Function hazeField

hazeField(x: number, y: number, time: number, seed: number): number
A deterministic wisp field in 0..1: two octaves of value noise over an integer lattice, smoothstep-interpolated so neighbouring samples always blend rather than step. Pure and seed-stable within a run: the same (x, y, time, seed) paints the same wisp, which is what makes haze testable as arithmetic instead of eyeballed as weather. Time wanders the lookup along a slow breeze, so a still coordinate still breathes.
Parameters
- x: number
- y: number
- time: number
- seed: number
Returns number
Example
```
import { hazeField } from '@datamoc/mwg/two-d/render';

console.log(hazeField(3, 5, 1.5, 7) === hazeField(3, 5, 1.5, 7)); // true - same sky twice
console.log(hazeField(3, 5, 1.5, 7) >= 0 && hazeField(3, 5, 1.5, 7) <= 1); // true - always a density
```
- Defined in src/two-d/render/HazeLayer.ts:41