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

Ladders — page 8

A field says what an essay is about. A ladder says what else there is to say about it — the distinct arguments that stand against one idea, from the one that introduces it to the one that assumes all the others.
midpoint — 2.77 mm gapfrom the left eyefrom the right eyegap 2.77 mm at 7.22 mexact marks: 2.2e-16 m

Triangulation

  1. 1 Two rays that do not meet
1 rung · depth correct from 19 cm, at 160 mm wideratio 1.2509 · carries one onto the other to 1e-15 m

Twolamps

  1. 3 Two lamps and one map
1 rung · light horizon — the image of the line at infinityvanishing point at x = 1464 — off the framecorrect from 26 cm, at 160 mm wide34° across

Vanishing

  1. 1 Where parallel lines meet
1 rung · foundations barrel vaulteye · 1.62 mon the floor1e-12 mmon the vault529.4 mmworst miss of the best homography, log scalevault radius 4.0 m7.7% of the extent, against 4e-14%

Vaultanamorph

  1. 4 The ceiling that is not a plane
1 rung · viewing one pixel is an areacentrescornersprincipal point moves0.707 pxfocal length changes by4.5e-13 pxan edge-versus-centre viewport1.303 pxa half-pixel convention is a principal-point error; an off-by-one viewport is a focal-length error8 vertices, all shifted by the same 0.7071 pxspread across marks 0.0e+0 px

Viewport

  1. 1 A pixel is not a point
1 rung · pipeline hull 3.1098 · object 2.9193 · floor 3.07498 outlinesthe notch survives all of them

Visualhull

  1. 4 The dish no outline reaches
1 rung · metrology the eye the design is forthe cameracorrect from 14 cm, at 160 mm widerecovered to 2.5e-14 m

Wallrecovery

  1. 5 The wall under the paint
1 rung · metrology 54 px69 px84° across27% wider at the edge

Widefield

  1. 3 Wide angle is not distortion
1 rung · viewing

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