Magical gene / ground and strong white

Opal Wing-Vein Marking

The barrel as an insect wing - a membrane running dark at the belly to bright along the back, fanned with fine veins and lit between them.

What it can come out as

Outcome	Carrying
Opal Wing-Vein Marking	`Owv/Owv` · `Owv/Owm` · `Owv/n`
Opal Wing-Vein, muted	`Owm/Owm`
Wild type	`Owm/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 3,571 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
`Owv/Owv`	Opal Wing-Vein Marking	0.001% — 1 in 100,000
`Owv/Owm`	Opal Wing-Vein Marking	0.004% — 1 in 25,000
`Owv/n`	Opal Wing-Vein Marking	0.019% — 1 in 5,263
`Owm/Owm`	Opal Wing-Vein, muted	0.004% — 1 in 25,000
`n/n`	Wild type	99.972%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/opal_wing_veins.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.opal_wing_veins`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	225 — where it sits in the one `(priority, key)` paint order
Alleles	`Owv` · `Owm` · `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	PARTS, RAMP, 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.

Opal Wing-Vein Marking

The membrane is a RAMP up the horse rather than a mask, so it fades nowhere and covers everything. The veins are a repeated saw band with a small amplitude, which makes them fan rather than run parallel; the glow is the same mask inverted, so the lit membrane is exactly what the veins are not.

the wing membrane, dark below and bright along the back — PARTS, painted with RAMP
the veins themselves — WAVES, painted with TOWARD
and the membrane between them lit from behind — WAVES inverted, painted with TOWARD

Opal Wing-Vein, muted

The same wing with the glow between the veins turned right down, so it reads as a veined coat rather than as a lit membrane. Fully recessive.

the wing membrane, dark below and bright along the back — PARTS, painted with RAMP
the veins themselves — WAVES, painted with TOWARD
and the membrane between them lit from behind — WAVES inverted, painted with TOWARD

Wild type

No veins.

Paints nothing.