How Will Polyphony Digital Pull Off Graphics and Dynamic weather on PS4

How will GT7 run on Ps4!


  • Total voters
    108
515
Canada
montreal,quebec,canada
Like i and some other members here may remember I had start a Discussion way back when GT Sport its it rain update almost after 1 year after Lunch [How Did Polyphony Digital Pull Off The Rain Effects]
at this point most of us Agreed that GT sport was at the limits of the ps4 & ps4 pro.

This week what the new GT7 Trailer we have got Confirmation that it will be Cross gen and ps4 will get a Copy of the game.

the Question I ask how will they make it work if GT sport was all reday at the limits of the old hardware???

Also
How will we get track With dynamic weather when in GT sport it was not done because it was said to have made frame rates Unstable from its 60FPS ???

 

LeGeNd-1

Premium
6,805
Australia
Australia
GTP_LeGeNd-1
30 FPS like Driveclub is my guess. I'd much prefer a lower but stable framerate rather than unstable 60 FPS.

PCARS2 and ACC also has dynamic time/weather but I'm not sure what FPS those games run on consoles since I have both on PC.
 
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140
Mexico
Mexico
I think GT Sport looks awesome, but is not the limit of PS4.

They just work more with the hardware and PD engine.
 
38,461
Australia
The Bronx
I know more than one thing, the day/night transition at Tokyo Expressway SOL, will look awesome.
 

TonyJZX

(Banned)
3,945
Australia
Australia
GT5/6 style = 45fps

i dont think we live in a universe where 30 fps is acceptable to them

if the ps3 can do it why cant ps4?
 
459
Brazil
Pelotas
wagnerFAM98
Just watch PD manage to make GT7 run on base PS4 just like GT Sport runs there, no worse than it. Seems crazy, I know, but like someone once said on these threads a while ago, the guys from Polyphony are "hardware wizards", they manage to do things we feel it's almost impossible.
 

MikeV27

Premium
2,878
Canada
Kirkland Lake, Ontario.
MikeV27
As long as the lighting is “baked in” like GTS, then it should be ok. I’m skeptical about the weather though, will it go from dry to wet in a race like the F1 games? I doubt it but I hope I’m wrong.
 
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As it is worded, I'm not really sure the time / weather "change" is intended to be dynamic, even on PS5.

What really bugs me is how the humidity indicator changes progressively from 100% to 0%, and not instantaneously, when they are two unrelated scenes on different tracks.
 
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1,541
vspectra06
vspectra06
As it is worded, I'm not really sure the time / weather "change" is intended to be dynamic, even on PS5.

What really bugs me is how the humidity indicator changes progressively from 100% to 0%, and not instantaneously, when they are two unrelated scenes on different tracks.
Yeah we'll never know for certain until the game is in our hands or PD shows a timelapse of a race, but it would be weird to call this a "simulation" of any kind if it was just a bunch of preset static choices to choose from like in GTSport. And they've shown the dynamic time change during this trailer and volumetric cloud/weather in the first trailer on the race track.

"Time/Weather Change Simulations​

The time/weather change simulation brought to life in GT7 is unique to Polyphony Digital, who researched the complexities of nature and tailored it into a video game. Referencing a massive amount of meteorological observation data, we have recreated spatial / time of day conditions for particle size distribution and concentration distribution of aerosol particles in the atmosphere on a global environmental scale, in a procedure that is unique to the Gran Turismo series.

The validity of the simulation was checked using Scapes HDR images, for which we have accumulated data for several thousand spots all around the world. As a result, we have succeeded in expressing real and complex skyscapes and changes in light for different times of day and weather."

 
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764
Philippines
Philippines
I don't care how it performs on the PS4 version, I'm just glad we actually have the dynamic features back on top of volumetric 3d cloud simulation and they didn't exclude it from the PS5 version for the PS4 performance sake.

Would love to see some track surface simulation but they didn't mention anything about it, so I guess there's no point expecting it. I could be wrong though.
 
428
United States
United States
I don't care how it performs on the PS4 version, I'm just glad we actually have the dynamic features back on top of volumetric 3d cloud simulation and they didn't exclude it from the PS5 version for the PS4 performance sake.

The real cloud simulator


Looks pretty cool, I wonder what this means for the skyboxes they used in GTS. There was the Willow Springs Lambo shot that still used an old skybox so maybe they will use a mix of static/dynamic

But happy to see the stars are back.
 
