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

Ladders — page 7

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.
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 54 px69 px84° across27% wider at the edge

Widefield

  1. 3 Wide angle is not distortion
1 rung · viewing 00.2500.5000.7501-10123distance from the eye — log₁₀ metresfraction of the buffer's codes used uphalf the codes by 0.20 ma linear map, for comparisonnear 0.1 m, far 1000 mharmonic mean 0.20 m against arithmetic 500 m

Zbuffer

  1. 1 The precision a depth buffer has left
1 rung · pipeline

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