Visual Plane
every picture states the point it is correct from
Concept

Elevation — where it appears

2 essays name this object, across one field. What follows is each of them, and the objects they name alongside it.
fitted conic: 1.467 from being a circlecylinderthe samples, fitted

The cylinder, and the price of going all the way round

A cylindrical picture can hold three hundred and sixty degrees, keeps every vertical vertical, and bows every horizontal. Its cost is a stretch of sec φ in elevation, which is also the equirectangular surface's cost exactly — two surfaces that are always described as different and are identical in the one respect anybody notices.

curved · cylinder no picture at 300°the plane is unbounded at 180°plane — bend 0.0%cylinder — bend 6.0%stereographic — bend 3.5%equidistant — bend 4.5%equal-area — bend 5.1%equirect. — bend 5.7%300° across in every panelsame scene, same angle, six surfaces

What a 360-degree photograph actually is

The format every spherical camera writes preserves nothing — not straightness, not shape, not area — and it is the right choice anyway, for a reason that has nothing to do with looking at it. An equirectangular file is a lookup table of directions, and the picture only exists at the moment something re-projects a piece of it.

curved · panorama

Named alongside it

The objects these essays reach for when they reach for this one.

AzimuthEquirectangularAnisotropyArea scaleConicCylindrical projectionfield of viewFisheyeFocal lengthLight fieldPanoramare-projection

All concepts