Cheat Engine

[Fresco]

for example in a 3rd person game ... change the player character in to a box made in some 3d graphics program.
is that possible ?

[Dark Byte]

Yes, you just have to find out where the character is being rendered and replace his vertexbuffer with one of your own when drawn

(not easy)

[Fresco]

but what if i have the object extracted from the game ...
i could search for the hex value and then replace the entire code while the game is in break ... could that work ?

also i wanted to know ... is the render (3d object) stored in the "game.exe" process ?
or it just reads the "game core files" every once in a while ?

[Dark Byte]

No, once the object has been loaded in the videocard memory you can't change it that easily unless you change it at the beginning of the game before it is loaded (But you can load another model into video memory and then tell the gpu to render your model instead of the original)

The files get loaded into memory when they are needed. They are usually not located in the exe

[Fresco]

So you are saying that if a open "game.exe" in the "open process" list i will not find any bytes that holds 3d graphics? -So then where are those 3d files located

let's just say that i have my 3d model rendered in another 3d program and i have found the block of gpu of it (the model in the program) that i want to be renderd instead of my main character in game.exe --> i'm saying this because like music (mp3, ogg, etc) 3d files have also different formats ... and i suppose that in the gpu those formats are convenients (same format)

where exactly game.exe stores the files (in memory)?

and where exactly do i have to go to tell the gpu to render another model?

[Dark Byte]

You'll have to hook the direct3d rendering api. Not something you can quickly do with ce

[Fresco]

I assume that you know some tool like your "Cheat Engine" that'd be able to hook the direct3d rendering api.

[Dark Byte]

Cheat Engine does have a d3d hook routine but that's mainly to render extra stuff, not to replace existing models.

At most you could modify the sourcecode and do that but it's not easy finding the exact render command to replace the vertex buffer with that you want (tip: Check the stack)

[Fresco]