How to spawn a prop in lua?

[MR.COW]

I am trying to make a vgui thng that spawns props, so far i have:
menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
menu1:DoClick = function ( ball )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetPos())
prop:Spawn()
` end

Also i think i might of messed up the doclick, is it ok?

[boxama]

You have missed the fact that you are attempting to spawn an entity clientside, which the client is not allowed to do. You must use the [url=http://wiki.garrysmod.com/page/Net_Library_Usage]net library[/url] for this. Example:
[lua]
if SERVER then

util.AddNetworkString( "SpawnProp" )

net.Receive( "SpawnProp", function( length, ply ) // net.Receive() passes the length of the message and the player, so this is where you can get the player from

local ent = ents.Create( "prop_physics" )
ent:SetModel( net.ReadString() or "models/props_phx/cannonball_solid.mdl" ) // You can net.WriteString( model ) the model to the server
ent:SetPos( ply:GetEyeTrace().HitPos ) // I'd also recommend spawning the prop where the player is looking at
ent:Spawn()

end )

else

// Derma stuff (clientside)
menu1.DoClick = function()
net.Start( "SpawnProp" )
net.SendToServer()
end

end
[/lua]

[Rubat]

 tags, use them.

Clientside:

menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
function menu1:DoClick( ball )
net.Start( "doShit" )
net.SendToServer()
end

Serverside:

util.AddNetworkString("doShit")
net.Receive("doShit", function( len, ply )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetEyeTrace().HitPos )
prop:Spawn()
end )

[MR.COW]

Im doing something wrong please could help me out? Im new to lua

[QUOTE]local Form = vgui.Create( "DFrame" )
Form:SetPos( 5, 5 ) -- Position form on your monitor
Form:SetSize( 300, 150 ) -- Size form
Form:SetTitle( "Scripts" ) -- Form set name
Form:SetVisible( true ) -- Form rendered ( true or false )
Form:SetDraggable( true ) -- Form draggable
Form:ShowCloseButton( true ) -- Show buttons panel
Form:MakePopup()

menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
menu1:DoClick = function ( ball )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetPos())
prop:Spawn()
if SERVER then

util.AddNetworkString( "SpawnProp" )

net.Receive( "SpawnProp", function( length, ply )

ent = ents.Create( "prop_physics" )
ent:SetModel( net.ReadString() or "models/props_phx/cannonball_solid.mdl" ) // You can net.WriteString( model ) the model to the server
ent:SetPos( ply:GetEyeTrace().HitPos ) // I'd also recommend spawning the prop where the player is looking at
ent:Spawn()

end )

else

// Derma stuff (clientside)
menu1.DoClick = function()
net.Start( "SpawnProp" )
net.SendToServer()
end

end
end[/QUOTE]

[Rubat]

Darn you, Ninja1001.

[editline]22nd February 2014[/editline]

Darn automerge.

[MR.COW]

:D

[editline]22nd February 2014[/editline]

This is what i have now, stille errors in game:

menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
function menu1:DoClick( ball )
net.Start( "doShit" )
net.SendToServer()

util.AddNetworkString("doShit")
net.Receive("doShit", function( len, ply )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetEyeTrace().HitPos )
prop:Spawn()
end )
end

[Rubat]

[QUOTE=MR.COW;44008373]:D

[editline]22nd February 2014[/editline]

This is what i have now, stille errors in game:

menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
function menu1:DoClick( ball )
net.Start( "doShit" )
net.SendToServer()

util.AddNetworkString("doShit")
net.Receive("doShit", function( len, ply )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetEyeTrace().HitPos )
prop:Spawn()
end )
end[/QUOTE]
You saw my post? You see that piece of code with a text above it says "serverside"? Clientside is where you create your panels and similar stuff. ( cl_init namely ). Serverside is where you can/must spawn your entities, etc, namely init.lua. Show us EXACTLY where do you put all this code into, what file, where is the file located.

[MR.COW]

it is in garrysmod/lua its called gui.lua and here is everything thats in it, its one file:

local Form = vgui.Create( "DFrame" )
Form:SetPos( 5, 5 ) -- Position form on your monitor
Form:SetSize( 300, 150 ) -- Size form
Form:SetTitle( "Scripts" ) -- Form set name
Form:SetVisible( true ) -- Form rendered ( true or false )
Form:SetDraggable( true ) -- Form draggable
Form:ShowCloseButton( true ) -- Show buttons panel
Form:MakePopup()

menu1 = vgui.Create("DButton") -- Create the button
menu1:SetParent( Form ) -- Set the parent to Form
menu1:SetVisible( true ) -- Make the button true
menu1:SetSize( 100, 20 )
menu1:SetText( "Spawn an Exploding ball" )
menu1:SetPos( 5, 30 )
function menu1:DoClick( ball )
net.Start( "doShit" )
net.SendToServer()

util.AddNetworkString("doShit")
net.Receive("doShit", function( len, ply )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetEyeTrace().HitPos )
prop:Spawn()
end )
end

