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Unofficial Cog Specs 1.2
(Take everything in here with a few grains of salt)
If this helps you in editing and creating Cog patches, I would appreciate it if you would give me
a little credit.
PATCH NOTE---Cog patches do not work with saved games
1.0:: This file covers most of the Symbols part of a .COG file, and a brief overview of Actors
and powerups code.
1.1:: More code info, flags, and a few new bins.
1.2:: Bin list is completely redone and complete. Also, more information on different cog types.
Clarified some of the code better. New info since version 1.1 is in (())
1. Cog basics
Cog is the programming language used in LucasArt's Jedi Knight game. It is used to determine
everything, from shield level and ammo, to what happens to any enemy when you hit it with a
lightsaber. Information used by the Cog language is stored in Bins.
JK level gobs contain all of the .COG files used in that level, which are then referenced by
the game to initiate specific events (INF glorified). It is very similar to Duke 3D .CON files.
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1.1 COG Types
Each .COG file is of a certain type: They are:
00_: ((Level Specific Cogs. These cogs are placed in the level gob, and the 00 is
replaced with the level number.))
actor_:Controls what happens to an enemy when events occur. Controls what happens when
it dies, is hit by a lightsaber, a Force Skill is used against it.
class_:Controls different events
Force_:Determines what happens when a Force power is used
Item_:Bacta tanks, wrenches, etc. Any non-weapon that you can use
Pow_:Power up: Anything that you pick up and keep: Ammo, weapons, shields.
Weap_:Weapon: the weapons that you use are defined by these.
This document focuses on pow_ and actor_ files
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1.2 Bins
As previously stated, bins store information used by the game. Bin information itself
(Values) are stored in the .plr file. in the form (bind bin# value flags). ((There are 116 bins
preprogrammed, with a maximum of 199.))
The following is a complete bin list:
Bin # min max flags Cog used
Weapon Bins:
none 0 0 0 0x004
fists 1 0 1 0x024 cog=weap_fists.cog
bryar_pistol 2 0 1 0x0a4 cog=weap_bryar.cog
stormtrooper_rifle 3 0 1 0x0a4 cog=weap_strifle.cog
thermal_detonator 4 0 30 0x0a4 cog=weap_thermdet.cog
tusken_prod 5 0 1 0x0a4 cog=weap_crossbow.cog
repeater 6 0 1 0x0a4 cog=weap_repeater.cog
rail_detonator 7 0 1 0x0a4 cog=weap_raildet.cog
sequencer_charge 8 0 30 0x0a4 cog=weap_seqcharge.cog
concussion_rifle 9 0 1 0x0a4 cog=weap_concrifle.cog
lightsaber 10 0 1 0x0a4 cog=weap_saber.cog
Ammo, etc:
energy 11 0 500 0x080
power 12 0 500 0x080
battery 13 0 200 0x020
forcemana 14 0 400 0x000
railcharges 15 0 30 0x080
Bonuses:
new_stars 16 0 32 0x000
spend_stars 17 0 32 0x000
choice 18 0 2 0x000
Force (Skill bins store number of stars:Rank is rank #):
jedi_rank 20 0 8.0 0x000 cog=force_well.cog
force jump 21 0 4.0 0x108 cog=force_jump.cog
force speed 22 0 4.0 0x108 cog=force_speed.cog
force seeing 23 0 4.0 0x108 cog=force_seeing.cog
force pull 24 0 4.0 0x108 cog=force_pull.cog
force healing 25 0 4.0 0x108 cog=force_heal.cog
force persuasion 26 0 4.0 0x108 cog=force_persuasion.cog
force blinding 27 0 4.0 0x108 cog=force_blinding.cog
force absorb 28 0 4.0 0x118 cog=force_absorb.cog
force protection 29 0 4.0 0x118 cog=force_protection.cog
force throw 30 0 4.0 0x108 cog=force_throw.cog
force grip 31 0 4.0 0x108 cog=force_grip.cog
