To the human eye, a piece of white paper seen in shadow will not appear to have the same hue as one seen in sunshine. Therefore the RGB spectrum is not sufficient to define a color because it lacks intensity information.

This intensity (High Dynamic Range or HDR) is the sensation of being dazzled and affects our retinas which force dilation so as to adapt to a very bright or very dark environment.

This effect, which is indispensable for realism, is integrated into Twinmotion®2 and works in real time, just like the human eye.