menu2 = vgui.Create("DButton") -- Create the button
menu2:SetParent( Form ) -- Set the parent to Form
menu2:SetVisible( true ) -- Make the button true
menu2:SetSize( 100, 20 )
menu2:SetText( "Aimbot" )
menu2:SetPos( 5, 60 )
function menu2:DoCLick ( jump )
local bhop = { };
bhop.MetaPlayer = FindMetaTable( "Player")
bhop.oldKeyDown = bhop.MetaPlayer['KeyDown']
local bhopOn = true;
local bhopSOn = true;
local bhopHooks = { hook = { }, name = { } };
bhop.left = false
bhop.right = false
bhop.jump = false
bhop.what = true
function bhop.AddHook(hookname, name, func)
table.insert( bhopHooks.hook, hookname );
table.insert( bhopHooks.name, name );
hook.Add( hookname, name, func );
end
bhop.MetaPlayer['KeyDown'] = function( self, key )
if self != LocalPlayer() then return end
if (key == IN_MOVELEFT) and bhop.left then
return true
elseif (key == IN_MOVERIGHT) and bhop.right then
return true
elseif (key == IN_JUMP) and bhop.jump then
return true
else
return bhop.oldKeyDown( self, key )
end
end

function bhop.spamjump()
bhop.what = false
bhop.jump = true
timer.Simple(.05, function()
bhop.jump = false
timer.Simple( .25, function()
bhop.what = true
end)
end)
end

local oldEyePos = LocalPlayer():EyeAngles()--This is to see where player is looking
function bhop.CreateMove( cmd )
local JumpReleased = false;
if (cmd:KeyDown( IN_JUMP )) then

if (!JumpReleased) then
if (bhopOn && !LocalPlayer():OnGround()) then --Bhop here
cmd:RemoveKey( IN_JUMP );
if bhop.what then
bhop.spamjump()
end
end
else
JumpReleased = false
end

if(bhopSOn ) then--auto strafer
local traceRes = LocalPlayer():EyeAngles()

if( traceRes.y > oldEyePos.y ) then --If you move your mouse left, walk left, if you're jumping
oldEyePos = traceRes;
cmd:SetSideMove( -1000000 )
bhop.left = true
timer.Simple(1, function() bhop.left = false end)
end

if( oldEyePos.y > traceRes.y ) then --If you move your mouse right, move right, while jumping
oldEyePos = traceRes;
cmd:SetSideMove( 1000000 )
bhop.right = true
timer.Simple(1, function() bhop.right = false end)
end
end
elseif (!JumpReleased) then
JumpReleased = true;
end

end

bhop.AddHook( "CreateMove", tostring(math.random(0, 133712837)), bhop.CreateMove )--add the hook
concommand.Add( "bhop", function () --Toggler
if bhopOn then
print("Bhop off")
bhopOn = false;
else
print("Bhop on")
bhopOn = true;
end
end )
concommand.Add( "bhop_strafe", function ()
if bhopSOn then
print("Strafe off")
bhopSOn = false;
else
print("Strafe on")
bhopSOn = true;
end
end)
concommand.Add("bhop_unload", function()
for i = 1, #bhopHooks.hook do
hook.Remove( bhopHooks.hook[i], bhopHooks.name[i] );
print( "Unhooked "..bhopHooks.hook[i].." using name "..bhopHooks.name[i] );
end
concommand.Remove("bhop_strafe")
concommand.Remove("bhop")
bhopOn = false;
bhopSOn = false;
print("Bhop unloaded")
table.Empty( bhopHooks )
concommand.Remove( "bhop_unload" )
end)
end

PANEL = {}

function PANEL:Init()
self:SetSize( 100, 100 )
self:Center()

end

function PANEL:Paint( w, h )
draw.RoundedBox( 0, 0, 0, w, h, Color( 0,0,0,255 ) )
end

[Rubat]

It's like you completely ignored what I said about

 tags. Create a file in lua/autorun/server/myfile.lua and put serverside stuff into it. Create a file in lua/autorun/client/myfile.lua and put clientside stuff into it.

[boxama]

Make a new file in autorun/server, this is where you can run server functions (like entity spawning). This is where you would put this:
[lua]util.AddNetworkString("doShit")
net.Receive("doShit", function( len, ply )
local prop = ents.Create( "prop_physics" )
prop:SetModel( "models/props_phx/cannonball_solid.mdl" )
prop:SetPos( ply:GetEyeTrace().HitPos )
prop:Spawn()
end )[/lua]

Now for a little info about 'realms'.
If you place files in lua/autorun they will be run by both the client and the server. There is the autorun/server and autorun/client folders there to make sure only one runs it.
In a shared file, to prevent either realm from running functions that it can't (which would cause errors) you would use a check like this:
[lua]
// This is shared code
if SERVER then
// This is server-side code
else
// This is clientside code
end
// This is also shared code
[/lua]
The global variable 'SERVER' is only defined server-side, meaning that the client would only run what is in the 'else' statement. The opposite applies to the 'CLIENT' variable.

You can check the realms of all functions in any wiki. If you're using an old wiki, a yellow box would indicate client, and blue would indicate server. If there are both, then it is shared, and can be used in either. In the new wiki, there is a little bar near the bottom of the page with links referring to the sections the function belongs to. You can also see the realm it belongs to there:
[IMG]http://i.imgur.com/dDDNsaa.jpg[/IMG]
I hope this was educational for you.

[MR.COW]

Oh thanks guys :D