Magical gene / fields and regions

Orchid Frost

Cold, soft-edged blotches settle over the coat, bleaching its black and plum toward candy pink wherever they land - and finding nothing to bite into on a coat already that pale.

What it can come out as

Outcome	Carrying
Orchid Frost	`Frs/Frs` · `Frs/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 2,500 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
`Frs/Frs`	Orchid Frost	0.002% — 1 in 50,000
`Frs/n`	Orchid Frost	0.038% — 1 in 2,632
`n/n`	Wild type	99.96%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/orchid_frost.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.orchid_frost`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	287 — where it sits in the one `(priority, key)` paint order
Alleles	`Frs` · `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	LUMA, PARTS, SPOTS, TOWARD

Why it is built this way

'no effect on a coat lighter than the pink' is not a region this gene excludes. It is the LUMA mask's coverage genuinely reaching zero once the resolved colour is as light as #f7a8c4 is. The blotches are still drawn there; there is simply nothing left for them to take. That is why the condition is written as a reading rather than as a parts list - a parts list could not know what colour a horse turned out.

One SPOTS field with a high 'vary' and a generous softness, not several. The reference's ellipses are wildly mixed in size and their edges sink into the surrounding colour rather than cutting it, and both of those are one field tuned loosely rather than a stack of tight ones.

Density and strength are both per-dose on the one expression: a single copy scatters sparse blotches at a little over half strength, two copies fill in. That is legal here because the two combinations this expression claims carry different numbers of copies - a per-dose value on an expression where they did not would be a constant with decoration, and the loader refuses it.

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.

Orchid Frost

Pale, soft-edged blotches spread over the coat, bleaching the darker parts toward pink and passing over anything already that light. Two copies frost it heavily; one leaves a scatter.

the frost — PARTS inverted × SPOTS × LUMA, painted with TOWARD

Wild type

Nothing.

Paints nothing.