[Deji]

54 opcode discoveries have been made so far... and there are only 91 opcodes that are even partially unknown!

Lets finish before next year?

[fastman92]

http://gtagmodding.com/opcode-database.php?opcode=0477
Description of this 0477 opcode is completely wrong. Descriptions of actions executed of specified numbers don`t match.
I spent hour on testing what do these numbers do.
It is so:

0 - brake without lights
1 - brake with lights
2 - brake without lights
3 - drive back
4 - turn left wide
5 - turn right wide
7 - drive forward + turn left
8 - drive forward + turn right
9 - drive forward
10 - turn left slightly
11 - turn right slightly
13 - drive back + turn left
14 - drive back + turn right
19 - turn left slightly, flash the rear lights
20 - turn left slightly, switch rear lights on for 4 seconds
21 - turn right slightly, switch rear lights for 4 seconds
22 - drive back
23 - drive forward very fast
24 - switch lights on at animation time

This post has been edited by fastman92: Dec 8 2010, 09:12 PM

[Deji]

Car Struct

+0x3BB - [byte] Car Animation ID
+0x3BC - [probably dword] Car Animation Time


0x437C20 is a function which executes the car animations. Some ID's indeed aren't used.

[spaceeinstein]

In VC, the flags for 0477 are this:
0 brake, with brake lights
1 gentle brake
2 reverse
3 turn hard left and brake
4 turn hard right and brake
5 brake, no brake lights
6 turn hard left
7 turn hard right
8 forward
9 turn wide left (right for boat)
10 turn wide right (left for boat)

[fastman92]

What I discovered is that opcode about 0477 and 02C2:
0477 opcode requires a driver in a car in order to drive, until once 02C2 opcode is executed on that car.
Simply 02C2 makes car able to be driven without driver by 0477 once it is executed for this car.
Example:

SANNY

0407: store_coords_to 11@ 12@ 13@ from_car 0@ with_offset 0.1 0.0 0.0
02C2: car 0@ drive_to 11@ 12@ 13@
0477: set_car 0@ animation 9 time 6000

It would make car performs animation even when this car 0@ had no driver actor within car.

This post has been edited by fastman92: Dec 9 2010, 09:07 PM

[Deji]

New Opcodes!

048B makes the aimless car more deterministic (it will head for a particular place/route).
04BD flags the car as being part of a convoy, whose path seems to be created via 0994.
0878 sets the cars dirt level (from 0.0 to 15.0).
08F2 prevents the vehicle from being targetted with a heatseeker. Used make Toreno's heli the primary target in Toreno's Last Flight.
08F3 sets whether the player can get goodies (money, ammo) from the car. Used in the driving school mission to prevent the taxi from giving the player cash and the cop car from giving the player a shotgun.
0918 sets the vehicles engine state. It only works with an actor in and is the same as the CLEO opcode.
0957 sets whether actors can choose to use the car to evade gunfire.
09D9 detonates all satchel charges placed by the player (used in that Toreno mission where you drive up the plane ramp).

[Deji]

New Opcode!

0771 sets the license plate town number. Although I've yet to get it to work...

Edit: See here for a little hack to get it to work


Edit 2

New Opcode

0A21 prevents the ped-driven car from being affected by cheats (I think just the "insane handling" cheat, actually).

[DK22]

I've tested 0878, but it didn't work.

[Deji]

Indeed, the opcode functions that way, but the dirt level doesn't actually work.

This is probably a bug in the game, because Pay'n'Spray garages are also made to set the dirt level of the car, but the effect doesn't seem to apply. I believe there are mods around to fix this, though, so you could try using the opcode with one of those installed.

[Deji]

New Opcode!

0900 anchors the object, which locks its position. No idea why people started using it for strings..

[Adler]

Haha wait a minute... all it does is lock an object... but it stores strings too?? WTF!!!???

[Deji]

Opcode Update

0900 actually clears the last weapon damage... Maybe it affects the object position (if nothing hit it, it will "anchor"?).

[Adler]

Maybe it stores strings for some actual purpose. Could the opcode affect all objects with the name defined in the string?

[Deji]

No, this opcode does nothing besides set the object value. The use for strings was only done by modders and was probably not even chosen for any particular purpose.

[Adler]

Hmmm weird how it can be used to store strings. Oh well.

[Deji]

Opcode Update

0905 doesn't make the door openable unless you set the param to 0, so "locked" is a better way of saying it, I'd think.

[Deji]

It would seem that

SANNY

00DF:   actor $PLAYER_ACTOR driving

Actually tests to see if the actor is in a car, while

SANNY

0449:   actor $PLAYER_ACTOR in_a_car

Checks whether the actor is doing the task: TASK_SIMPLE_CAR_DRIVE (709) or TASK_SIMPLE_GANG_DRIVEBY (1022)

[Deji]

New Opcode!

09AB makes a character in the specified vehicle speak from an Ambient Speech ID. (UNTESTED!)

[Towncivilian]

I added many opcode descriptions to this wiki page.

[Deji]

Opcode Info

The type parameter for 060A chooses which .ped file is used as the new decision maker.

0 - "m_empty.ped"
1 - "m_norm.ped"
2 - "m_tough.ped"
3 - "m_weak.ped"
4 - "m_steal.ped"

The file is loaded afresh upon use of this opcode