Smoothstep isn’t that great for AA… X axis is distance to edge; Y axis is area of pixel covered. Blue = true area, green = smoothstep.pic.twitter.com/z5rZVIbwyH
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Also as Gupta & Sproull pointed out in the 80s area *is* a function of distance if you treat pixels as circles.
Indeed, but simple distance doesn’t match trapezoidal area calculations — and you get visible artefacts with fine diagonal strokes.
It’s a max 3% difference.
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