The PS logo on the cdrom? That is displayed as raw TMD without any TIM bitmaps. And the console will treat the disc as unlicensed and won't boot the game if you edit a single byte in that TMD file (unless you want to make or buy an expansion rom cartridge to bypass that license check). Yes I meant ...

Who or what is supposed to display TMD files when launching what? TMD files contain models. TIM files contain bitmaps. If you want to use a TMD to display a bitmap, then the TMD model would need to contain a single rectangle/polygon, with the corresponding bitmap being stored in a separate TIM file...

Hello, I was wondering if there's a simple way (or even a tutorial) on how to convert a picture into a TMD file (so i can set a custom flat logo on launch)
Is that possible? Or does it have to be a 3D object?

PS: I have very little 3D modelling experience.