force lightning 32 0 4.0 0x108 cog=force_lightning.cog
force destruction 33 0 4.0 0x108 cog=force_destruction.cog
force deadlysight 34 0 4.0 0x108 cog=force_deadlysight.cog
Items:
bactatank 40 0 5 0x102 cog=item_bacta.cog
irgoggles 41 0 1 0x102 cog=item_irgoggles.cog
fieldlight 42 1 1 0x122 cog=item_fieldlight.cog
keyimperial 43 0 1 0x042 cog=item_keyimperial.cog
wrench 44 0 1 0x042 cog=item_wrench.cog
datadisk 45 0 1 0x042 cog=item_datadisk.cog
keyred 46 0 1 0x042 cog=item_keyred.cog
keyblue 47 0 1 0x042 cog=item_keyblue.cog
keyyellow 48 0 1 0x042 cog=item_keyyellow.cog
wrchblue 49 0 1 0x042 cog=item_wrenchblue.cog
wrchyellow 50 0 1 0x042 cog=item_wrenchyellow.cog
keygreen 51 0 1 0x042 cog=item_keygreen.cog
shields 60 0 200.0 0x030 cog=item_shields.cog
force_armor 61 0 200.0 0x000
supershields 62 0 1.0 0x010 #cog=item_supershields.cog
powerboost 63 1.0 2.0 0x000
s_dark 64 0 1.0 0x000
s_light 65 0 1.0 0x000
revive 66 0 1.0 0x000
Scoring:
maxsecrets 71 0 20 0x000
peds_killed 72 0 1000 0x000
peds_total 73 0 1000 0x000
force_morality 74 -40 40 0x000
alignment 75 -100 100 0x000
Multiplay:
teamcolor 80 0 2 0x040
redflag 81 0 1 0x048
goldflag 82 0 1 0x048
redkey 83 0 1 0x042 cog=ctf_itemkeyred.cog
goldkey 84 0 1 0x042 cog=ctf_itemkeygold.cog
RESERVED BINS: 99 to 115
stringOffset 99 0 99999 0x000
goal00 100 0 1000 0x040
goal01 101 0 1000 0x040
goal02 102 0 1000 0x040
goal03 103 0 1000 0x040
goal04 104 0 1000 0x040
goal05 105 0 1000 0x040
goal06 106 0 1000 0x040
goal07 107 0 1000 0x040
goal08 108 0 1000 0x040
goal09 109 0 1000 0x040
goal10 110 0 1000 0x040
goal11 111 0 1000 0x040
goal12 112 0 1000 0x040
goal13 113 0 1000 0x040
goal14 114 0 1000 0x040
goal15 115 0 1000 0x040
hotkeyOffset 150 0 99999 0x000
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2. .COG files
.COG files are called Cog scripts. Each script has several parts. This is a look at each.
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2.1 Layout
The Cog Script layout is simple. It usually begins with a header like the following:
# Jedi Knight Cog Script
#
# filename.COG
#
# *Type* Script - Brief Description
#
# [Author's Initials]
#
# Copyright
(This is all ignored by the game, because it is preceded by #'s)
It is then followed by the symbols section, then finally, the Code section.
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2.2 Symbols
Symbols are used for a variety of reasons. Mostly, they are used as a way to skip a lot of
writing. They are written in the following form:
symboltype nameforsymbol local (Not for all types)
Here is a symbol list and a description of each type.
***************
2.2.1 thing
The thing symbol is used to indicate what the item using the script is, and what can trigger it.
Thing types include Player and powerup. ((Things are more specifically assigned to certain codes
in the Code section))
***************
2.2.2 int
int(integer) symbols are used to clarify what a word refers to. This includes bins, ammobins,
bin_contents, and autopickup. If there is no =, then the value is determined in the Code.
Therefore,
int bin=3 local
int ammobin=11 local
would set the engine to refer to bin 3 every time the word "bin" is mentioned in the code, and to
bin 11 when "ammobin" is used.
***************
2.2.3 sound
This specifies what sounds are to be played when a message is sent to the game. So
sound pickupsnd=thrmlpu2.wav local
sound respawnsnd=Activate01.wav local
would play the sound "thrmlpi2.wav" when the pickupsnd message is sent.
