Cheat Engine

mouser · Posted: Tue Oct 04, 2016 4:21 pm Post subject: How to handle movsd ?

What I usually do when looking for camera manipulation is something like this:

I find camera y, breakpoint on write and it looks like this:

Dark Byte · Posted: Tue Oct 04, 2016 4:28 pm Post subject:

movsd copies 4 bytes from esi to edi, and increases esi and edi with 4

3 movsd instructions will copy 16 bytes

mouser · Posted: Tue Oct 04, 2016 4:47 pm Post subject:

Hi Dark Byte, does that mean that when I intent to move the camera around that I have to use the edi register? How can I see the offset of edi (to get to xyz of the camera)? Or is there no offset because there is nothing defined after the instruction?
Then I don't understand how the camera is build here, I've never seen a game that builds its camera like this.

I mean this

Dark Byte · Posted: Tue Oct 04, 2016 4:57 pm Post subject:

read this:

mouser · Posted: Wed Oct 05, 2016 5:26 am Post subject:

Hm, I think I lack the knowledge/imagination to think through that or better: to think of a script that would make this workable in the way I want it to.

I instinctively want to target edi here in some form.

When you say

mgostIH · Posted: Wed Oct 05, 2016 6:16 am Post subject:

mouser · Posted: Wed Oct 05, 2016 2:07 pm Post subject:

I put a breakpoint on it and a break and trace (screenshot). This is the only way to see what is going on inside the movsd, right?

Or is it more complex than just looking at it that way? (I didn't check the value of cam Y but I believe I see it in the xmm0 register here, seems a bit too high though)

Is it better to inject somewhere else regardless to get control over the camera? I'm lacking the skills to even have an overview of what is happeng where at the movsd.