Cheat Engine

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

I want to know how to find the memory addresses of the collision calculation in a game.

Example:
- you throw something into any other thing and these objects collide
- you drive in a racing game and two cars collide

How to find these addresses?

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5627

One method:

You need to find a code which is executed when the 2 cars will collide. For example a health decreasing code (if there is damage in the game). Then You have to backtrace the whole process to see what happened.

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5627

No, if You trace the process, it will slow down so You will not be able to play.
You need to be creative and think about something that is related to the car collision and You can find manually.

Like damage of the car for example. If You know what is changing the health, You can backtrace the process like this:

taking x damage -> calculating the damage -> what was damaging Your car -> how is the collision calculated

etc.

You need to know how to use the debugger and how to backtrace in the codes for this.

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5627

What You want to do is reverse-engineering the physics engine of the game. This means You need to work with mostly shared codes, with values that are accessed by tons of codes mostly thousands of times in a second.

You will have to be creative and You will also need some experience in debugging to mess with the physics of a game or an object. Not to mention that simulators obviously have a very complex physics engine as the whole game is about simulating real life physics.

First You need to figure out how is the engine working (at least approximately) and if You see the big picture and have at least a slight guess of what factors are affecting Your car speed/direction etc, then You can try to find how is the collision affecting the system.

This is certainly not the same as making an "unlimited health" cheat but much more complex. Changing the speed/weight/co-ordinates etc of the car or similar is not so difficult, but to change the game physics and simply turn off collision is far more complicated.
Many interesting stuff can be done with modifying Your car's data but You need to figure out how is the game working by Yourself.
For example if Your car's weight is like 80 tons, traffic lights will surely not slow it down but this will also mean that Your car will be slow or not start at all with its default engine as it wasn't designed for tanks.

The easiest solution would be if there is "invulnerability" in the game, where You have a few seconds when Your car is a "ghost" only. Most racing games have this effect when Your car is crashed and You are placed back on the road. Then all You need to do is find the timer which counts how much time do You have until Your invincibility will turn off.

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

wow, thank you for that very detailed information.

I think it will help me to find the things Iam looking for!
I already found car handling and movement indicators.

So i am already able to move the car without keyboard input.
(move, rotate, tilt, changing coordinates and height over ground)

Do you think it is possible to find the 'call' of physics engine
if i look what writes to the "movement" of the car?

I found values that show the movent speed of the car in direction north to south and east to west. These values changing every few milliseconds and
i can freeze them to any value to set an continuously moving in any direction.

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5627

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

Thank you for your quick and detailed answer!

I just tried put what i was thinking about, and i found a Instruction,
which gets called, when i hit objects. I will now look into it and hope
to find a way to stop that instruction without crashing the game.

I don't think my PC gets slowed down, because i have good system here.
- Intel Core i7 (quad with 2 threads for each core) @ 4,0 GHz
- 6 GB of RAM

But thank you for your information and warnings!

I just have some more questions:
- Does Cheat Engine have a debugger function like Olly Debug?
- So if i stop the game (pause) can i go through the code Step by Step?
- Can i 'step over' and 'step into' a call?

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5627

BinaryAbuse · Newbie cheater Reputation: 0 Joined: 04 Aug 2010 Posts: 19

Ok very nice information. That will help me very much.

Thank you for your good help!
I will search for the things now and Iam sure to find them, because you
gave me very usefull hints. Smile