***************
2.2.4 flex
flex is used when the script causes something to change. For example:
flex amount local
indicates that the amount of the object affected by this script will change
***************
2.2.5 model
This is the name of the .3DO file used for a weapon.
***************
2.2.6 message
The messages that will trigger the script. Some include: Touched, taken, damaged, pulse, and
killed. Each message has a related section in the code part of the script.
***************
2.2.7 ai
This is used to indicate what, if any, AI should be triggered if something occurs. If it says
ai flee_ai=noweapon.ai local
it means that when the flle_ai is triggered, the noweapon ai kicks in. (This is used when a
weapon is Force Pulled away from an enemy)
***************
2.2.8 template
The template is the name of a file that appears after an event has happened. The Stormtrooper
actor_ script has the following for its templates:
template powerup=+DSTrifle local
template limb=+stormlimb local
The words "powerup" and "limb" are referred to in the code of the script.
((***************
2.2.9 model
(Saber code)
model povModel=sabv.3do local
model saberMesh=sabg.3do local
The povmodel is the thing shown in 1st person view. The mesh is the object shown in 3rd person view.
))
The symbol section is closed by a single
end
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2.3 Cog Code
This is where it all comes together. The commands that make magic, or at least, arms fall off.
As stated above, each message is usually coded at the bottom
***************
2.3.1 Basics
Cog script is not that complicated (HA! Actually, it really isn't) but once you study it for four
hours, it all starts to make sense. It reminds me of duke .con files a bit, and the more you
look over the different scripts, the more you'll understand.
2.3.2 Actors
To code the message "Damaged" for an actor:
First, the code is preceded by the word code.Then comes the message title, followed by a :. So
to code the message "damaged", you would have
code
damaged:
This would let the script know what is supposed to happen when the "damaged" message is sent.
Now comes the fun part: Deciding whether or not an arm should fall off. First, you must check to
see what amount of damage there is. To do this, use:
damage == getparam(0);
(some lines are followed by a ; )
Now, you begin if....else statements. So next you have
if(GetParam(1) == 16)
{
Which means "If damage cause is lightsaber <16> then do what is in {'s. So now,
assuming that this statement is true, you must tell it what to do next. The next thing in the
code is:
damage = (damage * 2.0);
victim = GetSenderRef();
if(GetThingHealth(victim) <= damage)
Which means damage is equal to damage times two (Doubles lightsaber damage) then it sets the word victim to represent the receiver of the attack
then it checks to see if the health of the victim is less than or
equal to the damage
Now there is a random chance that the limb will be cut off.
{
if(rand() < 0.05)
{
AmputateJoint(victim, 5);
newThing = CreateThingAtPos(limb, GetThingSector(victim), GetThingPos(victim), '0 0 0');
SetThingVel(newThing, '0.0 0.7 1.4');
Which means that if a random number is less than 0.05 then the victim's arm is cut off at
joint 5 then a new thing is created
which is the limb (as set above with the template symbol)<(limb, > in the victim's sector
at the victim's postion <'0 0 0');> then the location from it's
current position that it moves to So it drops 1.4
from where it was on the z plane, and .7 to on the X plane. Now, you must close up the three
ifs by using
}
}
}
Then close it with:
ReturnEx(damage);
Return;
Which returns except damage ; (Returns base damage).
***************
2.3.1 Powerups
Here is the Cog code for the lightsurge taken messge, copied and pasted, with my
(Note: the // is the comment part directly from the cog)
taken:
player = GetSourceRef();
powerup = GetSenderRef();
// Print("Light Surge");
jkPrintUNIString(player, 65);
AddDynamicTint(player, 0.0, 0.0, 0.2);
// Set mana amount to max.
SetInv(player, bin, GetInv(player, 20) * 50);
SetInv(player, 65, 1);
jkSetSuperFlags(4);
// Effect lasts 20 seconds, expand if already on.
KillTimerEx(1);
SetTimerEx(20, 1, player, 1);
SetTimerEx(20 - 3 * GetSoundLen(outsnd) - 0.55, 1, player, 0);
Return;
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MORE CODE STUFF
The things in ()'s are variables --- They change....
