Iridescent Rosette

What it can come out as

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.

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/iridescent_rosette.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.

Why it is built this way

The import wrote the coloured form as one RAMP running RADIALLY out from each rosette's own centre. There is no radial axis on RAMP and adding one would need the op to know which cell it was in, so the three colour bands are written as three concentric SPOTS pairs instead - the same recipe the pale form uses, on the same seed, spacing, stretch and vary. The visible difference is that the bands step rather than blend; the registration, which is what the import was protecting, is exactly as tight.

Every radius here is a knob, and every band's outer edge is the next band's inner edge, so the rosette stays in proportion however the knobs are bred - and 'vary' scales the whole set of them by one per-cell factor, so a big rosette is big all the way through.

The pale form is the SAME three concentric bands as the coloured one, on the same radii and the same knobs, with the three hues replaced by three greys. It was a single flat ivory ring and read as a smudge at coat scale, because a ring with no interior structure has nothing to tell the eye where its edges are; three steps of grey give it the depth the coloured form gets from its hues, and keep the two forms recognisably the same marking.

The black allele is the white one with the light taken out of it, and it sits one rung under white in the dominance series - so every combination that existed before it keeps the outcome it had, and only the pairs carrying Irk are new. The re-toning is a mapping rather than a repaint: every achromatic target moves into the dark end of the scale keeping its order and its spacing, and every SATURATED one is left alone, because that colour is the gene rather than its lightness.

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.

Iridescent Rosette, pale

Ring-spots ghost the coat in three steps of grey - an almost-white outer band, a mid grey inside it and a near-charcoal ring round the hollow - the same size and spacing as the true rosettes with the colour taken out of the band.

1. the outer band, palest — PARTS × SPOTS × SPOTS, painted with TOWARD
2. a mid grey inside it — PARTS × SPOTS × SPOTS, painted with TOWARD
3. and the darkest grey round the hollow — PARTS × SPOTS × SPOTS, painted with TOWARD

Iridescent Rosette, black

The same marking as the white form with the light taken out of it: the same 3 steps, moved to the dark end of the scale.

1. the outer band, palest — PARTS × SPOTS × SPOTS, painted with TOWARD
2. a mid grey inside it — PARTS × SPOTS × SPOTS, painted with TOWARD
3. and the darkest grey round the hollow — PARTS × SPOTS × SPOTS, painted with TOWARD

Iridescent Rosette, coloured

Each rosette opens into a dark hollow ringed by green, then gold, then a wide band of magenta before the coat returns - a beetle-shell shimmer across the whole barrel.

1. the outer magenta band — PARTS × SPOTS × SPOTS, painted with TOWARD
2. the gold band inside it — PARTS × SPOTS × SPOTS, painted with TOWARD
3. and the green ring round the hollow — PARTS × SPOTS × SPOTS, painted with TOWARD

Wild type

Nothing.

Paints nothing.