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20
United States
California
platymusPrime
There's a short clip in the trailer at 2:20 that shows surface wetness going from 100% to 93% at the Tsukuba Circuit (there's a new meter on the HUD to the left of the tire status). I'm hoping this is a sign of true Dynamic Weather, but it also could just be predetermined variations in wetness and grip levels in different patches around the track.
 

regnar

Senior Member
Premium
1,376
United States
Florida, USA
red95gts
Desman1982
Hard to imagine there would be no compromises on the PS4, reduced grid sizes I suspect would be the obvious first choice.
 
1,212
Serbia
Serbia
Warlock__SRB
There will be difference in lighting, ...if PD doesn't pull something like loading AO, textures, baked shadows etc for time pass and/or dynamic weather...
If they change lighting, then game shouldn't be much bigger then it already is (talking about GTS with current content, not new GT7), but if they go for additional textures, baked shadows, AO etc, then one can expect a lot bigger game files, and game in general will take much more space on old gen consoles...

Regarding FPS, I don't see need for it to be changed if latter is going to be used, maybe there will be frame drop here and there while loading new assets, ...maybe even without frame drops can this be done, with some minor graphic optimizations for less stress on loading...
If they decide to use different lighting, aka fully dynamic with all calculations, I do expect FPS to drop a lot, probably we'll see game running at 30FPS, which I don't mind TBH...

There is also another question, will GT7 be using FSR, I expect it to use dynamic FSR on both PS4 and PS4Pro, with lowest settings at Quality, aka 720p (1080p FSR) for PS4 and 960p for PS4Pro (1440p FSR, and then upscaled to 4k). Would make sense using this, since avg FPS boost on this settings is approx up to 20-30%, which means, old gen consoles could get 2x more power regarding FPS drop, from 60 to 30, and additional 20-30% for FSR usage (this is scenario on GTS), which would get it up to avg 2.5x render capability (again talking for GTS with 30FPS and FSR on Quality vs current 60FPS and no FSR).

Also there is this, will they keep same amount of cars? 16-24?!? In GTS there was multiclass SP event with Gr4 and Gr3 cars on Maggiore (I think we drove 911 RSR for an hour as a license test), and game was running just fine 30 cars on track, and considering console needs to do the thinking for 29 cars and physics for 30 cars, instead only physics when running MP game (although not sure if AI thinking is that much of additional CPU cost in GTS)... There were few teases for GT7 where multiple class cars are seen in same race, especially outro in newest gamplay/trailer reveal, where Gr3 and Gr4 cars were driven on LeMans (24h of Le Mans maybe)...
If they keep GFX settings same as in GTS for GT7 on PS4 and PS4Pro, with above mentioned FSR and FPS drop, one can hope for good looking game (with unnoticeable shimmering due to the FSR) and possibility to run much more cars on track with dynamic weather and day/night... And as I said, only drawback is FPS on 30, which again, I don't mind for old gen consoles.

And then there is this, most modern games use effects to mirror (trace) objects in mirrors, windows, puddles etc. GTS, well, PD in general is always a bit different, they for example use inverted geometry attached to current geometry in order to render mirrored objects, for example interior cockpit of the car on windshield, track reflections in puddles etc. So apparently it is more cost effective using it this way, so I presume they will degrade those reflective objects in order to squeeze few frames here and there on old gen, where on PS5 they've could use RayTracing for this.

Now regarding cars, in general, frame time, memory available etc is always same problem for most game developers. I myself did a lot of mods for Assetto Corsa, and there was one rule for car mods, folder of a modded car needs to be max 50MB heavy unpacked. AC (original game) in general uses approx 50MB car files, so everything when loaded for single car is 50MB of VRAM memory, and game alone was meant for 22-26 cars per track, and with all settings bumped up, it should use up to 3GB of VRAM, so I did a lot of experimenting, and basically I managed to run N24 with 100 AI cars and all together it used approx 7.5GB of VRAM...
So, I am not sure how much RAM uses a car or a track in GTS/GT7, but I am sure it has similar analogy. Also I don't know what is the amount of RAM that game uses on PS4/PS4Pro, but there is for sure room for more.
And, now that I mentioned AC, in AC every car has multiple predefined LODs, they take up space, and are loaded dynamically, in GTS, there is only one LOD per car, and sort of tessellation algorithm bumps details up or down depending of distance from camera (asked details of car model). Not sure how much CPU/GPU time it takes TBH, but it is for sure more intensive then predefined LODs.

All in all, I think game will run just fine on old gen consoles, and PS5 won't suffer anything regarding GT7 releasing on old gen, this is my opinion...
 
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125
United Kingdom
United Kingdom
It sounds good that PD are implementing dynamic weather into the PS4 version, but I reckon the graphics will be downgraded to balance out the performance.

When they added that basic weather system on certain tracks in GT Sport, some of them just looked off, like it was graphically lower quality.
 
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