Reveal

Pointer-tracked image reveal. Image filter from Paper.

A small detail: the edge eases toward the pointer using linear interpolation, so it lags slightly behind—like pulling a curtain with some conceptual weight. Also, check the use of mix-blend-mode: multiply along the frame’s edge.

{
  "current": 30,
  "target": 30,
  "reveal": 30,
  "factor": 0.12
}