Here are some of the more basic codes, Not linked to any word in the code:
jkPrintUNIString(player, #)---Sends message to player that matches number given from
jkstrings.uni
PlaySoundThing(Soundname, thing, startingsoundvolume, variable, flag,)
ChangeSoundVol(channel, 0.8, 0.75) ---changes sound to .8 volume in .75 seconds
((Return; ---Stops the code: The same as END, only "Return" is used at the end of each message,
not just the end of the code.))
((ReturnEx; ---Returns the base damage taken by actor))
These are the symbols used in the code:
= ---used to indicate what a word in the code is linked to (
IE:player = GetLocalPlayerThing() means that wherever the word "player" is, it is
referring to GetLocalPlayerThing()
|| ---used to indicate OR
&& ---used to indicate AND
== ---used to indicate EQUAl TO
!= ---used to indicate NOT EQUAL TO
> ---used to indicate GREATER THAN
< ---used to indicate LESS THAN
=> ---used to indicate GREATER THAN OR EQUAL TO
<= ---used to indicate LESS THAN OR EQUAL TO
The following codes are often linked to a certain word.
getparam(0) ---Gets base damage
getparam(1) ---Gets weapon type
((type == # ---this is very similar to getparam(1), but it checks to see what the type of damage
was.))
((Types (used in "type ==" and get param(1) ) --- 2=Energy
4=Fire
16=Lightsaber
SetInvActivated(player, bin, value) ---Sets player bin to value (0 for off, 1 for on in force
powers)
GetLocalPlayerThing() ---The player, often set to the word player by using the =.
IsInvActivated(player, 21)--Checks to see if player bin 21 is in use
GetInv(thing, bin) ---returns the Bin value for the specified thing. (This is used in weapons
to see if there is ammo)
ActivateBin(thing, bin, value) ---Activates the 0 bin using the value (usually another bin number)
GetThingHealth(thing) ---Returns the Health of the specified thing
GetSenderRef() ---returns the "Sender" of message (IE: powerup, enemy, Player)
GetSourceRef() ---Returns the receiver of message
GetThingSector(thing) ---Will return the sector of thing
AttachThingToThingEx(thingtoattach, thingtoattachto, flag) ---Attaches something to something
else, so it stays with that thing (Force Armor to Player)
CreateThingAtPos(thing, sector, postition in sector, postition away from center of thing
(usually '0 0 0') ---creates a new thing at said position, then moves it to it's new position.
GetThingPos(thing) ---returns position of thing in ()'s
SetThingFlags(thing, flags) ---sets the flags of a thing to the specified flag
GetActorFlags(thing) ---Returns the Actor Flags for thing. (For player: IR Goggles on and off,
Field light on and off, etc.)
ClearActorFlags(thing, flag) ---removes the specified flag for the thing.
ChangeInv(thing, bin#, valuechangedby) ---Changes thing's bin value by the valuechangedby
(-1 subtracts 1 from value, etc.)
SetPulse(seconds) ---sets number of seconds between each "PULSE" message.
((AddDynamicTint(x.x, x.x, x.x) ---Flashes the screen the color determined by the
RGB values (x.x) ))
((GetAttachFlags(thing) ---Gets the Attachment flags for thing.))
((GetPhysicsFlags ---Gets physics flags for sector (Gravity, movement)
((SetInv(Thing, bin, new value) ---sets the specified bin to the new value.))
((print("Watch out"); ---Will print "Watch out"))
Flags:
These flags are used in bins and in code:
Misc Flags:
0x1000 ---makes object go boom when touched
Sound Flags:
0x80 ---Sound is activation Sound
0x81 ---Sound loops for duration
Force Flags:
0x800 ---Blinded
Joints:
0 = head
1 = neck
2 = torso
3 = primary weapon fire
4 = secondard weapon fire
5 = primary weapon aiming joint
6 = secondary weapon aiming joint
Brian Taylor
November 1st, 1997
Disclaimer: This document is notendorsed by LucasArts (duh) and I am not responsible for anything
you do to your game after reading this. .COG excerpts (C) LucasArts.
Thanks to the people who have helped with these specs.
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