I play tetris too (hkgwife)

Race #19478

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Official speed 127.48 wpm (30.50 seconds elapsed during race)
Race Start July 8, 2019 5:16:47am UTC
Race Finish July 8, 2019 5:17:17am UTC
Outcome Win (1 of 3)
Opponents 2. kazmor (82.96 wpm)
3. foobird (81.97 wpm)
Accuracy 99.0%
Points 131.72
Text #3622413 (Length: 324 characters)

The observed brightness of a Lambertian surface may be written as the product of an albedo factor, p, and the cosine of the incident angle, cos i. This means that brightness can be written as a product of a term that depends on the material, p, and a term that depends on surface direction, which in turn depends on f and g.