| Parameter | Description |
|---|---|
| P | A point in 2D space. |
float2 Feature points. F1 is in the x component, F2 in the y component.
2D Cellular noise ("Worley noise") with a 2x2 search window.
Faster than using 3x3, at the expense of some strong pattern artifacts. F2 is often wrong and has sharp discontinuities. If you need a smooth F2, use the slower 3x3 version. F1 is sometimes wrong, too, but OK for most purposes.