lets supose you are in virtul reality in a 500th story of a 1000 stories skyscraper and you look in front of you to a twin skyscraper if you pan from the top to the bottom of the skyscrapper infront of you can happen two things:
if you look with plane screen to the straight vertical lines that make the skyscrapper as you pan down youll see the lines rotate and go from cutting in the top when you are looking up to cutting in the bottom when you look down, so this lines have rotated
but if you are in the middle of a spheric screen the top of the skyscrapper will be almost in the north pole of the sphere and the bottom in the south
now the straight lines that form the skyscrapper are two meridians of the sphere
the advantage with the spheric screen is that straight lines dont rotate as you pan as happens in the plane screen
this oddity of seeing from the center of a spher two meridians as straight lines that cut both in bottom and top relates with the 4th axiom of maths of two paralel lines never cutting which remained wrong for 24 centuries until the appearance of euclidean geometry
on the other hand for spheric vr you would need two images one for each eye and to double size of images when halving distance to screen to keep the feeling of looking through a window like tintin in trip to the moon with his transparent helmet that in this case would be a screen
if you look with plane screen to the straight vertical lines that make the skyscrapper as you pan down youll see the lines rotate and go from cutting in the top when you are looking up to cutting in the bottom when you look down, so this lines have rotated
but if you are in the middle of a spheric screen the top of the skyscrapper will be almost in the north pole of the sphere and the bottom in the south
now the straight lines that form the skyscrapper are two meridians of the sphere
the advantage with the spheric screen is that straight lines dont rotate as you pan as happens in the plane screen
this oddity of seeing from the center of a spher two meridians as straight lines that cut both in bottom and top relates with the 4th axiom of maths of two paralel lines never cutting which remained wrong for 24 centuries until the appearance of euclidean geometry
on the other hand for spheric vr you would need two images one for each eye and to double size of images when halving distance to screen to keep the feeling of looking through a window like tintin in trip to the moon with his transparent helmet that in this case would be a screen
