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Watch On The video above showcases just how insane this mod really is. It starts with CJ on Grove Street in San Andreas shooting at NPCs in different parts of the game (The Strip). Then, he moves toward the pink portal, shoots at NPCs once again, and just casually goes through it to end up in GTA Vice City as Tommy Vercetti. He wreaks havoc, walks back to the portal, and crosses through to Vice City as CJ, only to go to GTA III and repeat the same thing there.
The craziest part is how these portals genuinely act as windows to another world where you can stand in one game and shoot inside the other one. It's unclear whether there's a limit to the level of interaction, like if you can't drive cars through them, but it's impressive, nonetheless. The video also shows how you can place these portals anywhere in the world in any of the three games yourself.
All of this begs the question: how? The modder explains that all three games are running simultaneously inside one process, sharing one Direct3D device. Each portal is a live GPU texture; there's no video capture to fake the realism, and the transition to each game happens in real-time via an engine swap. When you walk through a portal, it simply switches to that game's engine while the others keep running in the background.
(Image credit: Dryxio on YouTube) (Image credit: Dryxio on YouTube) Image 1 of 2 View Original
Each game and its world retain full native functionality such as its own AI, traffic, physics, saves, missions, and even settings. There's no loading screen when you use the portals either; you enter the world on the other side instantly, just the way you saw it before going through. This is largely possible because the source code of each game has been reverse-engineered and recompiled using an open-source engine.
GTA 3 and Vice City are now playable inside San Andreas
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Reference reading
- https://www.tomshardware.com/video-games/pc-gaming/SPONSORED_LINK_URL
- https://www.tomshardware.com/video-games/pc-gaming/ambitious-modder-creates-grand-theft-auto-multiverse-with-real-time-portals-san-andreas-vice-city-and-gta-iii-all-run-simultaneously-with-cross-game-interactions#main
- https://www.tomshardware.com/membership
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