tr = util.QuickTrace( Vector origin, Vector direction, entity or table filter )
[/LUA]

[url]http://wiki.garrysmod.com/page/util/QuickTrace[/url][/QUOTE]

local trace = {}
		trace.start = self.Owner:GetShootPos()
		trace.endpos = self.Owner:GetShootPos() + self.Owner:GetAimVector() * 20^14
		trace.filter = self.Owner
	local tr = util.TraceLine(trace)

Would that be ok too?

[Rubat]

20^14 is an overkill considering source map size limit is 1024*32

[Noah]

Ok got it, thanks