Magical gene / spots and rings

Polymoon

A chain of pale disks running from the underside of the throat back along the shoulder and onto the barrel, largest in the middle of its run and tapering to nothing at both ends.

What it can come out as

Outcome	Carrying
Polymoon	`Pmn/Pmn` · `Pmn/Pmc` · `Pmn/n`
Coloured Polymoon	`Pmc/Pmc`
Wild type	`Pmc/n` · `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 1,786 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
`Pmn/Pmn`	Polymoon	0.002% — 1 in 50,000
`Pmn/Pmc`	Polymoon	0.008% — 1 in 12,500
`Pmn/n`	Polymoon	0.038% — 1 in 2,632
`Pmc/Pmc`	Coloured Polymoon	0.008% — 1 in 12,500
`n/n`	Wild type	99.944%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/polymoon.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.polymoon`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	307 — where it sits in the one `(priority, key)` paint order
Alleles	`Pmn` · `Pmc` · `n`
Varies per horse	6 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	AXIS, SPOTS, TOWARD, WAVES

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.

Polymoon

Circular disks laid nearly edge to edge along one curved path, sometimes overlapping a little, never scattered and never in two places. The path leaves the underside of the throat, runs back through the point of the shoulder and out along the side of the barrel, rising and falling in one smooth curve. The disks are largest along the shoulder and the barrel and taper away to almost nothing at both ends of the run, so the chain reads as a thing with a beginning and an end rather than as a row.

the chain, tapering out tiny at the throat and on the barrel — SPOTS × WAVES × AXIS, painted with TOWARD
the large moons along the shoulder and barrel — SPOTS × WAVES × AXIS, painted with TOWARD

Coloured Polymoon

The same marking in a colour the line carries rather than in white. Fully recessive: it takes two copies, and a single copy beside the white allele shows white. It never gives blue eyes, whatever the white form does.

the chain, tapering out tiny at the throat and on the barrel, in colour — SPOTS × WAVES × AXIS, painted with TOWARD
the large moons along the shoulder and barrel, in colour — SPOTS × WAVES × AXIS, painted with TOWARD

Wild type

No chain.

Paints nothing.