Coverage
The order pixels disappear in: a number per pixel from 0 (goes first) to 1 (goes last).
class Coverage
Import effects from shaders/std and use effects.reveal.Coverage.
Get one from a coverage word, then reshape it with the methods below. Each method returns a new coverage, so they chain. Pass the result to reveal.
Example
coverage: coverage.directional(p('angle')).folded()