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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This is from a Monte Carlo simulation of randomly placed edges and calculating exact areas over a pixel square.
Tentative conclusion: Not worth calculating exact trapezoidal area coverage. Better to just use a polynomial approximation based on distance
Interesting. My simple geometrical analysis shows a huge difference between linear and diagonal.pic.twitter.com/yjJaIszjDO
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