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The GTPSP intro didn't have to be based on any game engine. The entire thing could have been pure CGI based off of whatever assets PD had when they were putting it together.Theory 1 - The GTPSP Intro Snapshot
In the intro for GTPSP, some of the sequences, especially in the beginning, are rendered with far too much detail for the PSP to be able to handle. This suggests that those parts were made with a more powerfull, advanced engine: GT5, and using GT5 models aswell.
There were a few cars in GT3 and the various Prologue games that never crossed over to GT4. Just saying.Theory 2 - Are all Standards from past GT titles?(this one can give a tremendous headache)
As you know, a lot of the Standard cars will be returns of classics and favorites from past itinerations of Gran Turismo. However, are they all cars from previous games? What makes me put this question is the following set of thoughts: GT5 will feature 800 standard cars in total. It is unlikely those cars will come from games earlier that GT4.
No matter how you look at it, the hard numbers given by PD don't add up. Even if the GT5 Standard list is the worst case scenario (the idiotic GTPSP list, and the Premium and Standard lists share cars) it wouldn't work, because PD would presumably be reintroducing (most of) the cars from GT4 that weren't in GTPSP (like the Astons, for example).This means the cars we will be seeing as Standard are coming from GT4 and GTPSP. GTPSP's car list consists of 800 cars with all the cars from GT4 present as part of it, suggesting that the premium cars (modelled completely from scratch for GT5) would be those not seen on GTPSP, and those that are on GTPSP are made standards. This is not the case however, since cars (present in GTPSP) like the Ferrari Enzo, Bugatti Veyron and even others from older times like the Capuccino, Castrol Tom's Supra, Acura NSX, Skyline R34 etc..., have all been converted to Premium level. What comes out of this is that there is some space left in the Standard car count to reach 800.
This is already likely going to be a problem regardless of whether PD attempts to pad the numbers with purpose-built standards or not, because of the graphical differences between GT3 and GT4.More than that, in order to avoid further class division among the cars (like the creation of a High-Standard type) PD would have to update their older models to match these new Standard models they've just built, therefore emplying and improved quality on the exterior of all Standard cars.
One thing I remembered recently that I would like PD to implement (but they probably won't) would be the Nike One 2022 from GT4. The discussion with Phil Frank said that PD had the car modeled quite close close to his initial design and had to cut it down substantially in detail to even get it to work in the 1 on 1 races properly. The Toyota Triathalon car was presumably the same way.