density(x: number, z: number) → number

How thickly reed grows at a point: a band either side of the causeway, thinning out into open water, with slow noise so the beds have edges.

reedChunk(index: number, seed: number) → Geom

One band of reed. Returns the builder; the component uploads it.

hags(seed: number) → void

Peat hags: low islands of black mud with reed standing on them. They are what stops the open water reading as a swimming pool.

drift(seed: number) → Geom

Drift: broken piles standing out of the water at angles, sunk hurdles, floating planks. A fen is full of the wreck of the last causeway.

water( ) → Geom

The water: one wide plane, moved in Y by the component to follow the tide. Built at y = 0 in its own space, so the entity's transform IS the tide.

scum(seed: number) → Geom

Scum: the mats of weed, duckweed and peat-stain that lie on brackish water. Flat, matte and dark, they break the mirror — without them the fen reflects the whole sky back and reads as a sheet of glass at dusk rather than as water you would not want to fall into. They ride the water, so they are built in the water entity's own space, at y just above its plane.

bands( ) → void

The fog banks: wide, thin horizontal sheets lying over the water at different heights. Height fog gives the fen its depth; these give it the BANDING — the hard horizontal edges that make a marsh at dusk read as painted rather than as a gradient.

bandMesh(band: Band) → Geom

One fog band's geometry, at the origin of its own entity so the component can drift it in X and lift it with the tide.

profile(t: number) → number