Cheat Engine

deama1234 · Posted: Wed Jan 20, 2016 5:11 pm Post subject: Can't find the jump height

I can't seem to find the player's jump height value. I've searched for the Y-axis and found it, copied the value then jumped; just before the player started to fall down from the jump I managed to grab the new Y-axis and calculated the difference.

94.9999237

I've tried to search for that, or around that number; but I can't find anything.

The way I found that value is checking when the old value becomes higher than the new one, that means the player is falling. So once the player starts falling, it jumps to a label and saves the value into a custom symbol I made. I also tried to do it by estimation, and it was close to that one above.

Here's the instruction that gets executed about 5 times a second or so.

++METHOS · Posted: Wed Jan 20, 2016 5:20 pm Post subject:

Seems like an odd approach. I'm curious...has this worked before?

deama1234 · Posted: Wed Jan 20, 2016 5:46 pm Post subject:

++METHOS · Posted: Wed Jan 20, 2016 6:38 pm Post subject:

Games are made differently, so I don't rule much out.

Here is a good post explaining the most common scenario. Sometimes, a static value can easily be found inside one of the player structures. Other times, you may have to alter one of the forces dealing with jump or gravity...or just resort to altering your coordinate value that controls elevation (see below). Typically, if you can't find a static value, you're going to want to see what accesses your elevation axis and spend some time examining code and testing things out.

If all else fails, you can always write a script that will increase your elevation axis on key/button press. You can write it to automatically shoot/teleport you in to the air at a certain elevation, or, continually increase your height while button/key is pressed etc..

deama1234 · Posted: Thu Jan 21, 2016 10:41 am Post subject:

++METHOS · Posted: Thu Jan 21, 2016 3:30 pm Post subject:

deama1234 · Posted: Thu Jan 21, 2016 6:24 pm Post subject:

++METHOS · Posted: Thu Jan 21, 2016 7:45 pm Post subject:

By increment, it can still be fluid, not choppy. Also, I was referring to manipulating the Y axis (or Z, as some would say), not the jump value. If you can find what handles the jump, then great, but it's not always that easy since it's probably a static value.

Regarding assigning a button/key, there should be no problems with it. If you assign something that is already being used for something (such as a key that brings up a menu), then that is obviously not a good idea. Think of it this way...the game is constantly checking if your spacebar is being pressed or not...it's constantly reading the value that determines that. All you're going to do is read that value also, and if it's being pressed, then your bit of code gets executed also (in addition to anything else that may have been assigned to that key press).

If you cannot find the static value that handles jump, then analyze the code surrounding the instructions that handle your Y axis. One of them will have a check somewhere that determines maximum jump height...it may be a value that increases or decreases.

++METHOS · Posted: Sat Jan 23, 2016 4:17 am Post subject:

Here is a table that I just made for Jumpix Jump, just to give you an idea of one, crude way to do it. What this script does is check to see if spacebar is being pressed, if so, it temporarily nop's a function that handles your Y axis, allowing you to jump as high as you want. Once you release the spacebar, the function executes normally and you fall back to the ground.

I didn't take the time to clean this up, so it's very messy:

deama1234 · Posted: Sat Jan 23, 2016 8:19 am Post subject:

What if while your falling to the ground, the player presses the spacebar again? The player would either stop falling and hang there in mid air, or his height would increase; right?

++METHOS · Posted: Sat Jan 23, 2016 8:28 am Post subject:

In this case, if you press the spacebar again, whatever is happening during the moment that you press the spacebar again, will continue. So, if you happen to press the spacebar right at the moment when the player is not rising or falling, the player will just float in the air. If you press the button again while the player is falling, the player will continue to fall at whatever rate was seen at the moment of the key press.

You can write a script that will make the player keep going up, no matter what, though.

deama1234 · Posted: Sat Jan 23, 2016 6:15 pm Post subject:

Where do I get the Jumpix Jump game?

EDIT: Also, you don't use get async key, so I assume you managed to find the space jump boolean value?

++METHOS · Posted: Sat Jan 23, 2016 6:41 pm Post subject:

I just grabbed it from the web, strictly for this example.

No, I don't typically use that. But you can certainly do that here, as it would be a lot easier to implement. Just keep in mind that the calling conventions are different for x64 targets.