4c gr4
CLK LM 98
R8 LMS Evo 19
R18 TDI 11
Bugatti VGT Gr1
GT by citron Road car
SRT Tomahawk X VGT
Viper Gr4
FXX K 14
Mark IV Race Car 67
NSX GrB Rally Car
NSX Gr4
NSX Gr3
NSX CONCEPT GT 16
XJR 9 88
RX500 70
Atenza Gr4
Atenza Gr3
650 GT3 15
Sauber Mercedes C9 89
RCZ GrB Rally Car
RCZ Gr3
908 HDi FAP 10
R.S01 GT3 16
BRZ GT300 21
V6 Escudo Pikes Peak Special 98
lol yeh VGT list could have been.
Some are obviously understandable but others ... I dunno
The majority of them are cars that either don't actually have a back window, Have a back window but its basically obscured by things such as the fire wall or roll cage (Or even the actual engine itself) or have simply a black piece that resembles a back window but its all black and can't be seen out of. Its not so much that all of these lack interiors as they actually are modelled, the view just isn't there because again of various aspects that make using the rear view from the interior impractical. I'll highlight the real cars just to give an idea since they exist and offer a solid basis.
In the case of these:
R18 TDI 11
XJR 9 88
Sauber Mercedes C9 89
908 HDi FAP 10
R.S01 GT3 16
These are all racing cars that have NO rear windows so the interiors are modelled but you'll never see them as attempting to use rear view from inside will show nothing but firewall.
In the case of these:
Bugatti VGT Gr1
GT by Citron Road car
FXX K 14
Mark IV Race Car 67
RX500 70
650 GT3 15
These kinda have rear windows or some sort of view out the back but because of either the firewall, the engine itself or both, its impractical as a means of using as a view to look back despite being fully modeled. You'll also notice the Bugatti VGT among these real car examples because its one of the very few VGT cars that do exist (and
actually functional too)
In the case of these:
CLK LM 98
NSX CONCEPT GT 16
BRZ GT300 21
These just have a fake rear window that is simply a cover that can be removed without removing the whole rear section for engineers to work on the internals of the car. Every single one of them has a firewall as well that once again makes trying to use the rear view from cockpit view useless so you definitely wouldn't be able to see out the back of these. Worth bringing the Escudo Pikes Peak Special here as well because despite taking on the silhouette of a production car with a engine in the front of the driver, its actually has its engine located behind the driver (As is the case with pretty much every Suzuki Pikes Peak car made by Monster Sport afterwards).
With these examples, they also can serve to explain many of the GR.3 and GR.4 cars since PD have modelled them based on some real life rules and machinery (For instance, the real life Acura/Honda NSX GT3 has just a fire wall on the interior so the GR.3 and GR.4 models as well as the GR.B have likely been modelled based on this, though the GR.3 interestingly uses a somewhat similar flat black rear cover in place of a window like the GT500 NSX does). As far as the majority of Vision GT cars go (and a few road cars), it seems to largely just depend on what cars as there appears to be no real consistency among them.