This is the same as cutting the wrong pavilion refraction angle in the base of a gemstone. You end up with the table or the top of the gemstone acting as a porthole for seeing everything around just below it magnified in size. It's supposed to act as a pinpoint concentrator of refracted light which you see as sparkle.
Glass has a refractive index of 1.52 or 41°28'.
In the film the glass was set at 25°. Or you get a semi fish eye and magnifying effect, while eliminating the apparent real thickness of the glass sides. Hitech needs to know the angle that the thick armored glass is mounted relative to the windscreen. If it is less than 41°28', some amount of semi fish eye will be in play. To us that just means a little thinning of the uprights say like with the new C.202 and C.205. In the case of the glass in the film, about a 1\7 thinning. I don't think the optically magnified width of view can be recreated in a 2D world faking the illusion of 3D with pixels.
