[ikkentim]

Hello Everyone,

I am trying to read the position of the car you are currently in.
I know the basics of how memory reading works etc, but I can't properly figure out how to read the values from the vehicle's position...

I found some reference here:
http://www.gtamodding.com/index.php?title=...esses_(SA)#Cars

There it says the following things:

QUOTE

0xB6F980 - Is the direct pointer to the pool start (CVehicle) 0xBA18FC - Current vehicle pointer 0x969084 - First vehicle you got into xB74494 - Contains a pointer to main struct This struct: +0 = Contains a pointer to the first element in the pool +4 = Contains a pointer to a byte map indicating which elements are in use +8 = [dword] Is the maximum number of elements in the pool +12 = [dword] Is the current number of elements in the pool Each vehicle object is 2584 (0xA18) bytes. It starts at 0xC502AA0. For each vehicle in the pool: +20 = [byte] Contains a pointer to the rotation/position matrix (84 bytes): +0 = [float] X-axis Rotation (Grad) +4 = [float] Y-axis Rotation (Grad) +8 = [float] Z-axis Rotation (Grad) +16 = [float] X-axis Rotation (Looking) +20 = [float] Y-axis Rotation (Looking) + 24 = [float] Z-axis Rotation (Looking) +48 = [float] X-axis Position +52 = [float] Y-axis Position +56 = [float] Z-axis Position

I tried taking where 0xBA18FC points to, then adding 68 to it, but no success...
Does anyone have any experience with this?

Thanks in advance!
ikkentim

PS.
I'm new here
Forgot [Q] before the title

This post has been edited by ikkentim on Thursday, May 10 2012, 17:07

[Bad.boy!]

Could you explain what you are making, some kind of trainer or a cleo/scm script. Because in cleo you can use:

CODE

0811: 0@ = actor $PLAYER_ACTOR car // versionC

[ikkentim]

QUOTE (Bad.boy! @ Thursday, May 10 2012, 17:27)

Could you explain what you are making, some kind of trainer or a cleo/scm script. Because in cleo you can use: CODE 0811: 0@ = actor $PLAYER_ACTOR car // versionC

No, I just want the data, so I can calculate the cars location and show it on an lcd screen. When I know how to get the vehicle's position, I also know how to calculate the speed of the vehicle, since that will be very easy to calculate too then.

[Bad.boy!]

How about:

CODE

02E3: 6@ = car 0@ speed 00AA: store_car 0@ position_to 3@ 4@ 5@

"distance = ▲velocity * ▲time" is to much calculating.
"▲ = end - begin" can't find the proper character

Also it's in 3d so that would be even more calculating, and there's a memory adress for speed too.

This post has been edited by Bad.boy! on Thursday, May 10 2012, 17:54

[ikkentim]

QUOTE (Bad.boy! @ Thursday, May 10 2012, 17:51)

How about: CODE 02E3: 6@ = car 0@ speed 00AA: store_car 0@ position_to 3@ 4@ 5@ "distance = ▲velocity * ▲time" is to much calculating. "▲ = end - begin" can't find the proper character Also it's in 3d so that would be even more calculating, and there's a memory adress for speed too.

As I said, I want to do it by reading memory

[Bad.boy!]

I'm really bad in memory adresses, but the current vehicle is: CPed +0x58C.

[fastman92]

CODE

{$CLEO} 0000: NOP :velocity wait 0 if Actor.Driving($PLAYER_ACTOR) else_jump @velocity 0811: 0@ = actor $PLAYER_ACTOR car_nosave 0A97: 1@ = car 0@ struct 1@ += 0x44      // RwV3D m_vVelocity: X 0A8E: 2@ = 1@ + 4 // int   ; m_vVelocity: Y 0A8E: 3@ = 1@ + 8 // int   ; m_vVelocity:: Z    while Actor.Driving($PLAYER_ACTOR)    wait 0        0A8D: 4@ = read_memory 1@ size 4 virtual_protect FALSE    006B: 4@ *= 4@  // (float)        0A8D: 5@ = read_memory 2@ size 4 virtual_protect FALSE        006B: 5@ *= 5@  // (float)    005B: 4@ += 5@  // (float)        0A8D: 5@ = read_memory 3@ size 4 virtual_protect FALSE        006B: 5@ *= 5@  // (float)    005B: 4@ += 5@  // (float)        01FB: 4@ = square_root 4@    4@ *= 50.0        0AD1: show_formatted_text_highpriority "Car velocity: %.3f" time 2000 4@          end jump @velocity

[SilentPL]

Not sure if it will be the fastest way, but:
Read CPlayerPed pointer from CPlayerInfo.pPed, which comes always at 0xB7CD98. Then, as Bad.boy said, read CVehile pointer from CPed.pVehicle, which comes at CPed + 0x58C. Then, if you want to do it in real R* style, you have to use some checks - Rockstar gets the entity position by:
1. Reading CMatrix pointer from CPlaceable structure (which is the 3rd level of CVehicle parent), which in your case comes at CVehicle + 0x14.
2. Then, they check if pointer isn't NULL. If it isn't null, position is in CVector structure at CMatrix + 30h (the previous pointer you read). Otherwise, if it IS NULL, position is in CVector which comes at CVehicle + 0x4 member.

Confusing, but it turns out to be nice in well-structured piece of code.

[ikkentim]

QUOTE (SilentPL @ Thursday, May 10 2012, 18:35)

Not sure if it will be the fastest way, but: Read CPlayerPed pointer from CPlayerInfo.pPed, which comes always at 0xB7CD98. Then, as Bad.boy said, read CVehile pointer from CPed.pVehicle, which comes at CPed + 0x58C. Then, if you want to do it in real R* style, you have to use some checks - Rockstar gets the entity position by: 1. Reading CMatrix pointer from CPlaceable structure (which is the 3rd level of CVehicle parent), which in your case comes at CVehicle + 0x14. 2. Then, they check if pointer isn't NULL. If it isn't null, position is in CVector structure at CMatrix + 30h (the previous pointer you read). Otherwise, if it IS NULL, position is in CVector which comes at CVehicle + 0x4 member. Confusing, but it turns out to be nice in well-structured piece of code.

Could you tell me what CMatrix' structure looks like?
As i did all what you said, it looks like a pointer to the CMatrix' address,
but do I need to add something to get the info I need (posX,Y,Z)?

EDIT: Got It! Needed to add 48! Thank you so so much!

This post has been edited by ikkentim on Thursday, May 10 2012, 20:48