re3 is an ambitious port of the 3d era GTA engines. Recently, it hit major milestones and now GTA3 and Vice City are fully playable with some additional features. You may ask, why GTA needs a new engine. Well, there is no "best" version of the game, all versions have some issues, changes, censorship or broken features, or some limits of customizable options, etc. I will not go on a huge wall of text about all of it, but from what I see, this engine might be a new defined way to play these games and will help preserve them in the future.
There is the official list of new features
We have implemented a number of changes and improvements to the original game. They can be configured in core/config.h. Some of them can be toggled at runtime, some cannot.
- Fixed a lot of smaller and bigger bugs
- User files (saves and settings) stored in GTA root directory
- Settings stored in re3.ini file instead of gta3.set
- Debug menu to do and change various things (Ctrl-M to open)
- Debug camera (Ctrl-B to toggle)
- Rotatable camera
- XInput controller support (Windows)
- No loading screens between islands ("map memory usage" in menu)
- Skinned ped support (models from Xbox or Mobile)
- Rendering
- Widescreen support (properly scaled HUD, Menu and FOV)
- PS2 MatFX (vehicle reflections)
- PS2 alpha test (better rendering of transparency)
- PS2 particles
- Xbox vehicle rendering
- Xbox world lightmap rendering (needs Xbox map)
- Xbox ped rim light
- Xbox screen rain droplets
- More customizable colourfilter
- Menu
- Map
- More options
- Controller configuration menu
- ...
- Can load DFFs and TXDs from other platforms, possibly with a performance penalty
- ...
Mods that make changes to the code (dll/asi, CLEO, limit adjusters) will not work. Some things these mods do are already implemented in re3 (much of SkyGFX, GInput, SilentPatch, Widescreen fix), others can easily be achieved (increasing limis, see config.h), others will simply have to be rewritten and integrated into the code directly. Sorry for the inconvenience.
They want to support more "3d era" GTA games in the future