GT4 1080i

I think GT4's 1080i mode is just a close-to-normal resolution which is being field rendered (half-resolution images getting interlaced together in alternating screen updates) to 1080 horizontal scanlines.

It's more of a thoughtful alternative for users to have than an impressive technical feat, and whether it even looks better than 480p can be a matter of taste.

The challenge of providing proscan is mostly just programming the mode and set-up options in the game. Dreamcast made this easier because it outputted both the proscan and interlaced signals simultaneously, so support was ready-made. A small percentage of PS2 games -- several high profile ones, though -- use field rendering, and those can't natively support proscan at all.

 

I think there's more horizontal resolution or else your TV wouldn't be able to display it.

I like GT4's 1080i mode. It's probably the cleanest looking PS2 game I own I wish more PS2 games would support it.

 

On my tv the "1080i" mode looks noticeable better than 480p, but the difference isn't nearly as big as 480i vs 480p, screen size is 61"

 

As Lazy8s pointed out, 1080i mode is field-rendered in GT4, so only 540 lines per field are required for a 1080 signal. The horizontal resolution is doubled.

 

Maybe because, believe it or not, GT4 doesn't really push the PS2 hardware as much as other games?
Ans also because they might have had more time to think this out and implement it, they were working on the game for bloody ages after all....
These days, it seems that "good enough" is the norm, and 480i/p is "good enough". 1080i is one of those features the developers probably wanted to include to prove something in technical terms, rather than anything particularly useful to the end user.

 

I think it's less of an issue with how demanding the game is as a whole, but rather that the implementation must be supported and thought through from the beginning. The buffer is also a bit larger (640x540 vs 640x~480), reducing the amount of VRAM available.

Also, I'm not quite sure if the horizontal resolution of the frontbuffer is actually 640, 1280 or in fact 1920. Even a 640 horizontal width should be a correct 1080i signal and then upscaled on TVs to fit the resolution...

All in all, a very neat "hack" that at least gives you double the vertical resolution.

 

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I think useful for HDTV owner and also for advertising purpose because purchasers idea of HD even if they do not have HD because they feel it is more "high-tech" so they feel game with HD is also more advanced.

 

So why didnt devs support progressive for those games?

 

Because progressive scan and HD TVs were uncommon for most of the PS2's life. So optimizing, testing, and supporting exotic output modes wasn't exactly a high priority for most developers.

 

Then why did both the gamecube and xbox support it much more widely? As i understand, its not a hardware limitation to the PS2 for most of its games not outputting progressive?
Or is it maybe that PS2 games runt at a lower resolution, i mean the backbuffer?

 

Am I wrong or did GT4 have some leftover cars from PS1 just with filtering applied? Kinda how Gt5 had ps2 model cars?

Tbh I think @London-boy may be right, the GT games have never impressed me that much not even sport. Sure GT on PS looked better than N64's offerings for most of the gen but that's because no one gave a shit until World driver championship.

 

Was just comparing Forza on xbox and GT4 on PS2, both look nice, and different, Forza is technically much nicer looking, GT4 has better 'realism' to it. Hard to explain
GT4 does shimmer, very much so. But im playing with an RGB cable, wonder if its 480p or 1080i mode reduces this. Cant believe they released it like this.... After playing awhile, one gets used to it, and the graphics are really nice, but going back to Forza then i realize how bad it is.

The only video i can find regarding Forza and GT4, think its from IGN.



Edit:

GT Sport on PS4 looks better to me then Forza on X one though.

 

GT4 also runs at a higher framerate than Forza on OG Xbox. 60 is the target on GT4 (it drops some frames at 1080i, never noticed it at 480i, never really played it in 480p), Forza is 30 FPS. Also, Xbox has mipmaps, so less shimmering.

 

Rallisport challenge 2 has forza beat at 60fps no less.

Gamecube really got the shaft when it came to realistic racers though the best looking one I think is pro rally and that's a 2002 enhanced ps2 port but it's pretty nice looking, considering. And at 60fps