Magical gene / fields and regions

Nimbus

A small dense knot of colour on the trunk inside a much larger haze you can read the coat through, with a few faint tangents straggling onto the legs and face and no edge anywhere.

What it can come out as

Outcome	Carrying
Nimbus	`Nim/Nim` · `Nim/n`
Wild type	`n/n`

How each one is actually drawn - region by region, and the layers it is built from - is on the coding tab.

Crossing two of them

Finding one

About 1 in 833 wild horses is born showing this. That is the whole of the supply: catch one, or make one with the carrot below. Breeds set their own pools and a breed built around this gene will carry it far more often than the wild population does.

Wild pair	Shows as	How often
`Nim/Nim`	Nimbus	0.006% — 1 in 16,667
`Nim/n`	Nimbus	0.114% — 1 in 877
`n/n`	Wild type	99.88%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/nimbus.json — a data-driven gene, not a Java class. It is listed in the index.json beside it and registered by Genes' class initialiser at startup.

Key	`horsegenetics.nimbus`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	262 — where it sits in the one `(priority, key)` paint order
Alleles	`Nim` · `n`
Varies per horse	3 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	AXIS, NOISE, STROKES, TOWARD

What it paints

Each outcome, described the way the gene file describes it, and then the layers that draw it in the order they are painted. The prose is the part a reader checks a bake against; the list underneath is what the engine actually did.

Nimbus

A cloud, and mostly a very faint one. The great majority of the marking is a haze you can read the coat straight through, spread over the trunk and trailing onto the head and the legs as a few straggling tangents rather than as a field. Somewhere on the barrel or the shoulder is the body of the cloud - a small dense knot, a hand's span or two across, where the colour actually arrives - and inside that the saturation curdles into stronger and weaker cells so the coat still reads through it in places. There is no boundary to find anywhere on any of it. The whole thing is turbulent: nothing about it repeats, and nothing about it lines up with the horse.

the haze - most of the marking, and nearly transparent — NOISE, painted with TOWARD
straggling tangents down the legs and across the face — STROKES × NOISE, painted with TOWARD
the body of the cloud, small and dense — NOISE × AXIS, painted with TOWARD
the curdle inside the body, where the saturation gathers — NOISE × NOISE, painted with TOWARD

Wild type

No cloud.

Paints nothing.