Which reminds me that sunlight is not very realistic either.
I think that sunlight in Gran Turismo series should have much more photons inside visuals.
Even a blindman can see that number of photons represented in sunlight polygons is way beyond real.
For instance:
Thermal equilibrium requires that the energy density ρ(ν

of photons with frequency ν (which is proportional to their number density) is, on average, constant in time; hence, the rate at which photons of any particular frequency are emitted must equal the rate of absorbing them.[56]
Einstein began by postulating simple proportionality relations for the different reaction rates involved. In his model, the rate Rji for a system to absorb a photon of frequency ν and transition from a lower energy Ej to a higher energy Ei is proportional to the number Nj of atoms with energy Ej and to the energy density ρ(ν

of ambient photons with that frequency,
where Bji is the rate constant for absorption. For the reverse process, there are two possibilities: spontaneous emission of a photon, and a return to the lower-energy state that is initiated by the interaction with a passing photon. Following Einstein's approach, the corresponding rate Rij for the emission of photons of frequency ν and transition from a higher energy Ei to a lower energy Ej is
where Aij is the rate constant for emitting a photon spontaneously, and Bij is the rate constant for emitting it in response to ambient photons (induced or stimulated emission). In thermodynamic equilibrium, the number of atoms in state i and that of atoms in state j must, on average, be constant; hence, the rates Rji and Rij must be equal. Also, by arguments analogous to the derivation of Boltzmann statistics, the ratio of Ni and Nj is gi / gjexp(Ej − Ei) / kT), where gi,j are the degeneracy of the state i and that of j, respectively, Ei,j their energies, k the Boltzmann constant and T the system's temperature. From this, it is readily derived that giBij = gjBji and
The A and Bs are collectively known as the Einstein coefficients.
Somebody should really take that into concern, because I'm really intimidated how the sunlight representtion effects overall immerssion of the game.