Help me get started: Recoilless rifle

[Entharion]

I want to make a recoilless rifle swep,
This is a mounted one:
[url]https://armamentsales.sslpowered.com/photos/albums/userpics/10001/normal_Loading_M20_Recoilless.jpg[/url]

it's basically a tank cannon, but one that doesn't have recoil, hence "recoilless", and I want one as a swep, preferably a multi-barrel one...
you could also call it a railgun with explosive charge :P

but how do I get about doing this... I'd need some kind of base swep, most likely a rocket launcher with an extremely fast rocket that isn't affected by gravity and doesn't leave a trail, can anyone help me with that? :)

and I'd need to know how to import custom models and textures, I plan on making some with 3dsmax and Photoshop cs3...

[Entharion]

I would really appreciate it if people would actually comment, I know there's a lot of talented scripters out there who can give me a heads up on a tutorial or base swep of some kind...

[cloudwolf]

download gcfscape. run it. Go To steam/steamaps/accountname/ and open up the garrys mod gcf. Go to addons/counter-strike/lua/weapons and use one of the weapons for a base. Fiddle with the values. and Gmod wiki has a lot of functions.

[_Muffin]

This will probably not work because I haven't tested it, but anyhoo, this should get you started on the coding.

Make a folder in addons called Rocket Launcher or whatever.
Make another folder called lua.
In that folder make a folder called entities.
In that folder make a folder called rocket.
In that folder 3 lua files called init.lua, cl_init.lua and shared.lua.

Put this code in init.lua

function ENT:Initialize( )

      self.ThinkDelay = 0.10 -- Speed of the rocket (less = faster)
      self.BlastDamage = 130
      self:SetModel( "myrocket" )

end

function ENT:Think( )

      self:SetPos( self:GetPos( ) + self:GetForward( ) ) -- Fly forward
      self:NextThink( CurTime( ) + self.ThinkDelay )
      return true

end

function ENT:Touch( )
      
      -- Blow up
      local exp = ents.Create( "env_explosion" )
      exp:SetPos( self:GetPos( ) )
      exp:SetKeyValue( "iMagnitude", self.BlastDamage )
      exp:Spawn( )

      exp:Fire( "Explode", "", 0 )
      self:Remove( )

end

Put this code in cl_init.lua

include( "shared.lua" )

Put this code in shared.lua

ENT.Type = "anim"

Then go back to the folder addons/Rocket Launcher/lua and make a file called weapons.
In weapons, make a folder called 'rocket_launcher'.

In rocket_launcher, make 1 file called shared.lua
In shared.lua, put this code in:

if ( CLIENT ) then
    SWEP.PrintName = "Rocket Launcher thing"
   
end

SWEP.WorldModel = "yourrocketlauncherworldmodel.mdl"
SWEP.ViewModel = "yourrocketlauncherviewmodel.mdl"

function SWEP:Initialize( )

     if ( SERVER ) then
         self:SetHoldType( "ar2" )
     end

     self:SetDeploySpeed( 1 )

end

function SWEP:PrimaryAttack( )

     local vec = self.Owner:GetShootPos( ) + ( self.Owner:GetForward( ) * 25 )
     local proj = ents.Create( "rocket" )
     proj:SetPos( vec )
     proj:SetAngles( self.Owner:EyeAngles( ) )
     proj:Spawn( )

     self:SetNextPrimaryFire( CurTime( ) + 1 )

end

[Entharion]

Thank you both, I'll try to make something with this :)

(edit)

_muffin, I got it to work, but it's giving me an error while firing, it says there's an error on line 23 in shared.lua, that line is as follows:

     proj:SetPos( vec )

I'm not very familiar with lua scripting, but is vec a value, or are you calling a variable?

right click is also shotgun fire :P

[_Muffin]

[QUOTE=Entharion;16412344]
I'm not very familiar with lua scripting, but is vec a value, or are you calling a variable?

right click is also shotgun fire :P[/QUOTE]

Yeah, vec is a variable. Could you give me the full error please?

And for shotgun on right click just put this into init.lua of your weapon:

function SWEP:SecondaryAttack( )

end

[Entharion]

[QUOTE=_Muffin;16413036]Yeah, vec is a variable. Could you give me the full error please?

And for shotgun on right click just put this into init.lua of your weapon:

function SWEP:SecondaryAttack( )

end

[/QUOTE]

I have several errors for you:

when spawned
weapons/recoilless_rifle/shared.lua:12: attempt to call method 'SetHoldType' (a nil value)

while firing
Attempted to create unknown entity type rocket!
weapons/recoilless_rifle/shared.lua:23: Tried to use a NULL entity!
Can't find factory for entity: rocket

and I fixed the rightclick thingie

[_Muffin]

[QUOTE=Entharion;16413217]
when spawned
weapons/recoilless_rifle/shared.lua:12: attempt to call method 'SetHoldType' (a nil value)
(ok I fixed this I think, instead of self:SetHoldType I made it SWEP:HoldType)[/quote]

Ah, it's supposed to be self:SetWeaponHoldType.

[QUOTE=Entharion;16413217]

while firing
Attempted to create unknown entity type rocket!
weapons/recoilless_rifle/shared.lua:23: Tried to use a NULL entity!
Can't find factory for entity: rocket[/QUOTE]

2 things could've gone wrong here. Either you've placed the rocket entity in the wrong folder or (more likely) is that you've used a different name other than 'rocket' for your entity folder. The name of the folder corresponds to the actual entity made. So.. basically look in your addon folder under lua/entities and replace 'rocket' in init.lua with whatever that folder is called.

[Entharion]

[QUOTE=_Muffin;16413490]Ah, it's supposed to be self:SetWeaponHoldType.

2 things could've gone wrong here. Either you've placed the rocket entity in the wrong folder or (more likely) is that you've used a different name other than 'rocket' for your entity folder. The name of the folder corresponds to the actual entity made. So.. basically look in your addon folder under lua/entities and replace 'rocket' in init.lua with whatever that folder is called.[/QUOTE]

hmm, the rocket .lua's are in \recoilless_rifle\lua\entities\rocket\

so the name and location is right... isn't it?

[_Muffin]

[QUOTE=Entharion;16413674]hmm, the rocket .lua's are in \recoilless_rifle\lua\entities\rocket\

so the name and location is right... isn't it?[/QUOTE]

Does it actually make the rocket?

[Entharion]

[QUOTE=_Muffin;16414295]Does it actually make the rocket?[/QUOTE]

No, but I changed the code somewhat, here's what I got now:

if ( CLIENT ) then
    SWEP.PrintName 			= "Recoilless rifle"
   	SWEP.DrawAmmo			= false
	SWEP.DrawCrosshair		= true
	SWEP.ViewModelFOV		= 64
	SWEP.ViewModelFlip		= false
	SWEP.CSMuzzleFlashes	= false
	SWEP.PrintName			= "Recoilless Rifle"			
	SWEP.Author				= "Entharion"
	SWEP.Slot				= 4
	SWEP.SlotPos			= 3
	SWEP.Iconletter			= R
end

SWEP.WorldModel = "models/weapons/w_rocket_launcher.mdl"
SWEP.ViewModel = "models/weapons/v_RPG.mdl"
local SecShootSound = Sound("PropAPC.FireRocket")
SWEP.Spawnable			= false
SWEP.AdminSpawnable		= true

SWEP.Primary.Recoil			= 0
SWEP.Primary.Damage			= 50
SWEP.Primary.NumShots		= 1
SWEP.Primary.Cone			= 0
SWEP.Primary.Delay			= 1

SWEP.Primary.ClipSize		= 1
SWEP.Primary.DefaultClip	= 1
SWEP.Primary.Automatic		= false
SWEP.Primary.Ammo			= "shell"
SWEP.Primary.NextFire 		= 0
local ReloadNextFire 		= 1

function SWEP:Initialize()
	self:SetDeploySpeed( 1 )
    if ( SERVER ) then
		self:SetWeaponHoldType( self.HoldType )
    end
end

function SWEP:PrimaryAttack( )
	 local spawnpos = self.Owner:GetShootPos() + 32*self.Owner:GetForward() + 32*self.Owner:GetRight()
	 local ang = self.Owner:GetAimVector():Angle()
     local shell = ents.Create( "sent_shell" )
	 
	 shell:SetPos(spawnpos)
	 shell:SetAngles(ang)
	 shell:Spawn()
	 self:FireRocket(false,ShootSound, self.Owner)
     self:SetNextPrimaryFire( CurTime( ) + 1 )
end

function SWEP:SecondaryAttack( )

end

the error is now
weapons/recoilless_rifle/shared.lua:42: attempt to index global 'owner' (a nil value)

[Entharion]

ugh, anyone else know what the problem might be?

[Unrealomega]

[QUOTE=Entharion;16442552]ugh, anyone else know what the problem might be?[/QUOTE]

function SWEP:PrimaryAttack( )
	local spawnpos = self.Owner:GetShootPos() + 32*owner:GetForward() + 32*owner:GetRight()
	local ang = self.Owner:GetAimVector():Angle()
	local proj = ents.Create( "sent_shell" )

	rocket:SetPos(spawnpos)
	rocket:SetAngles(ang)
	rocket:Spawn()
	self:FireRocket(false,ShootSound, self.Owner)
	self:SetNextPrimaryFire( CurTime( ) + 1 )
end

You had "owner" instead of "self.Owner".

[Killer_Steel]

Hang on a second, self.Owner:GetForward(), why is he taking his current walking speed and multiplying it by 32 to make the rocket speed? Shouldn't it propel itself forward using self:ApplyForce()?

[Entharion]

[QUOTE=Unrealomega;16442959]

function SWEP:PrimaryAttack( )
	local spawnpos = self.Owner:GetShootPos() + 32*owner:GetForward() + 32*owner:GetRight()
	local ang = self.Owner:GetAimVector():Angle()
	local proj = ents.Create( "sent_shell" )

	rocket:SetPos(spawnpos)
	rocket:SetAngles(ang)
	rocket:Spawn()
	self:FireRocket(false,ShootSound, self.Owner)
	self:SetNextPrimaryFire( CurTime( ) + 1 )
end

You had "owner" instead of "self.Owner".[/QUOTE]

thank you! still do have errors in there

these:

weapons/weapon_base/init.lua:36: attempt to concatenate local 't' (a nil value)
Attempted to create unknown entity type sent_shell!
weapons/recoilless_rifle/shared.lua:46: Tried to use a NULL entity!
Can't find factory for entity: sent_shell

I updated the code, but I want to know is... what's the right syntaxes for lua, I can't seem to get it right :S

[editline]11:56PM[/editline]

[QUOTE=Killer_Steel;16443151]Hang on a second, self.Owner:GetForward(), why is he taking his current walking speed and multiplying it by 32 to make the rocket speed? Shouldn't it propel itself forward using self:ApplyForce()?[/QUOTE]
Actually, self.owner:getforward() is the position, not the speed... I dunno how or where to implement a fix for this... I'm a total newb xD

[Entharion]

No new suggestions? bummer.